145 lines
4.1 KiB
C
145 lines
4.1 KiB
C
/*-
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* Copyright (c) 2009 Adrian Chadd
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/clock.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/time.h>
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#include <xen/xen_intr.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/pmap.h>
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#include <xen/hypervisor.h>
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#include <machine/xen/xen-os.h>
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#include <machine/xen/xenfunc.h>
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#include <xen/interface/io/xenbus.h>
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#include <xen/interface/vcpu.h>
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#include <machine/cpu.h>
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#include <machine/xen/xen_clock_util.h>
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#include "clock_if.h"
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static int
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xen_rtc_probe(device_t dev)
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{
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device_set_desc(dev, "Xen Hypervisor Clock");
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printf("[XEN] xen_rtc_probe: probing Hypervisor RTC clock\n");
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if (! HYPERVISOR_shared_info) {
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device_printf(dev, "No hypervisor shared page found; RTC can not start.\n");
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return (EINVAL);
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}
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return (0);
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}
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static int
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xen_rtc_attach(device_t dev)
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{
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printf("[XEN] xen_rtc_attach: attaching Hypervisor RTC clock\n");
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clock_register(dev, 1000000);
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return(0);
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}
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static int
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xen_rtc_settime(device_t dev __unused, struct timespec *ts)
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{
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device_printf(dev, "[XEN] xen_rtc_settime\n");
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/*
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* Don't return EINVAL here; just silently fail if the domain isn't privileged enough
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* to set the TOD.
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*/
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return(0);
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}
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/*
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* The Xen time structures document the hypervisor start time and the
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* uptime-since-hypervisor-start (in nsec.) They need to be combined
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* in order to calculate a TOD clock.
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*/
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static int
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xen_rtc_gettime(device_t dev, struct timespec *ts)
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{
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struct timespec w_ts, u_ts;
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device_printf(dev, "[XEN] xen_rtc_gettime\n");
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xen_fetch_wallclock(&w_ts);
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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);
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xen_fetch_uptime(&u_ts);
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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);
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timespecclear(ts);
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timespecadd(ts, &w_ts);
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timespecadd(ts, &u_ts);
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device_printf(dev, "[XEN] xen_rtc_gettime: TOD %ld sec; %ld nsec\n", (long int) ts->tv_sec, (long int) ts->tv_nsec);
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return(0);
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}
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static void
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xen_rtc_identify(driver_t *drv, device_t parent)
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{
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BUS_ADD_CHILD(parent, 0, "rtc", 0);
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}
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static device_method_t xen_rtc_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, xen_rtc_probe),
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DEVMETHOD(device_attach, xen_rtc_attach),
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DEVMETHOD(device_identify, xen_rtc_identify),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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/* clock interface */
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DEVMETHOD(clock_gettime, xen_rtc_gettime),
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DEVMETHOD(clock_settime, xen_rtc_settime),
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{ 0, 0 }
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};
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static driver_t xen_rtc_driver = {
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"rtc",
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xen_rtc_methods,
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0
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};
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static devclass_t xen_rtc_devclass;
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DRIVER_MODULE(rtc, nexus, xen_rtc_driver, xen_rtc_devclass, 0, 0);
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