grabbed ppsspp's MemArena

2 files changed, 428 insertions, 221 deletions

diff --git a/src/common/src/mem_arena.cpp b/src/common/src/mem_arena.cpp
index 291103be..1a6fcf44 100644
--- a/src/common/src/mem_arena.cpp
+++ b/src/common/src/mem_arena.cpp
@@ -1,14 +1,27 @@
-// Copyright 2013 Dolphin Emulator Project
-// Licensed under GPLv2
-// Refer to the license.txt file included.
+// 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/
+
+#include <string>
 
-#include "common.h"
 #include "memory_util.h"
 #include "mem_arena.h"
 
 #ifdef _WIN32
-#include <windows.h>
+//#include "CommonWindows.h"
 #else
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -20,55 +33,134 @@
 #include <linux/ashmem.h>
 #endif
 #endif
-#include <set>
 
-#if defined(__APPLE__)
-static const char* ram_temp_file = "/tmp/gc_mem.tmp";
-#elif !defined(_WIN32) // non OSX unixes
-static const char* ram_temp_file = "/dev/shm/gc_mem.tmp";
+#ifdef IOS
+void* globalbase = NULL;
 #endif
+
 #ifdef ANDROID
-#define ASHMEM_DEVICE "/dev/ashmem"
 
-int AshmemCreateFileMapping(const char *name, size_t size)
+// Hopefully this ABI will never change...
+
+
+#define ASHMEM_DEVICE	"/dev/ashmem"
+
+/*
+* ashmem_create_region - creates a new ashmem region and returns the file
+* descriptor, or <0 on error
+*
+* `name' is an optional label to give the region (visible in /proc/pid/maps)
+* `size' is the size of the region, in page-aligned bytes
+*/
+int ashmem_create_region(const char *name, size_t size)
+{
+    int fd, ret;
+
+    fd = open(ASHMEM_DEVICE, O_RDWR);
+    if (fd < 0)
+        return fd;
+
+    if (name) {
+        char buf[ASHMEM_NAME_LEN];
+
+        strncpy(buf, name, sizeof(buf));
+        ret = ioctl(fd, ASHMEM_SET_NAME, buf);
+        if (ret < 0)
+            goto error;
+    }
+
+    ret = ioctl(fd, ASHMEM_SET_SIZE, size);
+    if (ret < 0)
+        goto error;
+
+    return fd;
+
+error:
+    ERROR_LOG(MEMMAP, "NASTY ASHMEM ERROR: ret = %08x", ret);
+    close(fd);
+    return ret;
+}
+
+int ashmem_set_prot_region(int fd, int prot)
 {
-	int fd, ret;
-	fd = open(ASHMEM_DEVICE, O_RDWR);
-	if (fd < 0)
-		return fd;
-
-	// We don't really care if we can't set the name, it is optional	
-	ret = ioctl(fd, ASHMEM_SET_NAME, name);
-
-	ret = ioctl(fd, ASHMEM_SET_SIZE, size);
-	if (ret < 0)
-	{
-		close(fd);
-		NOTICE_LOG(MEMMAP, "Ashmem returned error: 0x%08x", ret);
-		return ret;
-	}
-	return fd;
+    return ioctl(fd, ASHMEM_SET_PROT_MASK, prot);
+}
+
+int ashmem_pin_region(int fd, size_t offset, size_t len)
+{
+    struct ashmem_pin pin = { offset, len };
+    return ioctl(fd, ASHMEM_PIN, &pin);
+}
+
+int ashmem_unpin_region(int fd, size_t offset, size_t len)
+{
+    struct ashmem_pin pin = { offset, len };
+    return ioctl(fd, ASHMEM_UNPIN, &pin);
+}
+#endif  // Android
+
+
+
+#ifndef _WIN32
+// do not make this "static"
+#if defined(MAEMO) || defined(MEEGO_EDITION_HARMATTAN)
+std::string ram_temp_file = "/home/user/gc_mem.tmp";
+#else
+std::string ram_temp_file = "/tmp/gc_mem.tmp";
+#endif
+#elif !defined(_XBOX)
+SYSTEM_INFO sysInfo;
+#endif
+
+
+// Windows mappings need to be on 64K boundaries, due to Alpha legacy.
+#ifdef _WIN32
+size_t roundup(size_t x) {
+#ifndef _XBOX
+    int gran = sysInfo.dwAllocationGranularity ? sysInfo.dwAllocationGranularity : 0x10000;
+#else
+    int gran = 0x10000; // 64k in 360
+#endif
+    return (x + gran - 1) & ~(gran - 1);
+}
+#else
+size_t roundup(size_t x) {
+    return x;
 }
 #endif
 
