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Add user attribute to pages

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This commit is contained in:
Mark 2020-09-28 14:21:55 +03:00
parent 39cb3e7414
commit f362616fdc
1 changed files with 5 additions and 4 deletions
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9
src/mem.rs
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@ -3,6 +3,7 @@ unsafe fn load_cr3(value: usize) {
}
const PAGE_HUGE: u64 = 1 << 7;
const PAGE_USER: u64 = 1 << 2;
const PAGE_WRITE: u64 = 1 << 1;
const PAGE_PRESENT: u64 = 1 << 0;
@ -13,18 +14,18 @@ static mut TABLES: [u64; 512 * 6] = [0; 512 * 6];
unsafe fn setup_tables() {
for i in 0 .. 512 * 4 {
// pd[i] = 2MiB block
TABLES[i + 512 * 2] = (i << 21) as u64 | PAGE_HUGE | PAGE_WRITE | PAGE_PRESENT;
TABLES[i + 512 * 2] = (i << 21) as u64 | PAGE_HUGE | PAGE_WRITE | PAGE_PRESENT | PAGE_USER;
}
for i in 0 .. 4 {
// pdpt[i] = pd_i
TABLES[512 + i] = (&TABLES[i * 512 + 512 * 2]) as *const _ as u64 | PAGE_WRITE | PAGE_PRESENT;
TABLES[512 + i] = (&TABLES[i * 512 + 512 * 2]) as *const _ as u64 | PAGE_WRITE | PAGE_PRESENT | PAGE_USER;
}
// pml4[0] = PRESENT | pdpt
TABLES[0] = (&TABLES[512]) as *const _ as u64 | PAGE_WRITE | PAGE_PRESENT;
TABLES[0] = (&TABLES[512]) as *const _ as u64 | PAGE_WRITE | PAGE_PRESENT | PAGE_USER;
// pml4[510] = PRESENT | pdpt
TABLES[510] = (&TABLES[512]) as *const _ as u64 | PAGE_WRITE | PAGE_PRESENT;
TABLES[510] = (&TABLES[512]) as *const _ as u64 | PAGE_WRITE | PAGE_PRESENT | PAGE_USER;
}
pub fn setup_upper() {