hw/pci-host/q35.c

   1 /*
   2  * QEMU MCH/ICH9 PCI Bridge Emulation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  * Copyright (c) 2009, 2010, 2011
   6  *               Isaku Yamahata <yamahata at valinux co jp>
   7  *               VA Linux Systems Japan K.K.
   8  * Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
   9  *
  10  * This is based on piix.c, but heavily modified.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a copy
  13  * of this software and associated documentation files (the "Software"), to deal
  14  * in the Software without restriction, including without limitation the rights
  15  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  16  * copies of the Software, and to permit persons to whom the Software is
  17  * furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included in
  20  * all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  25  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  27  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  28  * THE SOFTWARE.
  29  */
  30 #include "qemu/osdep.h"
  31 #include "hw/hw.h"
  32 #include "hw/pci-host/q35.h"
  33 #include "qapi/error.h"
  34 #include "qapi/visitor.h"
  35
  36 /****************************************************************************
  37  * Q35 host
  38  */
  39
  40 static void q35_host_realize(DeviceState *dev, Error **errp)
  41 {
  42     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
  43     Q35PCIHost *s = Q35_HOST_DEVICE(dev);
  44     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
  45
  46     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, &pci->conf_mem);
  47     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, 4);
  48
  49     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, &pci->data_mem);
  50     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, 4);
  51
  52     pci->bus = pci_bus_new(DEVICE(s), "pcie.0",
  53                            s->mch.pci_address_space, s->mch.address_space_io,
  54                            0, TYPE_PCIE_BUS);
  55     PC_MACHINE(qdev_get_machine())->bus = pci->bus;
  56     qdev_set_parent_bus(DEVICE(&s->mch), BUS(pci->bus));
  57     qdev_init_nofail(DEVICE(&s->mch));
  58 }
  59
  60 static const char *q35_host_root_bus_path(PCIHostState *host_bridge,
  61                                           PCIBus *rootbus)
  62 {
  63     Q35PCIHost *s = Q35_HOST_DEVICE(host_bridge);
  64
  65      /* For backwards compat with old device paths */
  66     if (s->mch.short_root_bus) {
  67         return "0000";
  68     }
  69     return "0000:00";
  70 }
  71
  72 static void q35_host_get_pci_hole_start(Object *obj, Visitor *v,
  73                                         const char *name, void *opaque,
  74                                         Error **errp)
  75 {
  76     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
  77     uint64_t val64;
  78     uint32_t value;
  79
  80     val64 = range_is_empty(&s->mch.pci_hole)
  81         ? 0 : range_lob(&s->mch.pci_hole);
  82     value = val64;
  83     assert(value == val64);
  84     visit_type_uint32(v, name, &value, errp);
  85 }
  86
  87 static void q35_host_get_pci_hole_end(Object *obj, Visitor *v,
  88                                       const char *name, void *opaque,
  89                                       Error **errp)
  90 {
  91     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
  92     uint64_t val64;
  93     uint32_t value;
  94
  95     val64 = range_is_empty(&s->mch.pci_hole)
  96         ? 0 : range_upb(&s->mch.pci_hole) + 1;
  97     value = val64;
  98     assert(value == val64);
  99     visit_type_uint32(v, name, &value, errp);
 100 }
 101
 102 static void q35_host_get_pci_hole64_start(Object *obj, Visitor *v,
 103                                           const char *name, void *opaque,
 104                                           Error **errp)
 105 {
 106     PCIHostState *h = PCI_HOST_BRIDGE(obj);
 107     Range w64;
 108     uint64_t value;
 109
 110     pci_bus_get_w64_range(h->bus, &w64);
 111     value = range_is_empty(&w64) ? 0 : range_lob(&w64);
 112     visit_type_uint64(v, name, &value, errp);
 113 }
 114
 115 static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
 116                                         const char *name, void *opaque,
 117                                         Error **errp)
 118 {
 119     PCIHostState *h = PCI_HOST_BRIDGE(obj);
 120     Range w64;
 121     uint64_t value;
 122
 123     pci_bus_get_w64_range(h->bus, &w64);
