bf709d2564
1/ Makefile: the maximum size for boot2 is 7.5K not 7K, so don't complain until it reaches THAT size.. newfs leaves 8K and boot 1 is 512k. leaving 7.5K becasue the disklabel is considered to part of the boot2 file. [512 boot1][512 disklabel][ 7K boot2 code ] [boot1 file][ boot2 file ] 2/ Boot2.S: move the soring of the default name read from block 2 to AFTER clearing the BSS. 3/ boot.c: Move the parsing of the command line into the place it's called for clarity.. alsoi comment it a bit and clean it up a bit.. for some reason this seems ot have made it a little larger, but I can't work out why.. maybe bruce might have ideas? compensated for by shrinkage elsewhere.. the practical result of this is htat the default string can now contain args e.g. if you change the default string to have -gd then the machine will boot to the dgb debugger stub by default.. this is mostly useful with the nextboot utility.. as it now allows you to remotely force a machine to reboot into the debugger.
366 lines
9.5 KiB
C
366 lines
9.5 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 1.55 1996/08/28 18:29:51 ache 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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#define ouraddr (BOOTSEG << 4) /* XXX */
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#define NAMEBUF_LEN (8*1024)
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#ifdef NAMEBLOCK
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char *dflt_name ;
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/*char *dflt_name = (char *)0x0000ffb0; */ /* force it to not be in the BSS */
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#endif
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char namebuf[NAMEBUF_LEN];
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struct exec head;
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struct bootinfo bootinfo;
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int loadflags;
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static void loadprog(void);
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/* NORETURN */
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void
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boot(int drive)
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{
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char *ptr;
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int howto;
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char c;
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int ret;
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#ifdef PROBE_KEYBOARD
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if (probe_keyboard()) {
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init_serial();
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loadflags = RB_SERIAL;
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printf("\nNo keyboard found.");
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}
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#endif
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#ifdef FORCE_COMCONSOLE
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init_serial();
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loadflags = RB_SERIAL;
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printf("\nSerial console forced.");
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#endif
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/* Pick up the story from the Bios on geometry of disks */
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for(ret = 0; ret < N_BIOS_GEOM; ret ++)
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bootinfo.bi_bios_geom[ret] = get_diskinfo(ret + 0x80);
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bootinfo.bi_basemem = memsize(0);
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bootinfo.bi_extmem = memsize(1);
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bootinfo.bi_memsizes_valid = 1;
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gateA20();
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/*
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* The default boot device is the first partition in the
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* compatibility slice on the boot drive.
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*/
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dosdev = drive;
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maj = 2;
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unit = drive & 0x7f;
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#ifdef dontneed
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slice = 0;
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part = 0;
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#endif
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if (drive & 0x80) {
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/* Hard drive. Adjust. */
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maj = 0;
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#if BOOT_HD_BIAS > 0
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if (unit >= BOOT_HD_BIAS) {
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/*
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* The drive is probably a SCSI drive with a unit
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* number BOOT_HD_BIAS less than the BIOS drive
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* number.
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*/
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maj = 4;
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unit -= BOOT_HD_BIAS;
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}
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#endif
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}
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#ifdef NAMEBLOCK
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/*
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* this is set by the code in boot2.S
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*/
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if( (*dflt_name++ == 'D') && (*dflt_name++ == 'N')) {
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strcpy(namebuf,dflt_name);
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} else
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#endif /*NAMEBLOCK*/
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loadstart:
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strcpy(namebuf,dflname);/* re-initialize in case of loop */
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name = dflname; /* XXX check if needed */
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/* print this all each time.. (saves space to do so) */
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/* If we have looped, use the previous entries as defaults */
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printf("\n>> FreeBSD BOOT @ 0x%x: %d/%d k of memory\n"
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"Usage: [[[%d:][%s](%d,a)]%s][-abcCdghrsv]\n"
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"Use 1:sd(0,a)kernel to boot sd0 if it is BIOS drive 1\n"
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"Use ? for file list or press Enter for defaults\n\nBoot: ",
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ouraddr, bootinfo.bi_basemem, bootinfo.bi_extmem,
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dosdev & 0x7f, devs[maj], unit, name);
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/*
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* Be paranoid and make doubly sure that the input buffer is empty.
