f2a081cfe4
- Added magic numbers to pretend the NEC original program version
2.70.
- Added string display routine with Shift-JIS code support.
- Added three nop instructions at start1 in start.s since the
installaer of the IPLware put 'call $0x09ab' instruction.
- Put the near return instruction at 0x9ab in selector.s.
Since the Shit-JIS display routine must be located at 0x1243, the
linker script file (ldscript) is applied.
294 lines
6.3 KiB
ArmAsm
294 lines
6.3 KiB
ArmAsm
# Copyright (c) KATO Takenori, 1999, 2000, 2007.
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#
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# All rights reserved. Unpublished rights reserved under the copyright
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# laws of Japan.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer as
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# the first lines of this file unmodified.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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.global main
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.code16
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.text
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main:
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# Check hireso mode
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movw $0x501, %bx # BIOS_FLAG
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call read_biosparam
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testb $0x08, %dl
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jz normalmode
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movb $1, ishireso
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normalmode:
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call sc_init
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# Display title and copyright.
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movw $title, %di
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call sc_puts
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xorw %cx, %cx
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movw $1, %dx
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call sc_goto
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movw $copyright, %di
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call sc_puts
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# Scan hard drives
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xorw %si, %si # number of partition
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call scan_sasi # SASI/IDE
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call scan_scsi # SCSI
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movw %si, ndevice
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orw %si, %si
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jnz drives_found
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jmp exit # No hard drives
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drives_found:
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# Setup sector size dependent parameters
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movw %si, %cx # %cx = number of devices
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setup_loop:
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movw %cx, %di
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decw %di
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shlw %di
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movw secsize(%di), %ax
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cmpw $1024, %ax
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je setup_1024
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cmpw $512, %ax
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je setup_512
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# 256 bytes/sector
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movw $0x100, partoff(%di)
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movw $0x0fa, defflagoff(%di)
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movw $0x0fb, defpartoff(%di)
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movw $8, maxpart(%di)
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jmp setup_secsize_end
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# 1024 bytes/sector
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setup_1024:
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# XXX Fix me!
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movw $0x400, partoff(%di)
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movw $0x3fa, defflagoff(%di)
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movw $0x3fb, defpartoff(%di)
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movb $32, maxpart(%di)
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jmp setup_secsize_end
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# 512 bytes/sector
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setup_512:
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movw $0x200, partoff(%di)
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movw $0x1fa, defflagoff(%di)
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movw $0x1fb, defpartoff(%di)
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movb $16, maxpart(%di)
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setup_secsize_end:
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loop setup_loop
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# For debug with floppy, fake the parameter.
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movw $0x584, %bx # DISK_BOOT
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call read_biosparam
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andb $0xf0, %dl
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cmpb $0x90, %ah
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jne boot_from_hdd
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movb daua, %dl
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call write_biosparam
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boot_from_hdd:
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movw $500, %cx
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wait_0_5:
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call wait1ms
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loop wait_0_5
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# If the TAB is pressed, don't try to boot from default partition
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xorw %di, %di # flag
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wait_key_release:
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call sc_iskeypress
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orw %ax, %ax
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jz key_release # KBD buffer empty.
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call sc_getc
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cmpb $0x0f, %ah # TAB
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jne wait_key_release
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# TAB pressed
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movw $1, %di
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jmp wait_key_release
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key_release:
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orw %di, %di
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jnz dont_try_default # TAB pressed.
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call trydefault
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# Default partition not found.