 124     value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1;
 125     visit_type_uint64(v, name, &value, errp);
 126 }
 127
 128 static void q35_host_get_mmcfg_size(Object *obj, Visitor *v, const char *name,
 129                                     void *opaque, Error **errp)
 130 {
 131     PCIExpressHost *e = PCIE_HOST_BRIDGE(obj);
 132     uint32_t value = e->size;
 133
 134     visit_type_uint32(v, name, &value, errp);
 135 }
 136
 137 static Property mch_props[] = {
 138     DEFINE_PROP_UINT64(PCIE_HOST_MCFG_BASE, Q35PCIHost, parent_obj.base_addr,
 139                         MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT),
 140     DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, Q35PCIHost,
 141                      mch.pci_hole64_size, DEFAULT_PCI_HOLE64_SIZE),
 142     DEFINE_PROP_UINT32("short_root_bus", Q35PCIHost, mch.short_root_bus, 0),
 143     DEFINE_PROP_SIZE(PCI_HOST_BELOW_4G_MEM_SIZE, Q35PCIHost,
 144                      mch.below_4g_mem_size, 0),
 145     DEFINE_PROP_SIZE(PCI_HOST_ABOVE_4G_MEM_SIZE, Q35PCIHost,
 146                      mch.above_4g_mem_size, 0),
 147     DEFINE_PROP_END_OF_LIST(),
 148 };
 149
 150 static void q35_host_class_init(ObjectClass *klass, void *data)
 151 {
 152     DeviceClass *dc = DEVICE_CLASS(klass);
 153     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
 154
 155     hc->root_bus_path = q35_host_root_bus_path;
 156     dc->realize = q35_host_realize;
 157     dc->props = mch_props;
 158     /* Reason: needs to be wired up by pc_q35_init */
 159     dc->cannot_instantiate_with_device_add_yet = true;
 160     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 161     dc->fw_name = "pci";
 162 }
 163
 164 static void q35_host_initfn(Object *obj)
 165 {
 166     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
 167     PCIHostState *phb = PCI_HOST_BRIDGE(obj);
 168
 169     memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb,
 170                           "pci-conf-idx", 4);
 171     memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb,
 172                           "pci-conf-data", 4);
 173
 174     object_initialize(&s->mch, sizeof(s->mch), TYPE_MCH_PCI_DEVICE);
 175     object_property_add_child(OBJECT(s), "mch", OBJECT(&s->mch), NULL);
 176     qdev_prop_set_uint32(DEVICE(&s->mch), "addr", PCI_DEVFN(0, 0));
 177     qdev_prop_set_bit(DEVICE(&s->mch), "multifunction", false);
 178
 179     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "int",
 180                         q35_host_get_pci_hole_start,
 181                         NULL, NULL, NULL, NULL);
 182
 183     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "int",
 184                         q35_host_get_pci_hole_end,
 185                         NULL, NULL, NULL, NULL);
 186
 187     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "int",
 188                         q35_host_get_pci_hole64_start,
 189                         NULL, NULL, NULL, NULL);
 190
 191     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "int",
 192                         q35_host_get_pci_hole64_end,
 193                         NULL, NULL, NULL, NULL);
 194
 195     object_property_add(obj, PCIE_HOST_MCFG_SIZE, "int",
 196                         q35_host_get_mmcfg_size,
 197                         NULL, NULL, NULL, NULL);
 198
 199     object_property_add_link(obj, MCH_HOST_PROP_RAM_MEM, TYPE_MEMORY_REGION,
 200                              (Object **) &s->mch.ram_memory,
 201                              qdev_prop_allow_set_link_before_realize, 0, NULL);
 202
 203     object_property_add_link(obj, MCH_HOST_PROP_PCI_MEM, TYPE_MEMORY_REGION,
 204                              (Object **) &s->mch.pci_address_space,
 205                              qdev_prop_allow_set_link_before_realize, 0, NULL);
 206
 207     object_property_add_link(obj, MCH_HOST_PROP_SYSTEM_MEM, TYPE_MEMORY_REGION,
 208                              (Object **) &s->mch.system_memory,
 209                              qdev_prop_allow_set_link_before_realize, 0, NULL);
 210
 211     object_property_add_link(obj, MCH_HOST_PROP_IO_MEM, TYPE_MEMORY_REGION,
 212                              (Object **) &s->mch.address_space_io,
 213                              qdev_prop_allow_set_link_before_realize, 0, NULL);
 214
 215     /* Leave enough space for the biggest MCFG BAR */
 216     /* TODO: this matches current bios behaviour, but
 217      * it's not a power of two, which means an MTRR
 218      * can't cover it exactly.
