Struct os::mm::PageTable

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

page table structure

Fields

root_ppn: PhysPageNum

frames: Vec<FrameTracker>

Implementations

impl PageTable

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

pub fn new() -> Self

Create a new page table

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 PageTableEntry by VirtPageNum, create a frame for a 4KB page table if not exist

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

Find PageTableEntry by VirtPageNum

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

set the map between virtual page number and physical page number

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

remove the map between virtual page number and physical page number

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

get the page table entry from the virtual page number

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

get the physical address from the virtual address

pub fn token(&self) -> usize

get the token from the page table