drivers/acpi/osl.c

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