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

2026-04-26 23:41:57 +04:00
parent b56b55e4b3
commit 5d010f7fb2
8 changed files with 167 additions and 13 deletions
@@ -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);