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/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 <acpi/acpi.h>
  40 #include <asm/io.h>
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/processor.h>
  43 #include <asm/uaccess.h>
  44
  45 #include <linux/efi.h>
  46
  47 #define _COMPONENT              ACPI_OS_SERVICES
  48 ACPI_MODULE_NAME("osl")
  49 #define PREFIX          "ACPI: "
  50 struct acpi_os_dpc {
  51         acpi_osd_exec_callback function;
  52         void *context;
  53         struct work_struct work;
  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 static void __init acpi_request_region (struct acpi_generic_address *addr,
  79         unsigned int length, char *desc)
  80 {
  81         struct resource *res;
  82
  83         if (!addr->address || !length)
  84                 return;
  85
  86         if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_IO)
  87                 res = request_region(addr->address, length, desc);
  88         else if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
  89                 res = request_mem_region(addr->address, length, desc);
  90 }
  91
  92 static int __init acpi_reserve_resources(void)
  93 {
  94         acpi_request_region(&acpi_fadt.xpm1a_evt_blk, acpi_fadt.pm1_evt_len,
  95                 "ACPI PM1a_EVT_BLK");
  96
  97         acpi_request_region(&acpi_fadt.xpm1b_evt_blk, acpi_fadt.pm1_evt_len,
  98                 "ACPI PM1b_EVT_BLK");
  99
 100         acpi_request_region(&acpi_fadt.xpm1a_cnt_blk, acpi_fadt.pm1_cnt_len,
 101                 "ACPI PM1a_CNT_BLK");
 102
 103         acpi_request_region(&acpi_fadt.xpm1b_cnt_blk, acpi_fadt.pm1_cnt_len,
 104                 "ACPI PM1b_CNT_BLK");
 105
 106         if (acpi_fadt.pm_tm_len == 4)
 107                 acpi_request_region(&acpi_fadt.xpm_tmr_blk, 4, "ACPI PM_TMR");
 108
 109         acpi_request_region(&acpi_fadt.xpm2_cnt_blk, acpi_fadt.pm2_cnt_len,
 110                 "ACPI PM2_CNT_BLK");
 111
 112         /* Length of GPE blocks must be a non-negative multiple of 2 */
 113
 114         if (!(acpi_fadt.gpe0_blk_len & 0x1))
 115                 acpi_request_region(&acpi_fadt.xgpe0_blk,
 116                                acpi_fadt.gpe0_blk_len, "ACPI GPE0_BLK");
 117
 118         if (!(acpi_fadt.gpe1_blk_len & 0x1))
 119                 acpi_request_region(&acpi_fadt.xgpe1_blk,
 120                                acpi_fadt.gpe1_blk_len, "ACPI GPE1_BLK");
 121
 122         return 0;
 123 }
 124 device_initcall(acpi_reserve_resources);
 125
 126 acpi_status acpi_os_initialize(void)
 127 {
 128         return AE_OK;
 129 }
 130
 131 acpi_status acpi_os_initialize1(void)
 132 {
 133         /*
 134          * Initialize PCI configuration space access, as we'll need to access
 135          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 136          */
 137         if (!raw_pci_ops) {
 138                 printk(KERN_ERR PREFIX
 139                        "Access to PCI configuration space unavailable\n");
 140                 return AE_NULL_ENTRY;
 141         }
 142         kacpid_wq = create_singlethread_workqueue("kacpid");
 143         BUG_ON(!kacpid_wq);
 144
 145         return AE_OK;
 146 }
 147
 148 acpi_status acpi_os_terminate(void)
 149 {
 150         if (acpi_irq_handler) {
 151                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 152                                                  acpi_irq_handler);
 153         }
 154
 155         destroy_workqueue(kacpid_wq);
 156
 157         return AE_OK;
 158 }
 159
 160 void acpi_os_printf(const char *fmt, ...)
