text: /*	$NetBSD: boot.c,v 1.6 1995/06/28 10:22:32 jonathan Exp $	*/
  
  /*
   * Copyright (c) 1992, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Ralph Campbell.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)boot.c	8.1 (Berkeley) 6/10/93
   */
  
  #include <sys/param.h>
  #include <sys/exec.h>
  #include <stand.h>
  #include <pmax/stand/dec_prom.h>
  
  
  #include "byteswap.h"
  
  char	line[1024];
  
  /*
   * This gets arguments from the PROM, calls other routines to open
   * and load the program to boot, and then transfers execution to that
   * new program.
   * Argv[0] should be something like "rz(0,0,0)vmunix" on a DECstation 3100.
   * Argv[0,1] should be something like "boot 5/rz0/vmunix" on a DECstation 5000.
   * The argument "-a" means vmunix should do an automatic reboot.
   */
  int
  main(argc, argv)
  	int argc;
  	char **argv;
  {
  	register char *cp;
  	int ask, entry;
  
  #ifdef DIAGNOSTIC
  	extern int prom_id; /* hack, saved by standalone startup */
  
  	(*(callvec._printf))("hello, world\n");
  
  	printf ((callv == &callvec)?  "No REX %x\n" : "have REX %x\n",
  		 prom_id);
  #endif
  
  #ifdef JUSTASK
  	ask = 1;
  #else
  	/* check for DS5000 boot */
  	if (strcmp(argv[0], "boot") == 0) {
  		argc--;
  		argv++;
  	}
  	cp = *argv;
  	ask = 0;
  #endif /* JUSTASK */
  
    	printf("Boot: ");
  	if (ask) {
  		gets(line);
  		if (line[0] == '\0')
  			return 0;
  		cp = line;
  		argv[0] = cp;
  		argc = 1;
  	} else
  		printf("%s\n", cp);
  	entry = loadfile(cp);
  	if (entry == -1)
  		return 0;
  
  	printf("Starting at 0x%x\n\n", entry);
  	if (callv == &callvec)
  		((void (*)())entry)(argc, argv, 0, 0);
  	else
  		((void (*)())entry)(argc, argv, DEC_PROM_MAGIC, callv);
  }
  
  /*
   * Open 'filename', read in program and return the entry point or -1 if error.
   */
  loadfile(fname)
  	register char *fname;
  {
  	register struct devices *dp;
  	register int fd, i, n;
  	struct exec aout;
  
  	if ((fd = open(fname, 0)) < 0) {
  		printf("open(%s) failed: %d\n", fname, errno);
  		goto err;
  	}
  
  	/* read the exec header */
  	i = read(fd, (char *)&aout, sizeof(aout));
  	if (i != sizeof(aout)) {
  		printf("no aout header\n");
  		goto cerr;
  	} else if ((N_GETMAGIC(aout) != OMAGIC)
  		   && (aout.a_midmag & 0xfff) != OMAGIC) {
  		printf("%s: bad magic %x\n", fname, aout.a_midmag);
  		goto cerr;
  	}
  
  	/* read the code and initialized data */
  	printf("Size: %d+%d", aout.a_text, aout.a_data);
  #if 0
  	/* In an OMAGIC file, we're already there. */
  	if (lseek(fd, (off_t)N_TXTOFF(aout), 0) < 0) {
  		goto cerr;
  	}
  #endif
  	i = aout.a_text + aout.a_data;
  	n = read(fd, (char *)aout.a_entry, i);
  #ifndef SMALL
  	(void) close(fd);
  #endif
  	if (n < 0) {
  		printf("read error %d\n", errno);
  		goto err;
  	} else if (n != i) {
  		printf("read() short %d bytes\n", i - n);
  		goto err;
  		
  	}
  
  	/* kernel will zero out its own bss */
  	n = aout.a_bss;
  	printf("+%d\n", n);
  
  	return ((int)aout.a_entry);
  
  cerr:
  #ifndef SMALL
  	(void) close(fd);
  #endif
  err:
  	printf("Can't boot '%s'\n", fname);
  	return (-1);
  }
  