209 lines
3.7 KiB
C
209 lines
3.7 KiB
C
#include <linux/string.h>
|
|
#include <linux/module.h>
|
|
|
|
#undef memcpy
|
|
#undef memset
|
|
|
|
void *memcpy(void *to, const void *from, size_t n)
|
|
{
|
|
#ifdef CONFIG_X86_USE_3DNOW
|
|
return __memcpy3d(to, from, n);
|
|
#else
|
|
return __memcpy(to, from, n);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(memcpy);
|
|
|
|
void *memset(void *s, int c, size_t count)
|
|
{
|
|
return __memset(s, c, count);
|
|
}
|
|
EXPORT_SYMBOL(memset);
|
|
|
|
void *memmove(void *dest, const void *src, size_t n)
|
|
{
|
|
int d0,d1,d2,d3,d4,d5;
|
|
char *ret = dest;
|
|
|
|
__asm__ __volatile__(
|
|
/* Handle more 16bytes in loop */
|
|
"cmp $0x10, %0\n\t"
|
|
"jb 1f\n\t"
|
|
|
|
/* Decide forward/backward copy mode */
|
|
"cmp %2, %1\n\t"
|
|
"jb 2f\n\t"
|
|
|
|
/*
|
|
* movs instruction have many startup latency
|
|
* so we handle small size by general register.
|
|
*/
|
|
"cmp $680, %0\n\t"
|
|
"jb 3f\n\t"
|
|
/*
|
|
* movs instruction is only good for aligned case.
|
|
*/
|
|
"mov %1, %3\n\t"
|
|
"xor %2, %3\n\t"
|
|
"and $0xff, %3\n\t"
|
|
"jz 4f\n\t"
|
|
"3:\n\t"
|
|
"sub $0x10, %0\n\t"
|
|
|
|
/*
|
|
* We gobble 16byts forward in each loop.
|
|
*/
|
|
"3:\n\t"
|
|
"sub $0x10, %0\n\t"
|
|
"mov 0*4(%1), %3\n\t"
|
|
"mov 1*4(%1), %4\n\t"
|
|
"mov %3, 0*4(%2)\n\t"
|
|
"mov %4, 1*4(%2)\n\t"
|
|
"mov 2*4(%1), %3\n\t"
|
|
"mov 3*4(%1), %4\n\t"
|
|
"mov %3, 2*4(%2)\n\t"
|
|
"mov %4, 3*4(%2)\n\t"
|
|
"lea 0x10(%1), %1\n\t"
|
|
"lea 0x10(%2), %2\n\t"
|
|
"jae 3b\n\t"
|
|
"add $0x10, %0\n\t"
|
|
"jmp 1f\n\t"
|
|
|
|
/*
|
|
* Handle data forward by movs.
|
|
*/
|
|
".p2align 4\n\t"
|
|
"4:\n\t"
|
|
"mov -4(%1, %0), %3\n\t"
|
|
"lea -4(%2, %0), %4\n\t"
|
|
"shr $2, %0\n\t"
|
|
"rep movsl\n\t"
|
|
"mov %3, (%4)\n\t"
|
|
"jmp 11f\n\t"
|
|
/*
|
|
* Handle data backward by movs.
|
|
*/
|
|
".p2align 4\n\t"
|
|
"6:\n\t"
|
|
"mov (%1), %3\n\t"
|
|
"mov %2, %4\n\t"
|
|
"lea -4(%1, %0), %1\n\t"
|
|
"lea -4(%2, %0), %2\n\t"
|
|
"shr $2, %0\n\t"
|
|
"std\n\t"
|
|
"rep movsl\n\t"
|
|
"mov %3,(%4)\n\t"
|
|
"cld\n\t"
|
|
"jmp 11f\n\t"
|
|
|
|
/*
|
|
* Start to prepare for backward copy.
|
|
*/
|
|
".p2align 4\n\t"
|
|
"2:\n\t"
|
|
"cmp $680, %0\n\t"
|
|
"jb 5f\n\t"
|
|
"mov %1, %3\n\t"
|
|
"xor %2, %3\n\t"
|
|
"and $0xff, %3\n\t"
|
|
"jz 6b\n\t"
|
|
|
|
/*
|
|
* Calculate copy position to tail.
