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 * François Revol <revol@free.fr> 9 * Distributed under the terms of the MIT License. 10 * 11 * 12 * Copyright 2001, Travis Geiselbrecht. All rights reserved. 13 * Distributed under the terms of the NewOS License. 14 */ 15 16 #include <int.h> 17 18 #include <arch_platform.h> 19 #include <arch/smp.h> 20 #include <boot/kernel_args.h> 21 #include <device_manager.h> 22 #include <kscheduler.h> 23 #include <interrupt_controller.h> 24 #include <smp.h> 25 #include <thread.h> 26 #include <timer.h> 27 #include <util/DoublyLinkedList.h> 28 #include <util/kernel_cpp.h> 29 #include <vm.h> 30 #include <vm_address_space.h> 31 #include <vm_priv.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 static addr_t 125 fault_address(struct iframe *iframe) 126 { 127 switch (iframe->cpu.type) { 128 case 0x0: 129 case 0x1: 130 return 0; 131 case 0x2: 132 return iframe->cpu.type_2.instruction_address; 133 case 0x3: 134 return iframe->cpu.type_3.effective_address; 135 case 0x7: 136 return iframe->cpu.type_7.effective_address; 137 case 0x9: 138 return iframe->cpu.type_9.instruction_address; 139 case 0xa: 140 return iframe->cpu.type_a.fault_address; 141 case 0xb: 142 return iframe->cpu.type_b.fault_address; 143 default: 144 return 0; 145 } 146 } 147 148 static bool 149 fault_was_write(struct iframe *iframe) 150 { 151 switch (iframe->cpu.type) { 152 case 0x7: 153 return !iframe->cpu.type_7.ssw.rw; 154 case 0xa: 155 return !iframe->cpu.type_a.ssw.rw; 156 case 0xb: 157 return !iframe->cpu.type_b.ssw.rw; 158 default: 159 panic("can't determine r/w from iframe type %d\n", 160 iframe->cpu.type); 161 return false; 162 } 163 } 164 165 extern "C" void m68k_exception_entry(struct iframe *iframe); 166 void 167 m68k_exception_entry(struct iframe *iframe) 168 { 169 int vector = iframe->cpu.vector >> 2; 170 int ret = B_HANDLED_INTERRUPT; 171 172 if (vector != -1) { 173 dprintf("m68k_exception_entry: time %lld vector 0x%x, iframe %p, " 174 "pc: %p\n", system_time(), vector, iframe, (void*)iframe->cpu.pc); 175 } 176 177 struct thread *thread = thread_get_current_thread(); 178 179 // push iframe 180 if (thread) 181 m68k_push_iframe(&thread->arch_info.iframes, iframe); 182 else 183 m68k_push_iframe(&gBootFrameStack, iframe); 184 185 switch (vector) { 186 case 0: // system reset 187 panic("system reset exception\n"); 188 break; 189 case 2: // bus error 190 case 3: // address error 191 { 192 bool kernelDebugger = debug_debugger_running(); 193 194 if (kernelDebugger) { 195 // if this thread has a fault handler, we're allowed to be here 196 struct thread *thread = thread_get_current_thread(); 197 if (thread && thread->fault_handler != 0) { 198 iframe->cpu.pc = thread->fault_handler; 199 break; 200 } 201 202 203 // otherwise, not really 204 panic("page fault in debugger without fault handler! Touching " 205 "address %p from ip %p\n", (void *)fault_address(iframe), 206 (void *)iframe->cpu.pc); 207 break; 208 } else if ((iframe->cpu.sr & SR_IP_MASK) != 0) { 209 // if the interrupts were disabled, and we are not running the 210 // kernel startup the page fault was not allowed to happen and 211 // we must panic 212 panic("page fault, but interrupts were disabled. Touching " 213 "address %p from ip %p\n", (void *)fault_address(iframe), 214 (void *)iframe->cpu.pc); 215 break; 216 } else if (thread != NULL && thread->page_faults_allowed < 1) { 217 panic("page fault not allowed at this place. Touching address " 218 "%p from ip %p\n", (void *)fault_address(iframe), 219 (void *)iframe->cpu.pc); 220 } 221 222 enable_interrupts(); 223 224 addr_t newip; 225 226 ret = vm_page_fault(fault_address(iframe), iframe->cpu.pc, 227 fault_was_write(iframe), // store or load 228 iframe->cpu.sr & SR_S, // was the system in user or supervisor 229 &newip); 230 if (newip != 0) { 231 // the page fault handler wants us to modify the iframe to set the 232 // IP the cpu will return to to be this ip 233 iframe->cpu.pc = newip; 234 } 235 break; 236 } 237 238 case 24: // spurious interrupt 239 dprintf("spurious interrupt\n"); 240 break; 241 case 25: // autovector interrupt 242 case 26: // autovector interrupt 243 case 27: // autovector interrupt 244 case 28: // autovector interrupt 245 case 29: // autovector interrupt 246 case 30: // autovector interrupt 247 case 31: // autovector interrupt 248 { 249 #if 0 250 if (!sPIC) { 251 panic("m68k_exception_entry(): external interrupt although we " 252 "don't have a PIC driver!"); 253 ret = B_HANDLED_INTERRUPT; 254 break; 255 } 256 #endif 257 M68KPlatform::Default()->AcknowledgeIOInterrupt(vector); 258 259 dprintf("handling I/O interrupts...