+
 void MemArena::GrabLowMemSpace(size_t size)
 {
 #ifdef _WIN32
-	hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, (DWORD)(size), NULL);
+#ifndef _XBOX
+    hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, (DWORD)(size), NULL);
+    GetSystemInfo(&sysInfo);
+#endif
 #elif defined(ANDROID)
-	fd = AshmemCreateFileMapping("Dolphin-emu", size);
-	if (fd < 0)
-	{
-		NOTICE_LOG(MEMMAP, "Ashmem allocation failed");
-		return;
-	}
+    // Use ashmem so we don't have to allocate a file on disk!
+    fd = ashmem_create_region("PPSSPP_RAM", size);
+    // Note that it appears that ashmem is pinned by default, so no need to pin.
+    if (fd < 0)
+    {
+        ERROR_LOG(MEMMAP, "Failed to grab ashmem space of size: %08x  errno: %d", (int)size, (int)(errno));
+        return;
+    }
 #else
-	mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
-	fd = open(ram_temp_file, O_RDWR | O_CREAT, mode);
-	unlink(ram_temp_file);
-	if (ftruncate(fd, size) < 0)
-		ERROR_LOG(MEMMAP, "Failed to allocate low memory space");
-	return;
+    mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
+    fd = open(ram_temp_file.c_str(), O_RDWR | O_CREAT, mode);
+    if (fd < 0)
+    {
+        ERROR_LOG(MEMMAP, "Failed to grab memory space as a file: %s of size: %08x  errno: %d", ram_temp_file.c_str(), (int)size, (int)(errno));
+        return;
+    }
+    // delete immediately, we keep the fd so it still lives
+    unlink(ram_temp_file.c_str());
+    if (ftruncate(fd, size) != 0)
+    {
+        ERROR_LOG(MEMMAP, "Failed to ftruncate %d to size %08x", (int)fd, (int)size);
+    }
+    return;
 #endif
 }
 
@@ -76,10 +168,13 @@ void MemArena::GrabLowMemSpace(size_t size)
 void MemArena::ReleaseSpace()
 {
 #ifdef _WIN32
-	CloseHandle(hMemoryMapping);
-	hMemoryMapping = 0;
+    CloseHandle(hMemoryMapping);
+    hMemoryMapping = 0;
+#elif defined(__SYMBIAN32__)
+    memmap->Close();
+    delete memmap;
 #else
-	close(fd);
+    close(fd);
 #endif
 }
 
@@ -87,23 +182,32 @@ void MemArena::ReleaseSpace()
 void *MemArena::CreateView(s64 offset, size_t size, void *base)
 {
 #ifdef _WIN32
-	return MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
+#ifdef _XBOX
+    size = roundup(size);
+    // use 64kb pages
+    void * ptr = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_LARGE_PAGES, PAGE_READWRITE);
+    return ptr;
 #else
-	void *retval = mmap(
-		base, size,
-		PROT_READ | PROT_WRITE,
-		MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED),
-		fd, offset);
-
-	if (retval == MAP_FAILED)
-	{
-		NOTICE_LOG(MEMMAP, "mmap on %s failed", ram_temp_file);
-		return nullptr;
-	}
-	else
-	{
-		return retval;
-	}
+    size = roundup(size);
+    void *ptr = MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
+    return ptr;
+#endif
+#else
+    void *retval = mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED |
+        // Do not sync memory to underlying file. Linux has this by default.
+#ifdef BLACKBERRY
+        MAP_NOSYNCFILE |
+#elif defined(__FreeBSD__)
+        MAP_NOSYNC |
+#endif
+        ((base == 0) ? 0 : MAP_FIXED), fd, offset);
+
+    if (retval == MAP_FAILED)
+    {
+        NOTICE_LOG(MEMMAP, "mmap on %s (fd: %d) failed", ram_temp_file.c_str(), (int)fd);
+        return 0;
+    }
+    return retval;
 #endif
 }
 
