1 files changed, 81 insertions, 0 deletions

diff --git a/src/common/mem_arena.h b/src/common/mem_arena.h
new file mode 100644
index 000000000..8bdf9f189
--- /dev/null
+++ b/src/common/mem_arena.h
@@ -0,0 +1,81 @@
+// Copyright (C) 2003 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0 or later versions.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+#ifndef _MEMARENA_H_
+#define _MEMARENA_H_
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#ifdef __SYMBIAN32__
+#include <e32std.h>
+#endif
+
+#include "common.h"
+
+// This class lets you create a block of anonymous RAM, and then arbitrarily map views into it.
+// Multiple views can mirror the same section of the block, which makes it very convient for emulating
+// memory mirrors.
+
+class MemArena
+{
+public:
+    void GrabLowMemSpace(size_t size);
+    void ReleaseSpace();
+    void *CreateView(s64 offset, size_t size, void *base = 0);
+    void ReleaseView(void *view, size_t size);
+
+#ifdef __SYMBIAN32__
+    RChunk* memmap;
+#else
+    // This only finds 1 GB in 32-bit
+    static u8 *Find4GBBase();
+#endif
+private:
+
+#ifdef _WIN32
+    HANDLE hMemoryMapping;
+#else
+    int fd;
+#endif
+};
+
+enum {
+    MV_MIRROR_PREVIOUS = 1,
+    // MV_FAKE_VMEM = 2,
+    // MV_WII_ONLY = 4,
+    MV_IS_PRIMARY_RAM = 0x100,
+    MV_IS_EXTRA1_RAM = 0x200,
+    MV_IS_EXTRA2_RAM = 0x400,
+};
+
+struct MemoryView
+{
+    u8 **out_ptr_low;
+    u8 **out_ptr;
+    u32 virtual_address;
+    u32 size;
+    u32 flags;
+};
+
+// Uses a memory arena to set up an emulator-friendly memory map according to
+// a passed-in list of MemoryView structures.
+u8 *MemoryMap_Setup(const MemoryView *views, int num_views, u32 flags, MemArena *arena);
+void MemoryMap_Shutdown(const MemoryView *views, int num_views, u32 flags, MemArena *arena);
+
+#endif // _MEMARENA_H_