hw/i386/xen/xen_pvdevice.c

   1 /* Copyright (c) Citrix Systems Inc.
   2  * All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms,
   5  * with or without modification, are permitted provided
   6  * that the following conditions are met:
   7  *
   8  * *   Redistributions of source code must retain the above
   9  *     copyright notice, this list of conditions and the
  10  *     following disclaimer.
  11  * *   Redistributions in binary form must reproduce the above
  12  *     copyright notice, this list of conditions and the
  13  *     following disclaimer in the documentation and/or other
  14  *     materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  17  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  23  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  26  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include "qemu/osdep.h"
  33 #include "qapi/error.h"
  34 #include "hw/hw.h"
  35 #include "hw/pci/pci.h"
  36 #include "trace.h"
  37
  38 #define TYPE_XEN_PV_DEVICE  "xen-pvdevice"
  39
  40 #define XEN_PV_DEVICE(obj) \
  41      OBJECT_CHECK(XenPVDevice, (obj), TYPE_XEN_PV_DEVICE)
  42
  43 typedef struct XenPVDevice {
  44     /*< private >*/
  45     PCIDevice       parent_obj;
  46     /*< public >*/
  47     uint16_t        vendor_id;
  48     uint16_t        device_id;
  49     uint8_t         revision;
  50     uint32_t        size;
  51     MemoryRegion    mmio;
  52 } XenPVDevice;
  53
  54 static uint64_t xen_pv_mmio_read(void *opaque, hwaddr addr,
  55                                  unsigned size)
  56 {
  57     trace_xen_pv_mmio_read(addr);
  58
  59     return ~(uint64_t)0;
  60 }
  61
  62 static void xen_pv_mmio_write(void *opaque, hwaddr addr,
  63                               uint64_t val, unsigned size)
  64 {
  65     trace_xen_pv_mmio_write(addr);
  66 }
  67
  68 static const MemoryRegionOps xen_pv_mmio_ops = {
  69     .read = &xen_pv_mmio_read,
  70     .write = &xen_pv_mmio_write,
  71     .endianness = DEVICE_LITTLE_ENDIAN,
  72 };
  73
  74 static void xen_pv_realize(PCIDevice *pci_dev, Error **errp)
  75 {
  76     XenPVDevice *d = XEN_PV_DEVICE(pci_dev);
  77     uint8_t *pci_conf;
  78
  79     /* device-id property must always be supplied */
  80     if (d->device_id == 0xffff) {
  81         error_setg(errp, "Device ID invalid, it must always be supplied");
  82         return;
  83     }
  84
  85     pci_conf = pci_dev->config;
  86
  87     pci_set_word(pci_conf + PCI_VENDOR_ID, d->vendor_id);
  88     pci_set_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID, d->vendor_id);
  89     pci_set_word(pci_conf + PCI_DEVICE_ID, d->device_id);
  90     pci_set_word(pci_conf + PCI_SUBSYSTEM_ID, d->device_id);
  91     pci_set_byte(pci_conf + PCI_REVISION_ID, d->revision);
  92
  93     pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_MEMORY);
  94
  95     pci_config_set_prog_interface(pci_conf, 0);
  96
  97     pci_conf[PCI_INTERRUPT_PIN] = 1;
  98
  99     memory_region_init_io(&d->mmio, NULL, &xen_pv_mmio_ops, d,
 100                           "mmio", d->size);
 101
 102     pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_MEM_PREFETCH,
 103                      &d->mmio);
 104 }
 105
 106 static Property xen_pv_props[] = {
 107     DEFINE_PROP_UINT16("vendor-id", XenPVDevice, vendor_id, PCI_VENDOR_ID_XEN),
 108     DEFINE_PROP_UINT16("device-id", XenPVDevice, device_id, 0xffff),
 109     DEFINE_PROP_UINT8("revision", XenPVDevice, revision, 0x01),
 110     DEFINE_PROP_UINT32("size", XenPVDevice, size, 0x400000),
 111     DEFINE_PROP_END_OF_LIST()
 112 };
 113
 114 static void xen_pv_class_init(ObjectClass *klass, void *data)
 115 {
 116     DeviceClass *dc = DEVICE_CLASS(klass);
 117     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 118
 119     k->realize = xen_pv_realize;
 120     k->class_id = PCI_CLASS_SYSTEM_OTHER;
 121     dc->desc = "Xen PV Device";
 122     dc->props = xen_pv_props;
 123 }
 124
 125 static const TypeInfo xen_pv_type_info = {
 126     .name          = TYPE_XEN_PV_DEVICE,
 127     .parent        = TYPE_PCI_DEVICE,
 128     .instance_size = sizeof(XenPVDevice),
 129     .class_init    = xen_pv_class_init,
 130 };
 131
 132 static void xen_pv_register_types(void)
 133 {
 134     type_register_static(&xen_pv_type_info);
 135 }
 136
 137 type_init(xen_pv_register_types)