311 lines
8.2 KiB
C
311 lines
8.2 KiB
C
/* $NetBSD: boot.c,v 1.28 1995/03/12 00:10:57 mycroft Exp $ */
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/*
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* Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
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*
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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/*
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Copyright 1988, 1989, 1990, 1991, 1992
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by Intel Corporation, Santa Clara, California.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appears in all
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copies and that both the copyright notice and this permission notice
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appear in supporting documentation, and that the name of Intel
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not be used in advertising or publicity pertaining to distribution
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of the software without specific, written prior permission.
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INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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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 "boot.h"
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#include <sys/reboot.h>
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struct exec head;
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int argv[9];
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#ifdef CHECKSUM
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int cflag;
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#endif
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char *name;
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char *names[] = {
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"/netbsd", "/onetbsd", "/netbsd.old",
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};
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#define NUMNAMES (sizeof(names)/sizeof(char *))
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extern char *version;
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extern int end;
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boot(drive)
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int drive;
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{
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int loadflags, currname = 0;
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char *t;
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printf("\n"
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">> NetBSD BOOT: %d/%d k [%s]\n"
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"use hd(1,a)/netbsd to boot sd0 when wd0 is also installed\n",
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argv[7] = memsize(0),
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argv[8] = memsize(1),
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version);
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gateA20(1);
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loadstart:
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/***************************************************************\
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* As a default set it to the first partition of the first *
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* floppy or hard drive *
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\***************************************************************/
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part = 0;
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unit = drive&0x7f;
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maj = (drive&0x80 ? 0 : 2); /* a good first bet */
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name = names[currname++];
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loadflags = 0;
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if (currname == NUMNAMES)
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currname = 0;
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getbootdev(&loadflags);
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if (openrd()) {
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printf("Can't find %s\n", name);
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goto loadstart;
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}
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loadprog(loadflags);
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goto loadstart;
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}
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loadprog(howto)
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int howto;
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{
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long int startaddr;
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long int addr; /* physical address.. not directly useable */
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int i;
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static int (*x_entry)() = 0;
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read(&head, sizeof(head));
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if (N_BADMAG(head)) {
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printf("invalid format\n");
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return;
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}
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poff = N_TXTOFF(head);
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startaddr = (int)head.a_entry;
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addr = (startaddr & 0x00f00000); /* some MEG boundary */
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printf("Booting %s(%d,%c)%s @ 0x%x\n",
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devs[maj], unit, 'a'+part, name, addr);
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/*
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* The +40960 is for memory used by locore.s for the kernel page
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* table and proc0 stack. XXX
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*/
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if ((addr + N_BSSADDR(head) + head.a_bss + 40960) >
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((memsize(1) + 1024) * 1024)) {
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printf("kernel too large\n");
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return;
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}
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/********************************************************/
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/* LOAD THE TEXT SEGMENT */
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/********************************************************/
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printf("%d", head.a_text);
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xread(addr, head.a_text);
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#ifdef CHECKSUM
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if (cflag)
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printf("(%x)", cksum(addr, head.a_text));
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#endif
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addr += head.a_text;
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/********************************************************/
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/* Load the Initialised data after the text */
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/********************************************************/
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if (N_GETMAGIC(head) == NMAGIC) {
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i = CLBYTES - (addr & CLOFSET);
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if (i < CLBYTES) {
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pbzero(addr, i);
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addr += i;
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}
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}
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printf("+%d", head.a_data);
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xread(addr, head.a_data);
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#ifdef CHECKSUM
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if (cflag)
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printf("(%x)", cksum(addr, head.a_data));
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#endif
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addr += head.a_data;
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/********************************************************/
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/* Skip over the uninitialised data */
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/* (but clear it) */
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/********************************************************/
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printf("+%d", head.a_bss);
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pbzero(addr, head.a_bss);
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argv[3] = (addr += head.a_bss);
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/********************************************************/
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/* copy in the symbol header */
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/********************************************************/
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pcpy(&head.a_syms, addr, sizeof(head.a_syms));
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addr += sizeof(head.a_syms);
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if (head.a_syms == 0)
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goto nosyms;
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/********************************************************/
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/* READ in the symbol table */
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/********************************************************/
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printf("+[%d", head.a_syms);
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xread(addr, head.a_syms);
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#ifdef CHECKSUM
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if (cflag)
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printf("(%x)", cksum(addr, head.a_syms));
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#endif
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addr += head.a_syms;
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/********************************************************/
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/* Followed by the next integer (another header) */
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/* more debug symbols? */
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/********************************************************/
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read(&i, sizeof(int));
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pcpy(&i, addr, sizeof(int));
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if (i) {
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i -= sizeof(int);
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addr += sizeof(int);
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printf("+%d", i);
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xread(addr, i);
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#ifdef CHECKSUM
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if (cflag)
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printf("(%x)", cksum(addr, i));
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#endif
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addr += i;
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}
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putchar(']');
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/********************************************************/
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/* and that many bytes of (debug symbols?) */
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/********************************************************/
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nosyms:
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argv[4] = ((addr+sizeof(int)-1))&~(sizeof(int)-1);
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/********************************************************/
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/* and note the end address of all this */
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/********************************************************/
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printf("=0x%x\n", addr);
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#ifdef CHECKSUM
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if (cflag)
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return;
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#endif
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/*
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* We now pass the various bootstrap parameters to the loaded
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* image via the argument list
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*
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* arg0 = 8 (magic)
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* arg1 = boot flags
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* arg2 = boot device
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* arg3 = start of symbol table (0 if not loaded)
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* arg4 = end of symbol table (0 if not loaded)
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* arg5 = transfer address from image
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* arg6 = transfer address for next image pointer
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* arg7 = conventional memory size (640)
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* arg8 = extended memory size (8196)
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*/
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if (maj == 2) {
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printf("\n\nInsert file system floppy\n");
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getc();
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}
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startaddr &= 0xffffff;
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argv[1] = howto;
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argv[2] = (MAKEBOOTDEV(maj, 0, 0, unit, part));
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argv[5] = startaddr;
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argv[6] = (int) &x_entry;
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argv[0] = 8;
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/****************************************************************/
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/* copy that first page and overwrite any BIOS variables */
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/****************************************************************/
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printf("entry point at 0x%x\n", (int)startaddr);
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startprog((int)startaddr, argv);
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}
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char namebuf[100];
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getbootdev(howto)
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int *howto;
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{
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char c, *ptr = namebuf;
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printf("Boot: [[[%s(%d,%c)]%s][-adrs]] :- ",
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devs[maj], unit, 'a'+part, name);
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#ifdef CHECKSUM
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cflag = 0;
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#endif
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if (gets(namebuf)) {
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while (c = *ptr) {
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while (c == ' ')
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c = *++ptr;
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if (!c)
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return;
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if (c == '-')
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while ((c = *++ptr) && c != ' ') {
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if (c == 'a')
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*howto |= RB_ASKNAME;
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else if (c == 'b')
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*howto |= RB_HALT;
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#ifdef CHECKSUM
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else if (c == 'c')
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cflag = 1;
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#endif
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else if (c == 'd')
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*howto |= RB_KDB;
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else if (c == 'r')
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*howto |= RB_DFLTROOT;
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else if (c == 's')
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*howto |= RB_SINGLE;
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}
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else {
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name = ptr;
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while ((c = *++ptr) && c != ' ');
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if (c)
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*ptr++ = 0;
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}
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}
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} else
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putchar('\n');
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}
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