1 /* 2 * QEMU i440FX PCI Bridge Emulation 3 * 4 * Copyright (c) 2006 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qemu/units.h" 27 #include "qemu/range.h" 28 #include "hw/i386/pc.h" 29 #include "hw/pci/pci.h" 30 #include "hw/pci/pci_host.h" 31 #include "hw/pci-host/i440fx.h" 32 #include "hw/qdev-properties.h" 33 #include "hw/sysbus.h" 34 #include "qapi/error.h" 35 #include "migration/vmstate.h" 36 #include "qapi/visitor.h" 37 #include "qemu/error-report.h" 38 #include "qom/object.h" 39 40 /* 41 * I440FX chipset data sheet. 42 * https://wiki.qemu.org/File:29054901.pdf 43 */ 44 45 OBJECT_DECLARE_SIMPLE_TYPE(I440FXState, I440FX_PCI_HOST_BRIDGE) 46 47 struct I440FXState { 48 PCIHostState parent_obj; 49 50 MemoryRegion *system_memory; 51 MemoryRegion *io_memory; 52 MemoryRegion *pci_address_space; 53 MemoryRegion *ram_memory; 54 Range pci_hole; 55 uint64_t below_4g_mem_size; 56 uint64_t above_4g_mem_size; 57 uint64_t pci_hole64_size; 58 bool pci_hole64_fix; 59 60 char *pci_type; 61 }; 62 63 #define I440FX_PAM 0x59 64 #define I440FX_PAM_SIZE 7 65 #define I440FX_SMRAM 0x72 66 67 /* Keep it 2G to comply with older win32 guests */ 68 #define I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT (1ULL << 31) 69 70 /* Older coreboot versions (4.0 and older) read a config register that doesn't 71 * exist in real hardware, to get the RAM size from QEMU. 72 */ 73 #define I440FX_COREBOOT_RAM_SIZE 0x57 74 75 static void i440fx_realize(PCIDevice *dev, Error **errp) 76 { 77 dev->config[I440FX_SMRAM] = 0x02; 78 79 if (object_property_get_bool(qdev_get_machine(), "iommu", NULL)) { 80 warn_report("i440fx doesn't support emulated iommu"); 81 } 82 } 83 84 static void i440fx_update_memory_mappings(PCII440FXState *d) 85 { 86 int i; 87 PCIDevice *pd = PCI_DEVICE(d); 88 89 memory_region_transaction_begin(); 90 for (i = 0; i < ARRAY_SIZE(d->pam_regions); i++) { 91 pam_update(&d->pam_regions[i], i, 92 pd->config[I440FX_PAM + DIV_ROUND_UP(i, 2)]); 93 } 94 memory_region_set_enabled(&d->smram_region, 95 !(pd->config[I440FX_SMRAM] & SMRAM_D_OPEN)); 96 memory_region_set_enabled(&d->smram, 97 pd->config[I440FX_SMRAM] & SMRAM_G_SMRAME); 98 memory_region_transaction_commit(); 99 } 100 101 102 static void i440fx_write_config(PCIDevice *dev, 103 uint32_t address, uint32_t val, int len) 104 { 105 PCII440FXState *d = I440FX_PCI_DEVICE(dev); 106 107 /* XXX: implement SMRAM.D_LOCK */ 108 pci_default_write_config(dev, address, val, len); 109 if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) || 110 range_covers_byte(address, len, I440FX_SMRAM)) { 111 i440fx_update_memory_mappings(d); 112 } 113 } 114 115 static int i440fx_post_load(void *opaque, int version_id) 116 { 117 PCII440FXState *d = opaque; 118 119 i440fx_update_memory_mappings(d); 120 return 0; 121 } 122 123 static const VMStateDescription vmstate_i440fx = { 124 .name = "I440FX", 125 .version_id = 3, 126 .minimum_version_id = 3, 127 .post_load = i440fx_post_load, 128 .fields = (VMStateField[]) { 129 VMSTATE_PCI_DEVICE(parent_obj, PCII440FXState), 130 /* Used to be smm_enabled, which was basically always zero because 131 * SeaBIOS hardly uses SMM. SMRAM is now handled by CPU code. 132 */ 133 VMSTATE_UNUSED(1), 134 VMSTATE_END_OF_LIST() 135 } 136 }; 137 138 static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v, 139 const char *name, void *opaque, 140 Error **errp) 141 { 142 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); 143 uint64_t val64; 144 uint32_t value; 145 146 val64 = range_is_empty(&s->pci_hole) ? 