1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/* $OpenBSD: bootxx.c,v 1.6 1996/11/27 19:54:47 niklas Exp $ */
/* $NetBSD: bootxx.c,v 1.3 1996/06/14 20:04:45 cgd Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/param.h>
#include <machine/rpb.h>
#include <machine/prom.h>
#include "bbinfo.h"
extern _end, start;
struct bbinfoloc desc = {
0xbabefacedeadbeef,
(u_int64_t)&start,
(u_int64_t)&_end,
0xdeadbeeffacebabe
};
int
open_dev(fd)
int *fd;
{
prom_return_t ret;
char devname[64];
int devlen;
/*
* XXX
* We don't know what device names look like yet,
* so we can't change them.
*/
ret.bits = prom_getenv(PROM_E_BOOTED_DEV, devname, sizeof(devname));
devlen = ret.u.retval;
ret.bits = prom_open(devname, devlen);
if (ret.u.status)
return 0;
*fd = ret.u.retval;
return 1;
}
int
load_file(bbinfop, loadaddr)
struct bbinfo *bbinfop;
char *loadaddr;
{
prom_return_t ret;
int32_t cksum, *int32p;
int i, n, fd, rv;
char *cp;
if (bbinfop->nblocks <= 0) {
puts("invalid number of blocks in boot program description\n");
return 0;
}
if (bbinfop->bsize < 4096 || bbinfop->bsize > MAXBSIZE) {
puts("invalid block size in boot program description\n");
return 0;
}
int32p = (int32_t *)&_end;
n = bbinfop->nblocks +
(sizeof(*bbinfop) / sizeof(bbinfop->blocks[0])) - 1;
if ((long)&_end - (long)&start + sizeof(bbinfop->blocks[0]) * n >
15 * 512) {
puts("way too many blocks\n");
return 0;
}
for (i = 0, cksum = 0; i < n; i++)
cksum += *int32p++;
if (cksum != 0) {
puts("invalid checksum in boot program description\n");
return 0;
}
if (!open_dev(&fd)) {
puts("couldn't open disk device\n");
return 0;
}
cp = loadaddr;
rv = 1;
for (i = 0; i < bbinfop->nblocks; i++) {
puts(".");
ret.bits = prom_read(fd, bbinfop->bsize, cp,
bbinfop->blocks[i]);
puts("\b");
if (ret.u.status) {
rv = 0;
puts("BLOCK READ ERROR!\n");
break;
}
cp += bbinfop->bsize;
}
prom_close(fd);
return (rv);
}
void
main()
{
struct bbinfo *bbinfop;
char *loadaddr;
void (*entry) __P((void));
/* Init prom callback vector. */
init_prom_calls();
puts("\nOpenBSD/Alpha Primary Boot\n");
bbinfop = (struct bbinfo *)&_end;
loadaddr = (char *)SECONDARY_LOAD_ADDRESS;
if (!load_file(bbinfop, loadaddr)) {
puts("\nLOAD FAILED!\n\n");
return;
}
puts("Jumping to entry point...\n");
entry = (void (*)())loadaddr;
(*entry)();
puts("SECONDARY BOOT BLOCK RETURNED!\n");
}
|
