feat: major memory managment & PMactor

kernel/src/mem/mod.rs

@@ -1,16 +1,34 @@
-pub mod pmm;
-pub mod address;
-pub mod paging;
-pub mod allocator;
+//! `src/mem/mod.rs` — memory subsystem root
 
-#[allow(dead_code)]
-pub fn init(memmap: &limine::response::MemoryMapResponse, hhdm_offset: u64) {
-    unsafe {
-        pmm::BitmapPMM::init(memmap, hhdm_offset);
-    }
+pub mod address;
+pub mod allocator;
+pub mod buddy;       // ← new: per-actor buddy allocator
+pub mod paging;
+pub mod pm_manages;
+pub mod pmm;
+pub mod vmm;
+
+/// Initialise the physical memory manager.
+///
+/// Must be called before any heap allocation or VMM operation.
+pub fn init_pmm(memmap: &limine::response::MemoryMapResponse, hhdm_offset: u64) {
+    unsafe { pmm::BitmapPMM::init(memmap, hhdm_offset); }
 }
 
-#[allow(dead_code)]
+/// Initialise CPU features required by the VMM (INVPCID detection).
+///
+/// Must be called before `init_vmm` and any `AddressSpace::activate()`.
+pub fn init_cpu_features() {
+    vmm::init_cpu_features();
+}
+
+/// Initialise the kernel address space record (after PMM, heap, and the
+/// initial P4 page table have been set up in `kmain`).
+pub fn init_vmm(pml4_phys: address::PhysAddr, hhdm_offset: u64) {
+    vmm::init_kernel_space(pml4_phys, hhdm_offset);
+}
+
+/// Physical memory statistics: `(used_pages, total_pages)`.
 pub fn get_stats() -> (usize, usize) {
     pmm::get_stats()
 }