projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d9f5ab7b JB |
1 | #ifndef _ASM_X86_JUMP_LABEL_H |
| 2 | #define _ASM_X86_JUMP_LABEL_H | |
| 3 | ||
| 4 | #ifdef __KERNEL__ | |
| 5 | ||
| c3c7f14a | 6 | #include <linux/stringify.h> |
| d9f5ab7b JB |
7 | #include <linux/types.h> |
| 8 | #include <asm/nops.h> | |
| d430d3d7 | 9 | #include <asm/asm.h> |
| d9f5ab7b JB |
10 | |
| 11 | #define JUMP_LABEL_NOP_SIZE 5 | |
| 12 | ||
| c3c7f14a SR |
13 | #ifdef CONFIG_X86_64 |
| 14 | # define STATIC_KEY_INIT_NOP P6_NOP5_ATOMIC | |
| 15 | #else | |
| 16 | # define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC | |
| 17 | #endif | |
| d430d3d7 | 18 | |
| c5905afb | 19 | static __always_inline bool arch_static_branch(struct static_key *key) |
| d430d3d7 | 20 | { |
| 3f0116c3 | 21 | asm_volatile_goto("1:" |
| c3c7f14a | 22 | ".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t" |
| d430d3d7 | 23 | ".pushsection __jump_table, \"aw\" \n\t" |
| ef647894 | 24 | _ASM_ALIGN "\n\t" |
| d430d3d7 JB |
25 | _ASM_PTR "1b, %l[l_yes], %c0 \n\t" |
| 26 | ".popsection \n\t" | |
| 27 | : : "i" (key) : : l_yes); | |
| 28 | return false; | |
| 29 | l_yes: | |
| 30 | return true; | |
| 31 | } | |
| d9f5ab7b JB |
32 | |
| 33 | #endif /* __KERNEL__ */ | |
| 34 | ||
| 35 | #ifdef CONFIG_X86_64 | |
| d9f5ab7b | 36 | typedef u64 jump_label_t; |
| d9f5ab7b | 37 | #else |
| d9f5ab7b | 38 | typedef u32 jump_label_t; |
| 95fccd46 | 39 | #endif |
| d9f5ab7b JB |
40 | |
| 41 | struct jump_entry { | |
| 42 | jump_label_t code; | |
| 43 | jump_label_t target; | |
| 44 | jump_label_t key; | |
| 45 | }; | |
| 46 | ||
| 47 | #endif |