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 28 static void 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 static void 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 static void 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 static void 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