diff options
Diffstat (limited to 'drivers/md/mktables.c')
-rw-r--r-- | drivers/md/mktables.c | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/drivers/md/mktables.c b/drivers/md/mktables.c deleted file mode 100644 index 3b1500843bba..000000000000 --- a/drivers/md/mktables.c +++ /dev/null @@ -1,132 +0,0 @@ -/* -*- linux-c -*- ------------------------------------------------------- * - * - * Copyright 2002-2007 H. Peter Anvin - All Rights Reserved - * - * This file is part of the Linux kernel, and is made available under - * the terms of the GNU General Public License version 2 or (at your - * option) any later version; incorporated herein by reference. - * - * ----------------------------------------------------------------------- */ - -/* - * mktables.c - * - * 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/raid/pq.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("#ifdef __KERNEL__\n"); - printf("EXPORT_SYMBOL(raid6_gfmul);\n"); - printf("#endif\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("#ifdef __KERNEL__\n"); - printf("EXPORT_SYMBOL(raid6_gfexp);\n"); - printf("#endif\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("#ifdef __KERNEL__\n"); - printf("EXPORT_SYMBOL(raid6_gfinv);\n"); - printf("#endif\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("#ifdef __KERNEL__\n"); - printf("EXPORT_SYMBOL(raid6_gfexi);\n"); - printf("#endif\n"); - - return 0; -} |