1 /* 2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $) 3 * 4 * Copyright (C) 2000 Andrew Henroid 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * 8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 25 * 26 */ 27 28 #include <linux/module.h> 29 #include <linux/kernel.h> 30 #include <linux/slab.h> 31 #include <linux/mm.h> 32 #include <linux/pci.h> 33 #include <linux/smp_lock.h> 34 #include <linux/interrupt.h> 35 #include <linux/kmod.h> 36 #include <linux/delay.h> 37 #include <linux/workqueue.h> 38 #include <linux/nmi.h> 39 #include <linux/acpi.h> 40 #include <acpi/acpi.h> 41 #include <asm/io.h> 42 #include <acpi/acpi_bus.h> 43 #include <acpi/processor.h> 44 #include <asm/uaccess.h> 45 46 #include <linux/efi.h> 47 48 #define _COMPONENT ACPI_OS_SERVICES 49 ACPI_MODULE_NAME("osl") 50 #define PREFIX "ACPI: " 51 struct acpi_os_dpc { 52 acpi_osd_exec_callback function; 53 void *context; 54 struct work_struct work; 55 }; 56 57 #ifdef CONFIG_ACPI_CUSTOM_DSDT 58 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 59 #endif 60 61 #ifdef ENABLE_DEBUGGER 62 #include <linux/kdb.h> 63 64 /* stuff for debugger support */ 65 int acpi_in_debugger; 66 EXPORT_SYMBOL(acpi_in_debugger); 67 68 extern char line_buf[80]; 69 #endif /*ENABLE_DEBUGGER */ 70 71 int acpi_specific_hotkey_enabled = TRUE; 72 EXPORT_SYMBOL(acpi_specific_hotkey_enabled); 73 74 static unsigned int acpi_irq_irq; 75 static acpi_osd_handler acpi_irq_handler; 76 static void *acpi_irq_context; 77 static struct workqueue_struct *kacpid_wq; 78 79 static void __init acpi_request_region (struct acpi_generic_address *addr, 80 unsigned int length, char *desc) 81 { 82 struct resource *res; 83 84 if (!addr->address || !length) 85 return; 86 87 if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 88 res = request_region(addr->address, length, desc); 89 else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 90 res = request_mem_region(addr->address, length, desc); 91 } 92 93 static int __init acpi_reserve_resources(void) 94 { 95 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 96 "ACPI PM1a_EVT_BLK"); 97 98 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 99 "ACPI PM1b_EVT_BLK"); 100 101 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 102 "ACPI PM1a_CNT_BLK"); 103 104 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 105 "ACPI PM1b_CNT_BLK"); 106 107 if (acpi_gbl_FADT.pm_timer_length == 4) 108 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 109 110 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 111 "ACPI PM2_CNT_BLK"); 112 113 /* Length of GPE blocks must be a non-negative multiple of 2 */ 114 115 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 116 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 117 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 118 119 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 120 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 121 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 122 123 return 0; 124 } 125 device_initcall(acpi_reserve_resources); 126 127 acpi_status acpi_os_initialize(void) 128 { 129 return AE_OK; 130 } 131 132 acpi_status acpi_os_initialize1(void) 133 { 134 /* 135 * Initialize PCI configuration space access, as we'll need to access 136 * it while walking the namespace (bus 0 and root bridges w/ _BBNs). 137 */ 138 if (!raw_pci_ops) { 139 printk(KERN_ERR PREFIX 140 "Access to PCI configuration space unavailable\n"); 141 return AE_NULL_ENTRY; 142 } 143 kacpid_wq = create_singlethread_workqueue("kacpid"); 144 BUG_ON(!kacpid_wq); 145 146 return AE_OK; 147 } 148 149 acpi_status acpi_os_terminate(void) 150 { 151 if (acpi_irq_handler) { 152 acpi_os_remove_interrupt_handler(acpi_irq_irq, 153 acpi_irq_handler); 154 } 155 156 destroy_workqueue(kacpid_wq); 157 158 return AE_OK; 159 } 160 161 void acpi_os_printf(const char *fmt, ...) 