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/*
* Copyright (c) 2013 Roger Pau Monné <roger.pau@citrix.com>
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/pcpu.h>
#include <sys/smp.h>
#include <xen/xen-os.h>
/*
* Dummy Xen cpu device
*
* Since there's no ACPI on PVH guests, we need to create a dummy
* CPU device in order to fill the pcpu->pc_device field.
*/
static void
xenpvcpu_identify(driver_t *driver, device_t parent)
{
int i;
/* Only attach to PV guests, HVM guests use the ACPI CPU devices */
if (!xen_pv_domain())
return;
CPU_FOREACH(i) {
if (BUS_ADD_CHILD(parent, 0, "pvcpu", i) == NULL)
panic("Unable to add Xen PV CPU device.");
}
}
static int
xenpvcpu_probe(device_t dev)
{
device_set_desc(dev, "Xen PV CPU");
return (BUS_PROBE_NOWILDCARD);
}
static int
xenpvcpu_attach(device_t dev)
{
struct pcpu *pc;
int cpu;
cpu = device_get_unit(dev);
pc = pcpu_find(cpu);
pc->pc_device = dev;
return (0);
}
static device_method_t xenpvcpu_methods[] = {
DEVMETHOD(device_identify, xenpvcpu_identify),
DEVMETHOD(device_probe, xenpvcpu_probe),
DEVMETHOD(device_attach, xenpvcpu_attach),
DEVMETHOD_END
};
static driver_t xenpvcpu_driver = {
"pvcpu",
xenpvcpu_methods,
0,
};
devclass_t xenpvcpu_devclass;
DRIVER_MODULE(xenpvcpu, xenpv, xenpvcpu_driver, xenpvcpu_devclass, 0, 0);
MODULE_DEPEND(xenpvcpu, xenpv, 1, 1, 1);
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