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_rtc.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: stable/9/sys/i386/xen/xen_rtc.c 193032 2009-05-29 13:36:06Z adrian $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/9/sys/i386/xen/xen_rtc.c 193032 2009-05-29 13:36:06Z adrian $");
   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 #include "clock_if.h"
   56 
   57 static int
   58 xen_rtc_probe(device_t dev)
   59 {
   60         device_set_desc(dev, "Xen Hypervisor Clock");
   61         printf("[XEN] xen_rtc_probe: probing Hypervisor RTC clock\n");
   62         if (! HYPERVISOR_shared_info) {
   63                 device_printf(dev, "No hypervisor shared page found; RTC can not start.\n");
   64                 return (EINVAL);
   65         }
   66         return (0);
   67 }
   68 
   69 static int
   70 xen_rtc_attach(device_t dev)
   71 {
   72         printf("[XEN] xen_rtc_attach: attaching Hypervisor RTC clock\n");
   73         clock_register(dev, 1000000);
   74         return(0);
   75 }
   76 
   77 static int
   78 xen_rtc_settime(device_t dev __unused, struct timespec *ts)
   79 {
   80         device_printf(dev, "[XEN] xen_rtc_settime\n");
   81         /*
   82          * Don't return EINVAL here; just silently fail if the domain isn't privileged enough
   83          * to set the TOD.
   84          */
   85         return(0);
   86 }
   87 
   88 /*
   89  * The Xen time structures document the hypervisor start time and the
   90  * uptime-since-hypervisor-start (in nsec.) They need to be combined
   91  * in order to calculate a TOD clock.
   92  */
   93 static int
   94 xen_rtc_gettime(device_t dev, struct timespec *ts)
   95 {
   96         struct timespec w_ts, u_ts;
   97 
   98         device_printf(dev, "[XEN] xen_rtc_gettime\n");
   99         xen_fetch_wallclock(&w_ts);
  100         device_printf(dev, "[XEN] xen_rtc_gettime: wallclock %ld sec; %ld nsec\n", (long int) w_ts.tv_sec, (long int) w_ts.tv_nsec);
  101         xen_fetch_uptime(&u_ts);
  102         device_printf(dev, "[XEN] xen_rtc_gettime: uptime %ld sec; %ld nsec\n", (long int) u_ts.tv_sec, (long int) u_ts.tv_nsec);
  103 
  104         timespecclear(ts);
  105         timespecadd(ts, &w_ts);
  106         timespecadd(ts, &u_ts);
  107 
  108         device_printf(dev, "[XEN] xen_rtc_gettime: TOD %ld sec; %ld nsec\n", (long int) ts->tv_sec, (long int) ts->tv_nsec);
  109 
  110         return(0);
  111 }
  112 
  113 static void
  114 xen_rtc_identify(driver_t *drv, device_t parent)
  115 {
  116         BUS_ADD_CHILD(parent, 0, "rtc", 0);
  117 }
  118 
  119 static device_method_t xen_rtc_methods[] = {
  120         /* Device interface */
  121         DEVMETHOD(device_probe,         xen_rtc_probe),
  122         DEVMETHOD(device_attach,        xen_rtc_attach),
  123         DEVMETHOD(device_identify,      xen_rtc_identify),
  124 
  125         DEVMETHOD(device_detach,        bus_generic_detach),
  126         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  127 
  128         /* clock interface */
  129         DEVMETHOD(clock_gettime,        xen_rtc_gettime),
  130         DEVMETHOD(clock_settime,        xen_rtc_settime),
  131 
  132         { 0, 0 }
  133 };
  134 
  135 
  136 static driver_t xen_rtc_driver = {
  137         "rtc",
  138         xen_rtc_methods,
  139         0
  140 };
  141 
  142 static devclass_t xen_rtc_devclass;
  143 
  144 DRIVER_MODULE(rtc, nexus, xen_rtc_driver, xen_rtc_devclass, 0, 0);

Cache object: 125f43f7c7b6af7d21d8df0716f38540


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