162 { 163 va_list args; 164 va_start(args, fmt); 165 acpi_os_vprintf(fmt, args); 166 va_end(args); 167 } 168 169 EXPORT_SYMBOL(acpi_os_printf); 170 171 void acpi_os_vprintf(const char *fmt, va_list args) 172 { 173 static char buffer[512]; 174 175 vsprintf(buffer, fmt, args); 176 177 #ifdef ENABLE_DEBUGGER 178 if (acpi_in_debugger) { 179 kdb_printf("%s", buffer); 180 } else { 181 printk("%s", buffer); 182 } 183 #else 184 printk("%s", buffer); 185 #endif 186 } 187 188 acpi_physical_address __init acpi_os_get_root_pointer(void) 189 { 190 if (efi_enabled) { 191 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 192 return efi.acpi20; 193 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 194 return efi.acpi; 195 else { 196 printk(KERN_ERR PREFIX 197 "System description tables not found\n"); 198 return 0; 199 } 200 } else 201 return acpi_find_rsdp(); 202 } 203 204 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 205 { 206 if (phys > ULONG_MAX) { 207 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 208 return 0; 209 } 210 if (acpi_gbl_permanent_mmap) 211 /* 212 * ioremap checks to ensure this is in reserved space 213 */ 214 return ioremap((unsigned long)phys, size); 215 else 216 return __acpi_map_table((unsigned long)phys, size); 217 } 218 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 219 220 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size) 221 { 222 if (acpi_gbl_permanent_mmap) { 223 iounmap(virt); 224 } 225 } 226 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 227 228 #ifdef ACPI_FUTURE_USAGE 229 acpi_status 230 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 231 { 232 if (!phys || !virt) 233 return AE_BAD_PARAMETER; 234 235 *phys = virt_to_phys(virt); 236 237 return AE_OK; 238 } 239 #endif 240 241 #define ACPI_MAX_OVERRIDE_LEN 100 242 243 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 244 245 acpi_status 246 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 247 acpi_string * new_val) 248 { 249 if (!init_val || !new_val) 250 return AE_BAD_PARAMETER; 251 252 *new_val = NULL; 253 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 254 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 255 acpi_os_name); 256 *new_val = acpi_os_name; 257 } 258 259 return AE_OK; 260 } 261 262 acpi_status 263 acpi_os_table_override(struct acpi_table_header * existing_table, 264 struct acpi_table_header ** new_table) 265 { 266 if (!existing_table || !new_table) 267 return AE_BAD_PARAMETER; 268 269 #ifdef CONFIG_ACPI_CUSTOM_DSDT 270 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 271 *new_table = (struct acpi_table_header *)AmlCode; 272 else 273 *new_table = NULL; 274 #else 275 *new_table = NULL; 276 #endif 277 return AE_OK; 278 } 279 280 static irqreturn_t acpi_irq(int irq, void *dev_id) 281 { 282 return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE; 283 } 284 285 acpi_status 286 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 287 void *context) 288 { 289 unsigned int irq; 290 291 /* 292 * Ignore the GSI from the core, and use the value in our copy of the 293 * FADT. It may not be the same if an interrupt source override exists 294 * for the SCI. 295 */ 296 gsi = acpi_gbl_FADT.sci_interrupt; 297 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 298 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 299 gsi); 300 return AE_OK; 301 } 302 303 acpi_irq_handler = handler; 304 acpi_irq_context = context; 305 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 306 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 307 return AE_NOT_ACQUIRED; 308 } 309 acpi_irq_irq = irq; 310 311 return AE_OK; 312 } 313 314 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler) 315 { 316 if (irq) { 317 free_irq(irq, acpi_irq); 318 acpi_irq_handler = NULL; 319 acpi_irq_irq = 0; 320 } 321 322 return AE_OK; 323 } 324 325 /* 326 * Running in interpreter thread context, safe to sleep 327 */ 328 329 void acpi_os_sleep(acpi_integer ms) 330 { 331 schedule_timeout_interruptible(msecs_to_jiffies(ms)); 332 } 333 334 EXPORT_SYMBOL(acpi_os_sleep); 335 336 void acpi_os_stall(u32 us) 337 { 338 while (us) { 339 u32 delay = 1000; 340 341 if (delay > us) 342 delay = us; 343 udelay(delay); 344 