Enum x86_64::structures::gdt::Descriptor

pub enum Descriptor {
    UserSegment(u64),
    SystemSegment(u64, u64),
}

A 64-bit mode segment descriptor.

Segmentation is no longer supported in 64-bit mode, so most of the descriptor contents are ignored.

Variants

UserSegment(u64)

Tuple Fields

0: u64

Descriptor for a code or data segment.

Since segmentation is no longer supported in 64-bit mode, almost all of code and data descriptors is ignored. Only some flags are still used.

SystemSegment(u64, u64)

Tuple Fields

0: u64

1: u64

A system segment descriptor such as a LDT or TSS descriptor.

Implementations

impl Descriptor

pub const fn kernel_code_segment() -> Descriptor

Creates a segment descriptor for a 64-bit kernel code segment. Suitable for use with syscall or 64-bit sysenter.

pub const fn kernel_data_segment() -> Descriptor

Creates a segment descriptor for a kernel data segment (32-bit or 64-bit). Suitable for use with syscall or sysenter.

pub const fn user_data_segment() -> Descriptor

Creates a segment descriptor for a ring 3 data segment (32-bit or 64-bit). Suitable for use with sysret or sysexit.

pub const fn user_code_segment() -> Descriptor

Creates a segment descriptor for a 64-bit ring 3 code segment. Suitable for use with sysret or sysexit.

pub fn tss_segment(tss: &'static TaskStateSegment) -> Descriptor

Creates a TSS system descriptor for the given TSS.

Trait Implementations

impl Clone for Descriptor

fn clone(&self) -> Descriptor

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Descriptor

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

Formats the value using the given formatter.