404 lines
8.3 KiB
C
404 lines
8.3 KiB
C
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/i387.h>
|
|
|
|
|
|
/*
|
|
* MMX 3DNow! library helper functions
|
|
*
|
|
* To do:
|
|
* We can use MMX just for prefetch in IRQ's. This may be a win.
|
|
* (reported so on K6-III)
|
|
* We should use a better code neutral filler for the short jump
|
|
* leal ebx. [ebx] is apparently best for K6-2, but Cyrix ??
|
|
* We also want to clobber the filler register so we don't get any
|
|
* register forwarding stalls on the filler.
|
|
*
|
|
* Add *user handling. Checksums are not a win with MMX on any CPU
|
|
* tested so far for any MMX solution figured.
|
|
*
|
|
* 22/09/2000 - Arjan van de Ven
|
|
* Improved for non-egineering-sample Athlons
|
|
*
|
|
*/
|
|
|
|
void *_mmx_memcpy(void *to, const void *from, size_t len)
|
|
{
|
|
void *p;
|
|
int i;
|
|
|
|
if (unlikely(in_interrupt()))
|
|
return __memcpy(to, from, len);
|
|
|
|
p = to;
|
|
i = len >> 6; /* len/64 */
|
|
|
|
kernel_fpu_begin();
|
|
|
|
__asm__ __volatile__ (
|
|
"1: prefetch (%0)\n" /* This set is 28 bytes */
|
|
" prefetch 64(%0)\n"
|
|
" prefetch 128(%0)\n"
|
|
" prefetch 192(%0)\n"
|
|
" prefetch 256(%0)\n"
|
|
"2: \n"
|
|
".section .fixup, \"ax\"\n"
|
|
"3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
|
|
" jmp 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b, 3b\n"
|
|
".previous"
|
|
: : "r" (from) );
|
|
|
|
|
|
for(; i>5; i--)
|
|
{
|
|
__asm__ __volatile__ (
|
|
"1: prefetch 320(%0)\n"
|
|
"2: movq (%0), %%mm0\n"
|
|
" movq 8(%0), %%mm1\n"
|
|
" movq 16(%0), %%mm2\n"
|
|
" movq 24(%0), %%mm3\n"
|
|
" movq %%mm0, (%1)\n"
|
|
" movq %%mm1, 8(%1)\n"
|
|
" movq %%mm2, 16(%1)\n"
|
|
" movq %%mm3, 24(%1)\n"
|
|
" movq 32(%0), %%mm0\n"
|
|
" movq 40(%0), %%mm1\n"
|
|
" movq 48(%0), %%mm2\n"
|
|
" movq 56(%0), %%mm3\n"
|
|
" movq %%mm0, 32(%1)\n"
|
|
" movq %%mm1, 40(%1)\n"
|
|
" movq %%mm2, 48(%1)\n"
|
|
" movq %%mm3, 56(%1)\n"
|
|
".section .fixup, \"ax\"\n"
|
|
"3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
|
|
" jmp 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b, 3b\n"
|
|
".previous"
|
|
: : "r" (from), "r" (to) : "memory");
|
|
from+=64;
|
|
to+=64;
|
|
}
|
|
|
|
for(; i>0; i--)
|
|
{
|
|
__asm__ __volatile__ (
|
|
" movq (%0), %%mm0\n"
|
|
" movq 8(%0), %%mm1\n"
|
|
" movq 16(%0), %%mm2\n"
|
|
" movq 24(%0), %%mm3\n"
|
|
" movq %%mm0, (%1)\n"
|
|
" movq %%mm1, 8(%1)\n"
|
|
" movq %%mm2, 16(%1)\n"
|
|
" movq %%mm3, 24(%1)\n"
|
|
" movq 32(%0), %%mm0\n"
|
|
" movq 40(%0), %%mm1\n"
|
|
" movq 48(%0), %%mm2\n"
|
|
" movq 56(%0), %%mm3\n"
|
|
" movq %%mm0, 32(%1)\n"
|
|
" movq %%mm1, 40(%1)\n"
|
|
" movq %%mm2, 48(%1)\n"
|
|
" movq %%mm3, 56(%1)\n"
|
|
: : "r" (from), "r" (to) : "memory");
|
|
from+=64;
|
|
to+=64;
|
|
}
|
|
/*
|
|
* Now do the tail of the block
|
|
*/
|
|
__memcpy(to, from, len&63);
|
|
kernel_fpu_end();
|
|
return p;
|
|
}
|
|
|
|
#ifdef CONFIG_MK7
|
|
|
|
/*
|
|
* The K7 has streaming cache bypass load/store. The Cyrix III, K6 and
|
|
* other MMX using processors do not.