 161 {
 162         va_list args;
 163         va_start(args, fmt);
 164         acpi_os_vprintf(fmt, args);
 165         va_end(args);
 166 }
 167
 168 EXPORT_SYMBOL(acpi_os_printf);
 169
 170 void acpi_os_vprintf(const char *fmt, va_list args)
 171 {
 172         static char buffer[512];
 173
 174         vsprintf(buffer, fmt, args);
 175
 176 #ifdef ENABLE_DEBUGGER
 177         if (acpi_in_debugger) {
 178                 kdb_printf("%s", buffer);
 179         } else {
 180                 printk("%s", buffer);
 181         }
 182 #else
 183         printk("%s", buffer);
 184 #endif
 185 }
 186
 187 acpi_status acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
 188 {
 189         if (efi_enabled) {
 190                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
 191                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 192                         addr->pointer.physical = efi.acpi20;
 193                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 194                         addr->pointer.physical = efi.acpi;
 195                 else {
 196                         printk(KERN_ERR PREFIX
 197                                "System description tables not found\n");
 198                         return AE_NOT_FOUND;
 199                 }
 200         } else {
 201                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
 202                         printk(KERN_ERR PREFIX
 203                                "System description tables not found\n");
 204                         return AE_NOT_FOUND;
 205                 }
 206         }
 207
 208         return AE_OK;
 209 }
 210
 211 acpi_status
 212 acpi_os_map_memory(acpi_physical_address phys, acpi_size size,
 213                    void __iomem ** virt)
 214 {
 215         if (phys > ULONG_MAX) {
 216                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 217                 return AE_BAD_PARAMETER;
 218         }
 219         /*
 220          * ioremap checks to ensure this is in reserved space
 221          */
 222         *virt = ioremap((unsigned long)phys, size);
 223
 224         if (!*virt)
 225                 return AE_NO_MEMORY;
 226
 227         return AE_OK;
 228 }
 229 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 230
 231 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 232 {
 233         iounmap(virt);
 234 }
 235 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 236
 237 #ifdef ACPI_FUTURE_USAGE
 238 acpi_status
 239 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 240 {
 241         if (!phys || !virt)
 242                 return AE_BAD_PARAMETER;
 243
 244         *phys = virt_to_phys(virt);
 245
 246         return AE_OK;
 247 }
 248 #endif
 249
 250 #define ACPI_MAX_OVERRIDE_LEN 100
 251
 252 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 253
 254 acpi_status
 255 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 256                             acpi_string * new_val)
 257 {
 258         if (!init_val || !new_val)
 259                 return AE_BAD_PARAMETER;
 260
 261         *new_val = NULL;
 262         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 263                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 264                        acpi_os_name);
 265                 *new_val = acpi_os_name;
 266         }
 267
 268         return AE_OK;
 269 }
 270
 271 acpi_status
 272 acpi_os_table_override(struct acpi_table_header * existing_table,
 273                        struct acpi_table_header ** new_table)
 274 {
 275         if (!existing_table || !new_table)
 276                 return AE_BAD_PARAMETER;
 277
 278 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 279         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 280                 *new_table = (struct acpi_table_header *)AmlCode;
 281         else
 282                 *new_table = NULL;
 283 #else
 284         *new_table = NULL;
 285 #endif
 286         return AE_OK;
 287 }
 288
 289 static irqreturn_t acpi_irq(int irq, void *dev_id)
 290 {
 291         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 292 }
 293
 294 acpi_status
 295 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 296                                   void *context)
 297 {
 298         unsigned int irq;
 299
 300         /*
 301          * Ignore the GSI from the core, and use the value in our copy of the
 302          * FADT. It may not be the same if an interrupt source override exists
 303          * for the SCI.
