b5d89ca8ad
(Boot with the -D flag if you want symbols.) Make it easier to extend `struct bootinfo' without losing either forwards or backwards compatibility. ddb_aout.c: Get the symbol table from wherever the loader put it. Nuke db_symtab[SYMTAB_SPACE]. boot.c: Enable loading of symbols. Align them on a page boundary. Add printfs about the symbol table sizes. Pass the memory sizes to the kernel. Fix initialization of `unit' (it got moved out of the loop). Fix adding the bss size (it got moved inside an ifdef). Initialize serial port when RB_SERIAL is toggled on. Fix comments. Clean up formatting of recently added code. io.c: Clean up formatting of recently added code. netboot/main.c, machdep.c, wd.c: Change names of bootinfo fields. LINT: Nuke SYMTAB_SPACE. Fix comment about DODUMP. Makefile.i386: Nuke use of dbsym. Exclude gcc symbols from kernel unless compiling with -g. Remove unused macro. Fix comments and formatting. genassym.c: Generate defines for some new bootinfo fields. Change names of old ones. locore.s: Copy only the valid part of the `struct bootinfo' passed by the loader. Reserve space for symbol table, if any. machdep.c: Check the memory sizes passed by the loader, if any. Don't use them yet. bootinfo.h: Add a size field so that we can resolve some mismatches between the loader bootinfo and the kernel boot info. The version number is not so good for this because of historical botches and because it's harder to maintain. Add memory size and symbol table fields. Change the names of everything. Hacks to save a few bytes: asm.S, boot.c, boot2.S: Replace `ouraddr' by `(BOOTSEG << 4)'. boot.c: Don't statically initialize `loadflags' to 0. Disable the "REDUNDANT" code that skips the BIOS variables. Eliminate `total'. Combine some more printfs. boot.h, disk.c, io.c, table.c: Move all statically initialzed data to table.c. io.c: Don't put the A20 gate bits in a variable.
281 lines
7.0 KiB
C
281 lines
7.0 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, Revision 2.2 92/04/04 11:35:49 rpd
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* $Id: disk.c,v 1.6 1994/12/18 19:14:19 bde Exp $
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*/
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/*
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* 93/10/08 bde
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* If there is no 386BSD partition, initialize the label sector with
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* LABELSECTOR instead of with garbage.
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*
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* 93/08/22 bde
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* Fixed reading of bad sector table. It is at the end of the 'c'
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* partition, which is not always at the end of the disk.
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*/
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#include "boot.h"
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#ifdef DO_BAD144
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#include <sys/dkbad.h>
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#endif DO_BAD144
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#include <sys/disklabel.h>
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#define BIOS_DEV_FLOPPY 0x0
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#define BIOS_DEV_WIN 0x80
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#define BPS 512
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#define SPT(di) ((di)&0xff)
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#define HEADS(di) ((((di)>>8)&0xff)+1)
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#ifdef DO_BAD144
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struct dkbad dkb;
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int do_bad144;
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int bsize;
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#endif DO_BAD144
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int spt, spc;
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char *iodest;
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struct fs *fs;
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struct inode inode;
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int dosdev, unit, slice, part, maj, boff, poff, bnum, cnt;
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/*#define EMBEDDED_DISKLABEL 1*/
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extern struct disklabel disklabel;
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/*struct disklabel disklabel;*/
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devopen()
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{
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struct dos_partition *dptr;
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struct disklabel *dl;
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int dosdev = inode.i_dev;
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int i, sector, di;
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di = get_diskinfo(dosdev);
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spc = (spt = SPT(di)) * HEADS(di);
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if (dosdev == 2)
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{
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boff = 0;
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part = (spt == 15 ? 3 : 1);
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}
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else
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{
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#ifdef EMBEDDED_DISKLABEL
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dl = &disklabel;
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#else EMBEDDED_DISKLABEL
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Bread(dosdev, 0);
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dptr = (struct dos_partition *)(((char *)0)+DOSPARTOFF);
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sector = LABELSECTOR;
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for (i = 0; i < NDOSPART; i++, dptr++)
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if (dptr->dp_typ == DOSPTYP_386BSD) {
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slice = 1 + i;
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sector = dptr->dp_start + LABELSECTOR;
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break;
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}
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Bread(dosdev, sector++);
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dl=((struct disklabel *)0);
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disklabel = *dl; /* structure copy (maybe useful later)*/
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#endif EMBEDDED_DISKLABEL
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if (dl->d_magic != DISKMAGIC) {
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printf("bad disklabel");
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return 1;
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}
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if( (maj == 4) || (maj == 0) || (maj == 1))
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{
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if (dl->d_type == DTYPE_SCSI)
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{
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maj = 4; /* use scsi as boot dev */
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}
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else
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{
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maj = 0; /* must be ESDI/IDE */
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}
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}
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boff = dl->d_partitions[part].p_offset;
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#ifdef DO_BAD144
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bsize = dl->d_partitions[part].p_size;
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do_bad144 = 0;
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if (dl->d_flags & D_BADSECT) {
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/* this disk uses bad144 */
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int i;
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int dkbbnum;
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struct dkbad *dkbptr;
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/* find the first readable bad sector table */
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/* some of this code is copied from ufs/ufs_disksubr.c */
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/* including the bugs :-( */
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/* read a bad sector table */
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#define BAD144_PART 2 /* XXX scattered magic numbers */
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#define BSD_PART 0 /* XXX should be 2 but bad144.c uses 0 */
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if (dl->d_partitions[BSD_PART].p_offset != 0)
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dkbbnum = dl->d_partitions[BAD144_PART].p_offset
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+ dl->d_partitions[BAD144_PART].p_size;
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else
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dkbbnum = dl->d_secperunit;
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dkbbnum -= dl->d_nsectors;
