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 };
  62
  63 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  64 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  65 #endif
  66
  67 #ifdef ENABLE_DEBUGGER
  68 #include <linux/kdb.h>
  69
  70 /* stuff for debugger support */
  71 int acpi_in_debugger;
  72 EXPORT_SYMBOL(acpi_in_debugger);
  73
  74 extern char line_buf[80];
  75 #endif                          /*ENABLE_DEBUGGER */
  76
  77 static unsigned int acpi_irq_irq;
  78 static acpi_osd_handler acpi_irq_handler;
  79 static void *acpi_irq_context;
  80 static struct workqueue_struct *kacpid_wq;
  81 static struct workqueue_struct *kacpi_notify_wq;
  82
  83 struct acpi_res_list {
  84         resource_size_t start;
  85         resource_size_t end;
  86         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  87         char name[5];   /* only can have a length of 4 chars, make use of this
  88                            one instead of res->name, no need to kalloc then */
  89         struct list_head resource_list;
  90 };
  91
  92 static LIST_HEAD(resource_list_head);
  93 static DEFINE_SPINLOCK(acpi_res_lock);
  94
  95 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  96 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  97
  98 /*
  99  * The story of _OSI(Linux)
 100  *
 101  * From pre-history through Linux-2.6.22,
 102  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 103  *
 104  * Unfortunately, reference BIOS writers got wind of this
 105  * and put OSI(Linux) in their example code, quickly exposing
 106  * this string as ill-conceived and opening the door to
 107  * an un-bounded number of BIOS incompatibilities.
 108  *
 109  * For example, OSI(Linux) was used on resume to re-POST a
 110  * video card on one system, because Linux at that time
 111  * could not do a speedy restore in its native driver.
 112  * But then upon gaining quick native restore capability,
 113  * Linux has no way to tell the BIOS to skip the time-consuming
 114  * POST -- putting Linux at a permanent performance disadvantage.
 115  * On another system, the BIOS writer used OSI(Linux)
 116  * to infer native OS support for IPMI!  On other systems,
 117  * OSI(Linux) simply got in the way of Linux claiming to
 118  * be compatible with other operating systems, exposing
 119  * BIOS issues such as skipped device initialization.
 120  *
 121  * So "Linux" turned out to be a really poor chose of
 122  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 123  *
 124  * BIOS writers should NOT query _OSI(Linux) on future systems.
 125  * Linux will complain on the console when it sees it, and return FALSE.
 126  * To get Linux to return TRUE for your system  will require
 127  * a kernel source update to add a DMI entry,
 128  * or boot with "acpi_osi=Linux"
 129  */
 130
 131 static struct osi_linux {
 132         unsigned int    enable:1;
 133         unsigned int    dmi:1;
 134         unsigned int    cmdline:1;
 135         unsigned int    known:1;
 136 } osi_linux = { 0, 0, 0, 0};
 137
 138 static void __init acpi_request_region (struct acpi_generic_address *addr,
 139         unsigned int length, char *desc)
 140 {
 141         struct resource *res;
 142
 143         if (!addr->address || !length)
 144                 return;
 145
 146         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 147                 res = request_region(addr->address, length, desc);
 148         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 149                 res = request_mem_region(addr->address, length, desc);
 150 }
 151
 152 static int __init acpi_reserve_resources(void)
 153 {
 154         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 155                 "ACPI PM1a_EVT_BLK");
 156
 157         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 158                 "ACPI PM1b_EVT_BLK");
 159
 160         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 161                 "ACPI PM1a_CNT_BLK");
 162
 163         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 164                 "ACPI PM1b_CNT_BLK");
 165
 166         if (acpi_gbl_FADT.pm_timer_length == 4)
 167                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 168
 169         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 170                 "ACPI PM2_CNT_BLK");
 171
 172         /* Length of GPE blocks must be a non-negative multiple of 2 */
 173
 174         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 175                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 176                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 177
 178         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 179                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 180                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 181
 182         return 0;
 183 }
 184 device_initcall(acpi_reserve_resources);
 185
 186 acpi_status __init acpi_os_initialize(void)
 187 {
 188         return AE_OK;
 189 }
 190
 191 acpi_status acpi_os_initialize1(void)
 192 {
 193         kacpid_wq = create_singlethread_workqueue("kacpid");
 194         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 195         BUG_ON(!kacpid_wq);
 196         BUG_ON(!kacpi_notify_wq);
 197         return AE_OK;
 198 }
 199
 200 acpi_status acpi_os_terminate(void)
 201 {
 202         if (acpi_irq_handler) {
 203                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 204                                                  acpi_irq_handler);
 205         }
 206
 207         destroy_workqueue(kacpid_wq);
 208         destroy_workqueue(kacpi_notify_wq);
 209
 210         return AE_OK;
 211 }
 212
 213 void acpi_os_printf(const char *fmt, ...)
