Current Path : /sys/i386/xen/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/i386/xen/xen_clock_util.c |
/*- * 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: release/9.1.0/sys/i386/xen/xen_clock_util.c 193032 2009-05-29 13:36:06Z adrian $ */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/sys/i386/xen/xen_clock_util.c 193032 2009-05-29 13:36:06Z adrian $"); #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> /* * Read the current hypervisor start time (wall clock) from Xen. */ void xen_fetch_wallclock(struct timespec *ts) { shared_info_t *s = HYPERVISOR_shared_info; uint32_t ts_version; do { ts_version = s->wc_version; rmb(); ts->tv_sec = s->wc_sec; ts->tv_nsec = s->wc_nsec; rmb(); } while ((s->wc_version & 1) | (ts_version ^ s->wc_version)); } /* * Read the current hypervisor system uptime value from Xen. */ void xen_fetch_uptime(struct timespec *ts) { shared_info_t *s = HYPERVISOR_shared_info; struct vcpu_time_info *src; struct shadow_time_info dst; uint32_t pre_version, post_version; src = &s->vcpu_info[smp_processor_id()].time; spinlock_enter(); do { pre_version = dst.version = src->version; rmb(); dst.system_timestamp = src->system_time; rmb(); post_version = src->version; } while ((pre_version & 1) | (pre_version ^ post_version)); spinlock_exit(); ts->tv_sec = dst.system_timestamp / 1000000000; ts->tv_nsec = dst.system_timestamp % 1000000000; }