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/*

 * This source file contains C code for PPC405 cycle counter timer utilities

 *

 * Redistributions of any form whatsoever must retain and/or include the

 * following acknowledgment, notices and disclaimer:

 *

 * This product includes software developed by Carnegie Mellon University.

 *

 * Copyright (c) 2006 by J. C. Hoe, Carnegie Mellon University

 *

 * You may not use the name "Carnegie Mellon University" or derivations

 * thereof to endorse or promote products derived from this software.

 *

 * If you modify the software you must place a notice on or within any

 * modified version provided or made available to any third party stating

 * that you have modified the software.  The notice shall include at least

 * your name, address, phone number, email address and the date and purpose

 * of the modification.

 *

 * THE SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY WARRANTY OF ANY KIND, EITHER

 * EXPRESS, IMPLIED OR STATUTORY, INCLUDING BUT NOT LIMITED TO ANY WARRANTY

 * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS OR BE ERROR-FREE AND ANY

 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,

 * TITLE, OR NON-INFRINGEMENT.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY

 * BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO DIRECT, INDIRECT,

 * SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM, OR IN

 * ANY WAY CONNECTED WITH THIS SOFTWARE (WHETHER OR NOT BASED UPON WARRANTY,

 * CONTRACT, TORT OR OTHERWISE).

 */

#define MHZ 300

typedef struct

{

    unsigned int upper;

    unsigned int lower;

} TIME_STAMP;

static long long ts_get_ll() {

        unsigned int upper, upper2;

        unsigned int lower;

        unsigned long long ans;

        unsigned int x;

        // see PPC405 programmer's manual for explanation

        do {

                asm volatile ("mftbu %[arg]" : [arg] "=r" (upper) : );

                asm volatile ("mftb %[arg]" : [arg] "=r" (lower) : );

                asm volatile ("mftbu %[arg]" : [arg] "=r" (upper2) : );

        } while (upper!=upper2);

        ans=upper;

        ans=ans<<32;

        ans|=lower;

        return ans;

}

static unsigned int ts_elapse_us(long long start, long long finish) {

        unsigned long long elapse=(finish-start);

        unsigned int xf=finish;

        unsigned int xs=start;

        elapse=elapse/MHZ;

        return elapse;

}

static unsigned int ts_elapse_ns(long long start, long long finish) {

        unsigned long long elapse=(finish-start);

        unsigned int xf=finish;

        unsigned int xs=start;

        elapse=(elapse*1000)/MHZ;

        return elapse;

}