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Merge branch 'linus' into x86/urgent, to refresh the tree

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Ingo Molnar 2016-05-20 09:09:26 +02:00
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style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
id="tspan3029">(RCU Might Be OK...)</tspan></text>
<!-- Text -->
<text
xml:space="preserve"
x="7200"
y="7875"
font-style="normal"
font-weight="normal"
font-size="324"
id="text30"
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
sodipodi:linespacing="125%">(1) Provide Existence Guarantees For Update-Friendly Mechanisms</text>
<!-- Text -->
<text
xml:space="preserve"
x="7200"
y="8325"
font-style="normal"
font-weight="normal"
font-size="324"
id="text32"
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
sodipodi:linespacing="125%">(2) Provide Wait-Free Read-Side Primitives for Real-Time Use)</text>
<!-- Text -->
<text
xml:space="preserve"
x="7200"
y="7425"
font-style="normal"
font-weight="normal"
font-size="324"
id="text34"
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
sodipodi:linespacing="125%">(RCU is Very Unlikely to be the Right Tool For The Job, But it Can:</text>
</g>
</svg>
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939
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2741
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108
Documentation/RCU/Design/htmlqqz.sh
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@ -1,108 +0,0 @@
#!/bin/sh
#
# Usage: sh htmlqqz.sh file
#
# Extracts and converts quick quizzes in a proto-HTML document file.htmlx.
# Commands, all of which must be on a line by themselves:
#
# "<p>@@QQ@@": Start of a quick quiz.
# "<p>@@QQA@@": Start of a quick-quiz answer.
# "<p>@@QQE@@": End of a quick-quiz answer, and thus of the quick quiz.
# "<p>@@QQAL@@": Place to put quick-quiz answer list.
#
# Places the result in file.html.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, you can access it online at
# http://www.gnu.org/licenses/gpl-2.0.html.
#
# Copyright (c) 2013 Paul E. McKenney, IBM Corporation.
fn=$1
if test ! -r $fn.htmlx
then
echo "Error: $fn.htmlx unreadable."
exit 1
fi
echo "<!-- DO NOT HAND EDIT. -->" > $fn.html
echo "<!-- Instead, edit $fn.htmlx and run 'sh htmlqqz.sh $fn' -->" >> $fn.html
awk < $fn.htmlx >> $fn.html '
state == "" && $1 != "<p>@@QQ@@" && $1 != "<p>@@QQAL@@" {
print $0;
if ($0 ~ /^<p>@@QQ/)
print "Bad Quick Quiz command: " NR " (expected <p>@@QQ@@ or <p>@@QQAL@@)." > "/dev/stderr"
next;
}
state == "" && $1 == "<p>@@QQ@@" {
qqn++;
qqlineno = NR;
haveqq = 1;
state = "qq";
print "<p><a name=\"Quick Quiz " qqn "\"><b>Quick Quiz " qqn "</b>:</a>"
next;
}
state == "qq" && $1 != "<p>@@QQA@@" {
qq[qqn] = qq[qqn] $0 "\n";
print $0
if ($0 ~ /^<p>@@QQ/)
print "Bad Quick Quiz command: " NR ". (expected <p>@@QQA@@)" > "/dev/stderr"
next;
}
state == "qq" && $1 == "<p>@@QQA@@" {
state = "qqa";
print "<br><a href=\"#qq" qqn "answer\">Answer</a>"
next;
}
state == "qqa" && $1 != "<p>@@QQE@@" {
qqa[qqn] = qqa[qqn] $0 "\n";
if ($0 ~ /^<p>@@QQ/)
print "Bad Quick Quiz command: " NR " (expected <p>@@QQE@@)." > "/dev/stderr"
next;
}
state == "qqa" && $1 == "<p>@@QQE@@" {
state = "";
next;
}
state == "" && $1 == "<p>@@QQAL@@" {
haveqq = "";
print "<h3><a name=\"Answers to Quick Quizzes\">"
print "Answers to Quick Quizzes</a></h3>"
print "";
for (i = 1; i <= qqn; i++) {
print "<a name=\"qq" i "answer\"></a>"
print "<p><b>Quick Quiz " i "</b>:"
print qq[i];
print "";
print "</p><p><b>Answer</b>:"
print qqa[i];
print "";
print "</p><p><a href=\"#Quick%20Quiz%20" i "\"><b>Back to Quick Quiz " i "</b>.</a>"
print "";
}
next;
}
END {
if (state != "")
print "Unterminated Quick Quiz: " qqlineno "." > "/dev/stderr"
else if (haveqq)
print "Missing \"<p>@@QQAL@@\", no Quick Quiz." > "/dev/stderr"
}'

10
Documentation/RCU/trace.txt
View File

@ -237,17 +237,17 @@ o "ktl" is the low-order 16 bits (in hexadecimal) of the count of
The output of "cat rcu/rcu_preempt/rcuexp" looks as follows:
s=21872 wd0=0 wd1=0 wd2=0 wd3=5 n=0 enq=0 sc=21872
s=21872 wd1=0 wd2=0 wd3=5 n=0 enq=0 sc=21872
These fields are as follows:
o "s" is the sequence number, with an odd number indicating that
an expedited grace period is in progress.
o "wd0", "wd1", "wd2", and "wd3" are the number of times that an
attempt to start an expedited grace period found that someone
else had completed an expedited grace period that satisfies the
attempted request. "Our work is done."
o "wd1", "wd2", and "wd3" are the number of times that an attempt
to start an expedited grace period found that someone else had
completed an expedited grace period that satisfies the attempted
request. "Our work is done."
o "n" is number of times that a concurrent CPU-hotplug operation
forced a fallback to a normal grace period.

22
Documentation/RCU/whatisRCU.txt
View File

@ -681,22 +681,30 @@ Although RCU can be used in many different ways, a very common use of
RCU is analogous to reader-writer locking. The following unified
diff shows how closely related RCU and reader-writer locking can be.
@@ -5,5 +5,5 @@ struct el {
int data;
/* Other data fields */
};
-rwlock_t listmutex;
+spinlock_t listmutex;
struct el head;
@@ -13,15 +14,15 @@
struct list_head *lp;
struct el *p;
- read_lock();
- read_lock(&listmutex);
- list_for_each_entry(p, head, lp) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(p, head, lp) {
if (p->key == key) {
*result = p->data;
- read_unlock();
- read_unlock(&listmutex);
+ rcu_read_unlock();
return 1;
}
}
- read_unlock();
- read_unlock(&listmutex);
+ rcu_read_unlock();
return 0;
}
@ -732,7 +740,7 @@ Or, for those who prefer a side-by-side listing:
5 int data; 5 int data;
6 /* Other data fields */ 6 /* Other data fields */
7 }; 7 };
8 spinlock_t listmutex; 8 spinlock_t listmutex;
8 rwlock_t listmutex; 8 spinlock_t listmutex;
9 struct el head; 9 struct el head;
1 int search(long key, int *result) 1 int search(long key, int *result)
@ -740,15 +748,15 @@ Or, for those who prefer a side-by-side listing:
3 struct list_head *lp; 3 struct list_head *lp;
4 struct el *p; 4 struct el *p;
5 5
6 read_lock(); 6 rcu_read_lock();
6 read_lock(&listmutex); 6 rcu_read_lock();
7 list_for_each_entry(p, head, lp) { 7 list_for_each_entry_rcu(p, head, lp) {
8 if (p->key == key) { 8 if (p->key == key) {
9 *result = p->data; 9 *result = p->data;
10 read_unlock(); 10 rcu_read_unlock();
10 read_unlock(&listmutex); 10 rcu_read_unlock();
11 return 1; 11 return 1;
12 } 12 }
13 } 13 }
14 read_unlock(); 14 rcu_read_unlock();
14 read_unlock(&listmutex); 14 rcu_read_unlock();
15 return 0; 15 return 0;
16 } 16 }

61
Documentation/devicetree/bindings/regmap/regmap.txt
View File

@ -1,50 +1,29 @@
Device-Tree binding for regmap
The endianness mode of CPU & Device scenarios:
Index Device Endianness properties
---------------------------------------------------
1 BE 'big-endian'
2 LE 'little-endian'
3 Native 'native-endian'
For one device driver, which will run in different scenarios above
on different SoCs using the devicetree, we need one way to simplify
this.
Devicetree binding for regmap
Optional properties:
- {big,little,native}-endian: these are boolean properties, if absent
then the implementation will choose a default based on the device
being controlled. These properties are for register values and all
the buffers only. Native endian means that the CPU and device have
the same endianness.
little-endian,
big-endian,
native-endian: See common-properties.txt for a definition
Note:
Regmap defaults to little-endian register access on MMIO based
devices, this is by far the most common setting. On CPU
architectures that typically run big-endian operating systems
(e.g. PowerPC), registers can be defined as big-endian and must
be marked that way in the devicetree.
On SoCs that can be operated in both big-endian and little-endian
modes, with a single hardware switch controlling both the endianess
of the CPU and a byteswap for MMIO registers (e.g. many Broadcom MIPS
chips), "native-endian" is used to allow using the same device tree
blob in both cases.
Examples:
Scenario 1 : CPU in LE mode & device in LE mode.
Scenario 1 : a register set in big-endian mode.
dev: dev@40031000 {
compatible = "name";
compatible = "syscon";
reg = <0x40031000 0x1000>;
...
};
Scenario 2 : CPU in LE mode & device in BE mode.
dev: dev@40031000 {
compatible = "name";
reg = <0x40031000 0x1000>;
...
big-endian;
};
Scenario 3 : CPU in BE mode & device in BE mode.
dev: dev@40031000 {
compatible = "name";
reg = <0x40031000 0x1000>;
...
};
Scenario 4 : CPU in BE mode & device in LE mode.
dev: dev@40031000 {
compatible = "name";
reg = <0x40031000 0x1000>;
...
little-endian;
};

46
Documentation/kernel-parameters.txt
View File

@ -131,6 +131,7 @@ parameter is applicable:
More X86-64 boot options can be found in
Documentation/x86/x86_64/boot-options.txt .
X86 Either 32-bit or 64-bit x86 (same as X86-32+X86-64)
X86_UV SGI UV support is enabled.
XEN Xen support is enabled
In addition, the following text indicates that the option:
@ -542,6 +543,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Format: <int> (must be >=0)
Default: 64
bau= [X86_UV] Enable the BAU on SGI UV. The default
behavior is to disable the BAU (i.e. bau=0).
Format: { "0" | "1" }
0 - Disable the BAU.
1 - Enable the BAU.
unset - Disable the BAU.
baycom_epp= [HW,AX25]
Format: <io>,<mode>
@ -3284,6 +3292,44 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Lazy RCU callbacks are those which RCU can
prove do nothing more than free memory.
rcuperf.gp_exp= [KNL]
Measure performance of expedited synchronous
grace-period primitives.
rcuperf.holdoff= [KNL]
Set test-start holdoff period. The purpose of
this parameter is to delay the start of the
test until boot completes in order to avoid
interference.
rcuperf.nreaders= [KNL]
Set number of RCU readers. The value -1 selects
N, where N is the number of CPUs. A value
"n" less than -1 selects N-n+1, where N is again
the number of CPUs. For example, -2 selects N
(the number of CPUs), -3 selects N+1, and so on.
A value of "n" less than or equal to -N selects
a single reader.
rcuperf.nwriters= [KNL]
Set number of RCU writers. The values operate
the same as for rcuperf.nreaders.
N, where N is the number of CPUs
rcuperf.perf_runnable= [BOOT]
Start rcuperf running at boot time.
rcuperf.shutdown= [KNL]
Shut the system down after performance tests
complete. This is useful for hands-off automated
testing.
rcuperf.perf_type= [KNL]
Specify the RCU implementation to test.
rcuperf.verbose= [KNL]
Enable additional printk() statements.
rcutorture.cbflood_inter_holdoff= [KNL]
Set holdoff time (jiffies) between successive
callback-flood tests.

4
Documentation/locking/lockdep-design.txt
View File

@ -97,7 +97,7 @@ between any two lock-classes:
<hardirq-safe> -> <hardirq-unsafe>
<softirq-safe> -> <softirq-unsafe>
The first rule comes from the fact the a hardirq-safe lock could be
The first rule comes from the fact that a hardirq-safe lock could be
taken by a hardirq context, interrupting a hardirq-unsafe lock - and
thus could result in a lock inversion deadlock. Likewise, a softirq-safe
lock could be taken by an softirq context, interrupting a softirq-unsafe
@ -220,7 +220,7 @@ calculated, which hash is unique for every lock chain. The hash value,
when the chain is validated for the first time, is then put into a hash
table, which hash-table can be checked in a lockfree manner. If the
locking chain occurs again later on, the hash table tells us that we
dont have to validate the chain again.
don't have to validate the chain again.
Troubleshooting:
----------------

