PageTablePageMeta

ostd::mm::page_table

Struct PageTablePageMeta

pub struct PageTablePageMeta<C: PageTableConfig> {
    pub nr_children: PCell<u16>,
    pub stray: PCell<bool>,
    pub level: PagingLevel,
    pub lock: PAtomicU8,
    pub _phantom: PhantomData<C>,
}

Expand description

The metadata of any kinds of page table pages. Make sure the the generic parameters don’t effect the memory layout.

Fields§

§nr_children: PCell<u16>

The number of valid PTEs. It is mutable if the lock is held.

§stray: PCell<bool>

If the page table is detached from its parent.

A page table can be detached from its parent while still being accessed, since we use a RCU scheme to recycle page tables. If this flag is set, it means that the parent is recycling the page table.

§level: PagingLevel

The level of the page table page. A page table page cannot be referenced by page tables of different levels.

§lock: PAtomicU8

The lock for the page table page.

§_phantom: PhantomData<C>

Implementations§

impl<C: PageTableConfig> PageTablePageMeta<C>

pub exec fn get_stray(&self) -> PCell<bool>

pub open spec fn into_spec(self) -> StoredPageTablePageMeta

{
    StoredPageTablePageMeta {
        nr_children: self.nr_children,
        stray: self.stray,
        level: self.level,
        lock: self.lock,
    }
}

pub exec fn into(self) -> res : StoredPageTablePageMeta

ensures

res == self.into_spec(),

impl<C: PageTableConfig> PageTablePageMeta<C>

pub exec fn new(level: PagingLevel) -> Self

Trait Implementations§

impl<C: PageTableConfig> AnyFrameMeta for PageTablePageMeta<C>

exec fn on_drop(&mut self)

exec fn is_untyped(&self) -> bool

uninterp fn vtable_ptr(&self) -> usize

impl<C: PageTableConfig> OwnerOf for PageTablePageMeta<C>

open spec fn wf(self, owner: Self::Owner) -> bool

{
    &&& self.nr_children.id() == owner.nr_children.id()
    &&& self.stray.id() == owner.stray.id()
    &&& 0 <= owner.nr_children.value() <= NR_ENTRIES()

}

type Owner = PageMetaOwner

The owner of the concrete type. The Owner must implement Inv, indicating that it must has a consistent state.

impl<C: PageTableConfig> Repr<MetaSlot> for PageTablePageMeta<C>

uninterp fn wf(r: MetaSlot) -> bool

uninterp fn to_repr_spec(self) -> MetaSlot

exec fn to_repr(self) -> MetaSlot

uninterp fn from_repr_spec(r: MetaSlot) -> Self

exec fn from_repr(r: MetaSlot) -> Self

exec fn from_borrowed<'a>(r: &'a MetaSlot) -> &'a Self

proof fn from_to_repr(self)

proof fn to_from_repr(r: MetaSlot)

proof fn to_repr_wf(self)

Auto Trait Implementations§

impl<C> !Freeze for PageTablePageMeta<C>

impl<C> !RefUnwindSafe for PageTablePageMeta<C>

impl<C> Send for PageTablePageMeta<C>

impl<C> Sync for PageTablePageMeta<C>

impl<C> Unpin for PageTablePageMeta<C>
where C: Unpin,

impl<C> UnwindSafe for PageTablePageMeta<C>
where C: UnwindSafe,

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, VERUS_SPEC__A> FromSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: From<T>,

fn obeys_from_spec() -> bool

fn from_spec(v: T) -> VERUS_SPEC__A

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T, VERUS_SPEC__A> IntoSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: Into<T>,

fn obeys_into_spec() -> bool

fn into_spec(self) -> T

impl<T, U> IntoSpecImpl<U> for T
where U: From<T>,

fn obeys_into_spec() -> bool

fn into_spec(self) -> U

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, VERUS_SPEC__A> TryFromSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: TryFrom<T>,

fn obeys_try_from_spec() -> bool

fn try_from_spec( v: T, ) -> Result<VERUS_SPEC__A, <VERUS_SPEC__A as TryFrom<T>>::Error>

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

impl<T, VERUS_SPEC__A> TryIntoSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: TryInto<T>,

fn obeys_try_into_spec() -> bool

fn try_into_spec(self) -> Result<T, <VERUS_SPEC__A as TryInto<T>>::Error>

impl<T, U> TryIntoSpecImpl<U> for T
where U: TryFrom<T>,

fn obeys_try_into_spec() -> bool

fn try_into_spec(self) -> Result<U, <U as TryFrom<T>>::Error>