Fix issue #123

rcore-os · May 31, 2023 · 7a73d4e · 7a73d4e
1 parent 173f401
commit 7a73d4e
Showing 1 changed file with 10 additions and 2 deletions.
diff --git a/os/src/mm/address.rs b/os/src/mm/address.rs
@@ -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)