驅動程式 - Windows Driver Model (WDM) - 使用範例 - Assembly (MASM32) - Handle File IRP - Choose DO_DIRECT_IO

參考資訊：
https://wasm.in/
http://four-f.narod.ru/
https://github.com/steward-fu/ddk

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\include\wxp\wdm.inc
include c:\masm32\Macros\Strings.mac

includelib c:\masm32\lib\wxp\i386\ntoskrnl.lib
    
public DriverEntry
    
MyDeviceExtension struct
    pNextDevice PDEVICE_OBJECT ?
    szBuffer byte 255 dup(?)
MyDeviceExtension ends
 
.code
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
 
IrpReadWrite proc uses ebx pMyDevice : PDEVICE_OBJECT, pIrp : PIRP
    local pBuf : dword
    local dwLen : dword
    local pDevExt : ptr
     
    and dwLen, 0
    mov eax, pMyDevice
    push (DEVICE_OBJECT ptr [eax]).DeviceExtension
    pop pDevExt
     
    IoGetCurrentIrpStackLocation pIrp
    movzx eax, (IO_STACK_LOCATION ptr [eax]).MajorFunction
    .if eax == IRP_MJ_WRITE
        invoke DbgPrint, $CTA0("IRP_MJ_WRITE")
         
        mov eax, pIrp
        MmGetMdlByteCount (_IRP ptr [eax]).MdlAddress
        mov dwLen, eax
 
        mov eax, pIrp
        MmGetSystemAddressForMdlSafe (_IRP ptr [eax]).MdlAddress, LowPagePriority
        mov pBuf, eax
        invoke DbgPrint, $CTA0("Buffer: %s, Length: %d"), pBuf, dwLen
         
        mov eax, pDevExt
        mov ebx, pBuf
        invoke memcpy, addr (MyDeviceExtension ptr [eax]).szBuffer, ebx, dwLen
    .elseif eax == IRP_MJ_READ
        invoke DbgPrint, $CTA0("IRP_MJ_READ")
         
        mov eax, pIrp
        MmGetMdlByteCount (_IRP ptr [eax]).MdlAddress
        mov dwLen, eax
 
        mov eax, pIrp
        MmGetSystemAddressForMdlSafe (_IRP ptr [eax]).MdlAddress, LowPagePriority
        mov pBuf, eax
         
        mov eax, pMyDevice
        push (DEVICE_OBJECT ptr [eax]).DeviceExtension
        pop pDevExt
     
        mov eax, pDevExt
        mov ebx, pBuf
        invoke strcpy, ebx, addr (MyDeviceExtension ptr [eax]).szBuffer
         
        mov eax, pDevExt
        invoke strlen, addr (MyDeviceExtension ptr [eax]).szBuffer
        mov dwLen, eax
    .endif
     
    mov eax, pIrp
    push dwLen
    pop (_IRP ptr [eax]).IoStatus.Information
    mov (_IRP ptr [eax]).IoStatus.Status, STATUS_SUCCESS
    fastcall IofCompleteRequest, pIrp, IO_NO_INCREMENT
    mov eax, STATUS_SUCCESS
    ret
IrpReadWrite 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]).pNextDevice
             
            mov eax, pMyDevice
            or (DEVICE_OBJECT ptr [eax]).Flags, DO_DIRECT_IO
            and (DEVICE_OBJECT ptr [eax]).Flags, not DO_DEVICE_INITIALIZING
            invoke IoCreateSymbolicLink, addr szSymName, addr szDevName
        .endif
    .endif
    ret
AddDevice endp
 
Unload proc pMyDriver : PDRIVER_OBJECT
    ret
Unload 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]).pNextDevice
        invoke IoDeleteDevice, pMyDevice
        fastcall IofCompleteRequest, pIrp, IO_NO_INCREMENT
        ret
    .endif
    IoSkipCurrentIrpStackLocation pIrp
     
    mov eax, pDevExt
    invoke IoCallDriver, (MyDeviceExtension ptr [eax]).pNextDevice, pIrp
    ret
IrpPnp 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_WRITE  * (sizeof PVOID)], offset IrpReadWrite
    mov (DRIVER_OBJECT ptr [eax]).MajorFunction[IRP_MJ_READ   * (sizeof PVOID)], offset IrpReadWrite
    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

完成