0 : range_lob(&s->pci_hole); 147 value = val64; 148 assert(value == val64); 149 visit_type_uint32(v, name, &value, errp); 150 } 151 152 static void i440fx_pcihost_get_pci_hole_end(Object *obj, Visitor *v, 153 const char *name, void *opaque, 154 Error **errp) 155 { 156 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); 157 uint64_t val64; 158 uint32_t value; 159 160 val64 = range_is_empty(&s->pci_hole) ? 0 : range_upb(&s->pci_hole) + 1; 161 value = val64; 162 assert(value == val64); 163 visit_type_uint32(v, name, &value, errp); 164 } 165 166 /* 167 * The 64bit PCI hole start is set by the Guest firmware 168 * as the address of the first 64bit PCI MEM resource. 169 * If no PCI device has resources on the 64bit area, 170 * the 64bit PCI hole will start after "over 4G RAM" and the 171 * reserved space for memory hotplug if any. 172 */ 173 static uint64_t i440fx_pcihost_get_pci_hole64_start_value(Object *obj) 174 { 175 PCIHostState *h = PCI_HOST_BRIDGE(obj); 176 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); 177 Range w64; 178 uint64_t value; 179 180 pci_bus_get_w64_range(h->bus, &w64); 181 value = range_is_empty(&w64) ? 0 : range_lob(&w64); 182 if (!value && s->pci_hole64_fix) { 183 value = pc_pci_hole64_start(); 184 } 185 return value; 186 } 187 188 static void i440fx_pcihost_get_pci_hole64_start(Object *obj, Visitor *v, 189 const char *name, 190 void *opaque, Error **errp) 191 { 192 uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj); 193 194 visit_type_uint64(v, name, &hole64_start, errp); 195 } 196 197 /* 198 * The 64bit PCI hole end is set by the Guest firmware 199 * as the address of the last 64bit PCI MEM resource. 200 * Then it is expanded to the PCI_HOST_PROP_PCI_HOLE64_SIZE 201 * that can be configured by the user. 202 */ 203 static void i440fx_pcihost_get_pci_hole64_end(Object *obj, Visitor *v, 204 const char *name, void *opaque, 205 Error **errp) 206 { 207 PCIHostState *h = PCI_HOST_BRIDGE(obj); 208 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); 209 uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj); 210 Range w64; 211 uint64_t value, hole64_end; 212 213 pci_bus_get_w64_range(h->bus, &w64); 214 value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1; 215 hole64_end = ROUND_UP(hole64_start + s->pci_hole64_size, 1ULL << 30); 216 if (s->pci_hole64_fix && value < hole64_end) { 217 value = hole64_end; 218 } 219 visit_type_uint64(v, name, &value, errp); 220 } 221 222 static void i440fx_pcihost_initfn(Object *obj) 223 { 224 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); 225 PCIHostState *phb = PCI_HOST_BRIDGE(obj); 226 227 memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb, 228 "pci-conf-idx", 4); 229 memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb, 230 "pci-conf-data", 4); 231 232 object_property_add_link(obj, PCI_HOST_PROP_RAM_MEM, TYPE_MEMORY_REGION, 