source: trunk/packages/xen-3.1/xen-3.1/xen/include/asm-powerpc/delay.h @ 34

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (C) IBM Corp. 2005, 2006
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 *          Jimi Xenidis <jimix@watson.ibm.com>
 */

#ifndef _ASM_DELAY_H_
#define _ASM_DELAY_H_

#include <asm/time.h>

extern unsigned long ticks_per_usec; 
#define __udelay udelay
static inline void udelay(unsigned long usecs)
{
    unsigned long ticks = usecs * ticks_per_usec;
    unsigned long s;
    unsigned long e;

    s = get_timebase();
    do {
        e = get_timebase();
    } while ((e-s) < ticks);
}
#endif