117
Documentation/memory-barriers.txt
View File

@ -4,8 +4,40 @@
By: David Howells <dhowells@redhat.com>
Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Will Deacon <will.deacon@arm.com>
Peter Zijlstra <peterz@infradead.org>
Contents:
==========
DISCLAIMER
==========
This document is not a specification; it is intentionally (for the sake of
brevity) and unintentionally (due to being human) incomplete. This document is
meant as a guide to using the various memory barriers provided by Linux, but
in case of any doubt (and there are many) please ask.
To repeat, this document is not a specification of what Linux expects from
hardware.
The purpose of this document is twofold:
(1) to specify the minimum functionality that one can rely on for any
particular barrier, and
(2) to provide a guide as to how to use the barriers that are available.
Note that an architecture can provide more than the minimum requirement
for any particular barrier, but if the architecure provides less than
that, that architecture is incorrect.
Note also that it is possible that a barrier may be a no-op for an
architecture because the way that arch works renders an explicit barrier
unnecessary in that case.
========
CONTENTS
========
(*) Abstract memory access model.
@ -31,15 +63,15 @@ Contents:
(*) Implicit kernel memory barriers.
- Locking functions.
- Lock acquisition functions.
- Interrupt disabling functions.
- Sleep and wake-up functions.
- Miscellaneous functions.
(*) Inter-CPU locking barrier effects.
(*) Inter-CPU acquiring barrier effects.
- Locks vs memory accesses.
- Locks vs I/O accesses.
- Acquires vs memory accesses.
- Acquires vs I/O accesses.
(*) Where are memory barriers needed?
@ -61,6 +93,7 @@ Contents:
(*) The things CPUs get up to.
- And then there's the Alpha.
- Virtual Machine Guests.
(*) Example uses.
@ -148,7 +181,7 @@ As a further example, consider this sequence of events:
CPU 1 CPU 2
=============== ===============
{ A == 1, B == 2, C = 3, P == &A, Q == &C }
{ A == 1, B == 2, C == 3, P == &A, Q == &C }
B = 4; Q = P;
P = &B D = *Q;
@ -430,8 +463,9 @@ And a couple of implicit varieties:
This acts as a one-way permeable barrier. It guarantees that all memory
operations after the ACQUIRE operation will appear to happen after the
ACQUIRE operation with respect to the other components of the system.
ACQUIRE operations include LOCK operations and smp_load_acquire()
operations.
ACQUIRE operations include LOCK operations and both smp_load_acquire()
and smp_cond_acquire() operations. The later builds the necessary ACQUIRE
semantics from relying on a control dependency and smp_rmb().
Memory operations that occur before an ACQUIRE operation may appear to
happen after it completes.
@ -464,6 +498,11 @@ And a couple of implicit varieties:
This means that ACQUIRE acts as a minimal "acquire" operation and
RELEASE acts as a minimal "release" operation.
A subset of the atomic operations described in atomic_ops.txt have ACQUIRE
and RELEASE variants in addition to fully-ordered and relaxed (no barrier
semantics) definitions. For compound atomics performing both a load and a
store, ACQUIRE semantics apply only to the load and RELEASE semantics apply
only to the store portion of the operation.
Memory barriers are only required where there's a possibility of interaction
between two CPUs or between a CPU and a device. If it can be guaranteed that
@ -517,7 +556,7 @@ following sequence of events:
CPU 1 CPU 2
=============== ===============
{ A == 1, B == 2, C = 3, P == &A, Q == &C }
{ A == 1, B == 2, C == 3, P == &A, Q == &C }
B = 4;
<write barrier>
WRITE_ONCE(P, &B)
@ -544,7 +583,7 @@ between the address load and the data load:
CPU 1 CPU 2
=============== ===============
{ A == 1, B == 2, C = 3, P == &A, Q == &C }
{ A == 1, B == 2, C == 3, P == &A, Q == &C }
B = 4;
<write barrier>
WRITE_ONCE(P, &B);
@ -813,9 +852,10 @@ In summary:
the same variable, then those stores must be ordered, either by
preceding both of them with smp_mb() or by using smp_store_release()
to carry out the stores. Please note that it is -not- sufficient
to use barrier() at beginning of each leg of the "if" statement,
as optimizing compilers do not necessarily respect barrier()
in this case.
to use barrier() at beginning of each leg of the "if" statement
because, as shown by the example above, optimizing compilers can
destroy the control dependency while respecting the letter of the
barrier() law.
(*) Control dependencies require at least one run-time conditional
between the prior load and the subsequent store, and this
@ -1731,15 +1771,15 @@ The Linux kernel has eight basic CPU memory barriers:
All memory barriers except the data dependency barriers imply a compiler
barrier. Data dependencies do not impose any additional compiler ordering.
barrier. Data dependencies do not impose any additional compiler ordering.
Aside: In the case of data dependencies, the compiler would be expected
to issue the loads in the correct order (eg. `a[b]` would have to load
the value of b before loading a[b]), however there is no guarantee in
the C specification that the compiler may not speculate the value of b
(eg. is equal to 1) and load a before b (eg. tmp = a[1]; if (b != 1)
tmp = a[b]; ). There is also the problem of a compiler reloading b after
having loaded a[b], thus having a newer copy of b than a[b]. A consensus
tmp = a[b]; ). There is also the problem of a compiler reloading b after
having loaded a[b], thus having a newer copy of b than a[b]. A consensus
has not yet been reached about these problems, however the READ_ONCE()
macro is a good place to start looking.
@ -1794,6 +1834,7 @@ There are some more advanced barrier functions:
(*) lockless_dereference();
This can be thought of as a pointer-fetch wrapper around the
smp_read_barrier_depends() data-dependency barrier.
@ -1858,7 +1899,7 @@ This is a variation on the mandatory write barrier that causes writes to weakly
ordered I/O regions to be partially ordered. Its effects may go beyond the
CPU->Hardware interface and actually affect the hardware at some level.
See the subsection "Locks vs I/O accesses" for more information.
See the subsection "Acquires vs I/O accesses" for more information.
===============================
@ -1873,8 +1914,8 @@ provide more substantial guarantees, but these may not be relied upon outside
of arch specific code.
ACQUIRING FUNCTIONS
-------------------
LOCK ACQUISITION FUNCTIONS
--------------------------
The Linux kernel has a number of locking constructs:
@ -1895,7 +1936,7 @@ for each construct. These operations all imply certain barriers:
Memory operations issued before the ACQUIRE may be completed after
the ACQUIRE operation has completed. An smp_mb__before_spinlock(),
combined with a following ACQUIRE, orders prior stores against
subsequent loads and stores. Note that this is weaker than smp_mb()!
subsequent loads and stores. Note that this is weaker than smp_mb()!
The smp_mb__before_spinlock() primitive is free on many architectures.
(2) RELEASE operation implication:
@ -2090,9 +2131,9 @@ or:
event_indicated = 1;
wake_up_process(event_daemon);
A write memory barrier is implied by wake_up() and co. if and only if they wake
something up. The barrier occurs before the task state is cleared, and so sits
between the STORE to indicate the event and the STORE to set TASK_RUNNING:
A write memory barrier is implied by wake_up() and co. if and only if they
wake something up. The barrier occurs before the task state is cleared, and so
sits between the STORE to indicate the event and the STORE to set TASK_RUNNING:
CPU 1 CPU 2
=============================== ===============================
@ -2206,7 +2247,7 @@ three CPUs; then should the following sequence of events occur:
Then there is no guarantee as to what order CPU 3 will see the accesses to *A
through *H occur in, other than the constraints imposed by the separate locks
on the separate CPUs. It might, for example, see:
on the separate CPUs. It might, for example, see:
*E, ACQUIRE M, ACQUIRE Q, *G, *C, *F, *A, *B, RELEASE Q, *D, *H, RELEASE M
@ -2486,9 +2527,9 @@ The following operations are special locking primitives:
clear_bit_unlock();
__clear_bit_unlock();
These implement ACQUIRE-class and RELEASE-class operations. These should be used in
preference to other operations when implementing locking primitives, because
their implementations can be optimised on many architectures.
These implement ACQUIRE-class and RELEASE-class operations. These should be
used in preference to other operations when implementing locking primitives,
because their implementations can be optimised on many architectures.
[!] Note that special memory barrier primitives are available for these
situations because on some CPUs the atomic instructions used imply full memory
@ -2568,12 +2609,12 @@ explicit barriers are used.
Normally this won't be a problem because the I/O accesses done inside such
sections will include synchronous load operations on strictly ordered I/O
registers that form implicit I/O barriers. If this isn't sufficient then an
registers that form implicit I/O barriers. If this isn't sufficient then an
mmiowb() may need to be used explicitly.
A similar situation may occur between an interrupt routine and two routines
running on separate CPUs that communicate with each other. If such a case is
running on separate CPUs that communicate with each other. If such a case is
likely, then interrupt-disabling locks should be used to guarantee ordering.
@ -2587,8 +2628,8 @@ functions:
(*) inX(), outX():
These are intended to talk to I/O space rather than memory space, but
that's primarily a CPU-specific concept. The i386 and x86_64 processors do
indeed have special I/O space access cycles and instructions, but many
that's primarily a CPU-specific concept. The i386 and x86_64 processors
do indeed have special I/O space access cycles and instructions, but many
CPUs don't have such a concept.
The PCI bus, amongst others, defines an I/O space concept which - on such
@ -2610,7 +2651,7 @@ functions:
Whether these are guaranteed to be fully ordered and uncombined with
respect to each other on the issuing CPU depends on the characteristics
defined for the memory window through which they're accessing. On later
defined for the memory window through which they're accessing. On later
i386 architecture machines, for example, this is controlled by way of the
MTRR registers.
@ -2635,10 +2676,10 @@ functions:
(*) readX_relaxed(), writeX_relaxed()
These are similar to readX() and writeX(), but provide weaker memory
ordering guarantees. Specifically, they do not guarantee ordering with
ordering guarantees. Specifically, they do not guarantee ordering with
respect to normal memory accesses (e.g. DMA buffers) nor do they guarantee
ordering with respect to LOCK or UNLOCK operations. If the latter is
required, an mmiowb() barrier can be used. Note that relaxed accesses to
ordering with respect to LOCK or UNLOCK operations. If the latter is
required, an mmiowb() barrier can be used. Note that relaxed accesses to
the same peripheral are guaranteed to be ordered with respect to each
other.
@ -3040,8 +3081,9 @@ The Alpha defines the Linux kernel's memory barrier model.
See the subsection on "Cache Coherency" above.
VIRTUAL MACHINE GUESTS
-------------------
----------------------
Guests running within virtual machines might be affected by SMP effects even if
the guest itself is compiled without SMP support. This is an artifact of
@ -3050,7 +3092,7 @@ barriers for this use-case would be possible but is often suboptimal.
To handle this case optimally, low-level virt_mb() etc macros are available.
These have the same effect as smp_mb() etc when SMP is enabled, but generate
identical code for SMP and non-SMP systems. For example, virtual machine guests
identical code for SMP and non-SMP systems. For example, virtual machine guests
should use virt_mb() rather than smp_mb() when synchronizing against a
(possibly SMP) host.
@ -3058,6 +3100,7 @@ These are equivalent to smp_mb() etc counterparts in all other respects,
in particular, they do not control MMIO effects: to control
MMIO effects, use mandatory barriers.
============
EXAMPLE USES
============

14
Documentation/sysctl/kernel.txt
View File

@ -60,6 +60,7 @@ show up in /proc/sys/kernel:
- panic_on_warn
- perf_cpu_time_max_percent
- perf_event_paranoid
- perf_event_max_stack
- pid_max
- powersave-nap [ PPC only ]
- printk
@ -654,6 +655,19 @@ users (without CAP_SYS_ADMIN). The default value is 2.
==============================================================
perf_event_max_stack:
Controls maximum number of stack frames to copy for (attr.sample_type &
PERF_SAMPLE_CALLCHAIN) configured events, for instance, when using
'perf record -g' or 'perf trace --call-graph fp'.
This can only be done when no events are in use that have callchains
enabled, otherwise writing to this file will return -EBUSY.
The default value is 127.
==============================================================
pid_max:
PID allocation wrap value. When the kernel's next PID value

10
Documentation/trace/ftrace.txt
View File

@ -1562,12 +1562,12 @@ Doing the same with chrt -r 5 and function-trace set.
<idle>-0 3dN.1 12us : menu_hrtimer_cancel <-tick_nohz_idle_exit
<idle>-0 3dN.1 12us : ktime_get <-tick_nohz_idle_exit
<idle>-0 3dN.1 12us : tick_do_update_jiffies64 <-tick_nohz_idle_exit
<idle>-0 3dN.1 13us : update_cpu_load_nohz <-tick_nohz_idle_exit
<idle>-0 3dN.1 13us : _raw_spin_lock <-update_cpu_load_nohz
<idle>-0 3dN.1 13us : cpu_load_update_nohz <-tick_nohz_idle_exit
<idle>-0 3dN.1 13us : _raw_spin_lock <-cpu_load_update_nohz
<idle>-0 3dN.1 13us : add_preempt_count <-_raw_spin_lock
<idle>-0 3dN.2 13us : __update_cpu_load <-update_cpu_load_nohz
<idle>-0 3dN.2 14us : sched_avg_update <-__update_cpu_load
<idle>-0 3dN.2 14us : _raw_spin_unlock <-update_cpu_load_nohz
<idle>-0 3dN.2 13us : __cpu_load_update <-cpu_load_update_nohz
<idle>-0 3dN.2 14us : sched_avg_update <-__cpu_load_update
<idle>-0 3dN.2 14us : _raw_spin_unlock <-cpu_load_update_nohz
<idle>-0 3dN.2 14us : sub_preempt_count <-_raw_spin_unlock
<idle>-0 3dN.1 15us : calc_load_exit_idle <-tick_nohz_idle_exit
<idle>-0 3dN.1 15us : touch_softlockup_watchdog <-tick_nohz_idle_exit

32
Documentation/x86/pat.txt
View File

@ -196,3 +196,35 @@ Another, more verbose way of getting PAT related debug messages is with
"debugpat" boot parameter. With this parameter, various debug messages are
printed to dmesg log.
PAT Initialization
------------------
The following table describes how PAT is initialized under various
configurations. The PAT MSR must be updated by Linux in order to support WC
and WT attributes. Otherwise, the PAT MSR has the value programmed in it
by the firmware. Note, Xen enables WC attribute in the PAT MSR for guests.
MTRR PAT Call Sequence PAT State PAT MSR
=========================================================
E E MTRR -> PAT init Enabled OS
E D MTRR -> PAT init Disabled -
D E MTRR -> PAT disable Disabled BIOS
D D MTRR -> PAT disable Disabled -
- np/E PAT -> PAT disable Disabled BIOS
- np/D PAT -> PAT disable Disabled -
E !P/E MTRR -> PAT init Disabled BIOS
D !P/E MTRR -> PAT disable Disabled BIOS
!M !P/E MTRR stub -> PAT disable Disabled BIOS
Legend
------------------------------------------------
E Feature enabled in CPU
D Feature disabled/unsupported in CPU
np "nopat" boot option specified
!P CONFIG_X86_PAT option unset
!M CONFIG_MTRR option unset
Enabled PAT state set to enabled
Disabled PAT state set to disabled
OS PAT initializes PAT MSR with OS setting
BIOS PAT keeps PAT MSR with BIOS setting

2
Makefile
View File

@ -1,7 +1,7 @@
VERSION = 4
PATCHLEVEL = 6
SUBLEVEL = 0
EXTRAVERSION = -rc7
EXTRAVERSION =
NAME = Charred Weasel
# *DOCUMENTATION*

18
arch/alpha/include/asm/rwsem.h
View File

@ -63,7 +63,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
return res >= 0 ? 1 : 0;
}
static inline void __down_write(struct rw_semaphore *sem)
static inline long ___down_write(struct rw_semaphore *sem)
{
long oldcount;
#ifndef CONFIG_SMP
@ -83,10 +83,24 @@ static inline void __down_write(struct rw_semaphore *sem)
:"=&r" (oldcount), "=m" (sem->count), "=&r" (temp)
:"Ir" (RWSEM_ACTIVE_WRITE_BIAS), "m" (sem->count) : "memory");
#endif
if (unlikely(oldcount))
return oldcount;
}
static inline void __down_write(struct rw_semaphore *sem)
{
if (unlikely(___down_write(sem)))
rwsem_down_write_failed(sem);
}
static inline int __down_write_killable(struct rw_semaphore *sem)
{
if (unlikely(___down_write(sem)))
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
return -EINTR;
return 0;
}
/*
* trylock for writing -- returns 1 if successful, 0 if contention
*/

2
arch/arm/boot/dts/at91sam9x5.dtsi
View File

@ -106,7 +106,7 @@ ramc0: ramc@ffffe800 {
pmc: pmc@fffffc00 {
compatible = "atmel,at91sam9x5-pmc", "syscon";
reg = <0xfffffc00 0x100>;
reg = <0xfffffc00 0x200>;
interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
interrupt-controller;
#address-cells = <1>;

2
arch/arm/boot/dts/sama5d2.dtsi
View File

@ -280,7 +280,7 @@ nand0: nand@80000000 {
status = "disabled";
nfc@c0000000 {
compatible = "atmel,sama5d4-nfc";
compatible = "atmel,sama5d3-nfc";
#address-cells = <1>;
#size-cells = <1>;
reg = < /* NFC Command Registers */

37
arch/arm/include/asm/efi.h
View File

@ -17,33 +17,27 @@
#include <asm/mach/map.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/ptrace.h>
#ifdef CONFIG_EFI
void efi_init(void);
int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
#define efi_call_virt(f, ...) \
#define arch_efi_call_virt_setup() efi_virtmap_load()
#define arch_efi_call_virt_teardown() efi_virtmap_unload()
#define arch_efi_call_virt(f, args...) \
({ \
efi_##f##_t *__f; \
efi_status_t __s; \
\
efi_virtmap_load(); \
__f = efi.systab->runtime->f; \
__s = __f(__VA_ARGS__); \
efi_virtmap_unload(); \
__s; \
__f(args); \
})
#define __efi_call_virt(f, ...) \
({ \
efi_##f##_t *__f; \
\
efi_virtmap_load(); \
__f = efi.systab->runtime->f; \
__f(__VA_ARGS__); \
efi_virtmap_unload(); \
})
#define ARCH_EFI_IRQ_FLAGS_MASK \
(PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
PSR_T_BIT | MODE_MASK)
static inline void efi_set_pgd(struct mm_struct *mm)
{
@ -59,7 +53,16 @@ void efi_virtmap_unload(void);
/* arch specific definitions used by the stub code */
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
#define __efi_call_early(f, ...) f(__VA_ARGS__)
#define efi_is_64bit() (false)
struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg);
void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si);
static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
{
}
/*
* A reasonable upper bound for the uncompressed kernel size is 32 MBytes,

3
arch/arm/include/asm/mmu_context.h
View File

@ -15,6 +15,7 @@
#include <linux/compiler.h>
#include <linux/sched.h>
#include <linux/preempt.h>
#include <asm/cacheflush.h>
#include <asm/cachetype.h>
#include <asm/proc-fns.h>
@ -66,6 +67,7 @@ static inline void check_and_switch_context(struct mm_struct *mm,
cpu_switch_mm(mm->pgd, mm);
}
#ifndef MODULE
#define finish_arch_post_lock_switch \
finish_arch_post_lock_switch
static inline void finish_arch_post_lock_switch(void)
@ -87,6 +89,7 @@ static inline void finish_arch_post_lock_switch(void)
preempt_enable_no_resched();
}
}
#endif /* !MODULE */
#endif /* CONFIG_MMU */

41
arch/arm/kernel/efi.c
View File

@ -11,6 +11,41 @@
#include <asm/mach/map.h>
#include <asm/mmu_context.h>
static int __init set_permissions(pte_t *ptep, pgtable_t token,
unsigned long addr, void *data)
{
efi_memory_desc_t *md = data;
pte_t pte = *ptep;
if (md->attribute & EFI_MEMORY_RO)
pte = set_pte_bit(pte, __pgprot(L_PTE_RDONLY));
if (md->attribute & EFI_MEMORY_XP)
pte = set_pte_bit(pte, __pgprot(L_PTE_XN));
set_pte_ext(ptep, pte, PTE_EXT_NG);
return 0;
}
int __init efi_set_mapping_permissions(struct mm_struct *mm,
efi_memory_desc_t *md)
{
unsigned long base, size;
base = md->virt_addr;
size = md->num_pages << EFI_PAGE_SHIFT;
/*
* We can only use apply_to_page_range() if we can guarantee that the
* entire region was mapped using pages. This should be the case if the
* region does not cover any naturally aligned SECTION_SIZE sized
* blocks.
*/
if (round_down(base + size, SECTION_SIZE) <
round_up(base, SECTION_SIZE) + SECTION_SIZE)
return apply_to_page_range(mm, base, size, set_permissions, md);
return 0;
}
int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
{
struct map_desc desc = {
@ -34,5 +69,11 @@ int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
desc.type = MT_DEVICE;
create_mapping_late(mm, &desc, true);
/*
* If stricter permissions were specified, apply them now.
*/
if (md->attribute & (EFI_MEMORY_RO | EFI_MEMORY_XP))
return efi_set_mapping_permissions(mm, md);
return 0;
}

4
arch/arm/kernel/hw_breakpoint.c
View File

@ -631,7 +631,7 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
info->address &= ~alignment_mask;
info->ctrl.len <<= offset;
if (!bp->overflow_handler) {
if (is_default_overflow_handler(bp)) {
/*
* Mismatch breakpoints are required for single-stepping
* breakpoints.
@ -754,7 +754,7 @@ static void watchpoint_handler(unsigned long addr, unsigned int fsr,
* mismatch breakpoint so we can single-step over the
* watchpoint trigger.
*/
if (!wp->overflow_handler)
if (is_default_overflow_handler(wp))
enable_single_step(wp, instruction_pointer(regs));
unlock:

2
arch/arm/kernel/perf_callchain.c
View File

@ -75,7 +75,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
tail = (struct frame_tail __user *)regs->ARM_fp - 1;
while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
while ((entry->nr < sysctl_perf_event_max_stack) &&
tail && !((unsigned long)tail & 0x3))
tail = user_backtrace(tail, entry);
}

3
arch/arm/kernel/setup.c
View File

@ -883,7 +883,8 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
request_resource(&ioport_resource, &lp2);
}
#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) || \
defined(CONFIG_EFI)
struct screen_info screen_info = {
.orig_video_lines = 30,
.orig_video_cols = 80,

1
arch/arm64/Kconfig.platforms
View File

@ -2,6 +2,7 @@ menu "Platform selection"
config ARCH_SUNXI
bool "Allwinner sunxi 64-bit SoC Family"
select GENERIC_IRQ_CHIP
help
This enables support for Allwinner sunxi based SoCs like the A64.

