Contents of /trunk/mkinitrd-magellan/klibc/usr/klibc/memcpy.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 560 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
| 1 | /* |
| 2 | * memcpy.c |
| 3 | */ |
| 4 | |
| 5 | #include <string.h> |
| 6 | #include <stdint.h> |
| 7 | |
| 8 | void *memcpy(void *dst, const void *src, size_t n) |
| 9 | { |
| 10 | const char *p = src; |
| 11 | char *q = dst; |
| 12 | #if defined(__i386__) |
| 13 | size_t nl = n >> 2; |
| 14 | asm volatile ("cld ; rep ; movsl ; movl %3,%0 ; rep ; movsb":"+c" (nl), |
| 15 | "+S"(p), "+D"(q) |
| 16 | :"r"(n & 3)); |
| 17 | #elif defined(__x86_64__) |
| 18 | size_t nq = n >> 3; |
| 19 | asm volatile ("cld ; rep ; movsq ; movl %3,%%ecx ; rep ; movsb":"+c" |
| 20 | (nq), "+S"(p), "+D"(q) |
| 21 | :"r"((uint32_t) (n & 7))); |
| 22 | #else |
| 23 | while (n--) { |
| 24 | *q++ = *p++; |
| 25 | } |
| 26 | #endif |
| 27 | |
| 28 | return dst; |
| 29 | } |