參考資訊：
https://wasm.in/
http://four-f.narod.ru/
https://github.com/steward-fu/ddk
由於I/O Timer的Timer間隔固定為一秒，如果使用者想要可以彈性設定的Timer間隔，則需要使用DPC Timer，使用步驟如下：
1. KeInitializeTimer()
2. KeInitializeDpc()
3. KeSetTimer()
4. KeCancelTimer()
DPC Timer如果使用KeSetTimer()做設定時，其Timer為一次性，也就是Callback僅會被呼叫一次，如果要使用週期性Timer，則需要改用KeSetTimerEx()
BOOLEAN KeSetTimerEx(PKTIMER Timer, LARGE_INTEGER DueTime, LONG Period, PKDPC Dpc);
DueTime是第一次Timer的間隔，之後的間隔則使用Period數值
main.asm
.386p
.model flat, stdcall
option casemap:none
include c:\masm32\include\w2k\ntstatus.inc
include c:\masm32\include\w2k\ntddk.inc
include c:\masm32\include\w2k\ntoskrnl.inc
include c:\masm32\include\w2k\ntddkbd.inc
include c:\masm32\Macros\Strings.mac
includelib c:\masm32\lib\wxp\i386\ntoskrnl.lib
public DriverEntry
MyDeviceExtension struct
dwTimerCnt DWORD ?
stTimerDPC KDPC <>
stTimerObj KTIMER <>
pNextDev PDEVICE_OBJECT ?
MyDeviceExtension ends
IOCTL_START equ CTL_CODE(FILE_DEVICE_UNKNOWN, 800h, METHOD_BUFFERED, FILE_ANY_ACCESS)
IOCTL_STOP equ CTL_CODE(FILE_DEVICE_UNKNOWN, 801h, METHOD_BUFFERED, FILE_ANY_ACCESS)
.const
MSG_START byte "IOCTL_START",0
MSG_STOP byte "IOCTL_STOP",0
.code
OnTimer proc pDpc : PKDPC, pContext : PVOID, pArg1 : PVOID, PArg2 : PVOID
mov eax, pContext
mov eax, (DEVICE_OBJECT ptr [eax]).DeviceExtension
inc (MyDeviceExtension ptr[eax]).dwTimerCnt
invoke DbgPrint, $CTA0("DpcTimer: %d\n"), (MyDeviceExtension ptr[eax]).dwTimerCnt
ret
OnTimer endp
IrpOpenClose proc pMyDevice : PDEVICE_OBJECT, pIrp : PIRP
IoGetCurrentIrpStackLocation pIrp
movzx eax, (IO_STACK_LOCATION ptr [eax]).MajorFunction
.if eax == IRP_MJ_CREATE
invoke DbgPrint, $CTA0("IRP_MJ_CREATE")
.elseif eax == IRP_MJ_CLOSE
invoke DbgPrint, $CTA0("IRP_MJ_CLOSE")
.endif
mov eax, pIrp
and (_IRP ptr [eax]).IoStatus.Information, 0
mov (_IRP ptr [eax]).IoStatus.Status, STATUS_SUCCESS
fastcall IofCompleteRequest, pIrp, IO_NO_INCREMENT
mov eax, STATUS_SUCCESS
ret
IrpOpenClose endp
IrpIOCTL proc uses ebx pMyDevice : PDEVICE_OBJECT, pIrp : PIRP
local pBuf : DWORD
local dwLen : DWORD
local pDevExt : ptr
local hThread : DWORD
local pThread : PVOID
local stTimeCnt : LARGE_INTEGER
and dwLen, 0
mov eax, pMyDevice
push (DEVICE_OBJECT ptr [eax]).DeviceExtension
pop pDevExt
IoGetCurrentIrpStackLocation pIrp
mov eax, (IO_STACK_LOCATION ptr [eax]).Parameters.DeviceIoControl.IoControlCode
.if eax == IOCTL_START
invoke DbgPrint, offset MSG_START
or stTimeCnt.HighPart, -1
mov stTimeCnt.LowPart, -10000000
mov ebx, pDevExt
mov (MyDeviceExtension ptr[ebx]).dwTimerCnt, 0
;invoke KeSetTimer, addr (MyDeviceExtension ptr[ebx]).stTimerObj, stTimeCnt.LowPart, stTimeCnt.HighPart, addr (MyDeviceExtension ptr[ebx]).stTimerDPC
invoke KeSetTimerEx, addr (MyDeviceExtension ptr[ebx]).stTimerObj, stTimeCnt.LowPart, stTimeCnt.HighPart, 1000, addr (MyDeviceExtension ptr[ebx]).stTimerDPC
.elseif eax == IOCTL_STOP
invoke DbgPrint, offset MSG_STOP
mov ebx, pDevExt
invoke KeCancelTimer, addr (MyDeviceExtension ptr[ebx]).stTimerObj
.endif
mov eax, pIrp
mov (_IRP ptr [eax]).IoStatus.Status, STATUS_SUCCESS
push dwLen
pop (_IRP ptr [eax]).IoStatus.Information
fastcall IofCompleteRequest, pIrp, IO_NO_INCREMENT
mov eax, STATUS_SUCCESS
ret
IrpIOCTL endp
IrpPnp proc pMyDevice : PDEVICE_OBJECT, pIrp : PIRP
local pDevExt : ptr
local szSymName : UNICODE_STRING
mov eax, pMyDevice
push (DEVICE_OBJECT ptr [eax]).DeviceExtension
pop pDevExt
IoGetCurrentIrpStackLocation pIrp
movzx eax, (IO_STACK_LOCATION ptr [eax]).MinorFunction
.if eax == IRP_MN_START_DEVICE
mov eax, pIrp
mov (_IRP ptr [eax]).IoStatus.Status, STATUS_SUCCESS
