diff options
Diffstat (limited to 'private/mvdm/vdd/samples/hpscan/hpscan16.asm')
| -rw-r--r-- | private/mvdm/vdd/samples/hpscan/hpscan16.asm | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/private/mvdm/vdd/samples/hpscan/hpscan16.asm b/private/mvdm/vdd/samples/hpscan/hpscan16.asm new file mode 100644 index 000000000..5e121e969 --- /dev/null +++ b/private/mvdm/vdd/samples/hpscan/hpscan16.asm @@ -0,0 +1,138 @@ +.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 +
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