289 lines
8.1 KiB
C
289 lines
8.1 KiB
C
/*
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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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* from: Mach, [92/04/03 16:51:14 rvb]
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* $Id: boot.c,v 1.19 1994/10/26 20:22:10 jkh Exp $
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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 "boot.h"
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#include <a.out.h>
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#include <sys/reboot.h>
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#include <machine/bootinfo.h>
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struct exec head;
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struct bootinfo_t bootinfo;
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char *name;
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char *names[] = {
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"/kernel"
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};
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#define NUMNAMES (sizeof(names)/sizeof(char *))
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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>> FreeBSD BOOT @ 0x%x: %d/%d k of memory\n",
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ouraddr,
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memsize(0),
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memsize(1));
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printf("use hd(1,a)/kernel to boot sd0 when wd0 is also installed\n");
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gateA20();
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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 = unit = 0;
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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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/* if (inode.i_mode&IEXEC)
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loadflags |= RB_KDB;
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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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long int bootdev;
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long int total;
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int i;
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unsigned char tmpbuf[4096]; /* we need to load the first 4k here */
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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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/*if(poff==0)
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poff = 32;*/
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startaddr = (int)head.a_entry & 0x00FFFFFF; /* some MEG boundary */
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addr = startaddr;
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printf("Booting %s(%d,%c)%s @ 0x%x\n"
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, devs[maj]
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, unit
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, 'a'+part
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, name
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, addr);
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if(addr < ouraddr)
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{
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if((addr + head.a_text + head.a_data) > ouraddr)
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{
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printf("kernel overlaps loader\n");
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return;
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}
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if((addr + head.a_text + head.a_data + head.a_bss) > 0xa0000)
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{
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printf("bss exceeds 640k limit\n");
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return;
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}
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}
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printf("text=0x%x ", head.a_text);
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/********************************************************/
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/* LOAD THE TEXT SEGMENT */
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/* don't clobber the first 4k yet (BIOS NEEDS IT) */
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/********************************************************/
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read(tmpbuf,4096);
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addr += 4096;
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xread(addr, head.a_text - 4096);
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addr += head.a_text - 4096;
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/********************************************************/
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/* Load the Initialised data after the text */
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/********************************************************/
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while (addr & CLOFSET)
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*(char *)addr++ = 0;
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printf("data=0x%x ", head.a_data);
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xread(addr, head.a_data);
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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("bss=0x%x ", head.a_bss);
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if( (addr < ouraddr) && ((addr + head.a_bss) > ouraddr))
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{
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pbzero(addr,ouraddr - (int)addr);
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}
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else
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{
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pbzero(addr,head.a_bss);
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}
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addr += head.a_bss;
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#ifdef LOADSYMS /* not yet, haven't worked this out yet */
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if (addr > 0x100000)
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{
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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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/********************************************************/
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/* READ in the symbol table */
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/********************************************************/
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printf("symbols=[+0x%x", head.a_syms);
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xread(addr, head.a_syms);
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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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i -= sizeof(int);
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addr += sizeof(int);
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/********************************************************/
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/* and that many bytes of (debug symbols?) */
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/********************************************************/
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printf("+0x%x] ", i);
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xread(addr, i);
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addr += i;
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}
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#endif LOADSYMS
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/********************************************************/
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/* and note the end address of all this */
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/********************************************************/
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total = ((addr+sizeof(int)-1))&~(sizeof(int)-1);
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printf("total=0x%x ", total);
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bootdev = (MAKEBOOTDEV(maj, 0, 0, unit, part)) ;
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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=0x%x\n" ,(int)startaddr);
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/* Under no circumstances overwrite precious BIOS variables! */
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pcpy(tmpbuf, startaddr, 0x400);
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pcpy(tmpbuf + 0x500, startaddr + 0x500, 4096 - 0x500);
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bootinfo.version=1;
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bootinfo.kernelname=(char *)((int)name + (BOOTSEG<<4));
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bootinfo.nfs_diskless=0;
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startprog((int)startaddr, howto, bootdev, (int)&bootinfo+(BOOTSEG<<4));
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return;
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}
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#define NAMEBUF_LEN 100
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char namebuf[NAMEBUF_LEN];
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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][-s][-r][-a][-c][-d][-b]] :- "
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, devs[maj]
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, unit
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, 'a'+part
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, name);
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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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switch (c) {
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case 'r':
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*howto |= RB_DFLTROOT; continue;
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case 'a':
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*howto |= RB_ASKNAME; continue;
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case 'c':
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*howto |= RB_CONFIG; continue;
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case 's':
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*howto |= RB_SINGLE; continue;
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case 'd':
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*howto |= RB_KDB; continue;
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case 'b':
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*howto |= RB_HALT; continue;
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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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if (name[0] != '/') {
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int i;
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/* This is incredibly gross, but nonetheless compact */
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/* which is a good thing for a boot block to be */
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for (i = NAMEBUF_LEN - 1; i; i--)
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name[i] = name[i - 1];
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name[0] = '/';
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}
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} else
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printf("\n");
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}
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