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Linux/arch/x86/include/asm/jump_label.h

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  1 #ifndef _ASM_X86_JUMP_LABEL_H
  2 #define _ASM_X86_JUMP_LABEL_H
  3 
  4 #ifdef __KERNEL__
  5 
  6 #include <linux/stringify.h>
  7 #include <linux/types.h>
  8 #include <asm/nops.h>
  9 #include <asm/asm.h>
 10 
 11 #define JUMP_LABEL_NOP_SIZE 5
 12 
 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
 18 
 19 static __always_inline bool arch_static_branch(struct static_key *key)
 20 {
 21         asm_volatile_goto("1:"
 22                 ".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t"
 23                 ".pushsection __jump_table,  \"aw\" \n\t"
 24                 _ASM_ALIGN "\n\t"
 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 }
 32 
 33 #endif /* __KERNEL__ */
 34 
 35 #ifdef CONFIG_X86_64
 36 typedef u64 jump_label_t;
 37 #else
 38 typedef u32 jump_label_t;
 39 #endif
 40 
 41 struct jump_entry {
 42         jump_label_t code;
 43         jump_label_t target;
 44         jump_label_t key;
 45 };
 46 
 47 #endif
 48 

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