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  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <willy@linux.intel.com>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/pci.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 <linux/acpi.h>
  41 #include <linux/efi.h>
  42 #include <linux/ioport.h>
  43 #include <linux/list.h>
  44 #include <linux/jiffies.h>
  45 #include <linux/semaphore.h>
  46
  47 #include <asm/io.h>
  48 #include <asm/uaccess.h>
  49
  50 #include <acpi/acpi.h>
  51 #include <acpi/acpi_bus.h>
  52 #include <acpi/processor.h>
  53
  54 #define _COMPONENT              ACPI_OS_SERVICES
  55 ACPI_MODULE_NAME("osl");
  56 #define PREFIX          "ACPI: "
  57 struct acpi_os_dpc {
  58         acpi_osd_exec_callback function;
  59         void *context;
  60         struct work_struct work;
  61         int wait;
  62 };
  63
  64 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  65 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  66 #endif
  67
  68 #ifdef ENABLE_DEBUGGER
  69 #include <linux/kdb.h>
  70
  71 /* stuff for debugger support */
  72 int acpi_in_debugger;
  73 EXPORT_SYMBOL(acpi_in_debugger);
  74
  75 extern char line_buf[80];
  76 #endif                          /*ENABLE_DEBUGGER */
  77
  78 static unsigned int acpi_irq_irq;
  79 static acpi_osd_handler acpi_irq_handler;
  80 static void *acpi_irq_context;
  81 static struct workqueue_struct *kacpid_wq;
  82 static struct workqueue_struct *kacpi_notify_wq;
  83 static struct workqueue_struct *kacpi_hotplug_wq;
  84
  85 struct acpi_res_list {
  86         resource_size_t start;
  87         resource_size_t end;
  88         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  89         char name[5];   /* only can have a length of 4 chars, make use of this
  90                            one instead of res->name, no need to kalloc then */
  91         struct list_head resource_list;
  92         int count;
  93 };
  94
  95 static LIST_HEAD(resource_list_head);
  96 static DEFINE_SPINLOCK(acpi_res_lock);
  97
  98 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  99 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
 100
 101 /*
 102  * The story of _OSI(Linux)
 103  *
 104  * From pre-history through Linux-2.6.22,
 105  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 106  *
 107  * Unfortunately, reference BIOS writers got wind of this
 108  * and put OSI(Linux) in their example code, quickly exposing
 109  * this string as ill-conceived and opening the door to
 110  * an un-bounded number of BIOS incompatibilities.
 111  *
 112  * For example, OSI(Linux) was used on resume to re-POST a
 113  * video card on one system, because Linux at that time
 114  * could not do a speedy restore in its native driver.
 115  * But then upon gaining quick native restore capability,
 116  * Linux has no way to tell the BIOS to skip the time-consuming
 117  * POST -- putting Linux at a permanent performance disadvantage.
 118  * On another system, the BIOS writer used OSI(Linux)
 119  * to infer native OS support for IPMI!  On other systems,
 120  * OSI(Linux) simply got in the way of Linux claiming to
 121  * be compatible with other operating systems, exposing
 122  * BIOS issues such as skipped device initialization.
 123  *
 124  * So "Linux" turned out to be a really poor chose of
 125  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 126  *
 127  * BIOS writers should NOT query _OSI(Linux) on future systems.
 128  * Linux will complain on the console when it sees it, and return FALSE.
 129  * To get Linux to return TRUE for your system  will require
 130  * a kernel source update to add a DMI entry,
 131  * or boot with "acpi_osi=Linux"
 132  */
 133
 134 static struct osi_linux {
 135         unsigned int    enable:1;
 136         unsigned int    dmi:1;
 137         unsigned int    cmdline:1;
 138         unsigned int    known:1;
 139 } osi_linux = { 0, 0, 0, 0};
 140
 141 static void __init acpi_request_region (struct acpi_generic_address *addr,
 142         unsigned int length, char *desc)
 143 {
 144         if (!addr->address || !length)
 145                 return;
 146
 147         /* Resources are never freed */
 148         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 149                 request_region(addr->address, length, desc);
 150         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 151                 request_mem_region(addr->address, length, desc);
 152 }
 153
 154 static int __init acpi_reserve_resources(void)
 155 {
 156         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 157                 "ACPI PM1a_EVT_BLK");
 158
 159         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 160                 "ACPI PM1b_EVT_BLK");
 161
 162         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 163                 "ACPI PM1a_CNT_BLK");
 164
 165         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 166                 "ACPI PM1b_CNT_BLK");
 167
 168         if (acpi_gbl_FADT.pm_timer_length == 4)
 169                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 170
 171         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 172                 "ACPI PM2_CNT_BLK");
 173
 174         /* Length of GPE blocks must be a non-negative multiple of 2 */
 175
 176         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 177                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 178                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 179
 180         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 181                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 182                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 183
 184         return 0;
 185 }
 186 device_initcall(acpi_reserve_resources);
 187
 188 acpi_status __init acpi_os_initialize(void)
 189 {
 190         return AE_OK;
 191 }
 192
 193 acpi_status acpi_os_initialize1(void)
 194 {
 195         kacpid_wq = create_workqueue("kacpid");
 196         kacpi_notify_wq = create_workqueue("kacpi_notify");
 197         kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
 198         BUG_ON(!kacpid_wq);
 199         BUG_ON(!kacpi_notify_wq);
 200         BUG_ON(!kacpi_hotplug_wq);
 201         return AE_OK;
 202 }
 203
 204 acpi_status acpi_os_terminate(void)
 205 {
 206         if (acpi_irq_handler) {
 207                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 208                                                  acpi_irq_handler);
 209         }
 210
 211         destroy_workqueue(kacpid_wq);
 212         destroy_workqueue(kacpi_notify_wq);
 213         destroy_workqueue(kacpi_hotplug_wq);
 214
 215         return AE_OK;
 216 }
 217
 218 void acpi_os_printf(const char *fmt, ...)
