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. :-)
115 lines
3.3 KiB
Makefile
115 lines
3.3 KiB
Makefile
# $Id$
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#
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PROG= boot
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# Order is very important on the SRCS line for this prog
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SRCS= start.S table.c boot2.S boot.c asm.S bios.S serial.S
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SRCS+= probe_keyboard.c io.c cdrom.c malloc.c
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.PATH: ${.CURDIR}/../biosboot
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BINDIR= /usr/mdec
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BINMODE= 444
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CFLAGS= -O2 -malign-functions=0 -malign-jumps=0 -malign-loops=0 \
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-mno-486 \
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-DDO_BAD144 -DBOOTWAIT=${BOOTWAIT} -DTIMEOUT=${TIMEOUT}
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CFLAGS+= -DBOOTSEG=${BOOTSEG} -DBOOTSTACK=${BOOTSTACK}
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CFLAGS+= -I${.CURDIR}/../../.. -I${.CURDIR}/../biosboot
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CFLAGS+= ${CWARNFLAGS}
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#CFLAGS+= -DDEBUG
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# Probe the keyboard and use the serial console if the keyboard isn't found.
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.if defined(BOOT_PROBE_KEYBOARD)
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CFLAGS+= -DPROBE_KEYBOARD
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.endif
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# Probe the keyboard lock and use the serial console if the keyboard is locked.
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.if defined(BOOT_PROBE_KEYBOARD_LOCK)
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CFLAGS+= -DPROBE_KEYBOARD_LOCK
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.endif
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# Force use of the serial console.
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.if defined(BOOT_FORCE_COMCONSOLE)
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CFLAGS+= -DFORCE_COMCONSOLE
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.endif
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# By default, if a serial port is going to be used as console, use COM1
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# (aka /dev/ttyd0).
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BOOT_COMCONSOLE_PORT?=0x3F8
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CFLAGS+= -DCOMCONSOLE=${BOOT_COMCONSOLE_PORT}
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BOOT_COMCONSOLE_SPEED?=9600
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CFLAGS+= -DCONSPEED=${BOOT_COMCONSOLE_SPEED}
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# Enable code to take the default boot string from a fixed location on the
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# disk. See nextboot(8) and README.386BSD for more info.
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#CFLAGS+= -DNAMEBLOCK
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#CFLAGS+= -DNAMEBLOCK_WRITEBACK
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# Bias the conversion from the BIOS drive number to the FreeBSD unit number
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# for hard disks. This may be useful for people booting in a mixed IDE/SCSI
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# environment (set BOOT_HD_BIAS to the number of IDE drives).
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#CFLAGS+= -DBOOT_HD_BIAS=1
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#
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# Details: this only applies if BOOT_HD_BIAS > 0. If the BIOS drive number
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# for the boot drive is >= BOOT_HD_BIAS, then the boot drive is assumed to
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# be SCSI and have unit number (BIOS_drive_number - BOOT_HD_BIAS). E.g.,
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# BOOT_HD_BIAS=1 makes BIOS drive 1 correspond to 1:sd(0,a) instead of
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# 1:wd(1,a). If `sd' is given explicitly, then the drive is assumed to be
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# SCSI and have BIOS drive number (sd_unit_number + BOOT_HD_BIAS). E.g.,
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# BOOT_HD_BIAS=1 makes sd(0,a) correspond to 1:sd(0,a) instead of 0:sd(0,a).
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CLEANFILES+= boot.nohdr boot.strip boot1 boot2 sizetest
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LDFLAGS+= -N -T 0 -nostdlib
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#LINKS= ${BINDIR}/sdboot ${BINDIR}/wdboot\
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# ${BINDIR}/sdboot ${BINDIR}/fdboot\
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# ${BINDIR}/bootsd ${BINDIR}/bootwd\
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# ${BINDIR}/bootsd ${BINDIR}/bootfd
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NOSHARED= YES
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NOMAN=
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STRIP=
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# tunable timeout parameter, waiting for keypress, calibrated in ms
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BOOTWAIT?= 5000
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# tunable timeout during string input, calibrated in ms
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#TIMEOUT?= 30000
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# Location that boot2 is loaded at
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BOOTSEG= 0x1000
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# Offset in BOOTSEG for the top of the stack, keep this 16 byte aligned
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BOOTSTACK= 0xFFF0
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boot.strip: boot
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cp -p boot boot.strip
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strip boot.strip
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size boot.strip
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boot.nohdr: boot.strip
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dd if=boot.strip of=boot.nohdr ibs=32 skip=1 obs=1024b
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ls -l boot.nohdr
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boot1: boot.nohdr
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dd if=boot.nohdr of=boot1 bs=512 count=1
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boot2: boot.nohdr
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dd if=boot.nohdr of=boot2 bs=512 skip=1
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@dd if=boot2 skip=14 of=sizetest 2> /dev/null
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@if [ -s sizetest ] ; then \
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echo "boot2 is too big" >&2 ; \
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rm boot2 ; \
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exit 2 ; \
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fi
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boot.img: boot.nohdr
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dd if=boot.nohdr of=boot.img bs=1440k count=1 conv=sync
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all: boot.img
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install:
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${INSTALL} ${COPY} -o ${BINOWN} -g ${BINGRP} -m ${BINMODE}\
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boot.img ${DESTDIR}${BINDIR}/cdboot
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.include <bsd.kern.mk>
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.include <bsd.prog.mk>
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