1 /* 2 * Copyright 2003-2006, Haiku Inc. All rights reserved. 3 * Distributed under the terms of the MIT License. 4 * 5 * Authors: 6 * Axel Dörfler <axeld@pinc-software.de> 7 * Ingo Weinhold <bonefish@cs.tu-berlin.de> 8 * 9 * Copyright 2001, Travis Geiselbrecht. All rights reserved. 10 * Distributed under the terms of the NewOS License. 11 */ 12 13 #include <int.h> 14 15 #include <arch/smp.h> 16 #include <boot/kernel_args.h> 17 #include <device_manager.h> 18 #include <kscheduler.h> 19 #include <interrupt_controller.h> 20 #include <smp.h> 21 #include <thread.h> 22 #include <timer.h> 23 #include <util/DoublyLinkedList.h> 24 #include <util/kernel_cpp.h> 25 #include <vm.h> 26 #include <vm_address_space.h> 27 #include <vm_priv.h> 28 29 #include <string.h> 30 31 // defined in arch_exceptions.S 32 extern int __irqvec_start; 33 extern int __irqvec_end; 34 35 extern"C" void ppc_exception_tail(void); 36 37 38 // the exception contexts for all CPUs 39 static ppc_cpu_exception_context sCPUExceptionContexts[SMP_MAX_CPUS]; 40 41 42 // An iframe stack used in the early boot process when we don't have 43 // threads yet. 44 struct iframe_stack gBootFrameStack; 45 46 // interrupt controller interface (initialized 47 // in arch_int_init_post_device_manager()) 48 static struct interrupt_controller_module_info *sPIC; 49 static void *sPICCookie; 50 51 52 void 53 arch_int_enable_io_interrupt(int irq) 54 { 55 if (!sPIC) 56 return; 57 58 // TODO: I have no idea, what IRQ type is appropriate. 59 sPIC->enable_io_interrupt(sPICCookie, irq, IRQ_TYPE_LEVEL); 60 } 61 62 63 void 64 arch_int_disable_io_interrupt(int irq) 65 { 66 if (!sPIC) 67 return; 68 69 sPIC->disable_io_interrupt(sPICCookie, irq); 70 } 71 72 73 /* arch_int_*_interrupts() and friends are in arch_asm.S */ 74 75 76 static void 77 print_iframe(struct iframe *frame) 78 { 79 dprintf("iframe at %p:\n", frame); 80 dprintf("r0-r3: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->r0, frame->r1, frame->r2, frame->r3); 81 dprintf("r4-r7: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->r4, frame->r5, frame->r6, frame->r7); 82 dprintf("r8-r11: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->r8, frame->r9, frame->r10, frame->r11); 83 dprintf("r12-r15: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->r12, frame->r13, frame->r14, frame->r15); 84 dprintf("r16-r19: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->r16, frame->r17, frame->r18, frame->r19); 85 dprintf("r20-r23: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->r20, frame->r21, frame->r22, frame->r23); 86 dprintf("r24-r27: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->r24, frame->r25, frame->r26, frame->r27); 87 dprintf("r28-r31: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->r28, frame->r29, frame->r30, frame->r31); 88 dprintf(" ctr 0x%08lx xer 0x%08lx\n", frame->ctr, frame->xer); 89 dprintf(" cr 0x%08lx lr 0x%08lx\n", frame->cr, frame->lr); 90 dprintf(" dsisr 0x%08lx dar 0x%08lx\n", frame->dsisr, frame->dar); 91 dprintf(" srr1 0x%08lx srr0 0x%08lx\n", frame->srr1, frame->srr0); 92 } 93 94 95 extern "C" void ppc_exception_entry(int vector, struct iframe *iframe); 96 void 97 ppc_exception_entry(int vector, struct iframe *iframe) 98 { 99 int ret = B_HANDLED_INTERRUPT; 100 101 if (vector != 0x900) { 102 dprintf("ppc_exception_entry: time %lld vector 0x%x, iframe %p, " 103 "srr0: %p\n", system_time(), vector, iframe, (void*)iframe->srr0); 104 } 105 106 struct thread *thread = thread_get_current_thread(); 107 108 // push iframe 109 if (thread) 110 ppc_push_iframe(&thread->arch_info.iframes, iframe); 111 else 112 ppc_push_iframe(&gBootFrameStack, iframe); 113 114 switch (vector) { 115 case 0x100: // system reset 116 panic("system reset exception\n"); 117 break; 118 case 0x200: // machine check 119 panic("machine check exception\n"); 120 break; 121 case 0x300: // DSI 122 case 0x400: // ISI 123 { 124 bool kernelDebugger = debug_debugger_running(); 125 126 if (kernelDebugger) { 127 // if this thread has a fault handler, we're allowed to be here 128 struct thread *thread = thread_get_current_thread(); 129 if (thread && thread->fault_handler != NULL) { 130 iframe->srr0 = thread->fault_handler; 131 break; 132 } 133 134 // otherwise, not really 135 panic("page fault in debugger without fault handler! Touching " 136 "address %p from ip %p\n", (void *)iframe->dar, 137 (void *)iframe->srr0); 138 break; 139 } else if ((iframe->srr1 & MSR_EXCEPTIONS_ENABLED) == 0) { 140 // if the interrupts were disabled, and we are not running the 141 // kernel startup the page fault was not allowed to happen and 142 // we must panic 143 panic("page fault, but interrupts were disabled. Touching " 144 "address %p from ip %p\n", (void *)iframe->dar, 145 (void *)iframe->srr0); 146 break; 147 } else if (thread != NULL && thread->page_faults_allowed < 1) { 148 panic("page fault not allowed at this place. Touching address " 149 "%p from ip %p\n", (void *)iframe->dar, 150 (void *)iframe->srr0); 151 } 152 153 enable_interrupts(); 154 155 addr_t newip; 156 157 ret = vm_page_fault(iframe->dar, iframe->srr0, 158 iframe->dsisr & (1 << 25), // store or load 159 iframe->srr1 & (1 << 14), // was the system in user or supervisor 160 &newip); 161 if (newip != 0) { 162 // the page fault handler wants us to modify the iframe to set the 163 // IP the cpu will return to to be this ip 164 iframe->srr0 = newip; 165 } 166 break; 167 } 168 169 case 0x500: // external interrupt 170 { 171 if (!sPIC) { 172 panic("ppc_exception_entry(): external interrupt although we " 173 "don't have a PIC driver!"); 174 ret = B_HANDLED_INTERRUPT; 175 break; 176 } 177 178 dprintf("handling I/O interrupts...\n"); 179 int irq; 180 while ((irq = sPIC->acknowledge_io_interrupt(sPICCookie)) >= 0) { 181 // TODO: correctly pass level-triggered vs. edge-triggered to the handler! 182 ret = int_io_interrupt_handler(irq, true); 183 } 184 dprintf("handling I/O interrupts done\n"); 185 break; 186 } 187 188 case 0x600: // alignment exception 189 panic("alignment exception: unimplemented\n"); 190 break; 191 case 0x700: // program exception 192 panic("program exception: unimplemented\n"); 193 break; 194 case 0x800: // FP unavailable exception 195 panic("FP unavailable exception: unimplemented\n"); 196 break; 197 case 0x900: // decrementer exception 198 ret = timer_interrupt(); 199 break; 200 case 0xc00: // system call 201 panic("system call exception: unimplemented\n"); 202 break; 203 case 0xd00: // trace exception 204 panic("trace exception: unimplemented\n"); 205 break; 206 case 0xe00: // FP assist exception 207 panic("FP assist exception: unimplemented\n"); 208 break; 209 case 0xf00: // performance monitor exception 210 panic("performance monitor exception: unimplemented\n"); 211 break; 212 case 0xf20: // altivec unavailable exception 213 panic("alitivec unavailable exception: unimplemented\n"); 214 break; 215 case 0x1000: 216 case 0x1100: 217 case 0x1200: 218 panic("TLB miss exception: unimplemented\n"); 219 break; 220 case 0x1300: // instruction address exception 221 panic("instruction address exception: unimplemented\n"); 222 break; 223 case 0x1400: // system management exception 224 panic("system management exception: unimplemented\n"); 225 break; 226 case 0x1600: // altivec assist exception 227 panic("altivec assist exception: unimplemented\n"); 228 break; 229 case 0x1700: // thermal management exception 230 panic("thermal management exception: unimplemented\n"); 231 break; 232 default: 233 dprintf("unhandled exception type 0x%x\n", vector); 234 print_iframe(iframe); 235 panic("unhandled exception type\n"); 236 } 237 238 if (ret == B_INVOKE_SCHEDULER) { 239 int state = disable_interrupts(); 240 GRAB_THREAD_LOCK(); 241 scheduler_reschedule(); 242 RELEASE_THREAD_LOCK(); 243 restore_interrupts(state); 244 } 245 246 // pop iframe 247 if (thread) 248 ppc_pop_iframe(&thread->arch_info.iframes); 249 else 250 ppc_pop_iframe(&gBootFrameStack); 251 } 252 253 254 status_t 255 arch_int_init(kernel_args *args) 256 { 257 return B_OK; 258 } 259 260 261 status_t 262 arch_int_init_post_vm(kernel_args *args) 263 { 264 void *handlers = (void *)args->arch_args.exception_handlers.start; 265 266 // We may need to remap the exception handler area into the kernel address 267 // space. 