; Programm: addev.asm
; Funktion: Einbinden von Gerätetreibern
; ohne Benutzung der config.sys
; Sprache : MASM ab 4.0, TASM
; Quelle : DOS 9/91 S.266ff }
;
; Assemblieren mit:
; MASM TASM
; masm addev,,,; tasm addev,,,;
; link addev; tlink addev /t
; exe2bin addev addev.com
code segment byte
assume cs:code,ds:code
assume es:code,ss:code
org 100h
start: jmp init
; Pseudostapel
dw 0020h dup (?)
stack_: dw ?
; Daten- und Variablenbereich
msg1 db 10,13
db 'AddDev V1.0 (c) DOS '
db 'international 9/91 ',10,13
db 10,'$'
msg2 db 'Treiber nicht installiert.$'
msg3 db 'Treiber installiert.$'
msg4 db 'Falsche DOS-Version.$'
dibseg dw ?
dibofs dw ?
blkdevadr dw ?
lastdrvadr dw ?
nuldevadr dw ?
cdsbase dw ?
cdssize dw ?
parblock dw ?,?
intvekseg dw ?
databk db 11h,-1,00h,0fh dup (00h)
dw offset filename,?,?
call1 dw ?,?
call2 dw ?,?
lastadr dw ?,?
regds dw ?
reges dw ?
regss dw ?
endadr dw ?
dosver db ?
cdsptr dw ?,?
filename db 128 dup (-1)
anzblkdev db ?
unit db ?
intadr dw ?
; Treiber laden und installieren
loaddrv proc near
push cs
pop es
cld
mov si,0080h
lodsb
; Dateiname des Treibers holen
or al,al
jz error
call ignspc
jc error
mov di,offset filename
getfile: lodsb
cmp al,20h
jz fileok
cmp al,0dh
jz fileok
stosb
jmp short getfile
fileok: dec si
xor al,al
stosb
push di
call ignspc
jc paramsok
; Treiberparameter holen
getparams: lodsb
cmp al,0dh
jz paramsok
stosb
jmp short getparams
paramsok: mov al,0dh
stosb
push ds
push es
; Treiber als Overlay laden
mov bx,offset parblock
mov dx,offset filename
mov ax,4b03h
int 21h
pop es
pop ds
jnc loadok
pop di
; bei Auftreten eines Fehlers:
; Speicher freigeben und zum DOS
error: push cs
pop ds
mov ah,09h
mov dx,offset msg2
int 21h
mov es,intvekseg
mov ah,49h
int 21h
mov ax,4c00h
int 21h
loadok: pop di
mov byte ptr [di-1],20h
mov ax,parblock
mov es,ax
; Adressen der Strategie- und
; Interrupt-Routine ermitteln
mov ax,es:[6]
mov call1,ax
mov ax,es:[8]
mov call2,ax
mov si,offset databk
; Parameter-Block vorbereiten
mov [si+14h],cs
mov es,dibseg
mov di,blkdevadr
mov al,es:[di]
mov [si+16h],al
push cs
pop es
mov bx,offset databk
push ds
; Strategieroutine aufrufen
call dword ptr cs:call1
; Interruptroutine aufrufen
call dword ptr cs:call2
; Treiber installieren
pop ds
mov si,offset databk
mov ax,[si+3]
test ah,80h
jz drvinitok
errinit: xor ax,ax
mov es,ax
xor di,di
xor si,si
mov ds,intvekseg
cld
mov cx,0200h
cli
rep movsw
sti
jmp error
drvinitok: les bx,[si+0eh]
mov lastadr,bx
mov lastadr+2,es
add bx,0020h
mov intadr,bx
; Interruptvektoren nach
; Änderungen dursuchen
cli
mov regds,ds
mov reges,es
mov regss,ss
mov ax,es
mov ss,ax
mov dx,bx
inc bx
mov es,intvekseg
xor ax,ax
mov ds,ax
xor si,si
xor di,di
xor cx,cx
chkint: mov ax,[si]
cmp ax,es:[di]
jnz modified
mov ax,[si+2]
cmp ax,es:[di+2]
jz intok
modified: inc ch
mov ss:[bx],cl
mov ax,[si]
mov ss:[bx+1],ax
mov ax,[si+2]
mov ss:[bx+3],ax
mov ax,es:[di]
mov ss:[bx+5],ax
mov ax,es:[di+2]
mov ss:[bx+7],ax
add bx,9
intok: add si,4
add di,4
inc cl
jnz chkint
xchg bx,dx
mov ss:[bx],ch
mov ss,cs:regss
mov es,cs:reges
mov ds,cs:regds
sti
add dx,0020h
mov endadr,dx
mov ax,parblock
mov es,ax
mov ax,es:[4]
test ah,80h
jz blockdev
jmp moddvchan
; Speziealbehandlung für Block-
; treiber durchführen
blockdev: mov es,dibseg
mov bx,blkdevadr
mov ah,es:[bx]
mov anzblkdev,ah
mov cl,databk+0dh
add ah,cl
mov bx,lastdrvadr
cmp ah,es:[bx]
jbe anzdrvok
; Fehler, wenn zu viele Geräte
jmp error
anzdrvok: xor ch,ch
mov unit,00h
patchok: mov bx,cdsbase
mov es,dibseg
les bx,es:[bx]
mov cdsptr,bx
mov cdsptr+2,es
lds si,dword ptr databk+18
mov es,word ptr cs:databk+16
mov bp,cs:endadr
patchloop: push cx
push ds
