Struct PageTable

#[repr(C)]
pub struct PageTable(/* private fields */);

Page Table

This is just the page table defination. The implementation of the page table in the specific architecture mod. Such as: x86_64/page_table.rs riscv64/page_table/sv39.rs aarch64/page_table.rs loongarch64/page_table.rs

Implementations

impl PageTable

pub const PAGE_SIZE: usize = 4_096usize

The size of the page for this platform.

pub const PAGE_LEVEL: usize = 4usize

pub const PTE_NUM_IN_PAGE: usize = 512usize

pub fn restore(&self)

pub fn current() -> Self

pub fn change(&self)

impl PageTable

pub const fn root(&self) -> PhysAddr

Get the root Physical Page

pub fn map_page( &self, vaddr: VirtAddr, paddr: PhysAddr, flags: MappingFlags, _size: MappingSize, )

Mapping a page to specific virtual page (user space address).

Ensure that PageTable is which you want to map. vpn: Virtual page will be mapped. ppn: Physical page. flags: Mapping flags, include Read, Write, Execute and so on. size: MappingSize. Just support 4KB page currently.

pub fn map_kernel( &self, vaddr: VirtAddr, paddr: PhysAddr, flags: MappingFlags, _size: MappingSize, )

Mapping a page to specific address(kernel space address).

TODO: This method is not implemented. TIPS: If we mapped to kernel, the page will be shared between different pagetable.

Ensure that PageTable is which you want to map. vpn: Virtual page will be mapped. ppn: Physical page. flags: Mapping flags, include Read, Write, Execute and so on. size: MappingSize. Just support 4KB page currently.

How to implement shared.

pub fn unmap_page(&self, vaddr: VirtAddr)

Unmap a page from specific virtual page (user space address).

Ensure the virtual page is exists. vpn: Virtual address.

pub fn translate(&self, vaddr: VirtAddr) -> Option<(PhysAddr, MappingFlags)>

Translate a virtual adress to a physical address and mapping flags.

Return None if the vaddr isn’t mapped. vpn: The virtual address will be translated.

pub fn release(&self)

Release the page table entry.

The page table entry in the user space address will be released. Page Table Wikipedia. You don’t need to care about this if you just want to use.

Trait Implementations

impl Clone for PageTable

fn clone(&self) -> PageTable

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PageTable

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

Formats the value using the given formatter.

impl Copy for PageTable