 219 {
 220         va_list args;
 221         va_start(args, fmt);
 222         acpi_os_vprintf(fmt, args);
 223         va_end(args);
 224 }
 225
 226 void acpi_os_vprintf(const char *fmt, va_list args)
 227 {
 228         static char buffer[512];
 229
 230         vsprintf(buffer, fmt, args);
 231
 232 #ifdef ENABLE_DEBUGGER
 233         if (acpi_in_debugger) {
 234                 kdb_printf("%s", buffer);
 235         } else {
 236                 printk(KERN_CONT "%s", buffer);
 237         }
 238 #else
 239         printk(KERN_CONT "%s", buffer);
 240 #endif
 241 }
 242
 243 acpi_physical_address __init acpi_os_get_root_pointer(void)
 244 {
 245         if (efi_enabled) {
 246                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 247                         return efi.acpi20;
 248                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 249                         return efi.acpi;
 250                 else {
 251                         printk(KERN_ERR PREFIX
 252                                "System description tables not found\n");
 253                         return 0;
 254                 }
 255         } else {
 256                 acpi_physical_address pa = 0;
 257
 258                 acpi_find_root_pointer(&pa);
 259                 return pa;
 260         }
 261 }
 262
 263 void __iomem *__init_refok
 264 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 265 {
 266         if (phys > ULONG_MAX) {
 267                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 268                 return NULL;
 269         }
 270         if (acpi_gbl_permanent_mmap)
 271                 /*
 272                 * ioremap checks to ensure this is in reserved space
 273                 */
 274                 return ioremap((unsigned long)phys, size);
 275         else
 276                 return __acpi_map_table((unsigned long)phys, size);
 277 }
 278 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 279
 280 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 281 {
 282         if (acpi_gbl_permanent_mmap)
 283                 iounmap(virt);
 284         else
 285                 __acpi_unmap_table(virt, size);
 286 }
 287 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 288
 289 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 290 {
 291         if (!acpi_gbl_permanent_mmap)
 292                 __acpi_unmap_table(virt, size);
 293 }
 294
 295 #ifdef ACPI_FUTURE_USAGE
 296 acpi_status
 297 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 298 {
 299         if (!phys || !virt)
 300                 return AE_BAD_PARAMETER;
 301
 302         *phys = virt_to_phys(virt);
 303
 304         return AE_OK;
 305 }
 306 #endif
 307
 308 #define ACPI_MAX_OVERRIDE_LEN 100
 309
 310 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 311
 312 acpi_status
 313 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 314                             acpi_string * new_val)
 315 {
 316         if (!init_val || !new_val)
 317                 return AE_BAD_PARAMETER;
 318
 319         *new_val = NULL;
 320         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 321                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 322                        acpi_os_name);
 323                 *new_val = acpi_os_name;
 324         }
 325
 326         return AE_OK;
 327 }
 328
 329 acpi_status
 330 acpi_os_table_override(struct acpi_table_header * existing_table,
 331                        struct acpi_table_header ** new_table)
 332 {
 333         if (!existing_table || !new_table)
 334                 return AE_BAD_PARAMETER;
 335
 336         *new_table = NULL;
 337
 338 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 339         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 340                 *new_table = (struct acpi_table_header *)AmlCode;
 341 #endif
 342         if (*new_table != NULL) {
 343                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 344                            "this is unsafe: tainting kernel\n",
 345                        existing_table->signature,
 346                        existing_table->oem_table_id);
 347                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 348         }
 349         return AE_OK;
 350 }
 351
 352 static irqreturn_t acpi_irq(int irq, void *dev_id)
 353 {
 354         u32 handled;
 355
 356         handled = (*acpi_irq_handler) (acpi_irq_context);
 357
 358         if (handled) {
 359                 acpi_irq_handled++;
 360                 return IRQ_HANDLED;
 361         } else {
 362                 acpi_irq_not_handled++;
 363                 return IRQ_NONE;
 364         }
 365 }
 366
 367 acpi_status
 368 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 369                                   void *context)
 370 {
 371         unsigned int irq;
 372
 373         acpi_irq_stats_init();
 374
 375         /*
 376          * Ignore the GSI from the core, and use the value in our copy of the
 377          * FADT. It may not be the same if an interrupt source override exists
 378          * for the SCI.
