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/param.h>
31 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
38 #include <sys/limits.h>
39 #include <sys/vmmeter.h>
42 #include <vm/vm_page.h>
43 #include <vm/vm_param.h>
44 #include <vm/vm_phys.h>
46 #include <xen/xen-os.h>
47 #include <xen/gnttab.h>
49 #include "xenmem_if.h"
52 * Allocate unused physical memory above 4GB in order to map memory
53 * from foreign domains. We use memory starting at 4GB in order to
54 * prevent clashes with MMIO/ACPI regions.
56 * Since this is not possible on i386 just use any available memory
57 * chunk and hope we don't clash with anything else.
60 #define LOW_MEM_LIMIT 0x100000000ul
62 #define LOW_MEM_LIMIT 0
65 static devclass_t xenpv_devclass;
68 xenpv_identify(driver_t *driver, device_t parent)
73 /* Make sure there's only one xenpv device. */
74 if (devclass_get_device(xenpv_devclass, 0))
78 * The xenpv bus should be the last to attach in order
79 * to properly detect if an ISA bus has already been added.
81 if (BUS_ADD_CHILD(parent, UINT_MAX, "xenpv", 0) == NULL)
82 panic("Unable to attach xenpv bus.");
86 xenpv_probe(device_t dev)
89 device_set_desc(dev, "Xen PV bus");
90 return (BUS_PROBE_NOWILDCARD);
94 xenpv_attach(device_t dev)
99 * Let our child drivers identify any child devices that they
100 * can find. Once that is done attach any devices that we
103 error = bus_generic_probe(dev);
107 error = bus_generic_attach(dev);
112 static struct resource *
113 xenpv_alloc_physmem(device_t dev, device_t child, int *res_id, size_t size)
115 struct resource *res;
116 vm_paddr_t phys_addr;
119 res = bus_alloc_resource(child, SYS_RES_MEMORY, res_id, LOW_MEM_LIMIT,
120 ~0, size, RF_ACTIVE);
124 phys_addr = rman_get_start(res);
125 error = vm_phys_fictitious_reg_range(phys_addr, phys_addr + size,
128 bus_release_resource(child, SYS_RES_MEMORY, *res_id, res);
136 xenpv_free_physmem(device_t dev, device_t child, int res_id, struct resource *res)
138 vm_paddr_t phys_addr;
141 phys_addr = rman_get_start(res);
142 size = rman_get_size(res);
144 vm_phys_fictitious_unreg_range(phys_addr, phys_addr + size);
145 return (bus_release_resource(child, SYS_RES_MEMORY, res_id, res));
148 static device_method_t xenpv_methods[] = {
149 /* Device interface */
150 DEVMETHOD(device_identify, xenpv_identify),
151 DEVMETHOD(device_probe, xenpv_probe),
152 DEVMETHOD(device_attach, xenpv_attach),
153 DEVMETHOD(device_suspend, bus_generic_suspend),
154 DEVMETHOD(device_resume, bus_generic_resume),
157 DEVMETHOD(bus_add_child, bus_generic_add_child),
158 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
159 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
160 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
161 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
163 /* Interface to allocate memory for foreign mappings */
164 DEVMETHOD(xenmem_alloc, xenpv_alloc_physmem),
165 DEVMETHOD(xenmem_free, xenpv_free_physmem),
170 static driver_t xenpv_driver = {
176 DRIVER_MODULE(xenpv, nexus, xenpv_driver, xenpv_devclass, 0, 0);
179 xenmem_alloc(device_t dev, int *res_id, size_t size)
183 parent = device_get_parent(dev);
186 return (XENMEM_ALLOC(parent, dev, res_id, size));
190 xenmem_free(device_t dev, int res_id, struct resource *res)
194 parent = device_get_parent(dev);
197 return (XENMEM_FREE(parent, dev, res_id, res));