 214 {
 215         va_list args;
 216         va_start(args, fmt);
 217         acpi_os_vprintf(fmt, args);
 218         va_end(args);
 219 }
 220
 221 void acpi_os_vprintf(const char *fmt, va_list args)
 222 {
 223         static char buffer[512];
 224
 225         vsprintf(buffer, fmt, args);
 226
 227 #ifdef ENABLE_DEBUGGER
 228         if (acpi_in_debugger) {
 229                 kdb_printf("%s", buffer);
 230         } else {
 231                 printk(KERN_CONT "%s", buffer);
 232         }
 233 #else
 234         printk(KERN_CONT "%s", buffer);
 235 #endif
 236 }
 237
 238 acpi_physical_address __init acpi_os_get_root_pointer(void)
 239 {
 240         if (efi_enabled) {
 241                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 242                         return efi.acpi20;
 243                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 244                         return efi.acpi;
 245                 else {
 246                         printk(KERN_ERR PREFIX
 247                                "System description tables not found\n");
 248                         return 0;
 249                 }
 250         } else {
 251                 acpi_physical_address pa = 0;
 252
 253                 acpi_find_root_pointer(&pa);
 254                 return pa;
 255         }
 256 }
 257
 258 void __iomem *__init_refok
 259 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 260 {
 261         if (phys > ULONG_MAX) {
 262                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 263                 return NULL;
 264         }
 265         if (acpi_gbl_permanent_mmap)
 266                 /*
 267                 * ioremap checks to ensure this is in reserved space
 268                 */
 269                 return ioremap((unsigned long)phys, size);
 270         else
 271                 return __acpi_map_table((unsigned long)phys, size);
 272 }
 273 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 274
 275 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 276 {
 277         if (acpi_gbl_permanent_mmap)
 278                 iounmap(virt);
 279         else
 280                 __acpi_unmap_table(virt, size);
 281 }
 282 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 283
 284 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 285 {
 286         if (!acpi_gbl_permanent_mmap)
 287                 __acpi_unmap_table(virt, size);
 288 }
 289
 290 #ifdef ACPI_FUTURE_USAGE
 291 acpi_status
 292 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 293 {
 294         if (!phys || !virt)
 295                 return AE_BAD_PARAMETER;
 296
 297         *phys = virt_to_phys(virt);
 298
 299         return AE_OK;
 300 }
 301 #endif
 302
 303 #define ACPI_MAX_OVERRIDE_LEN 100
 304
 305 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 306
 307 acpi_status
 308 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 309                             acpi_string * new_val)
 310 {
 311         if (!init_val || !new_val)
 312                 return AE_BAD_PARAMETER;
 313
 314         *new_val = NULL;
 315         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 316                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 317                        acpi_os_name);
 318                 *new_val = acpi_os_name;
 319         }
 320
 321         return AE_OK;
 322 }
 323
 324 acpi_status
 325 acpi_os_table_override(struct acpi_table_header * existing_table,
 326                        struct acpi_table_header ** new_table)
 327 {
 328         if (!existing_table || !new_table)
 329                 return AE_BAD_PARAMETER;
 330
 331         *new_table = NULL;
 332
 333 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 334         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 335                 *new_table = (struct acpi_table_header *)AmlCode;
 336 #endif
 337         if (*new_table != NULL) {
 338                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 339                            "this is unsafe: tainting kernel\n",
 340                        existing_table->signature,
 341                        existing_table->oem_table_id);
 342                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 343         }
 344         return AE_OK;
 345 }
 346
 347 static irqreturn_t acpi_irq(int irq, void *dev_id)
 348 {
 349         u32 handled;
 350
 351         handled = (*acpi_irq_handler) (acpi_irq_context);
 352
 353         if (handled) {
 354                 acpi_irq_handled++;
 355                 return IRQ_HANDLED;
 356         } else
 357                 return IRQ_NONE;
 358 }
 359
 360 acpi_status
 361 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 362                                   void *context)
 363 {
 364         unsigned int irq;
 365
 366         acpi_irq_stats_init();
 367
 368         /*
 369          * Ignore the GSI from the core, and use the value in our copy of the
 370          * FADT. It may not be the same if an interrupt source override exists
 371          * for the SCI.
