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      1 /*	$NetBSD: sum.c,v 1.5 2010/01/14 16:27:49 tsutsui Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Luke Mewburn of Wasabi Systems.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Copyright (c) 1999 Ross Harvey.  All rights reserved.
     34  *
     35  * Redistribution and use in source and binary forms, with or without
     36  * modification, are permitted provided that the following conditions
     37  * are met:
     38  * 1. Redistributions of source code must retain the above copyright
     39  *    notice, this list of conditions and the following disclaimer.
     40  * 2. Redistributions in binary form must reproduce the above copyright
     41  *    notice, this list of conditions and the following disclaimer in the
     42  *    documentation and/or other materials provided with the distribution.
     43  * 3. All advertising materials mentioning features or use of this software
     44  *    must display the following acknowledgement:
     45  *      This product includes software developed by Ross Harvey
     46  *	for the NetBSD Project.
     47  * 4. The name of the author may not be used to endorse or promote products
     48  *    derived from this software without specific prior written permission
     49  *
     50  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     51  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     52  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     53  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     54  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     55  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     56  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     57  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     59  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     60  */
     61 
     62 #if HAVE_NBTOOL_CONFIG_H
     63 #include "nbtool_config.h"
     64 #endif
     65 
     66 #include <sys/cdefs.h>
     67 #if !defined(__lint)
     68 __RCSID("$NetBSD: sum.c,v 1.5 2010/01/14 16:27:49 tsutsui Exp $");
     69 #endif	/* !__lint */
     70 
     71 #include <sys/types.h>
     72 
     73 #include <assert.h>
     74 #include <stdio.h>
     75 
     76 #include "installboot.h"
     77 
     78 
     79 uint16_t
     80 compute_sunsum(const uint16_t *bb16)
     81 {
     82 	uint16_t	i, s;
     83 
     84 	assert(bb16 != NULL);
     85 
     86 	s = 0;
     87 	for (i = 0; i < 255; ++i)
     88 		s ^= bb16[i];
     89 	return (s);
     90 }
     91 
     92 int
     93 set_sunsum(ib_params *params, uint16_t *bb16, uint16_t sum)
     94 {
     95 
     96 	assert(params != NULL);
     97 	assert(bb16 != NULL);
     98 
     99 #define	SUNSUM_OFFSET	255
    100 	if (params->flags & IB_VERBOSE) {
    101 		printf("Old Sun checksum:          0x%04x\n",
    102 		    be16toh(bb16[SUNSUM_OFFSET]));
    103 		printf("Recalculated Sun checksum: 0x%04x\n", be16toh(sum));
    104 	}
    105 		// XXX: does this need to be big endian?
    106 	bb16[SUNSUM_OFFSET] = sum;
    107 	return (1);
    108 }
    109