Struct PageTableGuard Copy item path

impl<'rcu, C: PageTableConfig> PageTableGuard<'rcu, C>

pub(super) fn entry(&mut self, idx: usize) -> Entry<'_, 'rcu, C>

Borrows an entry in the node at a given index.

§Panics

Panics if the index is not within the bound of nr_subpage_per_huge<C>.

pub(super) fn nr_children(&self) -> u16

Gets the number of valid PTEs in the node.

pub(super) fn stray_mut(&mut self) -> &mut bool

Returns if the page table node is detached from its parent.

pub(super) unsafe fn read_pte(&self, idx: usize) -> C::E

Reads a non-owning PTE at the given index.

A non-owning PTE means that it does not account for a reference count of the a page if the PTE points to a page. The original PTE still owns the child page.

idx should be bounded by the bounds of the node.

pub(super) unsafe fn write_pte(&mut self, idx: usize, pte: C::E)

Writes a page table entry at a given index.

This operation will leak the old child if the old PTE is present.

idx should be bounded by the bound of the node.
The Child represented by pte, form the perspective of PageTableConfig and the paging level, should be valid.
The page table node will have the ownership of the Child after this method.

fn nr_children_mut(&mut self) -> &mut u16

Gets the mutable reference to the number of valid PTEs in the node.

Methods from Deref<Target = Frame<M>>§

pub fn meta(&self) -> &M

Gets the metadata of this page.

pub fn start_paddr(&self) -> Paddr

Gets the physical address of the start of the frame.

pub fn map_level(&self) -> PagingLevel

Gets the map level of this page.

This is the level of the page table entry that maps the frame, which determines the size of the frame.

Currently, the level is always 1, which means the frame is a regular page frame.

pub fn size(&self) -> usize

Gets the size of this page in bytes.

pub fn dyn_meta(&self) -> &dyn AnyFrameMeta

Gets the dyncamically-typed metadata of this frame.

If the type is known at compile time, use Frame::meta instead.

pub fn reference_count(&self) -> u64

Gets the reference count of the frame.

It returns the number of all references to the frame, including all the existing frame handles (Frame, Frame<dyn AnyFrameMeta>), and all the mappings in the page table that points to the frame.

§Safety

The function is safe to call, but using it requires extra care. The reference count can be changed by other threads at any time including potentially between calling this method and acting on the result.

pub fn borrow(&self) -> FrameRef<'_, M>

Borrows a reference from the given frame.

fn slot(&self) -> &MetaSlot

pub(super) fn level(&self) -> PagingLevel

pub(crate) unsafe fn activate(&self)

Activates the page table assuming it is a root page table.

Here we ensure not dropping an active page table by making a processor a page table owner. When activating a page table, the reference count of the last activated page table is decremented. And that of the current page table is incremented.

§Safety

The caller must ensure that the page table to be activated has proper mappings for the kernel and has the correct const parameters matching the current CPU.

§Panics

Only top-level page tables can be activated using this function.

The page table should be valid by having proper mapping and level.

pub(super) unsafe fn first_activate(&self)

Activates the (root) page table assuming it is the first activation.

It will not try dropping the last activate page table. It is the same with Self::activate() in other senses.

This function should be called only once per system.
The page table, from the perspective of mapping and level, should be valid.

Trait Implementations§

impl<'rcu, C: Debug + PageTableConfig> Debug for PageTableGuard<'rcu, C>

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

Formats the value using the given formatter. Read more

impl<'rcu, C: PageTableConfig> Deref for PageTableGuard<'rcu, C>

type Target = FrameRef<'rcu, PageTablePageMeta<C>>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<C: PageTableConfig> Drop for PageTableGuard<'_, C>

fn drop(&mut self)

Executes the destructor for this type. Read more

Auto Trait Implementations§

impl<'rcu, C> !UnwindSafe for PageTableGuard<'rcu, C>

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