Struct Pmm 

pub struct Pmm {
    head: [Option<PhysAddr>; 11],
    total_mem: u64,
}

Buddy-Allocator based tracker of free and head physical frames.

Fields

head: [Option<PhysAddr>; 11]

total_mem: u64

Implementations

impl Pmm

pub fn init(entries: &[&Entry]) -> Self

Initialize the PMM from the Limine memory map, coalescing usable frames into the buddy free lists.

pub fn get_total_mem(&self) -> u64

Getter for the length of total memory, returns the highest physical address given by the memmap

pub fn alloc(&mut self, order: usize) -> Option<PhysAddr>

Allocate a block of FRAME_SIZE << order bytes

pub fn alloc_frame(&mut self) -> Option<PhysAddr>

Wrapper for alloc(0), allocates exactly one frame (order 0)

pub fn alloc_frame_zeroed(&mut self) -> Option<PhysAddr>

Wrapper for [alloc_frame] which zeroes the frame before returning it

pub fn free(&mut self, addr: PhysAddr, order: usize)

Return a block of FRAME_SIZE << order bytes to the free lists, merging with available buddies

pub fn free_frame(&mut self, addr: PhysAddr)

Wrapper for free(addr, 0), frees exactly one frame (order 0)

fn pop(&mut self, order: usize) -> Option<PhysAddr>

Remove and return the head block from the order-order free list, or None if empty.

fn push(&mut self, order: usize, addr: PhysAddr)

Prepend addr onto the order-order free list.