Struct EagerPager 

pub struct EagerPager {
    mappings: BTreeMap<Va, Mapping>,
}

EagerPager is a struct that implements the Pager trait. It represents a pager strategy that is responsible for eager memory paging.

Fields

mappings: BTreeMap<Va, Mapping>

Trait Implementations

impl Pager for EagerPager

fn new() -> Self

Creates a new instance of EagerPager.

This constructor initializes an empty EagerPager struct.

fn mmap( &mut self, page_table: &mut PageTable, addr: Va, size: usize, prot: Permission, file: Option<&RegularFile>, offset: usize, ) -> Result<usize, KernelError>

Memory map function (mmap) for eager paging.

This function maps the given memory region into page table. Returns an address for the mapped area.

fn munmap( &mut self, page_table: &mut PageTable, addr: Va, ) -> Result<usize, KernelError>

Memory unmap function (munmap) for eager paging.

This function would unmap a previously mapped memory region, releasing any associated resources.

fn get_user_page( &mut self, page_table: &mut PageTable, addr: Va, ) -> Option<(PageRef<'_>, Permission)>

Find a mapped page at the given virtual address.

This function searches for a memory page mapped at addr and, if found, returns a tuple of PageRef to the page and its corresponding Permission flags.

fn access_ok(&self, va: Va, is_write: bool) -> bool

Checks whether access to the given virtual address is permitted.

This function verifies that a virtual address va is part of a valid memory mapping and that the requested access type (read or write) is allowed by the page’s protection flags.