1 /* 2 * Copyright 2003-2011, 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 * François Revol <revol@free.fr> 9 * 10 * Copyright 2001, Travis Geiselbrecht. All rights reserved. 11 * Distributed under the terms of the NewOS License. 12 */ 13 14 15 #include <int.h> 16 17 #include <arch_platform.h> 18 #include <arch/smp.h> 19 #include <boot/kernel_args.h> 20 #include <device_manager.h> 21 #include <kscheduler.h> 22 #include <interrupt_controller.h> 23 #include <smp.h> 24 #include <thread.h> 25 #include <timer.h> 26 #include <util/AutoLock.h> 27 #include <util/DoublyLinkedList.h> 28 #include <util/kernel_cpp.h> 29 #include <vm/vm.h> 30 #include <vm/vm_priv.h> 31 #include <vm/VMAddressSpace.h> 32 #include <string.h> 33 34 #warning M68K: writeme! 35 36 37 //#define TRACE_ARCH_INT 38 #ifdef TRACE_ARCH_INT 39 # define TRACE(x) dprintf x 40 #else 41 # define TRACE(x) ; 42 #endif 43 44 typedef void (*m68k_exception_handler)(void); 45 #define M68K_EXCEPTION_VECTOR_COUNT 256 46 #warning M68K: align on 4 ? 47 //m68k_exception_handler gExceptionVectors[M68K_EXCEPTION_VECTOR_COUNT]; 48 m68k_exception_handler *gExceptionVectors; 49 50 // defined in arch_exceptions.S 51 extern "C" void __m68k_exception_noop(void); 52 extern "C" void __m68k_exception_common(void); 53 54 extern int __irqvec_start; 55 extern int __irqvec_end; 56 57 extern"C" void m68k_exception_tail(void); 58 59 // current fault handler 60 addr_t gFaultHandler; 61 62 // An iframe stack used in the early boot process when we don't have 63 // threads yet. 64 struct iframe_stack gBootFrameStack; 65 66 // interrupt controller interface (initialized 67 // in arch_int_init_post_device_manager()) 68 //static struct interrupt_controller_module_info *sPIC; 69 //static void *sPICCookie; 70 71 72 void 73 arch_int_enable_io_interrupt(int irq) 74 { 75 //if (!sPIC) 76 // return; 77 78 // TODO: I have no idea, what IRQ type is appropriate. 79 //sPIC->enable_io_interrupt(sPICCookie, irq, IRQ_TYPE_LEVEL); 80 M68KPlatform::Default()->EnableIOInterrupt(irq); 81 } 82 83 84 void 85 arch_int_disable_io_interrupt(int irq) 86 { 87 //if (!sPIC) 88 // return; 89 90 //sPIC->disable_io_interrupt(sPICCookie, irq); 91 M68KPlatform::Default()->DisableIOInterrupt(irq); 92 } 93 94 95 /* arch_int_*_interrupts() and friends are in arch_asm.S */ 96 97 98 static void 99 print_iframe(struct iframe *frame) 100 { 101 dprintf("iframe at %p:\n", frame); 102 dprintf(" d0 0x%08lx d1 0x%08lx d2 0x%08lx d3 0x%08lx\n", 103 frame->d[0], frame->d[1], frame->d[2], frame->d[3]); 104 kprintf(" d4 0x%08lx d5 0x%08lx d6 0x%08lx d7 0x%08lx\n", 105 frame->d[4], frame->d[5], frame->d[6], frame->d[7]); 106 kprintf(" a0 0x%08lx a1 0x%08lx a2 0x%08lx a3 0x%08lx\n", 107 frame->a[0], frame->a[1], frame->a[2], frame->a[3]); 108 kprintf(" a4 0x%08lx a5 0x%08lx a6 0x%08lx "/*"a7 0x%08lx (sp)"*/"\n", 109 frame->a[4], frame->a[5], frame->a[6]/*, frame->a[7]*/); 110 111 /*kprintf(" pc 0x%08lx ccr 0x%02x\n", 112 frame->pc, frame->ccr);*/ 113 kprintf(" pc 0x%08lx sr 0x%04x\n", 114 frame->cpu.pc, frame->cpu.sr); 115 #if 0 116 dprintf("r0-r3: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->d0, frame->d1, frame->d2, frame->d3); 117 dprintf("r4-r7: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->d4, frame->d5, frame->d6, frame->d7); 