Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | /* -*- 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, * Boston 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__) && !defined(__arch_um__) #include <linux/raid/pq.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) { /* Not really "boot_cpu" but "all_cpus" */ return boot_cpu_has(X86_FEATURE_MMX); } /* * 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; z0 = disks - 3; /* Highest data disk */ p = dptr[z0+1]; /* XOR parity */ q = dptr[z0+2]; /* RS syndrome */ kernel_fpu_begin(); 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"); } kernel_fpu_end(); } 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; z0 = disks - 3; /* Highest data disk */ p = dptr[z0+1]; /* XOR parity */ q = dptr[z0+2]; /* RS syndrome */ kernel_fpu_begin(); 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])); } kernel_fpu_end(); } const struct raid6_calls raid6_mmxx2 = { raid6_mmx2_gen_syndrome, raid6_have_mmx, "mmxx2", 0 }; #endif |