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string: better memset and memcpy

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Matheus
2024-08-21 23:23:58 -03:00
parent e0813e0701
commit fb24745071
1 changed files with 8 additions and 2 deletions
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kernel-src/lib/string.c
+8 -2
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@@ -3,20 +3,26 @@
#include <stdint.h> #include <stdint.h>
void *memcpy(void *d, void *s, size_t c) { void *memcpy(void *d, void *s, size_t c) {
#ifdef __x86_64__
asm volatile ("rep movsb" : : "S"(s), "D"(d), "c"(c) : "memory");
#else
uint8_t *sc = (uint8_t *)s; uint8_t *sc = (uint8_t *)s;
uint8_t *dc = (uint8_t *)d; uint8_t *dc = (uint8_t *)d;
while (c--) while (c--)
*dc++ = *sc++; *dc++ = *sc++;
#endif
return d; return d;
} }
void *memset(void *ptr, unsigned long value, size_t num) { void *memset(void *ptr, unsigned long value, size_t num) {
#ifdef __x86_64__
asm volatile ("rep stosb" : : "D"(ptr), "a"(value), "c"(num) : "memory");
#else
char *p = (char *)ptr; char *p = (char *)ptr;
while (num--) while (num--)
*p++ = value; *p++ = value;
#endif
return ptr; return ptr;
} }