FreeBSD/Linux Kernel Cross Reference
sys/cddl/boot/zfs/fletcher.c

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or http://www.opensolaris.org/os/licensing.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    static void
    fletcher_2_native(const void *buf, uint64_t size,
        const void *ctx_template __unused, zio_cksum_t *zcp)
    {
            const uint64_t *ip = buf;
            const uint64_t *ipend = ip + (size / sizeof (uint64_t));
            uint64_t a0, b0, a1, b1;
    
            for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
                    a0 += ip[0];
                    a1 += ip[1];
                    b0 += a0;
                    b1 += a1;
            }
    
            ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
    }
    
    static void
    fletcher_2_byteswap(const void *buf, uint64_t size,
        const void *ctx_template __unused, zio_cksum_t *zcp)
    {
            const uint64_t *ip = buf;
            const uint64_t *ipend = ip + (size / sizeof (uint64_t));
            uint64_t a0, b0, a1, b1;
    
            for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
                    a0 += BSWAP_64(ip[0]);
                    a1 += BSWAP_64(ip[1]);
                    b0 += a0;
                    b1 += a1;
            }
    
            ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
    }
    
    static void
    fletcher_4_native(const void *buf, uint64_t size,
        const void *ctx_template __unused, zio_cksum_t *zcp)
    {
            const uint32_t *ip = buf;
            const uint32_t *ipend = ip + (size / sizeof (uint32_t));
            uint64_t a, b, c, d;
    
            for (a = b = c = d = 0; ip < ipend; ip++) {
                    a += ip[0];
                    b += a;
                    c += b;
                    d += c;
            }
    
            ZIO_SET_CHECKSUM(zcp, a, b, c, d);
    }
    
    static void
    fletcher_4_byteswap(const void *buf, uint64_t size,
        const void *ctx_template __unused, zio_cksum_t *zcp)
    {
            const uint32_t *ip = buf;
            const uint32_t *ipend = ip + (size / sizeof (uint32_t));
            uint64_t a, b, c, d;
    
            for (a = b = c = d = 0; ip < ipend; ip++) {
                    a += BSWAP_32(ip[0]);
                    b += a;
                    c += b;
                    d += c;
            }
    
            ZIO_SET_CHECKSUM(zcp, a, b, c, d);
    }

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