@@ -111,184 +215,263 @@ void *MemArena::CreateView(s64 offset, size_t size, void *base)
 void MemArena::ReleaseView(void* view, size_t size)
 {
 #ifdef _WIN32
-	UnmapViewOfFile(view);
+#ifndef _XBOX
+    UnmapViewOfFile(view);
+#endif
+#elif defined(__SYMBIAN32__)
+    memmap->Decommit(((int)view - (int)memmap->Base()) & 0x3FFFFFFF, size);
 #else
-	munmap(view, size);
+    munmap(view, size);
 #endif
 }
 
-
+#ifndef __SYMBIAN32__
 u8* MemArena::Find4GBBase()
 {
 #ifdef _M_X64
 #ifdef _WIN32
-	// 64 bit
-	u8* base = (u8*)VirtualAlloc(0, 0xE1000000, MEM_RESERVE, PAGE_READWRITE);
-	VirtualFree(base, 0, MEM_RELEASE);
-	return base;
+    // 64 bit
+    u8* base = (u8*)VirtualAlloc(0, 0xE1000000, MEM_RESERVE, PAGE_READWRITE);
+    VirtualFree(base, 0, MEM_RELEASE);
+    return base;
 #else
-	// Very precarious - mmap cannot return an error when trying to map already used pages.
-	// This makes the Windows approach above unusable on Linux, so we will simply pray...
-	return reinterpret_cast<u8*>(0x2300000000ULL);
+    // Very precarious - mmap cannot return an error when trying to map already used pages.
+    // This makes the Windows approach above unusable on Linux, so we will simply pray...
+    return reinterpret_cast<u8*>(0x2300000000ULL);
 #endif
 
-#else
-	// 32 bit
+#else // 32 bit
+
 #ifdef _WIN32
-	// The highest thing in any 1GB section of memory space is the locked cache. We only need to fit it.
-	u8* base = (u8*)VirtualAlloc(0, 0x31000000, MEM_RESERVE, PAGE_READWRITE);
-	if (base) {
-		VirtualFree(base, 0, MEM_RELEASE);
-	}
-	return base;
+    u8* base = (u8*)VirtualAlloc(0, 0x10000000, MEM_RESERVE, PAGE_READWRITE);
+    if (base) {
+        VirtualFree(base, 0, MEM_RELEASE);
+    }
+    return base;
 #else
-#ifdef ANDROID
-	// Android 4.3 changed how mmap works.
-	// if we map it private and then munmap it, we can't use the base returned.
-	// This may be due to changes in them support a full SELinux implementation.
-	const int flags = MAP_ANON;
+#ifdef IOS
+    void* base = NULL;
+    if (globalbase == NULL){
+        base = mmap(0, 0x08000000, PROT_READ | PROT_WRITE,
+            MAP_ANON | MAP_SHARED, -1, 0);
+        if (base == MAP_FAILED) {
+            PanicAlert("Failed to map 128 MB of memory space: %s", strerror(errno));
+            return 0;
+        }
+        munmap(base, 0x08000000);
+        globalbase = base;
+    }
+    else{ base = globalbase; }
 #else
-	const int flags = MAP_ANON | MAP_PRIVATE;
+    void* base = mmap(0, 0x10000000, PROT_READ | PROT_WRITE,
+        MAP_ANON | MAP_SHARED, -1, 0);
+    if (base == MAP_FAILED) {
+        PanicAlert("Failed to map 256 MB of memory space: %s", strerror(errno));
+        return 0;
+    }
+    munmap(base, 0x10000000);
 #endif
-	const u32 MemSize = 0x31000000;
-	void* base = mmap(0, MemSize, PROT_NONE, flags, -1, 0);
-	if (base == MAP_FAILED) {
-		PanicAlert("Failed to map 1 GB of memory space: %s", strerror(errno));
-		return 0;
-	}
-	munmap(base, MemSize);
-	return static_cast<u8*>(base);
+    return static_cast<u8*>(base);
 #endif
 #endif
 }
+#endif
 
