asyncque.asm

虚拟光驱的驱动程序源代码

.386p

.xlist
	
	include vmm.inc
	include blockdev.inc
	include ior.inc
	include	iop.inc
	include dcb.inc

MASM=1

	include ifs.inc
	include ifsmgr.inc	
	include ilb.inc

	include debug.inc
	include med.inc		; required for iodebug.inc
;	include iodebug.inc     ; various IOS assertions (like AssertIOP)
	
.list

memcpy	proto C, pd:ptr, ps:ptr, size_t:DWORD

VXD_LOCKED_DATA_SEG

extrn	milb:DWORD

public	hFile
	hFile	dw	0


VXD_LOCKED_DATA_ENDS

;;;;;;;;;;;;;;;;;;;

VXD_LOCKED_CODE_SEG

	OnCDRomIOCtl proto stdcall, IOR_ptr:DWORD

;;;==========================================

PAGE
SUBTTL OnAsyncRequest

BeginProc   OnAsyncRequest,esp
ArgVar		IOP_ptr, DWORD

	TRAP
	EnterProc
	
	mov		ebx, IOP_ptr
;	AssertIOP <ebx>

.ERRNZ	IOR_READ - 0
.ERRNZ	IOR_WRITE - 1
.ERRNZ	IOR_VERIFY - 2
.ERRNZ	IOR_MEDIA_CHECK_RESET - 06H

	mov		[ebx].IOP_ior.IOR_status, IORS_SUCCESS

	mov		eax, DCB_DEV_IO_ACTIVE
	or		[ebx].IOP_physical_dcb.DCB_device_flags, eax
	
	movzx		eax, [ebx].IOP_ior.IOR_func
	cmp		eax, IOR_FORMAT
	ja		On_Call_Down
	
	cmp		eax, IOR_READ
	je		Read_cd
		
	cmp		eax, IOR_MEDIA_CHECK_RESET
	je		Media_check	

	cmp		eax, IOR_GEN_IOCTL
	je		Gen_IOctl

	cmp		eax, IOR_COMPUTE_GEOM
	je		Compute_geom

On_Call_Down:
	
	mov		eax, DCB_DEV_IO_ACTIVE
	xor		[ebx].IOP_physical_dcb.DCB_device_flags, eax

	cmp		[ebx].IOP_ior.IOR_func, IOR_RESTART_QUEUE
	jne		@F
	mov		[ebx].IOP_ior.IOR_status, IORS_SUCCESS
	jmp		Callback_next
		
@@:
	mov		[ebx].IOP_ior.IOR_status, IORS_INVALID_COMMAND

On_Call_Back:
	
	mov		eax, DCB_DEV_IO_ACTIVE
	xor		[ebx].IOP_physical_dcb.DCB_device_flags, eax

Callback_next:

	mov		eax, [ebx].IOP_callback_ptr
	sub		eax, size IOP_callback_entry
	mov		[ebx].IOP_callback_ptr, eax
	
	push		ebx
	call    		dword ptr [eax]  
	add		esp, 4
	
	LeaveProc	; deallocute local variable
	Return

Media_check:

	mov		[ebx].IOP_ior.IOR_status, IORS_NOT_READY
	jmp		On_Call_Back

Read_cd:

	cmp		[ebx].IOP_ior.IOR_start_addr, 10h
	jb		invalid_sector

	movzx		eax, hFile
	Test		eax, eax
	jnz		@F
;	call 		OpenImgFile  // 用于打开镜像文件的 OpenImgFile 函数未建立。
;				         可以通过呼叫 0 级文件系统建立。
	test		ax,ax
	jz		@F
@@:
	mov		[ebx].IOP_ior.IOR_status, IORS_NO_MEDIA
	jmp		On_Call_Back

invalid_sector:

	mov		[ebx].IOP_ior.IOR_status, IORS_INVALID_SECTOR
	jmp		On_Call_Back

Gen_IOctl:

	invoke		OnCDRomIOCtl, addr [ebx.IOP_ior]

	jmp		On_Call_Back

Compute_geom:
	mov		[ebx].IOP_ior.IOR_status, IORS_SUCCESS
	jmp		On_Call_Back

EndProc	OnAsyncRequest

VXD_LOCKED_CODE_ENDS

end