Module meta

Metadata management of frames.

You can picture a globally shared, static, gigantic array of metadata initialized for each frame. Each entry in this array holds the metadata for a single frame. There would be a dedicated small “heap” space in each slot for dynamic metadata. You can store anything as the metadata of a frame as long as it’s [Sync].

Implementation

The slots are placed in the metadata pages mapped to a certain virtual address in the kernel space. So finding the metadata of a frame often comes with no costs since the translation is a simple arithmetic operation.

Macros

impl_frame_meta_for

Makes a structure usable as a frame metadata.

Structs

KernelMeta

The metadata of physical pages that contains the kernel itself.

MetaPageMeta

The metadata of frames that holds metadata of frames.

ReservedMemoryMeta

Reserved memory metadata. Maybe later used as I/O memory.

UnusableMemoryMeta

Unusable memory metadata. Cannot be used for any purposes.

Enums

GetFrameError

The error type for getting the frame from a physical address.

Constants

FRAME_METADATA_MAX_ALIGN

The maximum alignment in bytes of the metadata of a frame.

FRAME_METADATA_MAX_SIZE

The maximum number of bytes of the metadata of a frame.

Traits

AnyFrameMeta

All frame metadata types must implement this trait.