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45 lines
1.2 KiB
45 lines
1.2 KiB
use super::*;
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#[derive(Debug, Clone)]
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pub struct Delay<T: FrameAllocator> {
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flags: MemoryAttr,
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allocator: T,
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}
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impl<T: FrameAllocator> MemoryHandler for Delay<T> {
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fn box_clone(&self) -> Box<MemoryHandler> {
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Box::new(self.clone())
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}
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fn map(&self, pt: &mut PageTable, addr: VirtAddr) {
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let entry = pt.map(addr, 0);
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entry.set_present(false);
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entry.update();
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}
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fn unmap(&self, pt: &mut PageTable, addr: VirtAddr) {
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let entry = pt.get_entry(addr).expect("failed to get entry");
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if entry.present() {
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self.allocator.dealloc(entry.target());
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pt.unmap(addr);
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}
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}
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fn page_fault_handler(&self, pt: &mut PageTable, addr: VirtAddr) -> bool {
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let entry = pt.get_entry(addr).expect("failed to get entry");
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if entry.present() {
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// not a delay case
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return false;
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}
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let frame = self.allocator.alloc().expect("failed to alloc frame");
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entry.set_target(frame);
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self.flags.apply(entry);
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true
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}
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}
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impl<T: FrameAllocator> Delay<T> {
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pub fn new(flags: MemoryAttr, allocator: T) -> Self {
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Delay { flags, allocator }
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}
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} |