Struct MappedPageTable

pub struct MappedPageTable<'a, P: PageTableFrameMapping> { /* private fields */ }

A Mapper implementation that relies on a PhysAddr to VirtAddr conversion function.

This type requires that the all physical page table frames are mapped to some virtual address. Normally, this is done by mapping the complete physical address space into the virtual address space at some offset. Other mappings between physical and virtual memory are possible too, as long as they can be calculated as an PhysAddr to VirtAddr closure.

Implementations

impl<'a, P: PageTableFrameMapping> MappedPageTable<'a, P>

pub unsafe fn new( level_4_table: &'a mut PageTable, page_table_frame_mapping: P, ) -> Self

Creates a new MappedPageTable that uses the passed PageTableFrameMapping for converting virtual to physical addresses.

Safety

This function is unsafe because the caller must guarantee that the passed page_table_frame_mapping PageTableFrameMapping is correct. Also, the passed level_4_table must point to the level 4 page table of a valid page table hierarchy. Otherwise this function might break memory safety, e.g. by writing to an illegal memory location.

pub fn level_4_table(&self) -> &PageTable

Returns an immutable reference to the wrapped level 4 PageTable instance.

pub fn level_4_table_mut(&mut self) -> &mut PageTable

Returns a mutable reference to the wrapped level 4 PageTable instance.

pub fn page_table_frame_mapping(&self) -> &P

Returns the PageTableFrameMapping used for converting virtual to physical addresses.

Trait Implementations

impl<'a, P: PageTableFrameMapping> CleanUp for MappedPageTable<'a, P>

unsafe fn clean_up<D>(&mut self, frame_deallocator: &mut D)

where D: FrameDeallocator<Size4KiB>,

Remove all empty P1-P3 tables

unsafe fn clean_up_addr_range<D>( &mut self, range: PageRangeInclusive, frame_deallocator: &mut D, )

where D: FrameDeallocator<Size4KiB>,

Remove all empty P1-P3 tables in a certain range

impl<'a, P: Debug + PageTableFrameMapping> Debug for MappedPageTable<'a, P>

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

Formats the value using the given formatter.

impl<'a, P: PageTableFrameMapping> Mapper<Size1GiB> for MappedPageTable<'a, P>

unsafe fn map_to_with_table_flags<A>( &mut self, page: Page<Size1GiB>, frame: PhysFrame<Size1GiB>, flags: PageTableFlags, parent_table_flags: PageTableFlags, allocator: &mut A, ) -> Result<MapperFlush<Size1GiB>, MapToError<Size1GiB>>

where A: FrameAllocator<Size4KiB> + ?Sized,

Creates a new mapping in the page table.

fn unmap( &mut self, page: Page<Size1GiB>, ) -> Result<(PhysFrame<Size1GiB>, MapperFlush<Size1GiB>), UnmapError>

Removes a mapping from the page table and returns the frame that used to be mapped.

unsafe fn update_flags( &mut self, page: Page<Size1GiB>, flags: PageTableFlags, ) -> Result<MapperFlush<Size1GiB>, FlagUpdateError>

Updates the flags of an existing mapping.

unsafe fn set_flags_p4_entry( &mut self, page: Page<Size1GiB>, flags: PageTableFlags, ) -> Result<MapperFlushAll, FlagUpdateError>

Set the flags of an existing page level 4 table entry

unsafe fn set_flags_p3_entry( &mut self, _page: Page<Size1GiB>, _flags: PageTableFlags, ) -> Result<MapperFlushAll, FlagUpdateError>

Set the flags of an existing page table level 3 entry

unsafe fn set_flags_p2_entry( &mut self, _page: Page<Size1GiB>, _flags: PageTableFlags, ) -> Result<MapperFlushAll, FlagUpdateError>

Set the flags of an existing page table level 2 entry

fn translate_page( &self, page: Page<Size1GiB>, ) -> Result<PhysFrame<Size1GiB>, TranslateError>

Return the frame that the specified page is mapped to.

unsafe fn map_to<A>( &mut self, page: Page<S>, frame: PhysFrame<S>, flags: PageTableFlags, frame_allocator: &mut A, ) -> Result<MapperFlush<S>, MapToError<S>>

where Self: Sized, A: FrameAllocator<Size4KiB> + ?Sized,

Creates a new mapping in the page table.

unsafe fn identity_map<A>( &mut self, frame: PhysFrame<S>, flags: PageTableFlags, frame_allocator: &mut A, ) -> Result<MapperFlush<S>, MapToError<S>>

where Self: Sized + Mapper<S>, A: FrameAllocator<Size4KiB> + ?Sized, S: PageSize,

Maps the given frame to the virtual page with the same address.

impl<'a, P: PageTableFrameMapping> Mapper<Size2MiB> for MappedPageTable<'a, P>

unsafe fn map_to_with_table_flags<A>( &mut self, page: Page<Size2MiB>, frame: PhysFrame<Size2MiB>, flags: PageTableFlags, parent_table_flags: PageTableFlags, allocator: &mut A, ) -> Result<MapperFlush<Size2MiB>, MapToError<Size2MiB>>

where A: FrameAllocator<Size4KiB> + ?Sized,

Creates a new mapping in the page table.