37
arch/arm64/include/asm/efi.h
View File

@ -4,6 +4,7 @@
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/neon.h>
#include <asm/ptrace.h>
#include <asm/tlbflush.h>
#ifdef CONFIG_EFI
@ -14,32 +15,29 @@ extern void efi_init(void);
int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
#define efi_call_virt(f, ...) \
#define efi_set_mapping_permissions efi_create_mapping
#define arch_efi_call_virt_setup() \
({ \
efi_##f##_t *__f; \
efi_status_t __s; \
\
kernel_neon_begin(); \
efi_virtmap_load(); \
__f = efi.systab->runtime->f; \
__s = __f(__VA_ARGS__); \
efi_virtmap_unload(); \
kernel_neon_end(); \
__s; \
})
#define __efi_call_virt(f, ...) \
#define arch_efi_call_virt(f, args...) \
({ \
efi_##f##_t *__f; \
\
kernel_neon_begin(); \
efi_virtmap_load(); \
__f = efi.systab->runtime->f; \
__f(__VA_ARGS__); \
__f(args); \
})
#define arch_efi_call_virt_teardown() \
({ \
efi_virtmap_unload(); \
kernel_neon_end(); \
})
#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
/* arch specific definitions used by the stub code */
/*
@ -50,7 +48,16 @@ int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
#define MAX_FDT_OFFSET SZ_512M
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
#define __efi_call_early(f, ...) f(__VA_ARGS__)
#define efi_is_64bit() (true)
#define alloc_screen_info(x...) &screen_info
#define free_screen_info(x...)
static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
{
}
#define EFI_ALLOC_ALIGN SZ_64K

57
arch/arm64/kernel/efi.c
View File

@ -17,22 +17,51 @@
#include <asm/efi.h>
/*
* Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
* executable, everything else can be mapped with the XN bits
* set. Also take the new (optional) RO/XP bits into account.
*/
static __init pteval_t create_mapping_protection(efi_memory_desc_t *md)
{
u64 attr = md->attribute;
u32 type = md->type;
if (type == EFI_MEMORY_MAPPED_IO)
return PROT_DEVICE_nGnRE;
if (WARN_ONCE(!PAGE_ALIGNED(md->phys_addr),
"UEFI Runtime regions are not aligned to 64 KB -- buggy firmware?"))
/*
* If the region is not aligned to the page size of the OS, we
* can not use strict permissions, since that would also affect
* the mapping attributes of the adjacent regions.
*/
return pgprot_val(PAGE_KERNEL_EXEC);
/* R-- */
if ((attr & (EFI_MEMORY_XP | EFI_MEMORY_RO)) ==
(EFI_MEMORY_XP | EFI_MEMORY_RO))
return pgprot_val(PAGE_KERNEL_RO);
/* R-X */
if (attr & EFI_MEMORY_RO)
return pgprot_val(PAGE_KERNEL_ROX);
/* RW- */
if (attr & EFI_MEMORY_XP || type != EFI_RUNTIME_SERVICES_CODE)
return pgprot_val(PAGE_KERNEL);
/* RWX */
return pgprot_val(PAGE_KERNEL_EXEC);
}
/* we will fill this structure from the stub, so don't put it in .bss */
struct screen_info screen_info __section(.data);
int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
{
pteval_t prot_val;
/*
* Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
* executable, everything else can be mapped with the XN bits
* set.
*/
if ((md->attribute & EFI_MEMORY_WB) == 0)
prot_val = PROT_DEVICE_nGnRE;
else if (md->type == EFI_RUNTIME_SERVICES_CODE ||
!PAGE_ALIGNED(md->phys_addr))
prot_val = pgprot_val(PAGE_KERNEL_EXEC);
else
prot_val = pgprot_val(PAGE_KERNEL);
pteval_t prot_val = create_mapping_protection(md);
create_pgd_mapping(mm, md->phys_addr, md->virt_addr,
md->num_pages << EFI_PAGE_SHIFT,

4
arch/arm64/kernel/hw_breakpoint.c
View File

@ -616,7 +616,7 @@ static int breakpoint_handler(unsigned long unused, unsigned int esr,
perf_bp_event(bp, regs);
/* Do we need to handle the stepping? */
if (!bp->overflow_handler)
if (is_default_overflow_handler(bp))
step = 1;
unlock:
rcu_read_unlock();
@ -712,7 +712,7 @@ static int watchpoint_handler(unsigned long addr, unsigned int esr,
perf_bp_event(wp, regs);
/* Do we need to handle the stepping? */
if (!wp->overflow_handler)
if (is_default_overflow_handler(wp))
step = 1;
unlock:

1
arch/arm64/kernel/image.h
View File

@ -112,6 +112,7 @@ __efistub___memset = KALLSYMS_HIDE(__pi_memset);
__efistub__text = KALLSYMS_HIDE(_text);
__efistub__end = KALLSYMS_HIDE(_end);
__efistub__edata = KALLSYMS_HIDE(_edata);
__efistub_screen_info = KALLSYMS_HIDE(screen_info);
#endif

4
arch/arm64/kernel/perf_callchain.c
View File

@ -122,7 +122,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
tail = (struct frame_tail __user *)regs->regs[29];
while (entry->nr < PERF_MAX_STACK_DEPTH &&
while (entry->nr < sysctl_perf_event_max_stack &&
tail && !((unsigned long)tail & 0xf))
tail = user_backtrace(tail, entry);
} else {
@ -132,7 +132,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
tail = (struct compat_frame_tail __user *)regs->compat_fp - 1;
while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
while ((entry->nr < sysctl_perf_event_max_stack) &&
tail && !((unsigned long)tail & 0x3))
tail = compat_user_backtrace(tail, entry);
#endif

1
arch/arm64/net/bpf_jit_comp.c
View File

@ -476,6 +476,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
case BPF_JGE:
jmp_cond = A64_COND_CS;
break;
case BPF_JSET:
case BPF_JNE:
jmp_cond = A64_COND_NE;
break;

1
arch/ia64/include/asm/iommu.h
View File

@ -1,7 +1,6 @@
#ifndef _ASM_IA64_IOMMU_H
#define _ASM_IA64_IOMMU_H 1
#define cpu_has_x2apic 0
/* 10 seconds */
#define DMAR_OPERATION_TIMEOUT (((cycles_t) local_cpu_data->itc_freq)*10)

22
arch/ia64/include/asm/rwsem.h
View File

@ -49,8 +49,8 @@ __down_read (struct rw_semaphore *sem)
/*
* lock for writing
*/
static inline void
__down_write (struct rw_semaphore *sem)
static inline long
___down_write (struct rw_semaphore *sem)
{
long old, new;
@ -59,10 +59,26 @@ __down_write (struct rw_semaphore *sem)
new = old + RWSEM_ACTIVE_WRITE_BIAS;
} while (cmpxchg_acq(&sem->count, old, new) != old);
if (old != 0)
return old;
}
static inline void
__down_write (struct rw_semaphore *sem)
{
if (___down_write(sem))
rwsem_down_write_failed(sem);
}
static inline int
__down_write_killable (struct rw_semaphore *sem)
{
if (___down_write(sem))
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
return -EINTR;
return 0;
}
/*
* unlock after reading
*/

2
arch/ia64/kernel/efi.c
View File

@ -531,8 +531,6 @@ efi_init (void)
efi.systab->hdr.revision >> 16,
efi.systab->hdr.revision & 0xffff, vendor);
set_bit(EFI_SYSTEM_TABLES, &efi.flags);
palo_phys = EFI_INVALID_TABLE_ADDR;
if (efi_config_init(arch_tables) != 0)

2
arch/metag/kernel/perf_callchain.c
View File

@ -65,7 +65,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
--frame;
while ((entry->nr < PERF_MAX_STACK_DEPTH) && frame)
while ((entry->nr < sysctl_perf_event_max_stack) && frame)
frame = user_backtrace(frame, entry);
}

4
arch/mips/kernel/perf_event.c
View File

@ -35,7 +35,7 @@ static void save_raw_perf_callchain(struct perf_callchain_entry *entry,
addr = *sp++;
if (__kernel_text_address(addr)) {
perf_callchain_store(entry, addr);
if (entry->nr >= PERF_MAX_STACK_DEPTH)
if (entry->nr >= sysctl_perf_event_max_stack)
break;
}
}
@ -59,7 +59,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
}
do {
perf_callchain_store(entry, pc);
if (entry->nr >= PERF_MAX_STACK_DEPTH)
if (entry->nr >= sysctl_perf_event_max_stack)
break;
pc = unwind_stack(current, &sp, pc, &ra);
} while (pc);

2
arch/powerpc/kernel/smp.c
View File

@ -565,7 +565,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
smp_ops->give_timebase();
/* Wait until cpu puts itself in the online & active maps */
while (!cpu_online(cpu) || !cpu_active(cpu))
while (!cpu_online(cpu))
cpu_relax();
return 0;

4
arch/powerpc/perf/callchain.c
View File

@ -247,7 +247,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry,
sp = regs->gpr[1];
perf_callchain_store(entry, next_ip);
while (entry->nr < PERF_MAX_STACK_DEPTH) {
while (entry->nr < sysctl_perf_event_max_stack) {
fp = (unsigned long __user *) sp;
if (!valid_user_sp(sp, 1) || read_user_stack_64(fp, &next_sp))
return;
@ -453,7 +453,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry,
sp = regs->gpr[1];
perf_callchain_store(entry, next_ip);
while (entry->nr < PERF_MAX_STACK_DEPTH) {
while (entry->nr < sysctl_perf_event_max_stack) {
fp = (unsigned int __user *) (unsigned long) sp;
if (!valid_user_sp(sp, 0) || read_user_stack_32(fp, &next_sp))
return;

18
arch/s390/include/asm/rwsem.h
View File

@ -90,7 +90,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
/*
* lock for writing
*/
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
static inline long ___down_write(struct rw_semaphore *sem)
{
signed long old, new, tmp;
@ -104,13 +104,23 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
: "=&d" (old), "=&d" (new), "=Q" (sem->count)
: "Q" (sem->count), "m" (tmp)
: "cc", "memory");
if (old != 0)
rwsem_down_write_failed(sem);
return old;
}
static inline void __down_write(struct rw_semaphore *sem)
{
__down_write_nested(sem, 0);
if (___down_write(sem))
rwsem_down_write_failed(sem);
}
static inline int __down_write_killable(struct rw_semaphore *sem)
{
if (___down_write(sem))
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
return -EINTR;
return 0;
}
/*

2
arch/s390/kernel/smp.c
View File

@ -832,7 +832,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
pcpu_attach_task(pcpu, tidle);
pcpu_start_fn(pcpu, smp_start_secondary, NULL);
/* Wait until cpu puts itself in the online & active maps */
while (!cpu_online(cpu) || !cpu_active(cpu))
while (!cpu_online(cpu))
cpu_relax();
return 0;
}

1
arch/sh/include/asm/Kbuild
View File

@ -26,6 +26,7 @@ generic-y += percpu.h
generic-y += poll.h
generic-y += preempt.h
generic-y += resource.h
generic-y += rwsem.h
generic-y += sembuf.h
generic-y += serial.h
generic-y += shmbuf.h

132
arch/sh/include/asm/rwsem.h
View File

@ -1,132 +0,0 @@
/*
* include/asm-sh/rwsem.h: R/W semaphores for SH using the stuff
* in lib/rwsem.c.
*/
#ifndef _ASM_SH_RWSEM_H
#define _ASM_SH_RWSEM_H
#ifndef _LINUX_RWSEM_H
#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead"
#endif
#ifdef __KERNEL__
#define RWSEM_UNLOCKED_VALUE 0x00000000
#define RWSEM_ACTIVE_BIAS 0x00000001
#define RWSEM_ACTIVE_MASK 0x0000ffff
#define RWSEM_WAITING_BIAS (-0x00010000)
#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
/*
* lock for reading
*/
static inline void __down_read(struct rw_semaphore *sem)
{
if (atomic_inc_return((atomic_t *)(&sem->count)) > 0)
smp_wmb();
else
rwsem_down_read_failed(sem);
}
static inline int __down_read_trylock(struct rw_semaphore *sem)
{
int tmp;
while ((tmp = sem->count) >= 0) {
if (tmp == cmpxchg(&sem->count, tmp,
tmp + RWSEM_ACTIVE_READ_BIAS)) {
smp_wmb();
return 1;
}
}
return 0;
}
/*
* lock for writing
*/
static inline void __down_write(struct rw_semaphore *sem)
{
int tmp;
tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS,
(atomic_t *)(&sem->count));
if (tmp == RWSEM_ACTIVE_WRITE_BIAS)
smp_wmb();
else
rwsem_down_write_failed(sem);
}
static inline int __down_write_trylock(struct rw_semaphore *sem)
{
int tmp;
tmp = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
RWSEM_ACTIVE_WRITE_BIAS);
smp_wmb();
return tmp == RWSEM_UNLOCKED_VALUE;
}
/*
* unlock after reading
*/
static inline void __up_read(struct rw_semaphore *sem)
{
int tmp;
smp_wmb();
tmp = atomic_dec_return((atomic_t *)(&sem->count));
if (tmp < -1 && (tmp & RWSEM_ACTIVE_MASK) == 0)
rwsem_wake(sem);
}
/*
* unlock after writing
*/
static inline void __up_write(struct rw_semaphore *sem)
{
smp_wmb();
if (atomic_sub_return(RWSEM_ACTIVE_WRITE_BIAS,
(atomic_t *)(&sem->count)) < 0)
rwsem_wake(sem);
}
/*
* implement atomic add functionality
*/
static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem)
{
atomic_add(delta, (atomic_t *)(&sem->count));
}
/*
* downgrade write lock to read lock
*/
static inline void __downgrade_write(struct rw_semaphore *sem)
{
int tmp;
smp_wmb();
tmp = atomic_add_return(-RWSEM_WAITING_BIAS, (atomic_t *)(&sem->count));
if (tmp < 0)
rwsem_downgrade_wake(sem);
}
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
{
__down_write(sem);
}
/*
* implement exchange and add functionality
*/
static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
{
smp_mb();
return atomic_add_return(delta, (atomic_t *)(&sem->count));
}
#endif /* __KERNEL__ */
#endif /* _ASM_SH_RWSEM_H */

1
arch/sparc/include/asm/Kbuild
View File

@ -16,6 +16,7 @@ generic-y += mm-arch-hooks.h
generic-y += module.h
generic-y += mutex.h
generic-y += preempt.h
generic-y += rwsem.h
generic-y += serial.h
generic-y += trace_clock.h
generic-y += types.h

124
arch/sparc/include/asm/rwsem.h
View File

@ -1,124 +0,0 @@
/*
* rwsem.h: R/W semaphores implemented using CAS
*
* Written by David S. Miller (davem@redhat.com), 2001.
* Derived from asm-i386/rwsem.h
*/
#ifndef _SPARC64_RWSEM_H
#define _SPARC64_RWSEM_H
#ifndef _LINUX_RWSEM_H
#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead"
#endif
#ifdef __KERNEL__
#define RWSEM_UNLOCKED_VALUE 0x00000000L
#define RWSEM_ACTIVE_BIAS 0x00000001L
#define RWSEM_ACTIVE_MASK 0xffffffffL
#define RWSEM_WAITING_BIAS (-RWSEM_ACTIVE_MASK-1)
#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
/*
* lock for reading
*/
static inline void __down_read(struct rw_semaphore *sem)
{
if (unlikely(atomic64_inc_return((atomic64_t *)(&sem->count)) <= 0L))
rwsem_down_read_failed(sem);
}
static inline int __down_read_trylock(struct rw_semaphore *sem)
{
long tmp;
while ((tmp = sem->count) >= 0L) {
if (tmp == cmpxchg(&sem->count, tmp,
tmp + RWSEM_ACTIVE_READ_BIAS)) {
return 1;
}
}
return 0;
}
/*
* lock for writing
*/
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
{
long tmp;
tmp = atomic64_add_return(RWSEM_ACTIVE_WRITE_BIAS,
(atomic64_t *)(&sem->count));
if (unlikely(tmp != RWSEM_ACTIVE_WRITE_BIAS))
rwsem_down_write_failed(sem);
}
static inline void __down_write(struct rw_semaphore *sem)
{
__down_write_nested(sem, 0);
}
static inline int __down_write_trylock(struct rw_semaphore *sem)
{
long tmp;
tmp = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
RWSEM_ACTIVE_WRITE_BIAS);
return tmp == RWSEM_UNLOCKED_VALUE;
}
/*
* unlock after reading
*/
static inline void __up_read(struct rw_semaphore *sem)
{
long tmp;
tmp = atomic64_dec_return((atomic64_t *)(&sem->count));
if (unlikely(tmp < -1L && (tmp & RWSEM_ACTIVE_MASK) == 0L))
rwsem_wake(sem);
}
/*
* unlock after writing
*/
static inline void __up_write(struct rw_semaphore *sem)
{
if (unlikely(atomic64_sub_return(RWSEM_ACTIVE_WRITE_BIAS,
(atomic64_t *)(&sem->count)) < 0L))
rwsem_wake(sem);
}
/*
* implement atomic add functionality
*/
static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem)
{
atomic64_add(delta, (atomic64_t *)(&sem->count));
}
/*
* downgrade write lock to read lock
*/
static inline void __downgrade_write(struct rw_semaphore *sem)
{
long tmp;
tmp = atomic64_add_return(-RWSEM_WAITING_BIAS, (atomic64_t *)(&sem->count));
if (tmp < 0L)
rwsem_downgrade_wake(sem);
}
/*
* implement exchange and add functionality
*/
static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem)
{
return atomic64_add_return(delta, (atomic64_t *)(&sem->count));
}
#endif /* __KERNEL__ */
#endif /* _SPARC64_RWSEM_H */

6
arch/sparc/kernel/perf_event.c
View File

@ -1756,7 +1756,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
}
}
#endif
} while (entry->nr < PERF_MAX_STACK_DEPTH);
} while (entry->nr < sysctl_perf_event_max_stack);
}
static inline int
@ -1790,7 +1790,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry,
pc = sf.callers_pc;
ufp = (unsigned long)sf.fp + STACK_BIAS;
perf_callchain_store(entry, pc);
} while (entry->nr < PERF_MAX_STACK_DEPTH);
} while (entry->nr < sysctl_perf_event_max_stack);
}
static void perf_callchain_user_32(struct perf_callchain_entry *entry,
@ -1822,7 +1822,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry,
ufp = (unsigned long)sf.fp;
}
perf_callchain_store(entry, pc);
} while (entry->nr < PERF_MAX_STACK_DEPTH);
} while (entry->nr < sysctl_perf_event_max_stack);
}
void