push si
mov si,[si]
push es
push bp
push es
push bp
; BPB in DPB konvertieren
mov ah,53h
int 21h
pop bp
pop es
push es
push bp
; Gerätebezeichnung und Subunit
; in DPB eintragen
mov al,cs:anzblkdev
mov es:[bp],al
mov al,cs:unit
mov es:[bp+1],al
push bp
cmp cs:dosver,4
jb adrok
inc bp
adrok: mov word ptr es:[bp+12h],0
; Treiberadr. in DPB eintragen
mov ax,cs:parblock
mov es:[bp+14h],ax
mov byte ptr es:[bp+23],-1
mov word ptr es:[bp+24],-1
mov word ptr es:[bp+26],-1
pop bp
cli
mov ss,cs:dibseg
mov bx,cs:dibofs
; letztes DPB suchen und neuen
; DPB in DPB-Liste einfügen
dpbloop: mov dx,ss:[bx]
mov ss,ss:[bx+2]
mov bx,dx
cmp cs:dosver,4
jb adrok1
inc bx
adrok1: add bx,0018h
cmp word ptr ss:[bx],-1
jz lastdpb
jmp short dpbloop
lastdpb: mov ss:[bx],bp
mov ss:[bx+2],es
mov ax,cs
mov ss,ax
sti
; CDS-Eintrag initialisieren
mov al,cs:anzblkdev
xor ah,ah
mov dx,cs:cdssize
mul dx
mov bx,cs:cdsptr
add bx,ax
mov ds,cs:cdsptr+2
mov word ptr [bx+43h],4000h
pop word ptr [bx+45h]
pop word ptr [bx+47h]
mov word ptr [bx+49h],-1
mov word ptr [bx+4bh],-1
mov word ptr [bx+4dh],-1
mov word ptr [bx+4fh],2
cmp cs:dosver,4
jb cdsok
mov byte ptr [bx+51h],0
mov word ptr [bx+52h],0
mov word ptr [bx+54h],0
mov byte ptr [bx+56h],0
cdsok: pop bp
pop es
add bp,0022h
pop si
pop ds
inc cs:anzblkdev
inc cs:unit
add si,02h
pop cx
dec cx
jz endpatch
; fortfahren, wenn Treiber
; mehrere Geräte unterstützt
jmp patchloop
endpatch: push cs
pop ds
mov endadr,bp
mov es,dibseg
mov bx,blkdevadr
; Anz. Geräte in DIB schreiben
mov al,anzblkdev
mov es:[bx],al
moddvchan: mov es,dibseg
mov di,nuldevadr
; Treiber in Treiberliste einf.
push es:[di]
push es:[di+2]
mov bx,parblock
cld
xor ax,ax
stosw
mov ax,bx
stosw
mov ds,bx
pop ds:[2]
pop ds:[0]
push cs
pop ds
; Speicherbereiche freigeben
mov es,intvekseg
mov ah,49h
int 21h
mov ah,09h
mov dx,offset msg3
int 21h
mov dx,endadr
mov cl,04h
shr dx,cl
inc dx
add dx,lastadr+2
mov ax,cs
sub dx,ax
inc dx
mov ax,3100h
int 21h
loaddrv endp
ignspc proc near
; Leerzeichen überlesen
mov al,[si]
cmp al,20h
jz ignore
cmp al,0dh
jz noparams
clc
ret
ignore: inc si
jmp short ignspc
noparams: stc
ret
ignspc endp
; Initialisierung
init proc near
cli
mov ax,cs
mov ds,ax
mov es,ax
mov ss,ax
mov sp,offset stack_
sti
mov ah,09h
mov dx,offset msg1
int 21h
mov es,cs:[002ch]
mov ah,49h
int 21h
mov ah,30h
int 21h
mov dosver,al
cmp al,03h
jae dosvok
jmp baddos
dosvok: push ax
mov ah,52h
int 21h
mov dibseg,es
mov dibofs,bx
pop ax
xchg ah,al
cmp ax,0300h
jz dosv30
cmp ah,03h
jnz dosv4x
dosv3x: push bx
add bx,0020h
mov blkdevadr,bx
inc bx
mov lastdrvadr,bx
inc bx
mov nuldevadr,bx
pop bx
dosv3: add bx,0016h
mov cdsbase,bx
mov cdssize,51h
jmp short initok
dosv30: push bx
add bx,0010h
mov blkdevadr,bx
add bx,000bh
mov lastdrvadr,bx
add bx,000dh
mov nuldevadr,bx
pop bx
jmp short dosv3
dosv4x: push bx
add bx,0020h
mov blkdevadr,bx
inc bx
mov lastdrvadr,bx
inc bx
mov nuldevadr,bx
pop bx
add bx,0016h
mov cdsbase,bx
mov cdssize,58h
initok: push cs
pop es
mov ah,4ah
mov bx,offset init
mov cl,04h
shr bx,cl
inc bx
mov dx,cs
add dx,bx
mov parblock,dx
mov parblock+2,dx
mov call1+2,dx
mov call2+2,dx
push bx
int 21h
mov ah,48h
mov bx,-1
int 21h
sub bx,0400h
pop ax
add bx,ax
mov ah,4ah
int 21h
mov ax,5800h
int 21h
push ax
mov ax,5801h
mov bx,0002h
int 21h
mov ah,48h
mov bx,0040h
int 21h
mov intvekseg,ax
pop bx
mov ax,5801h
int 21h
cld
push ds
push es
mov es,intvekseg
xor ax,ax
mov ds,ax
xor si,si
xor di,di
mov cx,0200h
cli
rep movsw
sti
pop es
pop ds
jmp loaddrv
baddos: mov ah,09h
mov dx,offset msg4
int 21h
mov ax,4c00h
int 21h
init endp
code ends
end start
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