mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
150 lines
4 KiB
C
150 lines
4 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* Copyright 2002 H. Peter Anvin - All Rights Reserved
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
|
|
* Bostom MA 02111-1307, USA; either version 2 of the License, or
|
|
* (at your option) any later version; incorporated herein by reference.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* raid6mmx.c
|
|
*
|
|
* MMX implementation of RAID-6 syndrome functions
|
|
*/
|
|
|
|
#if defined(__i386__)
|
|
|
|
#include "raid6.h"
|
|
#include "raid6x86.h"
|
|
|
|
/* Shared with raid6sse1.c */
|
|
const struct raid6_mmx_constants {
|
|
u64 x1d;
|
|
} raid6_mmx_constants = {
|
|
0x1d1d1d1d1d1d1d1dULL,
|
|
};
|
|
|
|
static int raid6_have_mmx(void)
|
|
{
|
|
#ifdef __KERNEL__
|
|
/* Not really "boot_cpu" but "all_cpus" */
|
|
return boot_cpu_has(X86_FEATURE_MMX);
|
|
#else
|
|
/* User space test code */
|
|
u32 features = cpuid_features();
|
|
return ( (features & (1<<23)) == (1<<23) );
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Plain MMX implementation
|
|
*/
|
|
static void raid6_mmx1_gen_syndrome(int disks, size_t bytes, void **ptrs)
|
|
{
|
|
u8 **dptr = (u8 **)ptrs;
|
|
u8 *p, *q;
|
|
int d, z, z0;
|
|
raid6_mmx_save_t sa;
|
|
|
|
z0 = disks - 3; /* Highest data disk */
|
|
p = dptr[z0+1]; /* XOR parity */
|
|
q = dptr[z0+2]; /* RS syndrome */
|
|
|
|
raid6_before_mmx(&sa);
|
|
|
|
asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants.x1d));
|
|
asm volatile("pxor %mm5,%mm5"); /* Zero temp */
|
|
|
|
for ( d = 0 ; d < bytes ; d += 8 ) {
|
|
asm volatile("movq %0,%%mm2" : : "m" (dptr[z0][d])); /* P[0] */
|
|
asm volatile("movq %mm2,%mm4"); /* Q[0] */
|
|
for ( z = z0-1 ; z >= 0 ; z-- ) {
|
|
asm volatile("movq %0,%%mm6" : : "m" (dptr[z][d]));
|
|
asm volatile("pcmpgtb %mm4,%mm5");
|
|
asm volatile("paddb %mm4,%mm4");
|
|
asm volatile("pand %mm0,%mm5");
|
|
asm volatile("pxor %mm5,%mm4");
|
|
asm volatile("pxor %mm5,%mm5");
|
|
asm volatile("pxor %mm6,%mm2");
|
|
asm volatile("pxor %mm6,%mm4");
|
|
}
|
|
asm volatile("movq %%mm2,%0" : "=m" (p[d]));
|
|
asm volatile("pxor %mm2,%mm2");
|
|
asm volatile("movq %%mm4,%0" : "=m" (q[d]));
|
|
asm volatile("pxor %mm4,%mm4");
|
|
}
|
|
|
|
raid6_after_mmx(&sa);
|
|
}
|
|
|
|
const struct raid6_calls raid6_mmxx1 = {
|
|
raid6_mmx1_gen_syndrome,
|
|
raid6_have_mmx,
|
|
"mmxx1",
|
|
0
|
|
};
|
|
|
|
/*
|
|
* Unrolled-by-2 MMX implementation
|
|
*/
|
|
static void raid6_mmx2_gen_syndrome(int disks, size_t bytes, void **ptrs)
|
|
{
|
|
u8 **dptr = (u8 **)ptrs;
|
|
u8 *p, *q;
|
|
int d, z, z0;
|
|
raid6_mmx_save_t sa;
|
|
|
|
z0 = disks - 3; /* Highest data disk */
|
|
p = dptr[z0+1]; /* XOR parity */
|
|
q = dptr[z0+2]; /* RS syndrome */
|
|
|
|
raid6_before_mmx(&sa);
|
|
|
|
asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants.x1d));
|
|
asm volatile("pxor %mm5,%mm5"); /* Zero temp */
|
|
asm volatile("pxor %mm7,%mm7"); /* Zero temp */
|
|
|
|
for ( d = 0 ; d < bytes ; d += 16 ) {
|
|
asm volatile("movq %0,%%mm2" : : "m" (dptr[z0][d])); /* P[0] */
|
|
asm volatile("movq %0,%%mm3" : : "m" (dptr[z0][d+8]));
|
|
asm volatile("movq %mm2,%mm4"); /* Q[0] */
|
|
asm volatile("movq %mm3,%mm6"); /* Q[1] */
|
|
for ( z = z0-1 ; z >= 0 ; z-- ) {
|
|
asm volatile("pcmpgtb %mm4,%mm5");
|
|
asm volatile("pcmpgtb %mm6,%mm7");
|
|
asm volatile("paddb %mm4,%mm4");
|
|
asm volatile("paddb %mm6,%mm6");
|
|
asm volatile("pand %mm0,%mm5");
|
|
asm volatile("pand %mm0,%mm7");
|
|
asm volatile("pxor %mm5,%mm4");
|
|
asm volatile("pxor %mm7,%mm6");
|
|
asm volatile("movq %0,%%mm5" : : "m" (dptr[z][d]));
|
|
asm volatile("movq %0,%%mm7" : : "m" (dptr[z][d+8]));
|
|
asm volatile("pxor %mm5,%mm2");
|
|
asm volatile("pxor %mm7,%mm3");
|
|
asm volatile("pxor %mm5,%mm4");
|
|
asm volatile("pxor %mm7,%mm6");
|
|
asm volatile("pxor %mm5,%mm5");
|
|
asm volatile("pxor %mm7,%mm7");
|
|
}
|
|
asm volatile("movq %%mm2,%0" : "=m" (p[d]));
|
|
asm volatile("movq %%mm3,%0" : "=m" (p[d+8]));
|
|
asm volatile("movq %%mm4,%0" : "=m" (q[d]));
|
|
asm volatile("movq %%mm6,%0" : "=m" (q[d+8]));
|
|
}
|
|
|
|
raid6_after_mmx(&sa);
|
|
}
|
|
|
|
const struct raid6_calls raid6_mmxx2 = {
|
|
raid6_mmx2_gen_syndrome,
|
|
raid6_have_mmx,
|
|
"mmxx2",
|
|
0
|
|
};
|
|
|
|
#endif
|