touch_nmi_watchdog(); 345 us -= delay; 346 } 347 } 348 349 EXPORT_SYMBOL(acpi_os_stall); 350 351 /* 352 * Support ACPI 3.0 AML Timer operand 353 * Returns 64-bit free-running, monotonically increasing timer 354 * with 100ns granularity 355 */ 356 u64 acpi_os_get_timer(void) 357 { 358 static u64 t; 359 360 #ifdef CONFIG_HPET 361 /* TBD: use HPET if available */ 362 #endif 363 364 #ifdef CONFIG_X86_PM_TIMER 365 /* TBD: default to PM timer if HPET was not available */ 366 #endif 367 if (!t) 368 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n"); 369 370 return ++t; 371 } 372 373 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 374 { 375 u32 dummy; 376 377 if (!value) 378 value = &dummy; 379 380 switch (width) { 381 case 8: 382 *(u8 *) value = inb(port); 383 break; 384 case 16: 385 *(u16 *) value = inw(port); 386 break; 387 case 32: 388 *(u32 *) value = inl(port); 389 break; 390 default: 391 BUG(); 392 } 393 394 return AE_OK; 395 } 396 397 EXPORT_SYMBOL(acpi_os_read_port); 398 399 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 400 { 401 switch (width) { 402 case 8: 403 outb(value, port); 404 break; 405 case 16: 406 outw(value, port); 407 break; 408 case 32: 409 outl(value, port); 410 break; 411 default: 412 BUG(); 413 } 414 415 return AE_OK; 416 } 417 418 EXPORT_SYMBOL(acpi_os_write_port); 419 420 acpi_status 421 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) 422 { 423 u32 dummy; 424 void __iomem *virt_addr; 425 426 virt_addr = ioremap(phys_addr, width); 427 if (!value) 428 value = &dummy; 429 430 switch (width) { 431 case 8: 432 *(u8 *) value = readb(virt_addr); 433 break; 434 case 16: 435 *(u16 *) value = readw(virt_addr); 436 break; 437 case 32: 438 *(u32 *) value = readl(virt_addr); 439 break; 440 default: 441 BUG(); 442 } 443 444 iounmap(virt_addr); 445 446 return AE_OK; 447 } 448 449 acpi_status 450 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) 451 { 452 void __iomem *virt_addr; 453 454 virt_addr = ioremap(phys_addr, width); 455 456 switch (width) { 457 case 8: 458 writeb(value, virt_addr); 459 break; 460 case 16: 461 writew(value, virt_addr); 462 break; 463 case 32: 464 writel(value, virt_addr); 465 break; 466 default: 467 BUG(); 468 } 469 470 iounmap(virt_addr); 471 472 return AE_OK; 473 } 474 475 acpi_status 476 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 477 void *value, u32 width) 478 { 479 int result, size; 480 481 if (!value) 482 return AE_BAD_PARAMETER; 483 484 switch (width) { 485 case 8: 486 size = 1; 487 break; 488 case 16: 489 size = 2; 490 break; 491 case 32: 492 size = 4; 493 break; 494 default: 495 return AE_ERROR; 496 } 497 498 BUG_ON(!raw_pci_ops); 499 500 result = raw_pci_ops->read(pci_id->segment, pci_id->bus, 501 PCI_DEVFN(pci_id->device, pci_id->function), 502 reg, size, value); 503 504 return (result ? AE_ERROR : AE_OK); 505 } 506 507 EXPORT_SYMBOL(acpi_os_read_pci_configuration); 508 509 acpi_status 510 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 511 acpi_integer value, u32 width) 512 { 513 int result, size; 514 515 switch (width) { 516 case 8: 517 size = 1; 518 break; 519 case 16: 520 size = 2; 521 break; 522 case 32: 523 size = 4; 524 break; 525 default: 526 return AE_ERROR; 527 } 528 529 BUG_ON(!raw_pci_ops); 530 531 result = raw_pci_ops->write(pci_id->segment, pci_id->bus, 532 PCI_DEVFN(pci_id->device, pci_id->function), 533 reg, size, value); 534 535 return (result ? AE_ERROR : AE_OK); 536 } 537 538 /* TODO: Change code to take advantage of driver model more */ 539 static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */ 540 acpi_handle chandle, /* current node */ 541 struct acpi_pci_id **id, 542 int *is_bridge, u8 * bus_number) 543 { 544 acpi_handle handle; 545 struct acpi_pci_id *pci_id = *id; 546 acpi_status status; 547 unsigned long temp; 548 acpi_object_type type; 549 u8 tu8; 550 551 acpi_get_parent(chandle, &handle); 552 if (handle != rhandle) { 553 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge, 554 bus_number); 555 556 status = acpi_get_type(handle, &type); 557 