118 dprintf("r8-r11: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->a0, frame->a1, frame->a2, frame->a3); 119 dprintf("r12-r15: 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n", frame->a4, frame->a5, frame->a6, frame->a7); 120 dprintf(" pc 0x%08lx sr 0x%08lx\n", frame->pc, frame->sr); 121 #endif 122 } 123 124 125 static addr_t 126 fault_address(struct iframe *iframe) 127 { 128 switch (iframe->cpu.type) { 129 case 0x0: 130 case 0x1: 131 return 0; 132 case 0x2: 133 return iframe->cpu.type_2.instruction_address; 134 case 0x3: 135 return iframe->cpu.type_3.effective_address; 136 case 0x7: 137 return iframe->cpu.type_7.effective_address; 138 case 0x9: 139 return iframe->cpu.type_9.instruction_address; 140 case 0xa: 141 return iframe->cpu.type_a.fault_address; 142 case 0xb: 143 return iframe->cpu.type_b.fault_address; 144 default: 145 return 0; 146 } 147 } 148 149 150 static bool 151 fault_was_write(struct iframe *iframe) 152 { 153 switch (iframe->cpu.type) { 154 case 0x7: 155 return !iframe->cpu.type_7.ssw.rw; 156 case 0xa: 157 return !iframe->cpu.type_a.ssw.rw; 158 case 0xb: 159 return !iframe->cpu.type_b.ssw.rw; 160 default: 161 panic("can't determine r/w from iframe type %d\n", 162 iframe->cpu.type); 163 return false; 164 } 165 } 166 167 168 extern "C" void m68k_exception_entry(struct iframe *iframe); 169 void 170 m68k_exception_entry(struct iframe *iframe) 171 { 172 int vector = iframe->cpu.vector >> 2; 173 bool hardwareInterrupt = false; 174 175 if (vector != -1) { 176 dprintf("m68k_exception_entry: time %lld vector 0x%x, iframe %p, " 177 "pc: %p\n", system_time(), vector, iframe, (void*)iframe->cpu.pc); 178 } 179 180 Thread *thread = thread_get_current_thread(); 181 182 // push iframe 183 if (thread) 184 m68k_push_iframe(&thread->arch_info.iframes, iframe); 185 else 186 m68k_push_iframe(&gBootFrameStack, iframe); 187 188 switch (vector) { 189 case 0: // system reset 190 panic("system reset exception\n"); 191 break; 192 case 2: // bus error 193 case 3: // address error 194 { 195 bool kernelDebugger = debug_debugger_running(); 196 197 if (kernelDebugger) { 198 // if this thread has a fault handler, we're allowed to be here 199 if (thread && thread->fault_handler != 0) { 200 iframe->cpu.pc = thread->fault_handler; 201 break; 202 } 203 204 205 // otherwise, not really 206 panic("page fault in debugger without fault handler! Touching " 207 "address %p from ip %p\n", (void *)fault_address(iframe), 208 (void *)iframe->cpu.pc); 209 break; 210 } else if ((iframe->cpu.sr & SR_IP_MASK) != 0) { 211 // interrupts disabled 212 213 // If a page fault handler is installed, we're allowed to be here. 214 // TODO: Now we are generally allowing user_memcpy() with interrupts 215 // disabled, which in most cases is a bug. We should add some thread 216 // flag allowing to explicitly indicate that this handling is desired. 