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

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/* $NetBSD: landisk.c,v 1.6 2013/10/19 17:08:15 christos Exp $ */
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/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by David Laight.
*
* 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: landisk.c,v 1.6 2013/10/19 17:08:15 christos Exp $");
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#endif /* !__lint */
#include <sys/param.h>
#include <assert.h>
#include <err.h>
#include <md5.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "installboot.h"
static int landisk_setboot(ib_params *);
struct ib_mach ib_mach_landisk =
{ "landisk", landisk_setboot, no_clearboot, no_editboot,
IB_TIMEOUT };
static int
landisk_setboot(ib_params *params)
{
struct mbr_sector mbr;
struct landisk_boot_params bp, *bpp;
uint8_t *bootstrapbuf;
ssize_t rv;
uint32_t magic;
size_t bootstrapsize;
int retval, i;
uint32_t bplen;
assert(params != NULL);
assert(params->fsfd != -1);
assert(params->filesystem != NULL);
assert(params->s1fd != -1);
assert(params->stage1 != NULL);
retval = 0;
bootstrapbuf = NULL;
/*
* There is only 8k of space in a FFSv1 partition (and ustarfs)
* so ensure we don't splat over anything important.
*/
if (params->s1stat.st_size > 8192) {
warnx("stage1 bootstrap `%s' is larger than 8192 bytes",
params->stage1);
goto done;
}
/*
* Read in the existing MBR.
*/
rv = pread(params->fsfd, &mbr, sizeof(mbr), MBR_BBSECTOR);
if (rv == -1) {
warn("Reading `%s'", params->filesystem);
goto done;
} else if (rv != sizeof(mbr)) {
warnx("Reading `%s': short read", params->filesystem);
goto done;
}
if (mbr.mbr_magic != le16toh(MBR_MAGIC)) {
if (params->flags & IB_VERBOSE) {
printf(
"Ignoring MBR with invalid magic in sector 0 of `%s'\n",
params->filesystem);
}
memset(&mbr, 0, sizeof(mbr));
}
/*
* Allocate a buffer, with space to round up the input file
* to the next block size boundary, and with space for the boot
* block.
*/
bootstrapsize = roundup(params->s1stat.st_size, 512);
bootstrapbuf = malloc(bootstrapsize);
if (bootstrapbuf == NULL) {
warn("Allocating %zu bytes", bootstrapsize);
goto done;
}
memset(bootstrapbuf, 0, bootstrapsize);
/*
* Read the file into the buffer.
*/
rv = pread(params->s1fd, bootstrapbuf, params->s1stat.st_size, 0);
if (rv == -1) {
warn("Reading `%s'", params->stage1);
goto done;
} else if (rv != params->s1stat.st_size) {
warnx("Reading `%s': short read", params->stage1);
goto done;
}
magic = *(uint32_t *)(bootstrapbuf + 512 * 2 + 4);
if (magic != htole32(LANDISK_BOOT_MAGIC_1)) {
warnx("Invalid magic in stage1 boostrap %x != %x",
magic, htole32(LANDISK_BOOT_MAGIC_1));
goto done;
}
/*
* Determine size of BIOS Parameter Block (BPB) to copy from
* original MBR to the temporary buffer by examining the first
* few instruction in the new bootblock. Supported values:
* 2b a0 11 jmp ENDOF(mbr_bpbFAT32)+1, nop
* (anything else) ; don't preserve
*/
#if 0
int bpbsize;
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if (bootstrapbuf[1] == 0xa0 && bootstrapbuf[2] == 0x11 &&
(bootstrapbuf[0] == 0x2b /*|| bootstrapbuf[0] == 0x1d*/)) {
bpbsize = bootstrapbuf[0] + 2 - MBR_BPB_OFFSET;
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}
#endif
/*
* Ensure bootxx hasn't got any code or data (i.e, non-zero bytes) in
* the partition table.
*/
for (i = 0; i < (int)sizeof(mbr.mbr_parts); i++) {
if (*(uint8_t *)(bootstrapbuf + MBR_PART_OFFSET + i) != 0) {
warnx(
"Partition table has non-zero byte at offset %d in `%s'",
MBR_PART_OFFSET + i, params->stage1);
goto done;
}
}
#if 0
/*
* Copy the BPB and the partition table from the original MBR to the
* temporary buffer so that they're written back to the fs.
*/
if (bpbsize != 0) {
if (params->flags & IB_VERBOSE)
printf("Preserving %d (%#x) bytes of the BPB\n",
bpbsize, bpbsize);
(void)memcpy(bootstrapbuf + MBR_BPB_OFFSET, &mbr.mbr_bpb,
bpbsize);
}
#endif
memcpy(bootstrapbuf + MBR_PART_OFFSET, &mbr.mbr_parts,
sizeof(mbr.mbr_parts));
/*
* Fill in any user-specified options into the
* struct landisk_boot_params
* that's 8 bytes in from the start of the third sector.
* See sys/arch/landisk/stand/bootxx/bootxx.S for more information.
*/
bpp = (void *)(bootstrapbuf + 512 * 2 + 8);
bplen = le32toh(bpp->bp_length);
if (bplen > sizeof bp)
/* Ignore pad space in bootxx */
bplen = sizeof bp;
/* Take (and update) local copy so we handle size mismatches */
memset(&bp, 0, sizeof bp);
memcpy(&bp, bpp, bplen);
if (params->flags & IB_TIMEOUT)
bp.bp_timeout = htole32(params->timeout);
/* Check we aren't trying to set anything we can't save */
if (bplen < sizeof bp && memcmp((char *)&bp + bplen,
(char *)&bp + bplen + 1,
sizeof bp - bplen - 1) != 0) {
warnx("Patch area in stage1 bootstrap is too small");
goto done;
}
memcpy(bpp, &bp, bplen);
if (params->flags & IB_NOWRITE) {
retval = 1;
goto done;
}
/*
* Write MBR code to sector zero.
*/
rv = pwrite(params->fsfd, bootstrapbuf, 512, 0);
if (rv == -1) {
warn("Writing `%s'", params->filesystem);
goto done;
} else if (rv != 512) {
warnx("Writing `%s': short write", params->filesystem);
goto done;
}
/*
* Skip disklabel in sector 1 and write bootxx to sectors 2..N.
*/
rv = pwrite(params->fsfd, bootstrapbuf + 512 * 2,
bootstrapsize - 512 * 2, 512 * 2);
if (rv == -1) {
warn("Writing `%s'", params->filesystem);
goto done;
} else if ((size_t)rv != bootstrapsize - 512 * 2) {
warnx("Writing `%s': short write", params->filesystem);
goto done;
}
retval = 1;
done:
if (bootstrapbuf)
free(bootstrapbuf);
return retval;
}