233 (Object **) &s->ram_memory, 234 qdev_prop_allow_set_link_before_realize, 0); 235 236 object_property_add_link(obj, PCI_HOST_PROP_PCI_MEM, TYPE_MEMORY_REGION, 237 (Object **) &s->pci_address_space, 238 qdev_prop_allow_set_link_before_realize, 0); 239 240 object_property_add_link(obj, PCI_HOST_PROP_SYSTEM_MEM, TYPE_MEMORY_REGION, 241 (Object **) &s->system_memory, 242 qdev_prop_allow_set_link_before_realize, 0); 243 244 object_property_add_link(obj, PCI_HOST_PROP_IO_MEM, TYPE_MEMORY_REGION, 245 (Object **) &s->io_memory, 246 qdev_prop_allow_set_link_before_realize, 0); 247 } 248 249 static void i440fx_pcihost_realize(DeviceState *dev, Error **errp) 250 { 251 ERRP_GUARD(); 252 I440FXState *s = I440FX_PCI_HOST_BRIDGE(dev); 253 PCIHostState *phb = PCI_HOST_BRIDGE(dev); 254 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 255 PCIBus *b; 256 PCIDevice *d; 257 PCII440FXState *f; 258 unsigned i; 259 260 memory_region_add_subregion(s->io_memory, 0xcf8, &phb->conf_mem); 261 sysbus_init_ioports(sbd, 0xcf8, 4); 262 263 memory_region_add_subregion(s->io_memory, 0xcfc, &phb->data_mem); 264 sysbus_init_ioports(sbd, 0xcfc, 4); 265 266 /* register i440fx 0xcf8 port as coalesced pio */ 267 memory_region_set_flush_coalesced(&phb->data_mem); 268 memory_region_add_coalescing(&phb->conf_mem, 0, 4); 269 270 b = pci_root_bus_new(dev, NULL, s->pci_address_space, 271 s->io_memory, 0, TYPE_PCI_BUS); 272 phb->bus = b; 273 274 d = pci_create_simple(b, 0, s->pci_type); 275 f = I440FX_PCI_DEVICE(d); 276 277 range_set_bounds(&s->pci_hole, s->below_4g_mem_size, 278 IO_APIC_DEFAULT_ADDRESS - 1); 279 280 /* setup pci memory mapping */ 281 pc_pci_as_mapping_init(s->system_memory, s->pci_address_space); 282 283 /* if *disabled* show SMRAM to all CPUs */ 284 memory_region_init_alias(&f->smram_region, OBJECT(d), "smram-region", 285 s->pci_address_space, SMRAM_C_BASE, SMRAM_C_SIZE); 286 memory_region_add_subregion_overlap(s->system_memory, SMRAM_C_BASE, 287 &f->smram_region, 1); 288 memory_region_set_enabled(&f->smram_region, true); 289 290 /* smram, as seen by SMM CPUs */ 291 memory_region_init(&f->smram, OBJECT(d), "smram", 4 * GiB); 292 memory_region_set_enabled(&f->smram, true); 293 memory_region_init_alias(&f->low_smram, OBJECT(d), "smram-low", 294 s->ram_memory, SMRAM_C_BASE, SMRAM_C_SIZE); 295 memory_region_set_enabled(&f->low_smram, true); 296 memory_region_add_subregion(&f->smram, SMRAM_C_BASE, &f->low_smram); 297 object_property_add_const_link(qdev_get_machine(), "smram", 298 OBJECT(&f->smram)); 299 300 init_pam(&f->pam_regions[0], OBJECT(d), s->ram_memory, s->system_memory, 301 s->pci_address_space, PAM_BIOS_BASE, PAM_BIOS_SIZE); 302 for (i = 0; i < ARRAY_SIZE(f->pam_regions) - 1; ++i) { 303 init_pam(&f->pam_regions[i + 1], OBJECT(d), s->ram_memory, 304 s->system_memory, s->pci_address_space, 305 PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE); 306 } 307 308 ram_addr_t ram_size = s->below_4g_mem_size + s->above_4g_mem_size; 309 ram_size = ram_size / 8 / 1024 / 1024; 310 if (ram_size > 255) { 311 ram_size = 255; 312 } 313 d->config[I440FX_COREBOOT_RAM_SIZE] = ram_size; 314 315 i440fx_update_memory_mappings(f); 316 } 