Struct PageMapper 

pub struct PageMapper { /* private fields */ }

Page mapper for modifying page tables

Implementations

impl PageMapper

pub unsafe fn new(l4_table: *mut PageTable) -> Self

Create a new page mapper (unsafe: requires valid mapped L4 table)

Safety

The l4_table pointer must:

• Point to a valid, mapped page table
• Remain valid for the lifetime of the PageMapper
• Not be accessed through any other means while this exists

pub unsafe fn new_with_recursive( l4_table: *mut PageTable, recursive_index: PageTableIndex, ) -> Self

Create a new page mapper with recursive mapping

Safety

Same requirements as new, plus:

• The recursive_index must be set up for recursive mapping

pub fn map_page( &mut self, page: VirtualAddress, frame: FrameNumber, flags: PageFlags, allocator: &mut impl FrameAllocator, ) -> Result<(), KernelError>

Map a page to a frame

pub fn translate_page( &self, page: VirtualAddress, ) -> Result<(FrameNumber, PageFlags), KernelError>

Look up the physical frame mapped at a virtual address.

Walks the page table hierarchy and returns the frame number and flags of the L1 (leaf) entry if the page is present at all four levels.

pub fn update_page_flags( &mut self, page: VirtualAddress, new_flags: PageFlags, ) -> Result<PageFlags, KernelError>

Update the flags on an existing page table entry without changing the mapped frame.

Returns the old flags on success.

pub fn unmap_page( &mut self, page: VirtualAddress, ) -> Result<FrameNumber, KernelError>

Unmap a page