dolphin/Source/Plugins/Plugin_DSP_NULL/Src/UCodes/UCode_ROM.cpp

114 lines
2.8 KiB
C++

// Copyright (C) 2003-2008 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.
// 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 "Common.h"
#include "../Globals.h"
#include "../DSPHandler.h"
#include "UCodes.h"
#include "UCode_ROM.h"
CUCode_Rom::CUCode_Rom(CMailHandler& _rMailHandler)
: IUCode(_rMailHandler)
, m_BootTask_numSteps(0)
, m_NextParameter(0)
{
DebugLog("UCode_Rom - initialized");
m_rMailHandler.Clear();
m_rMailHandler.PushMail(0x8071FEED);
}
CUCode_Rom::~CUCode_Rom()
{}
void CUCode_Rom::Update()
{}
void CUCode_Rom::HandleMail(u32 _uMail)
{
if (m_NextParameter == 0)
{
// wait for beginning of UCode
if ((_uMail & 0xFFFF0000) != 0x80F30000)
{
u32 Message = 0xFEEE0000 | (_uMail & 0xFFFF);
m_rMailHandler.PushMail(Message);
}
else
{
m_NextParameter = _uMail;
}
}
else
{
switch (m_NextParameter)
{
case 0x80F3A001:
m_CurrentUCode.m_RAMAddress = _uMail;
break;
case 0x80F3A002:
m_CurrentUCode.m_Length = _uMail;
break;
case 0x80F3C002:
m_CurrentUCode.m_IMEMAddress = _uMail;
break;
case 0x80F3B002:
m_CurrentUCode.m_Unk = _uMail;
break;
case 0x80F3D001:
{
m_CurrentUCode.m_StartPC = _uMail;
BootUCode();
return; // FIXES THE OVERWRITE
}
break;
}
// THE GODDAMN OVERWRITE WAS HERE. Without the return above, since BootUCode may delete "this", well ...
m_NextParameter = 0;
}
}
void CUCode_Rom::BootUCode()
{
// simple non-scientific crc invented by ector :P
// too annoying to change now, and probably good enough anyway
u32 crc = 0;
for (u32 i = 0; i < m_CurrentUCode.m_Length; i++)
{
crc ^= Memory_Read_U8(m_CurrentUCode.m_RAMAddress + i);
//let's rol
crc = (crc << 3) | (crc >> 29);
}
DebugLog("CurrentUCode SOURCE Addr: 0x%08x", m_CurrentUCode.m_RAMAddress);
DebugLog("CurrentUCode Length: 0x%08x", m_CurrentUCode.m_Length);
DebugLog("CurrentUCode DEST Addr: 0x%08x", m_CurrentUCode.m_IMEMAddress);
DebugLog("CurrentUCode ???: 0x%08x", m_CurrentUCode.m_Unk);
DebugLog("CurrentUCode init_vector: 0x%08x", m_CurrentUCode.m_StartPC);
DebugLog("CurrentUCode CRC: 0x%08x", crc);
DebugLog("BootTask - done");
CDSPHandler::GetInstance().SetUCode(crc);
}