150 lines
4.5 KiB
C
150 lines
4.5 KiB
C
/* $NetBSD: boot1.c,v 1.9 2005/12/11 12:17:48 christos Exp $ */
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/*-
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* Copyright (c) 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by David Laight.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: boot1.c,v 1.9 2005/12/11 12:17:48 christos Exp $");
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#include <lib/libsa/stand.h>
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#include <lib/libkern/libkern.h>
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#include <biosdisk_ll.h>
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#include <sys/param.h>
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#include <sys/bootblock.h>
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#include <sys/disklabel.h>
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#include <dev/raidframe/raidframevar.h> /* For RF_PROTECTED_SECTORS */
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#define XSTR(x) #x
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#define STR(x) XSTR(x)
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static uint32_t bios_sector;
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static struct biosdisk_ll d;
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const char *boot1(uint32_t, uint32_t *);
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extern void putstr(const char *);
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extern struct disklabel ptn_disklabel;
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const char *
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boot1(uint32_t biosdev, uint32_t *sector)
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{
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struct stat sb;
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int fd;
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bios_sector = *sector;
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d.dev = biosdev;
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putstr("\r\nNetBSD/" MACHINE " " STR(FS) " Primary Bootstrap\r\n");
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if (set_geometry(&d, NULL))
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return "set_geometry\r\n";
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do {
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/*
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* We default to the filesystem at the start of the
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* MBR partition
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*/
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fd = open("boot", 0);
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if (fd != -1)
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break;
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/*
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* Maybe the filesystem is enclosed in a raid set.
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* add in size of raidframe header and try again.
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* (Maybe this should only be done if the filesystem
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* magic number is absent.)
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*/
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bios_sector += RF_PROTECTED_SECTORS;
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fd = open("boot", 0);
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if (fd != -1)
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break;
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/*
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* Nothing at the start of the MBR partition, fallback on
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* partition 'a' from the disklabel in this MBR partition.
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*/
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if (ptn_disklabel.d_magic != DISKMAGIC)
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break;
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if (ptn_disklabel.d_magic2 != DISKMAGIC)
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break;
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if (ptn_disklabel.d_partitions[0].p_fstype == FS_UNUSED)
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break;
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bios_sector = ptn_disklabel.d_partitions[0].p_offset;
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*sector = bios_sector;
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if (ptn_disklabel.d_partitions[0].p_fstype == FS_RAID)
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bios_sector += RF_PROTECTED_SECTORS;
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fd = open("boot", 0);
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} while (0);
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if (fd == -1 || fstat(fd, &sb) == -1)
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return "Can't open /boot.\r\n";
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#if 0
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if (sb.st_size > SECONDARY_MAX_LOAD)
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return "/boot too large.\r\n";
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#endif
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if (read(fd, (void *)SECONDARY_LOAD_ADDRESS, sb.st_size) != sb.st_size)
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return "/boot load failed.\r\n";
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if (*(uint32_t *)(SECONDARY_LOAD_ADDRESS + 4) != X86_BOOT_MAGIC_2)
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return "Invalid /boot file format.\r\n";
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/* We need to jump to the secondary bootstrap in realmode */
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return 0;
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}
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int
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blkdevstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize)
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{
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if (flag != F_READ)
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return EROFS;
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if (size & (BIOSDISK_DEFAULT_SECSIZE - 1))
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return EINVAL;
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if (rsize)
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*rsize = size;
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if (size != 0 && readsects(&d, bios_sector + dblk,
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size / BIOSDISK_DEFAULT_SECSIZE,
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buf, 1) != 0)
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return EIO;
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return 0;
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}
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