Function create_physical_range_pages

kernel/src/memory.rs:464–480

Create a mapping to a specific range of physical memory Doesn't do any frame allocation, so assumes that it's ok to use the memory. Used for mapping a memory chunk to VGA memory.

(
    level_4_physaddr: u64,
    start_virtaddr: VirtAddr,
    num_frames: u64,
    start_physaddr: PhysAddr)

/// to use the memory. Used for mapping a memory chunk to
/// VGA memory.
pub fn create_physical_range_pages(
    level_4_physaddr: u64,
    start_virtaddr: VirtAddr,
    num_frames: u64,
    start_physaddr: PhysAddr)
    -> Result<PhysAddr, MapToError<Size4KiB>> {

    let start_page = Page::from_start_address(start_virtaddr)
        .map_err(|_| MapToError::FrameAllocationFailed)?;
    let start_frame = PhysFrame::from_start_address(start_physaddr)
        .map_err(|_| MapToError::FrameAllocationFailed)?;

    map_consecutive_pages(level_4_physaddr,
                          start_page,
                          start_frame,
                          num_frames)
}

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