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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - lib/raid6/mmx.c
1 /* -*- linux-c -*- ------------------------------------------------------- *
3 * Copyright 2002 H. Peter Anvin - All Rights Reserved
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
8 * Boston MA 02111-1307, USA; either version 2 of the License, or
9 * (at your option) any later version; incorporated herein by reference.
11 * ----------------------------------------------------------------------- */
16 * MMX implementation of RAID-6 syndrome functions
21 #include <linux/raid/pq.h>
24 /* Shared with raid6/sse1.c */
25 const struct raid6_mmx_constants
{
27 } raid6_mmx_constants
= {
28 0x1d1d1d1d1d1d1d1dULL
,
31 static int raid6_have_mmx(void)
33 /* Not really "boot_cpu" but "all_cpus" */
34 return boot_cpu_has(X86_FEATURE_MMX
);
38 * Plain MMX implementation
40 static void raid6_mmx1_gen_syndrome(int disks
, size_t bytes
, void **ptrs
)
42 u8
**dptr
= (u8
**)ptrs
;
46 z0
= disks
- 3; /* Highest data disk */
47 p
= dptr
[z0
+1]; /* XOR parity */
48 q
= dptr
[z0
+2]; /* RS syndrome */
52 asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants
.x1d
));
53 asm volatile("pxor %mm5,%mm5"); /* Zero temp */
55 for ( d
= 0 ; d
< bytes
; d
+= 8 ) {
56 asm volatile("movq %0,%%mm2" : : "m" (dptr
[z0
][d
])); /* P[0] */
57 asm volatile("movq %mm2,%mm4"); /* Q[0] */
58 for ( z
= z0
-1 ; z
>= 0 ; z
-- ) {
59 asm volatile("movq %0,%%mm6" : : "m" (dptr
[z
][d
]));
60 asm volatile("pcmpgtb %mm4,%mm5");
61 asm volatile("paddb %mm4,%mm4");
62 asm volatile("pand %mm0,%mm5");
63 asm volatile("pxor %mm5,%mm4");
64 asm volatile("pxor %mm5,%mm5");
65 asm volatile("pxor %mm6,%mm2");
66 asm volatile("pxor %mm6,%mm4");
68 asm volatile("movq %%mm2,%0" : "=m" (p
[d
]));
69 asm volatile("pxor %mm2,%mm2");
70 asm volatile("movq %%mm4,%0" : "=m" (q
[d
]));
71 asm volatile("pxor %mm4,%mm4");
77 const struct raid6_calls raid6_mmxx1
= {
78 raid6_mmx1_gen_syndrome
,
85 * Unrolled-by-2 MMX implementation
87 static void raid6_mmx2_gen_syndrome(int disks
, size_t bytes
, void **ptrs
)
89 u8
**dptr
= (u8
**)ptrs
;
93 z0
= disks
- 3; /* Highest data disk */
94 p
= dptr
[z0
+1]; /* XOR parity */
95 q
= dptr
[z0
+2]; /* RS syndrome */
99 asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants
.x1d
));
100 asm volatile("pxor %mm5,%mm5"); /* Zero temp */
101 asm volatile("pxor %mm7,%mm7"); /* Zero temp */
103 for ( d
= 0 ; d
< bytes
; d
+= 16 ) {
104 asm volatile("movq %0,%%mm2" : : "m" (dptr
[z0
][d
])); /* P[0] */
105 asm volatile("movq %0,%%mm3" : : "m" (dptr
[z0
][d
+8]));
106 asm volatile("movq %mm2,%mm4"); /* Q[0] */
107 asm volatile("movq %mm3,%mm6"); /* Q[1] */
108 for ( z
= z0
-1 ; z
>= 0 ; z
-- ) {
109 asm volatile("pcmpgtb %mm4,%mm5");
110 asm volatile("pcmpgtb %mm6,%mm7");
111 asm volatile("paddb %mm4,%mm4");
112 asm volatile("paddb %mm6,%mm6");
113 asm volatile("pand %mm0,%mm5");
114 asm volatile("pand %mm0,%mm7");
115 asm volatile("pxor %mm5,%mm4");
116 asm volatile("pxor %mm7,%mm6");
117 asm volatile("movq %0,%%mm5" : : "m" (dptr
[z
][d
]));
118 asm volatile("movq %0,%%mm7" : : "m" (dptr
[z
][d
+8]));
119 asm volatile("pxor %mm5,%mm2");
120 asm volatile("pxor %mm7,%mm3");
121 asm volatile("pxor %mm5,%mm4");
122 asm volatile("pxor %mm7,%mm6");
123 asm volatile("pxor %mm5,%mm5");
124 asm volatile("pxor %mm7,%mm7");
126 asm volatile("movq %%mm2,%0" : "=m" (p
[d
]));
127 asm volatile("movq %%mm3,%0" : "=m" (p
[d
+8]));
128 asm volatile("movq %%mm4,%0" : "=m" (q
[d
]));
129 asm volatile("movq %%mm6,%0" : "=m" (q
[d
+8]));
135 const struct raid6_calls raid6_mmxx2
= {
136 raid6_mmx2_gen_syndrome
,