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE)) 558 return; 559 560 status = 561 acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, 562 &temp); 563 if (ACPI_SUCCESS(status)) { 564 pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp)); 565 pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp)); 566 567 if (*is_bridge) 568 pci_id->bus = *bus_number; 569 570 /* any nicer way to get bus number of bridge ? */ 571 status = 572 acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8, 573 8); 574 if (ACPI_SUCCESS(status) 575 && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) { 576 status = 577 acpi_os_read_pci_configuration(pci_id, 0x18, 578 &tu8, 8); 579 if (!ACPI_SUCCESS(status)) { 580 /* Certainly broken... FIX ME */ 581 return; 582 } 583 *is_bridge = 1; 584 pci_id->bus = tu8; 585 status = 586 acpi_os_read_pci_configuration(pci_id, 0x19, 587 &tu8, 8); 588 if (ACPI_SUCCESS(status)) { 589 *bus_number = tu8; 590 } 591 } else 592 *is_bridge = 0; 593 } 594 } 595 } 596 597 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */ 598 acpi_handle chandle, /* current node */ 599 struct acpi_pci_id **id) 600 { 601 int is_bridge = 1; 602 u8 bus_number = (*id)->bus; 603 604 acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number); 605 } 606 607 static void acpi_os_execute_deferred(struct work_struct *work) 608 { 609 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 610 611 if (!dpc) { 612 printk(KERN_ERR PREFIX "Invalid (NULL) context\n"); 613 return; 614 } 615 616 dpc->function(dpc->context); 617 618 kfree(dpc); 619 620 return; 621 } 622 623 /******************************************************************************* 624 * 625 * FUNCTION: acpi_os_execute 626 * 627 * PARAMETERS: Type - Type of the callback 628 * Function - Function to be executed 629 * Context - Function parameters 630 * 631 * RETURN: Status 632 * 633 * DESCRIPTION: Depending on type, either queues function for deferred execution or 634 * immediately executes function on a separate thread. 635 * 636 ******************************************************************************/ 637 638 acpi_status acpi_os_execute(acpi_execute_type type, 639 acpi_osd_exec_callback function, void *context) 640 { 641 acpi_status status = AE_OK; 642 struct acpi_os_dpc *dpc; 643 644 ACPI_FUNCTION_TRACE("os_queue_for_execution"); 645 646 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 647 "Scheduling function [%p(%p)] for deferred execution.\n", 648 function, context)); 649 650 if (!function) 651 return_ACPI_STATUS(AE_BAD_PARAMETER); 652 653 /* 654 * Allocate/initialize DPC structure. Note that this memory will be 655 * freed by the callee. The kernel handles the work_struct list in a 656 * way that allows us to also free its memory inside the callee. 657 * Because we may want to schedule several tasks with different 658 * parameters we can't use the approach some kernel code uses of 659 * having a static work_struct. 660 */ 661 662 dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 663 if (!dpc) 664 return_ACPI_STATUS(AE_NO_MEMORY); 665 666 dpc->function = function; 667 dpc->context = context; 668 669 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 670 if (!queue_work(kacpid_wq, &dpc->work)) { 671 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 672 "Call to queue_work() failed.\n")); 673 kfree(dpc); 674 status = AE_ERROR; 675 } 676 677 return_ACPI_STATUS(status); 678 } 679 680 EXPORT_SYMBOL(acpi_os_execute); 681 682 void acpi_os_wait_events_complete(void *context) 683 { 684 flush_workqueue(kacpid_wq); 685 } 686 687 EXPORT_SYMBOL(acpi_os_wait_events_complete); 688 689 /* 690 * Allocate the memory for a spinlock and initialize it. 691 */ 692 acpi_status acpi_os_create_lock(acpi_spinlock * handle) 693 { 694 spin_lock_init(*handle); 695 696 return AE_OK; 697 } 698 699 /* 700 * Deallocate the memory for a spinlock. 