Struct PageFrame 

#[repr(C, align(32))]
pub struct PageFrame {
    pub flags: PageFlags,
    pub order: u8,
    pub next: u32,
    pub prev: u32,
    pub size_class: u8,
    pub rc: u16,
    pub freelist_va: usize,
    pub _pad: u8,
}

Metadata associated with a single physical page frame.

This structure stores per‑frame information required by the page frame manager, such as flags, allocation order, linked list pointers for free lists, reference count, and a pointer to the kernel virtual address of the freelist header (if any). It is guaranteed to be 32‑byte aligned.

Fields

flags: PageFlags

Page state flags (locked, dirty, reserved, etc.).

order: u8

Allocation order (2^order pages). 0 means a single 4 KiB page.

next: u32

Index of the next page frame in a linked list (e.g., free list).

prev: u32

Index of the previous page frame in a linked list.

size_class: u8

Size class index for slab allocators (if used).

rc: u16

Reference count: number of users of this page frame.

freelist_va: usize

Kernel virtual address of the freelist header (or 0 if none).

_pad: u8

Padding to maintain alignment and reserved for future use.

Implementations

impl PageFrame

pub const fn new() -> Self

Creates a new, zeroed (default) page frame metadata structure.

All fields are initialised with their default values. The flags field is cloned from a zeroed instance of F.

Panics

This function is const and will not panic.

pub fn reset(&mut self)

Resets the page frame metadata to its default state.

This is equivalent to *self = PageFrame::new(). After calling this, all flags are cleared, and counters are set to zero.

Trait Implementations

impl Debug for PageFrame

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PageFrame

fn default() -> PageFrame

Returns the “default value” for a type.