switch-coreboot/src/arch/x86/lib/memcpy.c
Stefan Reinauer 7c35af2bc3 x86: make memcpy 64bit safe
This does not optimize memcpy for 64bit, it merely makes it compile.

Change-Id: I69ad6bd0c3d5f617d9222643abf7a2ba7c2a0359
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Signed-off-by: Scott Duplichan <scott@notabs.org>
Reviewed-on: http://review.coreboot.org/10575
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
2015-06-20 18:15:01 +02:00

22 lines
378 B
C

#include <string.h>
void *memcpy(void *dest, const void *src, size_t n)
{
unsigned long d0, d1, d2;
asm volatile(
#ifdef __x86_64__
"rep ; movsd\n\t"
"mov %4,%%rcx\n\t"
#else
"rep ; movsl\n\t"
"movl %4,%%ecx\n\t"
#endif
"rep ; movsb\n\t"
: "=&c" (d0), "=&D" (d1), "=&S" (d2)
: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
: "memory"
);
return dest;
}