Memory: Use a table based lookup scheme to read from memory regions

src/core/memory_setup.h

@@ -0,0 +1,29 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace Memory {
+
+void InitMemoryMap();
+
+/**
+ * Maps an allocated buffer onto a region of the emulated process address space.
+ *
+ * @param base The address to start mapping at. Must be page-aligned.
+ * @param size The amount of bytes to map. Must be page-aligned.
+ * @param target Buffer with the memory backing the mapping. Must be of length at least `size`.
+ */
+void MapMemoryRegion(VAddr base, u32 size, u8* target);
+
+/**
+ * Maps a region of the emulated process address space as a IO region.
+ * @note Currently this can only be used to mark a region as being IO, since actual memory-mapped
+ *       IO isn't yet supported.
+ */
+void MapIoRegion(VAddr base, u32 size);
+
+}