Struct Trb 

#[repr(C, align(16))]
pub struct Trb {
    pub parameter_lo: u32,
    pub parameter_hi: u32,
    pub status: u32,
    pub control: u32,
}

Generic 16-byte Transfer Request Block

All TRBs share this common layout per xHCI spec Section 4.11.

Fields

parameter_lo: u32

Parameter low DWORD (meaning varies by TRB type)

parameter_hi: u32

Parameter high DWORD

status: u32

Status DWORD (transfer length, completion code, etc.)

control: u32

Control DWORD (TRB type, cycle bit, flags)

Implementations

impl Trb

pub const fn zeroed() -> Self

Create a zeroed TRB

pub fn trb_type(&self) -> u8

Get the TRB type field (bits 15:10 of control)

pub fn set_trb_type(&mut self, trb_type: u8)

Set the TRB type field

pub fn cycle_bit(&self) -> bool

Get the cycle bit

pub fn set_cycle_bit(&mut self, cycle: bool)

Set the cycle bit

pub fn completion_code(&self) -> u8

Get completion code from status DWORD (bits 31:24)

pub fn slot_id(&self) -> u8

Get the slot ID from control DWORD (bits 31:24)

pub fn set_slot_id(&mut self, slot: u8)

Set the slot ID in control DWORD (bits 31:24)

pub fn transfer_length(&self) -> u32

Get the transfer length from status DWORD (bits 16:0)

pub fn set_transfer_length(&mut self, len: u32)

Set the transfer length in status DWORD (bits 16:0)

pub fn normal(data_phys: u64, length: u32, ioc: bool, cycle: bool) -> Self

Create a Normal TRB for bulk/interrupt transfers

pub fn setup_stage( request_type: u8, request: u8, value: u16, index: u16, length: u16, transfer_type: SetupTransferType, cycle: bool, ) -> Self

Create a Setup Stage TRB for control transfers

pub fn data_stage( data_phys: u64, length: u32, direction_in: bool, cycle: bool, ) -> Self

Create a Data Stage TRB for control transfers

pub fn status_stage(direction_in: bool, ioc: bool, cycle: bool) -> Self

Create a Status Stage TRB for control transfers

pub fn link(segment_phys: u64, toggle_cycle: bool, cycle: bool) -> Self

Create a Link TRB pointing to the start of a ring segment

pub fn event_data(data: u64, ioc: bool, cycle: bool) -> Self

Create an Event Data TRB

pub fn noop(ioc: bool, cycle: bool) -> Self

Create a No-Op TRB (transfer ring)

pub fn enable_slot(cycle: bool) -> Self

Create an Enable Slot Command TRB

pub fn disable_slot(slot_id: u8, cycle: bool) -> Self

Create a Disable Slot Command TRB

pub fn address_device( input_context_phys: u64, slot_id: u8, bsr: bool, cycle: bool, ) -> Self

Create an Address Device Command TRB

pub fn configure_endpoint( input_context_phys: u64, slot_id: u8, deconfigure: bool, cycle: bool, ) -> Self

Create a Configure Endpoint Command TRB

pub fn noop_cmd(cycle: bool) -> Self

Create a No-Op Command TRB

Trait Implementations

impl Clone for Trb

fn clone(&self) -> Trb

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Trb

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Trb

fn eq(&self, other: &Trb) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Trb

impl Eq for Trb

impl StructuralPartialEq for Trb