FreeBSD/Linux Kernel Cross Reference
sys/sys/cc_microtime.h

     /*      $NetBSD: cc_microtime.h,v 1.3 2006/06/07 22:34:18 kardel Exp $  */
     
     /*-
      * Copyright (c) 2004 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *        This product includes software developed by the NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef _SYS_CC_MICROTIME_H_
    #define _SYS_CC_MICROTIME_H_
    
    #ifndef __HAVE_TIMECOUNTER
    extern struct timeval cc_microset_time;
    void cc_microtime(struct timeval *);
    void cc_microset(struct cpu_info *);
    
    /*
     * Variables used by cc_microtime().
     */
    struct cc_microtime_state {
            struct timeval cc_time;
            int64_t cc_cc;
            int64_t cc_ms_delta;
            int64_t cc_denom;
    };
    #else
    /* XXX this file is not named right - rather something like tsc.h */
    void tsc_calibrate_cpu(struct cpu_info *);
    /*
     * Variables used by cc_microtime().
     */
    struct cc_microtime_state {
            volatile u_int   cc_gen;   /* generation number for this data set */
            volatile int64_t cc_val;   /* reference TSC value at calibration time */
            volatile int64_t cc_cc;    /* local TSC value at calibration time */
            volatile int64_t cc_delta; /* reference TSC difference for
                                          last calibration period */
            volatile int64_t cc_denom; /* local TSC difference for
                                          last calibration period */
    };
    #endif /* __HAVE_TIMECOUNTER */
    
    #endif /* _SYS_CC_MICROTIME_H_ */

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