81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*-
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* Copyright (c) 2008 Citrix Systems, Inc.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/interrupt.h>
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#include <machine/atomic.h>
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#include <machine/xen/xen-os.h>
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#include <xen/hypervisor.h>
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#include <xen/xen_intr.h>
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#include <dev/xen/xenpci/xenpcivar.h>
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void
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xen_suspend()
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{
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int suspend_cancelled;
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if (DEVICE_SUSPEND(root_bus)) {
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printf("xen_suspend: device_suspend failed\n");
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return;
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}
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/*
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* Make sure we don't change cpus or switch to some other
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* thread. for the duration.
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*/
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critical_enter();
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/*
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* Prevent any races with evtchn_interrupt() handler.
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*/
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irq_suspend();
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disable_intr();
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suspend_cancelled = HYPERVISOR_suspend(0);
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if (!suspend_cancelled)
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xenpci_resume();
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/*
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* Re-enable interrupts and put the scheduler back to normal.
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*/
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enable_intr();
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critical_exit();
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/*
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* FreeBSD really needs to add DEVICE_SUSPEND_CANCEL or
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* similar.
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*/
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if (!suspend_cancelled)
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DEVICE_RESUME(root_bus);
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}
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