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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 Unpublished rights reserved under the copyright # laws of Japan.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: release/9.1.0/sys/boot/pc98/boot0.5/boot0.5.s 168457 2007-04-07 08:37:04Z kato $ # .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