From f5e70d0fe3ea990cfb3fc8d7f76a719adcb1e0b5 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw2@tylersburg.infradead.org>
Date: Mon, 13 Jul 2009 11:35:12 +0100
Subject: md: Factor out RAID6 algorithms into lib/

We'll want to use these in btrfs too.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---
 drivers/md/mktables.c | 132 --------------------------------------------------
 1 file changed, 132 deletions(-)
 delete mode 100644 drivers/md/mktables.c

(limited to 'drivers/md/mktables.c')

diff --git a/drivers/md/mktables.c b/drivers/md/mktables.c
deleted file mode 100644
index 3b15008..0000000
--- 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;
-}
-- 
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