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Magnum One
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pdriver5.arc
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PKTCHK.ASM
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Assembly Source File
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1989-12-17
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7KB
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344 lines
; Russell Nelson, Clarkson University. October 20, 1988
; Copyright, 1988, 1989, Russell Nelson
; Modified TERMIN.ASM to be CHKPKT.ASM return errorlevel, don't terminate
; 07/24/89 Glen Marianko, Albert Einstein College of Medicine
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, version 1.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
segmoffs struc
offs dw ?
segm dw ?
segmoffs ends
HT equ 09h
CR equ 0dh
LF equ 0ah
code segment byte public
assume cs:code, ds:code
org 80h
phd_dioa label byte
org 100h
start:
jmp start_1
their_isr dd ?
packet_int_no db 0,0
db 0,0 ; filler for print_number
packet_int_end db 0,0
signature db 'PKT DRVR',0
signature_len equ $-signature
got_int db 0
no_signature_msg db "Packet driver not found.",CR,LF,'$'
signature_msg db "Packet driver found at ",'$'
no_signatures_msg db "No packet driver found in specified range.",CR,LF,'$'
usage_msg db "usage: chkpkt <packet_int_no> (packet_int_no_end)",CR,LF,'$'
usage_error:
mov dx,offset usage_msg
error:
mov ah,9
int 21h
err_quit:
mov al,1
mov ah,04ch ; exit with errorlevel 1
int 21h
start_1:
mov si,offset phd_dioa+1
call skip_blanks
cmp al,CR ;end of line?
je usage_error
mov di,offset packet_int_no
call get_number
cmp packet_int_no+1,0
jne usage_error
mov di,offset packet_int_end
call get_number
cmp packet_int_end+1,0
jne usage_error
mov di,si
call skip_blanks
cmp al,CR ;end of line?
jne usage_error
cmp packet_int_end,0
jne chk_range ; second arg specified
call chk_int
jne no_signature_err
call pkt_found
done:
mov al,0
mov ah,04ch
int 21h ; exit with errorlevel 0
no_signature_err:
mov dx,offset no_signature_msg
jmp error
chk_range:
mov al,packet_int_end
sub al,packet_int_no
jc usage_error
chk_loop:
call chk_int
jne chk_none
call pkt_found
inc got_int ; flag we got one
chk_none:
mov al,packet_int_no
cmp packet_int_end,al
jz no_signatures_chk
inc packet_int_no ; increment
jmp chk_loop
no_signatures_chk:
cmp got_int,0
jnz done
no_signatures:
mov dx,offset no_signatures_msg
jmp error
public chk_int
chk_int:
mov ah,35h ;get their packet interrupt.
mov al,packet_int_no
int 21h
mov their_isr.offs,bx
mov their_isr.segm,es
lea di,3[bx]
mov si,offset signature
mov cx,signature_len
repe cmpsb
ret
public pkt_found
pkt_found:
mov dx,offset signature_msg
mov di,offset packet_int_no
jmp print_number
public get_number
get_number:
mov bp,10 ;we default to 10.
jmp short get_number_0
public get_hex
get_hex:
mov bp,16
;get a hex number from [si], skipping leading blanks.
;return cy if there are no digits at all.
;return nc, bx:cx = number, and store cx at [di]
get_number_0:
call skip_blanks
call get_digit ;is there really a number here?
jc get_number_3
or al,al ;Does the number begin with zero?
jne get_number_4 ;no.
mov bp,8 ;yes - they want octal.
get_number_4:
xor cx,cx ;get a hex number.
xor bx,bx
get_number_1:
lodsb
cmp al,'x' ;did they really want hex?
je get_number_5 ;yes.
cmp al,'X' ;did they really want hex?
je get_number_5 ;yes.
call get_digit ;convert a character into an int.
jc get_number_2 ;not a digit (neither hex nor dec).
xor ah,ah
cmp ax,bp ;larger than our base?
jae get_number_2 ;yes.
push ax ;save the new digit.
mov ax,bp ;multiply the low word by ten.
mul cx
mov cx,ax ;keep the low word.
push dx ;save the high word for later.
mov ax,bp
mul bx
mov bx,ax ;we keep only the low word (which is our high word)
pop dx
add bx,ax ;add the high result from earlier.
pop ax ;get the new digit back.
add cx,ax ;add the new digit in.
adc bx,0
jmp get_number_1
get_number_5:
mov bp,16 ;change the base to hex.
jmp get_number_1
get_number_2:
dec si
mov [di],cx ;store the parsed number.
clc
ret
get_number_3:
stc
ret
public skip_blanks
skip_blanks:
lodsb ;skip blanks.
cmp al,' '
je skip_blanks
cmp al,HT
je skip_blanks
dec si
ret
get_digit:
;enter with al = character
;return nc, al=digit, or cy if not a digit.
cmp al,'0' ;decimal digit?
jb get_digit_1 ;no.
cmp al,'9' ;. .?
ja get_digit_2 ;no.
sub al,'0'
clc
ret
get_digit_2:
or al,20h
cmp al,'a' ;hex digit?
jb get_digit_1
cmp al,'f' ;hex digit?
ja get_digit_1
sub al,'a'-10
clc
ret
get_digit_1:
stc
ret
print_number:
;enter with dx -> dollar terminated name of number, di ->dword.
;exit with the number printed and the cursor advanced to the next line.
mov ah,9 ;print the name of the number.
int 21h
mov al,'0'
call chrout
mov al,'x'
call chrout
mov ax,[di] ;print the number in hex.
mov dx,[di+2]
call hexout
mov al,' '
call chrout
mov al,'('
call chrout
mov ax,[di] ;print the number in decimal.
mov dx,[di+2]
call decout
mov al,')'
call chrout
mov al,CR
call chrout
mov al,LF
call chrout
ret
public hexout
hexout:
mov cl,'0' ;prepare to eliminate leading zeroes.
xchg ax,dx ;just output 32 bits in hex.
call wordout ;output dx.
xchg ax,dx
jmp wordout ;output ax.
public decout
decout:
mov si,ax ;get the number where we want it.
mov di,dx
xor ax,ax ;start with all zeroes in al,bx,bp
mov bx,ax
mov bp,ax
mov cx,32 ;32 bits in two 16 bit registers.
decout_1:
shl si,1
rcl di,1
xchg bp,ax
call addbit
xchg bp,ax
xchg bx,ax
call addbit
xchg bx,ax
adc al,al
daa
loop decout_1
mov cl,'0' ;prepare to eliminate leading zeroes.
call byteout ;output the first two.
mov ax,bx ;output the next four
call wordout ;output the next four
mov ax,bp
wordout:
push ax
mov al,ah
call byteout
pop ax
byteout:
mov ah,al
shr al,1
shr al,1
shr al,1
shr al,1
call digout
mov al,ah
digout:
and al,0fh
add al,90h ;binary digit to ascii hex digit.
daa
adc al,40h
daa
cmp al,cl ;leading zero?
je return
mov cl,-1 ;no more leading zeros.
chrout:
push ax ;print the char in al.
xchg al,dl
mov ah,2
int 21h
xchg al,dl
pop ax
return:
ret
addbit: adc al,al
daa
xchg al,ah
adc al,al
daa
xchg al,ah
ret
code ends
end start