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*/
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if(howto = (loadflags &= RB_SERIAL))
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init_serial(); /* clear all, but leave serial console */
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if (!gets(namebuf)) {
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putchar('\n');
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}
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ptr = namebuf;
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/*
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* now parse out the boot options from what was given to us
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* (or was read from the default string)
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*/
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while ((c = *ptr) != '\0') {
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/*
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* pass any leading (or inter-arg) spaces
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*/
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if (c == ' ') {
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ptr++;
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continue;
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}
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/*
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* If it's an arg, take as many letters as we can
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*/
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if (c == '-') {
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while ((c = *++ptr) != '\0') {
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if (c == ' ')
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break;
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if (c == 'C')
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howto |= RB_CDROM;
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if (c == 'a')
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howto |= RB_ASKNAME;
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if (c == 'b')
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howto |= RB_HALT;
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if (c == 'c')
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howto |= RB_CONFIG;
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if (c == 'd')
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howto |= RB_KDB;
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if (c == 'h') {
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howto ^= RB_SERIAL;
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if (howto & RB_SERIAL)
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init_serial();
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}
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if (c == 'g')
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howto |= RB_GDB;
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if (c == 'r')
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howto |= RB_DFLTROOT;
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if (c == 's')
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howto |= RB_SINGLE;
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if (c == 'v')
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howto |= RB_VERBOSE;
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}
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continue;
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}
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/*
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* we have struck something that's not an arg,
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* nor a space.
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* break it off into a separate string.. "name"
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* The default string will at least hit this..
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*/
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name = ptr;
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while (*++ptr != '\0') {
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if (*ptr == ' ') {
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*ptr++ = '\0';
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break;
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}
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}
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}
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loadflags = howto;
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/*
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* Now use "name" to try open the device and file for reading
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*/
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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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loadprog();
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goto loadstart;
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}
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static void
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loadprog(void)
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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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int i;
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unsigned pad;
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read((void *)&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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/*
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* We assume that the entry address is the same as the lowest text
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* address and that the kernel startup code handles relocation by
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* this address rounded down to a multiple of 16M.
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*/
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startaddr = head.a_entry & 0x00FFFFFF;
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addr = startaddr;
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printf("Booting %d:%s(%d,%c)%s @ 0x%x\n"
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, dosdev & 0x7f
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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 < 0x00100000)
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{
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/*
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* Bail out, instead of risking to damage the BIOS
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* variables, the loader, or the adapter memory area.
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* We don't support loading below 1 MB any more.
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*/
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printf("Start address too low\n");
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return;
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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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/********************************************************/
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xread((void *)addr, head.a_text);
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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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while (addr & PAGE_MASK)
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*(char *)addr++ = 0;
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printf("data=0x%x ", head.a_data);
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xread((void *)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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/*
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* XXX however, we should be checking that we don't load ... into
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* nonexistent memory. A full symbol table is unlikely to fit on 4MB
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* machines.
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*/
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pbzero((void *)addr,head.a_bss);
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addr += head.a_bss;
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/* Pad to a page boundary. */
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pad = (unsigned)addr & PAGE_MASK;
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if (pad != 0) {
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pad = PAGE_SIZE - pad;
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addr += pad;
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}
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bootinfo.bi_symtab = addr;
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/********************************************************/
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/* Copy the symbol table size */
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/********************************************************/
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pcpy(&head.a_syms, (void *)addr, sizeof(head.a_syms));
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addr += sizeof(head.a_syms);
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/********************************************************/
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/* Load the symbol table */
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/********************************************************/
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printf("symbols=[+0x%x+0x%x+0x%x", pad, sizeof(head.a_syms),
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head.a_syms);
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xread((void *)addr, head.a_syms);
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addr += head.a_syms;
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/********************************************************/
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/* Load the string table size */
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/********************************************************/
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read((void *)&i, sizeof(int));
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pcpy(&i, (void *)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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/* Load the string table */
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/********************************************************/
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printf("+0x%x+0x%x]\n", sizeof(int), i);
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xread((void *)addr, i);
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addr += i;
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bootinfo.bi_esymtab = addr;
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/*
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* For backwards compatibility, use the previously-unused adaptor
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* and controller bitfields to hold the slice number.
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*/
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bootdev = MAKEBOOTDEV(maj, (slice >> 4), slice & 0xf, unit, part);
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bootinfo.bi_version = BOOTINFO_VERSION;
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bootinfo.bi_kernelname = name + ouraddr;
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bootinfo.bi_nfs_diskless = NULL;
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bootinfo.bi_size = sizeof(bootinfo);
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printf("total=0x%x entry point=0x%x\n", (int)addr, (int)startaddr);
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startprog((int)startaddr, loadflags | RB_BOOTINFO, bootdev,
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(int)&bootinfo + ouraddr);
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}
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