217 if (thread && thread->fault_handler != 0) { 218 iframe->cpu.pc = thread->fault_handler; 219 return; 220 } 221 222 // if the interrupts were disabled, and we are not running the 223 // kernel startup the page fault was not allowed to happen and 224 // we must panic 225 panic("page fault, but interrupts were disabled. Touching " 226 "address %p from ip %p\n", (void *)fault_address(iframe), 227 (void *)iframe->cpu.pc); 228 break; 229 } else if (thread != NULL && thread->page_faults_allowed < 1) { 230 panic("page fault not allowed at this place. Touching address " 231 "%p from ip %p\n", (void *)fault_address(iframe), 232 (void *)iframe->cpu.pc); 233 } 234 235 enable_interrupts(); 236 237 addr_t newip; 238 239 vm_page_fault(fault_address(iframe), iframe->cpu.pc, 240 fault_was_write(iframe), // store or load 241 iframe->cpu.sr & SR_S, // was the system in user or supervisor 242 &newip); 243 if (newip != 0) { 244 // the page fault handler wants us to modify the iframe to set the 245 // IP the cpu will return to to be this ip 246 iframe->cpu.pc = newip; 247 } 248 break; 249 } 250 251 case 24: // spurious interrupt 252 dprintf("spurious interrupt\n"); 253 break; 254 case 25: // autovector interrupt 255 case 26: // autovector interrupt 256 case 27: // autovector interrupt 257 case 28: // autovector interrupt 258 case 29: // autovector interrupt 259 case 30: // autovector interrupt 260 case 31: // autovector interrupt 261 { 262 #if 0 263 if (!sPIC) { 264 panic("m68k_exception_entry(): external interrupt although we " 265 "don't have a PIC driver!"); 266 break; 267 } 268 #endif 269 M68KPlatform::Default()->AcknowledgeIOInterrupt(vector); 270 271 dprintf("handling I/O interrupts...\n"); 272 int_io_interrupt_handler(vector, true); 273 #if 0 274 while ((irq = sPIC->acknowledge_io_interrupt(sPICCookie)) >= 0) { 275 // TODO: correctly pass level-triggered vs. edge-triggered to the handler! 276 int_io_interrupt_handler(irq, true); 277 } 278 #endif 279 dprintf("handling I/O interrupts done\n"); 280 hardwareInterrupt = true; 281 break; 282 } 283 284 case 9: // trace 285 default: 286 // vectors >= 64 are user defined vectors, used for IRQ 287 if (vector >= 64) { 288 if (M68KPlatform::Default()->AcknowledgeIOInterrupt(vector)) { 289 int_io_interrupt_handler(vector, true); 290 break; 291 } 292 } 293 dprintf("unhandled exception type 0x%x\n", vector); 294 print_iframe(iframe); 295 panic("unhandled exception type\n"); 296 } 297 298 int state = disable_interrupts(); 299 if (thread->cpu->invoke_scheduler) { 300 SpinLocker schedulerLocker(gSchedulerLock); 301 scheduler_reschedule(); 302 schedulerLocker.Unlock(); 303 restore_interrupts(state); 304 } else if (hardwareInterrupt && thread->post_interrupt_callback != NULL) { 305 void (*callback)(void*) = thread->post_interrupt_callback; 306 void* data = thread->post_interrupt_data; 307 308 thread->post_interrupt_callback = NULL; 309 thread->post_interrupt_data = NULL; 310 311 restore_interrupts(state); 312 313 callback(data); 314 } 315 316 // pop iframe 317 if (thread) 318 m68k_pop_iframe(&thread->arch_info.iframes); 319 else 320 m68k_pop_iframe(&gBootFrameStack); 321 } 322 323 324 status_t 325 arch_int_init(kernel_args *args) 326 { 327 status_t err; 328 addr_t vbr; 329 int i; 330 331 gExceptionVectors = (m68k_exception_handler *)args->arch_args.vir_vbr; 332 333 /* fill in the vector table */ 334 for (i = 0; i < M68K_EXCEPTION_VECTOR_COUNT; i++) 335 gExceptionVectors[i] = &__m68k_exception_common; 336 337 vbr = args->arch_args.phys_vbr; 338 /* point VBR to the new table */ 339 asm volatile ("movec %0,%%vbr" : : "r"(vbr):); 340 341 return B_OK; 342 } 343 344 345 status_t 346 arch_int_init_post_vm(kernel_args *args) 347 { 348 status_t err; 349 err = M68KPlatform::Default()->InitPIC(args); 350 return err; 351 } 352 353 354 status_t 355 arch_int_init_io(kernel_args* args) 356 { 357 return B_OK; 358 } 359 360 361 #if 0 /* PIC modules */ 362 template<typename ModuleInfo> 363 struct Module : DoublyLinkedListLinkImpl<Module<ModuleInfo> > { 364 Module(ModuleInfo *module) 365 : module(module) 366 { 367 } 368 369 ~Module() 370 { 371 if (module) 372 put_module(((module_info*)module)->name); 373 } 374 375 ModuleInfo *module; 376 }; 377 378 typedef Module<interrupt_controller_module_info> PICModule; 379 380 struct PICModuleList : DoublyLinkedList<PICModule> { 381 ~PICModuleList() 382 { 383 while (PICModule *module = First()) { 384 Remove(module); 385 delete module; 386 } 387 } 388 }; 389 390 391 class DeviceTreeIterator { 392 public: 393 DeviceTreeIterator(device_manager_info *deviceManager) 394 : fDeviceManager(deviceManager), 395 fNode(NULL), 396 fParent(NULL) 397 { 398 Rewind(); 399 } 400 401 ~DeviceTreeIterator() 402 { 403 if (fParent != NULL) 404 fDeviceManager->put_device_node(fParent); 405 if (fNode != NULL) 406 fDeviceManager->put_device_node(fNode); 407 } 408 409 void Rewind() 410 { 411 fNode = fDeviceManager->get_root(); 412 } 413 414 bool HasNext() const 415 { 416 return (fNode != NULL); 417 } 418 419 device_node_handle Next() 420 { 421 if (fNode == NULL) 422 return NULL; 423 424 device_node_handle foundNode = fNode; 425 426 // get first child 427 device_node_handle child = NULL; 428 if (fDeviceManager->get_next_child_device(fNode, &child, NULL) 429 == B_OK) { 430 // move to the child node 431 if (fParent != NULL) 432 fDeviceManager->put_device_node(fParent); 433 fParent = fNode; 434 fNode = child; 435 436 // no more children; backtrack to find the next sibling 437 } else { 438 while (fParent != NULL) { 439 if (fDeviceManager->get_next_child_device(fParent, &fNode, NULL) 440 == B_OK) { 441 // get_next_child_device() always puts the node 442 break; 443 } 444 fNode = fParent; 445 fParent = fDeviceManager->get_parent(fNode); 446 } 447 448 // if we hit the root node again, we're done 449 if (fParent == NULL) { 450 fDeviceManager->put_device_node(fNode); 451 fNode = NULL; 452 } 453 } 454 455 return foundNode; 456 } 457 458 private: 459 device_manager_info *fDeviceManager; 460 device_node_handle fNode; 461 device_node_handle fParent; 462 }; 463 464 465 static void 466 get_interrupt_controller_modules(PICModuleList &list) 467 { 468 const char *namePrefix = "interrupt_controllers/"; 469 size_t namePrefixLen = strlen(namePrefix); 470 471 char name[B_PATH_NAME_LENGTH]; 472 size_t length; 473 uint32 cookie = 0; 474 while (get_next_loaded_module_name(&cookie, name, &(length = sizeof(name))) 475 == B_OK) { 476 // an interrupt controller module? 