freebsd-nq/sys/boot/pc98/boot0.5/selector.s
KATO Takenori e9b13dd6ec Added PC-98 HDD boot manager. The boot0 is the `IPL' which occupies
sector 0 of a disk and boot0.5 is the `boot selector' which starts
from address 0x400.  The IPL loads boot0.5 and boot0.5 loads bootblock
of a slice.

The boot manager stuff was developed by me (kato) with Borland C++,
and then, translated into bcc in the ports collection by Nokubi-san.
After that, boot0 has been translated into gas with the .code16
directive by Takahashi-san (nyan) and boot0.5 has been rewritten in
gas by me.
2000-08-02 08:46:08 +00:00

445 lines
7.9 KiB
ArmAsm

# Copyright (c) KATO Takenori, 1999, 2000.
#
# 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 Unpublished rights reserved under the copyright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.
#
# $FreeBSD$
#
.code16
.text
#
# Display partition table.
#
showpartitions:
# Clear partion table area
movw $16, %cx
clear_part:
push %cx
movw %cx, %dx
decw %dx
addw $5, %dx
movw $20, %cx
call sc_goto
movw $msg_spc, %di
call sc_puts
pop %cx
loop clear_part
# Check `Exit' menu
movw curdevice, %ax
cmpw ndevice, %ax
je no_slice
# XXX Move this to a suitable place!
movw $22, %cx
movw $4, %dx
call sc_goto
movw $msg_slice, %di
call sc_puts
# Check the number of partitions
movw npartition, %cx
orw %cx, %cx
jnz partitionexist
no_slice:
# Just show the `no slice' message.
movw $22, %cx
movw $5, %dx
call sc_goto
movw $msg_noslice, %di
call sc_puts
ret
partitionexist:
xorw %si, %si # %si = partition number
showpart_loop:
push %cx # %cx = number of partitions
movw $22, %cx
movw %si, %dx
addw $5, %dx
call sc_goto
movw %si, %di
movb $5, %cl
shlw %cl, %di
addw $0x10, %di # SYSM field
# SYSM: space filled string. Don't use sc_puts.
movw $16, %cx
showpart_name:
push %cx
movb parttable(%di), %al
call sc_putc
incw %di
pop %cx
loop showpart_name
incw %si
pop %cx
loop showpart_loop
ret
#
# Show default slice indicator
# If the default boot slice exists, `*' indicator will be showed.
#
showdefaultslicemark:
cmpb $0x80, defpartflag
je defpartexist
ret
defpartexist:
movw npartition, %cx
defslice_loop:
movw %cx, %bx
decw %bx
push %cx
push %bx
movw $40, %cx
movw %bx, %dx
addw $5, %dx
call sc_goto
pop %bx
pop %cx
movb defpartnum, %al
cmpb partnum(%bx), %al
jne nomatch
movb $'*', %al
call sc_putc
jmp defslice_done
nomatch:
movb $' ', %al
call sc_putc
defslice_done:
loop defslice_loop
ret
#
# Hide default slice indicator
#
hidedefaultslicemark:
movw $16, %cx
hidedefslice_loop:
push %cx
movw %cx, %dx
addw $4, %dx
movw $40, %cx
call sc_goto
movb $' ', %al
call sc_putc
pop %cx
loop hidedefslice_loop
ret
#
# Toggle default slice
#
toggle_default:
cmpb $0x80, defpartflag
jne set_default
# Clear default
movb $0, defpartflag
call write_ipl # Restore
call hidedefaultslicemark
ret
# Set default slice
set_default:
movw curpartition, %si
movb partnum(%si), %al # %al = real partition number
movb $5, %cl
shlw %cl, %si
# Default slice must be bootable
testb $0x80, parttable(%si)
jnz curpart_bootable
# Current partition is not bootable.
ret
curpart_bootable:
movb $0x80, defpartflag
movb %al, defpartnum
call write_ipl # Restore
call showdefaultslicemark
ret
#
# Show/hide cursor
#
show_devcurs:
xorw %cx, %cx
movw curdevice, %dx
addw $5, %dx
call sc_goto
movb $'>', %al
call sc_putc
movb $'>', %al
call sc_putc
ret
hide_devcurs:
xorw %cx, %cx
movw curdevice, %dx
addw $5, %dx
call sc_goto
movb $' ', %al
call sc_putc
movb $' ', %al
call sc_putc
ret
show_slicecurs:
movw $20, %cx
movw curpartition, %dx
