/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.driver.textscreen.x86;
import javax.naming.NameNotFoundException;
import org.jnode.bootlog.BootLogInstance;
import org.jnode.driver.textscreen.TextScreen;
import org.jnode.naming.InitialNaming;
import org.jnode.system.resource.MemoryResource;
import org.jnode.system.resource.ResourceManager;
import org.jnode.system.resource.ResourceNotFreeException;
import org.jnode.system.resource.ResourceOwner;
import org.jnode.system.resource.SimpleResourceOwner;
import org.jnode.vm.Unsafe;
import org.vmmagic.unboxed.Address;
/**
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
public class PcTextScreen extends AbstractPcTextScreen {
/**
* The MemoryResource we use to store (and display) characters.
*/
private final MemoryResource memory;
/**
* For now, we use singleton (only one screen monitor). May change in the
* future.
*/
private static TextScreen instance;
/**
* Initialize this instance.
*/
private PcTextScreen() throws ResourceNotFreeException {
super(80, 25);
Address ptr = Address.fromIntZeroExtend(0xb8000);
try {
final ResourceManager rm = InitialNaming.lookup(ResourceManager.NAME);
final ResourceOwner owner = new SimpleResourceOwner("Screen");
memory = rm.claimMemoryResource(owner, ptr, getWidth()
* getHeight() * 2, ResourceManager.MEMMODE_NORMAL);
} catch (NameNotFoundException ex) {
throw new ResourceNotFreeException("ResourceManager not found", ex);
}
}
/**
* Get the singleton instance and create it if necessary.
*
* @return @throws
* PragmaUninterruptible
*/
public static TextScreen getInstance() {
if (instance == null) {
try {
instance = new PcTextScreen();
if (instance == null) {
Unsafe.debug("oops new does not work");
}
} catch (ResourceNotFreeException ex) {
BootLogInstance.get().error("Screen memory not free!");
}
}
return instance;
}
/**
* @see org.jnode.driver.textscreen.TextScreen#copyContent(int, int, int)
*/
@Override
public void copyContent(int srcOffset, int destOffset, int length) {
memory.copy(srcOffset * 2, destOffset * 2, length * 2);
}
/**
* @see org.jnode.driver.textscreen.TextScreen#getChar(int)
*/
@Override
public char getChar(int offset) {
return (char) (memory.getByte(offset * 2) & 0xFF);
}
/**
* @see org.jnode.driver.textscreen.TextScreen#getColor(int)
*/
@Override
public int getColor(int offset) {
return memory.getByte(offset * 2 + 1) & 0xFF;
}
/**
* @see org.jnode.driver.textscreen.TextScreen#set(int, char, int, int)
*/
@Override
public void set(int offset, char ch, int count, int color) {
final char v = (char) ((ch & 0xFF) | ((color & 0xFF) << 8));
memory.setChar(offset * 2, v, count);
}
/**
* @see org.jnode.driver.textscreen.TextScreen#set(int, char[], int, int,
* int)
*/
@Override
public void set(int offset, char[] ch, int chOfs, int length, int color) {
color = (color & 0xFF) << 8;
int chOffset = chOfs;
int ofs = offset * 2;
for (int i = 0; i < length; i++) {
final int v = (ch[chOffset++] & 0xFF) | color;
memory.setChar(ofs, (char) v);
ofs += 2;
}
}
/**
* @see org.jnode.driver.textscreen.TextScreen#set(int, char[], int, int,
* int[], int)
*/
@Override
public void set(int offset, char[] ch, int chOfs, int length, int[] colors,
int colorsOfs) {
int chOffset = chOfs;
int ofs = offset * 2;
int colOfs = colorsOfs;
for (int i = 0; i < length; i++) {
final int v = (ch[chOffset++] & 0xFF)
| ((colors[colOfs++] & 0xFF) << 8);
memory.setChar(ofs, (char) v);
ofs += 2;
}
}
/**
* Copy the content of the given rawData into this screen.
*
* @param rawData
* @param rawDataOffset
*/
@Override
public final void copyFrom(char[] rawData, int rawDataOffset) {
if (rawDataOffset < 0) {
Unsafe.die("Screen:rawDataOffset = " + rawDataOffset);
}
memory.setChars(rawData, rawDataOffset, 0, getWidth() * getHeight());
}
/**
* Copies the entire screen to the given destination. For this operation to
* succeed, the screens involved must be compatible.
*
* @param dst
*/
@Override
public void copyTo(TextScreen dst, int offset, int length) {
throw new UnsupportedOperationException();
}
/**
* Synchronize the state with the actual device.
*/
@Override
public void sync(int offset, int length) {
// Nothing to do here
}
@Override
public int setCursor(int x, int y) {
return 0; // TODO what should we return if we don't call instance.setCursor ?
}
@Override
public int setCursorVisible(boolean visible) {
return 0; //TODO
}
}