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>
41 #include <vm/vm_page.h>
42 #include <vm/vm_param.h>
43 #include <vm/vm_phys.h>
45 #include <xen/xen-os.h>
46 #include <xen/gnttab.h>
48 #include "xenmem_if.h"
51 * Allocate unused physical memory above 4GB in order to map memory
52 * from foreign domains. We use memory starting at 4GB in order to
53 * prevent clashes with MMIO/ACPI regions.
55 * Since this is not possible on i386 just use any available memory
56 * chunk and hope we don't clash with anything else.
59 #define LOW_MEM_LIMIT 0x100000000ul
61 #define LOW_MEM_LIMIT 0
64 static devclass_t xenpv_devclass;
67 xenpv_identify(driver_t *driver, device_t parent)
72 /* Make sure there's only one xenpv device. */
73 if (devclass_get_device(xenpv_devclass, 0))
77 * The xenpv bus should be the last to attach in order
78 * to properly detect if an ISA bus has already been added.
80 if (BUS_ADD_CHILD(parent, UINT_MAX, "xenpv", 0) == NULL)
81 panic("Unable to attach xenpv bus.");
85 xenpv_probe(device_t dev)
88 device_set_desc(dev, "Xen PV bus");
89 return (BUS_PROBE_NOWILDCARD);
93 xenpv_attach(device_t dev)
98 * Let our child drivers identify any child devices that they
99 * can find. Once that is done attach any devices that we
102 bus_generic_probe(dev);
103 bus_generic_attach(dev);
105 if (!devclass_get_device(devclass_find("isa"), 0)) {
106 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
108 panic("Failed to attach ISA bus.");
109 device_probe_and_attach(child);
115 static struct resource *
116 xenpv_alloc_physmem(device_t dev, device_t child, int *res_id, size_t size)
118 struct resource *res;
119 vm_paddr_t phys_addr;
122 res = bus_alloc_resource(child, SYS_RES_MEMORY, res_id, LOW_MEM_LIMIT,
123 ~0, size, RF_ACTIVE);
127 phys_addr = rman_get_start(res);
128 error = vm_phys_fictitious_reg_range(phys_addr, phys_addr + size,
131 bus_release_resource(child, SYS_RES_MEMORY, *res_id, res);
139 xenpv_free_physmem(device_t dev, device_t child, int res_id, struct resource *res)
141 vm_paddr_t phys_addr;
144 phys_addr = rman_get_start(res);
145 size = rman_get_size(res);
147 vm_phys_fictitious_unreg_range(phys_addr, phys_addr + size);
148 return (bus_release_resource(child, SYS_RES_MEMORY, res_id, res));
151 static device_method_t xenpv_methods[] = {
152 /* Device interface */
153 DEVMETHOD(device_identify, xenpv_identify),
154 DEVMETHOD(device_probe, xenpv_probe),
155 DEVMETHOD(device_attach, xenpv_attach),
156 DEVMETHOD(device_suspend, bus_generic_suspend),
157 DEVMETHOD(device_resume, bus_generic_resume),
160 DEVMETHOD(bus_add_child, bus_generic_add_child),
161 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
162 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
163 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
164 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
166 /* Interface to allocate memory for foreign mappings */
167 DEVMETHOD(xenmem_alloc, xenpv_alloc_physmem),
168 DEVMETHOD(xenmem_free, xenpv_free_physmem),
173 static driver_t xenpv_driver = {
179 DRIVER_MODULE(xenpv, nexus, xenpv_driver, xenpv_devclass, 0, 0);
182 xenmem_alloc(device_t dev, int *res_id, size_t size)
186 parent = device_get_parent(dev);
189 return (XENMEM_ALLOC(parent, dev, res_id, size));
193 xenmem_free(device_t dev, int res_id, struct resource *res)
197 parent = device_get_parent(dev);
200 return (XENMEM_FREE(parent, dev, res_id, res));