214 lines
6.2 KiB
C
214 lines
6.2 KiB
C
/* $NetBSD: boot.c,v 1.6 1994/10/27 04:21:49 cgd Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* 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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* William Jolitz.
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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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#ifdef lint
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char copyright[] =
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"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifdef lint
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#ifdef notdef
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static char sccsid[] = "@(#)boot.c 7.3 (Berkeley) 5/4/91";
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#endif
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static char rcsid[] = "$NetBSD: boot.c,v 1.6 1994/10/27 04:21:49 cgd Exp $";
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#endif /* not lint */
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#include "param.h"
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#include "reboot.h"
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#include <a.out.h>
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#include "saio.h"
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#include "disklabel.h"
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#include "dinode.h"
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/*
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* Boot program, loaded by boot block from remaing 7.5K of boot area.
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* Sifts through disklabel and attempts to load an program image of
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* a standalone program off the disk. If keyboard is hit during load,
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* or if an error is encounter, try alternate files.
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*/
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char *files[] = { "netbsd", "onetbsd", "netbsd.old",
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"386bsd", "o386bsd", "386bsd.old",
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"vmunix", "ovmunix", "vmunix.old",
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"boot", 0};
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int retry = 0;
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extern struct disklabel disklabel;
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extern int bootdev, cyloffset;
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static unsigned char *biosparams = (char *) 0x9ff00; /* XXX */
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/*
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* Boot program... loads /boot out of filesystem indicated by arguements.
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* We assume an autoboot unless we detect a misconfiguration.
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*/
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main(dev, unit, off)
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{
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register struct disklabel *lp;
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register int io;
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register char **bootfile = files;
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int howto = 0;
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extern int scsisn; /* XXX */
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/* are we a disk, if so look at disklabel and do things */
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lp = &disklabel;
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if (lp->d_type == DTYPE_SCSI) /* XXX */
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off = htonl(scsisn); /* XXX */
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/*printf("cyl %x %x hd %x sect %x ", biosparams[0], biosparams[1], biosparams[2], biosparams[0xe]);
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printf("dev %x unit %x off %d\n", dev, unit, off);*/
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if (lp->d_magic == DISKMAGIC) {
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/*
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* Synthesize bootdev from dev, unit, type and partition
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* information from the block 0 bootstrap.
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* It's dirty work, but someone's got to do it.
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* This will be used by the filesystem primatives, and
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* drivers. Ultimately, opendev will be created corresponding
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* to which drive to pass to top level bootstrap.
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*/
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for (io = 0; io < lp->d_npartitions; io++) {
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int sn;
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if (lp->d_partitions[io].p_size == 0)
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continue;
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if (lp->d_type == DTYPE_SCSI)
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sn = off;
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else
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sn = off * lp->d_secpercyl;
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if (lp->d_partitions[io].p_offset == sn)
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break;
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}
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if (io == lp->d_npartitions) goto screwed;
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cyloffset = off;
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} else {
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screwed:
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/* probably a bad or non-existant disklabel */
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io = 0 ;
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howto |= RB_SINGLE|RB_ASKNAME ;
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}
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/* construct bootdev */
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/* currently, PC has no way of booting off alternate controllers */
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bootdev = MAKEBOOTDEV(/*i_dev*/ dev, /*i_adapt*/0, /*i_ctlr*/0,
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unit, /*i_part*/io);
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for (;;) {
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/*printf("namei %s", *bootfile);*/
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io = namei(*bootfile);
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if (io > 2) {
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copyunix(io, howto, off);
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} else
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printf("File not found");
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printf(" - didn't load %s, ",*bootfile);
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if(*++bootfile == 0) bootfile = files;
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printf("will try %s\n", *bootfile);
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wait(1<<((retry++) + 10));
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}
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}
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/*ARGSUSED*/
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copyunix(io, howto, cyloff)
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register io;
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{
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struct exec x;
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int i;
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char *addr,c;
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struct dinode fil;
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int off;
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fetchi(io, &fil);
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/*printf("mode %o ", fil.di_mode);*/
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i = iread(&fil, 0, (char *)&x, sizeof x);
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off = sizeof x;
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if (i != sizeof x || x.a_magic != 0413) {
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printf("Not an executable format");
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return;
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}
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if (roundup(x.a_text, 4096) + x.a_data + x.a_bss > (unsigned)&fil) {
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printf("File too big to load");
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return;
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}
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off = 4096;
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if (iread(&fil, off, (char *)0, x.a_text) != x.a_text)
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goto shread;
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off += x.a_text;
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addr = (char *)x.a_text;
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while ((int)addr & CLOFSET)
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*addr++ = 0;
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if (iread(&fil, off, addr, x.a_data) != x.a_data)
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goto shread;
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addr += x.a_data;
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if (addr + x.a_bss > (unsigned) &fil) {
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printf("Warning: bss overlaps bootstrap");
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x.a_bss = (unsigned)addr - (unsigned)&fil;
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}
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bzero(addr, x.a_bss);
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/* mask high order bits corresponding to relocated system base */
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x.a_entry &= ~0xfff00000;
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/*if (scankbd()) {
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printf("Operator abort");
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kbdreset();
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return;
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}*/
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/* howto, bootdev, cyl */
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/*printf("entry %x [%x] ", x.a_entry, *(int *) x.a_entry);*/
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bcopy(0x9ff00, 0x300, 0x20); /* XXX */
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i = (*((int (*)()) x.a_entry))(howto, bootdev, off);
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if (i) printf("Program exits with %d", i) ;
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return;
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shread:
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printf("Read of file is incomplete");
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return;
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}
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