//! `src/mem/mod.rs` — memory subsystem root

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); }
}

/// 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()
}