 219      */
 220     range_set_bounds(&s->mch.pci_hole,
 221             MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT + MCH_HOST_BRIDGE_PCIEXBAR_MAX,
 222             IO_APIC_DEFAULT_ADDRESS - 1);
 223 }
 224
 225 static const TypeInfo q35_host_info = {
 226     .name       = TYPE_Q35_HOST_DEVICE,
 227     .parent     = TYPE_PCIE_HOST_BRIDGE,
 228     .instance_size = sizeof(Q35PCIHost),
 229     .instance_init = q35_host_initfn,
 230     .class_init = q35_host_class_init,
 231 };
 232
 233 /****************************************************************************
 234  * MCH D0:F0
 235  */
 236
 237 static uint64_t tseg_blackhole_read(void *ptr, hwaddr reg, unsigned size)
 238 {
 239     return 0xffffffff;
 240 }
 241
 242 static void tseg_blackhole_write(void *opaque, hwaddr addr, uint64_t val,
 243                                  unsigned width)
 244 {
 245     /* nothing */
 246 }
 247
 248 static const MemoryRegionOps tseg_blackhole_ops = {
 249     .read = tseg_blackhole_read,
 250     .write = tseg_blackhole_write,
 251     .endianness = DEVICE_NATIVE_ENDIAN,
 252     .valid.min_access_size = 1,
 253     .valid.max_access_size = 4,
 254     .impl.min_access_size = 4,
 255     .impl.max_access_size = 4,
 256     .endianness = DEVICE_LITTLE_ENDIAN,
 257 };
 258
 259 /* PCIe MMCFG */
 260 static void mch_update_pciexbar(MCHPCIState *mch)
 261 {
 262     PCIDevice *pci_dev = PCI_DEVICE(mch);
 263     BusState *bus = qdev_get_parent_bus(DEVICE(mch));
 264     PCIExpressHost *pehb = PCIE_HOST_BRIDGE(bus->parent);
 265
 266     uint64_t pciexbar;
 267     int enable;
 268     uint64_t addr;
 269     uint64_t addr_mask;
 270     uint32_t length;
 271
 272     pciexbar = pci_get_quad(pci_dev->config + MCH_HOST_BRIDGE_PCIEXBAR);
 273     enable = pciexbar & MCH_HOST_BRIDGE_PCIEXBAREN;
 274     addr_mask = MCH_HOST_BRIDGE_PCIEXBAR_ADMSK;
 275     switch (pciexbar & MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_MASK) {
 276     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_256M:
 277         length = 256 * 1024 * 1024;
 278         break;
 279     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_128M:
 280         length = 128 * 1024 * 1024;
 281         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_128ADMSK |
 282             MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
 283         break;
 284     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_64M:
 285         length = 64 * 1024 * 1024;
 286         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
 287         break;
 288     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_RVD:
 289     default:
 290         abort();
 291     }
 292     addr = pciexbar & addr_mask;
 293     pcie_host_mmcfg_update(pehb, enable, addr, length);
 294     /* Leave enough space for the MCFG BAR */
 295     /*
 296      * TODO: this matches current bios behaviour, but it's not a power of two,
 297      * which means an MTRR can't cover it exactly.
