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Diffstat (limited to 'arch/x86/include/asm/jump_label.h')
-rw-r--r--arch/x86/include/asm/jump_label.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
new file mode 100644
index 000000000000..a32b18ce6ead
--- /dev/null
+++ b/arch/x86/include/asm/jump_label.h
@@ -0,0 +1,42 @@
1#ifndef _ASM_X86_JUMP_LABEL_H
2#define _ASM_X86_JUMP_LABEL_H
3
4#ifdef __KERNEL__
5
6#include <linux/types.h>
7#include <asm/nops.h>
8#include <asm/asm.h>
9
10#define JUMP_LABEL_NOP_SIZE 5
11
12#define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
13
14static __always_inline bool arch_static_branch(struct jump_label_key *key)
15{
16 asm goto("1:"
17 JUMP_LABEL_INITIAL_NOP
18 ".pushsection __jump_table, \"aw\" \n\t"
19 _ASM_ALIGN "\n\t"
20 _ASM_PTR "1b, %l[l_yes], %c0 \n\t"
21 ".popsection \n\t"
22 : : "i" (key) : : l_yes);
23 return false;
24l_yes:
25 return true;
26}
27
28#endif /* __KERNEL__ */
29
30#ifdef CONFIG_X86_64
31typedef u64 jump_label_t;
32#else
33typedef u32 jump_label_t;
34#endif
35
36struct jump_entry {
37 jump_label_t code;
38 jump_label_t target;
39 jump_label_t key;
40};
41
42#endif