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////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 Martin Freij
//
// This file is part of Nestopia.
//
// Nestopia 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; either version 2 of the License, or
// (at your option) any later version.
//
// Nestopia 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 for more details.
//
// You should have received a copy of the GNU General Public License
// along with Nestopia; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
////////////////////////////////////////////////////////////////////////////////////////
#include <cstdlib>
#include <cstring>
#include "NstAssert.hpp"
#include "NstRam.hpp"
namespace Nes
{
namespace Core
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
Ram::Ram()
:
mem ( NULL ),
mask ( 0 ),
size ( 0 ),
type ( RAM ),
readable ( false ),
writable ( false ),
internal ( false )
{}
Ram::Ram(Type t,bool r,bool w,dword s,byte* m)
:
mem ( NULL ),
mask ( 0 ),
size ( 0 ),
type ( t ),
readable ( r ),
writable ( w ),
internal ( false )
{
Set( s, m );
}
Ram::Ram(const Ram& ram)
:
mem ( ram.mem ),
mask ( ram.mask ),
size ( ram.size ),
type ( ram.type ),
readable ( ram.readable ),
writable ( ram.writable ),
internal ( false ),
pins ( ram.pins )
{}
Ram::~Ram()
{
if (internal)
std::free( mem );
}
Ram& Ram::operator = (const Ram& ram)
{
if (this != &ram)
{
Destroy();
mem = ram.mem;
mask = ram.mask;
size = ram.size;
type = ram.type;
readable = ram.readable;
writable = ram.writable;
internal = false;
pins = ram.pins;
}
return *this;
}
void Ram::Destroy()
{
pins.Clear();
mask = 0;
size = 0;
if (byte* const tmp = mem)
{
mem = NULL;
if (internal)
{
internal = false;
std::free( tmp );
}
}
}
void Ram::Set(dword s,byte* m)
{
if (s)
{
dword prev = mask+1;
mask = s - 1;
mask |= mask >> 1;
mask |= mask >> 2;
mask |= mask >> 4;
mask |= mask >> 8;
mask |= mask >> 16;
size = s;
NST_VERIFY( s == mask+1 );
if (m)
{
if (internal)
{
internal = false;
std::free( mem );
}
}
else
{
m = static_cast<byte*>(std::realloc( internal ? mem : NULL, mask+1 ));
if (m)
{
if (!internal)
{
internal = true;
prev = 0;
}
if (prev < mask+1)
std::memset( m+prev, 0, mask+1-prev );
}
else
{
Destroy();
throw RESULT_ERR_OUT_OF_MEMORY;
}
}
mem = m;
}
else
{
Destroy();
}
}
void Ram::Set(Type t,bool r,bool w,dword s,byte* m)
{
Set( s, m );
type = t;
readable = r;
writable = w;
}
void Ram::Fill(uint value) const
{
NST_ASSERT( bool(mem) == bool(size) );
NST_VERIFY( value <= 0xFF );
std::memset( mem, value & 0xFF, size );
}
void Ram::Mirror(dword block)
{
NST_VERIFY( block );
if (block)
{
const dword nearest = mask+1;
if (internal || !size)
{
block--;
block |= block >> 1;
block |= block >> 2;
block |= block >> 4;
block |= block >> 8;
block |= block >> 16;
block++;
if (mask+1 < block)
{
const dword tmp = size;
Set( block );
size = tmp;
}
}
NST_ASSERT( nearest <= mask+1 && !((mask+1) & mask) && !(nearest & (nearest-1)) );
if (size)
{
for (block=nearest; size % block; )
block /= 2;
for (dword i=size, n=size-block; i != nearest; i += block)
std::memcpy( mem + i, mem + n, block );
for (dword i=nearest, n=mask+1; i != n; i += nearest)
std::memcpy( mem + i, mem, nearest );
}
}
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
}
}
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