 
+// yeah, this could also be done in like two bitwise ops...
+#define SKIP(a_flags, b_flags) 
+//	if (!(a_flags & MV_WII_ONLY) && (b_flags & MV_WII_ONLY)) 
+//		continue; 
+//	if (!(a_flags & MV_FAKE_VMEM) && (b_flags & MV_FAKE_VMEM)) 
+//		continue; 
+
 static bool Memory_TryBase(u8 *base, const MemoryView *views, int num_views, u32 flags, MemArena *arena) {
-	// OK, we know where to find free space. Now grab it!
-	// We just mimic the popular BAT setup.
-	u32 position = 0;
-	u32 last_position = 0;
-
-	// Zero all the pointers to be sure.
-	for (int i = 0; i < num_views; i++)
-	{
-		if (views[i].out_ptr_low)
-			*views[i].out_ptr_low = 0;
-		if (views[i].out_ptr)
-			*views[i].out_ptr = 0;
-	}
-
-	int i;
-	for (i = 0; i < num_views; i++)
-	{
-		if (views[i].flags & MV_MIRROR_PREVIOUS) {
-			position = last_position;
-		} else {
-			*(views[i].out_ptr_low) = (u8*)arena->CreateView(position, views[i].size);
-			if (!*views[i].out_ptr_low)
-				goto bail;
-		}
+    // OK, we know where to find free space. Now grab it!
+    // We just mimic the popular BAT setup.
+    size_t position = 0;
+    size_t last_position = 0;
+
+#if defined(_XBOX)
+    void *ptr;
+#endif
+
+    // Zero all the pointers to be sure.
+    for (int i = 0; i < num_views; i++)
+    {
+        if (views[i].out_ptr_low)
+            *views[i].out_ptr_low = 0;
+        if (views[i].out_ptr)
+            *views[i].out_ptr = 0;
+    }
+
+    int i;
+    for (i = 0; i < num_views; i++)
+    {
+        const MemoryView &view = views[i];
+        if (view.size == 0)
+            continue;
+        SKIP(flags, view.flags);
+        if (view.flags & MV_MIRROR_PREVIOUS) {
+            position = last_position;
+        }
+        else {
+#ifdef __SYMBIAN32__
+            *(view.out_ptr_low) = (u8*)((int)arena->memmap->Base() + view.virtual_address);
+            arena->memmap->Commit(view.virtual_address & 0x3FFFFFFF, view.size);
+        }
+        *(view.out_ptr) = (u8*)((int)arena->memmap->Base() + view.virtual_address & 0x3FFFFFFF);
+#elif defined(_XBOX)
+            *(view.out_ptr_low) = (u8*)(base + view.virtual_address);
+            //arena->memmap->Commit(view.virtual_address & 0x3FFFFFFF, view.size);
+            ptr = VirtualAlloc(base + (view.virtual_address & 0x3FFFFFFF), view.size, MEM_COMMIT, PAGE_READWRITE);
+        }
+        *(view.out_ptr) = (u8*)base + (view.virtual_address & 0x3FFFFFFF);
+#else
+            *(view.out_ptr_low) = (u8*)arena->CreateView(position, view.size);
+            if (!*view.out_ptr_low)
+                goto bail;
+        }
 #ifdef _M_X64
-		*views[i].out_ptr = (u8*)arena->CreateView(
-			position, views[i].size, base + views[i].virtual_address);
+        *view.out_ptr = (u8*)arena->CreateView(
+            position, view.size, base + view.virtual_address);
 #else
-		if (views[i].flags & MV_MIRROR_PREVIOUS) {
-			// No need to create multiple identical views.
-			*views[i].out_ptr = *views[i - 1].out_ptr;
-		} else {
-			*views[i].out_ptr = (u8*)arena->CreateView(
-				position, views[i].size, base + (views[i].virtual_address & 0x3FFFFFFF));
-			if (!*views[i].out_ptr)
-				goto bail;
-		}
+        if (view.flags & MV_MIRROR_PREVIOUS) {  // TODO: should check if the two & 0x3FFFFFFF are identical.
+            // No need to create multiple identical views.
+            *view.out_ptr = *views[i - 1].out_ptr;
+        }
+        else {
+            *view.out_ptr = (u8*)arena->CreateView(
+                position, view.size, base + (view.virtual_address & 0x3FFFFFFF));
+            if (!*view.out_ptr)
+                goto bail;
+        }
 #endif
-		last_position = position;
-		position += views[i].size;
-	}
 