 304          */
 305         gsi = acpi_fadt.sci_int;
 306         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 307                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 308                        gsi);
 309                 return AE_OK;
 310         }
 311
 312         acpi_irq_handler = handler;
 313         acpi_irq_context = context;
 314         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 315                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 316                 return AE_NOT_ACQUIRED;
 317         }
 318         acpi_irq_irq = irq;
 319
 320         return AE_OK;
 321 }
 322
 323 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 324 {
 325         if (irq) {
 326                 free_irq(irq, acpi_irq);
 327                 acpi_irq_handler = NULL;
 328                 acpi_irq_irq = 0;
 329         }
 330
 331         return AE_OK;
 332 }
 333
 334 /*
 335  * Running in interpreter thread context, safe to sleep
 336  */
 337
 338 void acpi_os_sleep(acpi_integer ms)
 339 {
 340         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 341 }
 342
 343 EXPORT_SYMBOL(acpi_os_sleep);
 344
 345 void acpi_os_stall(u32 us)
 346 {
 347         while (us) {
 348                 u32 delay = 1000;
 349
 350                 if (delay > us)
 351                         delay = us;
 352                 udelay(delay);
 353                 touch_nmi_watchdog();
 354                 us -= delay;
 355         }
 356 }
 357
 358 EXPORT_SYMBOL(acpi_os_stall);
 359
 360 /*
 361  * Support ACPI 3.0 AML Timer operand
 362  * Returns 64-bit free-running, monotonically increasing timer
 363  * with 100ns granularity
 364  */
 365 u64 acpi_os_get_timer(void)
 366 {
 367         static u64 t;
 368
 369 #ifdef  CONFIG_HPET
 370         /* TBD: use HPET if available */
 371 #endif
 372
 373 #ifdef  CONFIG_X86_PM_TIMER
 374         /* TBD: default to PM timer if HPET was not available */
 375 #endif
 376         if (!t)
 377                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 378
 379         return ++t;
 380 }
 381
 382 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 383 {
 384         u32 dummy;
 385
 386         if (!value)
 387                 value = &dummy;
 388
 389         switch (width) {
 390         case 8:
 391                 *(u8 *) value = inb(port);
 392                 break;
 393         case 16:
 394                 *(u16 *) value = inw(port);
 395                 break;
 396         case 32:
 397                 *(u32 *) value = inl(port);
 398                 break;
 399         default:
 400                 BUG();
 401         }
 402
 403         return AE_OK;
 404 }
 405
 406 EXPORT_SYMBOL(acpi_os_read_port);
 407
 408 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 409 {
 410         switch (width) {
 411         case 8:
 412                 outb(value, port);
 413                 break;
 414         case 16:
 415                 outw(value, port);
 416                 break;
 417         case 32:
 418                 outl(value, port);
 419                 break;
 420         default:
 421                 BUG();
 422         }
 423
 424         return AE_OK;
 425 }
 426
 427 EXPORT_SYMBOL(acpi_os_write_port);
 428
 429 acpi_status
 430 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 431 {
 432         u32 dummy;
 433         void __iomem *virt_addr;
 434
 435         virt_addr = ioremap(phys_addr, width);
 436         if (!value)
 437                 value = &dummy;
 438
 439         switch (width) {
 440         case 8:
 441                 *(u8 *) value = readb(virt_addr);
 442                 break;
 443         case 16:
 444                 *(u16 *) value = readw(virt_addr);
 445                 break;
 446         case 32:
 447                 *(u32 *) value = readl(virt_addr);
 448                 break;
 449         default:
 450                 BUG();
 451         }
 452
 453         iounmap(virt_addr);
 454
 455         return AE_OK;
 456 }
 457
 458 acpi_status
 459 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 460 {
 461         void __iomem *virt_addr;
 462
 463         virt_addr = ioremap(phys_addr, width);
 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         iounmap(virt_addr);
 480
 481         return AE_OK;
 482 }
 483
 484 acpi_status
 485 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 486                                void *value, u32 width)
 487 {
 488         int result, size;
 489
 490         if (!value)
 491                 return AE_BAD_PARAMETER;
 492
 493         switch (width) {
 494         case 8:
 495                 size = 1;
 496                 break;
 497         case 16:
 498                 size = 2;
 499                 break;
 500         case 32:
 501                 size = 4;
 502                 break;
 503         default:
 504                 return AE_ERROR;
 505         }
 506
 507         BUG_ON(!raw_pci_ops);
 508
 509         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 510                                    PCI_DEVFN(pci_id->device, pci_id->function),
 511                                    reg, size, value);
 512
 513         return (result ? AE_ERROR : AE_OK);
 514 }
 515
 516 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 517
 518 acpi_status
 519 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 520                                 acpi_integer value, u32 width)
 521 {
 522         int result, size;
 523
 524         switch (width) {
 525         case 8:
 526                 size = 1;
 527                 break;
 528         case 16:
 529                 size = 2;
 530                 break;
 531         case 32:
 532                 size = 4;
 533                 break;
 534         default:
 535                 return AE_ERROR;
 536         }
 537
 538         BUG_ON(!raw_pci_ops);
 539
 540         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 541                                     PCI_DEVFN(pci_id->device, pci_id->function),
 542                                     reg, size, value);
 543
 544         return (result ? AE_ERROR : AE_OK);
 545 }
 546
 547 /* TODO: Change code to take advantage of driver model more */
 548 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 549                                     acpi_handle chandle,        /* current node */