 372          */
 373         gsi = acpi_gbl_FADT.sci_interrupt;
 374         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 375                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 376                        gsi);
 377                 return AE_OK;
 378         }
 379
 380         acpi_irq_handler = handler;
 381         acpi_irq_context = context;
 382         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 383                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 384                 return AE_NOT_ACQUIRED;
 385         }
 386         acpi_irq_irq = irq;
 387
 388         return AE_OK;
 389 }
 390
 391 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 392 {
 393         if (irq) {
 394                 free_irq(irq, acpi_irq);
 395                 acpi_irq_handler = NULL;
 396                 acpi_irq_irq = 0;
 397         }
 398
 399         return AE_OK;
 400 }
 401
 402 /*
 403  * Running in interpreter thread context, safe to sleep
 404  */
 405
 406 void acpi_os_sleep(acpi_integer ms)
 407 {
 408         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 409 }
 410
 411 void acpi_os_stall(u32 us)
 412 {
 413         while (us) {
 414                 u32 delay = 1000;
 415
 416                 if (delay > us)
 417                         delay = us;
 418                 udelay(delay);
 419                 touch_nmi_watchdog();
 420                 us -= delay;
 421         }
 422 }
 423
 424 /*
 425  * Support ACPI 3.0 AML Timer operand
 426  * Returns 64-bit free-running, monotonically increasing timer
 427  * with 100ns granularity
 428  */
 429 u64 acpi_os_get_timer(void)
 430 {
 431         static u64 t;
 432
 433 #ifdef  CONFIG_HPET
 434         /* TBD: use HPET if available */
 435 #endif
 436
 437 #ifdef  CONFIG_X86_PM_TIMER
 438         /* TBD: default to PM timer if HPET was not available */
 439 #endif
 440         if (!t)
 441                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 442
 443         return ++t;
 444 }
 445
 446 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 447 {
 448         u32 dummy;
 449
 450         if (!value)
 451                 value = &dummy;
 452
 453         *value = 0;
 454         if (width <= 8) {
 455                 *(u8 *) value = inb(port);
 456         } else if (width <= 16) {
 457                 *(u16 *) value = inw(port);
 458         } else if (width <= 32) {
 459                 *(u32 *) value = inl(port);
 460         } else {
 461                 BUG();
 462         }
 463
 464         return AE_OK;
 465 }
 466
 467 EXPORT_SYMBOL(acpi_os_read_port);
 468
 469 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 470 {
 471         if (width <= 8) {
 472                 outb(value, port);
 473         } else if (width <= 16) {
 474                 outw(value, port);
 475         } else if (width <= 32) {
 476                 outl(value, port);
 477         } else {
 478                 BUG();
 479         }
 480
 481         return AE_OK;
 482 }
 483
 484 EXPORT_SYMBOL(acpi_os_write_port);
 485
 486 acpi_status
 487 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 488 {
 489         u32 dummy;
 490         void __iomem *virt_addr;
 491
 492         virt_addr = ioremap(phys_addr, width);
 493         if (!value)
 494                 value = &dummy;
 495
 496         switch (width) {
 497         case 8:
 498                 *(u8 *) value = readb(virt_addr);
 499                 break;
 500         case 16:
 501                 *(u16 *) value = readw(virt_addr);
 502                 break;
 503         case 32:
 504                 *(u32 *) value = readl(virt_addr);
 505                 break;
 506         default:
 507                 BUG();
 508         }
 509
 510         iounmap(virt_addr);
 511
 512         return AE_OK;
 513 }
 514
 515 acpi_status
 516 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 517 {
 518         void __iomem *virt_addr;
 519
 520         virt_addr = ioremap(phys_addr, width);
 521
 522         switch (width) {
 523         case 8:
 524                 writeb(value, virt_addr);
 525                 break;
 526         case 16:
 527                 writew(value, virt_addr);
 528                 break;
 529         case 32:
 530                 writel(value, virt_addr);
 531                 break;
 532         default:
 533                 BUG();
 534         }
 535
 536         iounmap(virt_addr);
 537
 538         return AE_OK;
 539 }
 540
 541 acpi_status
 542 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 543                                u32 *value, u32 width)
 544 {
 545         int result, size;
 546
 547         if (!value)
 548                 return AE_BAD_PARAMETER;
 549
 550         switch (width) {
 551         case 8:
 552                 size = 1;
 553                 break;
 554         case 16:
 555                 size = 2;
 556                 break;
 557         case 32:
 558                 size = 4;
 559                 break;
 560         default:
 561                 return AE_ERROR;
 562         }
 563
 564         result = raw_pci_read(pci_id->segment, pci_id->bus,
 565                                 PCI_DEVFN(pci_id->device, pci_id->function),
 566                                 reg, size, value);
 567
 568         return (result ? AE_ERROR : AE_OK);
 569 }
 570
 571 acpi_status
 572 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 573                                 acpi_integer value, u32 width)
 574 {
 575         int result, size;
 576
 577         switch (width) {
 578         case 8:
 579                 size = 1;
 580                 break;
 581         case 16:
 582                 size = 2;
 583                 break;
 584         case 32:
 585                 size = 4;
 586                 break;
 587         default:
 588                 return AE_ERROR;
 589         }
 590
 591         result = raw_pci_write(pci_id->segment, pci_id->bus,
 592                                 PCI_DEVFN(pci_id->device, pci_id->function),
 593                                 reg, size, value);
 594
 595         return (result ? AE_ERROR : AE_OK);
