diff options
Diffstat (limited to 'libs/libc/mem.c')
| -rw-r--r-- | libs/libc/mem.c | 54 |
1 files changed, 6 insertions, 48 deletions
diff --git a/libs/libc/mem.c b/libs/libc/mem.c index babec3a..080c88d 100644 --- a/libs/libc/mem.c +++ b/libs/libc/mem.c @@ -7,38 +7,6 @@ void *memcpy(void *dest, const void *src, u32 n) { -#ifdef USER - // Inspired by Jeko at osdev - u8 *dest_byte = dest; - const u8 *src_byte = src; - for (u32 i = 0; i < n / 16; i++) { - __asm__ volatile("movups (%0), %%xmm0\n" - "movntdq %%xmm0, (%1)\n" ::"r"(src_byte), - "r"(dest_byte) - : "memory"); - - src_byte += 16; - dest_byte += 16; - } - - if (n & 7) { - n = n & 7; - - int d0, d1, d2; - __asm__ volatile("rep ; movsl\n\t" - "testb $2,%b4\n\t" - "je 1f\n\t" - "movsw\n" - "1:\ttestb $1,%b4\n\t" - "je 2f\n\t" - "movsb\n" - "2:" - : "=&c"(d0), "=&D"(d1), "=&S"(d2) - : "0"(n / 4), "q"(n), "1"((long)dest_byte), "2"((long)src_byte) - : "memory"); - } - return dest_byte; -#else // Inspired by jgraef at osdev u32 num_dwords = n / 4; u32 num_bytes = n % 4; @@ -47,25 +15,20 @@ void *memcpy(void *dest, const void *src, u32 n) u8 *dest8 = ((u8 *)dest) + num_dwords * 4; const u8 *src8 = ((const u8 *)src) + num_dwords * 4; - // TODO: What's faster? __asm__ volatile("rep movsl\n" : "=S"(src32), "=D"(dest32), "=c"(num_dwords) : "S"(src32), "D"(dest32), "c"(num_dwords) : "memory"); - /* for (u32 i = 0; i < num_dwords; i++) { */ - /* dest32[i] = src32[i]; */ - /* } */ - - for (u32 i = 0; i < num_bytes; i++) { + for (u32 i = 0; i < num_bytes; i++) dest8[i] = src8[i]; - } + return dest; -#endif } void *memset(void *dest, u32 val, u32 n) { + // Inspired by jgraef at osdev u32 uval = val; u32 num_dwords = n / 4; u32 num_bytes = n % 4; @@ -74,19 +37,14 @@ void *memset(void *dest, u32 val, u32 n) u8 val8 = (u8)val; u32 val32 = uval | (uval << 8) | (uval << 16) | (uval << 24); - // TODO: What's faster? __asm__ volatile("rep stosl\n" : "=D"(dest32), "=c"(num_dwords) : "D"(dest32), "c"(num_dwords), "a"(val32) : "memory"); - /* for (u32 i = 0; i < num_dwords; i++) { */ - /* dest32[i] = val32; */ - /* } */ - - for (u32 i = 0; i < num_bytes; i++) { + for (u32 i = 0; i < num_bytes; i++) dest8[i] = val8; - } + return dest; } @@ -122,7 +80,7 @@ u8 mememp(const u8 *buf, u32 n) #ifdef KERNEL -#include <cpu.h> +#include <drivers/cpu.h> void *memcpy_user(void *dest, const void *src, u32 n) { |