2 * Copyright (c) 2014 Roger Pau Monné <roger.pau@citrix.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
31 #include <sys/cdefs.h>
32 #include <sys/errno.h>
34 #include <sys/param.h>
35 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
40 #include <sys/module.h>
42 #include <xen/xen-os.h>
44 #include <xen/hypervisor.h>
45 #include <xen/xenstore/xenstorevar.h>
50 #define XSD_READ_SIZE 20
52 static int xsd_dev_read(struct cdev *dev, struct uio *uio, int ioflag);
53 static int xsd_dev_mmap(struct cdev *dev, vm_ooffset_t offset,
54 vm_paddr_t *paddr, int nprot, vm_memattr_t *memattr);
57 static struct cdevsw xsd_dev_cdevsw = {
58 .d_version = D_VERSION,
59 .d_read = xsd_dev_read,
60 .d_mmap = xsd_dev_mmap,
65 xsd_dev_read(struct cdev *dev, struct uio *uio, int ioflag)
67 char evtchn[XSD_READ_SIZE];
70 len = snprintf(evtchn, sizeof(evtchn), "%u", xs_evtchn());
71 if (len < 0 || len > uio->uio_resid)
74 error = uiomove(evtchn, len, uio);
82 xsd_dev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
83 int nprot, vm_memattr_t *memattr)
89 *paddr = xs_address();
94 /*------------------ Private Device Attachment Functions --------------------*/
96 * \brief Identify instances of this device type in the system.
98 * \param driver The driver performing this identify action.
99 * \param parent The NewBus parent device for any devices this method adds.
102 xsd_dev_identify(driver_t *driver __unused, device_t parent)
105 if (!xen_domain() || xs_initialized())
109 * Only attach if xenstore is not available, because we are the
110 * domain that's supposed to run it.
112 BUS_ADD_CHILD(parent, 0, driver->name, 0);
116 * \brief Probe for the existence of the Xenstored device
118 * \param dev NewBus device_t for this instance.
120 * \return Always returns 0 indicating success.
123 xsd_dev_probe(device_t dev)
126 device_set_desc(dev, "Xenstored user-space device");
127 return (BUS_PROBE_NOWILDCARD);
131 * \brief Attach the Xenstored device.
133 * \param dev NewBus device_t for this instance.
135 * \return On success, 0. Otherwise an errno value indicating the
139 xsd_dev_attach(device_t dev)
141 struct cdev *xsd_cdev;
143 xsd_cdev = make_dev(&xsd_dev_cdevsw, 0, UID_ROOT, GID_WHEEL, 0400,
145 if (xsd_cdev == NULL)
151 /*-------------------- Private Device Attachment Data -----------------------*/
152 static device_method_t xsd_dev_methods[] = {
153 /* Device interface */
154 DEVMETHOD(device_identify, xsd_dev_identify),
155 DEVMETHOD(device_probe, xsd_dev_probe),
156 DEVMETHOD(device_attach, xsd_dev_attach),
161 DEFINE_CLASS_0(xsd_dev, xsd_dev_driver, xsd_dev_methods, 0);
162 devclass_t xsd_dev_devclass;
164 DRIVER_MODULE(xsd_dev, xenpv, xsd_dev_driver, xsd_dev_devclass,