Module paging 

Virtual Memory Management (Paging) for Strat9-OS

Uses the x86_64 crate’s OffsetPageTable which is designed for the HHDM (Higher Half Direct Map) pattern : exactly what Limine provides.

Provides map/unmap/translate operations on the active page table.

Structs

BuddyFrameAllocator

Wrapper around the buddy allocator implementing the x86_64 crate’s FrameAllocator trait.

Functions

active_page_table

Read the current CR3 value (physical address of the active level-4 page table).

ensure_identity_map

Ensure a physical address is identity-mapped in the HHDM region.

ensure_identity_map_range

Ensure a physical range is mapped in the HHDM region.

init

Initialize the paging subsystem.

is_hhdm_range_mapped_now

Returns whether the current page tables map the HHDM view of the whole range.

is_initialized

Returns whether initialized.

kernel_l4_phys

Return the physical address of the kernel’s level-4 page table.

map_all_ram

Map all RAM regions from the memory map into the HHDM.

map_page

Map a virtual page to a physical frame with the given flags.

map_page_kernel

Map a page into the kernel’s canonical page tables (not the active CR3).

translate

Translate a virtual address to its mapped physical address.

unmap_page

Unmap a page from the active CR3, returning the physical frame.

unmap_page_kernel

Unmap a page from the kernel’s canonical page tables.