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
ob(void)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 *
boot1(uint32_t biosdev,uint64_t * sector)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
blkdevstrategy(void * devdata,int flag,daddr_t dblk,size_t size,void * buf,size_t * rsize)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 }
183