fix(vmm): make MMU bring-up and kernel mappings reliable

Kernel/Include/VM/Heap.h

@@ -0,0 +1,24 @@
+#pragma once
+#include <Types.h>
+
+enum {
+    kHeapSizePages = 1024,
+    kHeapBlockHeaderMagic = 0x43555445, // CUTE
+    kKernelHeapStart = 0xFFFFFFFFC0000000
+};
+
+static inline Address VMPhysToHeap(Address phys) { return phys + kKernelHeapStart; }
+static inline Address VMHeapToPhys(Address heap) { return heap - kKernelHeapStart; }
+
+typedef struct  __attribute__((aligned(16))) VMHeapBlockHeader {
+    UInt64 magic;
+    struct VMHeapBlockHeader* next;
+    struct VMHeapBlockHeader* previous;
+    UInt64 size;
+    bool isFree;
+} VMHeapBlockHeader;
+
+void HeapInitialize();
+Pointer HeapAllocate(Size size);
+void HeapFree(Pointer pointer);
+Pointer HeapResize(Pointer pointer, Size newSize);

Kernel/Include/VM/PMM.h

@@ -21,6 +21,6 @@ typedef struct {
     VMMemoryRegion UART;
 } VMBootMemoryMap;
 
-void PMMInitialize(VMBootMemoryMap* bootMap, Bootinfo* info);
+void PMMInitialize(VMBootMemoryMap* bootMap);
 Pointer PMMAllocatePage();
 void PMMFreePage(Address address);

Kernel/Include/VM/VMM.h

@@ -29,7 +29,7 @@ enum {
 
 
 static inline Address VMKernelVirtToPhys(Address virt) {
-    return virt - kVMKernelVMA;
+    return virt - 0xFFFFFFFF80100000 + 0x40100000; // TODO: hardcode is awful
 }
 
 static inline Address VMPhysToHHDM(Address phys) {