79
arch/x86/Kconfig
View File

@ -164,10 +164,6 @@ config INSTRUCTION_DECODER
def_bool y
depends on KPROBES || PERF_EVENTS || UPROBES
config PERF_EVENTS_INTEL_UNCORE
def_bool y
depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
config OUTPUT_FORMAT
string
default "elf32-i386" if X86_32
@ -1046,6 +1042,8 @@ config X86_THERMAL_VECTOR
def_bool y
depends on X86_MCE_INTEL
source "arch/x86/events/Kconfig"
config X86_LEGACY_VM86
bool "Legacy VM86 support"
default n
@ -1210,15 +1208,6 @@ config MICROCODE_OLD_INTERFACE
def_bool y
depends on MICROCODE
config PERF_EVENTS_AMD_POWER
depends on PERF_EVENTS && CPU_SUP_AMD
tristate "AMD Processor Power Reporting Mechanism"
---help---
Provide power reporting mechanism support for AMD processors.
Currently, it leverages X86_FEATURE_ACC_POWER
(CPUID Fn8000_0007_EDX[12]) interface to calculate the
average power consumption on Family 15h processors.
config X86_MSR
tristate "/dev/cpu/*/msr - Model-specific register support"
---help---
@ -1932,54 +1921,38 @@ config RELOCATABLE
(CONFIG_PHYSICAL_START) is used as the minimum location.
config RANDOMIZE_BASE
bool "Randomize the address of the kernel image"
bool "Randomize the address of the kernel image (KASLR)"
depends on RELOCATABLE
default n
---help---
Randomizes the physical and virtual address at which the
kernel image is decompressed, as a security feature that
deters exploit attempts relying on knowledge of the location
of kernel internals.
In support of Kernel Address Space Layout Randomization (KASLR),
this randomizes the physical address at which the kernel image
is decompressed and the virtual address where the kernel
image is mapped, as a security feature that deters exploit
attempts relying on knowledge of the location of kernel
code internals.
Entropy is generated using the RDRAND instruction if it is
supported. If RDTSC is supported, it is used as well. If
neither RDRAND nor RDTSC are supported, then randomness is
read from the i8254 timer.
The kernel physical and virtual address can be randomized
from 16MB up to 1GB on 64-bit and 512MB on 32-bit. (Note that
using RANDOMIZE_BASE reduces the memory space available to
kernel modules from 1.5GB to 1GB.)
The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET,
and aligned according to PHYSICAL_ALIGN. Since the kernel is
built using 2GiB addressing, and PHYSICAL_ALGIN must be at a
minimum of 2MiB, only 10 bits of entropy is theoretically
possible. At best, due to page table layouts, 64-bit can use
9 bits of entropy and 32-bit uses 8 bits.
Entropy is generated using the RDRAND instruction if it is
supported. If RDTSC is supported, its value is mixed into
the entropy pool as well. If neither RDRAND nor RDTSC are
supported, then entropy is read from the i8254 timer.
If unsure, say N.
Since the kernel is built using 2GB addressing, and
PHYSICAL_ALIGN must be at a minimum of 2MB, only 10 bits of
entropy is theoretically possible. Currently, with the
default value for PHYSICAL_ALIGN and due to page table
layouts, 64-bit uses 9 bits of entropy and 32-bit uses 8 bits.
config RANDOMIZE_BASE_MAX_OFFSET
hex "Maximum kASLR offset allowed" if EXPERT
depends on RANDOMIZE_BASE
range 0x0 0x20000000 if X86_32
default "0x20000000" if X86_32
range 0x0 0x40000000 if X86_64
default "0x40000000" if X86_64
---help---
The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical
memory is used to determine the maximal offset in bytes that will
be applied to the kernel when kernel Address Space Layout
Randomization (kASLR) is active. This must be a multiple of
PHYSICAL_ALIGN.
If CONFIG_HIBERNATE is also enabled, KASLR is disabled at boot
time. To enable it, boot with "kaslr" on the kernel command
line (which will also disable hibernation).
On 32-bit this is limited to 512MiB by page table layouts. The
default is 512MiB.
On 64-bit this is limited by how the kernel fixmap page table is
positioned, so this cannot be larger than 1GiB currently. Without
RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel
and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the
modules area will shrink to compensate, up to the current maximum
1GiB to 1GiB split. The default is 1GiB.
If unsure, leave at the default value.
If unsure, say N.
# Relocation on x86 needs some additional build support
config X86_NEED_RELOCS

3
arch/x86/Makefile
View File

@ -208,7 +208,8 @@ endif
head-y := arch/x86/kernel/head_$(BITS).o
head-y += arch/x86/kernel/head$(BITS).o
head-y += arch/x86/kernel/head.o
head-y += arch/x86/kernel/ebda.o
head-y += arch/x86/kernel/platform-quirks.o
libs-y += arch/x86/lib/

13
arch/x86/boot/Makefile
View File

@ -86,16 +86,7 @@ $(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
SETUP_OBJS = $(addprefix $(obj)/,$(setup-y))
sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|_end\)$$/\#define VO_\2 0x\1/p'
quiet_cmd_voffset = VOFFSET $@
cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
targets += voffset.h
$(obj)/voffset.h: vmlinux FORCE
$(call if_changed,voffset)
sed-zoffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(startup_32\|startup_64\|efi32_stub_entry\|efi64_stub_entry\|efi_pe_entry\|input_data\|_end\|z_.*\)$$/\#define ZO_\2 0x\1/p'
sed-zoffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(startup_32\|startup_64\|efi32_stub_entry\|efi64_stub_entry\|efi_pe_entry\|input_data\|_end\|_ehead\|_text\|z_.*\)$$/\#define ZO_\2 0x\1/p'
quiet_cmd_zoffset = ZOFFSET $@
cmd_zoffset = $(NM) $< | sed -n $(sed-zoffset) > $@
@ -106,7 +97,7 @@ $(obj)/zoffset.h: $(obj)/compressed/vmlinux FORCE
AFLAGS_header.o += -I$(obj)
$(obj)/header.o: $(obj)/voffset.h $(obj)/zoffset.h
$(obj)/header.o: $(obj)/zoffset.h
LDFLAGS_setup.elf := -T
$(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE

23
arch/x86/boot/compressed/Makefile
View File

@ -57,12 +57,27 @@ LDFLAGS_vmlinux := -T
hostprogs-y := mkpiggy
HOST_EXTRACFLAGS += -I$(srctree)/tools/include
sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
quiet_cmd_voffset = VOFFSET $@
cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
targets += ../voffset.h
$(obj)/../voffset.h: vmlinux FORCE
$(call if_changed,voffset)
$(obj)/misc.o: $(obj)/../voffset.h
vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
$(obj)/string.o $(obj)/cmdline.o \
$(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
$(obj)/piggy.o $(obj)/cpuflags.o
vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/aslr.o
vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
ifdef CONFIG_X86_64
vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/pagetable.o
endif
$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
@ -109,10 +124,8 @@ suffix-$(CONFIG_KERNEL_XZ) := xz
suffix-$(CONFIG_KERNEL_LZO) := lzo
suffix-$(CONFIG_KERNEL_LZ4) := lz4
RUN_SIZE = $(shell $(OBJDUMP) -h vmlinux | \
$(CONFIG_SHELL) $(srctree)/arch/x86/tools/calc_run_size.sh)
quiet_cmd_mkpiggy = MKPIGGY $@
cmd_mkpiggy = $(obj)/mkpiggy $< $(RUN_SIZE) > $@ || ( rm -f $@ ; false )
cmd_mkpiggy = $(obj)/mkpiggy $< > $@ || ( rm -f $@ ; false )
targets += piggy.S
$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE

339
arch/x86/boot/compressed/aslr.c
View File

@ -1,339 +0,0 @@
#include "misc.h"
#include <asm/msr.h>
#include <asm/archrandom.h>
#include <asm/e820.h>
#include <generated/compile.h>
#include <linux/module.h>
#include <linux/uts.h>
#include <linux/utsname.h>
#include <generated/utsrelease.h>
/* Simplified build-specific string for starting entropy. */
static const char build_str[] = UTS_RELEASE " (" LINUX_COMPILE_BY "@"
LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION;
#define I8254_PORT_CONTROL 0x43
#define I8254_PORT_COUNTER0 0x40
#define I8254_CMD_READBACK 0xC0
#define I8254_SELECT_COUNTER0 0x02
#define I8254_STATUS_NOTREADY 0x40
static inline u16 i8254(void)
{
u16 status, timer;
do {
outb(I8254_PORT_CONTROL,
I8254_CMD_READBACK | I8254_SELECT_COUNTER0);
status = inb(I8254_PORT_COUNTER0);
timer = inb(I8254_PORT_COUNTER0);
timer |= inb(I8254_PORT_COUNTER0) << 8;
} while (status & I8254_STATUS_NOTREADY);
return timer;
}
static unsigned long rotate_xor(unsigned long hash, const void *area,
size_t size)
{
size_t i;
unsigned long *ptr = (unsigned long *)area;
for (i = 0; i < size / sizeof(hash); i++) {
/* Rotate by odd number of bits and XOR. */
hash = (hash << ((sizeof(hash) * 8) - 7)) | (hash >> 7);
hash ^= ptr[i];
}
return hash;
}
/* Attempt to create a simple but unpredictable starting entropy. */
static unsigned long get_random_boot(void)
{
unsigned long hash = 0;
hash = rotate_xor(hash, build_str, sizeof(build_str));
hash = rotate_xor(hash, real_mode, sizeof(*real_mode));
return hash;
}
static unsigned long get_random_long(void)
{
#ifdef CONFIG_X86_64
const unsigned long mix_const = 0x5d6008cbf3848dd3UL;
#else
const unsigned long mix_const = 0x3f39e593UL;
#endif
unsigned long raw, random = get_random_boot();
bool use_i8254 = true;
debug_putstr("KASLR using");
if (has_cpuflag(X86_FEATURE_RDRAND)) {
debug_putstr(" RDRAND");
if (rdrand_long(&raw)) {
random ^= raw;
use_i8254 = false;
}
}
if (has_cpuflag(X86_FEATURE_TSC)) {
debug_putstr(" RDTSC");
raw = rdtsc();
random ^= raw;
use_i8254 = false;
}
if (use_i8254) {
debug_putstr(" i8254");
random ^= i8254();
}
/* Circular multiply for better bit diffusion */
asm("mul %3"
: "=a" (random), "=d" (raw)
: "a" (random), "rm" (mix_const));
random += raw;
debug_putstr("...\n");
return random;
}
struct mem_vector {
unsigned long start;
unsigned long size;
};
#define MEM_AVOID_MAX 5
static struct mem_vector mem_avoid[MEM_AVOID_MAX];
static bool mem_contains(struct mem_vector *region, struct mem_vector *item)
{
/* Item at least partially before region. */
if (item->start < region->start)
return false;
/* Item at least partially after region. */
if (item->start + item->size > region->start + region->size)
return false;
return true;
}
static bool mem_overlaps(struct mem_vector *one, struct mem_vector *two)
{
/* Item one is entirely before item two. */
if (one->start + one->size <= two->start)
return false;
/* Item one is entirely after item two. */
if (one->start >= two->start + two->size)
return false;
return true;
}
static void mem_avoid_init(unsigned long input, unsigned long input_size,
unsigned long output, unsigned long output_size)
{
u64 initrd_start, initrd_size;
u64 cmd_line, cmd_line_size;
unsigned long unsafe, unsafe_len;
char *ptr;
/*
* Avoid the region that is unsafe to overlap during
* decompression (see calculations at top of misc.c).
*/
unsafe_len = (output_size >> 12) + 32768 + 18;
unsafe = (unsigned long)input + input_size - unsafe_len;
mem_avoid[0].start = unsafe;
mem_avoid[0].size = unsafe_len;
/* Avoid initrd. */
initrd_start = (u64)real_mode->ext_ramdisk_image << 32;
initrd_start |= real_mode->hdr.ramdisk_image;
initrd_size = (u64)real_mode->ext_ramdisk_size << 32;
initrd_size |= real_mode->hdr.ramdisk_size;
mem_avoid[1].start = initrd_start;
mem_avoid[1].size = initrd_size;
/* Avoid kernel command line. */
cmd_line = (u64)real_mode->ext_cmd_line_ptr << 32;
cmd_line |= real_mode->hdr.cmd_line_ptr;
/* Calculate size of cmd_line. */
ptr = (char *)(unsigned long)cmd_line;
for (cmd_line_size = 0; ptr[cmd_line_size++]; )
;
mem_avoid[2].start = cmd_line;
mem_avoid[2].size = cmd_line_size;
/* Avoid heap memory. */
mem_avoid[3].start = (unsigned long)free_mem_ptr;
mem_avoid[3].size = BOOT_HEAP_SIZE;
/* Avoid stack memory. */
mem_avoid[4].start = (unsigned long)free_mem_end_ptr;
mem_avoid[4].size = BOOT_STACK_SIZE;
}
/* Does this memory vector overlap a known avoided area? */
static bool mem_avoid_overlap(struct mem_vector *img)
{
int i;
struct setup_data *ptr;
for (i = 0; i < MEM_AVOID_MAX; i++) {
if (mem_overlaps(img, &mem_avoid[i]))
return true;
}
/* Avoid all entries in the setup_data linked list. */
ptr = (struct setup_data *)(unsigned long)real_mode->hdr.setup_data;
while (ptr) {
struct mem_vector avoid;
avoid.start = (unsigned long)ptr;
avoid.size = sizeof(*ptr) + ptr->len;
if (mem_overlaps(img, &avoid))
return true;
ptr = (struct setup_data *)(unsigned long)ptr->next;
}
return false;
}
static unsigned long slots[CONFIG_RANDOMIZE_BASE_MAX_OFFSET /
CONFIG_PHYSICAL_ALIGN];
static unsigned long slot_max;
static void slots_append(unsigned long addr)
{
/* Overflowing the slots list should be impossible. */
if (slot_max >= CONFIG_RANDOMIZE_BASE_MAX_OFFSET /
CONFIG_PHYSICAL_ALIGN)
return;
slots[slot_max++] = addr;
}
static unsigned long slots_fetch_random(void)
{
/* Handle case of no slots stored. */
if (slot_max == 0)
return 0;
return slots[get_random_long() % slot_max];
}
static void process_e820_entry(struct e820entry *entry,
unsigned long minimum,
unsigned long image_size)
{
struct mem_vector region, img;
/* Skip non-RAM entries. */
if (entry->type != E820_RAM)
return;
/* Ignore entries entirely above our maximum. */
if (entry->addr >= CONFIG_RANDOMIZE_BASE_MAX_OFFSET)
return;
/* Ignore entries entirely below our minimum. */
if (entry->addr + entry->size < minimum)
return;
region.start = entry->addr;
region.size = entry->size;
/* Potentially raise address to minimum location. */
if (region.start < minimum)
region.start = minimum;
/* Potentially raise address to meet alignment requirements. */
region.start = ALIGN(region.start, CONFIG_PHYSICAL_ALIGN);
/* Did we raise the address above the bounds of this e820 region? */
if (region.start > entry->addr + entry->size)
return;
/* Reduce size by any delta from the original address. */
region.size -= region.start - entry->addr;
/* Reduce maximum size to fit end of image within maximum limit. */
if (region.start + region.size > CONFIG_RANDOMIZE_BASE_MAX_OFFSET)
region.size = CONFIG_RANDOMIZE_BASE_MAX_OFFSET - region.start;
/* Walk each aligned slot and check for avoided areas. */
for (img.start = region.start, img.size = image_size ;
mem_contains(&region, &img) ;
img.start += CONFIG_PHYSICAL_ALIGN) {
if (mem_avoid_overlap(&img))
continue;
slots_append(img.start);
}
}
static unsigned long find_random_addr(unsigned long minimum,
unsigned long size)
{
int i;
unsigned long addr;
/* Make sure minimum is aligned. */
minimum = ALIGN(minimum, CONFIG_PHYSICAL_ALIGN);
/* Verify potential e820 positions, appending to slots list. */
for (i = 0; i < real_mode->e820_entries; i++) {
process_e820_entry(&real_mode->e820_map[i], minimum, size);
}
return slots_fetch_random();
}
unsigned char *choose_kernel_location(struct boot_params *boot_params,
unsigned char *input,
unsigned long input_size,
unsigned char *output,
unsigned long output_size)
{
unsigned long choice = (unsigned long)output;
unsigned long random;
#ifdef CONFIG_HIBERNATION
if (!cmdline_find_option_bool("kaslr")) {
debug_putstr("KASLR disabled by default...\n");
goto out;
}
#else
if (cmdline_find_option_bool("nokaslr")) {
debug_putstr("KASLR disabled by cmdline...\n");
goto out;
}
#endif
boot_params->hdr.loadflags |= KASLR_FLAG;
/* Record the various known unsafe memory ranges. */
mem_avoid_init((unsigned long)input, input_size,
(unsigned long)output, output_size);
/* Walk e820 and find a random address. */
random = find_random_addr(choice, output_size);
if (!random) {
debug_putstr("KASLR could not find suitable E820 region...\n");
goto out;
}
/* Always enforce the minimum. */
if (random < choice)
goto out;
choice = random;
out:
return (unsigned char *)choice;
}

4
arch/x86/boot/compressed/cmdline.c
View File

@ -15,9 +15,9 @@ static inline char rdfs8(addr_t addr)
#include "../cmdline.c"
static unsigned long get_cmd_line_ptr(void)
{
unsigned long cmd_line_ptr = real_mode->hdr.cmd_line_ptr;
unsigned long cmd_line_ptr = boot_params->hdr.cmd_line_ptr;
cmd_line_ptr |= (u64)real_mode->ext_cmd_line_ptr << 32;
cmd_line_ptr |= (u64)boot_params->ext_cmd_line_ptr << 32;
return cmd_line_ptr;
}

