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, see <http://www.gnu.org/licenses/>.
17 */
18 /*
19 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
20 * Use is subject to license terms.
21 */
22
23 #pragma ident "%Z%%M% %I% %E% SMI"
24
25 #include "fsys_zfs.h"
26
27
28 void
fletcher_2_native(const void * buf,uint64_t size,zio_cksum_t * zcp)29 fletcher_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
45 void
fletcher_2_byteswap(const void * buf,uint64_t size,zio_cksum_t * zcp)46 fletcher_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
62 void
fletcher_4_native(const void * buf,uint64_t size,zio_cksum_t * zcp)63 fletcher_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
79 void
fletcher_4_byteswap(const void * buf,uint64_t size,zio_cksum_t * zcp)80 fletcher_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