 550                                     struct acpi_pci_id **id,
 551                                     int *is_bridge, u8 * bus_number)
 552 {
 553         acpi_handle handle;
 554         struct acpi_pci_id *pci_id = *id;
 555         acpi_status status;
 556         unsigned long temp;
 557         acpi_object_type type;
 558         u8 tu8;
 559
 560         acpi_get_parent(chandle, &handle);
 561         if (handle != rhandle) {
 562                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 563                                         bus_number);
 564
 565                 status = acpi_get_type(handle, &type);
 566                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 567                         return;
 568
 569                 status =
 570                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 571                                           &temp);
 572                 if (ACPI_SUCCESS(status)) {
 573                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 574                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 575
 576                         if (*is_bridge)
 577                                 pci_id->bus = *bus_number;
 578
 579                         /* any nicer way to get bus number of bridge ? */
 580                         status =
 581                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 582                                                            8);
 583                         if (ACPI_SUCCESS(status)
 584                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 585                                 status =
 586                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 587                                                                    &tu8, 8);
 588                                 if (!ACPI_SUCCESS(status)) {
 589                                         /* Certainly broken...  FIX ME */
 590                                         return;
 591                                 }
 592                                 *is_bridge = 1;
 593                                 pci_id->bus = tu8;
 594                                 status =
 595                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 596                                                                    &tu8, 8);
 597                                 if (ACPI_SUCCESS(status)) {
 598                                         *bus_number = tu8;
 599                                 }
 600                         } else
 601                                 *is_bridge = 0;
 602                 }
 603         }
 604 }
 605
 606 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 607                            acpi_handle chandle, /* current node */
 608                            struct acpi_pci_id **id)
 609 {
 610         int is_bridge = 1;
 611         u8 bus_number = (*id)->bus;
 612
 613         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 614 }
 615
 616 static void acpi_os_execute_deferred(struct work_struct *work)
 617 {
 618         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 619         if (!dpc) {
 620                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 621                 return;
 622         }
 623
 624         dpc->function(dpc->context);
 625
 626         kfree(dpc);
 627
 628         return;
 629 }
 630
 631 /*******************************************************************************
 632  *
 633  * FUNCTION:    acpi_os_execute
 634  *
 635  * PARAMETERS:  Type               - Type of the callback
 636  *              Function           - Function to be executed
 637  *              Context            - Function parameters
 638  *
 639  * RETURN:      Status
 640  *
 641  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 642  *              immediately executes function on a separate thread.
 643  *
 644  ******************************************************************************/
 645
 646 acpi_status acpi_os_execute(acpi_execute_type type,
 647                             acpi_osd_exec_callback function, void *context)
 648 {
 649         acpi_status status = AE_OK;
 650         struct acpi_os_dpc *dpc;
 651
 652         ACPI_FUNCTION_TRACE("os_queue_for_execution");
 653
 654         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 655                           "Scheduling function [%p(%p)] for deferred execution.\n",
 656                           function, context));
 657
 658         if (!function)
 659                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 660
 661         /*
 662          * Allocate/initialize DPC structure.  Note that this memory will be
 663          * freed by the callee.  The kernel handles the work_struct list  in a
 664          * way that allows us to also free its memory inside the callee.
 665          * Because we may want to schedule several tasks with different
 666          * parameters we can't use the approach some kernel code uses of
 667          * having a static work_struct.
 668          */
 669
 670         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 671         if (!dpc)
 672                 return_ACPI_STATUS(AE_NO_MEMORY);
 673
 674         dpc->function = function;
 675         dpc->context = context;
 676
 677         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 678         if (!queue_work(kacpid_wq, &dpc->work)) {
 679                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 680                                   "Call to queue_work() failed.\n"));
 681                 kfree(dpc);
 682                 status = AE_ERROR;
 683         }
 684
 685         return_ACPI_STATUS(status);
 686 }
 687
 688 EXPORT_SYMBOL(acpi_os_execute);
 689
 690 void acpi_os_wait_events_complete(void *context)
 691 {
 692         flush_workqueue(kacpid_wq);
 693 }
 694
 695 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 696
 697 /*
 698  * Allocate the memory for a spinlock and initialize it.
 699  */
 700 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 701 {
 702         spin_lock_init(*handle);
 703
 704         return AE_OK;
 705 }
 706
 707 /*
 708  * Deallocate the memory for a spinlock.
