tsc.h

/*
 * Copyright (C) 2001,2002,2003,2004 Philippe Gerum <rpm@xenomai.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 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#ifndef _LIB_COBALT_POWERPC_TSC_H
#define _LIB_COBALT_POWERPC_TSC_H

static inline unsigned long long cobalt_read_tsc(void)
{
#if defined(__powerpc64__)
        unsigned long long t;

        __asm__ __volatile__("mftb %0\n":"=r"(t));
        return t;
#else   /* !__powerpc64__ */
        union {
                unsigned long long t;
                unsigned long v[2];
        } u;
        unsigned long __tbu;

        __asm__ __volatile__("1: mfspr %0,269\n"
                             "mfspr %1,268\n"
                             "mfspr %2,269\n"
                             "cmpw %2,%0\n"
                             "bne- 1b\n":"=r"(u.v[0]),
                             "=r"(u.v[1]), "=r"(__tbu));
        return u.t;
#endif /* __powerpc64__ */
}

#endif /* !_LIB_COBALT_POWERPC_TSC_H */