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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>
This commit is contained in:
Stefan Reinauer 2015-06-17 16:09:10 -07:00
parent 7979dc09a8
commit 7c35af2bc3
1 changed files with 5 additions and 0 deletions
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5
src/arch/x86/lib/memcpy.c
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@ -5,8 +5,13 @@ void *memcpy(void *dest, const void *src, size_t n)
unsigned long d0, d1, d2; unsigned long d0, d1, d2;
asm volatile( asm volatile(
#ifdef __x86_64__
"rep ; movsd\n\t"
"mov %4,%%rcx\n\t"
#else
"rep ; movsl\n\t" "rep ; movsl\n\t"
"movl %4,%%ecx\n\t" "movl %4,%%ecx\n\t"
#endif
"rep ; movsb\n\t" "rep ; movsb\n\t"
: "=&c" (d0), "=&D" (d1), "=&S" (d2) : "=&c" (d0), "=&D" (d1), "=&S" (d2)
: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src) : "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)