Struct allocator::BitmapPageAllocator

pub struct BitmapPageAllocator<const PAGE_SIZE: usize> { /* private fields */ }

A page-granularity memory allocator based on the bitmap_allocator.

It internally uses a bitmap, each bit indicates whether a page has been allocated.

The PAGE_SIZE must be a power of two.

Implementations

impl<const PAGE_SIZE: usize> BitmapPageAllocator<PAGE_SIZE>

pub const fn new() -> Self

Creates a new empty BitmapPageAllocator.

Trait Implementations

impl<const PAGE_SIZE: usize> BaseAllocator for BitmapPageAllocator<PAGE_SIZE>

fn init(&mut self, start: usize, size: usize)

Initialize the allocator with a free memory region.

fn add_memory(&mut self, _start: usize, _size: usize) -> AllocResult

Add a free memory region to the allocator.

impl<const PAGE_SIZE: usize> PageAllocator for BitmapPageAllocator<PAGE_SIZE>

const PAGE_SIZE: usize = PAGE_SIZE

The size of a memory page.

fn alloc_pages( &mut self, num_pages: usize, align_pow2: usize ) -> AllocResult<usize>

Allocate contiguous memory pages with given count and alignment.

fn dealloc_pages(&mut self, pos: usize, num_pages: usize)

Deallocate contiguous memory pages with given position and count.

fn total_pages(&self) -> usize

Returns the total number of memory pages.

fn used_pages(&self) -> usize

Returns the number of allocated memory pages.

fn available_pages(&self) -> usize

Returns the number of available memory pages.