 596 }
 597
 598 /* TODO: Change code to take advantage of driver model more */
 599 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 600                                     acpi_handle chandle,        /* current node */
 601                                     struct acpi_pci_id **id,
 602                                     int *is_bridge, u8 * bus_number)
 603 {
 604         acpi_handle handle;
 605         struct acpi_pci_id *pci_id = *id;
 606         acpi_status status;
 607         unsigned long long temp;
 608         acpi_object_type type;
 609
 610         acpi_get_parent(chandle, &handle);
 611         if (handle != rhandle) {
 612                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 613                                         bus_number);
 614
 615                 status = acpi_get_type(handle, &type);
 616                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 617                         return;
 618
 619                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 620                                           &temp);
 621                 if (ACPI_SUCCESS(status)) {
 622                         u32 val;
 623                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 624                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 625
 626                         if (*is_bridge)
 627                                 pci_id->bus = *bus_number;
 628
 629                         /* any nicer way to get bus number of bridge ? */
 630                         status =
 631                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 632                                                            8);
 633                         if (ACPI_SUCCESS(status)
 634                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 635                                 status =
 636                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 637                                                                    &val, 8);
 638                                 if (!ACPI_SUCCESS(status)) {
 639                                         /* Certainly broken...  FIX ME */
 640                                         return;
 641                                 }
 642                                 *is_bridge = 1;
 643                                 pci_id->bus = val;
 644                                 status =
 645                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 646                                                                    &val, 8);
 647                                 if (ACPI_SUCCESS(status)) {
 648                                         *bus_number = val;
 649                                 }
 650                         } else
 651                                 *is_bridge = 0;
 652                 }
 653         }
 654 }
 655
 656 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 657                            acpi_handle chandle, /* current node */
 658                            struct acpi_pci_id **id)
 659 {
 660         int is_bridge = 1;
 661         u8 bus_number = (*id)->bus;
 662
 663         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 664 }
 665
 666 static void acpi_os_execute_deferred(struct work_struct *work)
 667 {
 668         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 669         if (!dpc) {
 670                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 671                 return;
 672         }
 673
 674         dpc->function(dpc->context);
 675         kfree(dpc);
 676
 677         return;
 678 }
 679
 680 static void acpi_os_execute_hp_deferred(struct work_struct *work)
 681 {
 682         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 683         if (!dpc) {
 684                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 685                 return;
 686         }
 687
 688         acpi_os_wait_events_complete(NULL);
 689
 690         dpc->function(dpc->context);
 691         kfree(dpc);
 692
 693         return;
 694 }
 695
 696 /*******************************************************************************
 697  *
 698  * FUNCTION:    acpi_os_execute
 699  *
 700  * PARAMETERS:  Type               - Type of the callback
 701  *              Function           - Function to be executed
 702  *              Context            - Function parameters
 703  *
 704  * RETURN:      Status
 705  *
 706  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 707  *              immediately executes function on a separate thread.
 708  *
 709  ******************************************************************************/
 710
 711 static acpi_status __acpi_os_execute(acpi_execute_type type,
 712         acpi_osd_exec_callback function, void *context, int hp)
 713 {
 714         acpi_status status = AE_OK;
 715         struct acpi_os_dpc *dpc;
 716         struct workqueue_struct *queue;
 717         int ret;
 718         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 719                           "Scheduling function [%p(%p)] for deferred execution.\n",
 720                           function, context));
 721
 722         if (!function)
 723                 return AE_BAD_PARAMETER;
 724
 725         /*
 726          * Allocate/initialize DPC structure.  Note that this memory will be
 727          * freed by the callee.  The kernel handles the work_struct list  in a
 728          * way that allows us to also free its memory inside the callee.
 729          * Because we may want to schedule several tasks with different
 730          * parameters we can't use the approach some kernel code uses of
 731          * having a static work_struct.
 732          */
 733
 734         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 735         if (!dpc)
 736                 return AE_NO_MEMORY;
 737
 738         dpc->function = function;
 739         dpc->context = context;
 740
 741         if (!hp) {
 742                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 743                 queue = (type == OSL_NOTIFY_HANDLER) ?
