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 Range pci_hole; 50 uint64_t pci_hole64_size; 51 bool pci_hole64_fix; 52 uint32_t short_root_bus; 53 }; 54 55 #define I440FX_PAM 0x59 56 #define I440FX_PAM_SIZE 7 57 #define I440FX_SMRAM 0x72 58 59 /* Keep it 2G to comply with older win32 guests */ 60 #define I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT (1ULL << 31) 61 62 /* Older coreboot versions (4.0 and older) read a config register that doesn't 63 * exist in real hardware, to get the RAM size from QEMU. 64 */ 65 #define I440FX_COREBOOT_RAM_SIZE 0x57 66 67 static void i440fx_update_memory_mappings(PCII440FXState *d) 68 { 69 int i; 70 PCIDevice *pd = PCI_DEVICE(d); 71 72 memory_region_transaction_begin(); 73 for (i = 0; i < ARRAY_SIZE(d->pam_regions); i++) { 74 pam_update(&d->pam_regions[i], i, 75 pd->config[I440FX_PAM + DIV_ROUND_UP(i, 2)]); 76 } 77 memory_region_set_enabled(&d->smram_region, 78 !(pd->config[I440FX_SMRAM] & SMRAM_D_OPEN)); 79 memory_region_set_enabled(&d->smram, 80 pd->config[I440FX_SMRAM] & SMRAM_G_SMRAME); 81 memory_region_transaction_commit(); 82 } 83 84 85 static void i440fx_write_config(PCIDevice *dev, 86 uint32_t address, uint32_t val, int len) 87 { 88 PCII440FXState *d = I440FX_PCI_DEVICE(dev); 89 90 /* XXX: implement SMRAM.D_LOCK */ 91 pci_default_write_config(dev, address, val, len); 92 if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) || 93 range_covers_byte(address, len, I440FX_SMRAM)) { 94 i440fx_update_memory_mappings(d); 95 } 96 } 97 98 static int i440fx_post_load(void *opaque, int version_id) 99 { 100 PCII440FXState *d = opaque; 101 102 i440fx_update_memory_mappings(d); 103 return 0; 104 } 105 106 static const VMStateDescription vmstate_i440fx = { 107 .name = "I440FX", 108 .version_id = 3, 109 .minimum_version_id = 3, 110 .post_load = i440fx_post_load, 111 .fields = (VMStateField[]) { 112 VMSTATE_PCI_DEVICE(parent_obj, PCII440FXState), 113 /* Used to be smm_enabled, which was basically always zero because 114 * SeaBIOS hardly uses SMM. SMRAM is now handled by CPU code. 115 */ 116 VMSTATE_UNUSED(1), 117 VMSTATE_END_OF_LIST() 118 } 119 }; 120 121 static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v, 122 const char *name, void *opaque, 123 Error **errp) 124 { 125 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); 126 uint64_t val64; 127 uint32_t value; 128 129 val64 = range_is_empty(&s->pci_hole) ? 0 : range_lob(&s->pci_hole); 130 value = val64; 131 assert(value == val64); 132 visit_type_uint32(v, name, &value, errp); 133 } 134 135 static void i440fx_pcihost_get_pci_hole_end(Object *obj, Visitor *v, 136 const char *name, void *opaque, 137 Error **errp) 138 { 139 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); 140 uint64_t val64; 141 uint32_t value; 142 143 val64 = range_is_empty(&s->pci_hole) ? 0 : range_upb(&s->pci_hole) + 1; 144 value = val64; 145 assert(value == val64); 146 visit_type_uint32(v, name, &value, errp); 147 } 148 149 /* 150 * The 64bit PCI hole start is set by the Guest firmware 151 * as the address of the first 64bit PCI MEM resource. 152 * If no PCI device has resources on the 64bit area, 153 * the 64bit PCI hole will start after "over 4G RAM" and the 154 * reserved space for memory hotplug if any. 155 */ 156 static uint64_t i440fx_pcihost_get_pci_hole64_start_value(Object *obj) 157 { 158 PCIHostState *h = PCI_HOST_BRIDGE(obj); 159 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); 160 Range w64; 161 uint64_t value; 162 163 pci_bus_get_w64_range(h->bus, &w64); 164 value = range_is_empty(&w64) ? 0 : range_lob(&w64); 165 if (!value && s->pci_hole64_fix) { 166 value = pc_pci_hole64_start(); 167 } 168 return value; 169 } 170 171 static void i440fx_pcihost_get_pci_hole64_start(Object *obj, Visitor *v, 172 const char *name, 173 void *opaque, Error **errp) 174 { 175 uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj); 176 177 visit_type_uint64(v, name, &hole64_start, errp); 178 } 179 180 /* 181 * The 64bit PCI hole end is set by the Guest firmware 182 * as the address of the last 64bit PCI MEM resource. 