 709  */
 710 void acpi_os_delete_lock(acpi_spinlock handle)
 711 {
 712         return;
 713 }
 714
 715 acpi_status
 716 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 717 {
 718         struct semaphore *sem = NULL;
 719
 720
 721         sem = acpi_os_allocate(sizeof(struct semaphore));
 722         if (!sem)
 723                 return AE_NO_MEMORY;
 724         memset(sem, 0, sizeof(struct semaphore));
 725
 726         sema_init(sem, initial_units);
 727
 728         *handle = (acpi_handle *) sem;
 729
 730         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 731                           *handle, initial_units));
 732
 733         return AE_OK;
 734 }
 735
 736 EXPORT_SYMBOL(acpi_os_create_semaphore);
 737
 738 /*
 739  * TODO: A better way to delete semaphores?  Linux doesn't have a
 740  * 'delete_semaphore()' function -- may result in an invalid
 741  * pointer dereference for non-synchronized consumers.  Should
 742  * we at least check for blocked threads and signal/cancel them?
 743  */
 744
 745 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 746 {
 747         struct semaphore *sem = (struct semaphore *)handle;
 748
 749
 750         if (!sem)
 751                 return AE_BAD_PARAMETER;
 752
 753         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 754
 755         kfree(sem);
 756         sem = NULL;
 757
 758         return AE_OK;
 759 }
 760
 761 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 762
 763 /*
 764  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 765  * improvise.  The process is to sleep for one scheduler quantum
 766  * until the semaphore becomes available.  Downside is that this
 767  * may result in starvation for timeout-based waits when there's
 768  * lots of semaphore activity.
 769  *
 770  * TODO: Support for units > 1?
 771  */
 772 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 773 {
 774         acpi_status status = AE_OK;
 775         struct semaphore *sem = (struct semaphore *)handle;
 776         int ret = 0;
 777
 778
 779         if (!sem || (units < 1))
 780                 return AE_BAD_PARAMETER;
 781
 782         if (units > 1)
 783                 return AE_SUPPORT;
 784
 785         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 786                           handle, units, timeout));
 787
 788         /*
 789          * This can be called during resume with interrupts off.
 790          * Like boot-time, we should be single threaded and will
 791          * always get the lock if we try -- timeout or not.
 792          * If this doesn't succeed, then we will oops courtesy of
 793          * might_sleep() in down().
 794          */
 795         if (!down_trylock(sem))
 796                 return AE_OK;
 797
 798         switch (timeout) {
 799                 /*
 800                  * No Wait:
 801                  * --------
 802                  * A zero timeout value indicates that we shouldn't wait - just
 803                  * acquire the semaphore if available otherwise return AE_TIME
 804                  * (a.k.a. 'would block').
 805                  */
 806         case 0:
 807                 if (down_trylock(sem))
 808                         status = AE_TIME;
 809                 break;
 810
 811                 /*
 812                  * Wait Indefinitely:
 813                  * ------------------
 814                  */
 815         case ACPI_WAIT_FOREVER:
 816                 down(sem);
 817                 break;
 818
 819                 /*
 820                  * Wait w/ Timeout:
 821                  * ----------------
 822                  */
 823         default:
 824                 // TODO: A better timeout algorithm?
 825                 {
 826                         int i = 0;
 827                         static const int quantum_ms = 1000 / HZ;
 828
 829                         ret = down_trylock(sem);
 830                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 831                                 schedule_timeout_interruptible(1);
 832                                 ret = down_trylock(sem);
 833                         }
 834
 835                         if (ret != 0)
 836                                 status = AE_TIME;
 837                 }
 838                 break;
 839         }
 840
 841         if (ACPI_FAILURE(status)) {
 842                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 843                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 844                                   handle, units, timeout,
 845                                   acpi_format_exception(status)));
 846         } else {
 847                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 848                                   "Acquired semaphore[%p|%d|%d]", handle,
 849                                   units, timeout));
 850         }
 851
 852         return status;
 853 }
 854
 855 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 856
 857 /*
 858  * TODO: Support for units > 1?