 744                         kacpi_notify_wq : kacpid_wq;
 745                 ret = queue_work(queue, &dpc->work);
 746         } else {
 747                 INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred);
 748                 ret = schedule_work(&dpc->work);
 749         }
 750
 751         if (!ret) {
 752                 printk(KERN_ERR PREFIX
 753                           "Call to queue_work() failed.\n");
 754                 status = AE_ERROR;
 755                 kfree(dpc);
 756         }
 757         return status;
 758 }
 759
 760 acpi_status acpi_os_execute(acpi_execute_type type,
 761                             acpi_osd_exec_callback function, void *context)
 762 {
 763         return __acpi_os_execute(type, function, context, 0);
 764 }
 765 EXPORT_SYMBOL(acpi_os_execute);
 766
 767 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 768         void *context)
 769 {
 770         return __acpi_os_execute(0, function, context, 1);
 771 }
 772
 773 void acpi_os_wait_events_complete(void *context)
 774 {
 775         flush_workqueue(kacpid_wq);
 776         flush_workqueue(kacpi_notify_wq);
 777 }
 778
 779 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 780
 781 /*
 782  * Allocate the memory for a spinlock and initialize it.
 783  */
 784 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 785 {
 786         spin_lock_init(*handle);
 787
 788         return AE_OK;
 789 }
 790
 791 /*
 792  * Deallocate the memory for a spinlock.
 793  */
 794 void acpi_os_delete_lock(acpi_spinlock handle)
 795 {
 796         return;
 797 }
 798
 799 acpi_status
 800 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 801 {
 802         struct semaphore *sem = NULL;
 803
 804         sem = acpi_os_allocate(sizeof(struct semaphore));
 805         if (!sem)
 806                 return AE_NO_MEMORY;
 807         memset(sem, 0, sizeof(struct semaphore));
 808
 809         sema_init(sem, initial_units);
 810
 811         *handle = (acpi_handle *) sem;
 812
 813         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 814                           *handle, initial_units));
 815
 816         return AE_OK;
 817 }
 818
 819 /*
 820  * TODO: A better way to delete semaphores?  Linux doesn't have a
 821  * 'delete_semaphore()' function -- may result in an invalid
 822  * pointer dereference for non-synchronized consumers.  Should
 823  * we at least check for blocked threads and signal/cancel them?
 824  */
 825
 826 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 827 {
 828         struct semaphore *sem = (struct semaphore *)handle;
 829
 830         if (!sem)
 831                 return AE_BAD_PARAMETER;
 832
 833         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 834
 835         BUG_ON(!list_empty(&sem->wait_list));
 836         kfree(sem);
 837         sem = NULL;
 838
 839         return AE_OK;
 840 }
 841
 842 /*
 843  * TODO: Support for units > 1?
 844  */
 845 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 846 {
 847         acpi_status status = AE_OK;
 848         struct semaphore *sem = (struct semaphore *)handle;
 849         long jiffies;
 850         int ret = 0;
 851
 852         if (!sem || (units < 1))
 853                 return AE_BAD_PARAMETER;
 854
 855         if (units > 1)
 856                 return AE_SUPPORT;
 857
 858         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 859                           handle, units, timeout));
 860
 861         if (timeout == ACPI_WAIT_FOREVER)
 862                 jiffies = MAX_SCHEDULE_TIMEOUT;
 863         else
 864                 jiffies = msecs_to_jiffies(timeout);
 865
 866         ret = down_timeout(sem, jiffies);
 867         if (ret)
 868                 status = AE_TIME;
 869
 870         if (ACPI_FAILURE(status)) {
 871                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 872                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 873                                   handle, units, timeout,
 874                                   acpi_format_exception(status)));
 875         } else {
 876                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 877                                   "Acquired semaphore[%p|%d|%d]", handle,
 878                                   units, timeout));
 879         }
 880
 881         return status;
 882 }
 883
 884 /*
 885  * TODO: Support for units > 1?
 886  */
 887 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 888 {
 889         struct semaphore *sem = (struct semaphore *)handle;
 890
 891         if (!sem || (units < 1))
 892                 return AE_BAD_PARAMETER;
 893
 894         if (units > 1)
 895                 return AE_SUPPORT;
 896
 897         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 898                           units));
 899
 900         up(sem);
 901
 902         return AE_OK;
 903 }
 904
 905 #ifdef ACPI_FUTURE_USAGE
 906 u32 acpi_os_get_line(char *buffer)
 907 {
 908
 909 #ifdef ENABLE_DEBUGGER
 910         if (acpi_in_debugger) {
 911                 u32 chars;
 912
 913                 kdb_read(buffer, sizeof(line_buf));
 914
 915                 /* remove the CR kdb includes */
 916                 chars = strlen(buffer) - 1;
 917                 buffer[chars] = '\0';
 918         }
 919 #endif
 920
 921         return 0;
 922 }
 923 #endif                          /*  ACPI_FUTURE_USAGE  */
 924
 925 acpi_status acpi_os_signal(u32 function, void *info)
 926 {
 927         switch (function) {
 928         case ACPI_SIGNAL_FATAL:
 929                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 930                 break;
 931         case ACPI_SIGNAL_BREAKPOINT:
 932                 /*
 933                  * AML Breakpoint
 934                  * ACPI spec. says to treat it as a NOP unless
 935                  * you are debugging.  So if/when we integrate
 936                  * AML debugger into the kernel debugger its
 937                  * hook will go here.  But until then it is
 938                  * not useful to print anything on breakpoints.
