/* -*- 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");
	printf("#include <linux/export.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 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("#ifdef __KERNEL__\n");
	printf("EXPORT_SYMBOL(raid6_vgfmul);\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;
}
on><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 12:38:43 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 12:38:43 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/irda/irlan/irlan_eth.c?id=0263d4ebd94b36280608e296cba39b924b6e832b'>0263d4ebd94b36280608e296cba39b924b6e832b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/irda/irlan/irlan_eth.c?id=0263d4ebd94b36280608e296cba39b924b6e832b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=0263d4ebd94b36280608e296cba39b924b6e832b'>6e21b4b3d8e8fb12cdfcfd185d46992487265a9b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/irda/irlan/irlan_eth.c?id=0263d4ebd94b36280608e296cba39b924b6e832b'>net/irda/irlan/irlan_eth.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/irda/irlan/irlan_eth.c?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>19ca2c8fecb1592d623fe5e82d6796f8d446268d</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/irda/irlan/irlan_eth.c?id=0263d4ebd94b36280608e296cba39b924b6e832b&amp;id2=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/irda/irlan/irlan_eth.c?id=7b9e1d89e1b6a3b99a8fdd949aa0f98dd5bf2f6b'>7b9e1d89e1b6a3b99a8fdd949aa0f98dd5bf2f6b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/irda/irlan/irlan_eth.c?id=0263d4ebd94b36280608e296cba39b924b6e832b&amp;id2=7b9e1d89e1b6a3b99a8fdd949aa0f98dd5bf2f6b'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'platform-drivers-x86-v4.10-4' of git://git.infradead.org/linux-platform-drivers-x86</div><div class='commit-msg'>Pull x86 platform-driver fixes from Andy Shevchenko:
 "This is my first pull request since I become a co-maintainer of
  Platform Drivers x86 subsystem. It's a bit bigger than usual due to
  material collected for almost two weeks in a row.

  MAINTAINERS:
   - Add myself to X86 PLATFORM DRIVERS as a co-maintainer

  ideapad-laptop:
   - handle ACPI event 1

  intel_mid_powerbtn:
   - Set IRQ_ONESHOT

  surface3-wmi:
   - fix uninitialized symbol
   - Shut up unused-function warning

  mlx-platform:
   - free first dev on error"

* tag 'platform-drivers-x86-v4.10-4' of git://git.infradead.org/linux-platform-drivers-x86:
  MAINTAINERS: Add myself to X86 PLATFORM DRIVERS as a co-maintainer
  platform/x86: ideapad-laptop: handle ACPI event 1
  platform/x86: intel_mid_powerbtn: Set IRQ_ONESHOT
  platform/x86: surface3-wmi: fix uninitialized symbol
  platform/x86: surface3-wmi: Shut up unused-function warning
  platform/x86: mlx-platform: free first dev on error
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=0263d4ebd94b36280608e296cba39b924b6e832b'>Diffstat</a> (limited to 'net/irda/irlan/irlan_eth.c')</div><table summary='diffstat' class='diffstat'>