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#ifndef _ASM_X86_JUMP_LABEL_H
#define _ASM_X86_JUMP_LABEL_H
#ifndef __ASSEMBLY__
#include <linux/stringify.h>
#include <linux/types.h>
#include <asm/nops.h>
#include <asm/asm.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
static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm_volatile_goto("1:"
".byte " __stringify(STATIC_KEY_INIT_NOP) "
\t"
".pushsection __jump_table, \"aw\"
\t"
_ASM_ALIGN "
\t"
_ASM_PTR "1b, %l[l_yes], %c0 + %c1
\t"
".popsection
\t"
: : "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("1:"
".byte 0xe9
\t .long %l[l_yes] - 2f
\t"
"2:
\t"
".pushsection __jump_table, \"aw\"
\t"
_ASM_ALIGN "
\t"
_ASM_PTR "1b, %l[l_yes], %c0 + %c1
\t"
".popsection
\t"
: : "i" (key), "i" (branch) : : l_yes);
return false;
l_yes:
return true;
}
#ifdef CONFIG_X86_64
typedef u64 jump_label_t;
#else
typedef u32 jump_label_t;
#endif
struct jump_entry {
jump_label_t code;
jump_label_t target;
jump_label_t key;
};
#endif /* __ASSEMBLY__ */
#endif
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