mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 03:48:11 +07:00
96f1050d3d
Bill Gatliff & David Brownell pointed out we were missing some copyrights, and licensing terms in some of the files in ./arch/blackfin, so this fixes things, and cleans them up. It also removes: - verbose GPL text(refer to the top level ./COPYING file) - file names (you are looking at the file) - bug url (it's in the ./MAINTAINERS file) - "or later" on GPL-2, when we did not have that right It also allows some Blackfin-specific assembly files to be under a BSD like license (for people to use them outside of Linux). Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
156 lines
3.3 KiB
ArmAsm
156 lines
3.3 KiB
ArmAsm
/*
|
|
* This file contains sequences of code that will be copied to a
|
|
* fixed location, defined in <asm/fixed_code.h>. The interrupt
|
|
* handlers ensure that these sequences appear to be atomic when
|
|
* executed from userspace.
|
|
* These are aligned to 16 bytes, so that we have some space to replace
|
|
* these sequences with something else (e.g. kernel traps if we ever do
|
|
* BF561 SMP).
|
|
*
|
|
* Copyright 2007-2008 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
#include <linux/unistd.h>
|
|
#include <asm/entry.h>
|
|
|
|
__INIT
|
|
|
|
ENTRY(_fixed_code_start)
|
|
|
|
.align 16
|
|
ENTRY(_sigreturn_stub)
|
|
P0 = __NR_rt_sigreturn;
|
|
EXCPT 0;
|
|
/* Speculative execution paranoia. */
|
|
0: JUMP.S 0b;
|
|
ENDPROC (_sigreturn_stub)
|
|
|
|
.align 16
|
|
/*
|
|
* Atomic swap, 8 bit.
|
|
* Inputs: P0: memory address to use
|
|
* R1: value to store
|
|
* Output: R0: old contents of the memory address, zero extended.
|
|
*/
|
|
ENTRY(_atomic_xchg32)
|
|
R0 = [P0];
|
|
[P0] = R1;
|
|
rts;
|
|
ENDPROC (_atomic_xchg32)
|
|
|
|
.align 16
|
|
/*
|
|
* Compare and swap, 32 bit.
|
|
* Inputs: P0: memory address to use
|
|
* R1: compare value
|
|
* R2: new value to store
|
|
* The new value is stored if the contents of the memory
|
|
* address is equal to the compare value.
|
|
* Output: R0: old contents of the memory address.
|
|
*/
|
|
ENTRY(_atomic_cas32)
|
|
R0 = [P0];
|
|
CC = R0 == R1;
|
|
IF !CC JUMP 1f;
|
|
[P0] = R2;
|
|
1:
|
|
rts;
|
|
ENDPROC (_atomic_cas32)
|
|
|
|
.align 16
|
|
/*
|
|
* Atomic add, 32 bit.
|
|
* Inputs: P0: memory address to use
|
|
* R0: value to add
|
|
* Outputs: R0: new contents of the memory address.
|
|
* R1: previous contents of the memory address.
|
|
*/
|
|
ENTRY(_atomic_add32)
|
|
R1 = [P0];
|
|
R0 = R1 + R0;
|
|
[P0] = R0;
|
|
rts;
|
|
ENDPROC (_atomic_add32)
|
|
|
|
.align 16
|
|
/*
|
|
* Atomic sub, 32 bit.
|
|
* Inputs: P0: memory address to use
|
|
* R0: value to subtract
|
|
* Outputs: R0: new contents of the memory address.
|
|
* R1: previous contents of the memory address.
|
|
*/
|
|
ENTRY(_atomic_sub32)
|
|
R1 = [P0];
|
|
R0 = R1 - R0;
|
|
[P0] = R0;
|
|
rts;
|
|
ENDPROC (_atomic_sub32)
|
|
|
|
.align 16
|
|
/*
|
|
* Atomic ior, 32 bit.
|
|
* Inputs: P0: memory address to use
|
|
* R0: value to ior
|
|
* Outputs: R0: new contents of the memory address.
|
|
* R1: previous contents of the memory address.
|
|
*/
|
|
ENTRY(_atomic_ior32)
|
|
R1 = [P0];
|
|
R0 = R1 | R0;
|
|
[P0] = R0;
|
|
rts;
|
|
ENDPROC (_atomic_ior32)
|
|
|
|
.align 16
|
|
/*
|
|
* Atomic and, 32 bit.
|
|
* Inputs: P0: memory address to use
|
|
* R0: value to and
|
|
* Outputs: R0: new contents of the memory address.
|
|
* R1: previous contents of the memory address.
|
|
*/
|
|
ENTRY(_atomic_and32)
|
|
R1 = [P0];
|
|
R0 = R1 & R0;
|
|
[P0] = R0;
|
|
rts;
|
|
ENDPROC (_atomic_and32)
|
|
|
|
.align 16
|
|
/*
|
|
* Atomic xor, 32 bit.
|
|
* Inputs: P0: memory address to use
|
|
* R0: value to xor
|
|
* Outputs: R0: new contents of the memory address.
|
|
* R1: previous contents of the memory address.
|
|
*/
|
|
ENTRY(_atomic_xor32)
|
|
R1 = [P0];
|
|
R0 = R1 ^ R0;
|
|
[P0] = R0;
|
|
rts;
|
|
ENDPROC (_atomic_xor32)
|
|
|
|
.align 16
|
|
/*
|
|
* safe_user_instruction
|
|
* Four NOPS are enough to allow the pipeline to speculativily load
|
|
* execute anything it wants. After that, things have gone bad, and
|
|
* we are stuck - so panic. Since we might be in user space, we can't
|
|
* call panic, so just cause a unhandled exception, this should cause
|
|
* a dump of the trace buffer so we can tell were we are, and a reboot
|
|
*/
|
|
ENTRY(_safe_user_instruction)
|
|
NOP; NOP; NOP; NOP;
|
|
EXCPT 0x4;
|
|
ENDPROC(_safe_user_instruction)
|
|
|
|
ENTRY(_fixed_code_end)
|
|
|
|
__FINIT
|