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PageTable

Struct PageTable 

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pub struct PageTable<T: TableMeta, A: FrameAllocator> { /* private fields */ }

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impl<T: TableMeta, A: FrameAllocator> PageTable<T, A>

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pub const VALID_BITS: usize = Frame<T, A>::PT_VALID_BITS

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pub fn new(allocator: A) -> PagingResult<Self>

创建一个新的页表

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pub fn valid_bits(&self) -> usize

Methods from Deref<Target = PageTableRef<T, A>>§

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pub fn map(&mut self, config: &MapConfig) -> PagingResult

映射虚拟地址范围到物理地址范围

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pub fn unmap(&mut self, start_vaddr: VirtAddr, size: usize) -> PagingResult<()>

取消映射虚拟地址范围

§参数
  • start_vaddr: 要取消映射的起始虚拟地址
  • size: 要取消映射的大小(字节)
§返回值
  • Ok(()): 取消映射成功
  • Err(PagingError): 取消映射失败
§行为
  • 清除指定虚拟地址范围内的所有页表项
  • 自动回收空的子页表帧
  • 支持大页和普通页面的取消映射
  • 根据配置刷新TLB
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pub fn unmap_with_config(&mut self, config: &UnmapConfig) -> PagingResult<()>

使用配置对象取消映射

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pub fn walk_all(&self, config: WalkConfig) -> PageTableWalker<'_, T, A>

创建页表遍历迭代器

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pub fn walk( &self, start_vaddr: VirtAddr, end_vaddr: VirtAddr, ) -> impl Iterator<Item = PteInfo<T::P>> + '_

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pub fn walk_valid(&self) -> impl Iterator<Item = PteInfo<T::P>> + '_

遍历所有有效的最终映射页表项(过滤掉无效项和中间级别的页表指针)

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pub unsafe fn deallocate(&mut self)

释放页表占用的所有页表帧

与destroy()不同,这个方法保留PageTable结构, 但释放所有关联的页表帧。调用后PageTable不再可用。

释放行为:

  • 释放所有页表帧
  • 清除所有页表项(设为invalid)
  • 不释放映射的物理页(数据页/大页)
§Safety

调用者必须确保:

  • 没有其他代码在访问这个页表
  • 没有CPU正在使用这个页表进行地址翻译
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pub fn deallocate_range( &mut self, start_vaddr: VirtAddr, end_vaddr: VirtAddr, ) -> PagingResult

释放页表中的指定映射区域

释放指定虚拟地址范围内的所有页表项和子页表帧 在释放前将相关PTE设为invalid

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pub fn translate(&self, vaddr: VirtAddr) -> PagingResult<(PhysAddr, T::P)>

通过虚拟地址查询页表项

§参数
  • vaddr: 要查询的虚拟地址
§返回值
  • Ok(T::P): 找到的页表项,包含物理地址信息
  • Err(PagingError): 查询失败,原因可能包括:
    • 地址未映射
    • 页表项无效
    • 页表层次结构错误
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pub fn translate_phys(&self, vaddr: VirtAddr) -> PagingResult<PhysAddr>

通过虚拟地址查询物理地址(便利方法)

§参数
  • vaddr: 要查询的虚拟地址
§返回值
  • Ok(PhysAddr): 找到的物理地址
  • Err(PagingError): 查询失败
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pub fn is_mapped(&self, vaddr: VirtAddr) -> bool

检查虚拟地址是否已映射

这是一个便利方法,用于快速检查地址是否已映射而不需要获取页表项

§参数
  • vaddr: 要检查的虚拟地址
§返回值
  • true: 地址已映射
  • false: 地址未映射
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pub fn root_paddr(&self) -> PhysAddr

获取页表的根帧物理地址

Trait Implementations§

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impl<T: TableMeta, A: FrameAllocator> Deref for PageTable<T, A>

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type Target = PageTableRef<T, A>

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl<T: TableMeta, A: FrameAllocator> DerefMut for PageTable<T, A>

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl<T: TableMeta, A: FrameAllocator> Drop for PageTable<T, A>

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<T: TableMeta, A: FrameAllocator> PageTableOp for PageTable<T, A>

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fn addr(&self) -> PhysAddr

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fn map(&mut self, config: &MapConfig) -> PagingResult

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fn unmap(&mut self, virt_start: VirtAddr, size: usize) -> PagingResult

Auto Trait Implementations§

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impl<T, A> Freeze for PageTable<T, A>
where A: Freeze,

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impl<T, A> RefUnwindSafe for PageTable<T, A>

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impl<T, A> Send for PageTable<T, A>

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impl<T, A> Sync for PageTable<T, A>

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impl<T, A> Unpin for PageTable<T, A>
where A: Unpin, T: Unpin,

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impl<T, A> UnwindSafe for PageTable<T, A>
where A: UnwindSafe, T: UnwindSafe,

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

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type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
The target type on which the method may be called.
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.