183 * Then it is expanded to the PCI_HOST_PROP_PCI_HOLE64_SIZE 184 * that can be configured by the user. 185 */ 186 static void i440fx_pcihost_get_pci_hole64_end(Object *obj, Visitor *v, 187 const char *name, void *opaque, 188 Error **errp) 189 { 190 PCIHostState *h = PCI_HOST_BRIDGE(obj); 191 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); 192 uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj); 193 Range w64; 194 uint64_t value, hole64_end; 195 196 pci_bus_get_w64_range(h->bus, &w64); 197 value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1; 198 hole64_end = ROUND_UP(hole64_start + s->pci_hole64_size, 1ULL << 30); 199 if (s->pci_hole64_fix && value < hole64_end) { 200 value = hole64_end; 201 } 202 visit_type_uint64(v, name, &value, errp); 203 } 204 205 static void i440fx_pcihost_initfn(Object *obj) 206 { 207 PCIHostState *s = PCI_HOST_BRIDGE(obj); 208 209 memory_region_init_io(&s->conf_mem, obj, &pci_host_conf_le_ops, s, 210 "pci-conf-idx", 4); 211 memory_region_init_io(&s->data_mem, obj, &pci_host_data_le_ops, s, 212 "pci-conf-data", 4); 213 } 214 215 static void i440fx_pcihost_realize(DeviceState *dev, Error **errp) 216 { 217 PCIHostState *s = PCI_HOST_BRIDGE(dev); 218 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 219 220 sysbus_add_io(sbd, 0xcf8, &s->conf_mem); 221 sysbus_init_ioports(sbd, 0xcf8, 4); 222 223 sysbus_add_io(sbd, 0xcfc, &s->data_mem); 224 sysbus_init_ioports(sbd, 0xcfc, 4); 225 226 /* register i440fx 0xcf8 port as coalesced pio */ 227 memory_region_set_flush_coalesced(&s->data_mem); 228 memory_region_add_coalescing(&s->conf_mem, 0, 4); 229 } 230 231 static void i440fx_realize(PCIDevice *dev, Error **errp) 232 { 233 dev->config[I440FX_SMRAM] = 0x02; 234 235 if (object_property_get_bool(qdev_get_machine(), "iommu", NULL)) { 236 warn_report("i440fx doesn't support emulated iommu"); 237 } 238 } 239 240 PCIBus *i440fx_init(const char *host_type, const char *pci_type, 241 MemoryRegion *address_space_mem, 242 MemoryRegion *address_space_io, 243 ram_addr_t ram_size, 244 ram_addr_t below_4g_mem_size, 245 ram_addr_t above_4g_mem_size, 246 MemoryRegion *pci_address_space, 247 MemoryRegion *ram_memory) 248 { 249 DeviceState *dev; 250 PCIBus *b; 251 PCIDevice *d; 252 PCIHostState *s; 253 PCII440FXState *f; 254 unsigned i; 255 I440FXState *i440fx; 256 257 dev = qdev_new(host_type); 258 s = PCI_HOST_BRIDGE(dev); 259 b = pci_root_bus_new(dev, NULL, pci_address_space, 260 address_space_io, 0, TYPE_PCI_BUS); 261 s->bus = b; 262 object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev)); 263 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); 264 265 d = pci_create_simple(b, 0, pci_type); 266 f = I440FX_PCI_DEVICE(d); 267 f->system_memory = address_space_mem; 268 f->pci_address_space = pci_address_space; 269 f->ram_memory = ram_memory; 270 271 i440fx = I440FX_PCI_HOST_BRIDGE(dev); 272 range_set_bounds(&i440fx->pci_hole, below_4g_mem_size, 273 IO_APIC_DEFAULT_ADDRESS - 1); 274 275 /* setup pci memory mapping */ 276 pc_pci_as_mapping_init(OBJECT(f), f->system_memory, 277 f->pci_address_space); 278 279 /* if *disabled* show SMRAM to all CPUs */ 280 memory_region_init_alias(&f->smram_region, OBJECT(d), "smram-region", 281 f->pci_address_space, 0xa0000, 0x20000); 282 memory_region_add_subregion_overlap(f->system_memory, 0xa0000, 283 &f->smram_region, 1); 284 memory_region_set_enabled(&f->smram_region, true); 285 286 /* smram, as seen by SMM CPUs */ 287 memory_region_init(&f->smram, OBJECT(d), "smram", 4 * GiB); 288 memory_region_set_enabled(&f->smram, true); 289 memory_region_init_alias(&f->low_smram, OBJECT(d), "smram-low", 290 f->ram_memory, 0xa0000, 0x20000); 291 memory_region_set_enabled(&f->low_smram, true); 292 