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# Copyright (c) KATO Takenori, 1999, 2000, 2007.
#
# All rights reserved. Unpublished rights reserved under the copyright
# laws of Japan.
#
# 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 as
# the first lines of this file unmodified.
# 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 ``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 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.
#
# $FreeBSD$
#
.global main
.code16
.text
main:
# Check hireso mode
movw $0x501, %bx # BIOS_FLAG
call read_biosparam
testb $0x08, %dl
jz normalmode
movb $1, ishireso
normalmode:
call sc_init
# Display title and copyright.
movw $title, %di
call sc_puts
xorw %cx, %cx
movw $1, %dx
call sc_goto
movw $copyright, %di
call sc_puts
# Scan hard drives
xorw %si, %si # number of partition
call scan_sasi # SASI/IDE
call scan_scsi # SCSI
movw %si, ndevice
orw %si, %si
jnz drives_found
jmp exit # No hard drives
drives_found:
# Setup sector size dependent parameters
movw %si, %cx # %cx = number of devices
setup_loop:
movw %cx, %di
decw %di
shlw %di
movw secsize(%di), %ax
cmpw $1024, %ax
je setup_1024
cmpw $512, %ax
je setup_512
# 256 bytes/sector
movw $0x100, partoff(%di)
movw $0x0fa, defflagoff(%di)
movw $0x0fb, defpartoff(%di)
movw $8, maxpart(%di)
jmp setup_secsize_end
# 1024 bytes/sector
setup_1024:
# XXX Fix me!
movw $0x400, partoff(%di)
movw $0x3fa, defflagoff(%di)
movw $0x3fb, defpartoff(%di)
movb $32, maxpart(%di)
jmp setup_secsize_end
# 512 bytes/sector
setup_512:
movw $0x200, partoff(%di)
movw $0x1fa, defflagoff(%di)
movw $0x1fb, defpartoff(%di)
movb $16, maxpart(%di)
setup_secsize_end:
loop setup_loop
# For debug with floppy, fake the parameter.
movw $0x584, %bx # DISK_BOOT
call read_biosparam
andb $0xf0, %dl
cmpb $0x90, %ah
jne boot_from_hdd
movb daua, %dl
call write_biosparam
boot_from_hdd:
movw $500, %cx
wait_0_5:
call wait1ms
loop wait_0_5
# If the TAB is pressed, don't try to boot from default partition
xorw %di, %di # flag
wait_key_release:
call sc_iskeypress
orw %ax, %ax
jz key_release # KBD buffer empty.
call sc_getc
cmpb $0x0f, %ah # TAB
jne wait_key_release
# TAB pressed
movw $1, %di
jmp wait_key_release
key_release:
orw %di, %di
jnz dont_try_default # TAB pressed.
call trydefault
# Default partition not found.
dont_try_default:
call show_usage
call showdevices
call selector
exit:
ret
#
# Display usage
#
show_usage:
movw $44, %cx
movw $3, %dx
call sc_goto
movw $msg_usage1, %di
call sc_puts
movw $44, %cx
movw $4, %dx
call sc_goto
movw $msg_usage2, %di
call sc_puts
movw $44, %cx
movw $5, %dx
call sc_goto
movw $msg_usage3, %di
call sc_puts
movw $44, %cx
movw $7, %dx
call sc_goto
movw $msg_usage4, %di
call sc_puts
movw $44, %cx
movw $8, %dx
call sc_goto
movw $msg_usage5, %di
call sc_puts
movw $44, %cx
movw $9, %dx
call sc_goto
movw $msg_usage6, %di
call sc_puts
movw $44, %cx
movw $10, %dx
call sc_goto
movw $msg_usage7, %di
call sc_puts
movw $44, %cx
movw $11, %dx
call sc_goto
movw $msg_usage8, %di
call sc_puts
movw $44, %cx
movw $16, %dx
call sc_goto
movw $msg_usage9, %di
call sc_puts
movw $44, %cx
movw $17, %dx
call sc_goto
movw $msg_usage10, %di
call sc_puts
movw $44, %cx
movw $18, %dx
call sc_goto
movw $msg_usage11, %di
call sc_puts
movw $44, %cx
movw $19, %dx
call sc_goto
movw $msg_usage12, %di
call sc_puts
ret
#
# Display device list
#
showdevices:
movw $2, %cx
movw $4, %dx
call sc_goto
movw $msg_device, %di
call sc_puts
xorw %si, %si # %si = device number
movw ndevice, %cx # %cx = number of devices
showdev_loop:
push %cx
movw $2, %cx
movw $5, %dx
addw %si, %dx
call sc_goto
# Check DA
movb daua(%si), %al
push %ax
andb $0xf0, %al
cmpb $0x80, %al
je show_sasi
cmpb $0xa0, %al
je show_scsi
# unknown device
movw $msg_unknown, %di
call sc_puts
jmp showunit
# SASI
show_sasi:
movw $msg_sasi, %di
call sc_puts
jmp showunit
# SCSI
show_scsi:
movw $msg_scsi, %di
call sc_puts
# Display unit number.
showunit:
pop %ax
andb $0x0f, %al
addb $'0', %al
call sc_putc
incw %si
pop %cx
loop showdev_loop
movw ndevice, %dx
addw $5, %dx
movw $2, %cx
call sc_goto
movw $msg_exitmenu, %di
call sc_puts
ret
.data
.global curdevice, ndevice
ndevice: .word 0 # number of device
curdevice: .word 0 # current device
.global ishireso
ishireso: .byte 0
title: .asciz "PC98 Boot Selector Version 1.2"
copyright: .ascii "(C)Copyright 1999-2007 KATO Takenori. "
.asciz "All rights reserved."
msg_device: .asciz "Device"
msg_sasi: .asciz "SASI/IDE unit "
msg_scsi: .asciz "SCSI ID "
msg_unknown: .asciz "unknown unit "
msg_exitmenu: .asciz "Exit this menu"
msg_usage1: .asciz "Device list"
msg_usage2: .asciz "UP, DOWN: select boot device"
msg_usage3: .asciz "RETURN: move to slice list"
msg_usage4: .asciz "Slice list"
msg_usage5: .asciz "UP, DOWN: select boot slice"
msg_usage6: .asciz "RETURN: boot"
msg_usage7: .asciz "SPACE: toggle default"
msg_usage8: .asciz "ESC: move to device list"
msg_usage9: .asciz "LEGEND"
msg_usage10: .asciz ">>: selected device/slice"
msg_usage11: .asciz "*: default slice to boot"
msg_usage12: .asciz "!: unbootable slice"
.bss
.global daua, secsize, defflagoff, defpartoff
.global maxpart, partoff
daua: .space 12 # DA/DU list
secsize: .space 12 * 2 # Sector soize
defflagoff: .space 12 * 2
defpartoff: .space 12 * 2
maxpart: .space 12 * 2
partoff: .space 12 * 2
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