mirror of
https://github.com/86Box/probing-tools.git
synced 2026-02-21 17:15:34 -07:00
173 lines
2.6 KiB
NASM
173 lines
2.6 KiB
NASM
;
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; 86Box A hypervisor and IBM PC system emulator that specializes in
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; running old operating systems and software designed for IBM
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; PC systems and compatibles from 1981 through fairly recent
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; system designs based on the PCI bus.
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;
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; This file is part of the 86Box Probing Tools distribution.
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;
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; VIA VT82C42N keyboard controller probing tool.
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;
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;
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;
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; Authors: Miran Grca, <mgrca8@gmail.com>
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;
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; Copyright 2021 Miran Grca.
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;
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.model tiny
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.286
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.code
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start:
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jmp real_start
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wait_for_nibf:
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push ax
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mov cx,0010h
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nibf_push_cx:
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push cx
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xor cx,cx
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nibf_in:
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in al,64h
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test al,2
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loopne nibf_in
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pop cx
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loopne nibf_push_cx
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pop ax
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ret
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wait_for_obf:
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push ax
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mov cx,0010h
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obf_push_cx:
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push cx
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xor cx,cx
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obf_in:
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in al,64h
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test al,1
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loope obf_in
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pop cx
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loope obf_push_cx
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pop ax
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ret
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print_string:
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mov ah,9
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int 21h
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ret
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convert_digit:
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and al,0fh
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add al,30h
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cmp al,39h
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ja short digit_is_letter
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jmp short output_digit
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digit_is_letter:
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add al,7
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output_digit:
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mov [si],al
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inc si
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ret
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convert_to_hex:
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push ax
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push ax
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shr al,4
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call convert_digit
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pop ax
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call convert_digit
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pop ax
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ret
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viakey_test:
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xor dx,dx
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mov al,0afh
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out 64h,al
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call wait_for_nibf
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jnz short gcv_stuck
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call wait_for_obf
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jz short not_viakey
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in al,60h
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mov si,offset ver
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call convert_to_hex
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mov byte [erl],0
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jmp short viakey_ret
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not_viakey:
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mov byte [erl],3
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jmp short viakey_ret
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gcv_stuck:
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mov byte [erl],2
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viakey_ret:
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ret
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disable_kbd:
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mov al,0adh
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out 64h,al
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call wait_for_nibf
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jz short dkbd_ret
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mov byte [erl],1
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dkbd_ret:
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ret
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enable_kbd:
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mov al,0aeh
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out 64h,al
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call wait_for_nibf
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jz short ekbd_ret
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mov byte [erl],4
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ekbd_ret:
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ret
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print_out:
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mov si,[erl]
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shl si,1
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add si,offset strs
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mov dx,[si]
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call print_string
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ret
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new_cmd db 57h
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saved_cmd
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db 0
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erl dw 0
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strs dw offset succ,offset err_1,offset err_2,offset err_3,offset err_4
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succ db "VIA VT82C42N detected: "
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ver db "0",0dh,0ah
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copr dup 512, 0
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db 0dh,0ah,'$'
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err_1 db "Disable Keyboard command stuck",0dh,0ah,'$'
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err_2 db "Get Controller Version command stuck",0dh,0ah,'$'
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err_3 db "VIA VT82C42N not detected",0dh,0ah,'$'
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err_4 db "Enable Keyboard command stuck",0dh,0ah,'$'
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;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
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;
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; External Entry Point
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;
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;ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ
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real_start:
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; First round of tests
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cli
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call disable_kbd
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cmp byte [erl],0
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jnz short stop_tests
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call viakey_test
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cmp byte [erl],0
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jnz short stop_tests
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stop_tests:
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call enable_kbd
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sti
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call print_out
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mov al,[erl]
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cmp al,0
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mov ah,4ch
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int 21h
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.end start
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end
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