 379          */
 380         gsi = acpi_gbl_FADT.sci_interrupt;
 381         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 382                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 383                        gsi);
 384                 return AE_OK;
 385         }
 386
 387         acpi_irq_handler = handler;
 388         acpi_irq_context = context;
 389         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 390                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 391                 return AE_NOT_ACQUIRED;
 392         }
 393         acpi_irq_irq = irq;
 394
 395         return AE_OK;
 396 }
 397
 398 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 399 {
 400         if (irq) {
 401                 free_irq(irq, acpi_irq);
 402                 acpi_irq_handler = NULL;
 403                 acpi_irq_irq = 0;
 404         }
 405
 406         return AE_OK;
 407 }
 408
 409 /*
 410  * Running in interpreter thread context, safe to sleep
 411  */
 412
 413 void acpi_os_sleep(u64 ms)
 414 {
 415         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 416 }
 417
 418 void acpi_os_stall(u32 us)
 419 {
 420         while (us) {
 421                 u32 delay = 1000;
 422
 423                 if (delay > us)
 424                         delay = us;
 425                 udelay(delay);
 426                 touch_nmi_watchdog();
 427                 us -= delay;
 428         }
 429 }
 430
 431 /*
 432  * Support ACPI 3.0 AML Timer operand
 433  * Returns 64-bit free-running, monotonically increasing timer
 434  * with 100ns granularity
 435  */
 436 u64 acpi_os_get_timer(void)
 437 {
 438         static u64 t;
 439
 440 #ifdef  CONFIG_HPET
 441         /* TBD: use HPET if available */
 442 #endif
 443
 444 #ifdef  CONFIG_X86_PM_TIMER
 445         /* TBD: default to PM timer if HPET was not available */
 446 #endif
 447         if (!t)
 448                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 449
 450         return ++t;
 451 }
 452
 453 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 454 {
 455         u32 dummy;
 456
 457         if (!value)
 458                 value = &dummy;
 459
 460         *value = 0;
 461         if (width <= 8) {
 462                 *(u8 *) value = inb(port);
 463         } else if (width <= 16) {
 464                 *(u16 *) value = inw(port);
 465         } else if (width <= 32) {
 466                 *(u32 *) value = inl(port);
 467         } else {
 468                 BUG();
 469         }
 470
 471         return AE_OK;
 472 }
 473
 474 EXPORT_SYMBOL(acpi_os_read_port);
 475
 476 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 477 {
 478         if (width <= 8) {
 479                 outb(value, port);
 480         } else if (width <= 16) {
 481                 outw(value, port);
 482         } else if (width <= 32) {
 483                 outl(value, port);
 484         } else {
 485                 BUG();
 486         }
 487
 488         return AE_OK;
 489 }
 490
 491 EXPORT_SYMBOL(acpi_os_write_port);
 492
 493 acpi_status
 494 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 495 {
 496         u32 dummy;
 497         void __iomem *virt_addr;
 498
 499         virt_addr = ioremap(phys_addr, width);
 500         if (!value)
 501                 value = &dummy;
 502
 503         switch (width) {
 504         case 8:
 505                 *(u8 *) value = readb(virt_addr);
 506                 break;
 507         case 16:
 508                 *(u16 *) value = readw(virt_addr);
 509                 break;
 510         case 32:
 511                 *(u32 *) value = readl(virt_addr);
 512                 break;
 513         default:
 514                 BUG();
 515         }
 516
 517         iounmap(virt_addr);
 518
 519         return AE_OK;
 520 }
 521
 522 acpi_status
 523 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 524 {
 525         void __iomem *virt_addr;
 526
 527         virt_addr = ioremap(phys_addr, width);
 528
 529         switch (width) {
 530         case 8:
 531                 writeb(value, virt_addr);
 532                 break;
 533         case 16:
 534                 writew(value, virt_addr);
 535                 break;
 536         case 32:
 537                 writel(value, virt_addr);
 538                 break;
 539         default:
 540                 BUG();
 541         }
 542
 543         iounmap(virt_addr);
 544
 545         return AE_OK;
 546 }
 547
 548 acpi_status
 549 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 550                                u32 *value, u32 width)
 551 {
 552         int result, size;
 553
 554         if (!value)
 555                 return AE_BAD_PARAMETER;
 556
 557         switch (width) {
 558         case 8:
 559                 size = 1;
 560                 break;
 561         case 16:
 562                 size = 2;
 563                 break;
 564         case 32:
 565                 size = 4;
 566                 break;
 567         default:
 568                 return AE_ERROR;
 569         }
 570
 571         result = raw_pci_read(pci_id->segment, pci_id->bus,
 572                                 PCI_DEVFN(pci_id->device, pci_id->function),
 573                                 reg, size, value);
 574
 575         return (result ? AE_ERROR : AE_OK);
 576 }
 577
 578 acpi_status
 579 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 580                                 u64 value, u32 width)
 581 {
 582         int result, size;
 583
 584         switch (width) {
 585         case 8:
 586                 size = 1;
 587                 break;
 588         case 16:
 589                 size = 2;
 590                 break;
 591         case 32:
 592                 size = 4;
 593                 break;
 594         default:
 595                 return AE_ERROR;
 596         }
 597
 598         result = raw_pci_write(pci_id->segment, pci_id->bus,
 599                                 PCI_DEVFN(pci_id->device, pci_id->function),
 600                                 reg, size, value);
 601
 602         return (result ? AE_ERROR : AE_OK);
 603 }
 604
 605 /* TODO: Change code to take advantage of driver model more */
 606 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 607                                     acpi_handle chandle,        /* current node */