memory_region_add_subregion(&f->smram, 0xa0000, &f->low_smram); 293 object_property_add_const_link(qdev_get_machine(), "smram", 294 OBJECT(&f->smram)); 295 296 init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space, 297 &f->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE); 298 for (i = 0; i < ARRAY_SIZE(f->pam_regions) - 1; ++i) { 299 init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space, 300 &f->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, 301 PAM_EXPAN_SIZE); 302 } 303 304 ram_size = ram_size / 8 / 1024 / 1024; 305 if (ram_size > 255) { 306 ram_size = 255; 307 } 308 d->config[I440FX_COREBOOT_RAM_SIZE] = ram_size; 309 310 i440fx_update_memory_mappings(f); 311 312 return b; 313 } 314 315 static void i440fx_class_init(ObjectClass *klass, void *data) 316 { 317 DeviceClass *dc = DEVICE_CLASS(klass); 318 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 319 320 k->realize = i440fx_realize; 321 k->config_write = i440fx_write_config; 322 k->vendor_id = PCI_VENDOR_ID_INTEL; 323 k->device_id = PCI_DEVICE_ID_INTEL_82441; 324 k->revision = 0x02; 325 k->class_id = PCI_CLASS_BRIDGE_HOST; 326 dc->desc = "Host bridge"; 327 dc->vmsd = &vmstate_i440fx; 328 /* 329 * PCI-facing part of the host bridge, not usable without the 330 * host-facing part, which can't be device_add'ed, yet. 331 */ 332 dc->user_creatable = false; 333 dc->hotpluggable = false; 334 } 335 336 static const TypeInfo i440fx_info = { 337 .name = TYPE_I440FX_PCI_DEVICE, 338 .parent = TYPE_PCI_DEVICE, 339 .instance_size = sizeof(PCII440FXState), 340 .class_init = i440fx_class_init, 341 .interfaces = (InterfaceInfo[]) { 342 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 343 { }, 344 }, 345 }; 346 347 static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge, 348 PCIBus *rootbus) 349 { 350 I440FXState *s = I440FX_PCI_HOST_BRIDGE(host_bridge); 351 352 /* For backwards compat with old device paths */ 353 if (s->short_root_bus) { 354 return "0000"; 355 } 356 return "0000:00"; 357 } 358 359 static Property i440fx_props[] = { 360 DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, I440FXState, 361 pci_hole64_size, I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT), 362 DEFINE_PROP_UINT32("short_root_bus", I440FXState, short_root_bus, 0), 363 DEFINE_PROP_BOOL("x-pci-hole64-fix", I440FXState, pci_hole64_fix, true), 364 DEFINE_PROP_END_OF_LIST(), 365 }; 366 367 static void i440fx_pcihost_class_init(ObjectClass *klass, void *data) 368 { 369 DeviceClass *dc = DEVICE_CLASS(klass); 370 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass); 371 372 hc->root_bus_path = i440fx_pcihost_root_bus_path; 373 dc->realize = i440fx_pcihost_realize; 374 dc->fw_name = "pci"; 375 device_class_set_props(dc, i440fx_props); 376 /* Reason: needs to be wired up by pc_init1 */ 377 dc->user_creatable = false; 378 379 object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE_START, "uint32", 380 i440fx_pcihost_get_pci_hole_start, 381 NULL, NULL, NULL); 382 383 object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE_END, "uint32", 384 i440fx_pcihost_get_pci_hole_end, 385 NULL, NULL, NULL); 386 387 object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE64_START, "uint64", 388 i440fx_pcihost_get_pci_hole64_start, 389 NULL, NULL, NULL); 390 391 object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE64_END, "uint64", 392 i440fx_pcihost_get_pci_hole64_end, 393 NULL, NULL, NULL); 394 } 395 396 static const TypeInfo i440fx_pcihost_info = { 397 .name = TYPE_I440FX_PCI_HOST_BRIDGE, 398 .parent = TYPE_PCI_HOST_BRIDGE, 399 .instance_size = sizeof(I440FXState), 400 .instance_init = i440fx_pcihost_initfn, 401 .class_init = i440fx_pcihost_class_init, 402 }; 403 404 static void i440fx_register_types(void) 405 { 406 type_register_static(&i440fx_info); 407 type_register_static(&i440fx_pcihost_info); 408 } 409 410 type_init(i440fx_register_types) 411