4.4BSD/usr/src/sys/vax/stand/bootxx.c

/*-
 * Copyright (c) 1982, 1986 The Regents of the University of California.
 * All rights reserved.
 *
 * 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.
 *
 *	@(#)bootxx.c	7.7 (Berkeley) 5/4/91
 */

#include "sys/param.h"
#include "sys/vm.h"
#include "sys/reboot.h"
#include <a.out.h>
#include "stand/saio.h"

char bootprog[] = "boot";
extern	unsigned opendev;

/*
 * Boot program... arguments passed in r10 and r11
 * are passed through to the full boot program.
 */

main()
{
	register unsigned howto, devtype;	/* howto=r11, devtype=r10 */
	int io, unit, partition;
	register char *cp;

#ifdef lint
	howto = 0; devtype = 0; devtype = devtype;
#endif
	printf("loading %s\n", bootprog);
	io = open(bootprog, 0);
	if (io >= 0)
		copyunix(howto, opendev, io);
	_stop("boot failed\n");
}

/*ARGSUSED*/
copyunix(howto, devtype, io)
	register howto, devtype, io;	/* howto=r11, devtype=r10 */
{
	struct exec x;
	register int i;
	char *addr;

	i = read(io, (char *)&x, sizeof x);
	if (i != sizeof x || N_BADMAG(x))
		_stop("Bad format\n");
	if ((x.a_magic == ZMAGIC || x.a_magic == NMAGIC) &&
	    lseek(io, 0x400, L_SET) == -1)
		goto shread;
	if (read(io, (char *)0, x.a_text) != x.a_text)
		goto shread;
	addr = (char *)x.a_text;
	if (x.a_magic == ZMAGIC || x.a_magic == NMAGIC)
		while ((int)addr & CLOFSET)
			*addr++ = 0;
	if (read(io, addr, x.a_data) != x.a_data)
		goto shread;
	addr += x.a_data;
	x.a_bss += 128*512;	/* slop */
	for (i = 0; i < x.a_bss; i++)
		*addr++ = 0;
	x.a_entry &= 0x7fffffff;
	(*((int (*)()) x.a_entry))();
	return;
shread:
	_stop("Short read\n");
}