 608                                     struct acpi_pci_id **id,
 609                                     int *is_bridge, u8 * bus_number)
 610 {
 611         acpi_handle handle;
 612         struct acpi_pci_id *pci_id = *id;
 613         acpi_status status;
 614         unsigned long long temp;
 615         acpi_object_type type;
 616
 617         acpi_get_parent(chandle, &handle);
 618         if (handle != rhandle) {
 619                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 620                                         bus_number);
 621
 622                 status = acpi_get_type(handle, &type);
 623                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 624                         return;
 625
 626                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 627                                           &temp);
 628                 if (ACPI_SUCCESS(status)) {
 629                         u32 val;
 630                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 631                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 632
 633                         if (*is_bridge)
 634                                 pci_id->bus = *bus_number;
 635
 636                         /* any nicer way to get bus number of bridge ? */
 637                         status =
 638                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 639                                                            8);
 640                         if (ACPI_SUCCESS(status)
 641                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 642                                 status =
 643                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 644                                                                    &val, 8);
 645                                 if (!ACPI_SUCCESS(status)) {
 646                                         /* Certainly broken...  FIX ME */
 647                                         return;
 648                                 }
 649                                 *is_bridge = 1;
 650                                 pci_id->bus = val;
 651                                 status =
 652                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 653                                                                    &val, 8);
 654                                 if (ACPI_SUCCESS(status)) {
 655                                         *bus_number = val;
 656                                 }
 657                         } else
 658                                 *is_bridge = 0;
 659                 }
 660         }
 661 }
 662
 663 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 664                            acpi_handle chandle, /* current node */
 665                            struct acpi_pci_id **id)
 666 {
 667         int is_bridge = 1;
 668         u8 bus_number = (*id)->bus;
 669
 670         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 671 }
 672
 673 static void acpi_os_execute_deferred(struct work_struct *work)
 674 {
 675         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 676
 677         if (dpc->wait)
 678                 acpi_os_wait_events_complete(NULL);
 679
 680         dpc->function(dpc->context);
 681         kfree(dpc);
 682 }
 683
 684 /*******************************************************************************
 685  *
 686  * FUNCTION:    acpi_os_execute
 687  *
 688  * PARAMETERS:  Type               - Type of the callback
 689  *              Function           - Function to be executed
 690  *              Context            - Function parameters
 691  *
 692  * RETURN:      Status
 693  *
 694  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 695  *              immediately executes function on a separate thread.
 696  *
 697  ******************************************************************************/
 698
 699 static acpi_status __acpi_os_execute(acpi_execute_type type,
 700         acpi_osd_exec_callback function, void *context, int hp)
 701 {
 702         acpi_status status = AE_OK;
 703         struct acpi_os_dpc *dpc;
 704         struct workqueue_struct *queue;
 705         int ret;
 706         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 707                           "Scheduling function [%p(%p)] for deferred execution.\n",
 708                           function, context));
 709
 710         /*
 711          * Allocate/initialize DPC structure.  Note that this memory will be
 712          * freed by the callee.  The kernel handles the work_struct list  in a
 713          * way that allows us to also free its memory inside the callee.
 714          * Because we may want to schedule several tasks with different
 715          * parameters we can't use the approach some kernel code uses of
 716          * having a static work_struct.
 717          */
 718
 719         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 720         if (!dpc)
 721                 return AE_NO_MEMORY;
 722
 723         dpc->function = function;
 724         dpc->context = context;
 725
 726         /*
 727          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 728          * because the hotplug code may call driver .remove() functions,
 729          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 730          * to flush these workqueues.
 731          */
 732         queue = hp ? kacpi_hotplug_wq :
 733                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 734         dpc->wait = hp ? 1 : 0;
 735
 736         if (queue == kacpi_hotplug_wq)
 737                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 738         else if (queue == kacpi_notify_wq)
 739                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 740         else
 741                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 742
 743         /*
 744          * On some machines, a software-initiated SMI causes corruption unless
 745          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 746          * typically it's done in GPE-related methods that are run via
 747          * workqueues, so we can avoid the known corruption cases by always
 748          * queueing on CPU 0.
