/*
JPC: An x86 PC Hardware Emulator for a pure Java Virtual Machine
Release Version 2.4
A project from the Physics Dept, The University of Oxford
Copyright (C) 2007-2010 The University of Oxford
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as published by
the Free Software Foundation.
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 for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Details (including contact information) can be found at:
jpc.sourceforge.net
or the developer website
sourceforge.net/projects/jpc/
Conceived and Developed by:
Rhys Newman, Ian Preston, Chris Dennis
End of licence header
*/
package org.jpc.emulator.pci;
import org.jpc.emulator.motherboard.InterruptController;
import org.jpc.emulator.HardwareComponent;
import java.io.*;
/**
* Emulates the PCI-ISA bridge functionality of the Intel 82371SB PIIX3
* southbridge.
* <p>
* The key function of this component is the interfacing between the PCI
* components and the interrupt controller that forms part of the southbridge.
* @author Chris Dennis
*/
public class PCIISABridge extends AbstractPCIDevice
{
private int irqLevels[][];
private InterruptController irqDevice;
/**
* Constructs the (singleton) PCI-ISA bridge instance for attachment to a
* PCI bus.
*/
public PCIISABridge()
{
irqLevels = new int[4][2];
putConfigWord(PCI_CONFIG_VENDOR_ID, (short)0x8086); // Intel
putConfigWord(PCI_CONFIG_DEVICE_ID, (short)0x7000); // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
putConfigWord(PCI_CONFIG_CLASS_DEVICE, (short)0x0601); // ISA Bridge
putConfigByte(PCI_CONFIG_HEADER, (byte)0x80); // PCI_multifunction
this.internalReset();
}
public void saveState(DataOutput output) throws IOException
{
super.saveState(output);
output.writeInt(irqLevels.length);
output.writeInt(irqLevels[0].length);
for (int[] inner : irqLevels)
for (int level : inner)
output.writeInt(level);
}
public void loadState(DataInput input) throws IOException
{
super.reset();
super.loadState(input);
int len = input.readInt();
int width = input.readInt();
irqLevels = new int[len][width];
for (int i = 0; i < len; i++)
for (int j = 0; j < width; j++)
irqLevels[i][j] = input.readInt();
}
private void internalReset()
{
putConfigWord(PCI_CONFIG_COMMAND, (short)0x0007); // master, memory and I/O
putConfigWord(PCI_CONFIG_STATUS, (short)0x0200); // PCI_status_devsel_medium
putConfigByte(0x4c, (byte)0x4d);
putConfigByte(0x4e, (byte)0x03);
putConfigByte(0x4f, (byte)0x00);
putConfigByte(0x60, (byte)0x80);
putConfigByte(0x69, (byte)0x02);
putConfigByte(0x70, (byte)0x80);
putConfigByte(0x76, (byte)0x0c);
putConfigByte(0x77, (byte)0x0c);
putConfigByte(0x78, (byte)0x02);
putConfigByte(0x79, (byte)0x00);
putConfigByte(0x80, (byte)0x00);
putConfigByte(0x82, (byte)0x00);
putConfigByte(0xa0, (byte)0x08);
putConfigByte(0xa2, (byte)0x00);
putConfigByte(0xa3, (byte)0x00);
putConfigByte(0xa4, (byte)0x00);
putConfigByte(0xa5, (byte)0x00);
putConfigByte(0xa6, (byte)0x00);
putConfigByte(0xa7, (byte)0x00);
putConfigByte(0xa8, (byte)0x0f);
putConfigByte(0xaa, (byte)0x00);
putConfigByte(0xab, (byte)0x00);
putConfigByte(0xac, (byte)0x00);
putConfigByte(0xae, (byte)0x00);
}
private void setIRQ(PCIDevice device, int irqNumber, int level)
{
irqNumber = this.slotGetPIRQ(device, irqNumber);
int irqIndex = device.getIRQIndex();
int shift = (irqIndex & 0x1f);
int p = irqLevels[irqNumber][irqIndex >> 5];
irqLevels[irqNumber][irqIndex >> 5] = (p & ~(1 << shift)) | (level << shift);
/* now we change the pic irq level according to the piix irq mappings */
int picIRQ = this.configReadByte(0x60 + irqNumber); //short/int/long?
if (picIRQ < 16) {
/* the pic level is the logical OR of all the PCI irqs mapped to it */
int picLevel = 0;
for (int i = 0; i < 4; i++) {
if (picIRQ == this.configReadByte(0x60 + i))
picLevel |= getIRQLevel(i);
}
irqDevice.setIRQ(picIRQ, picLevel);
}
}
private int getIRQLevel(int irqNumber)
{
for(int i = 0; i < PCIBus.PCI_IRQ_WORDS; i++) {
if (irqLevels[irqNumber][i] != 0) {
return 1;
}
}
return 0;
}
IRQBouncer makeBouncer(PCIDevice device)
{
return new DefaultIRQBouncer();
}
int slotGetPIRQ(PCIDevice device, int irqNumber)
{
int slotAddEnd;
slotAddEnd = (device.getDeviceFunctionNumber() >> 3);
return (irqNumber + slotAddEnd) & 0x3;
}
private class DefaultIRQBouncer implements IRQBouncer
{
DefaultIRQBouncer()
{
}
public void setIRQ(PCIDevice device, int irqNumber, int level)
{
PCIISABridge.this.setIRQ(device, irqNumber, level);
}
}
public IORegion getIORegion(int index)
{
return null;
}
public IORegion[] getIORegions()
{
return null;
}
public void reset()
{
irqDevice = null;
putConfigWord(PCI_CONFIG_VENDOR_ID, (short)0x8086); // Intel
putConfigWord(PCI_CONFIG_DEVICE_ID, (short)0x7000); // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
putConfigWord(PCI_CONFIG_CLASS_DEVICE, (short)0x0601); // ISA Bridge
putConfigByte(PCI_CONFIG_HEADER, (byte)0x80); // PCI_multifunction
internalReset();
super.reset();
}
public boolean initialised()
{
return (irqDevice != null) && super.initialised();
}
public void acceptComponent(HardwareComponent component)
{
if ((component instanceof InterruptController) && component.initialised())
irqDevice = (InterruptController)component;
super.acceptComponent(component);
}
public boolean updated()
{
return (irqDevice.updated()) && super.updated();
}
public void updateComponent(HardwareComponent component)
{
// if ((component instanceof InterruptController)
// && component.updated())
// irqDevice = (InterruptController)component;
super.acceptComponent(component);
}
public String toString()
{
return "Intel 82371SB PIIX3 PCI ISA Bridge";
}
}