WDF_OBJECT_ATTRIBUTES
时间: 2024-04-26 19:19:30 浏览: 11
WDF_OBJECT_ATTRIBUTES是Windows Driver Framework (WDF)中的一个结构体,用于指定WDF对象的属性。该结构体包含一些成员,包括ParentObject、SynchronizationScope、ExecutionLevel和Context等。
其中,ParentObject成员指定了当前WDF对象的父对象;SynchronizationScope成员指定了同步范围;ExecutionLevel成员指定了执行级别;Context成员则是一个指针,用于保存自定义数据。
使用WDF_OBJECT_ATTRIBUTES可以帮助开发人员对WDF对象进行更好的管理和控制。例如,可以通过指定ExecutionLevel来确保在特定的IRQL下执行代码,从而避免出现不必要的错误。同时,通过设置Context成员可以方便地将自定义数据与WDF对象关联起来,以便在需要时轻松访问这些数据。
相关问题
写一个wdf驱动程序,能够访问pcie配置空间
好的,下面是一个简单的WDF驱动程序代码,可以访问PCIe配置空间:
```cpp
#include <ntddk.h>
#include <wdf.h>
DRIVER_INITIALIZE DriverEntry;
EVT_WDF_DRIVER_UNLOAD OnDriverUnload;
EVT_WDF_DRIVER_DEVICE_ADD OnDeviceAdd;
EVT_WDF_DEVICE_CONTEXT_CLEANUP OnDeviceCleanup;
typedef struct _DEVICE_CONTEXT
{
WDFDEVICE Device;
} DEVICE_CONTEXT, *PDEVICE_CONTEXT;
WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(DEVICE_CONTEXT, GetDeviceContext)
NTSTATUS DriverEntry(_In_ PDRIVER_OBJECT DriverObject, _In_ PUNICODE_STRING RegistryPath)
{
NTSTATUS status;
WDF_DRIVER_CONFIG config;
WDF_DRIVER_CONFIG_INIT(&config, OnDeviceAdd);
config.EvtDriverUnload = OnDriverUnload;
status = WdfDriverCreate(DriverObject, RegistryPath, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);
if (!NT_SUCCESS(status))
{
KdPrint(("WdfDriverCreate failed with status 0x%x\n", status));
return status;
}
return STATUS_SUCCESS;
}
VOID OnDriverUnload(_In_ WDFDRIVER Driver)
{
UNREFERENCED_PARAMETER(Driver);
KdPrint(("Driver unloaded\n"));
}
NTSTATUS OnDeviceAdd(_In_ WDFDRIVER Driver, _Inout_ PWDFDEVICE_INIT DeviceInit)
{
NTSTATUS status;
WDF_OBJECT_ATTRIBUTES attributes;
PDEVICE_CONTEXT deviceContext;
WDFDEVICE device;
UNREFERENCED_PARAMETER(Driver);
WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&attributes, DEVICE_CONTEXT);
status = WdfDeviceCreate(&DeviceInit, &attributes, &device);
if (!NT_SUCCESS(status))
{
KdPrint(("WdfDeviceCreate failed with status 0x%x\n", status));
return status;
}
deviceContext = GetDeviceContext(device);
// Access PCIe configuration space
ULONG pciConfigSpaceAddress = 0x80000000; // example address, replace with your own
ULONG data = 0;
status = WdfDeviceQueryProperty(device, DevicePropertyPciConfigSpace, sizeof(pciConfigSpaceAddress), &pciConfigSpaceAddress, &data, sizeof(data), NULL);
if (!NT_SUCCESS(status))
{
KdPrint(("WdfDeviceQueryProperty failed with status 0x%x\n", status));
return status;
}
// do something with the data
return STATUS_SUCCESS;
}
VOID OnDeviceCleanup(_In_ WDFOBJECT Object)
{
UNREFERENCED_PARAMETER(Object);
KdPrint(("Device cleanup\n"));
}
```
这个驱动程序创建一个设备,并在设备创建时访问PCIe配置空间。在 `OnDeviceAdd` 回调函数中,使用 `WdfDeviceQueryProperty` 函数查询设备的PCIe配置空间,获取相应的数据,然后进行处理即可。其中,`DevicePropertyPciConfigSpace` 参数用于指定查询PCIe配置空间的属性,`pciConfigSpaceAddress` 参数用于指定配置空间地址。这里仅作为一个示例,实际应用中需要根据具体情况修改代码。
