hw/i386/xen/xen_pvdevice.c

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