 939                  */
 940                 break;
 941         default:
 942                 break;
 943         }
 944
 945         return AE_OK;
 946 }
 947
 948 static int __init acpi_os_name_setup(char *str)
 949 {
 950         char *p = acpi_os_name;
 951         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 952
 953         if (!str || !*str)
 954                 return 0;
 955
 956         for (; count-- && str && *str; str++) {
 957                 if (isalnum(*str) || *str == ' ' || *str == ':')
 958                         *p++ = *str;
 959                 else if (*str == '\'' || *str == '"')
 960                         continue;
 961                 else
 962                         break;
 963         }
 964         *p = 0;
 965
 966         return 1;
 967
 968 }
 969
 970 __setup("acpi_os_name=", acpi_os_name_setup);
 971
 972 static void __init set_osi_linux(unsigned int enable)
 973 {
 974         if (osi_linux.enable != enable) {
 975                 osi_linux.enable = enable;
 976                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
 977                         enable ? "Add": "Delet");
 978         }
 979         return;
 980 }
 981
 982 static void __init acpi_cmdline_osi_linux(unsigned int enable)
 983 {
 984         osi_linux.cmdline = 1;  /* cmdline set the default */
 985         set_osi_linux(enable);
 986
 987         return;
 988 }
 989
 990 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
 991 {
 992         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
 993
 994         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
 995
 996         if (enable == -1)
 997                 return;
 998
 999         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1000
1001         set_osi_linux(enable);
1002
1003         return;
1004 }
1005
1006 /*
1007  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1008  *
1009  * empty string disables _OSI
1010  * string starting with '!' disables that string
1011  * otherwise string is added to list, augmenting built-in strings
1012  */
1013 int __init acpi_osi_setup(char *str)
1014 {
1015         if (str == NULL || *str == '\0') {
1016                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1017                 acpi_gbl_create_osi_method = FALSE;
1018         } else if (!strcmp("!Linux", str)) {
1019                 acpi_cmdline_osi_linux(0);      /* !enable */
1020         } else if (*str == '!') {
1021                 if (acpi_osi_invalidate(++str) == AE_OK)
1022                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1023         } else if (!strcmp("Linux", str)) {
1024                 acpi_cmdline_osi_linux(1);      /* enable */
1025         } else if (*osi_additional_string == '\0') {
1026                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1027                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1028         }
1029
1030         return 1;
1031 }
1032
1033 __setup("acpi_osi=", acpi_osi_setup);
1034
1035 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1036 static int __init acpi_serialize_setup(char *str)
1037 {
1038         printk(KERN_INFO PREFIX "serialize enabled\n");
1039
1040         acpi_gbl_all_methods_serialized = TRUE;
1041
1042         return 1;
1043 }
1044
1045 __setup("acpi_serialize", acpi_serialize_setup);
1046
1047 /*
1048  * Wake and Run-Time GPES are expected to be separate.
1049  * We disable wake-GPEs at run-time to prevent spurious
1050  * interrupts.
1051  *
1052  * However, if a system exists that shares Wake and
1053  * Run-time events on the same GPE this flag is available
1054  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1055  */
1056 static int __init acpi_wake_gpes_always_on_setup(char *str)
1057 {
1058         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1059
1060         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1061
1062         return 1;
1063 }
1064
1065 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1066
1067 /* Check of resource interference between native drivers and ACPI
1068  * OperationRegions (SystemIO and System Memory only).
1069  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1070  * in arbitrary AML code and can interfere with legacy drivers.
1071  * acpi_enforce_resources= can be set to:
1072  *
1073  *   - strict           (2)
1074  *     -> further driver trying to access the resources will not load
1075  *   - lax (default)    (1)
1076  *     -> further driver trying to access the resources will load, but you
1077  *     get a system message that something might go wrong...
