Struct PageFrameManager 

pub struct PageFrameManager<T: AbsAddressTranslator> { /* private fields */ }

The page frame manager singleton.

self type implements AbsPageFrameManager and is the central point for manipulating page frame flags and accessing per‑frame metadata.

Implementations

impl<T: AbsAddressTranslator> PageFrameManager<T>

pub const fn new() -> Self

Creates a new uninitialised page frame manager.

The manager is not usable until init() is called.

pub fn init(&self)

Initialises the global page frame manager.

self function:

1. Detects total physical memory and computes the number of frames.
2. Finds a physical memory region large enough to hold the PageFrame array.
3. Maps that region into the kernel’s virtual address space.
4. Initialises each PageFrame with default values.
5. Sets the RESERVED flag for all frames, then clears it for usable RAM entries.
6. Finally reserves the frames that contain the metadata array itself.

Panics

Panics if the memory map is unavailable or if no suitable region is found.

Trait Implementations

impl<T: AbsAddressTranslator> AbsPageFrameManager for PageFrameManager<T>

fn check_flags(&self, pfn: PageFrameNumber, flag: PageFlags) -> bool

Checks whether a given flag is set on the specified page frame.

fn clear_flags(&self, pfn: PageFrameNumber, flag: PageFlags)

Clears the specified flags on the given page frame.

fn max(&self) -> PageFrameNumber

Returns the maximum possible page frame number.

TODO

self currently returns PFN::MAX, which may be larger than the actual number of frames. A proper implementation should return the highest valid PFN based on the detected memory size.

fn min(&self) -> PageFrameNumber

Returns the minimum possible page frame number (always 0).

fn present(&self, _pfn: PageFrameNumber) -> bool

Returns whether a page frame is physically present.

TODO

self always returns true. A real implementation should validate the PFN against the number of available frames.

fn set_flags(&self, pfn: PageFrameNumber, flag: PageFlags)

Sets the specified flags on the given page frame.

fn get(&self, pfn: PageFrameNumber) -> Self::Access

Returns a locked guard that provides mutable access to the page frame metadata.

type Flags = PageFlags

Type representing flags that can be set on a page frame. Must implement AbsFlags.

type Access = MutexGuard<'static, PageFrame, Spin>

Type used to access a page frame (e.g., a reference or a descriptor).

impl<T: Clone + AbsAddressTranslator> Clone for PageFrameManager<T>

fn clone(&self) -> PageFrameManager<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Copy + AbsAddressTranslator> Copy for PageFrameManager<T>

impl<T: Debug + AbsAddressTranslator> Debug for PageFrameManager<T>

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

Formats the value using the given formatter.

impl<T: Default + AbsAddressTranslator> Default for PageFrameManager<T>

fn default() -> PageFrameManager<T>

Returns the “default value” for a type.