diff options
Diffstat (limited to 'arch/x86/lib/memcpy_32.c')
-rw-r--r-- | arch/x86/lib/memcpy_32.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/x86/lib/memcpy_32.c b/arch/x86/lib/memcpy_32.c new file mode 100644 index 000000000000..8ac51b82a632 --- /dev/null +++ b/arch/x86/lib/memcpy_32.c @@ -0,0 +1,43 @@ +#include <linux/string.h> +#include <linux/module.h> + +#undef memcpy +#undef memset + +void *memcpy(void *to, const void *from, size_t n) +{ +#ifdef CONFIG_X86_USE_3DNOW + return __memcpy3d(to, from, n); +#else + return __memcpy(to, from, n); +#endif +} +EXPORT_SYMBOL(memcpy); + +void *memset(void *s, int c, size_t count) +{ + return __memset(s, c, count); +} +EXPORT_SYMBOL(memset); + +void *memmove(void *dest, const void *src, size_t n) +{ + int d0, d1, d2; + + if (dest < src) { + memcpy(dest,src,n); + } else { + __asm__ __volatile__( + "std\n\t" + "rep\n\t" + "movsb\n\t" + "cld" + : "=&c" (d0), "=&S" (d1), "=&D" (d2) + :"0" (n), + "1" (n-1+(const char *)src), + "2" (n-1+(char *)dest) + :"memory"); + } + return dest; +} +EXPORT_SYMBOL(memmove); |