/*---------------------------------------------------------------------------*
  Project:  Horizon
  File:     os_MemoryBlock.cpp

  Copyright (C)2009 Nintendo Co., Ltd.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law. They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Rev: 17610 $
 *---------------------------------------------------------------------------*/

#include <nn/config.h>
#if NN_PLATFORM_HAS_MMU


#include <nn/assert.h>
#include <nn/dbg/dbg_Logger.h>
#include <nn/os/os_CriticalSection.h>
#include <nn/os/os_Memory.h>
#include <nn/os/os_MemoryBlock.h>
#include <nn/os/os_MemoryMapSelect.h>
#include <nn/os/os_Result.h>
#include <nn/os/os_StackMemoryBlock.h>
#include <nn/svc/svc_Stub.h>
#include <nn/util/util_Result.h>

#include "os_AddressSpaceManager.h"

//---------------------------------------------------------------------------

using namespace nn;
using namespace nn::svc;

namespace nn{ namespace os{

    namespace
    {
        nnosAddressSpaceManager s_SpaceManager;
        bool s_IsMemoryBlockEnabled = false;
    }

    namespace detail
    {
        uptr AllocateFromMemoryBlockSpace(MemoryBlockBase* p, size_t s)
        {
            AddressSpaceManager* pManager = reinterpret_cast<AddressSpaceManager*>(&s_SpaceManager);
            return pManager->Allocate(p, s, 0);
        }
        void FreeToMemoryBlockSpace(MemoryBlockBase* p)
        {
            AddressSpaceManager* pManager = reinterpret_cast<AddressSpaceManager*>(&s_SpaceManager);
            pManager->Free(p);
        }
        void Switch(MemoryBlock* pTo, MemoryBlock* pFrom)
        {
            nnosAddressSpaceManagerSwitch(&s_SpaceManager, ConvertToC(pTo), ConvertToC(pFrom));
        }

        bool IsMemoryBlockEnabled()
        {
            return s_IsMemoryBlockEnabled;
        }
    }

void MemoryBlock::Initialize(size_t size)
{
    // Check that it is not initialized.
    NN_TASSERT_(detail::IsMemoryBlockEnabled());
    NN_TASSERT_(!GetAddress());

    // Get memory from the virtual address space.
    size = GetPageAlignedSize(size);
    uptr addr = detail::AllocateFromMemoryBlockSpace(this, size);
    if (addr == 0)
    {
        NN_TPANIC_("Out Of Memory.");
    }
    this->MemoryBlockBase::SetReadOnly(false);
}

void MemoryBlock::Finalize()
{
    if (GetAddress())
    {
        // Returns the memory block to the virtual memory space.
        detail::FreeToMemoryBlockSpace(this);
    }
}

// Sets the read only attribute.
void MemoryBlock::SetReadOnly(bool readOnly)
{
    NN_TASSERT_(GetAddress());
    if (IsReadOnly() == readOnly)
    {
        return;
    }
    this->MemoryBlockBase::SetReadOnly(readOnly);
}



void InitializeMemoryBlock(uptr begin, size_t size)
{
    s_IsMemoryBlockEnabled = true;
    nnosAddressSpaceManagerInitialize(&s_SpaceManager, begin, size);
}


}} // namespace nn::os


#include <new>
using namespace nn::os;

extern "C" {

// MemoryBlock

void nnosMemoryBlockAllocate(nnosMemoryBlock* p, size_t size)
{
    NN_TASSERT_(detail::IsMemoryBlockEnabled());
    new (p) MemoryBlock(size);
}

void nnosMemoryBlockSetReadOnly(nnosMemoryBlock* p, bool readOnly)
{
    MemoryBlock* pMemoryBlock = reinterpret_cast<MemoryBlock*>(p);
    pMemoryBlock->SetReadOnly(readOnly);
}

void nnosMemoryBlockFree(nnosMemoryBlock* p)
{
    MemoryBlock* pMemoryBlock = reinterpret_cast<MemoryBlock*>(p);
    pMemoryBlock->~MemoryBlock();
}

uptr nnosMemoryBlockGetAddress(nnosMemoryBlock* p)
{
    MemoryBlock* pMemoryBlock = reinterpret_cast<MemoryBlock*>(p);
    return pMemoryBlock->GetAddress();
}

size_t nnosMemoryBlockGetSize(nnosMemoryBlock* p)
{
    MemoryBlock* pMemoryBlock = reinterpret_cast<MemoryBlock*>(p);
    return pMemoryBlock->GetSize();
}

bool nnosMemoryBlockIsReadOnly(nnosMemoryBlock* p)
{
    MemoryBlock* pMemoryBlock = reinterpret_cast<MemoryBlock*>(p);
    return pMemoryBlock->IsReadOnly();
}


}
#endif  // if NN_PLATFORM_HAS_MMU