701 */ 702 void acpi_os_delete_lock(acpi_spinlock handle) 703 { 704 return; 705 } 706 707 acpi_status 708 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 709 { 710 struct semaphore *sem = NULL; 711 712 713 sem = acpi_os_allocate(sizeof(struct semaphore)); 714 if (!sem) 715 return AE_NO_MEMORY; 716 memset(sem, 0, sizeof(struct semaphore)); 717 718 sema_init(sem, initial_units); 719 720 *handle = (acpi_handle *) sem; 721 722 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 723 *handle, initial_units)); 724 725 return AE_OK; 726 } 727 728 EXPORT_SYMBOL(acpi_os_create_semaphore); 729 730 /* 731 * TODO: A better way to delete semaphores? Linux doesn't have a 732 * 'delete_semaphore()' function -- may result in an invalid 733 * pointer dereference for non-synchronized consumers. Should 734 * we at least check for blocked threads and signal/cancel them? 735 */ 736 737 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 738 { 739 struct semaphore *sem = (struct semaphore *)handle; 740 741 742 if (!sem) 743 return AE_BAD_PARAMETER; 744 745 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 746 747 kfree(sem); 748 sem = NULL; 749 750 return AE_OK; 751 } 752 753 EXPORT_SYMBOL(acpi_os_delete_semaphore); 754 755 /* 756 * TODO: The kernel doesn't have a 'down_timeout' function -- had to 757 * improvise. The process is to sleep for one scheduler quantum 758 * until the semaphore becomes available. Downside is that this 759 * may result in starvation for timeout-based waits when there's 760 * lots of semaphore activity. 761 * 762 * TODO: Support for units > 1? 763 */ 764 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 765 { 766 acpi_status status = AE_OK; 767 struct semaphore *sem = (struct semaphore *)handle; 768 int ret = 0; 769 770 771 if (!sem || (units < 1)) 772 return AE_BAD_PARAMETER; 773 774 if (units > 1) 775 return AE_SUPPORT; 776 777 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 778 handle, units, timeout)); 779 780 /* 781 * This can be called during resume with interrupts off. 782 * Like boot-time, we should be single threaded and will 783 * always get the lock if we try -- timeout or not. 784 * If this doesn't succeed, then we will oops courtesy of 785 * might_sleep() in down(). 786 */ 787 if (!down_trylock(sem)) 788 return AE_OK; 789 790 switch (timeout) { 791 /* 792 * No Wait: 793 * -------- 794 * A zero timeout value indicates that we shouldn't wait - just 795 * acquire the semaphore if available otherwise return AE_TIME 796 * (a.k.a. 'would block'). 797 */ 798 case 0: 799 if (down_trylock(sem)) 800 status = AE_TIME; 801 break; 802 803 /* 804 * Wait Indefinitely: 805 * ------------------ 806 */ 807 case ACPI_WAIT_FOREVER: 808 down(sem); 809 break; 810 811 /* 812 * Wait w/ Timeout: 813 * ---------------- 814 */ 815 default: 816 // TODO: A better timeout algorithm? 817 { 818 int i = 0; 819 static const int quantum_ms = 1000 / HZ; 820 821 ret = down_trylock(sem); 822 for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) { 823 schedule_timeout_interruptible(1); 824 ret = down_trylock(sem); 825 } 826 827 if (ret != 0) 828 status = AE_TIME; 829 } 830 break; 831 } 832 833 if (ACPI_FAILURE(status)) { 834 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 835 "Failed to acquire semaphore[%p|%d|%d], %s", 836 handle, units, timeout, 837 acpi_format_exception(status))); 838 } else { 839 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 840 "Acquired semaphore[%p|%d|%d]", handle, 841 units, timeout)); 842 } 843 844 return status; 845 } 846 847 EXPORT_SYMBOL(acpi_os_wait_semaphore); 848 849 /* 850 * TODO: Support for units > 1? 851 */ 852 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 853 { 854 struct semaphore *sem = (struct semaphore *)handle; 855 856 857 if (!sem || (units < 1)) 858 return AE_BAD_PARAMETER; 859 860 if (units > 1) 861 return AE_SUPPORT; 862 863 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 864 units)); 865 866 up(sem); 867 868 return AE_OK; 869 } 870 871 EXPORT_SYMBOL(acpi_os_signal_semaphore); 872 873 #ifdef ACPI_FUTURE_USAGE 874 u32 acpi_os_get_line(char *buffer) 875 { 876 877 #ifdef ENABLE_DEBUGGER 878 if (acpi_in_debugger) { 879 u32 chars; 880 881 kdb_read(buffer, sizeof(line_buf)); 882 883 /* remove the CR kdb includes */ 884 chars = strlen(buffer) - 1; 885 buffer[chars] = '\0'; 886 } 887 #endif 888 889 return 0; 890 } 891 #endif /* ACPI_FUTURE_USAGE */ 892 893 /* Assumes no unreadable holes inbetween */ 894 u8 acpi_os_readable(void *ptr, acpi_size len) 895 { 896 #if defined(__i386__) || defined(__x86_64__) 897 char tmp; 898 return !