addw $5, %dx
call sc_goto
movb $'>', %al
call sc_putc
movb $'>', %al
call sc_putc
ret
hide_slicecurs:
movw $20, %cx
movw curpartition, %dx
addw $5, %dx
call sc_goto
movb $' ', %al
call sc_putc
movb $' ', %al
call sc_putc
ret
isforceboot:
xorw %cx, %cx
movw $20, %dx
call sc_goto
movw $msg_force, %di
call sc_puts
call sc_getc
push %ax
xorw %cx, %cx
movw $20, %dx
call sc_goto
movw $msg_forceclr, %di
call sc_puts
pop %ax
cmpb $0x15, %ah
je force_yes
xorw %ax, %ax
ret
force_yes:
movw $1, %ax
ret
#
# Main loop for device mode
#
devmode:
call read_ipl
call hidedefaultslicemark
call showpartitions
call showdefaultslicemark
call show_devcurs
movw $2, %cx
movw $4, %dx
call sc_goto
movb $0xe5, %al
movw $6, %cx
call sc_setattr
movw $22, %cx
movw $4, %dx
call sc_goto
movb $0xe1, %al
movw $5, %cx
call sc_setattr
movw $44, %cx
movw $3, %dx
call sc_goto
movb $0xe5, %al
movw $11, %cx
call sc_setattr
movw $44, %cx
movw $7, %dx
call sc_goto
movb $0xe1, %al
movw $10, %cx
call sc_setattr
devmode_loop:
call sc_getc
movw ndevice, %bx
cmpb $0x3a, %ah # UP
je dev_up
cmpb $0x3d, %ah # DOWN
je dev_down
cmpb $0x3c, %ah # RIGHT
je dev_right
cmpb $0x1c, %ah # RETURN
jne devmode_loop
cmpw curdevice, %bx
jne dev_right
movw $3, mode # N88-BASIC
ret
dev_up:
cmpw $0, curdevice
je devmode_loop
call hide_devcurs
decw curdevice
call read_ipl
call hidedefaultslicemark
call showpartitions
call showdefaultslicemark
call show_devcurs
jmp devmode_loop
dev_down:
cmpw curdevice, %bx
je devmode_loop
call hide_devcurs
incw curdevice
call read_ipl
call hidedefaultslicemark
call showpartitions
call showdefaultslicemark
call show_devcurs
jmp devmode_loop
dev_right:
cmpw curdevice, %bx
je devmode_loop
movw $1, mode # Slice mode
ret
#
# main loop for slice mode
#
slicemode:
movw $0, curpartition
call show_slicecurs
movw $2, %cx
movw $4, %dx
call sc_goto
movb $0xe1, %al
movw $6, %cx
call sc_setattr
movw $22, %cx
movw $4, %dx
call sc_goto
movb $0xe5, %al
movw $5, %cx
call sc_setattr
movw $44, %cx
movw $3, %dx
call sc_goto
movb $0xe1, %al
movw $11, %cx
call sc_setattr
movw $44, %cx
movw $7, %dx
call sc_goto
movb $0xe5, %al
movw $10, %cx
call sc_setattr
slicemode_loop:
call sc_getc
cmpb $0x3a, %ah # UP
je slice_up
cmpb $0x3d, %ah # DOWN
je slice_down
cmpb $0x3b, %ah # LEFT
je slice_esc
cmpb $0x00, %ah # ESC
je slice_esc
cmpb $0x1c, %ah # RETURN
je slice_ret
cmpb $0x34, %ah # SPC
je slice_spc
cmpb $0x62, %ah # f1
je slice_spc
jmp slicemode_loop
slice_up:
cmpw $0, curpartition
je slicemode_loop
call hide_slicecurs
decw curpartition
call show_slicecurs
jmp slicemode_loop
slice_down:
movw curpartition, %bx
movw npartition, %ax
decw %ax
cmpw %bx, %ax
je slicemode_loop
call hide_slicecurs
incw curpartition
call show_slicecurs
jmp slicemode_loop
slice_esc:
movw $0, mode # Device mode
ret
slice_spc:
call toggle_default
jmp slicemode_loop
slice_ret:
# Test bit 7 of mid
movw curpartition, %si
movb $5, %cl
shlw %cl, %si
testb $0x80, parttable(%si)
jnz bootable_slice
call isforceboot
orw %ax, %ax
jz slicemode_loop
bootable_slice:
call boot
jmp slicemode_loop
#
# Main loop
#
.global selector
selector:
movw $0, mode
selector_loop:
cmpw $0, mode
je status_dev
cmpw $1, mode
je status_slice
ret
status_dev:
call devmode
jmp selector_loop
status_slice:
call slicemode
jmp selector_loop
.data
.global curpartition
curpartition: .word 0 # current patition
mode: .word 0
msg_spc: .asciz " "
msg_slice: .asciz "Slice"
msg_noslice: .asciz "no slice"
msg_force: .asciz "This slice is not bootable. Continue? (Y / [N])"
msg_forceclr: .asciz " "