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49 lines
1.3 KiB
49 lines
1.3 KiB
use arch::x86_64::memory::Frame;
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pub struct Entry(u64);
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impl Entry {
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pub fn is_unused(&self) -> bool {
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self.0 == 0
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}
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pub fn set_unused(&mut self) {
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self.0 = 0;
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}
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pub fn flags(&self) -> EntryFlags {
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EntryFlags::from_bits_truncate(self.0)
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}
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pub fn pointed_frame(&self) -> Option<Frame> {
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if self.flags().contains(PRESENT) {
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Some(Frame::containing_address(
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self.0 as usize & 0x000fffff_fffff000
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))
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} else {
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None
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}
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}
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pub fn set(&mut self, frame: Frame, flags: EntryFlags) {
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// Frame physical address must be page-aligned and smaller than 2^52
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assert!(frame.start_address() & !0x000fffff_fffff000 == 0);
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self.0 = (frame.start_address() as u64) | flags.bits();
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}
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}
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bitflags! {
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pub struct EntryFlags: u64 {
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const PRESENT = 1 << 0;
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const WRITABLE = 1 << 1;
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const USER_ACCESSIBLE = 1 << 2;
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const WRITE_THROUGH = 1 << 3;
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const NO_CACHE = 1 << 4;
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const ACCESSED = 1 << 5;
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const DIRTY = 1 << 6;
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const HUGE_PAGE = 1 << 7;
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const GLOBAL = 1 << 8;
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const NO_EXECUTE = 1 << 63;
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}
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}
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