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   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *  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/dmi.h>
  39 #include <linux/workqueue.h>
  40 #include <linux/nmi.h>
  41 #include <linux/acpi.h>
  42 #include <linux/efi.h>
  43 #include <linux/ioport.h>
  44 #include <linux/list.h>
  45 #include <linux/jiffies.h>
  46 #include <linux/semaphore.h>
  47
  48 #include <asm/io.h>
  49 #include <asm/uaccess.h>
  50
  51 #include <acpi/acpi.h>
  52 #include <acpi/acpi_bus.h>
  53 #include <acpi/processor.h>
  54
  55 #define _COMPONENT              ACPI_OS_SERVICES
  56 ACPI_MODULE_NAME("osl");
  57 #define PREFIX          "ACPI: "
  58 struct acpi_os_dpc {
  59         acpi_osd_exec_callback function;
  60         void *context;
  61         struct work_struct work;
  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
  84 struct acpi_res_list {
  85         resource_size_t start;
  86         resource_size_t end;
  87         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  88         char name[5];   /* only can have a length of 4 chars, make use of this
  89                            one instead of res->name, no need to kalloc then */
  90         struct list_head resource_list;
  91 };
  92
  93 static LIST_HEAD(resource_list_head);
  94 static DEFINE_SPINLOCK(acpi_res_lock);
  95
  96 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  97 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  98
  99 /*
 100  * "Ode to _OSI(Linux)"
 101  *
 102  * osi_linux -- Control response to BIOS _OSI(Linux) query.
 103  *
 104  * As Linux evolves, the features that it supports change.
 105  * So an OSI string such as "Linux" is not specific enough
 106  * to be useful across multiple versions of Linux.  It
 107  * doesn't identify any particular feature, interface,
 108  * or even any particular version of Linux...
 109  *
 110  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
 111  * to a BIOS _OSI(Linux) query.  When
 112  * a reference mobile BIOS started using it, its use
 113  * started to spread to many vendor platforms.
 114  * As it is not supportable, we need to halt that spread.
 115  *
 116  * Today, most BIOS references to _OSI(Linux) are noise --
 117  * they have no functional effect and are just dead code
 118  * carried over from the reference BIOS.
 119  *
 120  * The next most common case is that _OSI(Linux) harms Linux,
 121  * usually by causing the BIOS to follow paths that are
 122  * not tested during Windows validation.
 123  *
 124  * Finally, there is a short list of platforms
 125  * where OSI(Linux) benefits Linux.
 126  *
 127  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
 128  * DMI is used to disable the dmesg warning about OSI(Linux)
 129  * on platforms where it is known to have no effect.
 130  * But a dmesg warning remains for systems where
 131  * we do not know if OSI(Linux) is good or bad for the system.
 132  * DMI is also used to enable OSI(Linux) for the machines
 133  * that are known to need it.
 134  *
 135  * BIOS writers should NOT query _OSI(Linux) on future systems.
 136  * It will be ignored by default, and to get Linux to
 137  * not ignore it will require a kernel source update to
 138  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
 139  */
 140 #define OSI_LINUX_ENABLE 0
 141
 142 static struct osi_linux {
 143         unsigned int    enable:1;
 144         unsigned int    dmi:1;
 145         unsigned int    cmdline:1;
 146         unsigned int    known:1;
 147 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
 148
 149 static void __init acpi_request_region (struct acpi_generic_address *addr,
 150         unsigned int length, char *desc)
 151 {
 152         struct resource *res;
 153
 154         if (!addr->address || !length)
 155                 return;
 156
 157         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 158                 res = request_region(addr->address, length, desc);
 159         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 160                 res = request_mem_region(addr->address, length, desc);
 161 }
 162
 163 static int __init acpi_reserve_resources(void)
 164 {
 165         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 166                 "ACPI PM1a_EVT_BLK");
 167
 168         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 169                 "ACPI PM1b_EVT_BLK");
 170
 171         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 172                 "ACPI PM1a_CNT_BLK");
 173
 174         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 175                 "ACPI PM1b_CNT_BLK");
 176
 177         if (acpi_gbl_FADT.pm_timer_length == 4)
 178                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 179
 180         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 181                 "ACPI PM2_CNT_BLK");
 182
 183         /* Length of GPE blocks must be a non-negative multiple of 2 */
 184
 185         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 186                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 187                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 188
 189         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 190                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 191                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 192
 193         return 0;
 194 }
 195 device_initcall(acpi_reserve_resources);
 196
 197 acpi_status __init acpi_os_initialize(void)
 198 {
 199         return AE_OK;
 200 }
 201
 202 acpi_status acpi_os_initialize1(void)
 203 {
 204         kacpid_wq = create_singlethread_workqueue("kacpid");
 205         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 206         BUG_ON(!kacpid_wq);
 207         BUG_ON(!kacpi_notify_wq);
 208         return AE_OK;
 209 }
 210
 211 acpi_status acpi_os_terminate(void)
 212 {
 213         if (acpi_irq_handler) {
 214                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 215                                                  acpi_irq_handler);
 216         }
 217
 218         destroy_workqueue(kacpid_wq);
 219         destroy_workqueue(kacpi_notify_wq);
 220
 221         return AE_OK;
 222 }
 223
 224 void acpi_os_printf(const char *fmt, ...)
