借助WinDriver认识Windows PCIE设备的空间结构

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        本文主要通过WinDriver工具图形化的查看PCIe设备，来认识PCIe设备的空间结构。本文主要参考《PCI Express体系结构导读》和网友博客：点击打开链接。

一、PCIe设备空间结构

        PCIe设备有三个独立的物理地址空间：设备存储器空间（memory）、IO空间和配置空间（config）。由于PCIe设备支持即插即用，存储器空间和IO空间是在设备插入host后由操作系统决定其映射的基地址。参考微软PLX9x5x的代码：

    //
    // Parse the resource list and save the resource information.
    //
    for (i=0; i < WdfCmResourceListGetCount(ResourcesTranslated); i++) {

        desc = WdfCmResourceListGetDescriptor( ResourcesTranslated, i );

        if(!desc) {
            TraceEvents(TRACE_LEVEL_ERROR, DBG_PNP,
                        "WdfResourceCmGetDescriptor failed");
            return STATUS_DEVICE_CONFIGURATION_ERROR;
        }

        switch (desc->Type) {

            case CmResourceTypeMemory:

                bar = NULL;

                if (foundSRAM && !foundSRAM2 &&
                    desc->u.Memory.Length == 0x400000) {

                    SRAM2BasePA = desc->u.Memory.Start;
                    SRAM2Length = desc->u.Memory.Length;
                    foundSRAM2 = TRUE;
                    bar = "BAR2";
					KdPrint(("BAR2 found.\n"));
                }

                if (foundRegs && !foundSRAM &&
                    desc->u.Memory.Length == 0x400000) {

                    SRAMBasePA = desc->u.Memory.Start;
                    SRAMLength = desc->u.Memory.Length;
                    foundSRAM = TRUE;
                    bar = "BAR1";
					KdPrint(("BAR1 found.\n" ));
                }

                if (!foundRegs &&
                    desc->u.Memory.Length == 0x1000) {

                    regsBasePA = desc->u.Memory.Start;
                    regsLength = desc->u.Memory.Length;
                    foundRegs = TRUE;
                    bar = "BAR0";

					KdPrint(("BAR0 found.\n"));

                }

                TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP,
                            " - Memory Resource [%I64X-%I64X] %s",
                            desc->u.Memory.Start.QuadPart,
                            desc->u.Memory.Start.QuadPart +
                            desc->u.Memory.Length,
                            (bar) ? bar : "<unrecognized>" );


				KdPrint(("desc->u.Memory.Start is %x, desc->u.Memory.length is %x\n", desc->u.Memory.Start, desc->u.Memory.Length));



                break;

            case CmResourceTypePort:

                bar = NULL;

                if (!foundPort &&
                    desc->u.Port.Length >= 0x100) {
                    foundPort = TRUE;
                    bar = "Port";
                }

                TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP,
                            " - Port   Resource [%08I64X-%08I64X] %s",
                            desc->u.Port.Start.QuadPart,
                            desc->u.Port.Start.QuadPart +
                            desc->u.Port.Length,
                            (bar) ? bar : "<unrecognized>" );

				KdPrint(("CmResourceTypePort is found.\n" ));
                break;

            default:
                //
                // Ignore all other descriptors
                //
                break;
        }
    }

    if (!(foundRegs && foundSRAM)) {
        TraceEvents(TRACE_LEVEL_ERROR, DBG_PNP,
                    "PLxMapResources: Missing resources");
        return STATUS_DEVICE_CONFIGURATION_ERROR;
    }

二、WinDriver截图

1，存储器空间

该设备共映射了6块存储器空间，其中第一块4kB，后面5块大小都是32MB。也可重windows的设备管理器中看到相同的结果。

2，配置空间

借助WinDriver认识Windows PCIE设备的空间结构

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原文地址：http://blog.csdn.net/sagittarius_warrior/article/details/51333055