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 "hw/hw.h"
  34 #include "hw/pci/pci.h"
  35 #include "trace.h"
  36
  37 #define TYPE_XEN_PV_DEVICE  "xen-pvdevice"
  38
  39 #define XEN_PV_DEVICE(obj) \
  40      OBJECT_CHECK(XenPVDevice, (obj), TYPE_XEN_PV_DEVICE)
  41
  42 typedef struct XenPVDevice {
  43     /*< private >*/
  44     PCIDevice       parent_obj;
  45     /*< public >*/
  46     uint16_t        vendor_id;
  47     uint16_t        device_id;
  48     uint8_t         revision;
  49     uint32_t        size;
  50     MemoryRegion    mmio;
  51 } XenPVDevice;
  52
  53 static uint64_t xen_pv_mmio_read(void *opaque, hwaddr addr,
  54                                  unsigned size)
  55 {
  56     trace_xen_pv_mmio_read(addr);
  57
  58     return ~(uint64_t)0;
  59 }
  60
  61 static void xen_pv_mmio_write(void *opaque, hwaddr addr,
  62                               uint64_t val, unsigned size)
  63 {
  64     trace_xen_pv_mmio_write(addr);
  65 }
  66
  67 static const MemoryRegionOps xen_pv_mmio_ops = {
  68     .read = &xen_pv_mmio_read,
  69     .write = &xen_pv_mmio_write,
  70     .endianness = DEVICE_LITTLE_ENDIAN,
  71 };
  72
  73 static void xen_pv_realize(PCIDevice *pci_dev, Error **errp)
  74 {
  75     XenPVDevice *d = XEN_PV_DEVICE(pci_dev);
  76     uint8_t *pci_conf;
  77
  78     /* device-id property must always be supplied */
  79     if (d->device_id == 0xffff) {
  80         error_setg(errp, "Device ID invalid, it must always be supplied");
  81         return;
  82     }
  83
  84     pci_conf = pci_dev->config;
  85
  86     pci_set_word(pci_conf + PCI_VENDOR_ID, d->vendor_id);
  87     pci_set_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID, d->vendor_id);
  88     pci_set_word(pci_conf + PCI_DEVICE_ID, d->device_id);
  89     pci_set_word(pci_conf + PCI_SUBSYSTEM_ID, d->device_id);
  90     pci_set_byte(pci_conf + PCI_REVISION_ID, d->revision);
  91
  92     pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_MEMORY);
  93
  94     pci_config_set_prog_interface(pci_conf, 0);
  95
  96     pci_conf[PCI_INTERRUPT_PIN] = 1;
  97
  98     memory_region_init_io(&d->mmio, NULL, &xen_pv_mmio_ops, d,
  99                           "mmio", d->size);
 100
 101     pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_MEM_PREFETCH,
 102                      &d->mmio);
 103 }
 104
 105 static Property xen_pv_props[] = {
 106     DEFINE_PROP_UINT16("vendor-id", XenPVDevice, vendor_id, PCI_VENDOR_ID_XEN),
 107     DEFINE_PROP_UINT16("device-id", XenPVDevice, device_id, 0xffff),
 108     DEFINE_PROP_UINT8("revision", XenPVDevice, revision, 0x01),
 109     DEFINE_PROP_UINT32("size", XenPVDevice, size, 0x400000),
 110     DEFINE_PROP_END_OF_LIST()
 111 };
 112
 113 static void xen_pv_class_init(ObjectClass *klass, void *data)
 114 {
 115     DeviceClass *dc = DEVICE_CLASS(klass);
 116     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 117
 118     k->realize = xen_pv_realize;
 119     k->class_id = PCI_CLASS_SYSTEM_OTHER;
 120     dc->desc = "Xen PV Device";
 121     dc->props = xen_pv_props;
 122 }
 123
 124 static const TypeInfo xen_pv_type_info = {
 125     .name          = TYPE_XEN_PV_DEVICE,
 126     .parent        = TYPE_PCI_DEVICE,
 127     .instance_size = sizeof(XenPVDevice),
 128     .class_init    = xen_pv_class_init,
 129 };
 130
 131 static void xen_pv_register_types(void)
 132 {
 133     type_register_static(&xen_pv_type_info);
 134 }
 135
 136 type_init(xen_pv_register_types)