Function create_consecutive_pages

kernel/src/memory.rs:434–457

Allocates a consecutive set of frames start_addr Starting virtual address in page table num_frames Number of consecutive frames max_physaddr Maximum physical address e.g 32-bit addressable 0xFFFF_FFFF

(
    level_4_physaddr: u64,
    start_addr: VirtAddr,
    num_frames: u64,
    max_physaddr: u64)

/// max_physaddr    Maximum physical address
///                 e.g 32-bit addressable 0xFFFF_FFFF
pub fn create_consecutive_pages(
    level_4_physaddr: u64,
    start_addr: VirtAddr,
    num_frames: u64,
    max_physaddr: u64)
    -> Result<PhysAddr, MapToError<Size4KiB>> {

    // Try to allocate a consecutive set of frames
    let start_frame = {
        let memory_info = unsafe {MEMORY_INFO.as_mut().unwrap()};
        let frame_allocator = &mut memory_info.frame_allocator;

        frame_allocator
            .allocate_consecutive_frames(num_frames, max_physaddr)
            .ok_or(MapToError::FrameAllocationFailed)?
    };

    let start_page = Page::containing_address(start_addr);

    map_consecutive_pages(level_4_physaddr,
                          start_page,
                          start_frame,
                          num_frames)
}

/// Create a mapping to a specific range of physical memory
///