 298      */
 299     if (enable) {
 300         range_set_bounds(&mch->pci_hole,
 301                          addr + length,
 302                          IO_APIC_DEFAULT_ADDRESS - 1);
 303     } else {
 304         range_set_bounds(&mch->pci_hole,
 305                          MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT,
 306                          IO_APIC_DEFAULT_ADDRESS - 1);
 307     }
 308 }
 309
 310 /* PAM */
 311 static void mch_update_pam(MCHPCIState *mch)
 312 {
 313     PCIDevice *pd = PCI_DEVICE(mch);
 314     int i;
 315
 316     memory_region_transaction_begin();
 317     for (i = 0; i < 13; i++) {
 318         pam_update(&mch->pam_regions[i], i,
 319                    pd->config[MCH_HOST_BRIDGE_PAM0 + ((i + 1) / 2)]);
 320     }
 321     memory_region_transaction_commit();
 322 }
 323
 324 /* SMRAM */
 325 static void mch_update_smram(MCHPCIState *mch)
 326 {
 327     PCIDevice *pd = PCI_DEVICE(mch);
 328     bool h_smrame = (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_H_SMRAME);
 329     uint32_t tseg_size;
 330
 331     /* implement SMRAM.D_LCK */
 332     if (pd->config[MCH_HOST_BRIDGE_SMRAM] & MCH_HOST_BRIDGE_SMRAM_D_LCK) {
 333         pd->config[MCH_HOST_BRIDGE_SMRAM] &= ~MCH_HOST_BRIDGE_SMRAM_D_OPEN;
 334         pd->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK_LCK;
 335         pd->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK_LCK;
 336     }
 337
 338     memory_region_transaction_begin();
 339
 340     if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_D_OPEN) {
 341         /* Hide (!) low SMRAM if H_SMRAME = 1 */
 342         memory_region_set_enabled(&mch->smram_region, h_smrame);
 343         /* Show high SMRAM if H_SMRAME = 1 */
 344         memory_region_set_enabled(&mch->open_high_smram, h_smrame);
 345     } else {
 346         /* Hide high SMRAM and low SMRAM */
 347         memory_region_set_enabled(&mch->smram_region, true);
 348         memory_region_set_enabled(&mch->open_high_smram, false);
 349     }
 350
 351     if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_G_SMRAME) {
 352         memory_region_set_enabled(&mch->low_smram, !h_smrame);
 353         memory_region_set_enabled(&mch->high_smram, h_smrame);
 354     } else {
 355         memory_region_set_enabled(&mch->low_smram, false);
 356         memory_region_set_enabled(&mch->high_smram, false);
 357     }
 358
 359     if (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_T_EN) {
 360         switch (pd->config[MCH_HOST_BRIDGE_ESMRAMC] &
 361                 MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK) {
 362         case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_1MB:
 363             tseg_size = 1024 * 1024;
 364             break;
 365         case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_2MB:
 366             tseg_size = 1024 * 1024 * 2;
 367             break;
 368         case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_8MB:
 369             tseg_size = 1024 * 1024 * 8;
 370             break;
 371         default:
 372             tseg_size = 0;
 373             break;
 374         }
 375     } else {
 376         tseg_size = 0;
 377     }
 378     memory_region_del_subregion(mch->system_memory, &mch->tseg_blackhole);
 379     memory_region_set_enabled(&mch->tseg_blackhole, tseg_size);
 380     memory_region_set_size(&mch->tseg_blackhole, tseg_size);
 381     memory_region_add_subregion_overlap(mch->system_memory,
 382                                         mch->below_4g_mem_size - tseg_size,
 383                                         &mch->tseg_blackhole, 1);
 384
 385     memory_region_set_enabled(&mch->tseg_window, tseg_size);
