Struct TaskStateSegment 

#[repr(C, packed(4))]
pub struct TaskStateSegment {
    reserved_1: u32,
    pub privilege_stack_table: [VirtAddr; 3],
    reserved_2: u64,
    pub interrupt_stack_table: [VirtAddr; 7],
    reserved_3: u64,
    reserved_4: u16,
    pub iomap_base: u16,
}

In 64-bit mode the TSS holds information that is not directly related to the task-switch mechanism, but is used for stack switching when an interrupt or exception occurs.

Fields

reserved_1: u32

privilege_stack_table: [VirtAddr; 3]

The full 64-bit canonical forms of the stack pointers (RSP) for privilege levels 0-2. The stack pointers used when a privilege level change occurs from a lower privilege level to a higher one.

reserved_2: u64

interrupt_stack_table: [VirtAddr; 7]

The full 64-bit canonical forms of the interrupt stack table (IST) pointers. The stack pointers used when an entry in the Interrupt Descriptor Table has an IST value other than 0.

reserved_3: u64

reserved_4: u16

iomap_base: u16

The 16-bit offset to the I/O permission bit map from the 64-bit TSS base. It must not exceed 0xDFFF.

Implementations

impl TaskStateSegment

pub const fn new() -> TaskStateSegment

Creates a new TSS with zeroed privilege and interrupt stack table and an empty I/O-Permission Bitmap.

As we always set the TSS segment limit to size_of::<TaskStateSegment>() - 1, this means that iomap_base is initialized to size_of::<TaskStateSegment>().

Trait Implementations

impl Clone for TaskStateSegment

fn clone(&self) -> TaskStateSegment

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TaskStateSegment

impl Debug for TaskStateSegment

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

Formats the value using the given formatter.

impl Default for TaskStateSegment

fn default() -> TaskStateSegment

Returns the “default value” for a type.