308
arch/x86/boot/compressed/eboot.c
View File

@ -571,312 +571,6 @@ static void setup_efi_pci(struct boot_params *params)
efi_call_early(free_pool, pci_handle);
}
static void
setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
struct efi_pixel_bitmask pixel_info, int pixel_format)
{
if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
si->lfb_depth = 32;
si->lfb_linelength = pixels_per_scan_line * 4;
si->red_size = 8;
si->red_pos = 0;
si->green_size = 8;
si->green_pos = 8;
si->blue_size = 8;
si->blue_pos = 16;
si->rsvd_size = 8;
si->rsvd_pos = 24;
} else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
si->lfb_depth = 32;
si->lfb_linelength = pixels_per_scan_line * 4;
si->red_size = 8;
si->red_pos = 16;
si->green_size = 8;
si->green_pos = 8;
si->blue_size = 8;
si->blue_pos = 0;
si->rsvd_size = 8;
si->rsvd_pos = 24;
} else if (pixel_format == PIXEL_BIT_MASK) {
find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
find_bits(pixel_info.green_mask, &si->green_pos,
&si->green_size);
find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
&si->rsvd_size);
si->lfb_depth = si->red_size + si->green_size +
si->blue_size + si->rsvd_size;
si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
} else {
si->lfb_depth = 4;
si->lfb_linelength = si->lfb_width / 2;
si->red_size = 0;
si->red_pos = 0;
si->green_size = 0;
si->green_pos = 0;
si->blue_size = 0;
si->blue_pos = 0;
si->rsvd_size = 0;
si->rsvd_pos = 0;
}
}
static efi_status_t
__gop_query32(struct efi_graphics_output_protocol_32 *gop32,
struct efi_graphics_output_mode_info **info,
unsigned long *size, u64 *fb_base)
{
struct efi_graphics_output_protocol_mode_32 *mode;
efi_status_t status;
unsigned long m;
m = gop32->mode;
mode = (struct efi_graphics_output_protocol_mode_32 *)m;
status = efi_early->call(gop32->query_mode, gop32,
mode->mode, size, info);
if (status != EFI_SUCCESS)
return status;
*fb_base = mode->frame_buffer_base;
return status;
}
static efi_status_t
setup_gop32(struct screen_info *si, efi_guid_t *proto,
unsigned long size, void **gop_handle)
{
struct efi_graphics_output_protocol_32 *gop32, *first_gop;
unsigned long nr_gops;
u16 width, height;
u32 pixels_per_scan_line;
u32 ext_lfb_base;
u64 fb_base;
struct efi_pixel_bitmask pixel_info;
int pixel_format;
efi_status_t status;
u32 *handles = (u32 *)(unsigned long)gop_handle;
int i;
first_gop = NULL;
gop32 = NULL;
nr_gops = size / sizeof(u32);
for (i = 0; i < nr_gops; i++) {
struct efi_graphics_output_mode_info *info = NULL;
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
bool conout_found = false;
void *dummy = NULL;
u32 h = handles[i];
u64 current_fb_base;
status = efi_call_early(handle_protocol, h,
proto, (void **)&gop32);
if (status != EFI_SUCCESS)
continue;
status = efi_call_early(handle_protocol, h,
&conout_proto, &dummy);
if (status == EFI_SUCCESS)
conout_found = true;
status = __gop_query32(gop32, &info, &size, &current_fb_base);
if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
/*
* Systems that use the UEFI Console Splitter may
* provide multiple GOP devices, not all of which are
* backed by real hardware. The workaround is to search
* for a GOP implementing the ConOut protocol, and if
* one isn't found, to just fall back to the first GOP.
*/
width = info->horizontal_resolution;
height = info->vertical_resolution;
pixel_format = info->pixel_format;
pixel_info = info->pixel_information;
pixels_per_scan_line = info->pixels_per_scan_line;
fb_base = current_fb_base;
/*
* Once we've found a GOP supporting ConOut,
* don't bother looking any further.
*/
first_gop = gop32;
if (conout_found)
break;
}
}
/* Did we find any GOPs? */
if (!first_gop)
goto out;
/* EFI framebuffer */
si->orig_video_isVGA = VIDEO_TYPE_EFI;
si->lfb_width = width;
si->lfb_height = height;
si->lfb_base = fb_base;
ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
if (ext_lfb_base) {
si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
si->ext_lfb_base = ext_lfb_base;
}
si->pages = 1;
setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
si->lfb_size = si->lfb_linelength * si->lfb_height;
si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
out:
return status;
}
static efi_status_t
__gop_query64(struct efi_graphics_output_protocol_64 *gop64,
struct efi_graphics_output_mode_info **info,
unsigned long *size, u64 *fb_base)
{
struct efi_graphics_output_protocol_mode_64 *mode;
efi_status_t status;
unsigned long m;
m = gop64->mode;
mode = (struct efi_graphics_output_protocol_mode_64 *)m;
status = efi_early->call(gop64->query_mode, gop64,
mode->mode, size, info);
if (status != EFI_SUCCESS)
return status;
*fb_base = mode->frame_buffer_base;
return status;
}
static efi_status_t
setup_gop64(struct screen_info *si, efi_guid_t *proto,
unsigned long size, void **gop_handle)
{
struct efi_graphics_output_protocol_64 *gop64, *first_gop;
unsigned long nr_gops;
u16 width, height;
u32 pixels_per_scan_line;
u32 ext_lfb_base;
u64 fb_base;
struct efi_pixel_bitmask pixel_info;
int pixel_format;
efi_status_t status;
u64 *handles = (u64 *)(unsigned long)gop_handle;
int i;
first_gop = NULL;
gop64 = NULL;
nr_gops = size / sizeof(u64);
for (i = 0; i < nr_gops; i++) {
struct efi_graphics_output_mode_info *info = NULL;
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
bool conout_found = false;
void *dummy = NULL;
u64 h = handles[i];
u64 current_fb_base;
status = efi_call_early(handle_protocol, h,
proto, (void **)&gop64);
if (status != EFI_SUCCESS)
continue;
status = efi_call_early(handle_protocol, h,
&conout_proto, &dummy);
if (status == EFI_SUCCESS)
conout_found = true;
status = __gop_query64(gop64, &info, &size, &current_fb_base);
if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
/*
* Systems that use the UEFI Console Splitter may
* provide multiple GOP devices, not all of which are
* backed by real hardware. The workaround is to search
* for a GOP implementing the ConOut protocol, and if
* one isn't found, to just fall back to the first GOP.
*/
width = info->horizontal_resolution;
height = info->vertical_resolution;
pixel_format = info->pixel_format;
pixel_info = info->pixel_information;
pixels_per_scan_line = info->pixels_per_scan_line;
fb_base = current_fb_base;
/*
* Once we've found a GOP supporting ConOut,
* don't bother looking any further.
*/
first_gop = gop64;
if (conout_found)
break;
}
}
/* Did we find any GOPs? */
if (!first_gop)
goto out;
/* EFI framebuffer */
si->orig_video_isVGA = VIDEO_TYPE_EFI;
si->lfb_width = width;
si->lfb_height = height;
si->lfb_base = fb_base;
ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
if (ext_lfb_base) {
si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
si->ext_lfb_base = ext_lfb_base;
}
si->pages = 1;
setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
si->lfb_size = si->lfb_linelength * si->lfb_height;
si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
out:
return status;
}
/*
* See if we have Graphics Output Protocol
*/
static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
unsigned long size)
{
efi_status_t status;
void **gop_handle = NULL;
status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
size, (void **)&gop_handle);
if (status != EFI_SUCCESS)
return status;
status = efi_call_early(locate_handle,
EFI_LOCATE_BY_PROTOCOL,
proto, NULL, &size, gop_handle);
if (status != EFI_SUCCESS)
goto free_handle;
if (efi_early->is64)
status = setup_gop64(si, proto, size, gop_handle);
else
status = setup_gop32(si, proto, size, gop_handle);
free_handle:
efi_call_early(free_pool, gop_handle);
return status;
}
static efi_status_t
setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
{
@ -1038,7 +732,7 @@ void setup_graphics(struct boot_params *boot_params)
EFI_LOCATE_BY_PROTOCOL,
&graphics_proto, NULL, &size, gop_handle);
if (status == EFI_BUFFER_TOO_SMALL)
status = setup_gop(si, &graphics_proto, size);
status = efi_setup_gop(NULL, si, &graphics_proto, size);
if (status != EFI_SUCCESS) {
size = 0;

74
arch/x86/boot/compressed/eboot.h
View File

@ -11,80 +11,6 @@
#define DESC_TYPE_CODE_DATA (1 << 0)
#define EFI_CONSOLE_OUT_DEVICE_GUID \
EFI_GUID(0xd3b36f2c, 0xd551, 0x11d4, 0x9a, 0x46, 0x0, 0x90, 0x27, \
0x3f, 0xc1, 0x4d)
#define PIXEL_RGB_RESERVED_8BIT_PER_COLOR 0
#define PIXEL_BGR_RESERVED_8BIT_PER_COLOR 1
#define PIXEL_BIT_MASK 2
#define PIXEL_BLT_ONLY 3
#define PIXEL_FORMAT_MAX 4
struct efi_pixel_bitmask {
u32 red_mask;
u32 green_mask;
u32 blue_mask;
u32 reserved_mask;
};
struct efi_graphics_output_mode_info {
u32 version;
u32 horizontal_resolution;
u32 vertical_resolution;
int pixel_format;
struct efi_pixel_bitmask pixel_information;
u32 pixels_per_scan_line;
} __packed;
struct efi_graphics_output_protocol_mode_32 {
u32 max_mode;
u32 mode;
u32 info;
u32 size_of_info;
u64 frame_buffer_base;
u32 frame_buffer_size;
} __packed;
struct efi_graphics_output_protocol_mode_64 {
u32 max_mode;
u32 mode;
u64 info;
u64 size_of_info;
u64 frame_buffer_base;
u64 frame_buffer_size;
} __packed;
struct efi_graphics_output_protocol_mode {
u32 max_mode;
u32 mode;
unsigned long info;
unsigned long size_of_info;
u64 frame_buffer_base;
unsigned long frame_buffer_size;
} __packed;
struct efi_graphics_output_protocol_32 {
u32 query_mode;
u32 set_mode;
u32 blt;
u32 mode;
};
struct efi_graphics_output_protocol_64 {
u64 query_mode;
u64 set_mode;
u64 blt;
u64 mode;
};
struct efi_graphics_output_protocol {
void *query_mode;
unsigned long set_mode;
unsigned long blt;
struct efi_graphics_output_protocol_mode *mode;
};
struct efi_uga_draw_protocol_32 {
u32 get_mode;
u32 set_mode;

22
arch/x86/boot/compressed/error.c Normal file
View File

@ -0,0 +1,22 @@
/*
* Callers outside of misc.c need access to the error reporting routines,
* but the *_putstr() functions need to stay in misc.c because of how
* memcpy() and memmove() are defined for the compressed boot environment.
*/
#include "misc.h"
void warn(char *m)
{
error_putstr("\n\n");
error_putstr(m);
error_putstr("\n\n");
}
void error(char *m)
{
warn(m);
error_putstr(" -- System halted");
while (1)
asm("hlt");
}

7
arch/x86/boot/compressed/error.h Normal file
View File

@ -0,0 +1,7 @@
#ifndef BOOT_COMPRESSED_ERROR_H
#define BOOT_COMPRESSED_ERROR_H
void warn(char *m);
void error(char *m);
#endif /* BOOT_COMPRESSED_ERROR_H */

22
arch/x86/boot/compressed/head_32.S
View File

@ -176,7 +176,9 @@ preferred_addr:
1:
/* Target address to relocate to for decompression */
addl $z_extract_offset, %ebx
movl BP_init_size(%esi), %eax
subl $_end, %eax
addl %eax, %ebx
/* Set up the stack */
leal boot_stack_end(%ebx), %esp
@ -233,24 +235,28 @@ relocated:
2:
/*
* Do the decompression, and jump to the new kernel..
* Do the extraction, and jump to the new kernel..
*/
/* push arguments for decompress_kernel: */
pushl $z_run_size /* size of kernel with .bss and .brk */
/* push arguments for extract_kernel: */
pushl $z_output_len /* decompressed length, end of relocs */
leal z_extract_offset_negative(%ebx), %ebp
movl BP_init_size(%esi), %eax
subl $_end, %eax
movl %ebx, %ebp
subl %eax, %ebp
pushl %ebp /* output address */
pushl $z_input_len /* input_len */
leal input_data(%ebx), %eax
pushl %eax /* input_data */
leal boot_heap(%ebx), %eax
pushl %eax /* heap area */
pushl %esi /* real mode pointer */
call decompress_kernel /* returns kernel location in %eax */
addl $28, %esp
call extract_kernel /* returns kernel location in %eax */
addl $24, %esp
/*
* Jump to the decompressed kernel.
* Jump to the extracted kernel.
*/
xorl %ebx, %ebx
jmp *%eax

19
arch/x86/boot/compressed/head_64.S
View File

@ -110,7 +110,9 @@ ENTRY(startup_32)
1:
/* Target address to relocate to for decompression */
addl $z_extract_offset, %ebx
movl BP_init_size(%esi), %eax
subl $_end, %eax
addl %eax, %ebx
/*
* Prepare for entering 64 bit mode
@ -132,7 +134,7 @@ ENTRY(startup_32)
/* Initialize Page tables to 0 */
leal pgtable(%ebx), %edi
xorl %eax, %eax
movl $((4096*6)/4), %ecx
movl $(BOOT_INIT_PGT_SIZE/4), %ecx
rep stosl
/* Build Level 4 */
@ -338,7 +340,9 @@ preferred_addr:
1:
/* Target address to relocate to for decompression */
leaq z_extract_offset(%rbp), %rbx
movl BP_init_size(%rsi), %ebx
subl $_end, %ebx
addq %rbp, %rbx
/* Set up the stack */
leaq boot_stack_end(%rbx), %rsp
@ -408,19 +412,16 @@ relocated:
2:
/*
* Do the decompression, and jump to the new kernel..
* Do the extraction, and jump to the new kernel..
*/
pushq %rsi /* Save the real mode argument */
movq $z_run_size, %r9 /* size of kernel with .bss and .brk */
pushq %r9
movq %rsi, %rdi /* real mode address */
leaq boot_heap(%rip), %rsi /* malloc area for uncompression */
leaq input_data(%rip), %rdx /* input_data */
movl $z_input_len, %ecx /* input_len */
movq %rbp, %r8 /* output target address */
movq $z_output_len, %r9 /* decompressed length, end of relocs */
call decompress_kernel /* returns kernel location in %rax */
popq %r9
call extract_kernel /* returns kernel location in %rax */
popq %rsi
/*
@ -485,4 +486,4 @@ boot_stack_end:
.section ".pgtable","a",@nobits
.balign 4096
pgtable:
.fill 6*4096, 1, 0
.fill BOOT_PGT_SIZE, 1, 0