\n"); 260 ret = int_io_interrupt_handler(vector, true); 261 #if 0 262 while ((irq = sPIC->acknowledge_io_interrupt(sPICCookie)) >= 0) { 263 // TODO: correctly pass level-triggered vs. edge-triggered to the handler! 264 ret = int_io_interrupt_handler(irq, true); 265 } 266 #endif 267 dprintf("handling I/O interrupts done\n"); 268 break; 269 } 270 271 case 9: // trace 272 default: 273 // vectors >= 64 are user defined vectors, used for IRQ 274 if (vector >= 64) { 275 M68KPlatform::Default()->AcknowledgeIOInterrupt(irq); 276 ret = int_io_interrupt_handler(vector, true); 277 break; 278 } 279 dprintf("unhandled exception type 0x%x\n", vector); 280 print_iframe(iframe); 281 panic("unhandled exception type\n"); 282 } 283 284 if (ret == B_INVOKE_SCHEDULER) { 285 int state = disable_interrupts(); 286 GRAB_THREAD_LOCK(); 287 scheduler_reschedule(); 288 RELEASE_THREAD_LOCK(); 289 restore_interrupts(state); 290 } 291 292 // pop iframe 293 if (thread) 294 m68k_pop_iframe(&thread->arch_info.iframes); 295 else 296 m68k_pop_iframe(&gBootFrameStack); 297 } 298 299 300 status_t 301 arch_int_init(kernel_args *args) 302 { 303 status_t err; 304 addr_t vbr; 305 int i; 306 307 gExceptionVectors = (m68k_exception_handler *)args->arch_args.vir_vbr; 308 309 /* fill in the vector table */ 310 for (i = 0; i < M68K_EXCEPTION_VECTOR_COUNT; i++) 311 gExceptionVectors[i] = &__m68k_exception_common; 312 313 vbr = args->arch_args.phys_vbr; 314 /* point VBR to the new table */ 315 asm volatile ("movec %0,%%vbr" : : "r"(vbr):); 316 return B_OK; 317 } 318 319 320 status_t 321 arch_int_init_post_vm(kernel_args *args) 322 { 323 return B_OK; 324 } 325 326 327 #if 0 /* PIC modules */ 328 template<typename ModuleInfo> 329 struct Module : DoublyLinkedListLinkImpl<Module<ModuleInfo> > { 330 Module(ModuleInfo *module) 331 : module(module) 332 { 333 } 334 335 ~Module() 336 { 337 if (module) 338 put_module(((module_info*)module)->name); 339 } 340 341 ModuleInfo *module; 342 }; 343 344 typedef Module<interrupt_controller_module_info> PICModule; 345 346 struct PICModuleList : DoublyLinkedList<PICModule> { 347 ~PICModuleList() 348 { 349 while (PICModule *module = First()) { 350 Remove(module); 351 delete module; 352 } 353 } 354 }; 355 356 357 class DeviceTreeIterator { 358 public: 359 DeviceTreeIterator(device_manager_info *deviceManager) 360 : fDeviceManager(deviceManager), 361 fNode(NULL), 362 fParent(NULL) 363 { 364 Rewind(); 365 } 366 367 ~DeviceTreeIterator() 368 { 369 if (fParent != NULL) 370 fDeviceManager->put_device_node(fParent); 371 if (fNode != NULL) 372 fDeviceManager->put_device_node(fNode); 373 } 374 375 void Rewind() 376 { 377 fNode = fDeviceManager->get_root(); 378 } 379 380 bool HasNext() const 381 { 382 return (fNode != NULL); 383 } 384 385 device_node_handle Next() 386 { 387 if (fNode == NULL) 388 return NULL; 389 390 device_node_handle foundNode = fNode; 391 392 // get first child 393 device_node_handle child = NULL; 394 if (fDeviceManager->get_next_child_device(fNode, &child, NULL) 395 == B_OK) { 396 // move to the child node 397 if (fParent != NULL) 398 fDeviceManager->put_device_node(fParent); 399 fParent = fNode; 400 fNode = child; 401 402 // no more children; backtrack to find the next sibling 403 } else { 404 while (fParent != NULL) { 405 if (fDeviceManager->get_next_child_device(fParent, &fNode, NULL) 406 == B_OK) { 407 // get_next_child_device() always puts the node 408 break; 409 } 410 fNode = fParent; 411 fParent = fDeviceManager->get_parent(fNode); 412 } 413 414 // if we hit the root node again, we're done 415 if (fParent == NULL) { 416 fDeviceManager->put_device_node(fNode); 417 fNode = NULL; 418 } 419 } 420 421 return foundNode; 422 } 423 424 private: 425 device_manager_info *fDeviceManager; 426 device_node_handle fNode; 427 device_node_handle fParent; 428 }; 429 430 431 static void 432 get_interrupt_controller_modules(PICModuleList &list) 433 { 434 const char *namePrefix = "interrupt_controllers/"; 435 size_t namePrefixLen = strlen(namePrefix); 436 437 char name[B_PATH_NAME_LENGTH]; 438 size_t length; 439 uint32 cookie = 0; 440 while (get_next_loaded_module_name(&cookie, name, &(length = sizeof(name))) 441 == B_OK) { 442 // an interrupt controller module? 