44 lines
1.5 KiB
Rust
44 lines
1.5 KiB
Rust
//! Temporarily map a page
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//! From [Phil Opp's Blog](http://os.phil-opp.com/remap-the-kernel.html)
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use memory::Frame;
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use super::{ActivePageTable, Page, VirtualAddress};
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use super::entry::EntryFlags;
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use super::table::{Table, Level1};
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pub struct TemporaryPage {
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page: Page,
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}
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impl TemporaryPage {
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pub fn new(page: Page) -> TemporaryPage {
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TemporaryPage {
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page: page,
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}
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}
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pub fn start_address (&self) -> VirtualAddress {
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self.page.start_address()
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}
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/// Maps the temporary page to the given frame in the active table.
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/// Returns the start address of the temporary page.
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pub fn map(&mut self, frame: Frame, flags: EntryFlags, active_table: &mut ActivePageTable) -> VirtualAddress {
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assert!(active_table.translate_page(self.page).is_none(), "temporary page is already mapped");
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active_table.map_to(self.page, frame, flags);
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self.page.start_address()
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}
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/// Maps the temporary page to the given page table frame in the active
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/// table. Returns a reference to the now mapped table.
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pub fn map_table_frame(&mut self, frame: Frame, flags: EntryFlags, active_table: &mut ActivePageTable) -> &mut Table<Level1> {
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unsafe { &mut *(self.map(frame, flags, active_table).get() as *mut Table<Level1>) }
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}
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/// Unmaps the temporary page in the active table.
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pub fn unmap(&mut self, active_table: &mut ActivePageTable) {
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active_table.unmap(self.page)
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}
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}
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