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if (dl->d_secsize > DEV_BSIZE)
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dkbbnum *= dl->d_secsize / DEV_BSIZE;
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else
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dkbbnum /= DEV_BSIZE / dl->d_secsize;
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i = 0;
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do_bad144 = 0;
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do {
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/* XXX: what if the "DOS sector" < 512 bytes ??? */
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Bread(dosdev, dkbbnum + i);
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dkbptr = (struct dkbad *) 0;
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/* XXX why is this not in <sys/dkbad.h> ??? */
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#define DKBAD_MAGIC 0x4321
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if (dkbptr->bt_mbz == 0 &&
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dkbptr->bt_flag == DKBAD_MAGIC) {
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dkb = *dkbptr; /* structure copy */
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do_bad144 = 1;
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break;
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}
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i += 2;
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} while (i < 10 && i < dl->d_nsectors);
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if (!do_bad144)
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printf("Bad bad sector table\n");
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else
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printf("Using bad sector table at %d\n", dkbbnum+i);
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}
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#endif DO_BAD144
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}
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return 0;
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}
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devread()
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{
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int offset, sector = bnum;
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int dosdev = inode.i_dev;
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for (offset = 0; offset < cnt; offset += BPS)
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{
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Bread(dosdev, badsect(dosdev, sector++));
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bcopy(0, iodest+offset, BPS);
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}
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}
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#define I_ADDR ((void *) 0) /* XXX where all reads go */
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/* Read ahead buffer large enough for one track on a 1440K floppy. For
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* reading from floppies, the bootstrap has to be loaded on a 64K boundary
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* to ensure that this buffer doesn't cross a 64K DMA boundary.
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*/
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#define RA_SECTORS 18
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static char ra_buf[RA_SECTORS * BPS];
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static int ra_dev;
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static int ra_end;
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static int ra_first;
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Bread(dosdev,sector)
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int dosdev,sector;
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{
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if (dosdev != ra_dev || sector < ra_first || sector >= ra_end)
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{
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int cyl, head, sec, nsec;
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cyl = sector/spc;
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head = (sector % spc) / spt;
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sec = sector % spt;
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nsec = spt - sec;
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if (nsec > RA_SECTORS)
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nsec = RA_SECTORS;
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twiddle();
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if (biosread(dosdev, cyl, head, sec, nsec, ra_buf) != 0)
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{
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nsec = 1;
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twiddle();
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while (biosread(dosdev, cyl, head, sec, nsec, ra_buf) != 0) {
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printf("Error: C:%d H:%d S:%d\n", cyl, head, sec);
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twiddle();
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}
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}
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ra_dev = dosdev;
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ra_first = sector;
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ra_end = sector + nsec;
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}
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bcopy(ra_buf + (sector - ra_first) * BPS, I_ADDR, BPS);
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}
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badsect(dosdev, sector)
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int dosdev, sector;
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{
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int i;
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#ifdef DO_BAD144
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if (do_bad144) {
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u_short cyl;
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u_short head;
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u_short sec;
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int newsec;
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struct disklabel *dl = &disklabel;
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/* XXX */
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/* from wd.c */
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/* bt_cyl = cylinder number in sorted order */
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/* bt_trksec is actually (head << 8) + sec */
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/* only remap sectors in the partition */
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if (sector < boff || sector >= boff + bsize) {
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goto no_remap;
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}
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cyl = sector / dl->d_secpercyl;
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head = (sector % dl->d_secpercyl) / dl->d_nsectors;
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sec = sector % dl->d_nsectors;
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sec = (head<<8) + sec;
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/* now, look in the table for a possible bad sector */
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for (i=0; i<126; i++) {
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if (dkb.bt_bad[i].bt_cyl == cyl) {
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/* found same cylinder */
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if (dkb.bt_bad[i].bt_trksec == sec) {
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/* FOUND! */
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break;
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}
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} else if (dkb.bt_bad[i].bt_cyl > cyl) {
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i = 126;
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break;
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}
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}
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if (i == 126) {
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/* didn't find bad sector */
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goto no_remap;
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}
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/* otherwise find replacement sector */
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if (dl->d_partitions[BSD_PART].p_offset != 0)
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newsec = dl->d_partitions[BAD144_PART].p_offset
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+ dl->d_partitions[BAD144_PART].p_size;
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else
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newsec = dl->d_secperunit;
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newsec -= dl->d_nsectors + i + 1;
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return newsec;
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}
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#endif DO_BAD144
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no_remap:
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return sector;
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}
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