| /* |
| * This file is part of the coreboot project. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #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; |
| } |