268 if (!IS_KERNEL_ADDRESS(handlers)) { 269 addr_t address = (addr_t)handlers; 270 status_t error = ppc_remap_address_range(&address, 271 args->arch_args.exception_handlers.size, true); 272 if (error != B_OK) { 273 panic("arch_int_init_post_vm(): Failed to remap the exception " 274 "handler area!"); 275 return error; 276 } 277 handlers = (void*)(address); 278 } 279 280 // create a region to map the irq vector code into (physical address 0x0) 281 area_id exceptionArea = create_area("exception_handlers", 282 &handlers, B_EXACT_ADDRESS, args->arch_args.exception_handlers.size, 283 B_ALREADY_WIRED, B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA); 284 if (exceptionArea < B_OK) 285 panic("arch_int_init2: could not create exception handler region\n"); 286 287 dprintf("exception handlers at %p\n", handlers); 288 289 // copy the handlers into this area 290 memcpy(handlers, &__irqvec_start, args->arch_args.exception_handlers.size); 291 arch_cpu_sync_icache(handlers, args->arch_args.exception_handlers.size); 292 293 // init the CPU exception contexts 294 int cpuCount = smp_get_num_cpus(); 295 for (int i = 0; i < cpuCount; i++) { 296 ppc_cpu_exception_context *context = ppc_get_cpu_exception_context(i); 297 context->kernel_handle_exception = (void*)&ppc_exception_tail; 298 context->exception_context = context; 299 // kernel_stack is set when the current thread changes. At this point 300 // we don't have threads yet. 301 } 302 303 // set the exception context for this CPU 304 ppc_set_current_cpu_exception_context(ppc_get_cpu_exception_context(0)); 305 306 return B_OK; 307 } 308 309 310 template<typename ModuleInfo> 311 struct Module : DoublyLinkedListLinkImpl<Module<ModuleInfo> > { 312 Module(ModuleInfo *module) 313 : module(module) 314 { 315 } 316 317 ~Module() 318 { 319 if (module) 320 put_module(((module_info*)module)->name); 321 } 322 323 ModuleInfo *module; 324 }; 325 326 typedef Module<interrupt_controller_module_info> PICModule; 327 328 struct PICModuleList : DoublyLinkedList<PICModule> { 329 ~PICModuleList() 330 { 331 while (PICModule *module = First()) { 332 Remove(module); 333 delete module; 334 } 335 } 336 }; 337 338 339 class DeviceTreeIterator { 340 public: 341 DeviceTreeIterator(device_manager_info *deviceManager) 342 : fDeviceManager(deviceManager), 343 fNode(NULL), 344 fParent(NULL) 345 { 346 Rewind(); 347 } 348 349 ~DeviceTreeIterator() 350 { 351 if (fParent != NULL) 352 fDeviceManager->put_node(fParent); 353 if (fNode != NULL) 354 fDeviceManager->put_node(fNode); 355 } 356 357 void Rewind() 358 { 359 fNode = fDeviceManager->get_root_node(); 360 } 361 362 bool HasNext() const 363 { 364 return (fNode != NULL); 365 } 366 367 device_node *Next() 368 { 369 if (fNode == NULL) 370 return NULL; 371 372 device_node *foundNode = fNode; 373 374 // get first child 375 device_node *child = NULL; 376 if (fDeviceManager->get_next_child_node(fNode, NULL, &child) 377 == B_OK) { 378 // move to the child node 379 if (fParent != NULL) 380 fDeviceManager->put_node(fParent); 381 fParent = fNode; 382 fNode = child; 383 384 // no more children; backtrack to find the next sibling 385 } else { 386 while (fParent != NULL) { 387 if (fDeviceManager->get_next_child_node(fParent, NULL, &fNode) 388 == B_OK) { 389 // get_next_child_node() always puts the node 390 break; 391 } 392 fNode = fParent; 393 fParent = fDeviceManager->get_parent_node(fNode); 394 } 395 396 // if we hit the root node again, we're done 397 if (fParent == NULL) { 398 fDeviceManager->put_node(fNode); 399 fNode = NULL; 400 } 401 } 402 403 return foundNode; 404 } 405 406 private: 407 device_manager_info *fDeviceManager; 408 device_node *fNode; 409 device_node *fParent; 410 }; 411 412 413 static void 414 get_interrupt_controller_modules(PICModuleList &list) 415 { 416 const char *namePrefix = "interrupt_controllers/"; 417 size_t namePrefixLen = strlen(namePrefix); 418 419 char name[B_PATH_NAME_LENGTH]; 420 size_t length; 421 uint32 cookie = 0; 422 while (get_next_loaded_module_name(&cookie, name, &(length = sizeof(name))) 423 == B_OK) { 424 // an interrupt controller module? 