Kernel Mode Driver Framework>> Assembly (PNP) >> File

WdfDeviceIoDirect(DMA)


參考資訊:
1. Source Code

由於我們練習的驅動程式位於上層,本身並沒有觸及過多DMA的細節操作,因此,WdfDeviceIoDirect的DMA作法會跟PIO一樣,唯一的區別就是取得DMA位址的方式,必須使用特殊的API取得,這篇練習在於說明有這樣的記憶體差別,當使用者實際觸及DMA驅動程式時,必須詳細閱讀DMA的操作方式。

記憶體指標:

Event Buffer Length
EvtIoRead Step 1. WdfRequestRetrieveOutputWdmMdl()
Step 2. MmGetMdlVirtualAddress()
傳入的第三個參數
EvtIoWrite Step 1. WdfRequestRetrieveInputWdmMdl()
Step 2. MmGetMdlVirtualAddress()
傳入的第三個參數

main.asm

.386p
.model flat, stdcall
option casemap:none

include c:\masm32\Macros\Strings.mac
include c:\masm32\include\w2k\ntdef.inc
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\wdf\umdf\1.9\wudfddi_types.inc
include c:\masm32\include\wdf\kmdf\1.9\wdf.inc
include c:\masm32\include\wdf\kmdf\1.9\wdftypes.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfglobals.inc
include c:\masm32\include\wdf\kmdf\1.9\wdffuncenum.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfobject.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfdevice.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfdriver.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfrequest.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfio.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfmemory.inc

includelib c:\masm32\lib\wxp\i386\BufferOverflowK.lib 
includelib c:\masm32\lib\wxp\i386\ntoskrnl.lib 
includelib c:\masm32\lib\wxp\i386\hal.lib 
includelib c:\masm32\lib\wxp\i386\wmilib.lib 
includelib c:\masm32\lib\wxp\i386\sehupd.lib 
includelib c:\masm32\lib\wdf\kmdf\i386\1.9\wdfldr.lib
includelib c:\masm32\lib\wdf\kmdf\i386\1.9\wdfdriverentry.lib

public DriverEntry

.const
DEV_NAME word "\","D","e","v","i","c","e","\","M","y","D","r","i","v","e","r",0
SYM_NAME word "\","D","o","s","D","e","v","i","c","e","s","\","M","y","D","r","i","v","e","r",0

.data
szBuffer byte 255 dup(0)

.code
IrpFileCreate proc Device:WDFDEVICE, Request:WDFREQUEST, FileObject:WDFFILEOBJECT
  invoke DbgPrint, $CTA0("IrpFieCreate")
  invoke WdfRequestComplete, Request, STATUS_SUCCESS
  ret
IrpFileCreate endp

IrpFileClose proc FileObject:WDFFILEOBJECT
  invoke DbgPrint, $CTA0("IrpFieClose")
  ret
IrpFileClose endp

IrpRead proc Queue:WDFQUEUE, Request:WDFREQUEST, _Length:DWORD
  local mdl:PMDL
  local len:DWORD
  
  invoke DbgPrint, $CTA0("IrpRead")
  invoke strlen, offset szBuffer
  inc eax
  mov len, eax
  invoke WdfRequestRetrieveOutputWdmMdl, Request, addr mdl
  MmGetMdlVirtualAddress mdl
  invoke memcpy, eax, offset szBuffer, len
  invoke WdfRequestCompleteWithInformation, Request, STATUS_SUCCESS, len
  ret
IrpRead endp

IrpWrite proc Queue:WDFQUEUE, Request:WDFREQUEST, _Length:DWORD
  local mdl:PMDL
  
  invoke DbgPrint, $CTA0("IrpWrite")
  invoke WdfRequestRetrieveInputWdmMdl, Request, addr mdl
  MmGetMdlVirtualAddress mdl
  invoke memcpy, offset szBuffer, eax, _Length
  invoke DbgPrint, $CTA0("Buffer: %s, Length:%d"), offset szBuffer, _Length
  invoke WdfRequestCompleteWithInformation, Request, STATUS_SUCCESS, _Length
  ret
IrpWrite endp