510
arch/x86/boot/compressed/kaslr.c Normal file
View File

@ -0,0 +1,510 @@
/*
* kaslr.c
*
* This contains the routines needed to generate a reasonable level of
* entropy to choose a randomized kernel base address offset in support
* of Kernel Address Space Layout Randomization (KASLR). Additionally
* handles walking the physical memory maps (and tracking memory regions
* to avoid) in order to select a physical memory location that can
* contain the entire properly aligned running kernel image.
*
*/
#include "misc.h"
#include "error.h"
#include <asm/msr.h>
#include <asm/archrandom.h>
#include <asm/e820.h>
#include <generated/compile.h>
#include <linux/module.h>
#include <linux/uts.h>
#include <linux/utsname.h>
#include <generated/utsrelease.h>
/* Simplified build-specific string for starting entropy. */
static const char build_str[] = UTS_RELEASE " (" LINUX_COMPILE_BY "@"
LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION;
#define I8254_PORT_CONTROL 0x43
#define I8254_PORT_COUNTER0 0x40
#define I8254_CMD_READBACK 0xC0
#define I8254_SELECT_COUNTER0 0x02
#define I8254_STATUS_NOTREADY 0x40
static inline u16 i8254(void)
{
u16 status, timer;
do {
outb(I8254_PORT_CONTROL,
I8254_CMD_READBACK | I8254_SELECT_COUNTER0);
status = inb(I8254_PORT_COUNTER0);
timer = inb(I8254_PORT_COUNTER0);
timer |= inb(I8254_PORT_COUNTER0) << 8;
} while (status & I8254_STATUS_NOTREADY);
return timer;
}
static unsigned long rotate_xor(unsigned long hash, const void *area,
size_t size)
{
size_t i;
unsigned long *ptr = (unsigned long *)area;
for (i = 0; i < size / sizeof(hash); i++) {
/* Rotate by odd number of bits and XOR. */
hash = (hash << ((sizeof(hash) * 8) - 7)) | (hash >> 7);
hash ^= ptr[i];
}
return hash;
}
/* Attempt to create a simple but unpredictable starting entropy. */
static unsigned long get_random_boot(void)
{
unsigned long hash = 0;
hash = rotate_xor(hash, build_str, sizeof(build_str));
hash = rotate_xor(hash, boot_params, sizeof(*boot_params));
return hash;
}
static unsigned long get_random_long(const char *purpose)
{
#ifdef CONFIG_X86_64
const unsigned long mix_const = 0x5d6008cbf3848dd3UL;
#else
const unsigned long mix_const = 0x3f39e593UL;
#endif
unsigned long raw, random = get_random_boot();
bool use_i8254 = true;
debug_putstr(purpose);
debug_putstr(" KASLR using");
if (has_cpuflag(X86_FEATURE_RDRAND)) {
debug_putstr(" RDRAND");
if (rdrand_long(&raw)) {
random ^= raw;
use_i8254 = false;
}
}
if (has_cpuflag(X86_FEATURE_TSC)) {
debug_putstr(" RDTSC");
raw = rdtsc();
random ^= raw;
use_i8254 = false;
}
if (use_i8254) {
debug_putstr(" i8254");
random ^= i8254();
}
/* Circular multiply for better bit diffusion */
asm("mul %3"
: "=a" (random), "=d" (raw)
: "a" (random), "rm" (mix_const));
random += raw;
debug_putstr("...\n");
return random;
}
struct mem_vector {
unsigned long start;
unsigned long size;
};
enum mem_avoid_index {
MEM_AVOID_ZO_RANGE = 0,
MEM_AVOID_INITRD,
MEM_AVOID_CMDLINE,
MEM_AVOID_BOOTPARAMS,
MEM_AVOID_MAX,
};
static struct mem_vector mem_avoid[MEM_AVOID_MAX];
static bool mem_contains(struct mem_vector *region, struct mem_vector *item)
{
/* Item at least partially before region. */
if (item->start < region->start)
return false;
/* Item at least partially after region. */
if (item->start + item->size > region->start + region->size)
return false;
return true;
}
static bool mem_overlaps(struct mem_vector *one, struct mem_vector *two)
{
/* Item one is entirely before item two. */
if (one->start + one->size <= two->start)
return false;
/* Item one is entirely after item two. */
if (one->start >= two->start + two->size)
return false;
return true;
}
/*
* In theory, KASLR can put the kernel anywhere in the range of [16M, 64T).
* The mem_avoid array is used to store the ranges that need to be avoided
* when KASLR searches for an appropriate random address. We must avoid any
* regions that are unsafe to overlap with during decompression, and other
* things like the initrd, cmdline and boot_params. This comment seeks to
* explain mem_avoid as clearly as possible since incorrect mem_avoid
* memory ranges lead to really hard to debug boot failures.
*
* The initrd, cmdline, and boot_params are trivial to identify for
* avoiding. They are MEM_AVOID_INITRD, MEM_AVOID_CMDLINE, and
* MEM_AVOID_BOOTPARAMS respectively below.
*
* What is not obvious how to avoid is the range of memory that is used
* during decompression (MEM_AVOID_ZO_RANGE below). This range must cover
* the compressed kernel (ZO) and its run space, which is used to extract
* the uncompressed kernel (VO) and relocs.
*
* ZO's full run size sits against the end of the decompression buffer, so
* we can calculate where text, data, bss, etc of ZO are positioned more
* easily.
*
* For additional background, the decompression calculations can be found
* in header.S, and the memory diagram is based on the one found in misc.c.
*
* The following conditions are already enforced by the image layouts and
* associated code:
* - input + input_size >= output + output_size
* - kernel_total_size <= init_size
* - kernel_total_size <= output_size (see Note below)
* - output + init_size >= output + output_size
*
* (Note that kernel_total_size and output_size have no fundamental
* relationship, but output_size is passed to choose_random_location
* as a maximum of the two. The diagram is showing a case where
* kernel_total_size is larger than output_size, but this case is
* handled by bumping output_size.)
*
* The above conditions can be illustrated by a diagram:
*
* 0 output input input+input_size output+init_size
* | | | | |
* | | | | |
* |-----|--------|--------|--------------|-----------|--|-------------|
* | | |
* | | |
* output+init_size-ZO_INIT_SIZE output+output_size output+kernel_total_size
*
* [output, output+init_size) is the entire memory range used for
* extracting the compressed image.
*
* [output, output+kernel_total_size) is the range needed for the
* uncompressed kernel (VO) and its run size (bss, brk, etc).
*
* [output, output+output_size) is VO plus relocs (i.e. the entire
* uncompressed payload contained by ZO). This is the area of the buffer
* written to during decompression.
*
* [output+init_size-ZO_INIT_SIZE, output+init_size) is the worst-case
* range of the copied ZO and decompression code. (i.e. the range
* covered backwards of size ZO_INIT_SIZE, starting from output+init_size.)
*
* [input, input+input_size) is the original copied compressed image (ZO)
* (i.e. it does not include its run size). This range must be avoided
* because it contains the data used for decompression.
*
* [input+input_size, output+init_size) is [_text, _end) for ZO. This
* range includes ZO's heap and stack, and must be avoided since it
* performs the decompression.
*
* Since the above two ranges need to be avoided and they are adjacent,
* they can be merged, resulting in: [input, output+init_size) which
* becomes the MEM_AVOID_ZO_RANGE below.
*/
static void mem_avoid_init(unsigned long input, unsigned long input_size,
unsigned long output)
{
unsigned long init_size = boot_params->hdr.init_size;
u64 initrd_start, initrd_size;
u64 cmd_line, cmd_line_size;
char *ptr;
/*
* Avoid the region that is unsafe to overlap during
* decompression.
*/
mem_avoid[MEM_AVOID_ZO_RANGE].start = input;
mem_avoid[MEM_AVOID_ZO_RANGE].size = (output + init_size) - input;
add_identity_map(mem_avoid[MEM_AVOID_ZO_RANGE].start,
mem_avoid[MEM_AVOID_ZO_RANGE].size);
/* Avoid initrd. */
initrd_start = (u64)boot_params->ext_ramdisk_image << 32;
initrd_start |= boot_params->hdr.ramdisk_image;
initrd_size = (u64)boot_params->ext_ramdisk_size << 32;
initrd_size |= boot_params->hdr.ramdisk_size;
mem_avoid[MEM_AVOID_INITRD].start = initrd_start;
mem_avoid[MEM_AVOID_INITRD].size = initrd_size;
/* No need to set mapping for initrd, it will be handled in VO. */
/* Avoid kernel command line. */
cmd_line = (u64)boot_params->ext_cmd_line_ptr << 32;
cmd_line |= boot_params->hdr.cmd_line_ptr;
/* Calculate size of cmd_line. */
ptr = (char *)(unsigned long)cmd_line;
for (cmd_line_size = 0; ptr[cmd_line_size++]; )
;
mem_avoid[MEM_AVOID_CMDLINE].start = cmd_line;
mem_avoid[MEM_AVOID_CMDLINE].size = cmd_line_size;
add_identity_map(mem_avoid[MEM_AVOID_CMDLINE].start,
mem_avoid[MEM_AVOID_CMDLINE].size);
/* Avoid boot parameters. */
mem_avoid[MEM_AVOID_BOOTPARAMS].start = (unsigned long)boot_params;
mem_avoid[MEM_AVOID_BOOTPARAMS].size = sizeof(*boot_params);
add_identity_map(mem_avoid[MEM_AVOID_BOOTPARAMS].start,
mem_avoid[MEM_AVOID_BOOTPARAMS].size);
/* We don't need to set a mapping for setup_data. */
#ifdef CONFIG_X86_VERBOSE_BOOTUP
/* Make sure video RAM can be used. */
add_identity_map(0, PMD_SIZE);
#endif
}
/*
* Does this memory vector overlap a known avoided area? If so, record the
* overlap region with the lowest address.
*/
static bool mem_avoid_overlap(struct mem_vector *img,
struct mem_vector *overlap)
{
int i;
struct setup_data *ptr;
unsigned long earliest = img->start + img->size;
bool is_overlapping = false;
for (i = 0; i < MEM_AVOID_MAX; i++) {
if (mem_overlaps(img, &mem_avoid[i]) &&
mem_avoid[i].start < earliest) {
*overlap = mem_avoid[i];
is_overlapping = true;
}
}
/* Avoid all entries in the setup_data linked list. */
ptr = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
while (ptr) {
struct mem_vector avoid;
avoid.start = (unsigned long)ptr;
avoid.size = sizeof(*ptr) + ptr->len;
if (mem_overlaps(img, &avoid) && (avoid.start < earliest)) {
*overlap = avoid;
is_overlapping = true;
}
ptr = (struct setup_data *)(unsigned long)ptr->next;
}
return is_overlapping;
}
static unsigned long slots[KERNEL_IMAGE_SIZE / CONFIG_PHYSICAL_ALIGN];
struct slot_area {
unsigned long addr;
int num;
};
#define MAX_SLOT_AREA 100
static struct slot_area slot_areas[MAX_SLOT_AREA];
static unsigned long slot_max;
static unsigned long slot_area_index;
static void store_slot_info(struct mem_vector *region, unsigned long image_size)
{
struct slot_area slot_area;
if (slot_area_index == MAX_SLOT_AREA)
return;
slot_area.addr = region->start;
slot_area.num = (region->size - image_size) /
CONFIG_PHYSICAL_ALIGN + 1;
if (slot_area.num > 0) {
slot_areas[slot_area_index++] = slot_area;
slot_max += slot_area.num;
}
}
static void slots_append(unsigned long addr)
{
/* Overflowing the slots list should be impossible. */
if (slot_max >= KERNEL_IMAGE_SIZE / CONFIG_PHYSICAL_ALIGN)
return;
slots[slot_max++] = addr;
}
static unsigned long slots_fetch_random(void)
{
/* Handle case of no slots stored. */
if (slot_max == 0)
return 0;
return slots[get_random_long("Physical") % slot_max];
}
static void process_e820_entry(struct e820entry *entry,
unsigned long minimum,
unsigned long image_size)
{
struct mem_vector region, img, overlap;
/* Skip non-RAM entries. */
if (entry->type != E820_RAM)
return;
/* Ignore entries entirely above our maximum. */
if (entry->addr >= KERNEL_IMAGE_SIZE)
return;
/* Ignore entries entirely below our minimum. */
if (entry->addr + entry->size < minimum)
return;
region.start = entry->addr;
region.size = entry->size;
/* Potentially raise address to minimum location. */
if (region.start < minimum)
region.start = minimum;
/* Potentially raise address to meet alignment requirements. */
region.start = ALIGN(region.start, CONFIG_PHYSICAL_ALIGN);
/* Did we raise the address above the bounds of this e820 region? */
if (region.start > entry->addr + entry->size)
return;
/* Reduce size by any delta from the original address. */
region.size -= region.start - entry->addr;
/* Reduce maximum size to fit end of image within maximum limit. */
if (region.start + region.size > KERNEL_IMAGE_SIZE)
region.size = KERNEL_IMAGE_SIZE - region.start;
/* Walk each aligned slot and check for avoided areas. */
for (img.start = region.start, img.size = image_size ;
mem_contains(&region, &img) ;
img.start += CONFIG_PHYSICAL_ALIGN) {
if (mem_avoid_overlap(&img, &overlap))
continue;
slots_append(img.start);
}
}
static unsigned long find_random_phys_addr(unsigned long minimum,
unsigned long image_size)
{
int i;
unsigned long addr;
/* Make sure minimum is aligned. */
minimum = ALIGN(minimum, CONFIG_PHYSICAL_ALIGN);
/* Verify potential e820 positions, appending to slots list. */
for (i = 0; i < boot_params->e820_entries; i++) {
process_e820_entry(&boot_params->e820_map[i], minimum,
image_size);
}
return slots_fetch_random();
}
static unsigned long find_random_virt_addr(unsigned long minimum,
unsigned long image_size)
{
unsigned long slots, random_addr;
/* Make sure minimum is aligned. */
minimum = ALIGN(minimum, CONFIG_PHYSICAL_ALIGN);
/* Align image_size for easy slot calculations. */
image_size = ALIGN(image_size, CONFIG_PHYSICAL_ALIGN);
/*
* There are how many CONFIG_PHYSICAL_ALIGN-sized slots
* that can hold image_size within the range of minimum to
* KERNEL_IMAGE_SIZE?
*/
slots = (KERNEL_IMAGE_SIZE - minimum - image_size) /
CONFIG_PHYSICAL_ALIGN + 1;
random_addr = get_random_long("Virtual") % slots;
return random_addr * CONFIG_PHYSICAL_ALIGN + minimum;
}
/*
* Since this function examines addresses much more numerically,
* it takes the input and output pointers as 'unsigned long'.
*/
unsigned char *choose_random_location(unsigned long input,
unsigned long input_size,
unsigned long output,
unsigned long output_size)
{
unsigned long choice = output;
unsigned long random_addr;
#ifdef CONFIG_HIBERNATION
if (!cmdline_find_option_bool("kaslr")) {
warn("KASLR disabled: 'kaslr' not on cmdline (hibernation selected).");
goto out;
}
#else
if (cmdline_find_option_bool("nokaslr")) {
warn("KASLR disabled: 'nokaslr' on cmdline.");
goto out;
}
#endif
boot_params->hdr.loadflags |= KASLR_FLAG;
/* Record the various known unsafe memory ranges. */
mem_avoid_init(input, input_size, output);
/* Walk e820 and find a random address. */
random_addr = find_random_phys_addr(output, output_size);
if (!random_addr) {
warn("KASLR disabled: could not find suitable E820 region!");
goto out;
}
/* Always enforce the minimum. */
if (random_addr < choice)
goto out;
choice = random_addr;
add_identity_map(choice, output_size);
/* This actually loads the identity pagetable on x86_64. */
finalize_identity_maps();
out:
return (unsigned char *)choice;
}

188
arch/x86/boot/compressed/misc.c
View File

@ -1,8 +1,10 @@
/*
* misc.c
*
* This is a collection of several routines from gzip-1.0.3
* adapted for Linux.
* This is a collection of several routines used to extract the kernel
* which includes KASLR relocation, decompression, ELF parsing, and
* relocation processing. Additionally included are the screen and serial
* output functions and related debugging support functions.
*
* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
* puts by Nick Holloway 1993, better puts by Martin Mares 1995
@ -10,111 +12,37 @@
*/
#include "misc.h"
#include "error.h"
#include "../string.h"
/* WARNING!!
* This code is compiled with -fPIC and it is relocated dynamically
* at run time, but no relocation processing is performed.
* This means that it is not safe to place pointers in static structures.
*/
#include "../voffset.h"
/*
* Getting to provable safe in place decompression is hard.
* Worst case behaviours need to be analyzed.
* Background information:
*
* The file layout is:
* magic[2]
* method[1]
* flags[1]
* timestamp[4]
* extraflags[1]
* os[1]
* compressed data blocks[N]
* crc[4] orig_len[4]
*
* resulting in 18 bytes of non compressed data overhead.
*
* Files divided into blocks
* 1 bit (last block flag)
* 2 bits (block type)
*
* 1 block occurs every 32K -1 bytes or when there 50% compression
* has been achieved. The smallest block type encoding is always used.
*
* stored:
* 32 bits length in bytes.
*
* fixed:
* magic fixed tree.
* symbols.
*
* dynamic:
* dynamic tree encoding.
* symbols.
*
*
* The buffer for decompression in place is the length of the
* uncompressed data, plus a small amount extra to keep the algorithm safe.
* The compressed data is placed at the end of the buffer. The output
* pointer is placed at the start of the buffer and the input pointer
* is placed where the compressed data starts. Problems will occur
* when the output pointer overruns the input pointer.
*
* The output pointer can only overrun the input pointer if the input
* pointer is moving faster than the output pointer. A condition only
* triggered by data whose compressed form is larger than the uncompressed
* form.
*
* The worst case at the block level is a growth of the compressed data
* of 5 bytes per 32767 bytes.
*
* The worst case internal to a compressed block is very hard to figure.
* The worst case can at least be boundined by having one bit that represents
* 32764 bytes and then all of the rest of the bytes representing the very
* very last byte.
*
* All of which is enough to compute an amount of extra data that is required
* to be safe. To avoid problems at the block level allocating 5 extra bytes
* per 32767 bytes of data is sufficient. To avoind problems internal to a
* block adding an extra 32767 bytes (the worst case uncompressed block size)
* is sufficient, to ensure that in the worst case the decompressed data for
* block will stop the byte before the compressed data for a block begins.
* To avoid problems with the compressed data's meta information an extra 18
* bytes are needed. Leading to the formula:
*
* extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
*
* Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
* Adding 32768 instead of 32767 just makes for round numbers.
* Adding the decompressor_size is necessary as it musht live after all
* of the data as well. Last I measured the decompressor is about 14K.
* 10K of actual data and 4K of bss.
*
* WARNING!!
* This code is compiled with -fPIC and it is relocated dynamically at
* run time, but no relocation processing is performed. This means that
* it is not safe to place pointers in static structures.
*/
/*
* gzip declarations
*/
/* Macros used by the included decompressor code below. */
#define STATIC static
#undef memcpy
/*
* Use a normal definition of memset() from string.c. There are already
* Use normal definitions of mem*() from string.c. There are already
* included header files which expect a definition of memset() and by
* the time we define memset macro, it is too late.
*/
#undef memcpy
#undef memset
#define memzero(s, n) memset((s), 0, (n))
#define memmove memmove
static void error(char *m);
/* Functions used by the included decompressor code below. */
void *memmove(void *dest, const void *src, size_t n);
/*
* This is set up by the setup-routine at boot-time
*/
struct boot_params *real_mode; /* Pointer to real-mode data */
struct boot_params *boot_params;
memptr free_mem_ptr;
memptr free_mem_end_ptr;
@ -146,12 +74,16 @@ static int lines, cols;
#ifdef CONFIG_KERNEL_LZ4
#include "../../../../lib/decompress_unlz4.c"
#endif
/*
* NOTE: When adding a new decompressor, please update the analysis in
* ../header.S.
*/
static void scroll(void)
{
int i;
memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
memmove(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
vidmem[i] = ' ';
}
@ -184,12 +116,12 @@ void __putstr(const char *s)
}
}
if (real_mode->screen_info.orig_video_mode == 0 &&
if (boot_params->screen_info.orig_video_mode == 0 &&
lines == 0 && cols == 0)
return;
x = real_mode->screen_info.orig_x;
y = real_mode->screen_info.orig_y;
x = boot_params->screen_info.orig_x;
y = boot_params->screen_info.orig_y;
while ((c = *s++) != '\0') {
if (c == '\n') {
@ -210,8 +142,8 @@ void __putstr(const char *s)
}
}
real_mode->screen_info.orig_x = x;
real_mode->screen_info.orig_y = y;
boot_params->screen_info.orig_x = x;
boot_params->screen_info.orig_y = y;
pos = (x + cols * y) * 2; /* Update cursor position */
outb(14, vidport);
@ -237,23 +169,13 @@ void __puthex(unsigned long value)
}
}
static void error(char *x)
{
error_putstr("\n\n");
error_putstr(x);
error_putstr("\n\n -- System halted");
while (1)
asm("hlt");
}
#if CONFIG_X86_NEED_RELOCS
static void handle_relocations(void *output, unsigned long output_len)
{
int *reloc;
unsigned long delta, map, ptr;
unsigned long min_addr = (unsigned long)output;
unsigned long max_addr = min_addr + output_len;
unsigned long max_addr = min_addr + (VO___bss_start - VO__text);
/*
* Calculate the delta between where vmlinux was linked to load
@ -295,7 +217,7 @@ static void handle_relocations(void *output, unsigned long output_len)
* So we work backwards from the end of the decompressed image.
*/
for (reloc = output + output_len - sizeof(*reloc); *reloc; reloc--) {
int extended = *reloc;
long extended = *reloc;
extended += map;
ptr = (unsigned long)extended;
@ -372,9 +294,7 @@ static void parse_elf(void *output)
#else
dest = (void *)(phdr->p_paddr);
#endif
memcpy(dest,
output + phdr->p_offset,
phdr->p_filesz);
memmove(dest, output + phdr->p_offset, phdr->p_filesz);
break;
default: /* Ignore other PT_* */ break;
}
@ -383,23 +303,41 @@ static void parse_elf(void *output)
free(phdrs);
}
asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
/*
* The compressed kernel image (ZO), has been moved so that its position
* is against the end of the buffer used to hold the uncompressed kernel
* image (VO) and the execution environment (.bss, .brk), which makes sure
* there is room to do the in-place decompression. (See header.S for the
* calculations.)
*
* |-----compressed kernel image------|
* V V
* 0 extract_offset +INIT_SIZE
* |-----------|---------------|-------------------------|--------|
* | | | |
* VO__text startup_32 of ZO VO__end ZO__end
* ^ ^
* |-------uncompressed kernel image---------|
*
*/
asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
unsigned char *input_data,
unsigned long input_len,
unsigned char *output,
unsigned long output_len,
unsigned long run_size)
unsigned long output_len)
{
const unsigned long kernel_total_size = VO__end - VO__text;
unsigned char *output_orig = output;
real_mode = rmode;
/* Retain x86 boot parameters pointer passed from startup_32/64. */
boot_params = rmode;
/* Clear it for solely in-kernel use */
real_mode->hdr.loadflags &= ~KASLR_FLAG;
/* Clear flags intended for solely in-kernel use. */
boot_params->hdr.loadflags &= ~KASLR_FLAG;
sanitize_boot_params(real_mode);
sanitize_boot_params(boot_params);
if (real_mode->screen_info.orig_video_mode == 7) {
if (boot_params->screen_info.orig_video_mode == 7) {
vidmem = (char *) 0xb0000;
vidport = 0x3b4;
} else {
@ -407,11 +345,11 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
vidport = 0x3d4;
}
lines = real_mode->screen_info.orig_video_lines;
cols = real_mode->screen_info.orig_video_cols;
lines = boot_params->screen_info.orig_video_lines;
cols = boot_params->screen_info.orig_video_cols;
console_init();
debug_putstr("early console in decompress_kernel\n");
debug_putstr("early console in extract_kernel\n");
free_mem_ptr = heap; /* Heap */
free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
@ -421,16 +359,16 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
debug_putaddr(input_len);
debug_putaddr(output);
debug_putaddr(output_len);
debug_putaddr(run_size);
debug_putaddr(kernel_total_size);
/*
* The memory hole needed for the kernel is the larger of either
* the entire decompressed kernel plus relocation table, or the
* entire decompressed kernel plus .bss and .brk sections.
*/
output = choose_kernel_location(real_mode, input_data, input_len, output,
output_len > run_size ? output_len
: run_size);
output = choose_random_location((unsigned long)input_data, input_len,
(unsigned long)output,
max(output_len, kernel_total_size));
/* Validate memory location choices. */
if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))

