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|
.MODEL small
;*************************************************
; Filename: hpscan16.asm
; Purpose: Stub DOS Device Driver. Pass device
; "HPSCAN" requests to the VDD, hpscan32.dll.
; Environment: MSDOS, Windows NT.
; (C) Hewlett-Packard Company 1993.
;*************************************************
INCLUDE hpscan16.inc ;private
INCLUDE isvbop.inc ;NT DDK
SUBTTL Segment and data definitions
ASSUME CS:CSEG,DS:NOTHING,ES:NOTHING
CSEG SEGMENT
;-------------------------------------------------
; Resident data area - variables needed after init
;-------------------------------------------------
;**--- Device Header, must be at offset zero ---**
SCAN_HEADER:
dd -1 ;becomes ptr to next req hdr
dw 0C000H ;character, supports IOCTL
dw offset STRAT ;Strategy routine
dw offset IDVR ;Interrupt routine
DH_NAME db 'HPSCAN ' ;char device name
;**---- Request Header addr, saved by STRAT ----**
RH_PTRA LABEL DWORD
RH_PTRO dw ? ;offset
RH_PTRS dw ? ;segment
;**------------- Define Stack Space ------------**
STK_SEG dw ? ;Save original stack segment
STK_PTR dw ? ;Save original stack pointer
STACK dw 200 DUP (0) ;Local stack
TOP_STK dw ? ;Top of local stack
;**--------------- VDD information -------------**
VDD_DllName db "HPSCAN32.DLL", 0
VDD_InitFunc db "VDDInit", 0
VDD_DispFunc db "VDDDispatch", 0
VDD_hVDD dw ?
;**-------------- Copyright Info ---------------**
db '(C) Copyright Hewlett-Packard Company 1993.'
db 'All rights reserved.'
SUBTTL Device Strategy & Interrupt entry points
;**--------------- STRAT routine ---------------**
STRAT proc far ;Strategy routine
mov cs:RH_PTRO,bx ;save offset address
mov cs:RH_PTRS,es ;save segment address
ret ;end Strategy routine
STRAT endp
;**--------------- IDVR routine ---------------**
IDVR proc far ;Interrupt routine
push ds ;save all modified registers
push es ;DOS has stack for 20 pushes
push ax
push bx
push cx
push dx
push di
push si
push bp
mov cs:STK_PTR,sp ;save original stack ptr
mov cs:STK_SEG,ss ;save original stack seg
cli ;disable for stack ops
mov ax,cs ;setup new stack ptr
mov ss,ax ;setup new stack seg
mov sp,offset TOP_STK
sti ;restore flags back
cld ;all moves are forward
les bx,cs:RH_PTRA ;load req hdr adr in es:bx
mov al,RH.RHC_CMD
cmp al,0 ;check for init command
je BOOTUP ;command 0 = init
xor dx,dx ;some other command
mov dl,RH.RHC_CMD ;dx = command code
mov cx,RH.RHC_CNT ;cx = count
mov ax,RH.RHC_SEG ;es:bx = addr of data
mov bx,RH.RHC_OFF
mov es,ax ;finally, load VDD handle
mov ax,word ptr cs:[VDD_hVDD]
DispatchCall ;call Dispatch in VDD
;returns with status in di
EXIT:
les bx,cs:RH_PTRA ;restore ES:BX
or di,STAT_DONE ;add "DONE" bit to status
mov RH.RHC_STA,di ;save status in requ hdr
cli ;disable ints for stack op
mov ss,cs:STK_SEG ;restore stack seg
mov sp,cs:STK_PTR ;restore stack ptr
sti ;re-enable interrupts
pop bp ;restore registers
pop si
pop di
pop dx
pop cx
pop bx
pop ax
pop es
pop ds
ret ;far return
IDVR endp
;**--------- jump here for Init Command --------**
BOOTUP:
mov ax,offset EndDriver
mov RH.RHC_OFF,ax ;address of end of driver
mov RH.RHC_SEG,CS ;reference from code seg
mov si,offset VDD_DllName ;load regs for VDD
mov di,offset VDD_InitFunc
mov bx,offset VDD_DispFunc
mov ax,ds
mov es,ax
RegisterModule ;calls the VDD
jnc save_hVDD ;if NC then success
mov di,STAT_GF ;set failure status
jmp EXIT ;return via common exit
save_hVDD:
mov [VDD_hVDD],ax ;save handle in ax
mov di,STAT_OK ;load OK status
jmp EXIT ;return via common exit
EndDriver db ?
CSEG ENDS
END SCAN_HEADER ;REQUIRED BY EXE2BIN
|