__get_user(tmp, (char __user *)ptr) 899 && !__get_user(tmp, (char __user *)ptr + len - 1); 900 #endif 901 return 1; 902 } 903 904 #ifdef ACPI_FUTURE_USAGE 905 u8 acpi_os_writable(void *ptr, acpi_size len) 906 { 907 /* could do dummy write (racy) or a kernel page table lookup. 908 The later may be difficult at early boot when kmap doesn't work yet. */ 909 return 1; 910 } 911 #endif 912 913 acpi_status acpi_os_signal(u32 function, void *info) 914 { 915 switch (function) { 916 case ACPI_SIGNAL_FATAL: 917 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 918 break; 919 case ACPI_SIGNAL_BREAKPOINT: 920 /* 921 * AML Breakpoint 922 * ACPI spec. says to treat it as a NOP unless 923 * you are debugging. So if/when we integrate 924 * AML debugger into the kernel debugger its 925 * hook will go here. But until then it is 926 * not useful to print anything on breakpoints. 927 */ 928 break; 929 default: 930 break; 931 } 932 933 return AE_OK; 934 } 935 936 EXPORT_SYMBOL(acpi_os_signal); 937 938 static int __init acpi_os_name_setup(char *str) 939 { 940 char *p = acpi_os_name; 941 int count = ACPI_MAX_OVERRIDE_LEN - 1; 942 943 if (!str || !*str) 944 return 0; 945 946 for (; count-- && str && *str; str++) { 947 if (isalnum(*str) || *str == ' ' || *str == ':') 948 *p++ = *str; 949 else if (*str == '\'' || *str == '"') 950 continue; 951 else 952 break; 953 } 954 *p = 0; 955 956 return 1; 957 958 } 959 960 __setup("acpi_os_name=", acpi_os_name_setup); 961 962 /* 963 * _OSI control 964 * empty string disables _OSI 965 * TBD additional string adds to _OSI 966 */ 967 static int __init acpi_osi_setup(char *str) 968 { 969 if (str == NULL || *str == '\0') { 970 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 971 acpi_gbl_create_osi_method = FALSE; 972 } else { 973 /* TBD */ 974 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n", 975 str); 976 } 977 978 return 1; 979 } 980 981 __setup("acpi_osi=", acpi_osi_setup); 982 983 /* enable serialization to combat AE_ALREADY_EXISTS errors */ 984 static int __init acpi_serialize_setup(char *str) 985 { 986 printk(KERN_INFO PREFIX "serialize enabled\n"); 987 988 acpi_gbl_all_methods_serialized = TRUE; 989 990 return 1; 991 } 992 993 __setup("acpi_serialize", acpi_serialize_setup); 994 995 /* 996 * Wake and Run-Time GPES are expected to be separate. 997 * We disable wake-GPEs at run-time to prevent spurious 998 * interrupts. 999 * 1000 * However, if a system exists that shares Wake and 1001 * Run-time events on the same GPE this flag is available 1002 * to tell Linux to keep the wake-time GPEs enabled at run-time. 1003 */ 1004 static int __init acpi_wake_gpes_always_on_setup(char *str) 1005 { 1006 printk(KERN_INFO PREFIX "wake GPEs not disabled\n"); 1007 1008 acpi_gbl_leave_wake_gpes_disabled = FALSE; 1009 1010 return 1; 1011 } 1012 1013 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup); 1014 1015 static int __init acpi_hotkey_setup(char *str) 1016 { 1017 acpi_specific_hotkey_enabled = FALSE; 1018 return 1; 1019 } 1020 1021 __setup("acpi_generic_hotkey", acpi_hotkey_setup); 1022 1023 /* 1024 * max_cstate is defined in the base kernel so modules can 1025 * change it w/o depending on the state of the processor module. 1026 */ 1027 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER; 1028 1029 EXPORT_SYMBOL(max_cstate); 1030 1031 /* 1032 * Acquire a spinlock. 1033 * 1034 * handle is a pointer to the spinlock_t. 1035 */ 1036 1037 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1038 { 1039 acpi_cpu_flags flags; 1040 spin_lock_irqsave(lockp, flags); 1041 return flags; 1042 } 1043 1044 /* 1045 * Release a spinlock. See above. 