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916cda1aa1
This adds a new system call to enable the use of guarded storage for
user space processes. The system call takes two arguments, a command
and pointer to a guarded storage control block:
s390_guarded_storage(int command, struct gs_cb *gs_cb);
The second argument is relevant only for the GS_SET_BC_CB command.
The commands in detail:
0 - GS_ENABLE
Enable the guarded storage facility for the current task. The
initial content of the guarded storage control block will be
all zeros. After the enablement the user space code can use
load-guarded-storage-controls instruction (LGSC) to load an
arbitrary control block. While a task is enabled the kernel
will save and restore the current content of the guarded
storage registers on context switch.
1 - GS_DISABLE
Disables the use of the guarded storage facility for the current
task. The kernel will cease to save and restore the content of
the guarded storage registers, the task specific content of
these registers is lost.
2 - GS_SET_BC_CB
Set a broadcast guarded storage control block. This is called
per thread and stores a specific guarded storage control block
in the task struct of the current task. This control block will
be used for the broadcast event GS_BROADCAST.
3 - GS_CLEAR_BC_CB
Clears the broadcast guarded storage control block. The guarded-
storage control block is removed from the task struct that was
established by GS_SET_BC_CB.
4 - GS_BROADCAST
Sends a broadcast to all thread siblings of the current task.
Every sibling that has established a broadcast guarded storage
control block will load this control block and will be enabled
for guarded storage. The broadcast guarded storage control block
is used up, a second broadcast without a refresh of the stored
control block with GS_SET_BC_CB will not have any effect.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/*
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* Machine check handler definitions
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*
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* Copyright IBM Corp. 2000, 2009
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* Author(s): Ingo Adlung <adlung@de.ibm.com>,
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* Martin Schwidefsky <schwidefsky@de.ibm.com>,
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* Cornelia Huck <cornelia.huck@de.ibm.com>,
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* Heiko Carstens <heiko.carstens@de.ibm.com>,
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*/
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#ifndef _ASM_S390_NMI_H
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#define _ASM_S390_NMI_H
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#include <linux/const.h>
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#include <linux/types.h>
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#define MCCK_CODE_SYSTEM_DAMAGE _BITUL(63)
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#define MCCK_CODE_CPU_TIMER_VALID _BITUL(63 - 46)
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#define MCCK_CODE_PSW_MWP_VALID _BITUL(63 - 20)
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#define MCCK_CODE_PSW_IA_VALID _BITUL(63 - 23)
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#ifndef __ASSEMBLY__
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union mci {
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unsigned long val;
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struct {
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u64 sd : 1; /* 00 system damage */
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u64 pd : 1; /* 01 instruction-processing damage */
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u64 sr : 1; /* 02 system recovery */
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u64 : 1; /* 03 */
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u64 cd : 1; /* 04 timing-facility damage */
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u64 ed : 1; /* 05 external damage */
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u64 : 1; /* 06 */
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u64 dg : 1; /* 07 degradation */
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u64 w : 1; /* 08 warning pending */
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u64 cp : 1; /* 09 channel-report pending */
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u64 sp : 1; /* 10 service-processor damage */
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u64 ck : 1; /* 11 channel-subsystem damage */
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u64 : 2; /* 12-13 */
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u64 b : 1; /* 14 backed up */
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u64 : 1; /* 15 */
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u64 se : 1; /* 16 storage error uncorrected */
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u64 sc : 1; /* 17 storage error corrected */
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u64 ke : 1; /* 18 storage-key error uncorrected */
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u64 ds : 1; /* 19 storage degradation */
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u64 wp : 1; /* 20 psw mwp validity */
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u64 ms : 1; /* 21 psw mask and key validity */
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u64 pm : 1; /* 22 psw program mask and cc validity */
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u64 ia : 1; /* 23 psw instruction address validity */
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u64 fa : 1; /* 24 failing storage address validity */
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u64 vr : 1; /* 25 vector register validity */
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u64 ec : 1; /* 26 external damage code validity */
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u64 fp : 1; /* 27 floating point register validity */
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u64 gr : 1; /* 28 general register validity */
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u64 cr : 1; /* 29 control register validity */
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u64 : 1; /* 30 */
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u64 st : 1; /* 31 storage logical validity */
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u64 ie : 1; /* 32 indirect storage error */
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u64 ar : 1; /* 33 access register validity */
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u64 da : 1; /* 34 delayed access exception */
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u64 : 1; /* 35 */
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u64 gs : 1; /* 36 guarded storage registers */
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u64 : 5; /* 37-41 */
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u64 pr : 1; /* 42 tod programmable register validity */
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u64 fc : 1; /* 43 fp control register validity */
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u64 ap : 1; /* 44 ancillary report */
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u64 : 1; /* 45 */
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u64 ct : 1; /* 46 cpu timer validity */
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u64 cc : 1; /* 47 clock comparator validity */
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u64 : 16; /* 47-63 */
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};
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};
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#define MCESA_ORIGIN_MASK (~0x3ffUL)
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#define MCESA_LC_MASK (0xfUL)
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struct mcesa {
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u8 vector_save_area[1024];
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u8 guarded_storage_save_area[32];
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};
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struct pt_regs;
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extern void s390_handle_mcck(void);
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extern void s390_do_machine_check(struct pt_regs *regs);
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_S390_NMI_H */
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