/**
* Nachos main entry point.
*
* @param args the command line arguments.
*/
public static void main(final String[] args) {
System.out.print("nachos 5.0j initializing...");
Lib.assertTrue(Machine.args == null);
Machine.args = args;
processArgs();
Config.load(configFileName);
// get the current directory (.)
baseDirectory = new File(new File("").getAbsolutePath());
// get the nachos directory (./nachos)
nachosDirectory = new File(baseDirectory, "nachos");
String testDirectoryName = Config.getString("FileSystem.testDirectory");
// get the test directory
if (testDirectoryName != null) {
testDirectory = new File(testDirectoryName);
} else {
// use ../test
testDirectory = new File(baseDirectory.getParentFile(), "test");
}
securityManager = new NachosSecurityManager(testDirectory);
privilege = securityManager.getPrivilege();
privilege.machine = new MachinePrivilege();
TCB.givePrivilege(privilege);
privilege.stats = stats;
securityManager.enable();
createDevices();
checkUserClasses();
autoGrader = (AutoGrader) Lib.constructObject(autoGraderClassName);
new TCB()
.start(
new Runnable() {
public void run() {
autoGrader.start(privilege);
}
});
}
private static void processArgs() {
for (int i = 0; i < args.length; ) {
String arg = args[i++];
if (arg.length() > 0 && arg.charAt(0) == '-') {
if (arg.equals("-d")) {
Lib.assertTrue(i < args.length, "switch without argument");
Lib.enableDebugFlags(args[i++]);
} else if (arg.equals("-h")) {
System.out.print(help);
System.exit(1);
} else if (arg.equals("-m")) {
Lib.assertTrue(i < args.length, "switch without argument");
try {
numPhysPages = Integer.parseInt(args[i++]);
} catch (NumberFormatException e) {
Lib.assertNotReached("bad value for -m switch");
}
} else if (arg.equals("-s")) {
Lib.assertTrue(i < args.length, "switch without argument");
try {
randomSeed = Long.parseLong(args[i++]);
} catch (NumberFormatException e) {
Lib.assertNotReached("bad value for -s switch");
}
} else if (arg.equals("-x")) {
Lib.assertTrue(i < args.length, "switch without argument");
shellProgramName = args[i++];
} else if (arg.equals("-z")) {
System.out.print(copyright);
System.exit(1);
}
// these switches are reserved for the autograder
else if (arg.equals("-[]")) {
Lib.assertTrue(i < args.length, "switch without argument");
configFileName = args[i++];
} else if (arg.equals("--")) {
Lib.assertTrue(i < args.length, "switch without argument");
autoGraderClassName = args[i++];
}
}
}
Lib.seedRandom(randomSeed);
}
/**
* Return the name of the process class that the kernel should use. In the multi-programming
* project, returns <tt>nachos.userprog.UserProcess</tt>. In the VM project, returns
* <tt>nachos.vm.VMProcess</tt>. In the networking project, returns
* <tt>nachos.network.NetProcess</tt>.
*
* @return the name of the process class that the kernel should use.
* @see nachos.userprog.UserKernel#run
* @see nachos.userprog.UserProcess
* @see nachos.vm.VMProcess
* @see nachos.network.NetProcess
*/
public static String getProcessClassName() {
if (processClassName == null) processClassName = Config.getString("Kernel.processClassName");
Lib.assertTrue(processClassName != null);
return processClassName;
}
/**
* Return the name of the shell program that a user-programming kernel must run. Make sure
* <tt>UserKernel.run()</tt> <i>always</i> uses this method to decide which program to run.
*
* @return the name of the shell program to run.
*/
public static String getShellProgramName() {
if (shellProgramName == null) shellProgramName = Config.getString("Kernel.shellProgram");
Lib.assertTrue(shellProgramName != null);
return shellProgramName;
}