102 lines
3.1 KiB
C
102 lines
3.1 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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/*
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* Read the current hypervisor start time (wall clock) from Xen.
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*/
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void
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xen_fetch_wallclock(struct timespec *ts)
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{
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shared_info_t *s = HYPERVISOR_shared_info;
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uint32_t ts_version;
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do {
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ts_version = s->wc_version;
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rmb();
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ts->tv_sec = s->wc_sec;
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ts->tv_nsec = s->wc_nsec;
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rmb();
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}
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while ((s->wc_version & 1) | (ts_version ^ s->wc_version));
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}
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/*
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* Read the current hypervisor system uptime value from Xen.
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*/
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void
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xen_fetch_uptime(struct timespec *ts)
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{
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shared_info_t *s = HYPERVISOR_shared_info;
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struct vcpu_time_info *src;
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struct shadow_time_info dst;
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uint32_t pre_version, post_version;
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src = &s->vcpu_info[smp_processor_id()].time;
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spinlock_enter();
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do {
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pre_version = dst.version = src->version;
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rmb();
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dst.system_timestamp = src->system_time;
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rmb();
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post_version = src->version;
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}
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while ((pre_version & 1) | (pre_version ^ post_version));
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spinlock_exit();
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ts->tv_sec = dst.system_timestamp / 1000000000;
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ts->tv_nsec = dst.system_timestamp % 1000000000;
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}
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