477 if (length <= namePrefixLen 478 || strncmp(name, namePrefix, namePrefixLen) != 0) { 479 continue; 480 } 481 482 // get the module 483 interrupt_controller_module_info *moduleInfo; 484 if (get_module(name, (module_info**)&moduleInfo) != B_OK) 485 continue; 486 487 // add it to the list 488 PICModule *module = new(nothrow) PICModule(moduleInfo); 489 if (!module) { 490 put_module(((module_info*)moduleInfo)->name); 491 continue; 492 } 493 list.Add(module); 494 } 495 } 496 497 498 static bool 499 probe_pic_device(device_node_handle node, PICModuleList &picModules) 500 { 501 for (PICModule *module = picModules.Head(); 502 module; 503 module = picModules.GetNext(module)) { 504 bool noConnection; 505 if (module->module->info.supports_device(node, &noConnection) > 0) { 506 if (module->module->info.register_device(node) == B_OK) 507 return true; 508 } 509 } 510 511 return false; 512 } 513 #endif /* PIC modules */ 514 515 status_t 516 arch_int_init_post_device_manager(struct kernel_args *args) 517 { 518 #if 0 /* PIC modules */ 519 // get the interrupt controller driver modules 520 PICModuleList picModules; 521 get_interrupt_controller_modules(picModules); 522 if (picModules.IsEmpty()) { 523 panic("arch_int_init_post_device_manager(): Found no PIC modules!"); 524 return B_ENTRY_NOT_FOUND; 525 } 526 527 // get the device manager module 528 device_manager_info *deviceManager; 529 status_t error = get_module(B_DEVICE_MANAGER_MODULE_NAME, 530 (module_info**)&deviceManager); 531 if (error != B_OK) { 532 panic("arch_int_init_post_device_manager(): Failed to get device " 533 "manager: %s", strerror(error)); 534 return error; 535 } 536 Module<device_manager_info> _deviceManager(deviceManager); // auto put 537 538 // iterate through the device tree and probe the interrupt controllers 539 DeviceTreeIterator iterator(deviceManager); 540 while (device_node_handle node = iterator.Next()) 541 probe_pic_device(node, picModules); 542 543 // iterate through the tree again and get an interrupt controller node 544 iterator.Rewind(); 545 while (device_node_handle node = iterator.Next()) { 546 char *deviceType; 547 if (deviceManager->get_attr_string(node, B_DRIVER_DEVICE_TYPE, 548 &deviceType, false) == B_OK) { 549 bool isPIC 550 = (strcmp(deviceType, B_INTERRUPT_CONTROLLER_DRIVER_TYPE) == 0); 551 free(deviceType); 552 553 if (isPIC) { 554 driver_module_info *driver; 555 void *driverCookie; 556 error = deviceManager->init_driver(node, NULL, &driver, 557 &driverCookie); 558 if (error == B_OK) { 559 sPIC = (interrupt_controller_module_info *)driver; 560 sPICCookie = driverCookie; 561 return B_OK; 562 } 563 } 564 } 565 } 566 567 #endif /* PIC modules */ 568 569 // no PIC found 570 panic("arch_int_init_post_device_manager(): Found no supported PIC!"); 571 572 return B_ENTRY_NOT_FOUND; 573 } 574 575 576 #if 0//PPC 577 // #pragma mark - 578 579 struct m68k_cpu_exception_context * 580 m68k_get_cpu_exception_context(int cpu) 581 { 582 return sCPUExceptionContexts + cpu; 583 } 584 585 586 void 587 m68k_set_current_cpu_exception_context(struct m68k_cpu_exception_context *context) 588 { 589 // translate to physical address 590 addr_t physicalPage; 591 addr_t inPageOffset = (addr_t)context & (B_PAGE_SIZE - 1); 592 status_t error = vm_get_page_mapping(VMAddressSpace::KernelID(), 593 (addr_t)context - inPageOffset, &physicalPage); 594 if (error != B_OK) { 595 panic("m68k_set_current_cpu_exception_context(): Failed to get physical " 596 "address!"); 597 return; 598 } 599 600 asm volatile("mtsprg0 %0" : : "r"(physicalPage + inPageOffset)); 601 } 602 603 #endif 604