1078  *
1079  *   - no               (0)
1080  *     -> ACPI Operation Region resources will not be registered
1081  *
1082  */
1083 #define ENFORCE_RESOURCES_STRICT 2
1084 #define ENFORCE_RESOURCES_LAX    1
1085 #define ENFORCE_RESOURCES_NO     0
1086
1087 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1088
1089 static int __init acpi_enforce_resources_setup(char *str)
1090 {
1091         if (str == NULL || *str == '\0')
1092                 return 0;
1093
1094         if (!strcmp("strict", str))
1095                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1096         else if (!strcmp("lax", str))
1097                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1098         else if (!strcmp("no", str))
1099                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1100
1101         return 1;
1102 }
1103
1104 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1105
1106 /* Check for resource conflicts between ACPI OperationRegions and native
1107  * drivers */
1108 int acpi_check_resource_conflict(struct resource *res)
1109 {
1110         struct acpi_res_list *res_list_elem;
1111         int ioport;
1112         int clash = 0;
1113
1114         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1115                 return 0;
1116         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1117                 return 0;
1118
1119         ioport = res->flags & IORESOURCE_IO;
1120
1121         spin_lock(&acpi_res_lock);
1122         list_for_each_entry(res_list_elem, &resource_list_head,
1123                             resource_list) {
1124                 if (ioport && (res_list_elem->resource_type
1125                                != ACPI_ADR_SPACE_SYSTEM_IO))
1126                         continue;
1127                 if (!ioport && (res_list_elem->resource_type
1128                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1129                         continue;
1130
1131                 if (res->end < res_list_elem->start
1132                     || res_list_elem->end < res->start)
1133                         continue;
1134                 clash = 1;
1135                 break;
1136         }
1137         spin_unlock(&acpi_res_lock);
1138
1139         if (clash) {
1140                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1141                         printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1142                                " conflicts with ACPI region %s"
1143                                " [0x%llx-0x%llx]\n",
1144                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1145                                ? KERN_WARNING : KERN_ERR,
1146                                ioport ? "I/O" : "Memory", res->name,
1147                                (long long) res->start, (long long) res->end,
1148                                res_list_elem->name,
1149                                (long long) res_list_elem->start,
1150                                (long long) res_list_elem->end);
1151                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1152                 }
1153                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1154                         return -EBUSY;
1155         }
1156         return 0;
1157 }
1158 EXPORT_SYMBOL(acpi_check_resource_conflict);
1159
1160 int acpi_check_region(resource_size_t start, resource_size_t n,
1161                       const char *name)
1162 {
1163         struct resource res = {
1164                 .start = start,
1165                 .end   = start + n - 1,
1166                 .name  = name,
1167                 .flags = IORESOURCE_IO,
1168         };
1169
1170         return acpi_check_resource_conflict(&res);
1171 }
1172 EXPORT_SYMBOL(acpi_check_region);
1173
1174 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1175                       const char *name)
1176 {
1177         struct resource res = {
1178                 .start = start,
1179                 .end   = start + n - 1,
1180                 .name  = name,
1181                 .flags = IORESOURCE_MEM,
1182         };
1183
1184         return acpi_check_resource_conflict(&res);
1185
1186 }
1187 EXPORT_SYMBOL(acpi_check_mem_region);
1188
1189 /*
1190  * Acquire a spinlock.
1191  *
1192  * handle is a pointer to the spinlock_t.
1193  */
1194
1195 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1196 {
1197         acpi_cpu_flags flags;
1198         spin_lock_irqsave(lockp, flags);
1199         return flags;
1200 }
1201
1202 /*
1203  * Release a spinlock. See above.
1204  */
1205
1206 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1207 {
1208         spin_unlock_irqrestore(lockp, flags);
1209 }
1210
1211 #ifndef ACPI_USE_LOCAL_CACHE
1212
1213 /*******************************************************************************
1214  *
1215  * FUNCTION:    acpi_os_create_cache
1216  *
1217  * PARAMETERS:  name      - Ascii name for the cache
1218  *              size      - Size of each cached object
1219  *              depth     - Maximum depth of the cache (in objects) <ignored>
1220  *              cache     - Where the new cache object is returned
1221  *
1222  * RETURN:      status
1223  *
1224  * DESCRIPTION: Create a cache object
1225  *
1226  ******************************************************************************/
1227
1228 acpi_status
1229 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1230 {
1231         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1232         if (*cache == NULL)
1233                 return AE_ERROR;
1234         else
1235                 return AE_OK;
1236 }
1237
1238 /*******************************************************************************
1239  *
1240  * FUNCTION:    acpi_os_purge_cache
1241  *
1242  * PARAMETERS:  Cache           - Handle to cache object
1243  *
1244  * RETURN:      Status
1245  *
1246  * DESCRIPTION: Free all objects within the requested cache.
1247  *
1248  ******************************************************************************/
1249
1250 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1251 {
1252         kmem_cache_shrink(cache);
1253         return (AE_OK);
1254 }
1255
1256 /*******************************************************************************
1257  *
1258  * FUNCTION:    acpi_os_delete_cache
1259  *
1260  * PARAMETERS:  Cache           - Handle to cache object
1261  *
1262  * RETURN:      Status
1263  *
1264  * DESCRIPTION: Free all objects within the requested cache and delete the
1265  *              cache object.
