Constant sunrise_kernel::frame_allocator::i386::FRAME_OFFSET_MASK

const FRAME_OFFSET_MASK: usize = 0xFFF;

The offset part in a PhysicalAddress.

let phys_address = PhysicalAddress(0xccccc567);

let offset_in_frame = phys_address & FRAME_OFFSET_MASK;
assert_eq!(offset_in_frame, 0x567);