www.pudn.com > Microsoft Windows驱动程序模型设计 源代码.zip > DEVCTRL.ASM

;   DevCtrl.asm -- Device control procedure for WDMSTUB.VXD 
;	Copyright (C) 1997 by Walter Oney 
;	All rights reserved 
 
	.586p 
	include vmm.inc 
	include debug.inc 
	include version.inc 
 
VxD_LOCKED_DATA_SEG 
didinit  dd    0 
VxD_LOCKED_DATA_ENDS 
 
_init segment dword public flat 'icode' 
beginit  dd    0 
_init ends 
 
_einit  segment dword public flat 'icode' 
endinit  dd    0 
_einit  ends 
 
_bss	 segment dword public flat 'lcode' 
startbss dd    0 
_bss	 ends 
 
_ebss	 segment dword public flat 'lcode' 
endbss	 dd    0 
_ebss ends 
 
Declare_Virtual_Device WDMSTUB, VERMAJOR, VERMINOR, WDMSTUB_control,\ 
	Undefined_Device_ID, ,\ 
	, \ 
	, \ 
 
;------------------------------------------------------------------------------ 
;    Control function: 
;------------------------------------------------------------------------------ 
 
Begin_Control_Dispatch WDMSTUB 
	 bts   didinit, 0				; been here before? 
	 jc    skipinit					; if yes, skip initialization 
	 pushad							; save all registers 
 
	 cld							; force forward direction 
	 mov   edi, offset32 startbss	; point to start of BSS area 
	 mov   ecx, offset32 endbss		; compute length 
	 sub   ecx, edi					; .. 
	 shr   ecx, 2					; convert to dwords 
	 xor   eax, eax					; get const zero 
	 rep   stosd					; zero-fill BSS area 
 
	 mov   esi, offset32 beginit+4	; point to 1st initializer ptr 
@@: 
	 cmp   esi, offset32 endinit	; reached end of initializers? 
	 jae   @F						; if yes, leave the loop 
	 call  dword ptr [esi]			; call static initializer 
	 add   esi, 4					; process all of them 
	 jmp   @B						;   .. 
@@:											 
 
	 popad							; restore registers 
 
skipinit: 
 
Control_Dispatch Device_Init, _OnDeviceInit, cCall,  
 
End_Control_Dispatch WDMSTUB 
 
	end