Method allocate_frame

kernel/src/memory/frame_allocator.rs:386–393

(&mut self)

unsafe impl FrameAllocator<Size4KiB> for MultilevelBitmapFrameAllocator {
    fn allocate_frame(&mut self) -> Option<PhysFrame> {
        if let Some(frame_number) = self.fetch_frame() {
            // Convert from frame number to physical address
            return PhysFrame::from_start_address(
                self.frame_phys_addr + frame_number * 4096).ok();
        }
        None
    }
}

#[test_case]