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Fix issue #123

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This commit is contained in:
Yifan Wu 2023-05-31 21:17:53 +08:00
parent fbd74f8a96
commit 8ac0534091
1 changed files with 10 additions and 2 deletions
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12
os/src/mm/address.rs
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@ -101,7 +101,11 @@ impl VirtAddr {
VirtPageNum(self.0 / PAGE_SIZE)
}
pub fn ceil(&self) -> VirtPageNum {
VirtPageNum((self.0 - 1 + PAGE_SIZE) / PAGE_SIZE)
if self.0 == 0 {
VirtPageNum(0)
} else {
VirtPageNum((self.0 - 1 + PAGE_SIZE) / PAGE_SIZE)
}
}
pub fn page_offset(&self) -> usize {
self.0 & (PAGE_SIZE - 1)
@ -126,7 +130,11 @@ impl PhysAddr {
PhysPageNum(self.0 / PAGE_SIZE)
}
pub fn ceil(&self) -> PhysPageNum {
PhysPageNum((self.0 - 1 + PAGE_SIZE) / PAGE_SIZE)
if self.0 == 0 {
PhysPageNum(0)
} else {
PhysPageNum((self.0 - 1 + PAGE_SIZE) / PAGE_SIZE)
}
}
pub fn page_offset(&self) -> usize {
self.0 & (PAGE_SIZE - 1)