Struct Pmm 

pub struct Pmm {
    bitmap_ptr: *mut u8,
    total_frames: u64,
    bitmap_start_frame: u64,
    bitmap_end_frame: u64,
}

Bitmap-based tracker of free and used physical frames.

Fields

bitmap_ptr: *mut u8

total_frames: u64

bitmap_start_frame: u64

bitmap_end_frame: u64

Implementations

impl Pmm

pub fn init(entries: &[&Entry], hhdm_offset: u64) -> Self

Initialize the PMM from the Limine memory map.

Panics

Panics if no single usable memory region is large enough to hold the bitmap.

pub fn alloc(&self) -> Option<PhysAddr>

Allocate one free physical frame and return its address, or None if out of memory.

pub fn free(&self, addr: PhysAddr)

Free a previously allocated physical frame.

Panics

Panics if addr is frame 0, lies within the bitmap’s own frames, is beyond tracked memory, or is already free (double-free).

Trait Implementations

impl Send for Pmm

impl Sync for Pmm