1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*#pragma ident	"%Z%%M%	%I%	%E% SMI"*/
27
28static void
29fletcher_2_native(const void *buf, uint64_t size, zio_cksum_t *zcp)
30{
31	const uint64_t *ip = buf;
32	const uint64_t *ipend = ip + (size / sizeof (uint64_t));
33	uint64_t a0, b0, a1, b1;
34
35	for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
36		a0 += ip[0];
37		a1 += ip[1];
38		b0 += a0;
39		b1 += a1;
40	}
41
42	ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
43}
44
45static void
46fletcher_2_byteswap(const void *buf, uint64_t size, zio_cksum_t *zcp)
47{
48	const uint64_t *ip = buf;
49	const uint64_t *ipend = ip + (size / sizeof (uint64_t));
50	uint64_t a0, b0, a1, b1;
51
52	for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
53		a0 += BSWAP_64(ip[0]);
54		a1 += BSWAP_64(ip[1]);
55		b0 += a0;
56		b1 += a1;
57	}
58
59	ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
60}
61
62static void
63fletcher_4_native(const void *buf, uint64_t size, zio_cksum_t *zcp)
64{
65	const uint32_t *ip = buf;
66	const uint32_t *ipend = ip + (size / sizeof (uint32_t));
67	uint64_t a, b, c, d;
68
69	for (a = b = c = d = 0; ip < ipend; ip++) {
70		a += ip[0];
71		b += a;
72		c += b;
73		d += c;
74	}
75
76	ZIO_SET_CHECKSUM(zcp, a, b, c, d);
77}
78
79static void
80fletcher_4_byteswap(const void *buf, uint64_t size, zio_cksum_t *zcp)
81{
82	const uint32_t *ip = buf;
83	const uint32_t *ipend = ip + (size / sizeof (uint32_t));
84	uint64_t a, b, c, d;
85
86	for (a = b = c = d = 0; ip < ipend; ip++) {
87		a += BSWAP_32(ip[0]);
88		b += a;
89		c += b;
90		d += c;
91	}
92
93	ZIO_SET_CHECKSUM(zcp, a, b, c, d);
94}
95