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/* SPDX-License-Identifier: GPL-2.0-only */
#include <linux/linkage.h>
#include <asm/export.h>
#include <asm/percpu.h>
#include <asm/processor-flags.h>
.text
#ifndef CONFIG_X86_CMPXCHG64
/*
* Emulate 'cmpxchg8b (%esi)' on UP
*
* Inputs:
* %esi : memory location to compare
* %eax : low 32 bits of old value
* %edx : high 32 bits of old value
* %ebx : low 32 bits of new value
* %ecx : high 32 bits of new value
*/
SYM_FUNC_START(cmpxchg8b_emu)
pushfl
cli
cmpl 0(%esi), %eax
jne .Lnot_same
cmpl 4(%esi), %edx
jne .Lnot_same
movl %ebx, 0(%esi)
movl %ecx, 4(%esi)
orl $X86_EFLAGS_ZF, (%esp)
popfl
RET
.Lnot_same:
movl 0(%esi), %eax
movl 4(%esi), %edx
andl $(~X86_EFLAGS_ZF), (%esp)
popfl
RET
SYM_FUNC_END(cmpxchg8b_emu)
EXPORT_SYMBOL(cmpxchg8b_emu)
#endif
#ifndef CONFIG_UML
SYM_FUNC_START(this_cpu_cmpxchg8b_emu)
pushfl
cli
cmpl PER_CPU_VAR(0(%esi)), %eax
jne .Lnot_same2
cmpl PER_CPU_VAR(4(%esi)), %edx
jne .Lnot_same2
movl %ebx, PER_CPU_VAR(0(%esi))
movl %ecx, PER_CPU_VAR(4(%esi))
orl $X86_EFLAGS_ZF, (%esp)
popfl
RET
.Lnot_same2:
movl PER_CPU_VAR(0(%esi)), %eax
movl PER_CPU_VAR(4(%esi)), %edx
andl $(~X86_EFLAGS_ZF), (%esp)
popfl
RET
SYM_FUNC_END(this_cpu_cmpxchg8b_emu)
#endif
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