1 /* $NetBSD: boot1.c,v 1.9 2005/12/11 12:17:48 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __RCSID("$NetBSD: boot1.c,v 1.9 2005/12/11 12:17:48 christos Exp $"); 41 42 #include <lib/libsa/stand.h> 43 #include <lib/libkern/libkern.h> 44 #include <biosdisk_ll.h> 45 46 #include <sys/param.h> 47 #include <sys/bootblock.h> 48 #include <sys/disklabel.h> 49 #include <dev/raidframe/raidframevar.h> /* For RF_PROTECTED_SECTORS */ 50 51 #define XSTR(x) #x 52 #define STR(x) XSTR(x) 53 54 static uint32_t bios_sector; 55 56 static struct biosdisk_ll d; 57 58 const char *boot1(uint32_t, uint32_t *); 59 extern void putstr(const char *); 60 61 extern struct disklabel ptn_disklabel; 62 63 const char * 64 boot1(uint32_t biosdev, uint32_t *sector) 65 { 66 struct stat sb; 67 int fd; 68 69 bios_sector = *sector; 70 d.dev = biosdev; 71 72 putstr("\r\nNetBSD/" MACHINE " " STR(FS) " Primary Bootstrap\r\n"); 73 74 if (set_geometry(&d, NULL)) 75 return "set_geometry\r\n"; 76 77 do { 78 /* 79 * We default to the filesystem at the start of the 80 * MBR partition 81 */ 82 fd = open("boot", 0); 83 if (fd != -1) 84 break; 85 /* 86 * Maybe the filesystem is enclosed in a raid set. 87 * add in size of raidframe header and try again. 88 * (Maybe this should only be done if the filesystem 89 * magic number is absent.) 90 */ 91 bios_sector += RF_PROTECTED_SECTORS; 92 fd = open("boot", 0); 93 if (fd != -1) 94 break; 95 96 /* 97 * Nothing at the start of the MBR partition, fallback on 98 * partition 'a' from the disklabel in this MBR partition. 99 */ 100 if (ptn_disklabel.d_magic != DISKMAGIC) 101 break; 102 if (ptn_disklabel.d_magic2 != DISKMAGIC) 103 break; 104 if (ptn_disklabel.d_partitions[0].p_fstype == FS_UNUSED) 105 break; 106 bios_sector = ptn_disklabel.d_partitions[0].p_offset; 107 *sector = bios_sector; 108 if (ptn_disklabel.d_partitions[0].p_fstype == FS_RAID) 109 bios_sector += RF_PROTECTED_SECTORS; 110 fd = open("boot", 0); 111 } while (0); 112 113 if (fd == -1 || fstat(fd, &sb) == -1) 114 return "Can't open /boot.\r\n"; 115 116 #if 0 117 if (sb.st_size > SECONDARY_MAX_LOAD) 118 return "/boot too large.\r\n"; 119 #endif 120 121 if (read(fd, (void *)SECONDARY_LOAD_ADDRESS, sb.st_size) != sb.st_size) 122 return "/boot load failed.\r\n"; 123 124 if (*(uint32_t *)(SECONDARY_LOAD_ADDRESS + 4) != X86_BOOT_MAGIC_2) 125 return "Invalid /boot file format.\r\n"; 126 127 /* We need to jump to the secondary bootstrap in realmode */ 128 return 0; 129 } 130 131 int 132 blkdevstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize) 133 { 134 if (flag != F_READ) 135 return EROFS; 136 137 if (size & (BIOSDISK_DEFAULT_SECSIZE - 1)) 138 return EINVAL; 139 140 if (rsize) 141 *rsize = size; 142 143 if (size != 0 && readsects(&d, bios_sector + dblk, 144 size / BIOSDISK_DEFAULT_SECSIZE, 145 buf, 1) != 0) 146 return EIO; 147 148 return 0; 149 } 150