 859  */
 860 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 861 {
 862         struct semaphore *sem = (struct semaphore *)handle;
 863
 864
 865         if (!sem || (units < 1))
 866                 return AE_BAD_PARAMETER;
 867
 868         if (units > 1)
 869                 return AE_SUPPORT;
 870
 871         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 872                           units));
 873
 874         up(sem);
 875
 876         return AE_OK;
 877 }
 878
 879 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 880
 881 #ifdef ACPI_FUTURE_USAGE
 882 u32 acpi_os_get_line(char *buffer)
 883 {
 884
 885 #ifdef ENABLE_DEBUGGER
 886         if (acpi_in_debugger) {
 887                 u32 chars;
 888
 889                 kdb_read(buffer, sizeof(line_buf));
 890
 891                 /* remove the CR kdb includes */
 892                 chars = strlen(buffer) - 1;
 893                 buffer[chars] = '\0';
 894         }
 895 #endif
 896
 897         return 0;
 898 }
 899 #endif                          /*  ACPI_FUTURE_USAGE  */
 900
 901 /* Assumes no unreadable holes inbetween */
 902 u8 acpi_os_readable(void *ptr, acpi_size len)
 903 {
 904 #if defined(__i386__) || defined(__x86_64__)
 905         char tmp;
 906         return !__get_user(tmp, (char __user *)ptr)
 907             && !__get_user(tmp, (char __user *)ptr + len - 1);
 908 #endif
 909         return 1;
 910 }
 911
 912 #ifdef ACPI_FUTURE_USAGE
 913 u8 acpi_os_writable(void *ptr, acpi_size len)
 914 {
 915         /* could do dummy write (racy) or a kernel page table lookup.
 916            The later may be difficult at early boot when kmap doesn't work yet. */
 917         return 1;
 918 }
 919 #endif
 920
 921 acpi_status acpi_os_signal(u32 function, void *info)
 922 {
 923         switch (function) {
 924         case ACPI_SIGNAL_FATAL:
 925                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 926                 break;
 927         case ACPI_SIGNAL_BREAKPOINT:
 928                 /*
 929                  * AML Breakpoint
 930                  * ACPI spec. says to treat it as a NOP unless
 931                  * you are debugging.  So if/when we integrate
 932                  * AML debugger into the kernel debugger its
 933                  * hook will go here.  But until then it is
 934                  * not useful to print anything on breakpoints.
 935                  */
 936                 break;
 937         default:
 938                 break;
 939         }
 940
 941         return AE_OK;
 942 }
 943
 944 EXPORT_SYMBOL(acpi_os_signal);
 945
 946 static int __init acpi_os_name_setup(char *str)
 947 {
 948         char *p = acpi_os_name;
 949         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 950
 951         if (!str || !*str)
 952                 return 0;
 953
 954         for (; count-- && str && *str; str++) {
 955                 if (isalnum(*str) || *str == ' ' || *str == ':')
 956                         *p++ = *str;
 957                 else if (*str == '\'' || *str == '"')
 958                         continue;
 959                 else
 960                         break;
 961         }
 962         *p = 0;
 963
 964         return 1;
 965
 966 }
 967
 968 __setup("acpi_os_name=", acpi_os_name_setup);
 969
 970 /*
 971  * _OSI control
 972  * empty string disables _OSI
 973  * TBD additional string adds to _OSI
 974  */
 975 static int __init acpi_osi_setup(char *str)
 976 {
 977         if (str == NULL || *str == '\0') {
 978                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
 979                 acpi_gbl_create_osi_method = FALSE;
 980         } else {
 981                 /* TBD */
 982                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
 983                        str);
 984         }
 985
 986         return 1;
 987 }
 988
 989 __setup("acpi_osi=", acpi_osi_setup);
 990
 991 /* enable serialization to combat AE_ALREADY_EXISTS errors */
 992 static int __init acpi_serialize_setup(char *str)
 993 {
 994         printk(KERN_INFO PREFIX "serialize enabled\n");
 995
 996         acpi_gbl_all_methods_serialized = TRUE;
 997
 998         return 1;
 999 }
1000
1001 __setup("acpi_serialize", acpi_serialize_setup);
1002
1003 /*
1004  * Wake and Run-Time GPES are expected to be separate.
1005  * We disable wake-GPEs at run-time to prevent spurious
1006  * interrupts.
1007  *
1008  * However, if a system exists that shares Wake and
1009  * Run-time events on the same GPE this flag is available
1010  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1011  */
1012 static int __init acpi_wake_gpes_always_on_setup(char *str)
1013 {
1014         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1015
1016         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1017
1018         return 1;
1019 }
1020
1021 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1022
1023 static int __init acpi_hotkey_setup(char *str)
1024 {
1025         acpi_specific_hotkey_enabled = FALSE;
1026         return 1;
1027 }
1028
1029 __setup("acpi_generic_hotkey", acpi_hotkey_setup);
1030
1031 /*
1032  * max_cstate is defined in the base kernel so modules can
1033  * change it w/o depending on the state of the processor module.
