Module capability

PCI Capability chain walking and VirtIO capability parsing.

Provides functions to discover and parse VirtIO PCI Modern capabilities.

Reference

• PCI Spec 3.0 §6.7 (Capability List)
• VirtIO Spec 1.2 §4.1.4 (PCI Device Discovery)

Structs

• VirtioCapInfo
  Parsed VirtIO PCI capability information.
• VirtioPciCaps
  Collection of all VirtIO PCI capabilities for a device.
• WalkCaps 🔒

Constants

• PCI_CAP_ID_VNDR
  PCI capability ID: Vendor-specific (used by VirtIO).
• VIRTIO_PCI_CAP_COMMON
  VirtIO PCI capability type: Common configuration.
• VIRTIO_PCI_CAP_DEVICE
  VirtIO PCI capability type: Device-specific configuration.
• VIRTIO_PCI_CAP_ISR
  VirtIO PCI capability type: ISR status.
• VIRTIO_PCI_CAP_NOTIFY
  VirtIO PCI capability type: Notification area.
• VIRTIO_PCI_CAP_PCI_CFG
  VirtIO PCI capability type: PCI config access alternative.

Functions

• asm_pci_find_cap 🔒 ^⚠
  Find capability by ID.
• asm_pci_find_virtio_cap 🔒 ^⚠
  Find VirtIO capability by cfg_type.
• asm_pci_get_cap_ptr 🔒 ^⚠
  Get first capability pointer.
• asm_pci_has_capabilities 🔒 ^⚠
  Check if device has capability list.
• asm_virtio_pci_parse_cap 🔒 ^⚠
  Parse VirtIO capability at offset.
• asm_virtio_pci_probe_caps 🔒 ^⚠
  Probe all VirtIO caps and fill array.
• asm_virtio_pci_read_bar 🔒 ^⚠
  Read BAR value. Returns: RAX = address, RDX = 1 if memory / 0 if IO
• dump_capabilities
  Dump all capabilities to serial (uses crate’s serial_println if available).
• find_cap
  Find a capability by ID.
• find_virtio_cap
  Find a VirtIO capability by cfg_type.
• get_cap_ptr
  Get the first capability pointer for a device.
• has_capabilities
  Check if a PCI device supports capability list.
• parse_virtio_cap
  Parse a VirtIO capability at the given config space offset.
• probe_virtio_caps
  Probe all VirtIO capabilities for a device.
• read_bar
  Read a BAR base address.
• walk_capabilities_rust
  Walk capability chain in pure Rust (fallback).