mirror of
https://github.com/RetroDECK/Supermodel.git
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157 lines
4.3 KiB
C++
157 lines
4.3 KiB
C++
/**
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** Supermodel
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** A Sega Model 3 Arcade Emulator.
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** Copyright 2011 Bart Trzynadlowski, Nik Henson
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**
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** This file is part of Supermodel.
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**
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** Supermodel is free software: you can redistribute it and/or modify it under
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** the terms of the GNU General Public License as published by the Free
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** Software Foundation, either version 3 of the License, or (at your option)
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** any later version.
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**
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** Supermodel is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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** more details.
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**
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** You should have received a copy of the GNU General Public License along
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** with Supermodel. If not, see <http://www.gnu.org/licenses/>.
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**/
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/*
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* PCI.cpp
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*
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* PCI bus and device emulation. Implementation of the CPCIBus class.
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* IPCIDevice is just a base class from which others are derived. Only the
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* transfer of PCI register data is emulated. Device functionality is
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* handled by device objects (derived from IPCIDevice).
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*
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* TO-DO List:
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* -----------
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* - Exception handling for out-of-memory errors in STL? Right now, we assume
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* the vectors do not run out of memory because so few PCI devices exist.
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*/
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#include "PCI.h"
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#include "Supermodel.h"
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/******************************************************************************
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Emulation Functions
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******************************************************************************/
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/*
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* CPCIBus::ReadConfigSpace(device, reg, bits offset):
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*
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* Reads a PCI register belonging to a particular device.
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*/
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UINT32 CPCIBus::ReadConfigSpace(unsigned device, unsigned reg, unsigned bits, unsigned offset)
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{
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unsigned i;
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// Alignment check
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#ifdef DEBUG
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if (((bits==16)&&(offset&1)) || ((bits==32)&&(offset&3)))
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ErrorLog("Misaligned PCI read request (device=%d,reg=%X,offset=%d)\n", device, reg, offset);
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#endif
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// Search device vector for a matching device
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for (i = 0; i < DeviceVector.size(); i++)
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{
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if (DeviceVector[i].device == device)
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return DeviceVector[i].DeviceObject->ReadPCIConfigSpace(device, reg, bits, offset);
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}
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DebugLog("PCI read request for unknown device (device=%d,reg=%X)\n", device, reg);
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return 0;
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}
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/*
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* CPCIBus::WriteConfigSpace(device, reg, bits, offset, data):
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*
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* Writes to the PCI configuration space register belonging to a particular
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* device.
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*/
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void CPCIBus::WriteConfigSpace(unsigned device, unsigned reg, unsigned bits, unsigned offset, UINT32 data)
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{
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unsigned i;
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// Search device vector for a matching device
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for (i = 0; i < DeviceVector.size(); i++)
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{
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if (DeviceVector[i].device == device)
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{
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DeviceVector[i].DeviceObject->WritePCIConfigSpace(device, reg, bits, offset, data);
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return;
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}
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}
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// printf("PCI write request for unknown device (device=%d, reg=%X, data=%X)\n", device, reg, data);
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DebugLog("PCI write request for unknown device (device=%d, reg=%X, data=%X)\n", device, reg, data);
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}
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/*
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* CPCIBus::Reset():
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*
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* Resets the PCI bus emulation only. The devices attached to the bus are NOT
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* reset or accessed.
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*/
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void CPCIBus::Reset(void)
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{
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// this function really only exists for consistency with other device classes
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}
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/******************************************************************************
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Configuration, Initialization, and Shutdown
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******************************************************************************/
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/*
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* CPCIBus::AttachDevice(device, DeviceObjectPtr):
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*
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* Attaches a device to the PCI bus. This means it is added to a list of
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* devices to scan when handling PCI configuration space requests.
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*/
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void CPCIBus::AttachDevice(unsigned device, IPCIDevice *DeviceObjectPtr)
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{
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struct DeviceObjectLink D;
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D.device = device;
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D.DeviceObject = DeviceObjectPtr;
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DeviceVector.push_back(D);
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DebugLog("Attached device %d to PCI bus\n", device);
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}
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/*
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* CPCIBus::Init():
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*
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* This must be called first and only once during the lifetime of the class.
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*/
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void CPCIBus::Init(void)
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{
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DeviceVector.clear();
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}
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/*
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* CPCIBus::CPCIBus(void):
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*
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* Constructor.
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*/
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CPCIBus::CPCIBus(void)
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{
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DebugLog("Built PCI bus\n");
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}
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/*
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* CPCIBus::~CPCIBus(void):
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*
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* Destructor.
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*/
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CPCIBus::~CPCIBus(void)
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{
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DebugLog("Destroyed PCI bus\n");
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}
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