1034  */
1035 unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
1036
1037 EXPORT_SYMBOL(max_cstate);
1038
1039 /*
1040  * Acquire a spinlock.
1041  *
1042  * handle is a pointer to the spinlock_t.
1043  */
1044
1045 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1046 {
1047         acpi_cpu_flags flags;
1048         spin_lock_irqsave(lockp, flags);
1049         return flags;
1050 }
1051
1052 /*
1053  * Release a spinlock. See above.
1054  */
1055
1056 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1057 {
1058         spin_unlock_irqrestore(lockp, flags);
1059 }
1060
1061 #ifndef ACPI_USE_LOCAL_CACHE
1062
1063 /*******************************************************************************
1064  *
1065  * FUNCTION:    acpi_os_create_cache
1066  *
1067  * PARAMETERS:  name      - Ascii name for the cache
1068  *              size      - Size of each cached object
1069  *              depth     - Maximum depth of the cache (in objects) <ignored>
1070  *              cache     - Where the new cache object is returned
1071  *
1072  * RETURN:      status
1073  *
1074  * DESCRIPTION: Create a cache object
1075  *
1076  ******************************************************************************/
1077
1078 acpi_status
1079 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1080 {
1081         *cache = kmem_cache_create(name, size, 0, 0, NULL, NULL);
1082         if (cache == NULL)
1083                 return AE_ERROR;
1084         else
1085                 return AE_OK;
1086 }
1087
1088 /*******************************************************************************
1089  *
1090  * FUNCTION:    acpi_os_purge_cache
1091  *
1092  * PARAMETERS:  Cache           - Handle to cache object
1093  *
1094  * RETURN:      Status
1095  *
1096  * DESCRIPTION: Free all objects within the requested cache.
1097  *
1098  ******************************************************************************/
1099
1100 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1101 {
1102         (void)kmem_cache_shrink(cache);
1103         return (AE_OK);
1104 }
1105
1106 /*******************************************************************************
1107  *
1108  * FUNCTION:    acpi_os_delete_cache
1109  *
1110  * PARAMETERS:  Cache           - Handle to cache object
1111  *
1112  * RETURN:      Status
1113  *
1114  * DESCRIPTION: Free all objects within the requested cache and delete the
1115  *              cache object.
1116  *
1117  ******************************************************************************/
1118
1119 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1120 {
1121         kmem_cache_destroy(cache);
1122         return (AE_OK);
1123 }
1124
1125 /*******************************************************************************
1126  *
1127  * FUNCTION:    acpi_os_release_object
1128  *
1129  * PARAMETERS:  Cache       - Handle to cache object
1130  *              Object      - The object to be released
1131  *
1132  * RETURN:      None
1133  *
1134  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1135  *              the object is deleted.
1136  *
1137  ******************************************************************************/
1138
1139 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1140 {
1141         kmem_cache_free(cache, object);
1142         return (AE_OK);
1143 }
1144
1145 /******************************************************************************
1146  *
1147  * FUNCTION:    acpi_os_validate_interface
1148  *
1149  * PARAMETERS:  interface           - Requested interface to be validated
1150  *
1151  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1152  *
1153  * DESCRIPTION: Match an interface string to the interfaces supported by the
1154  *              host. Strings originate from an AML call to the _OSI method.
1155  *
1156  *****************************************************************************/
1157
1158 acpi_status
1159 acpi_os_validate_interface (char *interface)
1160 {
1161
1162     return AE_SUPPORT;
1163 }
1164
1165
1166 /******************************************************************************
1167  *
1168  * FUNCTION:    acpi_os_validate_address
1169  *
1170  * PARAMETERS:  space_id             - ACPI space ID
1171  *              address             - Physical address
1172  *              length              - Address length
1173  *
1174  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1175  *              should return AE_AML_ILLEGAL_ADDRESS.
1176  *
1177  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1178  *              the addresses accessed by AML operation regions.
1179  *
1180  *****************************************************************************/
1181
1182 acpi_status
1183 acpi_os_validate_address (
1184     u8                   space_id,
1185     acpi_physical_address   address,
1186     acpi_size               length)
1187 {
1188
1189     return AE_OK;
1190 }
1191
1192
1193 #endif