// 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;}
// 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;
}