Function allocate_active_pages

kernel/src/memory.rs:300–310

Allocate pages in the active page table Inputs ------ start_addr Virtual address in the first page size Size of the region in bytes. flags Set permissions / properties

(
    start_addr: VirtAddr,
    size: u64,
    flags: PageTableFlags)

/// flags       Set permissions / properties
///
pub fn allocate_active_pages(
    start_addr: VirtAddr,
    size: u64,
    flags: PageTableFlags)
    -> Result<(), MapToError<Size4KiB>> {

    let memory_info = unsafe {MEMORY_INFO.as_mut().unwrap()};
    let level_4_table = unsafe {active_level_4_table(memory_info.physical_memory_offset)};

    allocate_pages(&mut *level_4_table, start_addr, size, flags)
}

/// Create user-accessible pages, which are allocated on demand
/// ie when written to.