2c681fc102
The files in this directory are modified version of "biosboot". The only difference is in that they perform their I/O via a serial port, so their preferrable usage is to form bootblocks for systems where the kernel happens to have an "options COMCONSOLE". Most of the code is actually shared with "biosboot", and make will not (and should not) descend into this directory by default. It is in the responsibility of the user to build these bootblocks instead of the original ones.
285 lines
8.0 KiB
C
285 lines
8.0 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 1.22 1994/11/07 11:26:26 davidg 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 void init_serial(void);
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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, ret;
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char *t;
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init_serial();
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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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printf("Usage: [[[%s(0,a)]%s][-s][-r][-a][-c][-d][-b]]\nUse ? for file list.\n\n"
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, devs[(drive & 0x80) ? 0 : 2]
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, names[0]);
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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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printf("Boot: ");
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getbootdev(&loadflags);
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ret = openrd();
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if (ret != 0) {
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if (ret > 0)
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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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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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} else
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printf("\n");
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}
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