 386     memory_region_set_size(&mch->tseg_window, tseg_size);
 387     memory_region_set_address(&mch->tseg_window,
 388                               mch->below_4g_mem_size - tseg_size);
 389     memory_region_set_alias_offset(&mch->tseg_window,
 390                                    mch->below_4g_mem_size - tseg_size);
 391
 392     memory_region_transaction_commit();
 393 }
 394
 395 static void mch_write_config(PCIDevice *d,
 396                               uint32_t address, uint32_t val, int len)
 397 {
 398     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 399
 400     pci_default_write_config(d, address, val, len);
 401
 402     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PAM0,
 403                        MCH_HOST_BRIDGE_PAM_SIZE)) {
 404         mch_update_pam(mch);
 405     }
 406
 407     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PCIEXBAR,
 408                        MCH_HOST_BRIDGE_PCIEXBAR_SIZE)) {
 409         mch_update_pciexbar(mch);
 410     }
 411
 412     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,
 413                        MCH_HOST_BRIDGE_SMRAM_SIZE)) {
 414         mch_update_smram(mch);
 415     }
 416 }
 417
 418 static void mch_update(MCHPCIState *mch)
 419 {
 420     mch_update_pciexbar(mch);
 421     mch_update_pam(mch);
 422     mch_update_smram(mch);
 423 }
 424
 425 static int mch_post_load(void *opaque, int version_id)
 426 {
 427     MCHPCIState *mch = opaque;
 428     mch_update(mch);
 429     return 0;
 430 }
 431
 432 static const VMStateDescription vmstate_mch = {
 433     .name = "mch",
 434     .version_id = 1,
 435     .minimum_version_id = 1,
 436     .post_load = mch_post_load,
 437     .fields = (VMStateField[]) {
 438         VMSTATE_PCI_DEVICE(parent_obj, MCHPCIState),
 439         /* Used to be smm_enabled, which was basically always zero because
 440          * SeaBIOS hardly uses SMM.  SMRAM is now handled by CPU code.
 441          */
 442         VMSTATE_UNUSED(1),
 443         VMSTATE_END_OF_LIST()
 444     }
 445 };
 446
 447 static void mch_reset(DeviceState *qdev)
 448 {
 449     PCIDevice *d = PCI_DEVICE(qdev);
 450     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 451
 452     pci_set_quad(d->config + MCH_HOST_BRIDGE_PCIEXBAR,
 453                  MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
 454
 455     d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;
 456     d->config[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_DEFAULT;
 457     d->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK;
 458     d->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK;
 459
 460     mch_update(mch);
 461 }
 462
 463 static void mch_realize(PCIDevice *d, Error **errp)
 464 {
 465     int i;
 466     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 467
 468     /* setup pci memory mapping */
 469     pc_pci_as_mapping_init(OBJECT(mch), mch->system_memory,
 470                            mch->pci_address_space);
 471
 472     /* if *disabled* show SMRAM to all CPUs */
 473     memory_region_init_alias(&mch->smram_region, OBJECT(mch), "smram-region",
 474                              mch->pci_address_space, 0xa0000, 0x20000);
 475     memory_region_add_subregion_overlap(mch->system_memory, 0xa0000,
 476                                         &mch->smram_region, 1);
 477     memory_region_set_enabled(&mch->smram_region, true);
 478
 479     memory_region_init_alias(&mch->open_high_smram, OBJECT(mch), "smram-open-high",
 480                              mch->ram_memory, 0xa0000, 0x20000);
 481     memory_region_add_subregion_overlap(mch->system_memory, 0xfeda0000,
 482                                         &mch->open_high_smram, 1);
 483     memory_region_set_enabled(&mch->open_high_smram, false);
