1 /*-
2 * Copyright (c) 1986, 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 char copyright[] =
10 "@(#) Copyright (c) 1986, 1990 The Regents of the University of California.\n\
11 All rights reserved.\n";
12 #endif /* not lint */
13
14 #ifndef lint
15 static char sccsid[] = "@(#)installboot.c 7.4 (Berkeley) 10/11/92";
16 #endif /* not lint */
17
18 #include <sys/param.h>
19 #include <ufs/ffs/fs.h>
20
21 char block[1024];
22 int maxbootsize = 16 * 7 * 512; /* XXX */
23
24 /*
25 * HPs are a kludge.
26 * The boot program won't fit in the boot area of a file system so we
27 * have to place it outside the file systems. By convention, this means
28 * that if the 'a' partition is being used for '/', it is offset one
29 * cylinder into the disk and the boot program goes into that one cylinder.
30 * Also by convention, the 'c' partition is defined to be the entire disk
31 * including this boot cylinder. If these conventions are not adhered to,
32 * the potential for disaster is enormous.
33 */
main(argc,argv)34 main(argc, argv)
35 int argc;
36 char *argv[];
37 {
38 int ifd, ofd, len;
39 char *dev, *standalonecode;
40 int bsize = 1024;
41
42 if (argc != 3)
43 usage();
44 dev = argv[2];
45 len = strlen(dev);
46 if (dev[len-1] != 'c')
47 usage();
48 standalonecode = argv[1];
49 ifd = open(standalonecode, 0);
50 if (ifd < 0) {
51 perror(standalonecode);
52 exit(1);
53 }
54 ofd = open(dev, 1);
55 if (ofd < 0) {
56 perror(dev);
57 exit(1);
58 }
59 while ((len = read(ifd, block, bsize)) > 0) {
60 if ((maxbootsize -= bsize) < 0) {
61 printf("%s: too big\n", standalonecode);
62 exit(2);
63 }
64 if (len < bsize)
65 bzero(&block[len], bsize-len);
66 if (write(ofd, block, bsize) != bsize) {
67 perror(dev);
68 exit(2);
69 }
70 }
71 if (len < 0) {
72 perror(standalonecode);
73 exit(2);
74 }
75 exit(0);
76 }
77
usage()78 usage()
79 {
80 printf("Usage: installboot bootprog device\n");
81 printf("where:\n");
82 printf("\t\"bootprog\" is a LIF format file < %d bytes long\n",
83 maxbootsize);
84 printf("\t\"device\" must be the 'c' partition of a bootable disk\n");
85 printf("WARNING!! If the 'c' partition contains a file system, %s\n",
86 "DON'T RUN THIS!!");
87 exit(1);
88 }
89