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Use the HUGE/PAT bit to track the validity of x86 PTEs

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Zhang Junyang
2024-10-12 21:53:03 +08:00
committed by Tate, Hongliang Tian
parent b269118c9a
commit dc7e0d7a63
4 changed files with 30 additions and 15 deletions
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8
ostd/src/mm/page_table/mod.rs
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@ -327,6 +327,10 @@ pub trait PageTableEntryTrait: Clone + Copy + Debug + Default + Pod + Sized + Sy
}
/// If the flags are present with valid mappings.
///
/// For PTEs created by [`Self::new_absent`], this method should return
/// false. And for PTEs created by [`Self::new_page`] or [`Self::new_pt`]
/// and modified with [`Self::set_prop`] this method should return true.
fn is_present(&self) -> bool;
/// Create a new PTE with the given physical address and flags that map to a page.
@ -343,6 +347,10 @@ pub trait PageTableEntryTrait: Clone + Copy + Debug + Default + Pod + Sized + Sy
fn prop(&self) -> PageProperty;
/// Set the page property of the PTE.
///
/// This will be only done if the PTE is present. If not, this method will
/// do nothing.
fn set_prop(&mut self, prop: PageProperty);
/// If the PTE maps a page rather than a child page table.