1266  *
1267  ******************************************************************************/
1268
1269 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1270 {
1271         kmem_cache_destroy(cache);
1272         return (AE_OK);
1273 }
1274
1275 /*******************************************************************************
1276  *
1277  * FUNCTION:    acpi_os_release_object
1278  *
1279  * PARAMETERS:  Cache       - Handle to cache object
1280  *              Object      - The object to be released
1281  *
1282  * RETURN:      None
1283  *
1284  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1285  *              the object is deleted.
1286  *
1287  ******************************************************************************/
1288
1289 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1290 {
1291         kmem_cache_free(cache, object);
1292         return (AE_OK);
1293 }
1294
1295 /******************************************************************************
1296  *
1297  * FUNCTION:    acpi_os_validate_interface
1298  *
1299  * PARAMETERS:  interface           - Requested interface to be validated
1300  *
1301  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1302  *
1303  * DESCRIPTION: Match an interface string to the interfaces supported by the
1304  *              host. Strings originate from an AML call to the _OSI method.
1305  *
1306  *****************************************************************************/
1307
1308 acpi_status
1309 acpi_os_validate_interface (char *interface)
1310 {
1311         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1312                 return AE_OK;
1313         if (!strcmp("Linux", interface)) {
1314
1315                 printk(KERN_NOTICE PREFIX
1316                         "BIOS _OSI(Linux) query %s%s\n",
1317                         osi_linux.enable ? "honored" : "ignored",
1318                         osi_linux.cmdline ? " via cmdline" :
1319                         osi_linux.dmi ? " via DMI" : "");
1320
1321                 if (osi_linux.enable)
1322                         return AE_OK;
1323         }
1324         return AE_SUPPORT;
1325 }
1326
1327 #ifdef  CONFIG_X86
1328
1329 struct aml_port_desc {
1330         uint    start;
1331         uint    end;
1332         char*   name;
1333         char    warned;
1334 };
1335
1336 static struct aml_port_desc aml_invalid_port_list[] = {
1337         {0x20, 0x21, "PIC0", 0},
1338         {0xA0, 0xA1, "PIC1", 0},
1339         {0x4D0, 0x4D1, "ELCR", 0}
1340 };
1341
1342 /*
1343  * valid_aml_io_address()
1344  *
1345  * if valid, return true
1346  * else invalid, warn once, return false
1347  */
1348 static bool valid_aml_io_address(uint address, uint length)
1349 {
1350         int i;
1351         int entries = sizeof(aml_invalid_port_list) / sizeof(struct aml_port_desc);
1352
1353         for (i = 0; i < entries; ++i) {
1354                 if ((address >= aml_invalid_port_list[i].start &&
1355                         address <= aml_invalid_port_list[i].end) ||
1356                         (address + length >= aml_invalid_port_list[i].start &&
1357                         address  + length <= aml_invalid_port_list[i].end))
1358                 {
1359                         if (!aml_invalid_port_list[i].warned)
1360                         {
1361                                 printk(KERN_ERR "ACPI: Denied BIOS AML access"
1362                                         " to invalid port 0x%x+0x%x (%s)\n",
1363                                         address, length,
1364                                         aml_invalid_port_list[i].name);
1365                                 aml_invalid_port_list[i].warned = 1;
1366                         }
1367                         return false;   /* invalid */
1368                 }
1369         }
1370         return true;    /* valid */
1371 }
1372 #else
1373 static inline bool valid_aml_io_address(uint address, uint length) { return true; }
1374 #endif
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         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1400                 return AE_OK;
1401
1402         switch (space_id) {
1403         case ACPI_ADR_SPACE_SYSTEM_IO:
1404                 if (!valid_aml_io_address(address, length))
1405                         return AE_AML_ILLEGAL_ADDRESS;
1406         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1407                 /* Only interference checks against SystemIO and SytemMemory
1408                    are needed */
1409                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1410                 if (!res)
1411                         return AE_OK;
1412                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1413                 strlcpy(res->name, name, 5);
1414                 res->start = address;
1415                 res->end = address + length - 1;
1416                 res->resource_type = space_id;
1417                 spin_lock(&acpi_res_lock);
1418                 list_add(&res->resource_list, &resource_list_head);
1419                 spin_unlock(&acpi_res_lock);
1420                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1421                          "name: %s\n", (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                 break;
1427         case ACPI_ADR_SPACE_PCI_CONFIG:
1428         case ACPI_ADR_SPACE_EC:
1429         case ACPI_ADR_SPACE_SMBUS:
1430         case ACPI_ADR_SPACE_CMOS:
1431         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1432         case ACPI_ADR_SPACE_DATA_TABLE:
1433         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1434                 break;
1435         }
1436         return AE_OK;
1437 }
1438
1439 #endif