Function active_level_4_table

kernel/src/memory.rs:90–101

This should only be called from the init function because each call will result in a mutable reference

(physical_memory_offset: VirtAddr)

/// This should only be called from the init function
/// because each call will result in a mutable reference
unsafe fn active_level_4_table(physical_memory_offset: VirtAddr)
                               -> &'static mut PageTable {
    use x86_64::registers::control::Cr3;

    let (level_4_table_frame, _) = Cr3::read();

    let phys = level_4_table_frame.start_address();
    let virt = physical_memory_offset + phys.as_u64();
    let page_table_ptr: *mut PageTable = virt.as_mut_ptr();

    &mut *page_table_ptr // unsafe
}

/// Create a new page table
///