Function free_page_chunk

kernel/src/memory.rs:530–545

Free a memory chunk, releasing the pages back to the frame allocator

(
    level_4_physaddr: u64,
    address: VirtAddr
)

/// Free a memory chunk, releasing the pages back to the frame allocator
pub fn free_page_chunk(
    level_4_physaddr: u64,
    address: VirtAddr
) -> Result<(), usize> {
    let memory_info = unsafe {MEMORY_INFO.as_mut().unwrap()};

    // Remove from page table, get address of l3 entry
    let (physaddr, level) = get_page_chunk(level_4_physaddr, address, true)?;

    // Free page tables and pages recursively
    free_pages_rec(memory_info.physical_memory_offset,
                   &mut memory_info.frame_allocator,
                   physaddr,
                   level); // Page table level
    Ok(())
}

/// Remove a page chunk from a page table
/// Doesn't free any of the pages