 225 {
 226         va_list args;
 227         va_start(args, fmt);
 228         acpi_os_vprintf(fmt, args);
 229         va_end(args);
 230 }
 231
 232 void acpi_os_vprintf(const char *fmt, va_list args)
 233 {
 234         static char buffer[512];
 235
 236         vsprintf(buffer, fmt, args);
 237
 238 #ifdef ENABLE_DEBUGGER
 239         if (acpi_in_debugger) {
 240                 kdb_printf("%s", buffer);
 241         } else {
 242                 printk("%s", buffer);
 243         }
 244 #else
 245         printk("%s", buffer);
 246 #endif
 247 }
 248
 249 acpi_physical_address __init acpi_os_get_root_pointer(void)
 250 {
 251         if (efi_enabled) {
 252                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 253                         return efi.acpi20;
 254                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 255                         return efi.acpi;
 256                 else {
 257                         printk(KERN_ERR PREFIX
 258                                "System description tables not found\n");
 259                         return 0;
 260                 }
 261         } else {
 262                 acpi_physical_address pa = 0;
 263
 264                 acpi_find_root_pointer(&pa);
 265                 return pa;
 266         }
 267 }
 268
 269 void __iomem *__init_refok
 270 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 271 {
 272         if (phys > ULONG_MAX) {
 273                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 274                 return NULL;
 275         }
 276         if (acpi_gbl_permanent_mmap)
 277                 /*
 278                 * ioremap checks to ensure this is in reserved space
 279                 */
 280                 return ioremap((unsigned long)phys, size);
 281         else
 282                 return __acpi_map_table((unsigned long)phys, size);
 283 }
 284 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 285
 286 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 287 {
 288         if (acpi_gbl_permanent_mmap) {
 289                 iounmap(virt);
 290         }
 291 }
 292 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 293
 294 #ifdef ACPI_FUTURE_USAGE
 295 acpi_status
 296 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 297 {
 298         if (!phys || !virt)
 299                 return AE_BAD_PARAMETER;
 300
 301         *phys = virt_to_phys(virt);
 302
 303         return AE_OK;
 304 }
 305 #endif
 306
 307 #define ACPI_MAX_OVERRIDE_LEN 100
 308
 309 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 310
 311 acpi_status
 312 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 313                             acpi_string * new_val)
 314 {
 315         if (!init_val || !new_val)
 316                 return AE_BAD_PARAMETER;
 317
 318         *new_val = NULL;
 319         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 320                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 321                        acpi_os_name);
 322                 *new_val = acpi_os_name;
 323         }
 324
 325         return AE_OK;
 326 }
 327
 328 acpi_status
 329 acpi_os_table_override(struct acpi_table_header * existing_table,
 330                        struct acpi_table_header ** new_table)
 331 {
 332         if (!existing_table || !new_table)
 333                 return AE_BAD_PARAMETER;
 334
 335         *new_table = NULL;
 336
 337 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 338         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 339                 *new_table = (struct acpi_table_header *)AmlCode;
 340 #endif
 341         if (*new_table != NULL) {
 342                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 343                            "this is unsafe: tainting kernel\n",
 344                        existing_table->signature,
 345                        existing_table->oem_table_id);
 346                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 347         }
 348         return AE_OK;
 349 }
 350
 351 static irqreturn_t acpi_irq(int irq, void *dev_id)
 352 {
 353         u32 handled;
 354
 355         handled = (*acpi_irq_handler) (acpi_irq_context);
 356
 357         if (handled) {
 358                 acpi_irq_handled++;
 359                 return IRQ_HANDLED;
 360         } else
 361                 return IRQ_NONE;
 362 }
 363
 364 acpi_status
 365 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 366                                   void *context)
 367 {
 368         unsigned int irq;
 369
 370         acpi_irq_stats_init();
 371
 372         /*
 373          * Ignore the GSI from the core, and use the value in our copy of the
 374          * FADT. It may not be the same if an interrupt source override exists
 375          * for the SCI.
