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Set the NXE and the WP bit

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Philipp Oppermann
2015-12-31 16:39:07 +01:00
parent 76d1c41e96
commit e2b99ac8c1
1 changed files with 21 additions and 0 deletions
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21
src/lib.rs
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@@ -68,12 +68,33 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) {
memory_map_tag.memory_areas()); memory_map_tag.memory_areas());
memory::test_paging(&mut frame_allocator); memory::test_paging(&mut frame_allocator);
enable_nxe_bit();
enable_write_protect_bit();
memory::remap_the_kernel(&mut frame_allocator, boot_info); memory::remap_the_kernel(&mut frame_allocator, boot_info);
println!("It did not crash!"); println!("It did not crash!");
loop {} loop {}
} }
fn enable_nxe_bit() {
use x86::msr::{IA32_EFER, rdmsr, wrmsr};
let nxe_bit = 1 << 11;
unsafe {
let efer = rdmsr(IA32_EFER);
wrmsr(IA32_EFER, efer | nxe_bit);
}
}
fn enable_write_protect_bit() {
use x86::controlregs::{cr0, cr0_write};
let wp_bit = 1 << 16;
unsafe { cr0_write(cr0() | wp_bit) };
}
#[cfg(not(test))] #[cfg(not(test))]
#[lang = "eh_personality"] #[lang = "eh_personality"]
extern "C" fn eh_personality() {} extern "C" fn eh_personality() {}