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/*-
* Copyright (c) 2009 Adrian Chadd
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/clock.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/time.h>
#include <xen/xen_intr.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/pmap.h>
#include <xen/hypervisor.h>
#include <machine/xen/xen-os.h>
#include <machine/xen/xenfunc.h>
#include <xen/interface/io/xenbus.h>
#include <xen/interface/vcpu.h>
#include <machine/cpu.h>
#include <machine/xen/xen_clock_util.h>
#include "clock_if.h"
static int
xen_rtc_probe(device_t dev)
{
device_set_desc(dev, "Xen Hypervisor Clock");
printf("[XEN] xen_rtc_probe: probing Hypervisor RTC clock\n");
if (! HYPERVISOR_shared_info) {
device_printf(dev, "No hypervisor shared page found; RTC can not start.\n");
return (EINVAL);
}
return (0);
}
static int
xen_rtc_attach(device_t dev)
{
printf("[XEN] xen_rtc_attach: attaching Hypervisor RTC clock\n");
clock_register(dev, 1000000);
return(0);
}
static int
xen_rtc_settime(device_t dev __unused, struct timespec *ts)
{
device_printf(dev, "[XEN] xen_rtc_settime\n");
/*
* Don't return EINVAL here; just silently fail if the domain isn't privileged enough
* to set the TOD.
*/
return(0);
}
/*
* The Xen time structures document the hypervisor start time and the
* uptime-since-hypervisor-start (in nsec.) They need to be combined
* in order to calculate a TOD clock.
*/
static int
xen_rtc_gettime(device_t dev, struct timespec *ts)
{
struct timespec w_ts, u_ts;
device_printf(dev, "[XEN] xen_rtc_gettime\n");
xen_fetch_wallclock(&w_ts);
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);
xen_fetch_uptime(&u_ts);
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);
timespecclear(ts);
timespecadd(ts, &w_ts);
timespecadd(ts, &u_ts);
device_printf(dev, "[XEN] xen_rtc_gettime: TOD %ld sec; %ld nsec\n", (long int) ts->tv_sec, (long int) ts->tv_nsec);
return(0);
}
static void
xen_rtc_identify(driver_t *drv, device_t parent)
{
BUS_ADD_CHILD(parent, 0, "rtc", 0);
}
static device_method_t xen_rtc_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, xen_rtc_probe),
DEVMETHOD(device_attach, xen_rtc_attach),
DEVMETHOD(device_identify, xen_rtc_identify),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
/* clock interface */
DEVMETHOD(clock_gettime, xen_rtc_gettime),
DEVMETHOD(clock_settime, xen_rtc_settime),
{ 0, 0 }
};
static driver_t xen_rtc_driver = {
"rtc",
xen_rtc_methods,
0
};
static devclass_t xen_rtc_devclass;
DRIVER_MODULE(rtc, nexus, xen_rtc_driver, xen_rtc_devclass, 0, 0);
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