.elseif eax == IRP_MN_REMOVE_DEVICE
invoke RtlInitUnicodeString, addr szSymName, $CTW0("\\DosDevices\\MyDriver")
invoke IoDeleteSymbolicLink, addr szSymName
mov eax, pIrp
mov (_IRP ptr [eax]).IoStatus.Status, STATUS_SUCCESS
mov eax, pDevExt
invoke IoDetachDevice, (MyDeviceExtension ptr [eax]).pNextDev
invoke IoDeleteDevice, pMyDevice
fastcall IofCompleteRequest, pIrp, IO_NO_INCREMENT
ret
.endif
IoSkipCurrentIrpStackLocation pIrp
mov eax, pDevExt
invoke IoCallDriver, (MyDeviceExtension ptr [eax]).pNextDev, pIrp
ret
IrpPnp endp
AddDevice proc pMyDriver : PDRIVER_OBJECT, pPhyDevice : PDEVICE_OBJECT
local pMyDevice : PDEVICE_OBJECT
local szDevName : UNICODE_STRING
local szSymName : UNICODE_STRING
invoke RtlInitUnicodeString, addr szDevName, $CTW0("\\Device\\MyDriver")
invoke RtlInitUnicodeString, addr szSymName, $CTW0("\\DosDevices\\MyDriver")
invoke IoCreateDevice, pMyDriver, sizeof MyDeviceExtension, addr szDevName, FILE_DEVICE_UNKNOWN, 0, FALSE, addr pMyDevice
.if eax == STATUS_SUCCESS
invoke IoAttachDeviceToDeviceStack, pMyDevice, pPhyDevice
.if eax != NULL
push eax
mov eax, pMyDevice
mov eax, (DEVICE_OBJECT ptr [eax]).DeviceExtension
pop (MyDeviceExtension ptr [eax]).pNextDev
mov eax, pMyDevice
or (DEVICE_OBJECT ptr [eax]).Flags, DO_BUFFERED_IO
and (DEVICE_OBJECT ptr [eax]).Flags, not DO_DEVICE_INITIALIZING
mov eax, STATUS_SUCCESS
mov eax, pMyDevice
mov eax, (DEVICE_OBJECT ptr [eax]).DeviceExtension
invoke KeInitializeTimer, addr (MyDeviceExtension ptr [eax]).stTimerObj
mov eax, pMyDevice
mov eax, (DEVICE_OBJECT ptr [eax]).DeviceExtension
invoke KeInitializeDpc, addr (MyDeviceExtension ptr [eax]).stTimerDPC, offset OnTimer, pMyDevice
invoke IoCreateSymbolicLink, addr szSymName, addr szDevName
.endif
.endif
ret
AddDevice endp
Unload proc pMyDriver : PDRIVER_OBJECT
ret
Unload endp
DriverEntry proc pMyDriver : PDRIVER_OBJECT, pMyRegistry : PUNICODE_STRING
mov eax, pMyDriver
mov (DRIVER_OBJECT ptr [eax]).MajorFunction[IRP_MJ_PNP * (sizeof PVOID)], offset IrpPnp
mov (DRIVER_OBJECT ptr [eax]).MajorFunction[IRP_MJ_CREATE * (sizeof PVOID)], offset IrpOpenClose
mov (DRIVER_OBJECT ptr [eax]).MajorFunction[IRP_MJ_CLOSE * (sizeof PVOID)], offset IrpOpenClose
mov (DRIVER_OBJECT ptr [eax]).MajorFunction[IRP_MJ_DEVICE_CONTROL * (sizeof PVOID)], offset IrpIOCTL
mov (DRIVER_OBJECT ptr [eax]).DriverUnload, offset Unload
mov eax, (DRIVER_OBJECT ptr [eax]).DriverExtension
mov (DRIVER_EXTENSION ptr [eax]).AddDevice, AddDevice
mov eax, STATUS_SUCCESS
ret
DriverEntry endp
end
app.asm
.386p
.model flat, stdcall
option casemap:none
include c:\masm32\include\windows.inc
include c:\masm32\include\masm32.inc
include c:\masm32\include\user32.inc
include c:\masm32\include\msvcrt.inc
include c:\masm32\include\kernel32.inc
include c:\masm32\include\w2k\ntddkbd.inc
include c:\masm32\Macros\Strings.mac
includelib c:\masm32\lib\user32.lib
includelib c:\masm32\lib\masm32.lib
includelib c:\masm32\lib\msvcrt.lib
includelib c:\masm32\lib\kernel32.lib
IOCTL_START equ CTL_CODE(FILE_DEVICE_UNKNOWN, 800h, METHOD_BUFFERED, FILE_ANY_ACCESS)
IOCTL_STOP equ CTL_CODE(FILE_DEVICE_UNKNOWN, 801h, METHOD_BUFFERED, FILE_ANY_ACCESS)
.data?
hFile dd ?
dwRet dd ?
.code
start:
invoke CreateFile, $CTA0("\\\\.\\MyDriver"), GENERIC_READ or GENERIC_WRITE, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0
mov hFile, eax
invoke DeviceIoControl, hFile, IOCTL_START, NULL, 0, NULL, 0, offset dwRet, NULL
invoke Sleep, 3000
invoke DeviceIoControl, hFile, IOCTL_STOP, NULL, 0, NULL, 0, offset dwRet, NULL
invoke CloseHandle, hFile
invoke ExitProcess, 0
end start
end
完成