merge in hp300 support from Utah

[unix-history] / usr / src / sys / hp300 / stand / installboot.c

/*
* Copyright (c) 1980, 1986, 1990 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*
*      @(#)installboot.c       7.1 (Berkeley) %G%
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980, 1986, 1990 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)installboot.c       7.1 (Berkeley) %G%";
#endif /* not lint */

#include "../sys/param.h"
#include "../ufs/fs.h"

char block[1024];
int maxbootsize = 16 * 7 * 512;         /* XXX */

/*
* HPs are a kludge.
* The boot program won't fit in the boot area of a file system so we
* have to place it outside the file systems.  By convention, this means
* that if the 'a' partition is being used for '/', it is offset one
* cylinder into the disk and the boot program goes into that one cylinder.
* Also by convention, the 'c' partition is defined to be the entire disk
* including this boot cylinder.  If these conventions are not adhered to,
* the potential for disaster is enormous.
*/
main(argc, argv)
       int argc;
       char *argv[];
{
       int ifd, ofd, len;
       char *dev, *standalonecode;
       int bsize = 1024;

       if (argc != 3)
               usage();
       dev = argv[2];
       len = strlen(dev);
       if (dev[len-1] != 'c')
               usage();
       standalonecode = argv[1];
       ifd = open(standalonecode, 0);
       if (ifd < 0) {
               perror(standalonecode);
               exit(1);
       }
       ofd = open(dev, 1);
       if (ofd < 0) {
               perror(dev);
               exit(1);
       }
       while ((len = read(ifd, block, bsize)) > 0) {
               if ((maxbootsize -= bsize) < 0) {
                       printf("%s: too big\n", standalonecode);
                       exit(2);
               }
               if (len < bsize)
                       bzero(&block[len], bsize-len);
               if (write(ofd, block, bsize) != bsize) {
                       perror(dev);
                       exit(2);
               }
       }
       if (len < 0) {
               perror(standalonecode);
               exit(2);
       }
       exit(0);
}

usage()
{
       printf("Usage: installboot bootprog device\n");
       printf("where:\n");
       printf("\t\"bootprog\" is a LIF format file < %d bytes long\n",
              maxbootsize);
       printf("\t\"device\" must be the 'c' partition of a bootable disk\n");
       printf("WARNING!!  If the 'c' partition contains a file system, %s\n",
              "DON'T RUN THIS!!");
       exit(1);
}