clock.c

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    1 /*-
    2  * Copyright (c) 2001 Jake Burkholder.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/pcpu.h>
   33 #include <sys/proc.h>
   34 #include <sys/sched.h>
   35 
   36 #include <machine/cpu.h>
   37 #include <machine/cpufunc.h>
   38 
   39 void
   40 DELAY(int usec)
   41 {
   42         u_long end;
   43 
   44         if (usec < 0)
   45                 return;
   46 
   47         /*
   48          * We avoid being migrated to another CPU with a possibly
   49          * unsynchronized TICK timer while spinning.
   50          */
   51         sched_pin();
   52 
   53         end = rd(tick) + (u_long)usec * PCPU_GET(clock) / 1000000;
   54         while (rd(tick) < end)
   55                 cpu_spinwait();
   56 
   57         sched_unpin();
   58 }
   59 
   60 void
   61 cpu_startprofclock(void)
   62 {
   63 
   64 }
   65 
   66 void
   67 cpu_stopprofclock(void)
   68 {
   69 
   70 }

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FreeBSD/Linux Kernel Cross Reference sys/sparc64/sparc64/clock.c

FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/clock.c