|
|
*/
|
|
|
|
static void fast_clear_page(void *page)
|
|
{
|
|
int i;
|
|
|
|
kernel_fpu_begin();
|
|
|
|
__asm__ __volatile__ (
|
|
" pxor %%mm0, %%mm0\n" : :
|
|
);
|
|
|
|
for(i=0;i<4096/64;i++)
|
|
{
|
|
__asm__ __volatile__ (
|
|
" movntq %%mm0, (%0)\n"
|
|
" movntq %%mm0, 8(%0)\n"
|
|
" movntq %%mm0, 16(%0)\n"
|
|
" movntq %%mm0, 24(%0)\n"
|
|
" movntq %%mm0, 32(%0)\n"
|
|
" movntq %%mm0, 40(%0)\n"
|
|
" movntq %%mm0, 48(%0)\n"
|
|
" movntq %%mm0, 56(%0)\n"
|
|
: : "r" (page) : "memory");
|
|
page+=64;
|
|
}
|
|
/* since movntq is weakly-ordered, a "sfence" is needed to become
|
|
* ordered again.
|
|
*/
|
|
__asm__ __volatile__ (
|
|
" sfence \n" : :
|
|
);
|
|
kernel_fpu_end();
|
|
}
|
|
|
|
static void fast_copy_page(void *to, void *from)
|
|
{
|
|
int i;
|
|
|
|
kernel_fpu_begin();
|
|
|
|
/* maybe the prefetch stuff can go before the expensive fnsave...
|
|
* but that is for later. -AV
|
|
*/
|
|
__asm__ __volatile__ (
|
|
"1: prefetch (%0)\n"
|
|
" prefetch 64(%0)\n"
|
|
" prefetch 128(%0)\n"
|
|
" prefetch 192(%0)\n"
|
|
" prefetch 256(%0)\n"
|
|
"2: \n"
|
|
".section .fixup, \"ax\"\n"
|
|
"3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
|
|
" jmp 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b, 3b\n"
|
|
".previous"
|
|
: : "r" (from) );
|
|
|
|
for(i=0; i<(4096-320)/64; i++)
|
|
{
|
|
__asm__ __volatile__ (
|
|
"1: prefetch 320(%0)\n"
|
|
"2: movq (%0), %%mm0\n"
|
|
" movntq %%mm0, (%1)\n"
|
|
" movq 8(%0), %%mm1\n"
|
|
" movntq %%mm1, 8(%1)\n"
|
|
" movq 16(%0), %%mm2\n"
|
|
" movntq %%mm2, 16(%1)\n"
|
|
" movq 24(%0), %%mm3\n"
|
|
" movntq %%mm3, 24(%1)\n"
|
|
" movq 32(%0), %%mm4\n"
|
|
" movntq %%mm4, 32(%1)\n"
|
|
" movq 40(%0), %%mm5\n"
|
|
" movntq %%mm5, 40(%1)\n"
|
|
" movq 48(%0), %%mm6\n"
|
|
" movntq %%mm6, 48(%1)\n"
|
|
" movq 56(%0), %%mm7\n"
|
|
" movntq %%mm7, 56(%1)\n"
|
|
".section .fixup, \"ax\"\n"
|
|
"3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
|
|
" jmp 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b, 3b\n"
|
|
".previous"
|
|
: : "r" (from), "r" (to) : "memory");
|
|
from+=64;
|
|
to+=64;
|
|
}
|
|
for(i=(4096-320)/64; i<4096/64; i++)
|
|
{
|
|
__asm__ __volatile__ (
|
|
"2: movq (%0), %%mm0\n"
|
|
" movntq %%mm0, (%1)\n"
|
|
" movq 8(%0), %%mm1\n"
|
|
" movntq %%mm1, 8(%1)\n"
|
|
" movq 16(%0), %%mm2\n"
|
|
" movntq %%mm2, 16(%1)\n"
|
|
" movq 24(%0), %%mm3\n"
|
|
" movntq %%mm3, 24(%1)\n"
|
|
" movq 32(%0), %%mm4\n"
|
|
" movntq %%mm4, 32(%1)\n"
|
|
" movq 40(%0), %%mm5\n"
|
|
" movntq %%mm5, 40(%1)\n"
|
|
" movq 48(%0), %%mm6\n"
|
|
" movntq %%mm6, 48(%1)\n"
|
|
" movq 56(%0), %%mm7\n"
|
|
" movntq %%mm7, 56(%1)\n"
|
|
: : "r" (from), "r" (to) : "memory");
|
|
from+=64;
|
|
to+=64;
|
|
}
|
|
/* since movntq is weakly-ordered, a "sfence" is needed to become
|
|
* ordered again.
