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
26static void
27fletcher_2_native(const void *buf, uint64_t size,
28    const void *ctx_template __unused, zio_cksum_t *zcp)
29{
30	const uint64_t *ip = buf;
31	const uint64_t *ipend = ip + (size / sizeof (uint64_t));
32	uint64_t a0, b0, a1, b1;
33
34	for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
35		a0 += ip[0];
36		a1 += ip[1];
37		b0 += a0;
38		b1 += a1;
39	}
40
41	ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
42}
43
44static void
45fletcher_2_byteswap(const void *buf, uint64_t size,
46    const void *ctx_template __unused, 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,
64    const void *ctx_template __unused, zio_cksum_t *zcp)
65{
66	const uint32_t *ip = buf;
67	const uint32_t *ipend = ip + (size / sizeof (uint32_t));
68	uint64_t a, b, c, d;
69
70	for (a = b = c = d = 0; ip < ipend; ip++) {
71		a += ip[0];
72		b += a;
73		c += b;
74		d += c;
75	}
76
77	ZIO_SET_CHECKSUM(zcp, a, b, c, d);
78}
79
80static void
81fletcher_4_byteswap(const void *buf, uint64_t size,
82    const void *ctx_template __unused, zio_cksum_t *zcp)
83{
84	const uint32_t *ip = buf;
85	const uint32_t *ipend = ip + (size / sizeof (uint32_t));
86	uint64_t a, b, c, d;
87
88	for (a = b = c = d = 0; ip < ipend; ip++) {
89		a += BSWAP_32(ip[0]);
90		b += a;
91		c += b;
92		d += c;
93	}
94
95	ZIO_SET_CHECKSUM(zcp, a, b, c, d);
96}
97