Struct os::mm::PageTable

pub struct PageTable {
    root_ppn: PhysPageNum,
    frames: Vec<FrameTracker>,
}

Record root ppn and has the same lifetime as 1 and 2 level PageTableEntry

Fields

root_ppn: PhysPageNum

frames: Vec<FrameTracker>

Implementations

impl PageTable

Assume that it won’t oom when creating/mapping.

pub fn new() -> Self

Create an empty PageTable

pub fn from_token(satp: usize) -> Self

Temporarily used to get arguments from user space.

fn find_pte_create(&mut self, vpn: VirtPageNum) -> Option<&mut PageTableEntry>

Find phsical address by virtual address, create a frame if not exist

fn find_pte(&self, vpn: VirtPageNum) -> Option<&mut PageTableEntry>

Find phsical address by virtual address

pub fn map(&mut self, vpn: VirtPageNum, ppn: PhysPageNum, flags: PTEFlags)

Create a mapping form vpn to ppn

pub fn unmap(&mut self, vpn: VirtPageNum)

Delete a mapping form vpn

pub fn translate(&self, vpn: VirtPageNum) -> Option<PageTableEntry>

Translate VirtPageNum to PageTableEntry

pub fn translate_va(&self, va: VirtAddr) -> Option<PhysAddr>

Translate VirtAddr to PhysAddr

pub fn token(&self) -> usize

Get root ppn