[people/ms/u-boot.git] / fs / zfs / zfs_fletcher.c

/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <common.h>
#include <malloc.h>
#include <linux/stat.h>
#include <linux/time.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include "zfs_common.h"

#include <zfs/zfs.h>
#include <zfs/zio.h>
#include <zfs/dnode.h>
#include <zfs/uberblock_impl.h>
#include <zfs/vdev_impl.h>
#include <zfs/zio_checksum.h>
#include <zfs/zap_impl.h>
#include <zfs/zap_leaf.h>
#include <zfs/zfs_znode.h>
#include <zfs/dmu.h>
#include <zfs/dmu_objset.h>
#include <zfs/dsl_dir.h>
#include <zfs/dsl_dataset.h>

void
fletcher_2_endian(const void *buf, uint64_t size,
				  zfs_endian_t endian,
				  zio_cksum_t *zcp)
{
	const uint64_t *ip = buf;
	const uint64_t *ipend = ip + (size / sizeof(uint64_t));
	uint64_t a0, b0, a1, b1;

	for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
		a0 += zfs_to_cpu64(ip[0], endian);
		a1 += zfs_to_cpu64(ip[1], endian);
		b0 += a0;
		b1 += a1;
	}

	zcp->zc_word[0] = cpu_to_zfs64(a0, endian);
	zcp->zc_word[1] = cpu_to_zfs64(a1, endian);
	zcp->zc_word[2] = cpu_to_zfs64(b0, endian);
	zcp->zc_word[3] = cpu_to_zfs64(b1, endian);
}

void
fletcher_4_endian(const void *buf, uint64_t size, zfs_endian_t endian,
				  zio_cksum_t *zcp)
{
	const uint32_t *ip = buf;
	const uint32_t *ipend = ip + (size / sizeof(uint32_t));
	uint64_t a, b, c, d;

	for (a = b = c = d = 0; ip < ipend; ip++) {
		a += zfs_to_cpu32(ip[0], endian);
		b += a;
		c += b;
		d += c;
	}

	zcp->zc_word[0] = cpu_to_zfs64(a, endian);
	zcp->zc_word[1] = cpu_to_zfs64(b, endian);
	zcp->zc_word[2] = cpu_to_zfs64(c, endian);
	zcp->zc_word[3] = cpu_to_zfs64(d, endian);
}
Commit	Line	Data
4d3c95f5 JL	1	/*
	2	* GRUB -- GRand Unified Bootloader
	3	* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*/
	19	/*
	20	* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
	21	* Use is subject to license terms.
	22	*/
	23
	24	#include <common.h>
	25	#include <malloc.h>
	26	#include <linux/stat.h>
	27	#include <linux/time.h>
	28	#include <linux/ctype.h>
	29	#include <asm/byteorder.h>
	30	#include "zfs_common.h"
	31
	32	#include <zfs/zfs.h>
	33	#include <zfs/zio.h>
	34	#include <zfs/dnode.h>
	35	#include <zfs/uberblock_impl.h>
	36	#include <zfs/vdev_impl.h>
	37	#include <zfs/zio_checksum.h>
	38	#include <zfs/zap_impl.h>
	39	#include <zfs/zap_leaf.h>
	40	#include <zfs/zfs_znode.h>
	41	#include <zfs/dmu.h>
	42	#include <zfs/dmu_objset.h>
	43	#include <zfs/dsl_dir.h>
	44	#include <zfs/dsl_dataset.h>
	45
	46	void
	47	fletcher_2_endian(const void *buf, uint64_t size,
	48	zfs_endian_t endian,
	49	zio_cksum_t *zcp)
	50	{
	51	const uint64_t *ip = buf;
	52	const uint64_t *ipend = ip + (size / sizeof(uint64_t));
	53	uint64_t a0, b0, a1, b1;
	54
	55	for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
	56	a0 += zfs_to_cpu64(ip[0], endian);
	57	a1 += zfs_to_cpu64(ip[1], endian);
	58	b0 += a0;
	59	b1 += a1;
	60	}
	61
	62	zcp->zc_word[0] = cpu_to_zfs64(a0, endian);
	63	zcp->zc_word[1] = cpu_to_zfs64(a1, endian);
	64	zcp->zc_word[2] = cpu_to_zfs64(b0, endian);
65	zcp->zc_word[3] = cpu_to_zfs64(b1, endian);
66	}
67
68	void
69	fletcher_4_endian(const void *buf, uint64_t size, zfs_endian_t endian,
70	zio_cksum_t *zcp)
71	{
72	const uint32_t *ip = buf;
73	const uint32_t *ipend = ip + (size / sizeof(uint32_t));
74	uint64_t a, b, c, d;
75
76	for (a = b = c = d = 0; ip < ipend; ip++) {
77	a += zfs_to_cpu32(ip[0], endian);
78	b += a;
79	c += b;
80	d += c;
81	}
82
83	zcp->zc_word[0] = cpu_to_zfs64(a, endian);
84	zcp->zc_word[1] = cpu_to_zfs64(b, endian);
85	zcp->zc_word[2] = cpu_to_zfs64(c, endian);
86	zcp->zc_word[3] = cpu_to_zfs64(d, endian);
87	}