|
|
*/
|
|
__asm__ __volatile__ (
|
|
" sfence \n" : :
|
|
);
|
|
kernel_fpu_end();
|
|
}
|
|
|
|
#else
|
|
|
|
/*
|
|
* Generic MMX implementation without K7 specific streaming
|
|
*/
|
|
|
|
static void fast_clear_page(void *page)
|
|
{
|
|
int i;
|
|
|
|
kernel_fpu_begin();
|
|
|
|
__asm__ __volatile__ (
|
|
" pxor %%mm0, %%mm0\n" : :
|
|
);
|
|
|
|
for(i=0;i<4096/128;i++)
|
|
{
|
|
__asm__ __volatile__ (
|
|
" movq %%mm0, (%0)\n"
|
|
" movq %%mm0, 8(%0)\n"
|
|
" movq %%mm0, 16(%0)\n"
|
|
" movq %%mm0, 24(%0)\n"
|
|
" movq %%mm0, 32(%0)\n"
|
|
" movq %%mm0, 40(%0)\n"
|
|
" movq %%mm0, 48(%0)\n"
|
|
" movq %%mm0, 56(%0)\n"
|
|
" movq %%mm0, 64(%0)\n"
|
|
" movq %%mm0, 72(%0)\n"
|
|
" movq %%mm0, 80(%0)\n"
|
|
" movq %%mm0, 88(%0)\n"
|
|
" movq %%mm0, 96(%0)\n"
|
|
" movq %%mm0, 104(%0)\n"
|
|
" movq %%mm0, 112(%0)\n"
|
|
" movq %%mm0, 120(%0)\n"
|
|
: : "r" (page) : "memory");
|
|
page+=128;
|
|
}
|
|
|
|
kernel_fpu_end();
|
|
}
|
|
|
|
static void fast_copy_page(void *to, void *from)
|
|
{
|
|
int i;
|
|
|
|
|
|
kernel_fpu_begin();
|
|
|
|
__asm__ __volatile__ (
|
|
"1: prefetch (%0)\n"
|
|
" prefetch 64(%0)\n"
|
|
" prefetch 128(%0)\n"
|
|
" prefetch 192(%0)\n"
|
|
" prefetch 256(%0)\n"
|
|
"2: \n"
|
|
".section .fixup, \"ax\"\n"
|
|
"3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
|
|
" jmp 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b, 3b\n"
|
|
".previous"
|
|
: : "r" (from) );
|
|
|
|
for(i=0; i<4096/64; i++)
|
|
{
|
|
__asm__ __volatile__ (
|
|
"1: prefetch 320(%0)\n"
|
|
"2: movq (%0), %%mm0\n"
|
|
" movq 8(%0), %%mm1\n"
|
|
" movq 16(%0), %%mm2\n"
|
|
" movq 24(%0), %%mm3\n"
|
|
" movq %%mm0, (%1)\n"
|
|
" movq %%mm1, 8(%1)\n"
|
|
" movq %%mm2, 16(%1)\n"
|
|
" movq %%mm3, 24(%1)\n"
|
|
" movq 32(%0), %%mm0\n"
|
|
" movq 40(%0), %%mm1\n"
|
|
" movq 48(%0), %%mm2\n"
|
|
" movq 56(%0), %%mm3\n"
|
|
" movq %%mm0, 32(%1)\n"
|
|
" movq %%mm1, 40(%1)\n"
|
|
" movq %%mm2, 48(%1)\n"
|
|
" movq %%mm3, 56(%1)\n"
|
|
".section .fixup, \"ax\"\n"
|
|
"3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
|
|
" jmp 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b, 3b\n"
|
|
".previous"
|
|
: : "r" (from), "r" (to) : "memory");
|
|
from+=64;
|
|
to+=64;
|
|
}
|
|
kernel_fpu_end();
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Favour MMX for page clear and copy.
|
|
*/
|
|
|
|
static void slow_zero_page(void * page)
|
|
{
|
|
int d0, d1;
|
|
__asm__ __volatile__( \
|
|
"cld\n\t" \
|
|
"rep ; stosl" \
|
|
: "=&c" (d0), "=&D" (d1)
|
|
:"a" (0),"1" (page),"0" (1024)
|
|
:"memory");
|
|
}
|
|
|
|
void mmx_clear_page(void * page)
|
|
{
|
|
if(unlikely(in_interrupt()))
|
|
slow_zero_page(page);
|
|
else
|
|
fast_clear_page(page);
|
|
}
|
|
|
|
static void slow_copy_page(void *to, void *from)
|
|
{
|
|
int d0, d1, d2;
|
|
__asm__ __volatile__( \
|
|
"cld\n\t" \
|
|
"rep ; movsl" \
|
|
: "=&c" (d0), "=&D" (d1), "=&S" (d2) \
|
|
: "0" (1024),"1" ((long) to),"2" ((long) from) \
|
|
: "memory");
|
|
}
|
|
|
|
|
|
void mmx_copy_page(void *to, void *from)
|
|
{
|
|
if(unlikely(in_interrupt()))
|
|
slow_copy_page(to, from);
|
|
else
|
|
fast_copy_page(to, from);
|
|
}
|
|
|
|
EXPORT_SYMBOL(_mmx_memcpy);
|
|
EXPORT_SYMBOL(mmx_clear_page);
|
|
EXPORT_SYMBOL(mmx_copy_page);
|