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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_JUMP_LABEL_H
#define _ASM_X86_JUMP_LABEL_H
#define JUMP_LABEL_NOP_SIZE 5
#ifdef CONFIG_X86_64
# define STATIC_KEY_INIT_NOP P6_NOP5_ATOMIC
#else
# define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC
#endif
#include <asm/asm.h>
#include <asm/nops.h>
#ifndef __ASSEMBLY__
#include <linux/stringify.h>
#include <linux/types.h>
static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm_volatile_goto("STATIC_BRANCH_NOP l_yes=\"%l[l_yes]\" key=\"%c0\" "
"branch=\"%c1\""
: : "i" (key), "i" (branch) : : l_yes);
return false;
l_yes:
return true;
}
static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
{
asm_volatile_goto("STATIC_BRANCH_JMP l_yes=\"%l[l_yes]\" key=\"%c0\" "
"branch=\"%c1\""
: : "i" (key), "i" (branch) : : l_yes);
return false;
l_yes:
return true;
}
#else /* __ASSEMBLY__ */
.macro STATIC_BRANCH_NOP l_yes:req key:req branch:req
.Lstatic_branch_nop_\@:
.byte STATIC_KEY_INIT_NOP
.Lstatic_branch_no_after_\@:
.pushsection __jump_table, "aw"
_ASM_ALIGN
.long .Lstatic_branch_nop_\@ - ., \l_yes - .
_ASM_PTR \key + \branch - .
.popsection
.endm
.macro STATIC_BRANCH_JMP l_yes:req key:req branch:req
.Lstatic_branch_jmp_\@:
.byte 0xe9
.long \l_yes - .Lstatic_branch_jmp_after_\@
.Lstatic_branch_jmp_after_\@:
.pushsection __jump_table, "aw"
_ASM_ALIGN
.long .Lstatic_branch_jmp_\@ - ., \l_yes - .
_ASM_PTR \key + \branch - .
.popsection
.endm
#endif /* __ASSEMBLY__ */
#endif
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