425 if (length <= namePrefixLen 426 || strncmp(name, namePrefix, namePrefixLen) != 0) { 427 continue; 428 } 429 430 // get the module 431 interrupt_controller_module_info *moduleInfo; 432 if (get_module(name, (module_info**)&moduleInfo) != B_OK) 433 continue; 434 435 // add it to the list 436 PICModule *module = new(nothrow) PICModule(moduleInfo); 437 if (!module) { 438 put_module(((module_info*)moduleInfo)->name); 439 continue; 440 } 441 list.Add(module); 442 } 443 } 444 445 446 static bool 447 probe_pic_device(device_node *node, PICModuleList &picModules) 448 { 449 for (PICModule *module = picModules.Head(); 450 module; 451 module = picModules.GetNext(module)) { 452 //bool noConnection; 453 if (module->module->info.supports_device(node) > 0) { 454 if (module->module->info.register_device(node) == B_OK) 455 return true; 456 } 457 } 458 459 return false; 460 } 461 462 463 status_t 464 arch_int_init_post_device_manager(struct kernel_args *args) 465 { 466 // get the interrupt controller driver modules 467 PICModuleList picModules; 468 get_interrupt_controller_modules(picModules); 469 if (picModules.IsEmpty()) { 470 panic("arch_int_init_post_device_manager(): Found no PIC modules!"); 471 return B_ENTRY_NOT_FOUND; 472 } 473 474 // get the device manager module 475 device_manager_info *deviceManager; 476 status_t error = get_module(B_DEVICE_MANAGER_MODULE_NAME, 477 (module_info**)&deviceManager); 478 if (error != B_OK) { 479 panic("arch_int_init_post_device_manager(): Failed to get device " 480 "manager: %s", strerror(error)); 481 return error; 482 } 483 Module<device_manager_info> _deviceManager(deviceManager); // auto put 484 485 // iterate through the device tree and probe the interrupt controllers 486 DeviceTreeIterator iterator(deviceManager); 487 while (device_node *node = iterator.Next()) 488 probe_pic_device(node, picModules); 489 490 // iterate through the tree again and get an interrupt controller node 491 iterator.Rewind(); 492 while (device_node *node = iterator.Next()) { 493 const char *deviceType; 494 if (deviceManager->get_attr_string(node, B_DEVICE_TYPE, 495 &deviceType, false) == B_OK) { 496 bool isPIC = false; 497 498 /* 499 bool isPIC 500 = (strcmp(deviceType, B_INTERRUPT_CONTROLLER_DRIVER_TYPE) == 0); 501 free(deviceType); 502 */ 503 504 if (isPIC) { 505 driver_module_info *driver; 506 void *driverCookie; 507 508 deviceManager->get_driver(node, (driver_module_info **)&driver, (void **)&driverCookie); 509 510 sPIC = (interrupt_controller_module_info *)driver; 511 sPICCookie = driverCookie; 512 return B_OK; 513 } 514 } 515 } 516 517 // no PIC found 518 panic("arch_int_init_post_device_manager(): Found no supported PIC!"); 519 520 return B_ENTRY_NOT_FOUND; 521 } 522 523 524 // #pragma mark - 525 526 struct ppc_cpu_exception_context * 527 ppc_get_cpu_exception_context(int cpu) 528 { 529 return sCPUExceptionContexts + cpu; 530 } 531 532 533 void 534 ppc_set_current_cpu_exception_context(struct ppc_cpu_exception_context *context) 535 { 536 // translate to physical address 537 addr_t physicalPage; 538 addr_t inPageOffset = (addr_t)context & (B_PAGE_SIZE - 1); 539 status_t error = vm_get_page_mapping(vm_kernel_address_space_id(), 540 (addr_t)context - inPageOffset, &physicalPage); 541 if (error != B_OK) { 542 panic("ppc_set_current_cpu_exception_context(): Failed to get physical " 543 "address!"); 544 return; 545 } 546 547 asm volatile("mtsprg0 %0" : : "r"(physicalPage + inPageOffset)); 548 } 549 550