317 318 static void i440fx_class_init(ObjectClass *klass, void *data) 319 { 320 DeviceClass *dc = DEVICE_CLASS(klass); 321 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 322 323 k->realize = i440fx_realize; 324 k->config_write = i440fx_write_config; 325 k->vendor_id = PCI_VENDOR_ID_INTEL; 326 k->device_id = PCI_DEVICE_ID_INTEL_82441; 327 k->revision = 0x02; 328 k->class_id = PCI_CLASS_BRIDGE_HOST; 329 dc->desc = "Host bridge"; 330 dc->vmsd = &vmstate_i440fx; 331 /* 332 * PCI-facing part of the host bridge, not usable without the 333 * host-facing part, which can't be device_add'ed, yet. 334 */ 335 dc->user_creatable = false; 336 dc->hotpluggable = false; 337 } 338 339 static const TypeInfo i440fx_info = { 340 .name = TYPE_I440FX_PCI_DEVICE, 341 .parent = TYPE_PCI_DEVICE, 342 .instance_size = sizeof(PCII440FXState), 343 .class_init = i440fx_class_init, 344 .interfaces = (InterfaceInfo[]) { 345 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 346 { }, 347 }, 348 }; 349 350 static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge, 351 PCIBus *rootbus) 352 { 353 return "0000:00"; 354 } 355 356 static Property i440fx_props[] = { 357 DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, I440FXState, 358 pci_hole64_size, I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT), 359 DEFINE_PROP_SIZE(PCI_HOST_BELOW_4G_MEM_SIZE, I440FXState, 360 below_4g_mem_size, 0), 361 DEFINE_PROP_SIZE(PCI_HOST_ABOVE_4G_MEM_SIZE, I440FXState, 362 above_4g_mem_size, 0), 363 DEFINE_PROP_BOOL("x-pci-hole64-fix", I440FXState, pci_hole64_fix, true), 364 DEFINE_PROP_STRING(I440FX_HOST_PROP_PCI_TYPE, I440FXState, pci_type), 365 DEFINE_PROP_END_OF_LIST(), 366 }; 367 368 static void i440fx_pcihost_class_init(ObjectClass *klass, void *data) 369 { 370 DeviceClass *dc = DEVICE_CLASS(klass); 371 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass); 372 373 hc->root_bus_path = i440fx_pcihost_root_bus_path; 374 dc->realize = i440fx_pcihost_realize; 375 dc->fw_name = "pci"; 376 device_class_set_props(dc, i440fx_props); 377 /* Reason: needs to be wired up by pc_init1 */ 378 dc->user_creatable = false; 379 380 object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE_START, "uint32", 381 i440fx_pcihost_get_pci_hole_start, 382 NULL, NULL, NULL); 383 384 object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE_END, "uint32", 385 i440fx_pcihost_get_pci_hole_end, 386 NULL, NULL, NULL); 387 388 object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE64_START, "uint64", 389 i440fx_pcihost_get_pci_hole64_start, 390 NULL, NULL, NULL); 391 392 object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE64_END, "uint64", 393 i440fx_pcihost_get_pci_hole64_end, 394 NULL, NULL, NULL); 395 } 396 397 static const TypeInfo i440fx_pcihost_info = { 398 .name = TYPE_I440FX_PCI_HOST_BRIDGE, 399 .parent = TYPE_PCI_HOST_BRIDGE, 400 .instance_size = sizeof(I440FXState), 401 .instance_init = i440fx_pcihost_initfn, 402 .class_init = i440fx_pcihost_class_init, 403 }; 404 405 static void i440fx_register_types(void) 406 { 407 type_register_static(&i440fx_info); 408 type_register_static(&i440fx_pcihost_info); 409 } 410 411 type_init(i440fx_register_types) 412