|
|
*/
|
|
"5:\n\t"
|
|
"add %0, %1\n\t"
|
|
"add %0, %2\n\t"
|
|
"sub $0x10, %0\n\t"
|
|
|
|
/*
|
|
* We gobble 16byts backward in each loop.
|
|
*/
|
|
"7:\n\t"
|
|
"sub $0x10, %0\n\t"
|
|
|
|
"mov -1*4(%1), %3\n\t"
|
|
"mov -2*4(%1), %4\n\t"
|
|
"mov %3, -1*4(%2)\n\t"
|
|
"mov %4, -2*4(%2)\n\t"
|
|
"mov -3*4(%1), %3\n\t"
|
|
"mov -4*4(%1), %4\n\t"
|
|
"mov %3, -3*4(%2)\n\t"
|
|
"mov %4, -4*4(%2)\n\t"
|
|
"lea -0x10(%1), %1\n\t"
|
|
"lea -0x10(%2), %2\n\t"
|
|
"jae 7b\n\t"
|
|
/*
|
|
* Calculate copy position to head.
|
|
*/
|
|
"add $0x10, %0\n\t"
|
|
"sub %0, %1\n\t"
|
|
"sub %0, %2\n\t"
|
|
|
|
/*
|
|
* Move data from 8 bytes to 15 bytes.
|
|
*/
|
|
".p2align 4\n\t"
|
|
"1:\n\t"
|
|
"cmp $8, %0\n\t"
|
|
"jb 8f\n\t"
|
|
"mov 0*4(%1), %3\n\t"
|
|
"mov 1*4(%1), %4\n\t"
|
|
"mov -2*4(%1, %0), %5\n\t"
|
|
"mov -1*4(%1, %0), %1\n\t"
|
|
|
|
"mov %3, 0*4(%2)\n\t"
|
|
"mov %4, 1*4(%2)\n\t"
|
|
"mov %5, -2*4(%2, %0)\n\t"
|
|
"mov %1, -1*4(%2, %0)\n\t"
|
|
"jmp 11f\n\t"
|
|
|
|
/*
|
|
* Move data from 4 bytes to 7 bytes.
|
|
*/
|
|
".p2align 4\n\t"
|
|
"8:\n\t"
|
|
"cmp $4, %0\n\t"
|
|
"jb 9f\n\t"
|
|
"mov 0*4(%1), %3\n\t"
|
|
"mov -1*4(%1, %0), %4\n\t"
|
|
"mov %3, 0*4(%2)\n\t"
|
|
"mov %4, -1*4(%2, %0)\n\t"
|
|
"jmp 11f\n\t"
|
|
|
|
/*
|
|
* Move data from 2 bytes to 3 bytes.
|
|
*/
|
|
".p2align 4\n\t"
|
|
"9:\n\t"
|
|
"cmp $2, %0\n\t"
|
|
"jb 10f\n\t"
|
|
"movw 0*2(%1), %%dx\n\t"
|
|
"movw -1*2(%1, %0), %%bx\n\t"
|
|
"movw %%dx, 0*2(%2)\n\t"
|
|
"movw %%bx, -1*2(%2, %0)\n\t"
|
|
"jmp 11f\n\t"
|
|
|
|
/*
|
|
* Move data for 1 byte.
|
|
*/
|
|
".p2align 4\n\t"
|
|
"10:\n\t"
|
|
"cmp $1, %0\n\t"
|
|
"jb 11f\n\t"
|
|
"movb (%1), %%cl\n\t"
|
|
"movb %%cl, (%2)\n\t"
|
|
".p2align 4\n\t"
|
|
"11:"
|
|
: "=&c" (d0), "=&S" (d1), "=&D" (d2),
|
|
"=r" (d3),"=r" (d4), "=r"(d5)
|
|
:"0" (n),
|
|
"1" (src),
|
|
"2" (dest)
|
|
:"memory");
|
|
|
|
return ret;
|
|
|
|
}
|
|
EXPORT_SYMBOL(memmove);
|