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!usbkd._ehciregs

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The !usbkd._ehciregs command displays the operational and root hub port status registers of a USB EHCI host controller.

!usbkd._ehciregs StructAddr[, NumPorts]

Parameters

StructAddr
Address of a usbehci!_HC_OPERATIONAL_REGISTER structure. To find the address of a usbehci!_HC_OPERATIONAL_REGISTER structure, use !usbkd.usbhcdlist.

NumPorts
The number of root hub port status registers to display.

DLL

Usbkd.dll

Examples

Here is one way to get the address of a usbehci!_HC_OPERATIONAL_REGISTER structure. First enter !usbkd.usbhcdlist.

0: kd> !usbkd.usbhcdlist
MINIPORT List @ fffff80001e5bbd0

## List of EHCI controllers

!drvobj ffffe00001fd33a0 dt USBPORT!_USBPORT_MINIPORT_DRIVER ...
...
02. Xxxx Corporation PCI: VendorID Xxxx DeviceID Xxxx RevisionId 0002
    !devobj ffffe00001ca1050
    !ehci_info ffffe00001ca11a0
    Operational Registers ffffd000228bf020

In the preceding output, ffffd000228bf020 is the address of a _HC_OPERATIONAL_REGISTER structure.

Now pass the structure address to !_ehciregs. In this example, the second argument limits the display to two root hub port status registers.

0: kd> !usbkd._ehciregs ffffd000228bf020, 2
*(ehci)HC_OPERATIONAL_REGISTER ffffd000228bf020
    USBCMD 00010001
    .HostControllerRun: 1
    .HostControllerReset: 0
    .FrameListSize: 0
    .PeriodicScheduleEnable: 0
    .AsyncScheduleEnable: 0
    .IntOnAsyncAdvanceDoorbell: 0
    .HostControllerLightReset: 0
    .InterruptThreshold: 1
    .ParkModeEnable: 0
    .ParkModeCount: 0

    USBSTS 00002008
    .UsbInterrupt: 0
    .UsbError: 0
    .PortChangeDetect: 0
    .FrameListRollover: 1
    .HostSystemError: 0
    .IntOnAsyncAdvance: 0
    ----
    .HcHalted: 0
    .Reclamation: 1
    .PeriodicScheduleStatus: 0
    .AsyncScheduleStatus: 0

    USBINTR 0000003f
    .UsbInterrupt: 1
    .UsbError: 1
    .PortChangeDetect: 1
    .FrameListRollover: 1
    .HostSystemError: 1
    .IntOnAsyncAdvance: 1
    PeriodicListBase dec8e000
    AsyncListAddr dec91000
    PortSC[0] 00001000
        PortConnect x0
        PortConnectChange x0
        PortEnable x0
        PortEnableChange x0
        OvercurrentActive x0
        OvercurrentChange x0
        ForcePortResume x0
        PortSuspend x0
        PortReset x0
        HighSpeedDevice x0
        LineStatus x0
        PortPower x1
        PortOwnedByCC x0
        PortIndicator x0
        PortTestControl x0
        WakeOnConnect x0
        WakeOnDisconnect x0
        WakeOnOvercurrent x0
    PortSC[1] 00001000
        PortConnect x0
        PortConnectChange x0
        PortEnable x0
        PortEnableChange x0
        OvercurrentActive x0
        OvercurrentChange x0
        ForcePortResume x0
        PortSuspend x0
        PortReset x0
        HighSpeedDevice x0
        LineStatus x0
        PortPower x1
        PortOwnedByCC x0
        PortIndicator x0
        PortTestControl x0
        WakeOnConnect x0
        WakeOnDisconnect x0

See also

USB 2.0 Debugger Extensions

Universal Serial Bus (USB) Drivers