The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/xen/xen_clock_util.c

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    1 /*-
    2  * Copyright (c) 2009 Adrian Chadd
    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  * $FreeBSD: releng/8.4/sys/i386/xen/xen_clock_util.c 199583 2009-11-20 15:27:52Z jhb $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/8.4/sys/i386/xen/xen_clock_util.c 199583 2009-11-20 15:27:52Z jhb $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/clock.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/time.h>
   41 
   42 #include <xen/xen_intr.h>
   43 #include <vm/vm.h>
   44 #include <vm/pmap.h>
   45 #include <machine/pmap.h>
   46 #include <xen/hypervisor.h>
   47 #include <machine/xen/xen-os.h>
   48 #include <machine/xen/xenfunc.h>
   49 #include <xen/interface/io/xenbus.h>
   50 #include <xen/interface/vcpu.h>
   51 #include <machine/cpu.h>
   52 
   53 #include <machine/xen/xen_clock_util.h>
   54 
   55 /*
   56  * Read the current hypervisor start time (wall clock) from Xen.
   57  */
   58 void
   59 xen_fetch_wallclock(struct timespec *ts)
   60 { 
   61         shared_info_t *s = HYPERVISOR_shared_info;
   62         uint32_t ts_version;
   63    
   64         do {
   65                 ts_version = s->wc_version;
   66                 rmb();
   67                 ts->tv_sec  = s->wc_sec;
   68                 ts->tv_nsec = s->wc_nsec;
   69                 rmb();
   70         }
   71         while ((s->wc_version & 1) | (ts_version ^ s->wc_version));
   72 }
   73 
   74 /*
   75  * Read the current hypervisor system uptime value from Xen.
   76  */
   77 void
   78 xen_fetch_uptime(struct timespec *ts)
   79 {
   80         shared_info_t           *s = HYPERVISOR_shared_info;
   81         struct vcpu_time_info   *src;
   82         struct shadow_time_info dst;
   83         uint32_t pre_version, post_version;
   84         
   85         src = &s->vcpu_info[smp_processor_id()].time;
   86 
   87         spinlock_enter();
   88         do {
   89                 pre_version = dst.version = src->version;
   90                 rmb();
   91                 dst.system_timestamp  = src->system_time;
   92                 rmb();
   93                 post_version = src->version;
   94         }
   95         while ((pre_version & 1) | (pre_version ^ post_version));
   96 
   97         spinlock_exit();
   98 
   99         ts->tv_sec = dst.system_timestamp / 1000000000;
  100         ts->tv_nsec = dst.system_timestamp % 1000000000;
  101 }

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