minix/sys/arch/i386/stand/bootxx/boot1.c

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/* $NetBSD: boot1.c,v 1.20 2011/01/06 01:08:48 jakllsch Exp $ */
/*-
* 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: boot1.c,v 1.20 2011/01/06 01:08:48 jakllsch Exp $");
#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>
#include <biosdisk_ll.h>
#include <sys/param.h>
#include <sys/bootblock.h>
#include <sys/disklabel.h>
#if !defined(__minix)
#include <dev/raidframe/raidframevar.h> /* For RF_PROTECTED_SECTORS */
#else
#define RF_PROTECTED_SECTORS 64
#endif /* !defined(__minix) */
#define XSTR(x) #x
#define STR(x) XSTR(x)
static daddr_t bios_sector;
static struct biosdisk_ll d;
const char *boot1(uint32_t, uint64_t *);
extern void putstr(const char *);
extern struct disklabel ptn_disklabel;
static int
ob(void)
{
#if !defined(__minix)
return open("boot", 0);
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#else
return open("boot_monitor", 0);
#endif /* !defined(__minix) */
}
const char *
boot1(uint32_t biosdev, uint64_t *sector)
{
struct stat sb;
int fd;
bios_sector = *sector;
d.dev = biosdev;
#if defined(__minix)
putstr("\r\nMINIX/x86 " STR(FS) " Primary Bootstrap\r\n");
#else
putstr("\r\nNetBSD/x86 " STR(FS) " Primary Bootstrap\r\n");
#endif /* defined(__minix) */
if (set_geometry(&d, NULL))
return "set_geometry\r\n";
/*
* We default to the filesystem at the start of the
* MBR partition
*/
fd = ob();
if (fd != -1)
goto done;
/*
* Maybe the filesystem is enclosed in a raid set.
* add in size of raidframe header and try again.
* (Maybe this should only be done if the filesystem
* magic number is absent.)
*/
bios_sector += RF_PROTECTED_SECTORS;
fd = ob();
if (fd != -1)
goto done;
#if defined(__minix) && defined(BOOT_FROM_MINIXFS3)
bios_sector -= RF_PROTECTED_SECTORS;
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bios_sector += MINIX3_FIRST_SUBP_OFFSET;
*sector = bios_sector;
fd = ob();
if (fd != -1)
goto done;
#endif /* defined(__minix) && defined(BOOT_FROM_MINIXFS3) */
/*
* Nothing at the start of the MBR partition, fallback on
* partition 'a' from the disklabel in this MBR partition.
*/
if (ptn_disklabel.d_magic != DISKMAGIC ||
ptn_disklabel.d_magic2 != DISKMAGIC ||
ptn_disklabel.d_partitions[0].p_fstype == FS_UNUSED)
goto done;
bios_sector = ptn_disklabel.d_partitions[0].p_offset;
*sector = bios_sector;
if (ptn_disklabel.d_partitions[0].p_fstype == FS_RAID)
bios_sector += RF_PROTECTED_SECTORS;
fd = ob();
done:
/* if we fail here, so will fstat, so keep going */
if (fd == -1 || fstat(fd, &sb) == -1)
#if !defined(__minix)
return "Can't open /boot\r\n";
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#else
return "Can't open /boot_monitor\r\n";
#endif /* !defined(__minix) */
biosdev = (uint32_t)sb.st_size;
#if 0
if (biosdev > SECONDARY_MAX_LOAD)
return "/boot too large\r\n";
#endif
if (read(fd, (void *)SECONDARY_LOAD_ADDRESS, biosdev) != biosdev)
#if !defined(__minix)
return "/boot load failed\r\n";
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#else
return "/boot_monitor load failed\r\n";
#endif /* !defined(__minix) */
if (*(uint32_t *)(SECONDARY_LOAD_ADDRESS + 4) != X86_BOOT_MAGIC_2)
#if !defined(__minix)
return "Invalid /boot file format\r\n";
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#else
return "Invalid /boot_monitor file format\r\n";
#endif /* !defined(__minix) */
/* We need to jump to the secondary bootstrap in realmode */
return 0;
}
int
blkdevstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize)
{
if (flag != F_READ)
return EROFS;
if (size & (BIOSDISK_DEFAULT_SECSIZE - 1))
return EINVAL;
if (rsize)
*rsize = size;
if (size != 0 && readsects(&d, bios_sector + dblk,
size / BIOSDISK_DEFAULT_SECSIZE,
buf, 1) != 0)
return EIO;
return 0;
}