standardvgaio.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 150 行

/*
 * $Id: StandardVGAIO.java,v 1.1 2003/11/25 11:51:34 epr Exp $
 */
package org.jnode.driver.video.vga;

import javax.naming.NameNotFoundException;

import org.jnode.driver.video.vgahw.VgaConstants;
import org.jnode.driver.video.vgahw.VgaIO;
import org.jnode.naming.InitialNaming;
import org.jnode.system.IOResource;
import org.jnode.system.MemoryResource;
import org.jnode.system.ResourceManager;
import org.jnode.system.ResourceNotFreeException;
import org.jnode.system.ResourceOwner;

/**
 * @author epr
 */
public class StandardVGAIO implements VgaConstants, VgaIO {

	/** VGA IO Ports */
	private final IOResource vgaIO;
	private final MemoryResource mem;

	/* current state information */
	private int current_mode;

	/**
	 * Create a new instance
	 */
	public StandardVGAIO(ResourceOwner owner, MemoryResource mem) throws ResourceNotFreeException {
		try {
			ResourceManager rm = (ResourceManager) InitialNaming.lookup(ResourceManager.NAME);
			vgaIO = rm.claimIOResource(owner, VGA_FIRST_PORT, VGA_LAST_PORT - VGA_FIRST_PORT + 1);
			this.mem = mem;
			current_mode = getColorMode();
		} catch (NameNotFoundException ex) {
			throw new ResourceNotFreeException("Cannot find ResourceManager", ex);
		}
	}

	/**
	 * Release all resource
	 */
	public void release() {
		vgaIO.release();
	}

	public final void setATTIndex(int index) {
		getSTAT();
		vgaIO.outPortByte(ATT_I, index);
	}

	public final void setATT(int index, int val) {
		getSTAT();
		vgaIO.outPortByte(ATT_I, index);
		vgaIO.outPortByte(ATT_I, (byte) val);
	}

	public final int getATT(int index) {
		getSTAT();
		vgaIO.outPortByte(ATT_I, (byte) (index));
		return vgaIO.inPortByte(ATT_R);
	}

	public final void setMISC(int val) {
		setSEQ(0, 1);
		vgaIO.outPortByte(MISC_W, (byte) val);
		setSEQ(0, 3);
		current_mode = val & 0x01;
	}

	public final int getMISC() {
		return vgaIO.inPortByte(MISC_R);
	}

	public final void setSEQ(int index, int val) {
		vgaIO.outPortByte(SEQ_I, (byte) index);
		vgaIO.outPortByte(SEQ_D, (byte) val);
	}

	public final int getSEQ(int index) {
		vgaIO.outPortByte(SEQ_I, (byte) index);
		return vgaIO.inPortByte(SEQ_D);
	}

	public final int getSTAT() {
		if (current_mode == 0) {
			return vgaIO.inPortByte(STATM);
		} else {
			return vgaIO.inPortByte(STATC);
		}
	}

	public final void setGRAF(int index, int val) {
		vgaIO.outPortByte(GRAF_I, (byte) index);
		vgaIO.outPortByte(GRAF_D, (byte) val);
	}

	public final int getGRAF(int index) {
		vgaIO.outPortByte(GRAF_I, (byte) index);
		return vgaIO.inPortByte(GRAF_D);
	}

	public final void setCRT(int index, int val) {
		if (current_mode == 1) {
			vgaIO.outPortByte(CRTC_I, (byte) index);
			vgaIO.outPortByte(CRTC_D, (byte) val);
		} else {
			vgaIO.outPortByte(CRTC_IM, (byte) index);
			vgaIO.outPortByte(CRTC_DM, (byte) val);
		}
	}

	public final int getCRT(int index) {
		if (current_mode == 1) {
			vgaIO.outPortByte(CRTC_I, (byte) index);
			return vgaIO.inPortByte(CRTC_D);
		} else {
			vgaIO.outPortByte(CRTC_IM, (byte) index);
			return vgaIO.inPortByte(CRTC_DM);
		}
	}

	public final void setDACReadIndex(int index) {
		vgaIO.outPortByte(DAC_RI, index & 0xFF);
	}
	
	public final void setDACWriteIndex(int index) {
		vgaIO.outPortByte(DAC_WI, index & 0xFF);
	}
	
	public final void setDACData(int data) {
		vgaIO.outPortByte(DAC_D, data & 0xFF);		
	}

	public final int getDACData() {
		return vgaIO.inPortByte(DAC_D) & 0xFF;		
	}

	
	public final MemoryResource getVideoMem() {
		return mem;
	}

	private final int getColorMode() {
		return (vgaIO.inPortByte(MISC_R) & 1);
	}
}