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