AddDevice proc Driver:WDFDRIVER, pDeviceInit:PWDFDEVICE_INIT
  local device:WDFDEVICE
  local suDevName:UNICODE_STRING
  local szSymName:UNICODE_STRING
  local file_cfg:WDF_FILEOBJECT_CONFIG
  local ioqueue_cfg:WDF_IO_QUEUE_CONFIG

  invoke RtlInitUnicodeString, addr suDevName, offset DEV_NAME
  invoke RtlInitUnicodeString, addr szSymName, offset SYM_NAME
  invoke WdfDeviceInitAssignName, pDeviceInit, addr suDevName
  invoke WdfDeviceInitSetIoType, pDeviceInit, WdfDeviceIoDirect
  invoke WDF_FILEOBJECT_CONFIG_INIT, addr file_cfg, offset IrpFileCreate, offset IrpFileClose, NULL
  invoke WdfDeviceInitSetFileObjectConfig, pDeviceInit, addr file_cfg, WDF_NO_OBJECT_ATTRIBUTES
  invoke WdfDeviceCreate, addr pDeviceInit, WDF_NO_OBJECT_ATTRIBUTES, addr device
  invoke WdfDeviceCreateSymbolicLink, device, addr szSymName
  
  invoke WDF_IO_QUEUE_CONFIG_INIT_DEFAULT_QUEUE, addr ioqueue_cfg, WdfIoQueueDispatchSequential
  lea eax, ioqueue_cfg
  mov (WDF_IO_QUEUE_CONFIG ptr [eax]).EvtIoRead, offset IrpRead
  mov (WDF_IO_QUEUE_CONFIG ptr [eax]).EvtIoWrite, offset IrpWrite
  invoke WdfIoQueueCreate, device, addr ioqueue_cfg, WDF_NO_OBJECT_ATTRIBUTES, WDF_NO_HANDLE
  ret
AddDevice endp

DriverEntry proc pOurDriver:PDRIVER_OBJECT, pOurRegistry:PUNICODE_STRING
  local config:WDF_DRIVER_CONFIG
  
  invoke WDF_DRIVER_CONFIG_INIT, addr config, AddDevice
  invoke WdfDriverCreate, pOurDriver, pOurRegistry, WDF_NO_OBJECT_ATTRIBUTES, addr config, WDF_NO_HANDLE
  ret
DriverEntry endp
end DriverEntry
.end

IrpWrite()複製User Application的資料到szBuffer
IrpRead()回填資料給User Application

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

includelib c:\masm32\lib\user32.lib
includelib c:\masm32\lib\masm32.lib
includelib c:\masm32\lib\msvcrt.lib
includelib c:\masm32\lib\kernel32.lib

.const
DEV_NAME  db "\\.\MyDriver",0
MSG_ERR   db "failed to open mydriver",10,13,0
MSG_SEND  db "I am error",0
MSG_WRITE db "WR: %s, %d",10,13,0
MSG_READ  db "RD: %s, %d",10,13,0

.data?
hFile    dd ?
dwRet    dd ?
szBuffer db 256 dup(?)

.code
start:
  invoke CreateFile, offset DEV_NAME, GENERIC_READ or GENERIC_WRITE, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0
  .if eax == INVALID_HANDLE_VALUE
    invoke crt_printf, offset MSG_ERR
    invoke ExitProcess, -1
  .endif
  
  mov hFile, eax
  invoke StrLen, offset MSG_SEND
  inc eax
  mov dwRet, eax
  invoke crt_printf, offset MSG_WRITE, offset MSG_SEND, dwRet
  invoke WriteFile, hFile, offset MSG_SEND, dwRet, offset dwRet, 0
  invoke crt_memset, offset szBuffer, 0, 255
  invoke ReadFile, hFile, offset szBuffer, 255, offset dwRet, 0
  invoke crt_printf, offset MSG_READ, offset szBuffer, dwRet
  invoke CloseHandle, hFile
  invoke ExitProcess, 0
end start

結果


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