Function init

kernel/src/memory/kernel_info.rs:30–45

Initialise a frame to hold the KernelInfo struct

(
    frame_allocator: &mut impl FrameAllocator<Size4KiB>,
    physical_memory_offset: VirtAddr
)

/// Initialise a frame to hold the KernelInfo struct
pub fn init(
    frame_allocator: &mut impl FrameAllocator<Size4KiB>,
    physical_memory_offset: VirtAddr
) -> Result<(), MapToError<Size4KiB>> {

    // Get one frame
    let frame = frame_allocator
        .allocate_frame()
        .ok_or(MapToError::FrameAllocationFailed)?;

    // This frame is already mapped. Save its physical and virtual addresses
    FRAME_PHYSADDR.store(frame.start_address().as_u64(), Ordering::Relaxed);
    FRAME_VIRTADDR.store(physical_memory_offset.as_u64() + frame.start_address().as_u64(),
                         Ordering::Relaxed);
    Ok(())
}

pub fn get_ref() -> &'static KernelInfo {
    let ptr = FRAME_VIRTADDR.load(Ordering::Relaxed) as *const KernelInfo;