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123 lines
3.1 KiB
ArmAsm
123 lines
3.1 KiB
ArmAsm
! Copyright (c) 1997 Helmut Wirth <hfwirth@ping.at>
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! All rights reserved.
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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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! 1. Redistributions of source code must retain the above copyright
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! notice immediately at the beginning of the file, witout modification,
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! this list of conditions, and the following disclaimer.
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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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! 3. The name of the author may not be used to endorse or promote products
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! derived from this software without specific prior written permission.
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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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! This is the new redirector program, it replaces instbsdi.exe
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! The program fetches some pointers from DOS and reports them back to
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! the emulator via the emulator interrupt 0xff. It does not stay resident.
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use16
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.text
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.bss
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.data
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.align 0
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! Emulator interrupt entry
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EmulatorINT = 0xFF
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! Emulator redirector function
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EmulatorRED = 0x1
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! DOS interrupt
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DOSInt = 0x21
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! DOS get list of lists call, returns pointer to system vars in ES:BX
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DOSGetList = 0x52
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! DOS get swappable area, returns DOS swappable area in DS:SI
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DOSGetSwapD = 0x5D06
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! DOS terminate program with return code
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DOSExit = 0x4C
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! DOS print message
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DOSMesg = 0x9
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cr = 0xd
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lf = 0xa
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eom = '$' ! DOS end of string
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.org 0x100
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.globl _main
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_main:
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mov ah, #DOSGetList
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int DOSInt
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jc Fail
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mov [_list], bx
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mov ax, es
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mov [_list+2], ax
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push ds
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mov ax, #DOSGetSwapD
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int DOSInt
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mov ax, ds
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pop ds
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jc Fail
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mov [_swap], si
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mov [_swap+2], ax
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push ax
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mov ah, #EmulatorRED
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mov dx, [_list]
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mov bx, [_list+2]
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mov si, [_swap]
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mov di, [_swap+2]
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int EmulatorINT
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xor al, al ! return 0
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jmp Exit
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Fail:
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mov ah, #DOSMesg
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mov dx, #ErrorMessage
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int DOSInt
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mov al, #1 ! return 1
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Exit:
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mov ah, #DOSExit
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int DOSInt
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!
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! Should never get to this point
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!
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nop
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nop
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hlt
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! The two pointers are found using the DOS calls
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! and passed to the redirector interface via int FF
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! The two pointers are passed in BX:DX (list) and DI:SI (swap)
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.align 2
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_list: .word 0
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.word 0
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_swap: .word 0
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.word 0
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ErrorMessage:
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.ascii "Error installing redirector interface"
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.byte cr,lf,eom, 0
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