Home | History | Annotate | Line # | Download | only in bootxx
      1 /*	$NetBSD: boot1.c,v 1.19 2010/01/01 03:18:27 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by David Laight.
      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 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: boot1.c,v 1.19 2010/01/01 03:18:27 christos Exp $");
     34 
     35 #include <lib/libsa/stand.h>
     36 #include <lib/libkern/libkern.h>
     37 #include <biosdisk_ll.h>
     38 
     39 #include <sys/param.h>
     40 #include <sys/bootblock.h>
     41 #include <sys/disklabel.h>
     42 #include <dev/raidframe/raidframevar.h>	/* For RF_PROTECTED_SECTORS */
     43 
     44 #define XSTR(x) #x
     45 #define STR(x) XSTR(x)
     46 
     47 static daddr_t bios_sector;
     48 
     49 static struct biosdisk_ll d;
     50 
     51 const char *boot1(uint32_t, uint64_t *);
     52 extern void putstr(const char *);
     53 
     54 extern struct disklabel ptn_disklabel;
     55 
     56 static int
     57 ob(void)
     58 {
     59 	return open("boot", 0);
     60 }
     61 
     62 const char *
     63 boot1(uint32_t biosdev, uint64_t *sector)
     64 {
     65 	struct stat sb;
     66 	int fd;
     67 
     68 	bios_sector = *sector;
     69 	d.dev = biosdev;
     70 
     71 	putstr("\r\nNetBSD/x86 " STR(FS) " Primary Bootstrap\r\n");
     72 
     73 	if (set_geometry(&d, NULL))
     74 		return "set_geometry\r\n";
     75 
     76 	/*
     77 	 * We default to the filesystem at the start of the
     78 	 * MBR partition
     79 	 */
     80 	fd = ob();
     81 	if (fd != -1)
     82 		goto done;
     83 	/*
     84 	 * Maybe the filesystem is enclosed in a raid set.
     85 	 * add in size of raidframe header and try again.
     86 	 * (Maybe this should only be done if the filesystem
     87 	 * magic number is absent.)
     88 	 */
     89 	bios_sector += RF_PROTECTED_SECTORS;
     90 	fd = ob();
     91 	if (fd != -1)
     92 		goto done;
     93 	/*
     94 	 * Nothing at the start of the MBR partition, fallback on
     95 	 * partition 'a' from the disklabel in this MBR partition.
     96 	 */
     97 	if (ptn_disklabel.d_magic != DISKMAGIC ||
     98 	    ptn_disklabel.d_magic2 != DISKMAGIC ||
     99 	    ptn_disklabel.d_partitions[0].p_fstype == FS_UNUSED)
    100 		goto done;
    101 	bios_sector = ptn_disklabel.d_partitions[0].p_offset;
    102 	*sector = bios_sector;
    103 	if (ptn_disklabel.d_partitions[0].p_fstype == FS_RAID)
    104 		bios_sector += RF_PROTECTED_SECTORS;
    105 
    106 	fd = ob();
    107 
    108 done:
    109 	/* if we fail here, so will fstat, so keep going */
    110 	if (fd == -1 || fstat(fd, &sb) == -1)
    111 		return "Can't open /boot\r\n";
    112 
    113 	biosdev = (uint32_t)sb.st_size;
    114 #if 0
    115 	if (biosdev > SECONDARY_MAX_LOAD)
    116 		return "/boot too large\r\n";
    117 #endif
    118 
    119 	if (read(fd, (void *)SECONDARY_LOAD_ADDRESS, biosdev) != biosdev)
    120 		return "/boot load failed\r\n";
    121 
    122 	if (*(uint32_t *)(SECONDARY_LOAD_ADDRESS + 4) != X86_BOOT_MAGIC_2)
    123 		return "Invalid /boot file format\r\n";
    124 
    125 	/* We need to jump to the secondary bootstrap in realmode */
    126 	return 0;
    127 }
    128 
    129 int
    130 blkdevstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize)
    131 {
    132 	if (flag != F_READ)
    133 		return EROFS;
    134 
    135 	if (size & (BIOSDISK_DEFAULT_SECSIZE - 1))
    136 		return EINVAL;
    137 
    138 	if (rsize)
    139 		*rsize = size;
    140 
    141 	if (size != 0 && readsects(&d, bios_sector + dblk,
    142 				   size / BIOSDISK_DEFAULT_SECSIZE,
    143 				   buf, 1) != 0)
    144 		return EIO;
    145 
    146 	return 0;
    147 }
    148