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dont_try_default:
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call show_usage
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call showdevices
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call selector
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exit:
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ret
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#
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# Display usage
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#
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show_usage:
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movw $44, %cx
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movw $3, %dx
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call sc_goto
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movw $msg_usage1, %di
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call sc_puts
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movw $44, %cx
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movw $4, %dx
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call sc_goto
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movw $msg_usage2, %di
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call sc_puts
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movw $44, %cx
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movw $5, %dx
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call sc_goto
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movw $msg_usage3, %di
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call sc_puts
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movw $44, %cx
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movw $7, %dx
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call sc_goto
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movw $msg_usage4, %di
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call sc_puts
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movw $44, %cx
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movw $8, %dx
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call sc_goto
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movw $msg_usage5, %di
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call sc_puts
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movw $44, %cx
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movw $9, %dx
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call sc_goto
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movw $msg_usage6, %di
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call sc_puts
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movw $44, %cx
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movw $10, %dx
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call sc_goto
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movw $msg_usage7, %di
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call sc_puts
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movw $44, %cx
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movw $11, %dx
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call sc_goto
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movw $msg_usage8, %di
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call sc_puts
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movw $44, %cx
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movw $16, %dx
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call sc_goto
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movw $msg_usage9, %di
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call sc_puts
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movw $44, %cx
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movw $17, %dx
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call sc_goto
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movw $msg_usage10, %di
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call sc_puts
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movw $44, %cx
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movw $18, %dx
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call sc_goto
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movw $msg_usage11, %di
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call sc_puts
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movw $44, %cx
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movw $19, %dx
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call sc_goto
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movw $msg_usage12, %di
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call sc_puts
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ret
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#
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# Display device list
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#
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showdevices:
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movw $2, %cx
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movw $4, %dx
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call sc_goto
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movw $msg_device, %di
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call sc_puts
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xorw %si, %si # %si = device number
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movw ndevice, %cx # %cx = number of devices
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showdev_loop:
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push %cx
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movw $2, %cx
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movw $5, %dx
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addw %si, %dx
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call sc_goto
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# Check DA
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movb daua(%si), %al
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push %ax
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andb $0xf0, %al
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cmpb $0x80, %al
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je show_sasi
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cmpb $0xa0, %al
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je show_scsi
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# unknown device
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movw $msg_unknown, %di
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call sc_puts
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jmp showunit
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# SASI
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show_sasi:
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movw $msg_sasi, %di
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call sc_puts
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jmp showunit
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# SCSI
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show_scsi:
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movw $msg_scsi, %di
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call sc_puts
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# Display unit number.
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showunit:
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pop %ax
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andb $0x0f, %al
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addb $'0', %al
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call sc_putc
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incw %si
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pop %cx
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loop showdev_loop
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movw ndevice, %dx
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addw $5, %dx
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movw $2, %cx
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call sc_goto
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movw $msg_exitmenu, %di
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call sc_puts
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ret
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.data
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.global curdevice, ndevice
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ndevice: .word 0 # number of device
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curdevice: .word 0 # current device
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.global ishireso
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ishireso: .byte 0
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title: .asciz "PC98 Boot Selector Version 1.2"
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copyright: .ascii "(C)Copyright 1999-2007 KATO Takenori. "
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.asciz "All rights reserved."
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msg_device: .asciz "Device"
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msg_sasi: .asciz "SASI/IDE unit "
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msg_scsi: .asciz "SCSI ID "
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msg_unknown: .asciz "unknown unit "
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msg_exitmenu: .asciz "Exit this menu"
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msg_usage1: .asciz "Device list"
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msg_usage2: .asciz "UP, DOWN: select boot device"
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msg_usage3: .asciz "RETURN: move to slice list"
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msg_usage4: .asciz "Slice list"
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msg_usage5: .asciz "UP, DOWN: select boot slice"
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msg_usage6: .asciz "RETURN: boot"
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msg_usage7: .asciz "SPACE: toggle default"
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msg_usage8: .asciz "ESC: move to device list"
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msg_usage9: .asciz "LEGEND"
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msg_usage10: .asciz ">>: selected device/slice"
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msg_usage11: .asciz "*: default slice to boot"
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msg_usage12: .asciz "!: unbootable slice"
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.bss
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.global daua, secsize, defflagoff, defpartoff
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.global maxpart, partoff
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daua: .space 12 # DA/DU list
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secsize: .space 12 * 2 # Sector soize
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defflagoff: .space 12 * 2
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defpartoff: .space 12 * 2
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maxpart: .space 12 * 2
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partoff: .space 12 * 2
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