Module xhci 

xHCI (eXtensible Host Controller Interface) USB 3.x driver

Implements PCI discovery, MMIO register access, Transfer Ring Buffers (TRBs), Command/Event/Transfer rings, device slot management, port handling, USB descriptor parsing, and MSI-X interrupt stubs for xHCI controllers.

xHCI PCI identification: class 0x0C, subclass 0x03, prog-if 0x30.

Structs

CommandRing

Command Ring: the host controller dequeues command TRBs from here

DeviceSlot

Per-device-slot tracking information

EventRing

Event Ring: the host controller enqueues event TRBs here

EventRingSegmentTableEntry

Event Ring Segment Table Entry (xHCI spec 6.5)

MsixCapability

MSI-X capability structure offsets (within PCI config space)

MsixTableEntry

MSI-X table entry (16 bytes per entry)

RingState

Producer/consumer cycle state for ring buffers

TransferRing

Transfer Ring: per-endpoint ring for bulk/interrupt/control data transfers

Trb

Generic 16-byte Transfer Request Block

XhciCapabilities

xHCI controller capabilities parsed from Capability Registers

XhciConfigDescriptor

Parsed USB Configuration Descriptor header (9 bytes)

XhciController

State of the xHCI controller

XhciDeviceDescriptor

Parsed USB Device Descriptor (18 bytes)

XhciEndpointDescriptor

Parsed USB Endpoint Descriptor (7 bytes)

XhciInterfaceDescriptor

Parsed USB Interface Descriptor (9 bytes)

XhciPciDevice

Information about a discovered xHCI PCI device

XhciPort

xHCI port information

Enums

EndpointTransferType

Endpoint transfer type

PortSpeed

Port speed as reported by xHCI PORTSC

SetupTransferType

Transfer type for Setup Stage TRB (control DWORD bits 17:16)

SlotState

State of a device slot

Functions

configure_msix

Configure MSI-X for the xHCI controller.

controller_count

Get the number of discovered xHCI controllers

find_xhci_controllers

Scan the PCI bus for xHCI controllers and return their BAR0 addresses.

init

Initialize the xHCI subsystem.

is_initialized

Check if the xHCI subsystem has been initialized

is_xhci_device

Check if a PCI device is an xHCI controller

msix_interrupt_handler

MSI-X interrupt handler stub.

parse_configuration_descriptors

Parse all descriptors from a full configuration descriptor buffer.

Type Aliases

InterfaceWithEndpoints

A parsed interface paired with its endpoint descriptors.