Create a MemoryObject class and use it to load programs.

zion/object/memory_object.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "lib/linked_list.h"
+#include "object/kernel_object.h"
+
+/*
+ * MemoryObject is a page-aligned set of memory that corresponds
+ * to physical pages.
+ *
+ * It can be mapped in to one or more address spaces.
+ * */
+class MemoryObject : public KernelObject {
+ public:
+  MemoryObject(uint64_t size);
+
+  uint64_t size() { return size_; }
+  uint64_t num_pages() { return size_ / 0x1000; }
+
+  uint64_t PhysicalPageAtOffset(uint64_t offset);
+
+  void CopyBytesToObject(uint64_t source, uint64_t length);
+
+ private:
+  // Always stores the full page-aligned size.
+  uint64_t size_;
+
+  uint64_t PageNumberToPhysAddr(uint64_t page_num);
+
+  LinkedList<uint64_t> phys_page_list_;
+};