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Now PageTable::unmap calls PageTable::find_pte instead of PageTable::find_pte_create.

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This commit is contained in:
Yifan Wu 2022-01-13 17:06:15 -08:00
parent 2793aa60e5
commit 9ff45a2e7a
1 changed files with 6 additions and 5 deletions
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9
os/src/mm/page_table.rs
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@ -102,12 +102,12 @@ impl PageTable {
}
result
}
fn find_pte(&self, vpn: VirtPageNum) -> Option<&PageTableEntry> {
fn find_pte(&self, vpn: VirtPageNum) -> Option<&mut PageTableEntry> {
let idxs = vpn.indexes();
let mut ppn = self.root_ppn;
let mut result: Option<&PageTableEntry> = None;
let mut result: Option<&mut PageTableEntry> = None;
for i in 0..3 {
let pte = &ppn.get_pte_array()[idxs[i]];
let pte = &mut ppn.get_pte_array()[idxs[i]];
if i == 2 {
result = Some(pte);
break;
@ -127,7 +127,7 @@ impl PageTable {
}
#[allow(unused)]
pub fn unmap(&mut self, vpn: VirtPageNum) {
let pte = self.find_pte_create(vpn).unwrap();
let pte = self.find_pte(vpn).unwrap();
assert!(pte.is_valid(), "vpn {:?} is invalid before unmapping", vpn);
*pte = PageTableEntry::empty();
}
@ -199,3 +199,4 @@ pub fn translated_refmut<T>(token: usize, ptr: *mut T) -> &'static mut T {
//println!("translated_refmut: before translate_va");
page_table.translate_va(VirtAddr::from(va)).unwrap().get_mut()
}