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/* $NetBSD: boot.c,v 1.6 1994/10/27 04:21:49 cgd Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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.
*/
#ifdef lint
char copyright[] =
"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifdef lint
#ifdef notdef
static char sccsid[] = "@(#)boot.c 7.3 (Berkeley) 5/4/91";
#endif
static char rcsid[] = "$NetBSD: boot.c,v 1.6 1994/10/27 04:21:49 cgd Exp $";
#endif /* not lint */
#include "param.h"
#include "reboot.h"
#include <a.out.h>
#include "saio.h"
#include "disklabel.h"
#include "dinode.h"
/*
* Boot program, loaded by boot block from remaing 7.5K of boot area.
* Sifts through disklabel and attempts to load an program image of
* a standalone program off the disk. If keyboard is hit during load,
* or if an error is encounter, try alternate files.
*/
char *files[] = { "bsd", "obsd", "bsd.old",
"vmunix", "ovmunix", "vmunix.old",
"boot", 0};
int retry = 0;
extern struct disklabel disklabel;
extern int bootdev, cyloffset;
static unsigned char *biosparams = (char *) 0x9ff00; /* XXX */
/*
* Boot program... loads /boot out of filesystem indicated by arguements.
* We assume an autoboot unless we detect a misconfiguration.
*/
main(dev, unit, off)
{
register struct disklabel *lp;
register int io;
register char **bootfile = files;
int howto = 0;
extern int scsisn; /* XXX */
/* are we a disk, if so look at disklabel and do things */
lp = &disklabel;
if (lp->d_type == DTYPE_SCSI) /* XXX */
off = htonl(scsisn); /* XXX */
/*printf("cyl %x %x hd %x sect %x ", biosparams[0], biosparams[1], biosparams[2], biosparams[0xe]);
printf("dev %x unit %x off %d\n", dev, unit, off);*/
if (lp->d_magic == DISKMAGIC) {
/*
* Synthesize bootdev from dev, unit, type and partition
* information from the block 0 bootstrap.
* It's dirty work, but someone's got to do it.
* This will be used by the filesystem primatives, and
* drivers. Ultimately, opendev will be created corresponding
* to which drive to pass to top level bootstrap.
*/
for (io = 0; io < lp->d_npartitions; io++) {
int sn;
if (lp->d_partitions[io].p_size == 0)
continue;
if (lp->d_type == DTYPE_SCSI)
sn = off;
else
sn = off * lp->d_secpercyl;
if (lp->d_partitions[io].p_offset == sn)
break;
}
if (io == lp->d_npartitions) goto screwed;
cyloffset = off;
} else {
screwed:
/* probably a bad or non-existant disklabel */
io = 0 ;
howto |= RB_SINGLE|RB_ASKNAME ;
}
/* construct bootdev */
/* currently, PC has no way of booting off alternate controllers */
bootdev = MAKEBOOTDEV(/*i_dev*/ dev, /*i_adapt*/0, /*i_ctlr*/0,
unit, /*i_part*/io);
for (;;) {
/*printf("namei %s", *bootfile);*/
io = namei(*bootfile);
if (io > 2) {
copyunix(io, howto, off);
} else
printf("File not found");
printf(" - didn't load %s, ",*bootfile);
if(*++bootfile == 0) bootfile = files;
printf("will try %s\n", *bootfile);
wait(1<<((retry++) + 10));
}
}
/*ARGSUSED*/
copyunix(io, howto, cyloff)
register io;
{
struct exec x;
int i;
char *addr,c;
struct dinode fil;
int off;
fetchi(io, &fil);
/*printf("mode %o ", fil.di_mode);*/
i = iread(&fil, 0, (char *)&x, sizeof x);
off = sizeof x;
if (i != sizeof x || x.a_magic != 0413) {
printf("Not an executable format");
return;
}
if (roundup(x.a_text, 4096) + x.a_data + x.a_bss > (unsigned)&fil) {
printf("File too big to load");
return;
}
off = 4096;
if (iread(&fil, off, (char *)0, x.a_text) != x.a_text)
goto shread;
off += x.a_text;
addr = (char *)x.a_text;
while ((int)addr & CLOFSET)
*addr++ = 0;
if (iread(&fil, off, addr, x.a_data) != x.a_data)
goto shread;
addr += x.a_data;
if (addr + x.a_bss > (unsigned) &fil) {
printf("Warning: bss overlaps bootstrap");
x.a_bss = (unsigned)addr - (unsigned)&fil;
}
bzero(addr, x.a_bss);
/* mask high order bits corresponding to relocated system base */
x.a_entry &= ~0xfff00000;
/*if (scankbd()) {
printf("Operator abort");
kbdreset();
return;
}*/
/* howto, bootdev, cyl */
/*printf("entry %x [%x] ", x.a_entry, *(int *) x.a_entry);*/
bcopy(0x9ff00, 0x300, 0x20); /* XXX */
i = (*((int (*)()) x.a_entry))(howto, bootdev, off);
if (i) printf("Program exits with %d", i) ;
return;
shread:
printf("Read of file is incomplete");
return;
}
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