Module mm 

memory management unit

Modules

pma 🔒

(deprecated) a simple stack based 4K physical frame allocator.

vmm

a very simple virtual memory manager

Structs

KSTACK_ALLOCATOR

KStackAllocator

wrapper around the global allocator with caching

Constants

LAYOUT_4K_ALIGNED 🔒

Statics

ALLOCATOR 🔒

Functions

allocate_4k

allocate 4k aligned memory. TODO create a buffer (like in KStackAllocator) for performance.

allocate_4k_zeroed

drop_init_mapping^⚠

drop the low memory mapping from the current pagetable by removing the first entry from pml4 table (which mapps to 0~512G). The PDP table is unchanged, wasting 4K of memory but there is nothing we can do now since the heap allocator doesn’t manage this address.

flush_tlb

flush the whole tlb

init

half measure: simply initialize the linkedlist allocator

invlpg

invalidate a single page mapping in tlb