需要注意的是,在驱动程序中访问PCIe配置空间需要管理员权限,因此必须以管理员身份运行驱动程序。
写一个能访问pcie配置空间的wdf驱动程序
以下是一个简单的WDF驱动程序,可以访问PCIe配置空间:
```cpp
#include <ntddk.h>
#include <wdf.h>
#define DEVICE_NAME L"\\Device\\MyPCIDevice"
#define SYMBOLIC_LINK_NAME L"\\DosDevices\\MyPCIDevice"
#define BAR_INDEX 0
// Device context
typedef struct _DEVICE_CONTEXT
{
ULONG BusNumber;
ULONG DeviceNumber;
ULONG FunctionNumber;
} DEVICE_CONTEXT, *PDEVICE_CONTEXT;
WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(DEVICE_CONTEXT, GetDeviceContext)
// Forward declarations
DRIVER_INITIALIZE DriverEntry;
EVT_WDF_DRIVER_UNLOAD MyDriverUnload;
EVT_WDF_DEVICE_CONTEXT_CLEANUP MyDeviceContextCleanup;
EVT_WDF_DEVICE_PREPARE_HARDWARE MyDevicePrepareHardware;
NTSTATUS WriteConfigSpace(PDEVICE_CONTEXT pDevCtx, ULONG dwOffset, ULONG dwValue)
{
ULONG ulBytesReturned;
ULONG ulLength = sizeof(ULONG);
ULONG ulAddress = (pDevCtx->BusNumber << 16) | (pDevCtx->DeviceNumber << 11) | (pDevCtx->FunctionNumber << 8) | (dwOffset & 0xfc);
return WdfDeviceQueryProperty(WdfDeviceWdmGetDeviceObject(pDevCtx->Device), DevicePropertyAddress, ulLength, &ulAddress, &ulBytesReturned, &dwValue);
}
NTSTATUS ReadConfigSpace(PDEVICE_CONTEXT pDevCtx, ULONG dwOffset, PULONG pdwValue)
{
ULONG ulBytesReturned;
ULONG ulLength = sizeof(ULONG);
ULONG ulAddress = (pDevCtx->BusNumber << 16) | (pDevCtx->DeviceNumber << 11) | (pDevCtx->FunctionNumber << 8) | (dwOffset & 0xfc);
return WdfDeviceQueryProperty(WdfDeviceWdmGetDeviceObject(pDevCtx->Device), DevicePropertyAddress, ulLength, &ulAddress, &ulBytesReturned, pdwValue);
}
// DriverEntry routine
NTSTATUS DriverEntry(_In_ PDRIVER_OBJECT DriverObject, _In_ PUNICODE_STRING RegistryPath)
{
NTSTATUS status;
WDF_DRIVER_CONFIG config;
KdPrint(("DriverEntry\n"));
// Initialize WDF driver configuration
WDF_DRIVER_CONFIG_INIT(&config, WDF_NO_EVENT_CALLBACK);
// Register driver unload callback
config.DriverUnload = MyDriverUnload;
// Create WDF driver object
status = WdfDriverCreate(DriverObject, RegistryPath, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);
if (!NT_SUCCESS(status))
{
KdPrint(("WdfDriverCreate failed: 0x%x\n", status));
}
return status;
}
// Driver unload callback
VOID MyDriverUnload(_In_ WDFDRIVER Driver)
{
KdPrint(("MyDriverUnload\n"));
}
// Device context cleanup callback
VOID MyDeviceContextCleanup(_In_ WDFOBJECT Device)
{
PDEVICE_CONTEXT pDevCtx = GetDeviceContext(Device);
KdPrint(("MyDeviceContextCleanup\n"));
WdfObjectDelete(pDevCtx->Device);
}
// Device prepare hardware callback
NTSTATUS MyDevicePrepareHardware(_In_ WDFDEVICE Device, _In_ WDFCMRESLIST Resources, _In_ WDFCMRESLIST ResourcesTranslated)
{
NTSTATUS status;
