Struct x86_64::structures::gdt::GlobalDescriptorTable

pub struct GlobalDescriptorTable { /* fields omitted */ }

A 64-bit mode global descriptor table (GDT).

In 64-bit mode, segmentation is not supported. The GDT is used nonetheless, for example for switching between user and kernel mode or for loading a TSS.

The GDT has a fixed size of 8 entries, trying to add more entries will panic.

Methods

impl GlobalDescriptorTable

pub fn new() -> GlobalDescriptorTable

Creates an empty GDT.

pub fn add_entry(&mut self, entry: Descriptor) -> SegmentSelector

Adds the given segment descriptor to the GDT, returning the segment selector.

Panics if the GDT has no free entries left.

pub fn load(&'static self)

Loads the GDT in the CPU using the lgdt instruction.

Trait Implementations

impl Debug for GlobalDescriptorTable

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

Formats the value using the given formatter.

impl Clone for GlobalDescriptorTable

fn clone(&self) -> GlobalDescriptorTable

Returns a copy of the value.

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

Performs copy-assignment from source.