1 /* $NetBSD: bootyy.c,v 1.5 2009/01/12 07:00:59 tsutsui Exp $ */
2
3 /*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Paul Kranenburg.
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 /*
33 * This is a generic "first-stage" boot program.
34 *
35 * Note that this program has absolutely no filesystem knowledge!
36 *
37 * Instead, this uses a table of disk block numbers that are
38 * filled in by the installboot program such that this program
39 * can load the "second-stage" boot program.
40 */
41
42 #include <sys/param.h>
43 #include <sys/time.h>
44 #include <sys/exec.h>
45 #include <machine/mon.h>
46
47 #include <stand.h>
48 #include "libsa.h"
49
50 int copyboot(struct open_file *, char *);
51
52 /* This determines the largest boot program we can load. */
53 #define MAXBLOCKNUM 64
54
55 /*
56 * The block size used in the Sun Network Disk protocol.
57 */
58 #define SUNND_BSIZE (512)
59
60 /*
61 * The first block number we request. This is related to historical
62 * values; in 4.2BSD, the disklabel and the first stage boot program
63 * are together called the bootblocks, and take up the first BBSIZE
64 * bytes of the disk. In 4.2BSD, BBSIZE was 8192 and the disk device
65 * block size was 512 bytes (see the definition of SUNND_BSIZE below),
66 * making the number of blocks taken up by the bootblocks (BBSIZE /
67 * SUNND_BSIZE). This value for FIRSTBLOCKNUM assumes that the
68 * second-stage boot begins immediately after the bootblocks. The
69 * second-stage boot always runs contiguously for MAXBLOCKNUM blocks.
70 * FIRSTBLOCKNUM can be increased, and MAXBLOCKNUM can be adjusted, as
71 * long as they match up with however you're putting together the disk
72 * image that is being served to this client.
73 */
74 #define FIRSTBLOCKNUM (8192 / SUNND_BSIZE)
75
76 int block_size = SUNND_BSIZE; /* default */
77
78 int
main(void)79 main(void)
80 {
81 struct open_file f;
82 void *entry;
83 char *addr;
84 int error;
85
86 #ifdef DEBUG
87 printf("bootyy: open...\n");
88 #endif
89 f.f_flags = F_RAW;
90 if (devopen(&f, 0, &addr)) {
91 printf("bootyy: devopen failed\n");
92 return 1;
93 }
94
95 addr = (char *)KERN_LOADADDR;
96 error = copyboot(&f, addr);
97 f.f_dev->dv_close(&f);
98 if (!error) {
99 #ifdef DEBUG
100 printf("bootyy: start 0x%x\n", (long)addr);
101 #endif
102 entry = addr;
103 chain_to(entry);
104 }
105 /* copyboot had a problem... */
106 return 0;
107 }
108
109 int
copyboot(struct open_file * fp,char * addr)110 copyboot(struct open_file *fp, char *addr)
111 {
112 size_t n;
113 int i, blknum;
114 char *buf;
115
116 /* Need to use a buffer that can be mapped into DVMA space. */
117 buf = alloc(block_size);
118 if (!buf)
119 panic("bootyy: alloc failed");
120
121 for (i = 0, blknum = FIRSTBLOCKNUM; i < MAXBLOCKNUM; i++, blknum++) {
122
123 #ifdef DEBUG
124 printf("bootyy: block # %d = %d\n", i, blknum);
125 #endif
126 if ((fp->f_dev->dv_strategy)(fp->f_devdata, F_READ,
127 blknum, block_size, buf, &n))
128 {
129 printf("bootyy: read failed\n");
130 return -1;
131 }
132 if (n != block_size) {
133 printf("bootyy: short read\n");
134 return -1;
135 }
136 memcpy(addr, buf, block_size);
137 addr += block_size;
138 }
139
140 return 0;
141 }
142