 749          */
 750         ret = queue_work_on(0, queue, &dpc->work);
 751
 752         if (!ret) {
 753                 printk(KERN_ERR PREFIX
 754                           "Call to queue_work() failed.\n");
 755                 status = AE_ERROR;
 756                 kfree(dpc);
 757         }
 758         return status;
 759 }
 760
 761 acpi_status acpi_os_execute(acpi_execute_type type,
 762                             acpi_osd_exec_callback function, void *context)
 763 {
 764         return __acpi_os_execute(type, function, context, 0);
 765 }
 766 EXPORT_SYMBOL(acpi_os_execute);
 767
 768 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 769         void *context)
 770 {
 771         return __acpi_os_execute(0, function, context, 1);
 772 }
 773
 774 void acpi_os_wait_events_complete(void *context)
 775 {
 776         flush_workqueue(kacpid_wq);
 777         flush_workqueue(kacpi_notify_wq);
 778 }
 779
 780 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 781
 782 /*
 783  * Deallocate the memory for a spinlock.
 784  */
 785 void acpi_os_delete_lock(acpi_spinlock handle)
 786 {
 787         return;
 788 }
 789
 790 acpi_status
 791 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 792 {
 793         struct semaphore *sem = NULL;
 794
 795         sem = acpi_os_allocate(sizeof(struct semaphore));
 796         if (!sem)
 797                 return AE_NO_MEMORY;
 798         memset(sem, 0, sizeof(struct semaphore));
 799
 800         sema_init(sem, initial_units);
 801
 802         *handle = (acpi_handle *) sem;
 803
 804         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 805                           *handle, initial_units));
 806
 807         return AE_OK;
 808 }
 809
 810 /*
 811  * TODO: A better way to delete semaphores?  Linux doesn't have a
 812  * 'delete_semaphore()' function -- may result in an invalid
 813  * pointer dereference for non-synchronized consumers.  Should
 814  * we at least check for blocked threads and signal/cancel them?
 815  */
 816
 817 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 818 {
 819         struct semaphore *sem = (struct semaphore *)handle;
 820
 821         if (!sem)
 822                 return AE_BAD_PARAMETER;
 823
 824         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 825
 826         BUG_ON(!list_empty(&sem->wait_list));
 827         kfree(sem);
 828         sem = NULL;
 829
 830         return AE_OK;
 831 }
 832
 833 /*
 834  * TODO: Support for units > 1?
 835  */
 836 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 837 {
 838         acpi_status status = AE_OK;
 839         struct semaphore *sem = (struct semaphore *)handle;
 840         long jiffies;
 841         int ret = 0;
 842
 843         if (!sem || (units < 1))
 844                 return AE_BAD_PARAMETER;
 845
 846         if (units > 1)
 847                 return AE_SUPPORT;
 848
 849         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 850                           handle, units, timeout));
 851
 852         if (timeout == ACPI_WAIT_FOREVER)
 853                 jiffies = MAX_SCHEDULE_TIMEOUT;
 854         else
 855                 jiffies = msecs_to_jiffies(timeout);
 856
 857         ret = down_timeout(sem, jiffies);
 858         if (ret)
 859                 status = AE_TIME;
 860
 861         if (ACPI_FAILURE(status)) {
 862                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 863                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 864                                   handle, units, timeout,
 865                                   acpi_format_exception(status)));
 866         } else {
 867                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 868                                   "Acquired semaphore[%p|%d|%d]", handle,
 869                                   units, timeout));
 870         }
 871
 872         return status;
 873 }
 874
 875 /*
 876  * TODO: Support for units > 1?
 877  */
 878 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 879 {
 880         struct semaphore *sem = (struct semaphore *)handle;
 881
 882         if (!sem || (units < 1))
 883                 return AE_BAD_PARAMETER;
 884
 885         if (units > 1)
 886                 return AE_SUPPORT;
 887
 888         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 889                           units));
 890
 891         up(sem);
 892
 893         return AE_OK;
 894 }
 895
 896 #ifdef ACPI_FUTURE_USAGE
 897 u32 acpi_os_get_line(char *buffer)
 898 {
 899
 900 #ifdef ENABLE_DEBUGGER
 901         if (acpi_in_debugger) {
 902                 u32 chars;
 903
 904                 kdb_read(buffer, sizeof(line_buf));
 905
 906                 /* remove the CR kdb includes */
 907                 chars = strlen(buffer) - 1;
 908                 buffer[chars] = '\0';
 909         }
 910 #endif
 911
 912         return 0;
 913 }
 914 #endif                          /*  ACPI_FUTURE_USAGE  */
 915
 916 acpi_status acpi_os_signal(u32 function, void *info)
 917 {
 918         switch (function) {
 919         case ACPI_SIGNAL_FATAL:
 920                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 921                 break;
 922         case ACPI_SIGNAL_BREAKPOINT:
 923                 /*
 924                  * AML Breakpoint
 925                  * ACPI spec. says to treat it as a NOP unless
 926                  * you are debugging.  So if/when we integrate
 927                  * AML debugger into the kernel debugger its
 928                  * hook will go here.  But until then it is
 929                  * not useful to print anything on breakpoints.