fn unmap( &mut self, page: Page<Size2MiB>, ) -> Result<(PhysFrame<Size2MiB>, MapperFlush<Size2MiB>), UnmapError>

Removes a mapping from the page table and returns the frame that used to be mapped.

unsafe fn update_flags( &mut self, page: Page<Size2MiB>, flags: PageTableFlags, ) -> Result<MapperFlush<Size2MiB>, FlagUpdateError>

Updates the flags of an existing mapping.

unsafe fn set_flags_p4_entry( &mut self, page: Page<Size2MiB>, flags: PageTableFlags, ) -> Result<MapperFlushAll, FlagUpdateError>

Set the flags of an existing page level 4 table entry

unsafe fn set_flags_p3_entry( &mut self, page: Page<Size2MiB>, flags: PageTableFlags, ) -> Result<MapperFlushAll, FlagUpdateError>

Set the flags of an existing page table level 3 entry

unsafe fn set_flags_p2_entry( &mut self, _page: Page<Size2MiB>, _flags: PageTableFlags, ) -> Result<MapperFlushAll, FlagUpdateError>

Set the flags of an existing page table level 2 entry

fn translate_page( &self, page: Page<Size2MiB>, ) -> Result<PhysFrame<Size2MiB>, TranslateError>

Return the frame that the specified page is mapped to.

unsafe fn map_to<A>( &mut self, page: Page<S>, frame: PhysFrame<S>, flags: PageTableFlags, frame_allocator: &mut A, ) -> Result<MapperFlush<S>, MapToError<S>>

where Self: Sized, A: FrameAllocator<Size4KiB> + ?Sized,

Creates a new mapping in the page table.

unsafe fn identity_map<A>( &mut self, frame: PhysFrame<S>, flags: PageTableFlags, frame_allocator: &mut A, ) -> Result<MapperFlush<S>, MapToError<S>>

where Self: Sized + Mapper<S>, A: FrameAllocator<Size4KiB> + ?Sized, S: PageSize,

Maps the given frame to the virtual page with the same address.

impl<'a, P: PageTableFrameMapping> Mapper<Size4KiB> for MappedPageTable<'a, P>

unsafe fn map_to_with_table_flags<A>( &mut self, page: Page<Size4KiB>, frame: PhysFrame<Size4KiB>, flags: PageTableFlags, parent_table_flags: PageTableFlags, allocator: &mut A, ) -> Result<MapperFlush<Size4KiB>, MapToError<Size4KiB>>

where A: FrameAllocator<Size4KiB> + ?Sized,

Creates a new mapping in the page table.

fn unmap( &mut self, page: Page<Size4KiB>, ) -> Result<(PhysFrame<Size4KiB>, MapperFlush<Size4KiB>), UnmapError>

Removes a mapping from the page table and returns the frame that used to be mapped.

unsafe fn update_flags( &mut self, page: Page<Size4KiB>, flags: PageTableFlags, ) -> Result<MapperFlush<Size4KiB>, FlagUpdateError>

Updates the flags of an existing mapping.

unsafe fn set_flags_p4_entry( &mut self, page: Page<Size4KiB>, flags: PageTableFlags, ) -> Result<MapperFlushAll, FlagUpdateError>

Set the flags of an existing page level 4 table entry

unsafe fn set_flags_p3_entry( &mut self, page: Page<Size4KiB>, flags: PageTableFlags, ) -> Result<MapperFlushAll, FlagUpdateError>

Set the flags of an existing page table level 3 entry

unsafe fn set_flags_p2_entry( &mut self, page: Page<Size4KiB>, flags: PageTableFlags, ) -> Result<MapperFlushAll, FlagUpdateError>

Set the flags of an existing page table level 2 entry

fn translate_page( &self, page: Page<Size4KiB>, ) -> Result<PhysFrame<Size4KiB>, TranslateError>

Return the frame that the specified page is mapped to.

unsafe fn map_to<A>( &mut self, page: Page<S>, frame: PhysFrame<S>, flags: PageTableFlags, frame_allocator: &mut A, ) -> Result<MapperFlush<S>, MapToError<S>>

where Self: Sized, A: FrameAllocator<Size4KiB> + ?Sized,

Creates a new mapping in the page table.

unsafe fn identity_map<A>( &mut self, frame: PhysFrame<S>, flags: PageTableFlags, frame_allocator: &mut A, ) -> Result<MapperFlush<S>, MapToError<S>>

where Self: Sized + Mapper<S>, A: FrameAllocator<Size4KiB> + ?Sized, S: PageSize,

Maps the given frame to the virtual page with the same address.

impl<'a, P: PageTableFrameMapping> Translate for MappedPageTable<'a, P>

fn translate(&self, addr: VirtAddr) -> TranslateResult

Return the frame that the given virtual address is mapped to and the offset within that frame.

fn translate_addr(&self, addr: VirtAddr) -> Option<PhysAddr>

Translates the given virtual address to the physical address that it maps to.