-	return true;
+#endif
+        last_position = position;
+        position += roundup(view.size);
+    }
+
+    return true;
 
 bail:
-	// Argh! ERROR! Free what we grabbed so far so we can try again.
-	MemoryMap_Shutdown(views, i+1, flags, arena);
-	return false;
+    // Argh! ERROR! Free what we grabbed so far so we can try again.
+    for (int j = 0; j <= i; j++)
+    {
+        if (views[i].size == 0)
+            continue;
+        SKIP(flags, views[i].flags);
+        if (views[j].out_ptr_low && *views[j].out_ptr_low)
+        {
+            arena->ReleaseView(*views[j].out_ptr_low, views[j].size);
+            *views[j].out_ptr_low = NULL;
+        }
+        if (*views[j].out_ptr)
+        {
+#ifdef _M_X64
+            arena->ReleaseView(*views[j].out_ptr, views[j].size);
+#else
+            if (!(views[j].flags & MV_MIRROR_PREVIOUS))
+            {
+                arena->ReleaseView(*views[j].out_ptr, views[j].size);
+            }
+#endif
+            *views[j].out_ptr = NULL;
+        }
+    }
+    return false;
 }
 
 u8 *MemoryMap_Setup(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
 {
-	u32 total_mem = 0;
-	int base_attempts = 0;
-
-	for (int i = 0; i < num_views; i++)
-	{
-		if ((views[i].flags & MV_MIRROR_PREVIOUS) == 0)
-			total_mem += views[i].size;
-	}
-	// Grab some pagefile backed memory out of the void ...
-	arena->GrabLowMemSpace(total_mem);
-
-	// Now, create views in high memory where there's plenty of space.
-#ifdef _M_X64
-	u8 *base = MemArena::Find4GBBase();
-	// This really shouldn't fail - in 64-bit, there will always be enough
-	// address space.
-	if (!Memory_TryBase(base, views, num_views, flags, arena))
-	{
-		PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
-		exit(0);
-		return 0;
-	}
-#else
-#ifdef _WIN32
-	// Try a whole range of possible bases. Return once we got a valid one.
-	u32 max_base_addr = 0x7FFF0000 - 0x31000000;
-	u8 *base = NULL;
-
-	for (u32 base_addr = 0x40000; base_addr < max_base_addr; base_addr += 0x40000)
-	{
-		base_attempts++;
-		base = (u8 *)base_addr;
-		if (Memory_TryBase(base, views, num_views, flags, arena)) 
-		{
-			INFO_LOG(MEMMAP, "Found valid memory base at %p after %i tries.", base, base_attempts);
-			base_attempts = 0;
-			break;
-		}
-		
-	}
-#else
-	// Linux32 is fine with the x64 method, although limited to 32-bit with no automirrors.
-	u8 *base = MemArena::Find4GBBase();
-	if (!Memory_TryBase(base, views, num_views, flags, arena))
-	{
-		PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
-		exit(0);
-		return 0;
-	}
+    size_t total_mem = 0;
+    int base_attempts = 0;
+
+    for (int i = 0; i < num_views; i++)
+    {
+        if (views[i].size == 0)
+            continue;
+        SKIP(flags, views[i].flags);
+        if ((views[i].flags & MV_MIRROR_PREVIOUS) == 0)
+            total_mem += roundup(views[i].size);
+    }
+    // Grab some pagefile backed memory out of the void ...
+#ifndef __SYMBIAN32__
+    arena->GrabLowMemSpace(total_mem);
 #endif
 