 930                  */
 931                 break;
 932         default:
 933                 break;
 934         }
 935
 936         return AE_OK;
 937 }
 938
 939 static int __init acpi_os_name_setup(char *str)
 940 {
 941         char *p = acpi_os_name;
 942         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 943
 944         if (!str || !*str)
 945                 return 0;
 946
 947         for (; count-- && str && *str; str++) {
 948                 if (isalnum(*str) || *str == ' ' || *str == ':')
 949                         *p++ = *str;
 950                 else if (*str == '\'' || *str == '"')
 951                         continue;
 952                 else
 953                         break;
 954         }
 955         *p = 0;
 956
 957         return 1;
 958
 959 }
 960
 961 __setup("acpi_os_name=", acpi_os_name_setup);
 962
 963 static void __init set_osi_linux(unsigned int enable)
 964 {
 965         if (osi_linux.enable != enable) {
 966                 osi_linux.enable = enable;
 967                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
 968                         enable ? "Add": "Delet");
 969         }
 970         return;
 971 }
 972
 973 static void __init acpi_cmdline_osi_linux(unsigned int enable)
 974 {
 975         osi_linux.cmdline = 1;  /* cmdline set the default */
 976         set_osi_linux(enable);
 977
 978         return;
 979 }
 980
 981 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
 982 {
 983         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
 984
 985         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
 986
 987         if (enable == -1)
 988                 return;
 989
 990         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
 991
 992         set_osi_linux(enable);
 993
 994         return;
 995 }
 996
 997 /*
 998  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 999  *
1000  * empty string disables _OSI
1001  * string starting with '!' disables that string
1002  * otherwise string is added to list, augmenting built-in strings
1003  */
1004 int __init acpi_osi_setup(char *str)
1005 {
1006         if (str == NULL || *str == '\0') {
1007                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1008                 acpi_gbl_create_osi_method = FALSE;
1009         } else if (!strcmp("!Linux", str)) {
1010                 acpi_cmdline_osi_linux(0);      /* !enable */
1011         } else if (*str == '!') {
1012                 if (acpi_osi_invalidate(++str) == AE_OK)
1013                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1014         } else if (!strcmp("Linux", str)) {
1015                 acpi_cmdline_osi_linux(1);      /* enable */
1016         } else if (*osi_additional_string == '\0') {
1017                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1018                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1019         }
1020
1021         return 1;
1022 }
1023
1024 __setup("acpi_osi=", acpi_osi_setup);
1025
1026 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1027 static int __init acpi_serialize_setup(char *str)
1028 {
1029         printk(KERN_INFO PREFIX "serialize enabled\n");
1030
1031         acpi_gbl_all_methods_serialized = TRUE;
1032
1033         return 1;
1034 }
1035
1036 __setup("acpi_serialize", acpi_serialize_setup);
1037
1038 /* Check of resource interference between native drivers and ACPI
1039  * OperationRegions (SystemIO and System Memory only).
1040  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1041  * in arbitrary AML code and can interfere with legacy drivers.
1042  * acpi_enforce_resources= can be set to:
1043  *
1044  *   - strict (default) (2)
1045  *     -> further driver trying to access the resources will not load
1046  *   - lax              (1)
1047  *     -> further driver trying to access the resources will load, but you
1048  *     get a system message that something might go wrong...
1049  *
1050  *   - no               (0)
1051  *     -> ACPI Operation Region resources will not be registered
1052  *
1053  */
1054 #define ENFORCE_RESOURCES_STRICT 2
1055 #define ENFORCE_RESOURCES_LAX    1
1056 #define ENFORCE_RESOURCES_NO     0
1057
1058 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1059
1060 static int __init acpi_enforce_resources_setup(char *str)
1061 {
1062         if (str == NULL || *str == '\0')
1063                 return 0;
1064
1065         if (!strcmp("strict", str))
1066                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1067         else if (!strcmp("lax", str))
1068                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1069         else if (!strcmp("no", str))
1070                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1071
1072         return 1;
1073 }
1074
1075 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1076
1077 /* Check for resource conflicts between ACPI OperationRegions and native
1078  * drivers */
1079 int acpi_check_resource_conflict(const struct resource *res)
1080 {
1081         struct acpi_res_list *res_list_elem;
1082         int ioport;
1083         int clash = 0;
1084
1085         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1086                 return 0;
1087         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1088                 return 0;
1089
1090         ioport = res->flags & IORESOURCE_IO;
1091
1092         spin_lock(&acpi_res_lock);
1093         list_for_each_entry(res_list_elem, &resource_list_head,
1094                             resource_list) {
1095                 if (ioport && (res_list_elem->resource_type
1096                                != ACPI_ADR_SPACE_SYSTEM_IO))
1097                         continue;
1098                 if (!ioport && (res_list_elem->resource_type
1099                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1100                         continue;