443 if (length <= namePrefixLen 444 || strncmp(name, namePrefix, namePrefixLen) != 0) { 445 continue; 446 } 447 448 // get the module 449 interrupt_controller_module_info *moduleInfo; 450 if (get_module(name, (module_info**)&moduleInfo) != B_OK) 451 continue; 452 453 // add it to the list 454 PICModule *module = new(nothrow) PICModule(moduleInfo); 455 if (!module) { 456 put_module(((module_info*)moduleInfo)->name); 457 continue; 458 } 459 list.Add(module); 460 } 461 } 462 463 464 static bool 465 probe_pic_device(device_node_handle node, PICModuleList &picModules) 466 { 467 for (PICModule *module = picModules.Head(); 468 module; 469 module = picModules.GetNext(module)) { 470 bool noConnection; 471 if (module->module->info.supports_device(node, &noConnection) > 0) { 472 if (module->module->info.register_device(node) == B_OK) 473 return true; 474 } 475 } 476 477 return false; 478 } 479 #endif /* PIC modules */ 480 481 status_t 482 arch_int_init_post_device_manager(struct kernel_args *args) 483 { 484 status_t err; 485 err = M68KPlatform::Default()->InitPIC(args); 486 return err; 487 #if 0 /* PIC modules */ 488 // get the interrupt controller driver modules 489 PICModuleList picModules; 490 get_interrupt_controller_modules(picModules); 491 if (picModules.IsEmpty()) { 492 panic("arch_int_init_post_device_manager(): Found no PIC modules!"); 493 return B_ENTRY_NOT_FOUND; 494 } 495 496 // get the device manager module 497 device_manager_info *deviceManager; 498 status_t error = get_module(B_DEVICE_MANAGER_MODULE_NAME, 499 (module_info**)&deviceManager); 500 if (error != B_OK) { 501 panic("arch_int_init_post_device_manager(): Failed to get device " 502 "manager: %s", strerror(error)); 503 return error; 504 } 505 Module<device_manager_info> _deviceManager(deviceManager); // auto put 506 507 // iterate through the device tree and probe the interrupt controllers 508 DeviceTreeIterator iterator(deviceManager); 509 while (device_node_handle node = iterator.Next()) 510 probe_pic_device(node, picModules); 511 512 // iterate through the tree again and get an interrupt controller node 513 iterator.Rewind(); 514 while (device_node_handle node = iterator.Next()) { 515 char *deviceType; 516 if (deviceManager->get_attr_string(node, B_DRIVER_DEVICE_TYPE, 517 &deviceType, false) == B_OK) { 518 bool isPIC 519 = (strcmp(deviceType, B_INTERRUPT_CONTROLLER_DRIVER_TYPE) == 0); 520 free(deviceType); 521 522 if (isPIC) { 523 driver_module_info *driver; 524 void *driverCookie; 525 error = deviceManager->init_driver(node, NULL, &driver, 526 &driverCookie); 527 if (error == B_OK) { 528 sPIC = (interrupt_controller_module_info *)driver; 529 sPICCookie = driverCookie; 530 return B_OK; 531 } 532 } 533 } 534 } 535 536 #endif /* PIC modules */ 537 538 // no PIC found 539 panic("arch_int_init_post_device_manager(): Found no supported PIC!"); 540 541 return B_ENTRY_NOT_FOUND; 542 } 543 544 545 #if 0//PPC 546 // #pragma mark - 547 548 struct m68k_cpu_exception_context * 549 m68k_get_cpu_exception_context(int cpu) 550 { 551 return sCPUExceptionContexts + cpu; 552 } 553 554 555 void 556 m68k_set_current_cpu_exception_context(struct m68k_cpu_exception_context *context) 557 { 558 // translate to physical address 559 addr_t physicalPage; 560 addr_t inPageOffset = (addr_t)context & (B_PAGE_SIZE - 1); 561 status_t error = vm_get_page_mapping(vm_kernel_address_space_id(), 562 (addr_t)context - inPageOffset, &physicalPage); 563 if (error != B_OK) { 564 panic("m68k_set_current_cpu_exception_context(): Failed to get physical " 565 "address!"); 566 return; 567 } 568 569 asm volatile("mtsprg0 %0" : : "r"(physicalPage + inPageOffset)); 570 } 571 572 #endif 573