/*
 * This file is part of the coreboot project.
 *
 * It is based on the file js/src/jscpucfg.c from Mozilla, CVS rev. 3.25.
 * See http://lxr.mozilla.org/mozilla1.8.0/source/js/src/jscpucfg.c.
 */

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/**
 * return the truncated log2 of the number. 
 * @param n number to take the log of
 * @return log2 of the smallest integer that is a power of of 2 
 * and that is <= to the parameter. E.g. log2f(72) is 6. 
 */ 
int log2f(unsigned int n)
{
	int log2 = 0;
	if (n >> 16)
		log2 += 16, n >>= 16;
	if (n >> 8)
		log2 += 8, n >>= 8;
	if (n >> 4)
		log2 += 4, n >>= 4;
	if (n >> 2)
		log2 += 2, n >>= 2;
	if (n >> 1)
		log2++;
	return log2;
}

/**
 * return the log2 of the number in integer form, rounded up as needed. 
 * @param n number to take the log of
 * @return log2 of the smallest integer that is a power of 2
 * that is >= to the parameter. E.g. log2(72) is 7. 
 */ 
int log2c(unsigned int n)
{
	int log2 = 0;

	if (n & (n - 1))
		log2++;
	return log2 + log2f(n);
}