Enum FramePurpose 

pub enum FramePurpose {
    PageTable,
    KernelData,
    UserData,
    Custom(u32),
}

Describes the intended purpose of an allocated frame.

Purpose is written into FrameMeta::flags with Ordering::Release so that any concurrent reader of the metadata (e.g. a TLB-shootdown handler deciding whether a frame holds a page-table node) sees a consistent view.

Variants

PageTable

Frame will hold a kernel page-table node (PML4/PDPT/PD/PT).

These frames MUST be zeroed : unzeroed page-table nodes are the primary source of non-deterministic RIP at Ring 3 transition.

KernelData

Frame belongs to kernel address-space (e.g. heap, stack, metadata).

UserData

Frame belongs to a user-space address-space (anonymous or file-backed).

Custom(u32)

Caller-managed; raw flags are passed through unchanged.

Implementations

impl FramePurpose

fn to_flags(self) -> u32

pub fn requires_zero(self) -> bool

Returns true if this purpose requires zeroing regardless of the zeroed option. Page-table nodes must always be zeroed.

Trait Implementations

impl Clone for FramePurpose

fn clone(&self) -> FramePurpose

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for FramePurpose

impl Debug for FramePurpose

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

Formats the value using the given formatter.

impl Eq for FramePurpose

impl PartialEq for FramePurpose

fn eq(&self, other: &FramePurpose) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for FramePurpose