+    // Now, create views in high memory where there's plenty of space.
+#ifdef _M_X64
+    u8 *base = MemArena::Find4GBBase();
+    // This really shouldn't fail - in 64-bit, there will always be enough
+    // address space.
+    if (!Memory_TryBase(base, views, num_views, flags, arena))
+    {
+        PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
+        return 0;
+    }
+#elif defined(_XBOX)
+    // Reserve 256MB
+    u8 *base = (u8*)VirtualAlloc(0, 0x10000000, MEM_RESERVE | MEM_LARGE_PAGES, PAGE_READWRITE);
+    if (!Memory_TryBase(base, views, num_views, flags, arena))
+    {
+        PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
+        exit(0);
+        return 0;
+    }
+#elif defined(_WIN32)
+    // Try a whole range of possible bases. Return once we got a valid one.
+    u32 max_base_addr = 0x7FFF0000 - 0x10000000;
+    u8 *base = NULL;
+
+    for (u32 base_addr = 0x01000000; base_addr < max_base_addr; base_addr += 0x400000)
+    {
+        base_attempts++;
+        base = (u8 *)base_addr;
+        if (Memory_TryBase(base, views, num_views, flags, arena))
+        {
+            INFO_LOG(MEMMAP, "Found valid memory base at %p after %i tries.", base, base_attempts);
+            base_attempts = 0;
+            break;
+        }
+    }
+#elif defined(__SYMBIAN32__)
+    arena->memmap = new RChunk();
+    arena->memmap->CreateDisconnectedLocal(0, 0, 0x10000000);
+    if (!Memory_TryBase(arena->memmap->Base(), views, num_views, flags, arena))
+    {
+        PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
+        return 0;
+    }
+    u8* base = arena->memmap->Base();
+#else
+    // Linux32 is fine with the x64 method, although limited to 32-bit with no automirrors.
+    u8 *base = MemArena::Find4GBBase();
+    if (!Memory_TryBase(base, views, num_views, flags, arena))
+    {
+        ERROR_LOG(MEMMAP, "MemoryMap_Setup: Failed finding a memory base.");
+        PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
+        return 0;
+    }
 #endif
-	if (base_attempts)
-		PanicAlert("No possible memory base pointer found!");
-	return base;
+    if (base_attempts)
+        PanicAlert("No possible memory base pointer found!");
+    return base;
 }
 
 void MemoryMap_Shutdown(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
 {
-	std::set<void*> freeset;
-	for (int i = 0; i < num_views; i++)
-	{
-		const MemoryView* view = &views[i];
-		u8** outptrs[2] = {view->out_ptr_low, view->out_ptr};
-		for (int j = 0; j < 2; j++)
-		{
-			u8** outptr = outptrs[j];
-			if (outptr && *outptr && !freeset.count(*outptr))
-			{
-				arena->ReleaseView(*outptr, view->size);
-				freeset.insert(*outptr);
-				*outptr = NULL;
-			}
-		}
-	}
+    for (int i = 0; i < num_views; i++)
+    {
+        if (views[i].size == 0)
+            continue;
+        SKIP(flags, views[i].flags);
+        if (views[i].out_ptr_low && *views[i].out_ptr_low)
+            arena->ReleaseView(*views[i].out_ptr_low, views[i].size);
+        if (*views[i].out_ptr && (views[i].out_ptr_low && *views[i].out_ptr != *views[i].out_ptr_low))
+            arena->ReleaseView(*views[i].out_ptr, views[i].size);
+        *views[i].out_ptr = NULL;
+        if (views[i].out_ptr_low)
+            *views[i].out_ptr_low = NULL;
+    }
 }
diff --git a/src/common/src/mem_arena.h b/src/common/src/mem_arena.h
index 3c14756d..8bdf9f18 100644
--- a/src/common/src/mem_arena.h
+++ b/src/common/src/mem_arena.h
@@ -1,7 +1,19 @@
-// Copyright 2013 Dolphin Emulator Project
-// Licensed under GPLv2
-// Refer to the license.txt file included.
+// 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_
@@ -10,43 +22,55 @@
 #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 convenient for emulating
+// 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 = nullptr);
-	void ReleaseView(void *view, size_t size);
+    void GrabLowMemSpace(size_t size);
+    void ReleaseSpace();
+    void *CreateView(s64 offset, size_t size, void *base = 0);
+    void ReleaseView(void *view, size_t size);
 
-	// This only finds 1 GB in 32-bit
-	static u8 *Find4GBBase();
+#ifdef __SYMBIAN32__
+    RChunk* memmap;
+#else
+    // This only finds 1 GB in 32-bit
+    static u8 *Find4GBBase();
+#endif
 private:
 
 #ifdef _WIN32
-	HANDLE hMemoryMapping;
+    HANDLE hMemoryMapping;
 #else
-	int fd;
+    int fd;
 #endif
 };
 
 enum {
-	MV_MIRROR_PREVIOUS = 1,
-	MV_IS_PRIMARY_RAM = 0x100,
+    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;
+    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