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1.1 root 1: /*-
2: * Copyright (c) 1990 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * This code is derived from software contributed to Berkeley by
6: * William Jolitz.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: *
36: * @(#)bootxx.c 5.2 (Berkeley) 4/28/91
37: */
38:
39: #include "param.h"
40: #include <a.out.h>
41: #include "saio.h"
42: #include "reboot.h"
43: #include "disklabel.h"
44:
45: char *bootprog = "/boot";
46: extern int opendev, bootdev, cyloffset;
47: extern struct disklabel disklabel;
48:
49: /*
50: * Boot program... loads /boot out of filesystem indicated by arguements.
51: * We assume an autoboot unless we detect a misconfiguration.
52: */
53:
54: main(dev, unit, off)
55: {
56: register struct disklabel *lp;
57: register int io, partition, howto;
58:
59:
60: /* are we a disk, if so look at disklabel and do things */
61: lp = &disklabel;
62: if (lp->d_magic == DISKMAGIC) {
63: /*
64: * Synthesize bootdev from dev, unit, type and partition
65: * information from the block 0 bootstrap.
66: * It's dirty work, but someone's got to do it.
67: * This will be used by the filesystem primatives, and
68: * drivers. Ultimately, opendev will be created corresponding
69: * to which drive to pass to top level bootstrap.
70: */
71: for (io = 0; io < 8; io++)
72: #ifdef notyetSCSI
73: if (lp->d_type == DTYPE_SCSI) {
74: if (lp->d_partitions[io].p_offset == off)
75: break;
76: } else
77: #endif
78: if (lp->d_partitions[io].p_offset == off*lp->d_secpercyl)
79: break;
80:
81: if (io == 8) goto screwed;
82: cyloffset = off;
83: } else {
84: screwed:
85: /* probably a bad or non-existant disklabel */
86: io = 0 ;
87: howto |= RB_SINGLE|RB_ASKNAME ;
88: }
89:
90: /* construct bootdev */
91: /* currently, PC has no way of booting off alternate controllers */
92: bootdev = MAKEBOOTDEV(/*i_dev*/ dev, /*i_adapt*/0, /*i_ctlr*/0,
93: unit, /*i_part*/io);
94:
95: printf("loading %s\n", bootprog);
96: io = open(bootprog, 0);
97: if (io >= 0)
98: copyunix(io, howto);
99: _stop("boot failed\n");
100: }
101:
102: /*ARGSUSED*/
103: copyunix(io, howto)
104: register io;
105: {
106: struct exec x;
107: register int i;
108: char *addr;
109:
110: i = read(io, (char *)&x, sizeof x);
111: if (i != sizeof x ||
112: (x.a_magic != 0407 && x.a_magic != 0413 && x.a_magic != 0410))
113: _stop("Bad format\n");
114:
115: if ((x.a_magic == 0413 || x.a_magic == 0410) &&
116: lseek(io, 0x400, 0) == -1)
117: goto shread;
118:
119: if (read(io, (char *)0, x.a_text) != x.a_text)
120: goto shread;
121:
122: addr = (char *)x.a_text;
123: if (x.a_magic == 0413 || x.a_magic == 0410)
124: while ((int)addr & CLOFSET)
125: *addr++ = 0;
126:
127: if (read(io, addr, x.a_data) != x.a_data)
128: goto shread;
129:
130: addr += x.a_data;
131: for (i = 0; i < x.a_bss; i++)
132: *addr++ = 0;
133:
134: (*((int (*)()) x.a_entry))(howto, opendev, cyloffset);
135: return;
136: shread:
137: _stop("Short read\n");
138: }
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