mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
123 lines
3.1 KiB
ArmAsm
123 lines
3.1 KiB
ArmAsm
! Copyright (c) 1997 Helmut Wirth <hfwirth@ping.at>
|
|
! All rights reserved.
|
|
!
|
|
! 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 immediately at the beginning of the file, witout modification,
|
|
! this list of conditions, and the following disclaimer.
|
|
! 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.
|
|
! 3. The name of the author may not be used to endorse or promote products
|
|
! derived from this software without specific prior written permission.
|
|
!
|
|
! 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.
|
|
!
|
|
! $FreeBSD$
|
|
|
|
|
|
!
|
|
! This is the new redirector program, it replaces instbsdi.exe
|
|
! The program fetches some pointers from DOS and reports them back to
|
|
! the emulator via the emulator interrupt 0xff. It does not stay resident.
|
|
|
|
use16
|
|
|
|
.text
|
|
.bss
|
|
.data
|
|
.align 0
|
|
|
|
! Emulator interrupt entry
|
|
EmulatorINT = 0xFF
|
|
! Emulator redirector function
|
|
EmulatorRED = 0x1
|
|
|
|
! DOS interrupt
|
|
DOSInt = 0x21
|
|
|
|
! DOS get list of lists call, returns pointer to system vars in ES:BX
|
|
DOSGetList = 0x52
|
|
|
|
! DOS get swappable area, returns DOS swappable area in DS:SI
|
|
DOSGetSwapD = 0x5D06
|
|
|
|
! DOS terminate program with return code
|
|
DOSExit = 0x4C
|
|
|
|
! DOS print message
|
|
DOSMesg = 0x9
|
|
|
|
cr = 0xd
|
|
lf = 0xa
|
|
eom = '$' ! DOS end of string
|
|
|
|
.org 0x100
|
|
|
|
.globl _main
|
|
_main:
|
|
|
|
mov ah, #DOSGetList
|
|
int DOSInt
|
|
jc Fail
|
|
mov [_list], bx
|
|
mov ax, es
|
|
mov [_list+2], ax
|
|
push ds
|
|
mov ax, #DOSGetSwapD
|
|
int DOSInt
|
|
mov ax, ds
|
|
pop ds
|
|
jc Fail
|
|
mov [_swap], si
|
|
mov [_swap+2], ax
|
|
push ax
|
|
mov ah, #EmulatorRED
|
|
mov dx, [_list]
|
|
mov bx, [_list+2]
|
|
mov si, [_swap]
|
|
mov di, [_swap+2]
|
|
int EmulatorINT
|
|
xor al, al ! return 0
|
|
jmp Exit
|
|
Fail:
|
|
mov ah, #DOSMesg
|
|
mov dx, #ErrorMessage
|
|
int DOSInt
|
|
mov al, #1 ! return 1
|
|
Exit:
|
|
mov ah, #DOSExit
|
|
int DOSInt
|
|
!
|
|
! Should never get to this point
|
|
!
|
|
nop
|
|
nop
|
|
hlt
|
|
|
|
! The two pointers are found using the DOS calls
|
|
! and passed to the redirector interface via int FF
|
|
! The two pointers are passed in BX:DX (list) and DI:SI (swap)
|
|
|
|
.align 2
|
|
|
|
_list: .word 0
|
|
.word 0
|
|
_swap: .word 0
|
|
.word 0
|
|
|
|
ErrorMessage:
|
|
.ascii "Error installing redirector interface"
|
|
.byte cr,lf,eom, 0
|