!usbkd._ehciregs
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