home *** CD-ROM | disk | FTP | other *** search
- ; Russell Nelson, Clarkson University. September 14, 1989
- ; Copyright, 1989, Russell Nelson
-
- ; 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.
-
- include defs.asm
-
- 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 ?,?
- ether_bdcst db EADDR_LEN dup(-1) ;ethernet broadcast address.
- ether_addr db EADDR_LEN dup(-1)
- ether_byte db ?,?
-
- handle dw ?
-
- bogus_type db 1,2,3,4,5,6,7,8 ;totally bogus type code.
-
- signature db 'PKT DRVR',0
- signature_len equ $-signature
- no_signature_msg db "No packet driver at that address",'$'
- usage_msg db "usage: pktaddr <packet_int_no> [<addr>]",'$'
- cant_set_msg db "Can't set our Ethernet address",'$'
- bad_addr_msg db "Bad address error",'$'
- bad_error_msg db "Unknown error",'$'
-
- eaddr_msg db "My Ethernet address is ",'$'
- crlf_msg db CR,LF,'$'
-
- usage_error:
- mov dx,offset usage_msg
- error:
- mov ah,9
- int 21h
- int 20h
-
- start_1:
- mov si,offset phd_dioa+1
- cmp byte ptr [si],CR ;end of line?
- je usage_error
-
- mov di,offset packet_int_no
- call get_number
- mov cx,EADDR_LEN
- mov di,offset ether_addr
- start_2:
- push cx
- push di
- mov di,offset ether_byte
- call get_hex
- mov al,cl ;remember the number in al.
- pop di
- pop cx
- jc start_3 ;exit if no number at all.
- stosb ;store a byte.
- cmp byte ptr [si],':' ;skip colons between bytes.
- jne start_4
- inc si
- start_4:
- loop start_2
- start_3:
-
- 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
- je have_signature
- mov dx,offset no_signature_msg
- jmp error
- have_signature:
-
- push ds
- pop es
- mov cx,EADDR_LEN
- mov si,offset ether_addr
- mov di,offset ether_bdcst
- repe cmpsb
- je get_mode ;no address specified.
-
- mov ah,25 ;set the ethernet address.
- mov di,offset ether_addr
- mov cx,EADDR_LEN
- pushf
- cli
- call their_isr
- jc bad
- jmp okay
- get_mode:
- mov ah,2 ;access all packets.
- mov al,1 ;Ethernet class.
- mov bx,-1 ;generic type.
- mov dl,0 ;generic number.
- mov cx,MAX_P_LEN ;use the max type length.
- mov si,offset bogus_type
- push cs ;es:di -> our receiver.
- pop es
- mov di,offset our_recv
- pushf
- cli
- call their_isr
- jc bad
- mov handle,ax
-
- mov ah,6 ;get the ethernet address.
- mov di,offset ether_addr
- mov cx,EADDR_LEN
- mov bx,handle
- pushf
- cli
- call their_isr
- jc bad
-
- mov dx,offset eaddr_msg
- mov ah,9
- int 21h
-
- mov cx,EADDR_LEN
- mov si,offset ether_addr
- print_addr:
- push cx
- lodsb
- mov cl,' ' ;Don't eliminate leading zeroes.
- call byteout
- pop cx
- cmp cx,1
- je print_addr_1
- mov al,':'
- call chrout
- print_addr_1:
- loop print_addr
-
- mov dx,offset crlf_msg ;can't depend on DOS to newline for us.
- mov ah,9
- int 21h
-
- mov ah,3 ;release_type
- mov bx,handle
- pushf
- cli
- call their_isr
- jc bad
-
- jmp short okay
-
- bad:
- cmp dh,CANT_SET
- jne bad_1
- mov dx,offset cant_set_msg
- jmp error
- bad_1:
- cmp dh,BAD_ADDRESS
- jne bad_2
- mov dx,offset bad_addr_msg
- jmp error
- bad_2:
- mov dx,offset bad_error_msg
- jmp error
- okay:
- int 20h
-
-
- our_recv:
- or ax,ax ;first or second call?
- jne our_recv_1 ;second -- we ignore the packet
- push cs
- pop es
- mov di,offset our_buffer
- our_recv_1:
- retf
-
-
- 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
-
- 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
-
- our_buffer label byte
-
- code ends
-
- end start
-