 484
 485     /* smram, as seen by SMM CPUs */
 486     memory_region_init(&mch->smram, OBJECT(mch), "smram", 1ull << 32);
 487     memory_region_set_enabled(&mch->smram, true);
 488     memory_region_init_alias(&mch->low_smram, OBJECT(mch), "smram-low",
 489                              mch->ram_memory, 0xa0000, 0x20000);
 490     memory_region_set_enabled(&mch->low_smram, true);
 491     memory_region_add_subregion(&mch->smram, 0xa0000, &mch->low_smram);
 492     memory_region_init_alias(&mch->high_smram, OBJECT(mch), "smram-high",
 493                              mch->ram_memory, 0xa0000, 0x20000);
 494     memory_region_set_enabled(&mch->high_smram, true);
 495     memory_region_add_subregion(&mch->smram, 0xfeda0000, &mch->high_smram);
 496
 497     memory_region_init_io(&mch->tseg_blackhole, OBJECT(mch),
 498                           &tseg_blackhole_ops, NULL,
 499                           "tseg-blackhole", 0);
 500     memory_region_set_enabled(&mch->tseg_blackhole, false);
 501     memory_region_add_subregion_overlap(mch->system_memory,
 502                                         mch->below_4g_mem_size,
 503                                         &mch->tseg_blackhole, 1);
 504
 505     memory_region_init_alias(&mch->tseg_window, OBJECT(mch), "tseg-window",
 506                              mch->ram_memory, mch->below_4g_mem_size, 0);
 507     memory_region_set_enabled(&mch->tseg_window, false);
 508     memory_region_add_subregion(&mch->smram, mch->below_4g_mem_size,
 509                                 &mch->tseg_window);
 510     object_property_add_const_link(qdev_get_machine(), "smram",
 511                                    OBJECT(&mch->smram), &error_abort);
 512
 513     init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
 514              mch->pci_address_space, &mch->pam_regions[0],
 515              PAM_BIOS_BASE, PAM_BIOS_SIZE);
 516     for (i = 0; i < 12; ++i) {
 517         init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
 518                  mch->pci_address_space, &mch->pam_regions[i+1],
 519                  PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE);
 520     }
 521 }
 522
 523 uint64_t mch_mcfg_base(void)
 524 {
 525     bool ambiguous;
 526     Object *o = object_resolve_path_type("", TYPE_MCH_PCI_DEVICE, &ambiguous);
 527     if (!o) {
 528         return 0;
 529     }
 530     return MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
 531 }
 532
 533 static void mch_class_init(ObjectClass *klass, void *data)
 534 {
 535     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 536     DeviceClass *dc = DEVICE_CLASS(klass);
 537
 538     k->realize = mch_realize;
 539     k->config_write = mch_write_config;
 540     dc->reset = mch_reset;
 541     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 542     dc->desc = "Host bridge";
 543     dc->vmsd = &vmstate_mch;
 544     k->vendor_id = PCI_VENDOR_ID_INTEL;
 545     k->device_id = PCI_DEVICE_ID_INTEL_Q35_MCH;
 546     k->revision = MCH_HOST_BRIDGE_REVISION_DEFAULT;
 547     k->class_id = PCI_CLASS_BRIDGE_HOST;
 548     /*
 549      * PCI-facing part of the host bridge, not usable without the
 550      * host-facing part, which can't be device_add'ed, yet.
 551      */
 552     dc->cannot_instantiate_with_device_add_yet = true;
 553 }
 554
 555 static const TypeInfo mch_info = {
 556     .name = TYPE_MCH_PCI_DEVICE,
 557     .parent = TYPE_PCI_DEVICE,
 558     .instance_size = sizeof(MCHPCIState),
 559     .class_init = mch_class_init,
 560 };
 561
 562 static void q35_register(void)
 563 {
 564     type_register_static(&mch_info);
 565     type_register_static(&q35_host_info);
 566 }
 567
 568 type_init(q35_register);