1101
1102                 if (res->end < res_list_elem->start
1103                     || res_list_elem->end < res->start)
1104                         continue;
1105                 clash = 1;
1106                 break;
1107         }
1108         spin_unlock(&acpi_res_lock);
1109
1110         if (clash) {
1111                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1112                         printk(KERN_WARNING "ACPI: resource %s %pR"
1113                                " conflicts with ACPI region %s %pR\n",
1114                                res->name, res, res_list_elem->name,
1115                                res_list_elem);
1116                         if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
1117                                 printk(KERN_NOTICE "ACPI: This conflict may"
1118                                        " cause random problems and system"
1119                                        " instability\n");
1120                         printk(KERN_INFO "ACPI: If an ACPI driver is available"
1121                                " for this device, you should use it instead of"
1122                                " the native driver\n");
1123                 }
1124                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1125                         return -EBUSY;
1126         }
1127         return 0;
1128 }
1129 EXPORT_SYMBOL(acpi_check_resource_conflict);
1130
1131 int acpi_check_region(resource_size_t start, resource_size_t n,
1132                       const char *name)
1133 {
1134         struct resource res = {
1135                 .start = start,
1136                 .end   = start + n - 1,
1137                 .name  = name,
1138                 .flags = IORESOURCE_IO,
1139         };
1140
1141         return acpi_check_resource_conflict(&res);
1142 }
1143 EXPORT_SYMBOL(acpi_check_region);
1144
1145 /*
1146  * Let drivers know whether the resource checks are effective
1147  */
1148 int acpi_resources_are_enforced(void)
1149 {
1150         return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
1151 }
1152 EXPORT_SYMBOL(acpi_resources_are_enforced);
1153
1154 /*
1155  * Acquire a spinlock.
1156  *
1157  * handle is a pointer to the spinlock_t.
1158  */
1159
1160 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1161 {
1162         acpi_cpu_flags flags;
1163         spin_lock_irqsave(lockp, flags);
1164         return flags;
1165 }
1166
1167 /*
1168  * Release a spinlock. See above.
1169  */
1170
1171 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1172 {
1173         spin_unlock_irqrestore(lockp, flags);
1174 }
1175
1176 #ifndef ACPI_USE_LOCAL_CACHE
1177
1178 /*******************************************************************************
1179  *
1180  * FUNCTION:    acpi_os_create_cache
1181  *
1182  * PARAMETERS:  name      - Ascii name for the cache
1183  *              size      - Size of each cached object
1184  *              depth     - Maximum depth of the cache (in objects) <ignored>
1185  *              cache     - Where the new cache object is returned
1186  *
1187  * RETURN:      status
1188  *
1189  * DESCRIPTION: Create a cache object
1190  *
1191  ******************************************************************************/
1192
1193 acpi_status
1194 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1195 {
1196         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1197         if (*cache == NULL)
1198                 return AE_ERROR;
1199         else
1200                 return AE_OK;
1201 }
1202
1203 /*******************************************************************************
1204  *
1205  * FUNCTION:    acpi_os_purge_cache
1206  *
1207  * PARAMETERS:  Cache           - Handle to cache object
1208  *
1209  * RETURN:      Status
1210  *
1211  * DESCRIPTION: Free all objects within the requested cache.
1212  *
1213  ******************************************************************************/
1214
1215 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1216 {
1217         kmem_cache_shrink(cache);
1218         return (AE_OK);
1219 }
1220
1221 /*******************************************************************************
1222  *
1223  * FUNCTION:    acpi_os_delete_cache
1224  *
1225  * PARAMETERS:  Cache           - Handle to cache object
1226  *
1227  * RETURN:      Status
1228  *
1229  * DESCRIPTION: Free all objects within the requested cache and delete the
1230  *              cache object.
1231  *
1232  ******************************************************************************/
1233
1234 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1235 {
1236         kmem_cache_destroy(cache);
1237         return (AE_OK);
1238 }
1239
1240 /*******************************************************************************
1241  *
1242  * FUNCTION:    acpi_os_release_object
1243  *
1244  * PARAMETERS:  Cache       - Handle to cache object
1245  *              Object      - The object to be released
1246  *
1247  * RETURN:      None
1248  *
1249  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1250  *              the object is deleted.
1251  *
1252  ******************************************************************************/
1253
1254 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1255 {
1256         kmem_cache_free(cache, object);
1257         return (AE_OK);
1258 }
1259
1260 /******************************************************************************
1261  *
1262  * FUNCTION:    acpi_os_validate_interface
1263  *
1264  * PARAMETERS:  interface           - Requested interface to be validated
1265  *
1266  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1267  *
1268  * DESCRIPTION: Match an interface string to the interfaces supported by the
1269  *              host. Strings originate from an AML call to the _OSI method.
