c38b4f3b91
This is the long-threatened ISO 9660 CD-ROM bootstrap code.
This work has been sponsored by Plutotech International, Inc (who paid
the initial work), and interface business GmbH (where i did most of
the work). A big thanks also goes to Bruce Evans, for his continuing
help and answering my stupid questions.
The code is basically functioning, with the following caveats:
. Rock Ridge attributes are not yet supported.
. Only SCSI CD-ROMs are supported, since i fail to see any possibility
to determine the drive type using BIOS functions. (Even for hard disks,
this determination is done by a big hack only.)
. El Torito specifies a lot of crap and useless misfeatures, but crucial
things like the ability to figure out the CD TOC have been ``forgotten''.
Thus, if you wanna boot a multisession CD, you need to know at which CD
block your session starts, and need to speciffy it using the @ clause.
. None of the CD-ROM controllers i've seen so far implements the full
El Torito specification at all. Adaptec is probably the closest, but
they miss on non-emulation booting (which would be the most logical
choice for us). Thus, the current code bloats the 7.5 KB boot code
up to 1.44 MB, in order to fake a `floppy' image.
If you wanna use it, specify this file as the boot image on the
command-line of the mksiosfs command (option -b).
Caveat emptor: some versions of the Adaptec BIOS might even fail to
access the CD-ROM at all, using the BIOS functions. I think i've
notice this for ver 1.26, the code has been tested with ver 1.23.
The boot string is as follows:
[@sess-start] [filename] [-flags]
sess-start Extend # where the last session starts, measured in
CD-ROM blocks.
filename As usual, but the input is case-insensitive by now
(since we don't grok RR anyway).
flags As usual, but -C (use CDROM root f/s) is default, so
specifying -C will decactivate this option (which is
probably not what you want :).
A lot of cleanup work is probably required, and some of the files
could/should be merged back to biosboot, perhaps made conditional on
some #ifdef. The malloc implementation that comes with cdboot might
also be useful for kzipboot. (I needed a malloc() since the root dir
ain't fixed in size on a CD.)
I've been testing all this with a 2.2-STABLE as the base for biosboot.
I don't expect too many surprises, although i know the biosboot stuff
has been changed a lot in -current lately. I'm sure Bruce will
comment on all this here anyway. :-)
181 lines
5.4 KiB
C
181 lines
5.4 KiB
C
/*
|
|
* Mach Operating System
|
|
* Copyright (c) 1992, 1991 Carnegie Mellon University
|
|
* All Rights Reserved.
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and its
|
|
* documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
|
|
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie Mellon
|
|
* the rights to redistribute these changes.
|
|
*
|
|
* from: Mach, Revision 2.2 92/04/04 11:35:03 rpd
|
|
* $Id$
|
|
*/
|
|
/*
|
|
* Extensions for El Torito CD-ROM booting:
|
|
*
|
|
* Copyright © 1997 Pluto Technologies International, Inc. Boulder CO
|
|
* Copyright © 1997 interface business GmbH, Dresden.
|
|
* All rights reserved.
|
|
*
|
|
* This code has been written by Jörg Wunsch, Dresden.
|
|
* Direct comments to <joerg_wunsch@interface-business.de>.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
|
|
/*
|
|
* Specification packet per El Torito, BIOS int 0x13 fn 0x4b00/0x4b01
|
|
*/
|
|
struct specpacket
|
|
{
|
|
u_char size; /* must be 0x13 */
|
|
u_char mediatype; /*
|
|
* 0 - no emulation
|
|
* 1 - 1.2 MB floppy
|
|
* 2 - 1.44 MB floppy
|
|
* 3 - 2.88 MB floppy
|
|
* 4 - hard disk C:
|
|
*/
|
|
u_char drvno; /* emulated drive number */
|
|
u_char ctrlindx; /* controller index, see El Torito */
|
|
u_int32_t lba; /* LBA of emulated disk drive */
|
|
u_int16_t devspec; /* device specification, see El Torito */
|
|
u_int16_t ubufseg; /* user buffer segment */
|
|
u_int16_t loadseg; /* load segment; 0 => use BIOS default 0x7c0 */
|
|
u_int16_t seccnt; /* number of auto-loaded (virtual) sectors */
|
|
u_char cyls; /* same values as in int 0x13, fn 8 */
|
|
u_char secs;
|
|
u_char heads;
|
|
};
|
|
|
|
/*
|
|
* Disk address packet for extended BIOS int 0x13 fn's 0x41...0x48.
|
|
*/
|
|
struct daddrpacket
|
|
{
|
|
u_char size; /* size of daddrpacket, must be 0x10 */
|
|
u_char reserved1;
|
|
u_char nblocks; /*
|
|
* number of 512-byte blocks to transfer,
|
|
* must be <= 127
|
|
*/
|
|
u_char reserved2;
|
|
u_int16_t boffs; /* bseg:boffs denominate the transfer buffer */
|
|
u_int16_t bseg;
|
|
u_int32_t lba; /* actually a 64-bit type, but 64-bit arith */
|
|
u_int32_t lbahigh; /* is expensive, and we don't really need it */
|
|
};
|
|
|
|
#ifdef DEBUG
|
|
# define DPRINTF(x) printf x
|
|
#else
|
|
# define DPRINTF(x)
|
|
#endif
|
|
|
|
|
|
/* asm.S */
|
|
#if ASM_ONLY
|
|
void real_to_prot(void);
|
|
void prot_to_real(void);
|
|
#endif
|
|
void startprog(unsigned int physaddr, int howto, int bootdev,
|
|
/* XXX struct bootinfo * */ unsigned int bootinfo);
|
|
void pbzero(void *dst, size_t count);
|
|
void pcpy(const void *src, void *dst, size_t count);
|
|
|
|
/* bios.S */
|
|
|
|
int biosread(int dev, int cyl, int head, int sec, int nsec, void *offset);
|
|
int getbootspec(struct specpacket *offset);
|
|
int biosreadlba(struct daddrpacket *daddr);
|
|
void putc(int c);
|
|
int getc(void);
|
|
int ischar(void);
|
|
int get_diskinfo(int drive);
|
|
int memsize(int extended);
|
|
|
|
/* boot.c */
|
|
extern int loadflags;
|
|
|
|
void boot(int drive);
|
|
|
|
/* boot2.S */
|
|
void boot2(void);
|
|
|
|
/* cdrom.c */
|
|
extern u_int32_t sessionstart;
|
|
|
|
int devopen(u_int32_t session);
|
|
void seek(u_int32_t offs);
|
|
int read(u_char *addr, size_t size);
|
|
int xread(u_char *addr, size_t size);
|
|
int openrd(char *name);
|
|
|
|
/* io.c */
|
|
void gateA20(void);
|
|
void printf(const char *format, ...);
|
|
void putchar(int c);
|
|
void delay1ms(void);
|
|
int gets(char *buf);
|
|
int strncasecmp(const char *s1, const char *s2, size_t s);
|
|
void bcopy(const void *from, void *to, size_t len);
|
|
void twiddle(void);
|
|
|
|
/* probe_keyboard.c */
|
|
int probe_keyboard(void);
|
|
|
|
/* serial.S */
|
|
void serial_putc(int ch);
|
|
int serial_getc(void);
|
|
int serial_ischar(void);
|
|
void init_serial(void);
|
|
|
|
/* table.c */
|
|
extern char *devs[];
|
|
extern unsigned long tw_chars;
|
|
|
|
/* malloc.c */
|
|
void *malloc(size_t size);
|
|
void free(void *chunk);
|
|
|
|
/* linker stuff */
|
|
extern void end;
|