Struct axhal::arch::GdtStruct

#[repr(align(16))]
pub struct GdtStruct { /* private fields */ }

A wrapper of the Global Descriptor Table (GDT) with maximum 16 entries.

Implementations

impl GdtStruct

pub const KCODE32_SELECTOR: SegmentSelector = _

Kernel code segment for 32-bit mode.

pub const KCODE64_SELECTOR: SegmentSelector = _

Kernel code segment for 64-bit mode.

pub const KDATA_SELECTOR: SegmentSelector = _

Kernel data segment.

pub const UCODE32_SELECTOR: SegmentSelector = _

User code segment for 32-bit mode.

pub const UDATA_SELECTOR: SegmentSelector = _

User data segment.

pub const UCODE64_SELECTOR: SegmentSelector = _

User code segment for 64-bit mode.

pub const TSS_SELECTOR: SegmentSelector = _

TSS segment.

pub fn new(tss: &'static TaskStateSegment) -> Self

Constructs a new GDT struct that filled with the default segment descriptors, including the given TSS segment.

pub fn pointer(&self) -> DescriptorTablePointer

Returns the GDT pointer (base and limit) that can be used in lgdt instruction.

pub unsafe fn load(&'static self)

Loads the GDT into the CPU (executes the lgdt instruction), and updates the code segment register (CS).

Safety

This function is unsafe because it manipulates the CPU’s privileged states.

pub unsafe fn load_tss(&'static self)

Loads the TSS into the CPU (executes the ltr instruction).

Safety

This function is unsafe because it manipulates the CPU’s privileged states.

Trait Implementations

impl Debug for GdtStruct

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

Formats the value using the given formatter.