/*
* $Id$
*
* 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.vm.x86;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;
import org.jnode.system.resource.MemoryResource;
import org.jnode.system.resource.ResourceNotFreeException;
import org.jnode.annotation.MagicPermission;
import org.jnode.bootlog.BootLogInstance;
import org.vmmagic.unboxed.Address;
import org.vmmagic.unboxed.MagicUtils;
/**
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
@MagicPermission
final class MPConfigTable {
private final MemoryResource mem;
private static final byte[] ENTRY_LENGTH = {20, 8, 8, 8, 8};
private final List<MPEntry> entries;
private static final byte[] SIGNATURE = {'P', 'C', 'M', 'P'};
/**
* Initialize this instance.
*
* @param mem
*/
MPConfigTable(MemoryResource mem) {
this.mem = mem;
if (isValid()) {
this.entries = parse();
} else {
this.entries = null;
}
}
/**
* Does the table in the given memory resource have a valid signature?
*/
boolean isValid() {
for (int i = 0; i < SIGNATURE.length; i++) {
if (mem.getByte(i) != SIGNATURE[i]) {
// Invalid signature
return false;
}
}
final int specRev = mem.getByte(6);
if ((specRev != 0x01) && (specRev != 0x04)) {
// Invalid specification revision
return false;
}
return true;
}
/**
* Gets the number of entries
*/
public int getEntryCount() {
return mem.getChar(34);
}
/**
* Gets the length of this table in bytes.
*/
public int getBaseTableLength() {
return mem.getChar(4);
}
/**
* Gets the length of the extended table in bytes.
*/
public int getExtendedTableLength() {
return mem.getChar(40);
}
/**
* Gets the physical address of the local APIC.
*/
public Address getLocalApicAddress() {
return Address.fromIntZeroExtend(mem.getInt(36));
}
/**
* Gets the systems manufacturer identification string.
*/
public String getOemID() {
final byte[] data = new byte[8];
mem.getBytes(8, data, 0, data.length);
return new String(data).trim();
}
/**
* Gets the product family identification string.
*/
public String getProductID() {
final byte[] data = new byte[12];
mem.getBytes(16, data, 0, data.length);
return new String(data).trim();
}
/**
* Gets a list of all MP entries in this table.
*/
final List<MPEntry> entries() {
return this.entries;
}
/**
* Release all resource hold.
*/
final void release() {
mem.release();
}
/**
* @see java.lang.Object#toString()
*/
public String toString() {
return "MPConfigTable";
}
public void dump(PrintStream out) {
out.println("MPConfigTable");
out
.println("Address 0x"
+ MagicUtils.toString(mem.getAddress()));
out.println("Size " + MagicUtils.toString(mem.getSize()));
out.println("Manufacturer " + getOemID());
out.println("Product " + getProductID());
out.println("Local APIC ptr 0x"
+ MagicUtils.toString(getLocalApicAddress()));
out.println("Entries");
for (MPEntry e : entries) {
out.println(" " + e);
}
}
private final List<MPEntry> parse() {
final int cnt = getEntryCount();
final ArrayList<MPEntry> list = new ArrayList<MPEntry>(cnt);
int offset = 0x2C;
final int size = mem.getSize().toInt();
try {
while (offset < size) {
final int type = mem.getByte(offset);
final int len = ENTRY_LENGTH[type];
final MemoryResource mem = this.mem.claimChildResource(offset,
len, false);
final MPEntry entry;
switch (type) {
case 0:
entry = new MPProcessorEntry(mem);
break;
case 1:
entry = new MPBusEntry(mem);
break;
case 2:
entry = new MPIOAPICEntry(mem);
break;
case 3:
entry = new MPIOInterruptAssignmentEntry(mem);
break;
case 4:
entry = new MPLocalInterruptAssignmentEntry(mem);
break;
default:
entry = null;
}
list.add(entry);
offset += len;
}
} catch (ArrayIndexOutOfBoundsException ex) {
BootLogInstance.get().error("Error parsing the MP config table", ex);
} catch (ResourceNotFreeException ex) {
BootLogInstance.get().error("Cannot claim MP entry region");
}
return list;
}
}