9c6e0c69be
do fit, and beeping in case of an overflow. . Drop a comment about the ``FORCE_COMCONSOLE'' option into README.serial. . Increase the name buffer for the root directory from 100 bytes to 8 KB; this is in no way ideal, but (IMHO) the best that can be done by now. People did encounter problems with their root dir name listing overflowing the allocated buffer space. Once we've got the three-stage boot, we should implement some basic malloc(). Swap space is already getting tight now, perhaps the swap should go into another 64 KB segment instead. . Make the keyboard probe less paranoid. It should not give up in case of a keyboard that's continuously demanding RESEND's. Even though the keyboard reset apparently has not been reported to be complete, it's at the very least proven that there IS something like a keyboard available. This solves problems with the ``Gateway-2000 AllKey programmable'' (sp?) keyboard, that experienced a total hang with the previous probe. Thanks goes to Scott Blachowicz <scott@statsci.com> for his extensive testing of my various interim (debugging) bootblocks to get this working.
315 lines
8.7 KiB
C
315 lines
8.7 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 1.39 1995/04/20 23:05:23 julian 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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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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/* NORETURN */
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void
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boot(int drive)
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{
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int ret;
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char *t;
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#ifndef FORCE_COMCONSOLE
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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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#else
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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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* As a default set it to the first partition of the boot *
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* floppy or hard drive *
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* Define BOOT_HT to boot sd0 when wd0 is also installed *
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\***************************************************************/
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part = 0;
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unit = drive & 0x7f;
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#ifdef BOOT_HD
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maj = (drive&0x80 ? 0 : 1); /* a good first bet */
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#else
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maj = (drive&0x80 ? 0 : 2); /* a good first bet */
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#endif
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loadstart:
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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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"Use hd(1,a)/kernel to boot sd0 when wd0 is also installed.\n"
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"Usage: [[%s(%d,a)]%s][-abcCdhrsv]\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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devs[maj], unit, name);
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/*
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* Be paranoid and make doubly sure that the input
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* buffer is empty.
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*/
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if (loadflags & RB_SERIAL)
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init_serial();
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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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void
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loadprog(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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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 %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 < 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 & CLOFSET)
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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 % NBPG;
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if (pad != 0) {
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pad = NBPG - 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((void *)&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((void *)&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] ", 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, howto | RB_BOOTINFO, bootdev,
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(int)&bootinfo + ouraddr);
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}
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void
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getbootdev(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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if (c == 'C')
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{ *howto |= RB_CDROM; continue; }
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if (c == 'a')
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{ *howto |= RB_ASKNAME; continue; }
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if (c == 'b')
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{ *howto |= RB_HALT; continue; }
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if (c == 'c')
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{ *howto |= RB_CONFIG; continue; }
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if (c == 'd')
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{ *howto |= RB_KDB; continue; }
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if (c == 'r')
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{ *howto |= RB_DFLTROOT; continue;}
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if (c == 's')
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{ *howto |= RB_SINGLE; continue;}
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if (c == 'v')
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{ *howto |= RB_VERBOSE; continue;}
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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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continue;
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}
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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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