The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/x86/xen/xenpv.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*
    2  * Copyright (c) 2014 Roger Pau Monné <roger.pau@citrix.com>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    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.
   13  *
   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
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/module.h>
   35 #include <sys/pcpu.h>
   36 #include <sys/rman.h>
   37 #include <sys/smp.h>
   38 #include <sys/limits.h>
   39 #include <sys/vmmeter.h>
   40 
   41 #include <vm/vm.h>
   42 #include <vm/vm_page.h>
   43 #include <vm/vm_param.h>
   44 #include <vm/vm_phys.h>
   45 
   46 #include <xen/xen-os.h>
   47 #include <xen/gnttab.h>
   48 
   49 #include "xenmem_if.h"
   50 
   51 /*
   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.
   55  *
   56  * Since this is not possible on i386 just use any available memory
   57  * chunk above 1MB and hope we don't clash with anything else.
   58  */
   59 #ifdef __amd64__
   60 #define LOW_MEM_LIMIT   0x100000000ul
   61 #elif defined(__i386__)
   62 #define LOW_MEM_LIMIT   0x100000ul
   63 #else
   64 #error "Unsupported architecture"
   65 #endif
   66 
   67 static devclass_t xenpv_devclass;
   68 
   69 static void
   70 xenpv_identify(driver_t *driver, device_t parent)
   71 {
   72         if (!xen_domain())
   73                 return;
   74 
   75         /* Make sure there's only one xenpv device. */
   76         if (devclass_get_device(xenpv_devclass, 0))
   77                 return;
   78 
   79         /*
   80          * The xenpv bus should be the last to attach in order
   81          * to properly detect if an ISA bus has already been added.
   82          */
   83         if (BUS_ADD_CHILD(parent, UINT_MAX, "xenpv", 0) == NULL)
   84                 panic("Unable to attach xenpv bus.");
   85 }
   86 
   87 static int
   88 xenpv_probe(device_t dev)
   89 {
   90 
   91         device_set_desc(dev, "Xen PV bus");
   92         return (BUS_PROBE_NOWILDCARD);
   93 }
   94 
   95 static int
   96 xenpv_attach(device_t dev)
   97 {
   98         device_t child;
   99 
  100         /*
  101          * Let our child drivers identify any child devices that they
  102          * can find.  Once that is done attach any devices that we
  103          * found.
  104          */
  105         bus_generic_probe(dev);
  106         bus_generic_attach(dev);
  107 
  108         if (!devclass_get_device(devclass_find("isa"), 0)) {
  109                 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
  110                 if (child == NULL)
  111                         panic("Failed to attach ISA bus.");
  112                 device_probe_and_attach(child);
  113         }
  114 
  115         return (0);
  116 }
  117 
  118 static struct resource *
  119 xenpv_alloc_physmem(device_t dev, device_t child, int *res_id, size_t size)
  120 {
  121         struct resource *res;
  122         vm_paddr_t phys_addr;
  123         int error;
  124 
  125         res = bus_alloc_resource(child, SYS_RES_MEMORY, res_id, LOW_MEM_LIMIT,
  126             ~0, size, RF_ACTIVE);
  127         if (res == NULL)
  128                 return (NULL);
  129 
  130         phys_addr = rman_get_start(res);
  131         error = vm_phys_fictitious_reg_range(phys_addr, phys_addr + size,
  132             VM_MEMATTR_DEFAULT);
  133         if (error) {
  134                 bus_release_resource(child, SYS_RES_MEMORY, *res_id, res);
  135                 return (NULL);
  136         }
  137 
  138         return (res);
  139 }
  140 
  141 static int
  142 xenpv_free_physmem(device_t dev, device_t child, int res_id, struct resource *res)
  143 {
  144         vm_paddr_t phys_addr;
  145         size_t size;
  146 
  147         phys_addr = rman_get_start(res);
  148         size = rman_get_size(res);
  149 
  150         vm_phys_fictitious_unreg_range(phys_addr, phys_addr + size);
  151         return (bus_release_resource(child, SYS_RES_MEMORY, res_id, res));
  152 }
  153 
  154 static device_method_t xenpv_methods[] = {
  155         /* Device interface */
  156         DEVMETHOD(device_identify,              xenpv_identify),
  157         DEVMETHOD(device_probe,                 xenpv_probe),
  158         DEVMETHOD(device_attach,                xenpv_attach),
  159         DEVMETHOD(device_suspend,               bus_generic_suspend),
  160         DEVMETHOD(device_resume,                bus_generic_resume),
  161 
  162         /* Bus interface */
  163         DEVMETHOD(bus_add_child,                bus_generic_add_child),
  164         DEVMETHOD(bus_alloc_resource,           bus_generic_alloc_resource),
  165         DEVMETHOD(bus_release_resource,         bus_generic_release_resource),
  166         DEVMETHOD(bus_activate_resource,        bus_generic_activate_resource),
  167         DEVMETHOD(bus_deactivate_resource,      bus_generic_deactivate_resource),
  168 
  169         /* Interface to allocate memory for foreign mappings */
  170         DEVMETHOD(xenmem_alloc,                 xenpv_alloc_physmem),
  171         DEVMETHOD(xenmem_free,                  xenpv_free_physmem),
  172 
  173         DEVMETHOD_END
  174 };
  175 
  176 static driver_t xenpv_driver = {
  177         "xenpv",
  178         xenpv_methods,
  179         0,
  180 };
  181 
  182 DRIVER_MODULE(xenpv, nexus, xenpv_driver, xenpv_devclass, 0, 0);
  183 
  184 struct resource *
  185 xenmem_alloc(device_t dev, int *res_id, size_t size)
  186 {
  187         device_t parent;
  188 
  189         parent = device_get_parent(dev);
  190         if (parent == NULL)
  191                 return (NULL);
  192         return (XENMEM_ALLOC(parent, dev, res_id, size));
  193 }
  194 
  195 int
  196 xenmem_free(device_t dev, int res_id, struct resource *res)
  197 {
  198         device_t parent;
  199 
  200         parent = device_get_parent(dev);
  201         if (parent == NULL)
  202                 return (ENXIO);
  203         return (XENMEM_FREE(parent, dev, res_id, res));
  204 }

Cache object: 421e171cdd621a95909c82fbe79f4c64


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.