27
arch/x86/boot/compressed/misc.h
View File

@ -32,7 +32,7 @@
/* misc.c */
extern memptr free_mem_ptr;
extern memptr free_mem_end_ptr;
extern struct boot_params *real_mode; /* Pointer to real-mode data */
extern struct boot_params *boot_params;
void __putstr(const char *s);
void __puthex(unsigned long value);
#define error_putstr(__x) __putstr(__x)
@ -66,26 +66,35 @@ int cmdline_find_option_bool(const char *option);
#if CONFIG_RANDOMIZE_BASE
/* aslr.c */
unsigned char *choose_kernel_location(struct boot_params *boot_params,
unsigned char *input,
/* kaslr.c */
unsigned char *choose_random_location(unsigned long input_ptr,
unsigned long input_size,
unsigned char *output,
unsigned long output_ptr,
unsigned long output_size);
/* cpuflags.c */
bool has_cpuflag(int flag);
#else
static inline
unsigned char *choose_kernel_location(struct boot_params *boot_params,
unsigned char *input,
unsigned char *choose_random_location(unsigned long input_ptr,
unsigned long input_size,
unsigned char *output,
unsigned long output_ptr,
unsigned long output_size)
{
return output;
return (unsigned char *)output_ptr;
}
#endif
#ifdef CONFIG_X86_64
void add_identity_map(unsigned long start, unsigned long size);
void finalize_identity_maps(void);
extern unsigned char _pgtable[];
#else
static inline void add_identity_map(unsigned long start, unsigned long size)
{ }
static inline void finalize_identity_maps(void)
{ }
#endif
#ifdef CONFIG_EARLY_PRINTK
/* early_serial_console.c */
extern int early_serial_base;

34
arch/x86/boot/compressed/mkpiggy.c
View File

@ -18,11 +18,10 @@
*
* H. Peter Anvin <hpa@linux.intel.com>
*
* ----------------------------------------------------------------------- */
/*
* Compute the desired load offset from a compressed program; outputs
* a small assembly wrapper with the appropriate symbols defined.
* -----------------------------------------------------------------------
*
* Outputs a small assembly wrapper with the appropriate symbols defined.
*
*/
#include <stdlib.h>
@ -35,14 +34,11 @@ int main(int argc, char *argv[])
{
uint32_t olen;
long ilen;
unsigned long offs;
unsigned long run_size;
FILE *f = NULL;
int retval = 1;
if (argc < 3) {
fprintf(stderr, "Usage: %s compressed_file run_size\n",
argv[0]);
if (argc < 2) {
fprintf(stderr, "Usage: %s compressed_file\n", argv[0]);
goto bail;
}
@ -67,29 +63,11 @@ int main(int argc, char *argv[])
ilen = ftell(f);
olen = get_unaligned_le32(&olen);
/*
* Now we have the input (compressed) and output (uncompressed)
* sizes, compute the necessary decompression offset...
*/
offs = (olen > ilen) ? olen - ilen : 0;
offs += olen >> 12; /* Add 8 bytes for each 32K block */
offs += 64*1024 + 128; /* Add 64K + 128 bytes slack */
offs = (offs+4095) & ~4095; /* Round to a 4K boundary */
run_size = atoi(argv[2]);
printf(".section \".rodata..compressed\",\"a\",@progbits\n");
printf(".globl z_input_len\n");
printf("z_input_len = %lu\n", ilen);
printf(".globl z_output_len\n");
printf("z_output_len = %lu\n", (unsigned long)olen);
printf(".globl z_extract_offset\n");
printf("z_extract_offset = 0x%lx\n", offs);
/* z_extract_offset_negative allows simplification of head_32.S */
printf(".globl z_extract_offset_negative\n");
printf("z_extract_offset_negative = -0x%lx\n", offs);
printf(".globl z_run_size\n");
printf("z_run_size = %lu\n", run_size);
printf(".globl input_data, input_data_end\n");
printf("input_data:\n");

129
arch/x86/boot/compressed/pagetable.c Normal file
View File

@ -0,0 +1,129 @@
/*
* This code is used on x86_64 to create page table identity mappings on
* demand by building up a new set of page tables (or appending to the
* existing ones), and then switching over to them when ready.
*/
/*
* Since we're dealing with identity mappings, physical and virtual
* addresses are the same, so override these defines which are ultimately
* used by the headers in misc.h.
*/
#define __pa(x) ((unsigned long)(x))
#define __va(x) ((void *)((unsigned long)(x)))
#include "misc.h"
/* These actually do the work of building the kernel identity maps. */
#include <asm/init.h>
#include <asm/pgtable.h>
#include "../../mm/ident_map.c"
/* Used by pgtable.h asm code to force instruction serialization. */
unsigned long __force_order;
/* Used to track our page table allocation area. */
struct alloc_pgt_data {
unsigned char *pgt_buf;
unsigned long pgt_buf_size;
unsigned long pgt_buf_offset;
};
/*
* Allocates space for a page table entry, using struct alloc_pgt_data
* above. Besides the local callers, this is used as the allocation
* callback in mapping_info below.
*/
static void *alloc_pgt_page(void *context)
{
struct alloc_pgt_data *pages = (struct alloc_pgt_data *)context;
unsigned char *entry;
/* Validate there is space available for a new page. */
if (pages->pgt_buf_offset >= pages->pgt_buf_size) {
debug_putstr("out of pgt_buf in " __FILE__ "!?\n");
debug_putaddr(pages->pgt_buf_offset);
debug_putaddr(pages->pgt_buf_size);
return NULL;
}
entry = pages->pgt_buf + pages->pgt_buf_offset;
pages->pgt_buf_offset += PAGE_SIZE;
return entry;
}
/* Used to track our allocated page tables. */
static struct alloc_pgt_data pgt_data;
/* The top level page table entry pointer. */
static unsigned long level4p;
/* Locates and clears a region for a new top level page table. */
static void prepare_level4(void)
{
/*
* It should be impossible for this not to already be true,
* but since calling this a second time would rewind the other
* counters, let's just make sure this is reset too.
*/
pgt_data.pgt_buf_offset = 0;
/*
* If we came here via startup_32(), cr3 will be _pgtable already
* and we must append to the existing area instead of entirely
* overwriting it.
*/
level4p = read_cr3();
if (level4p == (unsigned long)_pgtable) {
debug_putstr("booted via startup_32()\n");
pgt_data.pgt_buf = _pgtable + BOOT_INIT_PGT_SIZE;
pgt_data.pgt_buf_size = BOOT_PGT_SIZE - BOOT_INIT_PGT_SIZE;
memset(pgt_data.pgt_buf, 0, pgt_data.pgt_buf_size);
} else {
debug_putstr("booted via startup_64()\n");
pgt_data.pgt_buf = _pgtable;
pgt_data.pgt_buf_size = BOOT_PGT_SIZE;
memset(pgt_data.pgt_buf, 0, pgt_data.pgt_buf_size);
level4p = (unsigned long)alloc_pgt_page(&pgt_data);
}
}
/*
* Adds the specified range to what will become the new identity mappings.
* Once all ranges have been added, the new mapping is activated by calling
* finalize_identity_maps() below.
*/
void add_identity_map(unsigned long start, unsigned long size)
{
struct x86_mapping_info mapping_info = {
.alloc_pgt_page = alloc_pgt_page,
.context = &pgt_data,
.pmd_flag = __PAGE_KERNEL_LARGE_EXEC,
};
unsigned long end = start + size;
/* Make sure we have a top level page table ready to use. */
if (!level4p)
prepare_level4();
/* Align boundary to 2M. */
start = round_down(start, PMD_SIZE);
end = round_up(end, PMD_SIZE);
if (start >= end)
return;
/* Build the mapping. */
kernel_ident_mapping_init(&mapping_info, (pgd_t *)level4p,
start, end);
}
/*
* This switches the page tables to the new level4 that has been built
* via calls to add_identity_map() above. If booted via startup_32(),
* this is effectively a no-op.
*/
void finalize_identity_maps(void)
{
write_cr3(level4p);
}

37
arch/x86/boot/compressed/string.c
View File

@ -1,7 +1,16 @@
/*
* This provides an optimized implementation of memcpy, and a simplified
* implementation of memset and memmove. These are used here because the
* standard kernel runtime versions are not yet available and we don't
* trust the gcc built-in implementations as they may do unexpected things
* (e.g. FPU ops) in the minimal decompression stub execution environment.
*/
#include "error.h"
#include "../string.c"
#ifdef CONFIG_X86_32
void *memcpy(void *dest, const void *src, size_t n)
static void *__memcpy(void *dest, const void *src, size_t n)
{
int d0, d1, d2;
asm volatile(
@ -15,7 +24,7 @@ void *memcpy(void *dest, const void *src, size_t n)
return dest;
}
#else
void *memcpy(void *dest, const void *src, size_t n)
static void *__memcpy(void *dest, const void *src, size_t n)
{
long d0, d1, d2;
asm volatile(
@ -39,3 +48,27 @@ void *memset(void *s, int c, size_t n)
ss[i] = c;
return s;
}
void *memmove(void *dest, const void *src, size_t n)
{
unsigned char *d = dest;
const unsigned char *s = src;
if (d <= s || d - s >= n)
return __memcpy(dest, src, n);
while (n-- > 0)
d[n] = s[n];
return dest;
}
/* Detect and warn about potential overlaps, but handle them with memmove. */
void *memcpy(void *dest, const void *src, size_t n)
{
if (dest > src && dest - src < n) {
warn("Avoiding potentially unsafe overlapping memcpy()!");
return memmove(dest, src, n);
}
return __memcpy(dest, src, n);
}

1
arch/x86/boot/compressed/vmlinux.lds.S
View File

@ -70,5 +70,6 @@ SECTIONS
_epgtable = . ;
}
#endif
. = ALIGN(PAGE_SIZE); /* keep ZO size page aligned */
_end = .;
}

4
arch/x86/boot/early_serial_console.c
View File

@ -1,3 +1,7 @@
/*
* Serial port routines for use during early boot reporting. This code is
* included from both the compressed kernel and the regular kernel.
*/
#include "boot.h"
#define DEFAULT_SERIAL_PORT 0x3f8 /* ttyS0 */

109
arch/x86/boot/header.S
View File

@ -440,13 +440,116 @@ setup_data: .quad 0 # 64-bit physical pointer to
pref_address: .quad LOAD_PHYSICAL_ADDR # preferred load addr
#define ZO_INIT_SIZE (ZO__end - ZO_startup_32 + ZO_z_extract_offset)
#
# Getting to provably safe in-place decompression is hard. Worst case
# behaviours need to be analyzed. Here let's take the decompression of
# a gzip-compressed kernel as example, to illustrate it:
#
# The file layout of gzip compressed kernel is:
#
# magic[2]
# method[1]
# flags[1]
# timestamp[4]
# extraflags[1]
# os[1]
# compressed data blocks[N]
# crc[4] orig_len[4]
#
# ... resulting in +18 bytes overhead of uncompressed data.
#
# (For more information, please refer to RFC 1951 and RFC 1952.)
#
# Files divided into blocks
# 1 bit (last block flag)
# 2 bits (block type)
#
# 1 block occurs every 32K -1 bytes or when there 50% compression
# has been achieved. The smallest block type encoding is always used.
#
# stored:
# 32 bits length in bytes.
#
# fixed:
# magic fixed tree.
# symbols.
#
# dynamic:
# dynamic tree encoding.
# symbols.
#
#
# The buffer for decompression in place is the length of the uncompressed
# data, plus a small amount extra to keep the algorithm safe. The
# compressed data is placed at the end of the buffer. The output pointer
# is placed at the start of the buffer and the input pointer is placed
# where the compressed data starts. Problems will occur when the output
# pointer overruns the input pointer.
#
# The output pointer can only overrun the input pointer if the input
# pointer is moving faster than the output pointer. A condition only
# triggered by data whose compressed form is larger than the uncompressed
# form.
#
# The worst case at the block level is a growth of the compressed data
# of 5 bytes per 32767 bytes.
#
# The worst case internal to a compressed block is very hard to figure.
# The worst case can at least be bounded by having one bit that represents
# 32764 bytes and then all of the rest of the bytes representing the very
# very last byte.
#
# All of which is enough to compute an amount of extra data that is required
# to be safe. To avoid problems at the block level allocating 5 extra bytes
# per 32767 bytes of data is sufficient. To avoid problems internal to a
# block adding an extra 32767 bytes (the worst case uncompressed block size)
# is sufficient, to ensure that in the worst case the decompressed data for
# block will stop the byte before the compressed data for a block begins.
# To avoid problems with the compressed data's meta information an extra 18
# bytes are needed. Leading to the formula:
#
# extra_bytes = (uncompressed_size >> 12) + 32768 + 18
#
# Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
# Adding 32768 instead of 32767 just makes for round numbers.
#
# Above analysis is for decompressing gzip compressed kernel only. Up to
# now 6 different decompressor are supported all together. And among them
# xz stores data in chunks and has maximum chunk of 64K. Hence safety
# margin should be updated to cover all decompressors so that we don't
# need to deal with each of them separately. Please check
# the description in lib/decompressor_xxx.c for specific information.
#
# extra_bytes = (uncompressed_size >> 12) + 65536 + 128
#define ZO_z_extra_bytes ((ZO_z_output_len >> 12) + 65536 + 128)
#if ZO_z_output_len > ZO_z_input_len
# define ZO_z_extract_offset (ZO_z_output_len + ZO_z_extra_bytes - \
ZO_z_input_len)
#else
# define ZO_z_extract_offset ZO_z_extra_bytes
#endif
/*
* The extract_offset has to be bigger than ZO head section. Otherwise when
* the head code is running to move ZO to the end of the buffer, it will
* overwrite the head code itself.
*/
#if (ZO__ehead - ZO_startup_32) > ZO_z_extract_offset
# define ZO_z_min_extract_offset ((ZO__ehead - ZO_startup_32 + 4095) & ~4095)
#else
# define ZO_z_min_extract_offset ((ZO_z_extract_offset + 4095) & ~4095)
#endif
#define ZO_INIT_SIZE (ZO__end - ZO_startup_32 + ZO_z_min_extract_offset)
#define VO_INIT_SIZE (VO__end - VO__text)
#if ZO_INIT_SIZE > VO_INIT_SIZE
#define INIT_SIZE ZO_INIT_SIZE
# define INIT_SIZE ZO_INIT_SIZE
#else
#define INIT_SIZE VO_INIT_SIZE
# define INIT_SIZE VO_INIT_SIZE
#endif
init_size: .long INIT_SIZE # kernel initialization size
handover_offset: .long 0 # Filled in by build.c

1
arch/x86/configs/x86_64_defconfig
View File

@ -173,6 +173,7 @@ CONFIG_TIGON3=y
CONFIG_NET_TULIP=y
CONFIG_E100=y
CONFIG_E1000=y
CONFIG_E1000E=y
CONFIG_SKY2=y
CONFIG_FORCEDETH=y
CONFIG_8139TOO=y

2
arch/x86/crypto/aesni-intel_glue.c
View File

@ -1477,7 +1477,7 @@ static int __init aesni_init(void)
}
aesni_ctr_enc_tfm = aesni_ctr_enc;
#ifdef CONFIG_AS_AVX
if (cpu_has_avx) {
if (boot_cpu_has(X86_FEATURE_AVX)) {
/* optimize performance of ctr mode encryption transform */
aesni_ctr_enc_tfm = aesni_ctr_enc_avx_tfm;
pr_info("AES CTR mode by8 optimization enabled\n");

