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

   1 /*      $NetBSD: boot1.c,v 1.20 2011/01/06 01:08:48 jakllsch 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 1.20 2011/01/06 01:08:48 jakllsch 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 #if !defined(__minix)
  43 #include <dev/raidframe/raidframevar.h> /* For RF_PROTECTED_SECTORS */
  44 #else
  45 #define RF_PROTECTED_SECTORS 64
  46 #endif /* !defined(__minix) */
  47
  48 #define XSTR(x) #x
  49 #define STR(x) XSTR(x)
  50
  51 static daddr_t bios_sector;
  52
  53 static struct biosdisk_ll d;
  54
  55 const char *boot1(uint32_t, uint64_t *);
  56 extern void putstr(const char *);
  57
  58 extern struct disklabel ptn_disklabel;
  59
  60 static int
  61 ob(void)
  62 {
  63 #if !defined(__minix)
  64         return open("boot", 0);
  65 #else
  66         return open("boot_monitor", 0);
  67 #endif /* !defined(__minix) */
  68 }
  69
  70 const char *
  71 boot1(uint32_t biosdev, uint64_t *sector)
  72 {
  73         struct stat sb;
  74         int fd;
  75
  76         bios_sector = *sector;
  77         d.dev = biosdev;
  78
  79 #if defined(__minix)
  80         putstr("\r\nMINIX/x86 " STR(FS) " Primary Bootstrap\r\n");
  81 #else
  82         putstr("\r\nNetBSD/x86 " STR(FS) " Primary Bootstrap\r\n");
  83 #endif /* defined(__minix) */
  84
  85         if (set_geometry(&d, NULL))
  86                 return "set_geometry\r\n";
  87
  88         /*
  89          * We default to the filesystem at the start of the
  90          * MBR partition
  91          */
  92         fd = ob();
  93         if (fd != -1)
  94                 goto done;
  95         /*
  96          * Maybe the filesystem is enclosed in a raid set.
  97          * add in size of raidframe header and try again.
  98          * (Maybe this should only be done if the filesystem
  99          * magic number is absent.)
 100          */
 101         bios_sector += RF_PROTECTED_SECTORS;
 102         fd = ob();
 103         if (fd != -1)
 104                 goto done;
 105
 106 #if defined(__minix) && defined(BOOT_FROM_MINIXFS3)
 107         bios_sector -= RF_PROTECTED_SECTORS;
 108         bios_sector += MINIX3_FIRST_SUBP_OFFSET;
 109         *sector = bios_sector;
 110
 111         fd = ob();
 112         if (fd != -1)
 113                 goto done;
 114 #endif /* defined(__minix) && defined(BOOT_FROM_MINIXFS3) */
 115
 116         /*
 117          * Nothing at the start of the MBR partition, fallback on
 118          * partition 'a' from the disklabel in this MBR partition.
 119          */
 120         if (ptn_disklabel.d_magic != DISKMAGIC ||
 121             ptn_disklabel.d_magic2 != DISKMAGIC ||
 122             ptn_disklabel.d_partitions[0].p_fstype == FS_UNUSED)
 123                 goto done;
 124         bios_sector = ptn_disklabel.d_partitions[0].p_offset;
 125         *sector = bios_sector;
 126         if (ptn_disklabel.d_partitions[0].p_fstype == FS_RAID)
 127                 bios_sector += RF_PROTECTED_SECTORS;
 128
 129         fd = ob();
 130
 131 done:
 132         /* if we fail here, so will fstat, so keep going */
 133         if (fd == -1 || fstat(fd, &sb) == -1)
 134 #if !defined(__minix)
 135                 return "Can't open /boot\r\n";
 136 #else
 137                 return "Can't open /boot_monitor\r\n";
 138 #endif /* !defined(__minix) */
 139
 140         biosdev = (uint32_t)sb.st_size;
 141 #if 0
 142         if (biosdev > SECONDARY_MAX_LOAD)
 143                 return "/boot too large\r\n";
 144 #endif
 145
 146         if (read(fd, (void *)SECONDARY_LOAD_ADDRESS, biosdev) != biosdev)
 147 #if !defined(__minix)
 148                 return "/boot load failed\r\n";
 149 #else
 150                 return "/boot_monitor load failed\r\n";
 151 #endif /* !defined(__minix) */
 152
 153         if (*(uint32_t *)(SECONDARY_LOAD_ADDRESS + 4) != X86_BOOT_MAGIC_2)
 154 #if !defined(__minix)
 155                 return "Invalid /boot file format\r\n";
 156 #else
 157                 return "Invalid /boot_monitor file format\r\n";
 158 #endif /* !defined(__minix) */
 159
 160         /* We need to jump to the secondary bootstrap in realmode */
 161         return 0;
 162 }
 163
 164 int
 165 blkdevstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize)
 166 {
 167         if (flag != F_READ)
 168                 return EROFS;
 169
 170         if (size & (BIOSDISK_DEFAULT_SECSIZE - 1))
 171                 return EINVAL;
 172
 173         if (rsize)
 174                 *rsize = size;
 175
 176         if (size != 0 && readsects(&d, bios_sector + dblk,
 177                                    size / BIOSDISK_DEFAULT_SECSIZE,
 178                                    buf, 1) != 0)
 179                 return EIO;
 180
 181         return 0;
 182 }