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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
25 
26 #include "fsys_zfs.h"
27 
28 
29 void
fletcher_2_native(const void * buf,uint64_t size,zio_cksum_t * zcp)30 fletcher_2_native(const void *buf, uint64_t size, zio_cksum_t *zcp)
31 {
32 	const uint64_t *ip = buf;
33 	const uint64_t *ipend = ip + (size / sizeof (uint64_t));
34 	uint64_t a0, b0, a1, b1;
35 
36 	for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
37 		a0 += ip[0];
38 		a1 += ip[1];
39 		b0 += a0;
40 		b1 += a1;
41 	}
42 
43 	ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
44 }
45 
46 void
fletcher_2_byteswap(const void * buf,uint64_t size,zio_cksum_t * zcp)47 fletcher_2_byteswap(const void *buf, uint64_t size, zio_cksum_t *zcp)
48 {
49 	const uint64_t *ip = buf;
50 	const uint64_t *ipend = ip + (size / sizeof (uint64_t));
51 	uint64_t a0, b0, a1, b1;
52 
53 	for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
54 		a0 += BSWAP_64(ip[0]);
55 		a1 += BSWAP_64(ip[1]);
56 		b0 += a0;
57 		b1 += a1;
58 	}
59 
60 	ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
61 }
62 
63 void
fletcher_4_native(const void * buf,uint64_t size,zio_cksum_t * zcp)64 fletcher_4_native(const void *buf, uint64_t size, 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 
80 void
fletcher_4_byteswap(const void * buf,uint64_t size,zio_cksum_t * zcp)81 fletcher_4_byteswap(const void *buf, uint64_t size, zio_cksum_t *zcp)
82 {
83 	const uint32_t *ip = buf;
84 	const uint32_t *ipend = ip + (size / sizeof (uint32_t));
85 	uint64_t a, b, c, d;
86 
87 	for (a = b = c = d = 0; ip < ipend; ip++) {
88 		a += BSWAP_32(ip[0]);
89 		b += a;
90 		c += b;
91 		d += c;
92 	}
93 
94 	ZIO_SET_CHECKSUM(zcp, a, b, c, d);
95 }
96