minix/usr.sbin/installboot/arch/amiga.c

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2012-01-10 09:46:52 +01:00
/* $NetBSD: amiga.c,v 1.7 2010/01/14 16:27:49 tsutsui Exp $ */
/*-
* Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Michael Hitch.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn of Wasabi Systems.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if !defined(__lint)
__RCSID("$NetBSD: amiga.c,v 1.7 2010/01/14 16:27:49 tsutsui Exp $");
#endif /* !__lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <assert.h>
#include <err.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "installboot.h"
/* XXX Must be kept in sync with bbstart.s! */
#define CMDLN_LOC 0x10
#define CMDLN_LEN 0x20
#define CHKSUMOFFS 1
u_int32_t chksum(u_int32_t *, int);
static int amiga_setboot(ib_params *);
struct ib_mach ib_mach_amiga =
{ "amiga", amiga_setboot, no_clearboot, no_editboot,
IB_STAGE1START | IB_STAGE2START | IB_COMMAND };
static int
amiga_setboot(ib_params *params)
{
int retval;
ssize_t rv;
char *dline;
int sumlen;
u_int32_t sum2, sum16;
struct stat bootstrapsb;
u_int32_t block[128*16];
retval = 0;
if (fstat(params->s1fd, &bootstrapsb) == -1) {
warn("Examining `%s'", params->stage1);
goto done;
}
if (!S_ISREG(bootstrapsb.st_mode)) {
warnx("`%s' must be a regular file", params->stage1);
goto done;
}
rv = pread(params->s1fd, &block, sizeof(block), 0);
if (rv == -1) {
warn("Reading `%s'", params->stage1);
goto done;
} else if (rv != sizeof(block)) {
warnx("Reading `%s': short read", params->stage1);
goto done;
}
/* XXX the choices should not be hardcoded */
sum2 = chksum(block, 1024/4);
sum16 = chksum(block, 8192/4);
if (sum16 == 0xffffffff) {
sumlen = 8192/4;
} else if (sum2 == 0xffffffff) {
sumlen = 1024/4;
} else {
errx(1, "%s: wrong checksum", params->stage1);
/* NOTREACHED */
}
if (sum2 == sum16) {
warnx("eek - both sums are the same");
}
if (params->flags & IB_COMMAND) {
dline = (char *)&(block[CMDLN_LOC/4]);
/* XXX keep the default default line in sync with bbstart.s */
if (strcmp(dline, "netbsd -ASn2") != 0) {
errx(1, "Old bootblock version? Can't change command line.");
}
(void)strncpy(dline, params->command, CMDLN_LEN-1);
block[1] = 0;
block[1] = 0xffffffff - chksum(block, sumlen);
}
if (params->flags & IB_NOWRITE) {
retval = 1;
goto done;
}
if (params->flags & IB_VERBOSE)
printf("Writing boot block\n");
rv = pwrite(params->fsfd, &block, sizeof(block), 0);
if (rv == -1) {
warn("Writing `%s'", params->filesystem);
goto done;
} else if (rv != sizeof(block)) {
warnx("Writing `%s': short write", params->filesystem);
goto done;
} else {
retval = 1;
}
done:
return (retval);
}
u_int32_t
chksum(block, size)
u_int32_t *block;
int size;
{
u_int32_t sum, lastsum;
int i;
sum = 0;
for (i=0; i<size; i++) {
lastsum = sum;
sum += htobe32(block[i]);
if (sum < lastsum)
++sum;
}
return sum;
}