1270  *
1271  *****************************************************************************/
1272
1273 acpi_status
1274 acpi_os_validate_interface (char *interface)
1275 {
1276         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1277                 return AE_OK;
1278         if (!strcmp("Linux", interface)) {
1279
1280                 printk(KERN_NOTICE PREFIX
1281                         "BIOS _OSI(Linux) query %s%s\n",
1282                         osi_linux.enable ? "honored" : "ignored",
1283                         osi_linux.cmdline ? " via cmdline" :
1284                         osi_linux.dmi ? " via DMI" : "");
1285
1286                 if (osi_linux.enable)
1287                         return AE_OK;
1288         }
1289         return AE_SUPPORT;
1290 }
1291
1292 static inline int acpi_res_list_add(struct acpi_res_list *res)
1293 {
1294         struct acpi_res_list *res_list_elem;
1295
1296         list_for_each_entry(res_list_elem, &resource_list_head,
1297                             resource_list) {
1298
1299                 if (res->resource_type == res_list_elem->resource_type &&
1300                     res->start == res_list_elem->start &&
1301                     res->end == res_list_elem->end) {
1302
1303                         /*
1304                          * The Region(addr,len) already exist in the list,
1305                          * just increase the count
1306                          */
1307
1308                         res_list_elem->count++;
1309                         return 0;
1310                 }
1311         }
1312
1313         res->count = 1;
1314         list_add(&res->resource_list, &resource_list_head);
1315         return 1;
1316 }
1317
1318 static inline void acpi_res_list_del(struct acpi_res_list *res)
1319 {
1320         struct acpi_res_list *res_list_elem;
1321
1322         list_for_each_entry(res_list_elem, &resource_list_head,
1323                             resource_list) {
1324
1325                 if (res->resource_type == res_list_elem->resource_type &&
1326                     res->start == res_list_elem->start &&
1327                     res->end == res_list_elem->end) {
1328
1329                         /*
1330                          * If the res count is decreased to 0,
1331                          * remove and free it
1332                          */
1333
1334                         if (--res_list_elem->count == 0) {
1335                                 list_del(&res_list_elem->resource_list);
1336                                 kfree(res_list_elem);
1337                         }
1338                         return;
1339                 }
1340         }
1341 }
1342
1343 acpi_status
1344 acpi_os_invalidate_address(
1345     u8                   space_id,
1346     acpi_physical_address   address,
1347     acpi_size               length)
1348 {
1349         struct acpi_res_list res;
1350
1351         switch (space_id) {
1352         case ACPI_ADR_SPACE_SYSTEM_IO:
1353         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1354                 /* Only interference checks against SystemIO and SystemMemory
1355                    are needed */
1356                 res.start = address;
1357                 res.end = address + length - 1;
1358                 res.resource_type = space_id;
1359                 spin_lock(&acpi_res_lock);
1360                 acpi_res_list_del(&res);
1361                 spin_unlock(&acpi_res_lock);
1362                 break;
1363         case ACPI_ADR_SPACE_PCI_CONFIG:
1364         case ACPI_ADR_SPACE_EC:
1365         case ACPI_ADR_SPACE_SMBUS:
1366         case ACPI_ADR_SPACE_CMOS:
1367         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1368         case ACPI_ADR_SPACE_DATA_TABLE:
1369         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1370                 break;
1371         }
1372         return AE_OK;
1373 }
1374
1375 /******************************************************************************
1376  *
1377  * FUNCTION:    acpi_os_validate_address
1378  *
1379  * PARAMETERS:  space_id             - ACPI space ID
1380  *              address             - Physical address
1381  *              length              - Address length
1382  *
1383  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1384  *              should return AE_AML_ILLEGAL_ADDRESS.
1385  *
1386  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1387  *              the addresses accessed by AML operation regions.
1388  *
1389  *****************************************************************************/
1390
1391 acpi_status
1392 acpi_os_validate_address (
1393     u8                   space_id,
1394     acpi_physical_address   address,
1395     acpi_size               length,
1396     char *name)
1397 {
1398         struct acpi_res_list *res;
1399         int added;
1400         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1401                 return AE_OK;
1402
1403         switch (space_id) {
1404         case ACPI_ADR_SPACE_SYSTEM_IO:
1405         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1406                 /* Only interference checks against SystemIO and SystemMemory
1407                    are needed */
1408                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1409                 if (!res)
1410                         return AE_OK;
1411                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1412                 strlcpy(res->name, name, 5);
1413                 res->start = address;
1414                 res->end = address + length - 1;
1415                 res->resource_type = space_id;
1416                 spin_lock(&acpi_res_lock);
1417                 added = acpi_res_list_add(res);
1418                 spin_unlock(&acpi_res_lock);
1419                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1420                          "name: %s\n", added ? "Added" : "Already exist",
1421                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1422                          ? "SystemIO" : "System Memory",
1423                          (unsigned long long)res->start,
1424                          (unsigned long long)res->end,
1425                          res->name);
1426                 if (!added)
1427                         kfree(res);
1428                 break;
1429         case ACPI_ADR_SPACE_PCI_CONFIG:
1430         case ACPI_ADR_SPACE_EC:
1431         case ACPI_ADR_SPACE_SMBUS:
1432         case ACPI_ADR_SPACE_CMOS:
1433         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1434         case ACPI_ADR_SPACE_DATA_TABLE:
1435         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1436                 break;
1437         }
1438         return AE_OK;
1439 }
1440
1441 #endif