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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright 2002-2007 H. Peter Anvin - All Rights Reserved * * Make RAID-6 tables. This is a host user space program to be run at compile * time. */
#include <stdio.h>#include <string.h>#include <inttypes.h>#include <stdlib.h>#include <time.h>
static uint8_t gfmul(uint8_t a, uint8_t b){ uint8_t v = 0;
while (b) { if (b & 1) v ^= a; a = (a << 1) ^ (a & 0x80 ? 0x1d : 0); b >>= 1; }
return v;}
static uint8_t gfpow(uint8_t a, int b){ uint8_t v = 1;
b %= 255; if (b < 0) b += 255;
while (b) { if (b & 1) v = gfmul(v, a); a = gfmul(a, a); b >>= 1; }
return v;}
int main(int argc, char *argv[]){ int i, j, k; uint8_t v; uint8_t exptbl[256], invtbl[256];
printf("#include <linux/export.h>\n"); printf("#include \"algos.h\"\n");
/* Compute multiplication table */ printf("\nconst u8 __attribute__((aligned(256)))\n" "raid6_gfmul[256][256] =\n" "{\n"); for (i = 0; i < 256; i++) { printf("\t{\n"); for (j = 0; j < 256; j += 8) { printf("\t\t"); for (k = 0; k < 8; k++) printf("0x%02x,%c", gfmul(i, j + k), (k == 7) ? '\n' : ' '); } printf("\t},\n"); } printf("};\n"); printf("EXPORT_SYMBOL(raid6_gfmul);\n");
/* Compute vector multiplication table */ printf("\nconst u8 __attribute__((aligned(256)))\n" "raid6_vgfmul[256][32] =\n" "{\n"); for (i = 0; i < 256; i++) { printf("\t{\n"); for (j = 0; j < 16; j += 8) { printf("\t\t"); for (k = 0; k < 8; k++) printf("0x%02x,%c", gfmul(i, j + k), (k == 7) ? '\n' : ' '); } for (j = 0; j < 16; j += 8) { printf("\t\t"); for (k = 0; k < 8; k++) printf("0x%02x,%c", gfmul(i, (j + k) << 4), (k == 7) ? '\n' : ' '); } printf("\t},\n"); } printf("};\n"); printf("EXPORT_SYMBOL(raid6_vgfmul);\n");
/* Compute power-of-2 table (exponent) */ v = 1; printf("\nconst u8 __attribute__((aligned(256)))\n" "raid6_gfexp[256] =\n" "{\n"); for (i = 0; i < 256; i += 8) { printf("\t"); for (j = 0; j < 8; j++) { exptbl[i + j] = v; printf("0x%02x,%c", v, (j == 7) ? '\n' : ' '); v = gfmul(v, 2); if (v == 1) v = 0; /* For entry 255, not a real entry */ } } printf("};\n"); printf("EXPORT_SYMBOL(raid6_gfexp);\n");
/* Compute log-of-2 table */ printf("\nconst u8 __attribute__((aligned(256)))\n" "raid6_gflog[256] =\n" "{\n"); for (i = 0; i < 256; i += 8) { printf("\t"); for (j = 0; j < 8; j++) { v = 255; for (k = 0; k < 256; k++) if (exptbl[k] == (i + j)) { v = k; break; } printf("0x%02x,%c", v, (j == 7) ? '\n' : ' '); } } printf("};\n"); printf("EXPORT_SYMBOL(raid6_gflog);\n");
/* Compute inverse table x^-1 == x^254 */ printf("\nconst u8 __attribute__((aligned(256)))\n" "raid6_gfinv[256] =\n" "{\n"); for (i = 0; i < 256; i += 8) { printf("\t"); for (j = 0; j < 8; j++) { invtbl[i + j] = v = gfpow(i + j, 254); printf("0x%02x,%c", v, (j == 7) ? '\n' : ' '); } } printf("};\n"); printf("EXPORT_SYMBOL(raid6_gfinv);\n");
/* Compute inv(2^x + 1) (exponent-xor-inverse) table */ printf("\nconst u8 __attribute__((aligned(256)))\n" "raid6_gfexi[256] =\n" "{\n"); for (i = 0; i < 256; i += 8) { printf("\t"); for (j = 0; j < 8; j++) printf("0x%02x,%c", invtbl[exptbl[i + j] ^ 1], (j == 7) ? '\n' : ' '); } printf("};\n"); printf("EXPORT_SYMBOL(raid6_gfexi);\n");
return 0;}