1046 */ 1047 1048 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1049 { 1050 spin_unlock_irqrestore(lockp, flags); 1051 } 1052 1053 #ifndef ACPI_USE_LOCAL_CACHE 1054 1055 /******************************************************************************* 1056 * 1057 * FUNCTION: acpi_os_create_cache 1058 * 1059 * PARAMETERS: name - Ascii name for the cache 1060 * size - Size of each cached object 1061 * depth - Maximum depth of the cache (in objects) <ignored> 1062 * cache - Where the new cache object is returned 1063 * 1064 * RETURN: status 1065 * 1066 * DESCRIPTION: Create a cache object 1067 * 1068 ******************************************************************************/ 1069 1070 acpi_status 1071 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1072 { 1073 *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL); 1074 if (*cache == NULL) 1075 return AE_ERROR; 1076 else 1077 return AE_OK; 1078 } 1079 1080 /******************************************************************************* 1081 * 1082 * FUNCTION: acpi_os_purge_cache 1083 * 1084 * PARAMETERS: Cache - Handle to cache object 1085 * 1086 * RETURN: Status 1087 * 1088 * DESCRIPTION: Free all objects within the requested cache. 1089 * 1090 ******************************************************************************/ 1091 1092 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1093 { 1094 kmem_cache_shrink(cache); 1095 return (AE_OK); 1096 } 1097 1098 /******************************************************************************* 1099 * 1100 * FUNCTION: acpi_os_delete_cache 1101 * 1102 * PARAMETERS: Cache - Handle to cache object 1103 * 1104 * RETURN: Status 1105 * 1106 * DESCRIPTION: Free all objects within the requested cache and delete the 1107 * cache object. 1108 * 1109 ******************************************************************************/ 1110 1111 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1112 { 1113 kmem_cache_destroy(cache); 1114 return (AE_OK); 1115 } 1116 1117 /******************************************************************************* 1118 * 1119 * FUNCTION: acpi_os_release_object 1120 * 1121 * PARAMETERS: Cache - Handle to cache object 1122 * Object - The object to be released 1123 * 1124 * RETURN: None 1125 * 1126 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1127 * the object is deleted. 1128 * 1129 ******************************************************************************/ 1130 1131 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1132 { 1133 kmem_cache_free(cache, object); 1134 return (AE_OK); 1135 } 1136 1137 /****************************************************************************** 1138 * 1139 * FUNCTION: acpi_os_validate_interface 1140 * 1141 * PARAMETERS: interface - Requested interface to be validated 1142 * 1143 * RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise 1144 * 1145 * DESCRIPTION: Match an interface string to the interfaces supported by the 1146 * host. Strings originate from an AML call to the _OSI method. 1147 * 1148 *****************************************************************************/ 1149 1150 acpi_status 1151 acpi_os_validate_interface (char *interface) 1152 { 1153 1154 return AE_SUPPORT; 1155 } 1156 1157 1158 /****************************************************************************** 1159 * 1160 * FUNCTION: acpi_os_validate_address 1161 * 1162 * PARAMETERS: space_id - ACPI space ID 1163 * address - Physical address 1164 * length - Address length 1165 * 1166 * RETURN: AE_OK if address/length is valid for the space_id. Otherwise, 1167 * should return AE_AML_ILLEGAL_ADDRESS. 1168 * 1169 * DESCRIPTION: Validate a system address via the host OS. Used to validate 1170 * the addresses accessed by AML operation regions. 1171 * 1172 *****************************************************************************/ 1173 1174 acpi_status 1175 acpi_os_validate_address ( 1176 u8 space_id, 1177 acpi_physical_address address, 1178 acpi_size length) 1179 { 1180 1181 return AE_OK; 1182 } 1183 1184 1185 #endif 1186