Function allocate_pages_mapper

kernel/src/memory.rs:243–271

Allocate pages in the specified page table starting at the page containing virtual address \p start_addr and large enough to contain \p size bytes. \p flags PageTableFlags::PRESENT | PageTableFlags::WRITABLE;

(
    frame_allocator: &mut impl FrameAllocator<Size4KiB>,
    mapper: &mut impl Mapper<Size4KiB>,
    start_addr: VirtAddr,
    size: u64,
    flags: PageTableFlags)

///
/// \p flags  PageTableFlags::PRESENT | PageTableFlags::WRITABLE;
pub fn allocate_pages_mapper(
    frame_allocator: &mut impl FrameAllocator<Size4KiB>,
    mapper: &mut impl Mapper<Size4KiB>,
    start_addr: VirtAddr,
    size: u64,
    flags: PageTableFlags)
    -> Result<(), MapToError<Size4KiB>> {

    let page_range = {
        let end_addr = start_addr + size - 1u64;
        let start_page = Page::containing_address(start_addr);
        let end_page = Page::containing_address(end_addr);
        Page::range_inclusive(start_page, end_page)
    };

    for page in page_range {
        let frame = frame_allocator
            .allocate_frame()
            .ok_or(MapToError::FrameAllocationFailed)?;
        unsafe {
            mapper.map_to(page,
                          frame,
                          flags,
                          frame_allocator)?.flush()
        };
    }

    Ok(())
}

pub fn allocate_pages(level_4_table: *mut PageTable,
                      start_addr: VirtAddr,