Struct hal_x86_64::task::StateSegment

#[repr(C, packed(4))]
pub struct StateSegment {
    pub privilege_stacks: [VAddr; 3],
    pub interrupt_stacks: [VAddr; 7],
    pub iomap_offset: u16,
    /* private fields */
}

A 64-bit mode task-state segment (TSS).

Fields

privilege_stacks: [VAddr; 3]

The stack pointers for privilege levels 0-2.

These addresses must be in canonical form.

interrupt_stacks: [VAddr; 7]

The interrupt stack table.

iomap_offset: u16

The 16-bit offset from the TSS’ base address to the I/O permissions bitmap.

Implementations

impl StateSegment

pub const fn empty() -> Self

Returns a new task-state segment with all fields zeroed.

pub fn iomap_addr(&self) -> VAddr

Returns the virtual address of the I/O permission bitmap.

pub unsafe fn load_tss(selector: Selector)

Loads the provided selector into the current task register.

Prefer this higher-level wrapper to the ltr CPU intrinsic.

Safety

The caller is responsible for ensuring that selector selects a valid task state segment, and that the selected TSS will not be deallocated as long as it’s active.

Trait Implementations

impl Clone for StateSegment

fn clone(&self) -> StateSegment

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for StateSegment

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

Formats the value using the given formatter.

impl Default for StateSegment

fn default() -> Self

Returns the “default value” for a type.

impl Copy for StateSegment