pcibus.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 132 行

/*
 * $Id: PCIBus.java,v 1.2 2003/12/21 07:50:12 epr Exp $
 */
package org.jnode.driver.pci;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.log4j.Logger;
import org.jnode.driver.Bus;

/**
 * @author epr
 */
public class PCIBus extends Bus implements PCIConstants {
	
	/** My logger */
	private final Logger log = Logger.getLogger(getClass());
	/** The PCI system */
	private final PCIDriver pci;
	/** My numeric index */
	private final int bus;
	/** All devices connected to this bus */
	private final ArrayList list = new ArrayList();
	
	/**
	 * Initialize a root bus (bus 0)
	 * @param pci
	 */
	public PCIBus(Bus parent, PCIDriver pci) {
		super(parent);
		this.pci = pci;
		this.bus = 0;
	}
	
	public PCIBus(PCIBus parent, int bus) {
		super(parent);
		this.pci = parent.pci;
		this.bus = bus;
	}
	
	/**
	 * Gets the numeric index of this bus.
	 */
	public final int getBus() {
		return bus;
	}
	
	/**
	 * Probe for all devices connected to the this bus.
	 * @param result
	 */
	protected void probeDevices(List result) {
		log.debug("Probing PCI bus " + bus);
		list.clear();
		for (int i = 0; i < 32; i++) {
			PCIDevice dev = createDevice(i, 0);
			if (dev != null) {
				list.add(dev);
				if (dev.getConfig().isMultiFunctional()) {
					for (int f = 1; f < 8; f++) {
						dev = createDevice(i, f);
						if (dev != null) {
							list.add(dev);
						}
					}
				}
			}
		}
		// Add every found device to the result list
		result.addAll(list);
		// Now probe all bridges
		for (Iterator i = list.iterator(); i.hasNext(); ) {
			final PCIDevice dev = (PCIDevice)i.next();
			final PCIDeviceConfig cfg = dev.getConfig();
			if ((cfg.getBaseClass() == CLASS_BRIDGE) && (cfg.getSubClass() == SUBCLASS_BR_PCI)) {
				log.debug("Found PCI-PCI bridge " + dev.getPCIName());
				//int mybus = dev.getBus();
				//int primBus = cfg.getBridgePrimaryBus();
				//int secBus = cfg.getBridgeSecondaryBus();
				final PCIBus newBus = new PCIBus(this, cfg.getBridgeSecondaryBus());
				newBus.probeDevices(result);
			}

		}
	}
	
	/**
	 * Create a PCIDevice instance based on (1) the presence of the device 
	 * and (2) the class of the device.
	 * @param unit
	 * @param func
	 * @return A new PCIDevice for the given bus, unit and function or
	 * <code>null</code> if no device is present at the given bus, unit and function.
	 */
	private final PCIDevice createDevice(int unit, int func) {
		if (PCIDeviceConfig.isPresent(pci, bus, unit, func)) {
			//final int[] pciClass = PCIDeviceConfig.getPCIClass(this, bus, unit, func);
			//final int major = pciClass[0];
			//final int sub = pciClass[1];
			
			// No specific device class, so just create the default
			return new PCIDevice(this, unit, func);
		} else {
			return null;
		}
	}
	
	/**
	 * Return the list of PCI devices connected to this bus.
	 * @return A List containing all connected devices as instanceof PCIDevice.
	 */
	public List getDevices() {
		return list;
	}
	
	/**
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		return "PCIBus: " + bus;
	}

	/**
	 * @return
	 */
	final PCIDriver getPCI() {
		return this.pci;
	}

}