windows server 2003下驱动问题

ocon 2009-5-14 14:45 楼主

我用的是Xilinx的ML505这块开发板，Xilinx提供的硬件代码、驱动和应用软件PCI_express_DMA_Freeware_Virtex。
这个驱动要分配一段连续的内存来读写。下面两个函数是在EvtDeviceAdd调用。 EvtDeviceAdd is called by the framework in response to AddDevice call from the PnP manager

DevExt->BufferLogicalAddress = MmAllocateContiguousMemory(DevExt->BufferSize, physicalAddress);

physicalAddress = MmGetPhysicalAddress((PVOID)DevExt->BufferLogicalAddress);

下面的函数是在PCIEIOCtrlCode调用。
case IOCTL_GET_BUFFERADDRESS:
{
phyAddress.HighPart = 0;
phyAddress.LowPart = (ULONG)devExt->BufferPhysicalAddress;

devExt->BufferSystemVirtualAddress = MmMapIoSpace(phyAddress, PCIE_BUFFER_SIZE, MmNonCached);

devExt->BufferMdl = IoAllocateMdl(devExt->BufferSystemVirtualAddress, PCIE_BUFFER_SIZE, FALSE, FALSE, NULL);

MmBuildMdlForNonPagedPool(devExt->BufferMdl);

devExt->BufferUserVirtualAddress = (PVOID)(((ULONG)PAGE_ALIGN(MmMapLockedPages(devExt->BufferMdl, UserMode))) + MmGetMdlByteOffset(devExt->BufferMdl));

}

这个驱动在windows xp下可以正常使用，但是在windows server 2003下就会出现蓝屏，错误的地方是这样一个函数：
MmMapLockedPages(devExt->Buffer2Mdl, UserMode)，我用windbg调试，显示：MmUnmapLockedPages called when not at APC_LEVEL or below.

我把usermode改为kernelmode就可以，我还用MmMapLockedPagesSpecifyCache(devExt->BufferMdl, UserMode,MmNonCached,NULL,FALSE,NormalPagePriority)
来代替，也是usermode的问题，为什么一样的函数在xp下可以用，在server下就不能用呢？

但是改为kernelmode后函数返回的地址是内核地址，用户态不能用，所以不知道该怎么办啊。

回复评论（4）

沙发 xyw6813927

mark

点赞 2009-5-15 02:24

板凳 dlw123

我还用了另外一种方法：
physicalAddress.LowPart  = 0x80000000;
physicalAddress.HighPart = 0x0;

SkipBytes.LowPart=0x00001000;
SkipBytes.LowPart=0x0;
DevExt->BufferMdl = MmAllocatePagesForMdl(LowAddress,
            physicalAddress,
            SkipBytes,
            DevExt->BufferSize);
if(!DevExt->BufferMdl)
{
      return STATUS_INSUFFICIENT_RESOURCES;
}
DevExt->BufferPhysicalAddress = MmGetSystemAddressForMdlSafe(
                                                                                                                                          DevExt->BufferMdl,
                                                                                                                                          NormalPagePriority);

DevExt->BufferUserVirtualAddress= MmMapLockedPagesSpecifyCache(DevExt->BufferMdl,
                     UserMode,
                     MmNonCached,
                     NULL,
                     FALSE,
                     NormalPagePriority);

还是在MmMapLockedPagesSpecifyCache这个函数处出现蓝屏。

点赞 2009-5-18 10:44