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Change semantics of start_address and containing_address

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The page numbers now respect the memory hole between higher and lower half.
This commit is contained in:
Philipp Oppermann
2015-12-05 01:01:33 +01:00
parent c52f58cc4c
commit cdaad86a06
1 changed files with 5 additions and 14 deletions
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19
src/memory/paging/mod.rs
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@@ -40,22 +40,13 @@ pub struct Page {
impl Page {
fn containing_address(address: VirtualAddress) -> Page {
match address {
addr if addr < 0o_400_000_000_000_0000 => Page { number: addr / PAGE_SIZE },
addr if addr >= 0o177777_400_000_000_000_0000 => {
Page { number: (address / PAGE_SIZE) & 0o_777_777_777_777 }
}
_ => panic!("invalid address: 0x{:x}", address),
}
assert!(address < 0x0000_8000_0000_0000 || address >= 0xffff_8000_0000_0000,
"invalid address: 0x{:x}", address);
Page { number: address / PAGE_SIZE }
}
pub fn start_address(&self) -> VirtualAddress {
if self.number >= 0x800000000 {
// sign extension necessary
(self.number << 12) | 0xffff_000000000000
} else {
self.number << 12
}
fn start_address(&self) -> VirtualAddress {
self.number * PAGE_SIZE
}
fn p4_index(&self) -> usize {