5
arch/x86/crypto/camellia_aesni_avx2_glue.c
View File

@ -562,7 +562,10 @@ static int __init camellia_aesni_init(void)
{
const char *feature_name;
if (!cpu_has_avx2 || !cpu_has_avx || !cpu_has_aes || !cpu_has_osxsave) {
if (!boot_cpu_has(X86_FEATURE_AVX) ||
!boot_cpu_has(X86_FEATURE_AVX2) ||
!boot_cpu_has(X86_FEATURE_AES) ||
!boot_cpu_has(X86_FEATURE_OSXSAVE)) {
pr_info("AVX2 or AES-NI instructions are not detected.\n");
return -ENODEV;
}

4
arch/x86/crypto/camellia_aesni_avx_glue.c
View File

@ -554,7 +554,9 @@ static int __init camellia_aesni_init(void)
{
const char *feature_name;
if (!cpu_has_avx || !cpu_has_aes || !cpu_has_osxsave) {
if (!boot_cpu_has(X86_FEATURE_AVX) ||
!boot_cpu_has(X86_FEATURE_AES) ||
!boot_cpu_has(X86_FEATURE_OSXSAVE)) {
pr_info("AVX or AES-NI instructions are not detected.\n");
return -ENODEV;
}

3
arch/x86/crypto/chacha20_glue.c
View File

@ -129,7 +129,8 @@ static int __init chacha20_simd_mod_init(void)
return -ENODEV;
#ifdef CONFIG_AS_AVX2
chacha20_use_avx2 = cpu_has_avx && cpu_has_avx2 &&
chacha20_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
boot_cpu_has(X86_FEATURE_AVX2) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
#endif
return crypto_register_alg(&alg);

5
arch/x86/crypto/poly1305_glue.c
View File

@ -179,11 +179,12 @@ static struct shash_alg alg = {
static int __init poly1305_simd_mod_init(void)
{
if (!cpu_has_xmm2)
if (!boot_cpu_has(X86_FEATURE_XMM2))
return -ENODEV;
#ifdef CONFIG_AS_AVX2
poly1305_use_avx2 = cpu_has_avx && cpu_has_avx2 &&
poly1305_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
boot_cpu_has(X86_FEATURE_AVX2) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
alg.descsize = sizeof(struct poly1305_simd_desc_ctx);
if (poly1305_use_avx2)

2
arch/x86/crypto/serpent_avx2_glue.c
View File

@ -538,7 +538,7 @@ static int __init init(void)
{
const char *feature_name;
if (!cpu_has_avx2 || !cpu_has_osxsave) {
if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
pr_info("AVX2 instructions are not detected.\n");
return -ENODEV;
}

2
arch/x86/crypto/serpent_sse2_glue.c
View File

@ -600,7 +600,7 @@ static struct crypto_alg serpent_algs[10] = { {
static int __init serpent_sse2_init(void)
{
if (!cpu_has_xmm2) {
if (!boot_cpu_has(X86_FEATURE_XMM2)) {
printk(KERN_INFO "SSE2 instructions are not detected.\n");
return -ENODEV;
}

4
arch/x86/crypto/sha-mb/sha1_mb.c
View File

@ -102,14 +102,14 @@ static asmlinkage struct job_sha1* (*sha1_job_mgr_submit)(struct sha1_mb_mgr *st
static asmlinkage struct job_sha1* (*sha1_job_mgr_flush)(struct sha1_mb_mgr *state);
static asmlinkage struct job_sha1* (*sha1_job_mgr_get_comp_job)(struct sha1_mb_mgr *state);
inline void sha1_init_digest(uint32_t *digest)
static inline void sha1_init_digest(uint32_t *digest)
{
static const uint32_t initial_digest[SHA1_DIGEST_LENGTH] = {SHA1_H0,
SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 };
memcpy(digest, initial_digest, sizeof(initial_digest));
}
inline uint32_t sha1_pad(uint8_t padblock[SHA1_BLOCK_SIZE * 2],
static inline uint32_t sha1_pad(uint8_t padblock[SHA1_BLOCK_SIZE * 2],
uint32_t total_len)
{
uint32_t i = total_len & (SHA1_BLOCK_SIZE - 1);

2
arch/x86/crypto/sha1_ssse3_glue.c
View File

@ -166,7 +166,7 @@ static struct shash_alg sha1_avx_alg = {
static bool avx_usable(void)
{
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
if (cpu_has_avx)
if (boot_cpu_has(X86_FEATURE_AVX))
pr_info("AVX detected but unusable.\n");
return false;
}

2
arch/x86/crypto/sha256_ssse3_glue.c
View File

@ -201,7 +201,7 @@ static struct shash_alg sha256_avx_algs[] = { {
static bool avx_usable(void)
{
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
if (cpu_has_avx)
if (boot_cpu_has(X86_FEATURE_AVX))
pr_info("AVX detected but unusable.\n");
return false;
}

2
arch/x86/crypto/sha512_ssse3_glue.c
View File

@ -151,7 +151,7 @@ asmlinkage void sha512_transform_avx(u64 *digest, const char *data,
static bool avx_usable(void)
{
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
if (cpu_has_avx)
if (boot_cpu_has(X86_FEATURE_AVX))
pr_info("AVX detected but unusable.\n");
return false;
}

2
arch/x86/entry/common.c
View File

@ -191,7 +191,7 @@ long syscall_trace_enter_phase2(struct pt_regs *regs, u32 arch,
long syscall_trace_enter(struct pt_regs *regs)
{
u32 arch = is_ia32_task() ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
u32 arch = in_ia32_syscall() ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
unsigned long phase1_result = syscall_trace_enter_phase1(regs, arch);
if (phase1_result == 0)

7
arch/x86/entry/entry_32.S
View File

@ -207,10 +207,7 @@
ENTRY(ret_from_fork)
pushl %eax
call schedule_tail
GET_THREAD_INFO(%ebp)
popl %eax
pushl $0x0202 # Reset kernel eflags
popfl
/* When we fork, we trace the syscall return in the child, too. */
movl %esp, %eax
@ -221,10 +218,7 @@ END(ret_from_fork)
ENTRY(ret_from_kernel_thread)
pushl %eax
call schedule_tail
GET_THREAD_INFO(%ebp)
popl %eax
pushl $0x0202 # Reset kernel eflags
popfl
movl PT_EBP(%esp), %eax
call *PT_EBX(%esp)
movl $0, PT_EAX(%esp)
@ -251,7 +245,6 @@ ENDPROC(ret_from_kernel_thread)
ret_from_exception:
preempt_stop(CLBR_ANY)
ret_from_intr:
GET_THREAD_INFO(%ebp)
#ifdef CONFIG_VM86
movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS
movb PT_CS(%esp), %al

21
arch/x86/entry/entry_64.S
View File

@ -372,9 +372,6 @@ END(ptregs_\func)
ENTRY(ret_from_fork)
LOCK ; btr $TIF_FORK, TI_flags(%r8)
pushq $0x0002
popfq /* reset kernel eflags */
call schedule_tail /* rdi: 'prev' task parameter */
testb $3, CS(%rsp) /* from kernel_thread? */
@ -781,19 +778,25 @@ ENTRY(native_load_gs_index)
pushfq
DISABLE_INTERRUPTS(CLBR_ANY & ~CLBR_RDI)
SWAPGS
gs_change:
.Lgs_change:
movl %edi, %gs
2: mfence /* workaround */
2: ALTERNATIVE "", "mfence", X86_BUG_SWAPGS_FENCE
SWAPGS
popfq
ret
END(native_load_gs_index)
_ASM_EXTABLE(gs_change, bad_gs)
_ASM_EXTABLE(.Lgs_change, bad_gs)
.section .fixup, "ax"
/* running with kernelgs */
bad_gs:
SWAPGS /* switch back to user gs */
.macro ZAP_GS
/* This can't be a string because the preprocessor needs to see it. */
movl $__USER_DS, %eax
movl %eax, %gs
.endm
ALTERNATIVE "", "ZAP_GS", X86_BUG_NULL_SEG
xorl %eax, %eax
movl %eax, %gs
jmp 2b
@ -1019,13 +1022,13 @@ ENTRY(error_entry)
movl %ecx, %eax /* zero extend */
cmpq %rax, RIP+8(%rsp)
je .Lbstep_iret
cmpq $gs_change, RIP+8(%rsp)
cmpq $.Lgs_change, RIP+8(%rsp)
jne .Lerror_entry_done
/*
* hack: gs_change can fail with user gsbase. If this happens, fix up
* hack: .Lgs_change can fail with user gsbase. If this happens, fix up
* gsbase and proceed. We'll fix up the exception and land in
* gs_change's error handler with kernel gsbase.
* .Lgs_change's error handler with kernel gsbase.
*/
jmp .Lerror_entry_from_usermode_swapgs

45
arch/x86/entry/entry_64_compat.S
View File

@ -72,24 +72,23 @@ ENTRY(entry_SYSENTER_compat)
pushfq /* pt_regs->flags (except IF = 0) */
orl $X86_EFLAGS_IF, (%rsp) /* Fix saved flags */
pushq $__USER32_CS /* pt_regs->cs */
xorq %r8,%r8
pushq %r8 /* pt_regs->ip = 0 (placeholder) */
pushq $0 /* pt_regs->ip = 0 (placeholder) */
pushq %rax /* pt_regs->orig_ax */
pushq %rdi /* pt_regs->di */
pushq %rsi /* pt_regs->si */
pushq %rdx /* pt_regs->dx */
pushq %rcx /* pt_regs->cx */
pushq $-ENOSYS /* pt_regs->ax */
pushq %r8 /* pt_regs->r8 = 0 */
pushq %r8 /* pt_regs->r9 = 0 */
pushq %r8 /* pt_regs->r10 = 0 */
pushq %r8 /* pt_regs->r11 = 0 */
pushq $0 /* pt_regs->r8 = 0 */
pushq $0 /* pt_regs->r9 = 0 */
pushq $0 /* pt_regs->r10 = 0 */
pushq $0 /* pt_regs->r11 = 0 */
pushq %rbx /* pt_regs->rbx */
pushq %rbp /* pt_regs->rbp (will be overwritten) */
pushq %r8 /* pt_regs->r12 = 0 */
pushq %r8 /* pt_regs->r13 = 0 */
pushq %r8 /* pt_regs->r14 = 0 */
pushq %r8 /* pt_regs->r15 = 0 */
pushq $0 /* pt_regs->r12 = 0 */
pushq $0 /* pt_regs->r13 = 0 */
pushq $0 /* pt_regs->r14 = 0 */
pushq $0 /* pt_regs->r15 = 0 */
cld
/*
@ -205,17 +204,16 @@ ENTRY(entry_SYSCALL_compat)
pushq %rdx /* pt_regs->dx */
pushq %rbp /* pt_regs->cx (stashed in bp) */
pushq $-ENOSYS /* pt_regs->ax */
xorq %r8,%r8
pushq %r8 /* pt_regs->r8 = 0 */
pushq %r8 /* pt_regs->r9 = 0 */
pushq %r8 /* pt_regs->r10 = 0 */
pushq %r8 /* pt_regs->r11 = 0 */
pushq $0 /* pt_regs->r8 = 0 */
pushq $0 /* pt_regs->r9 = 0 */
pushq $0 /* pt_regs->r10 = 0 */
pushq $0 /* pt_regs->r11 = 0 */
pushq %rbx /* pt_regs->rbx */
pushq %rbp /* pt_regs->rbp (will be overwritten) */
pushq %r8 /* pt_regs->r12 = 0 */
pushq %r8 /* pt_regs->r13 = 0 */
pushq %r8 /* pt_regs->r14 = 0 */
pushq %r8 /* pt_regs->r15 = 0 */
pushq $0 /* pt_regs->r12 = 0 */
pushq $0 /* pt_regs->r13 = 0 */
pushq $0 /* pt_regs->r14 = 0 */
pushq $0 /* pt_regs->r15 = 0 */
/*
* User mode is traced as though IRQs are on, and SYSENTER
@ -316,11 +314,10 @@ ENTRY(entry_INT80_compat)
pushq %rdx /* pt_regs->dx */
pushq %rcx /* pt_regs->cx */
pushq $-ENOSYS /* pt_regs->ax */
xorq %r8,%r8
pushq %r8 /* pt_regs->r8 = 0 */
pushq %r8 /* pt_regs->r9 = 0 */
pushq %r8 /* pt_regs->r10 = 0 */
pushq %r8 /* pt_regs->r11 = 0 */
pushq $0 /* pt_regs->r8 = 0 */
pushq $0 /* pt_regs->r9 = 0 */
pushq $0 /* pt_regs->r10 = 0 */
pushq $0 /* pt_regs->r11 = 0 */
pushq %rbx /* pt_regs->rbx */
pushq %rbp /* pt_regs->rbp */
pushq %r12 /* pt_regs->r12 */

2
arch/x86/entry/syscalls/syscall_64.tbl
View File

@ -374,3 +374,5 @@
543 x32 io_setup compat_sys_io_setup
544 x32 io_submit compat_sys_io_submit
545 x32 execveat compat_sys_execveat/ptregs
534 x32 preadv2 compat_sys_preadv2
535 x32 pwritev2 compat_sys_pwritev2

15
arch/x86/entry/vdso/vclock_gettime.c
View File

@ -13,7 +13,6 @@
#include <uapi/linux/time.h>
#include <asm/vgtod.h>
#include <asm/hpet.h>
#include <asm/vvar.h>
#include <asm/unistd.h>
#include <asm/msr.h>
@ -28,16 +27,6 @@ extern int __vdso_clock_gettime(clockid_t clock, struct timespec *ts);
extern int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz);
extern time_t __vdso_time(time_t *t);
#ifdef CONFIG_HPET_TIMER
extern u8 hpet_page
__attribute__((visibility("hidden")));
static notrace cycle_t vread_hpet(void)
{
return *(const volatile u32 *)(&hpet_page + HPET_COUNTER);
}
#endif
#ifdef CONFIG_PARAVIRT_CLOCK
extern u8 pvclock_page
__attribute__((visibility("hidden")));
@ -195,10 +184,6 @@ notrace static inline u64 vgetsns(int *mode)
if (gtod->vclock_mode == VCLOCK_TSC)
cycles = vread_tsc();
#ifdef CONFIG_HPET_TIMER
else if (gtod->vclock_mode == VCLOCK_HPET)
cycles = vread_hpet();
#endif
#ifdef CONFIG_PARAVIRT_CLOCK
else if (gtod->vclock_mode == VCLOCK_PVCLOCK)
cycles = vread_pvclock(mode);

5
arch/x86/entry/vdso/vdso-layout.lds.S
View File

@ -25,7 +25,7 @@ SECTIONS
* segment.
*/
vvar_start = . - 3 * PAGE_SIZE;
vvar_start = . - 2 * PAGE_SIZE;
vvar_page = vvar_start;
/* Place all vvars at the offsets in asm/vvar.h. */
@ -35,8 +35,7 @@ SECTIONS
#undef __VVAR_KERNEL_LDS
#undef EMIT_VVAR
hpet_page = vvar_start + PAGE_SIZE;
pvclock_page = vvar_start + 2 * PAGE_SIZE;
pvclock_page = vvar_start + PAGE_SIZE;
. = SIZEOF_HEADERS;

11
arch/x86/entry/vdso/vma.c
View File

@ -18,7 +18,6 @@
#include <asm/vdso.h>
#include <asm/vvar.h>
#include <asm/page.h>
#include <asm/hpet.h>
#include <asm/desc.h>
#include <asm/cpufeature.h>
@ -129,16 +128,6 @@ static int vvar_fault(const struct vm_special_mapping *sm,
if (sym_offset == image->sym_vvar_page) {
ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address,
__pa_symbol(&__vvar_page) >> PAGE_SHIFT);
} else if (sym_offset == image->sym_hpet_page) {
#ifdef CONFIG_HPET_TIMER
if (hpet_address && vclock_was_used(VCLOCK_HPET)) {
ret = vm_insert_pfn_prot(
vma,
(unsigned long)vmf->virtual_address,
hpet_address >> PAGE_SHIFT,
pgprot_noncached(PAGE_READONLY));
}
#endif
} else if (sym_offset == image->sym_pvclock_page) {
struct pvclock_vsyscall_time_info *pvti =
pvclock_pvti_cpu0_va();

36
arch/x86/events/Kconfig Normal file
View File

@ -0,0 +1,36 @@
menu "Performance monitoring"
config PERF_EVENTS_INTEL_UNCORE
tristate "Intel uncore performance events"
depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
default y
---help---
Include support for Intel uncore performance events. These are
available on NehalemEX and more modern processors.
config PERF_EVENTS_INTEL_RAPL
tristate "Intel rapl performance events"
depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
default y
---help---
Include support for Intel rapl performance events for power
monitoring on modern processors.
config PERF_EVENTS_INTEL_CSTATE
tristate "Intel cstate performance events"
depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
default y
---help---
Include support for Intel cstate performance events for power
monitoring on modern processors.
config PERF_EVENTS_AMD_POWER
depends on PERF_EVENTS && CPU_SUP_AMD
tristate "AMD Processor Power Reporting Mechanism"
---help---
Provide power reporting mechanism support for AMD processors.
Currently, it leverages X86_FEATURE_ACC_POWER
(CPUID Fn8000_0007_EDX[12]) interface to calculate the
average power consumption on Family 15h processors.
endmenu

9
arch/x86/events/Makefile
View File

@ -6,9 +6,6 @@ obj-$(CONFIG_X86_LOCAL_APIC) += amd/ibs.o msr.o
ifdef CONFIG_AMD_IOMMU
obj-$(CONFIG_CPU_SUP_AMD) += amd/iommu.o
endif
obj-$(CONFIG_CPU_SUP_INTEL) += intel/core.o intel/bts.o intel/cqm.o
obj-$(CONFIG_CPU_SUP_INTEL) += intel/cstate.o intel/ds.o intel/knc.o
obj-$(CONFIG_CPU_SUP_INTEL) += intel/lbr.o intel/p4.o intel/p6.o intel/pt.o
obj-$(CONFIG_CPU_SUP_INTEL) += intel/rapl.o msr.o
obj-$(CONFIG_PERF_EVENTS_INTEL_UNCORE) += intel/uncore.o intel/uncore_nhmex.o
obj-$(CONFIG_PERF_EVENTS_INTEL_UNCORE) += intel/uncore_snb.o intel/uncore_snbep.o
obj-$(CONFIG_CPU_SUP_INTEL) += msr.o
obj-$(CONFIG_CPU_SUP_INTEL) += intel/

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