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Linux/arch/x86/include/asm/string_64.h

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  1 #ifndef _ASM_X86_STRING_64_H
  2 #define _ASM_X86_STRING_64_H
  3 
  4 #ifdef __KERNEL__
  5 
  6 /* Written 2002 by Andi Kleen */
  7 
  8 /* Only used for special circumstances. Stolen from i386/string.h */
  9 static __always_inline void *__inline_memcpy(void *to, const void *from, size_t n)
 10 {
 11         unsigned long d0, d1, d2;
 12         asm volatile("rep ; movsl\n\t"
 13                      "testb $2,%b4\n\t"
 14                      "je 1f\n\t"
 15                      "movsw\n"
 16                      "1:\ttestb $1,%b4\n\t"
 17                      "je 2f\n\t"
 18                      "movsb\n"
 19                      "2:"
 20                      : "=&c" (d0), "=&D" (d1), "=&S" (d2)
 21                      : "" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
 22                      : "memory");
 23         return to;
 24 }
 25 
 26 /* Even with __builtin_ the compiler may decide to use the out of line
 27    function. */
 28 
 29 #define __HAVE_ARCH_MEMCPY 1
 30 #ifndef CONFIG_KMEMCHECK
 31 #if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
 32 extern void *memcpy(void *to, const void *from, size_t len);
 33 #else
 34 extern void *__memcpy(void *to, const void *from, size_t len);
 35 #define memcpy(dst, src, len)                                   \
 36 ({                                                              \
 37         size_t __len = (len);                                   \
 38         void *__ret;                                            \
 39         if (__builtin_constant_p(len) && __len >= 64)           \
 40                 __ret = __memcpy((dst), (src), __len);          \
 41         else                                                    \
 42                 __ret = __builtin_memcpy((dst), (src), __len);  \
 43         __ret;                                                  \
 44 })
 45 #endif
 46 #else
 47 /*
 48  * kmemcheck becomes very happy if we use the REP instructions unconditionally,
 49  * because it means that we know both memory operands in advance.
 50  */
 51 #define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len))
 52 #endif
 53 
 54 #define __HAVE_ARCH_MEMSET
 55 void *memset(void *s, int c, size_t n);
 56 
 57 #define __HAVE_ARCH_MEMMOVE
 58 void *memmove(void *dest, const void *src, size_t count);
 59 
 60 int memcmp(const void *cs, const void *ct, size_t count);
 61 size_t strlen(const char *s);
 62 char *strcpy(char *dest, const char *src);
 63 char *strcat(char *dest, const char *src);
 64 int strcmp(const char *cs, const char *ct);
 65 
 66 #endif /* __KERNEL__ */
 67 
 68 #endif /* _ASM_X86_STRING_64_H */
 69 

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