148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ralph Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)boot.c 8.1 (Berkeley) 6/10/93
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* $Id: boot.c,v 1.3 1994/05/27 09:04:50 glass Exp $
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*/
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <pmax/stand/dec_prom.h>
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char line[1024];
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/*
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* This gets arguments from the PROM, calls other routines to open
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* and load the program to boot, and then transfers execution to that
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* new program.
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* Argv[0] should be something like "rz(0,0,0)vmunix" on a DECstation 3100.
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* Argv[0,1] should be something like "boot 5/rz0/vmunix" on a DECstation 5000.
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* The argument "-a" means vmunix should do an automatic reboot.
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*/
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void
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main(argc, argv)
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int argc;
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char **argv;
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{
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register char *cp;
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int ask, entry;
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#ifdef JUSTASK
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ask = 1;
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#else
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/* check for DS5000 boot */
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if (strcmp(argv[0], "boot") == 0) {
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argc--;
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argv++;
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}
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cp = *argv;
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ask = 0;
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#endif /* JUSTASK */
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for (;;) {
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if (ask) {
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printf("Boot: ");
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gets(line);
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if (line[0] == '\0')
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continue;
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cp = line;
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argv[0] = cp;
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argc = 1;
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} else
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printf("Boot: %s\n", cp);
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entry = loadfile(cp);
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if (entry != -1)
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break;
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ask = 1;
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}
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printf("Starting at 0x%x\n\n", entry);
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if (callv == &callvec)
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((void (*)())entry)(argc, argv, 0, 0);
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else
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((void (*)())entry)(argc, argv, DEC_PROM_MAGIC, callv);
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}
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/*
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* Open 'filename', read in program and return the entry point or -1 if error.
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*/
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loadfile(fname)
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register char *fname;
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{
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register struct devices *dp;
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register int fd, i, n;
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struct exec aout;
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if ((fd = open(fname, 0)) < 0) {
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goto err;
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}
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/* read the exec header */
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i = read(fd, (char *)&aout, sizeof(aout));
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if (i != sizeof(aout)) {
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goto cerr;
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} else if (aout.a_magic != OMAGIC) {
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goto cerr;
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}
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/* read the code and initialized data */
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printf("Size: %d+%d", aout.a_text, aout.a_data);
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if (lseek(fd, (off_t)N_TXTOFF(aout), 0) < 0) {
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goto cerr;
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}
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i = aout.a_text + aout.a_data;
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n = read(fd, (char *)aout.a_entry, i);
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#ifndef SMALL
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(void) close(fd);
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#endif
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if (n < 0) {
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goto err;
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} else if (n != i) {
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goto err;
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}
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/* kernel will zero out its own bss */
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n = aout.a_bss;
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printf("+%d\n", n);
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return ((int)aout.a_entry);
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cerr:
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#ifndef SMALL
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(void) close(fd);
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#endif
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err:
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printf("Can't boot '%s'\n", fname);
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return (-1);
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}
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