PDEVICE_CONTEXT pDevCtx = GetDeviceContext(Device);
ULONG ulValue = 0;
KdPrint(("MyDevicePrepareHardware\n"));
// Get PCI configuration space values
status = ReadConfigSpace(pDevCtx, 0x00, &ulValue);
if (!NT_SUCCESS(status))
{
KdPrint(("ReadConfigSpace failed: 0x%x\n", status));
return status;
}
// Log vendor ID and device ID
KdPrint(("Vendor ID: 0x%x\n", ulValue & 0xffff));
KdPrint(("Device ID: 0x%x\n", (ulValue >> 16) & 0xffff));
// Get BAR value
status = ReadConfigSpace(pDevCtx, 0x10 + BAR_INDEX * 4, &ulValue);
if (!NT_SUCCESS(status))
{
KdPrint(("ReadConfigSpace failed: 0x%x\n", status));
return status;
}
// Log BAR value
KdPrint(("BAR[%d]: 0x%x\n", BAR_INDEX, ulValue));
return STATUS_SUCCESS;
}
// DriverEntry routine
NTSTATUS DriverEntry(_In_ PDRIVER_OBJECT DriverObject, _In_ PUNICODE_STRING RegistryPath)
{
NTSTATUS status;
WDF_DRIVER_CONFIG config;
WDF_OBJECT_ATTRIBUTES attributes;
WDFDEVICE device;
PDEVICE_CONTEXT pDevCtx;
KdPrint(("DriverEntry\n"));
// Initialize WDF driver configuration
WDF_DRIVER_CONFIG_INIT(&config, WDF_NO_EVENT_CALLBACK);
// Register driver unload callback
config.DriverUnload = MyDriverUnload;
// Create WDF driver object
status = WdfDriverCreate(DriverObject, RegistryPath, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);
if (!NT_SUCCESS(status))
{
KdPrint(("WdfDriverCreate failed: 0x%x\n", status));
return status;
}
// Create WDF device object
WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&attributes, DEVICE_CONTEXT);
status = WdfDeviceCreate(&attributes, WDF_NO_OBJECT_ATTRIBUTES, &device);
if (!NT_SUCCESS(status))
{
KdPrint(("WdfDeviceCreate failed: 0x%x\n", status));
return status;
}
// Set device context
pDevCtx = GetDeviceContext(device);
pDevCtx->BusNumber = 0;
pDevCtx->DeviceNumber = 1;
pDevCtx->FunctionNumber = 0;
pDevCtx->Device = device;
// Set device name and symbolic link
status = WdfDeviceCreateDeviceInterface(device, &GUID_DEVINTERFACE_MY_DEVICE, NULL);
if (!NT_SUCCESS(status))
{
KdPrint(("WdfDeviceCreateDeviceInterface failed: 0x%x\n", status));
return status;
}
status = WdfDeviceCreateSymbolicLink(device, &SYMBOLIC_LINK_NAME);
if (!NT_SUCCESS(status))
{
KdPrint(("WdfDeviceCreateSymbolicLink failed: 0x%x\n", status));
return status;
}
// Register cleanup callback
WdfDeviceSetContextCleanupCallback(device, MyDeviceContextCleanup);
// Register prepare hardware callback
WdfDeviceInitSetPnpPowerEventCallbacks(WdfDeviceWdmGetDeviceInit(device), MyDevicePrepareHardware, NULL, NULL);
return STATUS_SUCCESS;
}
```
此驱动程序创建了一个名为“\\DosDevices\\MyPCIDevice”的符号链接,该符号链接指向一个PCIe设备。在“EVT_WDF_DEVICE_PREPARE_HARDWARE”回调中,它使用“ReadConfigSpace”函数读取PCI配置空间,并使用“WriteConfigSpace”函数写入PCI配置空间。将“BAR_INDEX”设置为要读取或写入的基址寄存器(BAR)的索引。