Here is what JOS looks like on my machine. The "hardware" cursor always
stays at line 3, column 1. For sake of discussion, the first line at the
top of the screen is line 1.
[1] jJOS/decaf
[2] Processor type: "CyrixInstead"
[3] A20 OK, loading decaf...
[4] process_args("arch/i386/nativecode/jjos-binary init arg0 arg1")
[5] argvlocal[00000000] = arch/i386/nativecode/jjos-binary
[6] argvlocal[00000001] = init
[7] argvlocal[00000002] = arg0
[8] argvlocal[00000003] = arg1
[9] bailing out on #00000004
[10] init for jJOS/decaf, version 0.2
[11] init: generating keyboard driver...
[12] init: initializing keyboard driver...
[13] init: generating console daemon...
[14] init: initializing console daemon...
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Wow! This is the first time that the keyboard worked for me. I noticed that
key combinations aren't being interpreted as I expected. For example, A,
Alt+A and Control+A is printed as 'a'. So, we need a terminal application
for JOS.
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We must have a mechanism to load classes dynamically. There are lots of
classes that do not and should not go inside classes.zip.
When booting with Etherboot, I would like to use the network. If I have
java.sql in a package file called /jpkg/java.sql.package on my HTTP
service, JOS should be able to download it using the java.net package.
When booting with GRUB, I would like to load additional package files from
the /jpkg directory. It seems that GRUB might be less complex. It might use
a class that reads sectors from a disk. If such a class were added to
classes.zip, a program could use it to read additional packages. If code
for this class were compiled directly into jJOS/decaf, it could load
classes.zip.
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For asynchonous I/O, each device has a corresponding listener interface.
The run() method might run a device until it is closed. I think we might
need both a low-level keyboard class and a high-level keyboard class. The
low-level class should be jos.device.keyboard (right?) The high-level class
could be org.jos.device.Keyboard. Here is more about a asynchronous
user-level keyboard driver:
// Shell.java
import org.jos.device.Keyboard;
import org.jos.device.KeyboardEvent;
public class Terminal
implements KeyboardListener {
private static final char LF = '\n';
public Terminal() {
}
public void run() {
String s = "bcni:org.jos.device.Keyboard";
keyboard = (Keyboard) Factory.getObject( s );
if ( keyboard == null ) {
return;
}
keyboard.setListener( this );
keyboard.run();
}
public void onKey( Key v ) {
if ( v.equals( Key.ctrlC ) ) {
keyboard.close();
}
print( v.toChar() );
}
public void print( String v ) {
int iMax = v.length();
for ( int i = 0; i < iMax; i++ ) {
char ch = v.charAt( i );
if ( ch == BS ) {
gotoxy( row, column-- );
continue;
}
if ( ch == LF ) {
gotoxy( row++, (column = 0) );
continue;
}
gotoxy( row, column++ );
putch( ch );
}
}
public void println( String v ) {
print( v + LF );
}
private Keyboard keyboard;
}
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