 376          */
 377         gsi = acpi_gbl_FADT.sci_interrupt;
 378         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 379                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 380                        gsi);
 381                 return AE_OK;
 382         }
 383
 384         acpi_irq_handler = handler;
 385         acpi_irq_context = context;
 386         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 387                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 388                 return AE_NOT_ACQUIRED;
 389         }
 390         acpi_irq_irq = irq;
 391
 392         return AE_OK;
 393 }
 394
 395 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 396 {
 397         if (irq) {
 398                 free_irq(irq, acpi_irq);
 399                 acpi_irq_handler = NULL;
 400                 acpi_irq_irq = 0;
 401         }
 402
 403         return AE_OK;
 404 }
 405
 406 /*
 407  * Running in interpreter thread context, safe to sleep
 408  */
 409
 410 void acpi_os_sleep(acpi_integer ms)
 411 {
 412         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 413 }
 414
 415 void acpi_os_stall(u32 us)
 416 {
 417         while (us) {
 418                 u32 delay = 1000;
 419
 420                 if (delay > us)
 421                         delay = us;
 422                 udelay(delay);
 423                 touch_nmi_watchdog();
 424                 us -= delay;
 425         }
 426 }
 427
 428 /*
 429  * Support ACPI 3.0 AML Timer operand
 430  * Returns 64-bit free-running, monotonically increasing timer
 431  * with 100ns granularity
 432  */
 433 u64 acpi_os_get_timer(void)
 434 {
 435         static u64 t;
 436
 437 #ifdef  CONFIG_HPET
 438         /* TBD: use HPET if available */
 439 #endif
 440
 441 #ifdef  CONFIG_X86_PM_TIMER
 442         /* TBD: default to PM timer if HPET was not available */
 443 #endif
 444         if (!t)
 445                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 446
 447         return ++t;
 448 }
 449
 450 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 451 {
 452         u32 dummy;
 453
 454         if (!value)
 455                 value = &dummy;
 456
 457         *value = 0;
 458         if (width <= 8) {
 459                 *(u8 *) value = inb(port);
 460         } else if (width <= 16) {
 461                 *(u16 *) value = inw(port);
 462         } else if (width <= 32) {
 463                 *(u32 *) value = inl(port);
 464         } else {
 465                 BUG();
 466         }
 467
 468         return AE_OK;
 469 }
 470
 471 EXPORT_SYMBOL(acpi_os_read_port);
 472
 473 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 474 {
 475         if (width <= 8) {
 476                 outb(value, port);
 477         } else if (width <= 16) {
 478                 outw(value, port);
 479         } else if (width <= 32) {
 480                 outl(value, port);
 481         } else {
 482                 BUG();
 483         }
 484
 485         return AE_OK;
 486 }
 487
 488 EXPORT_SYMBOL(acpi_os_write_port);
 489
 490 acpi_status
 491 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 492 {
 493         u32 dummy;
 494         void __iomem *virt_addr;
 495
 496         virt_addr = ioremap(phys_addr, width);
 497         if (!value)
 498                 value = &dummy;
 499
 500         switch (width) {
 501         case 8:
 502                 *(u8 *) value = readb(virt_addr);
 503                 break;
 504         case 16:
 505                 *(u16 *) value = readw(virt_addr);
 506                 break;
 507         case 32:
 508                 *(u32 *) value = readl(virt_addr);
 509                 break;
 510         default:
 511                 BUG();
 512         }
 513
 514         iounmap(virt_addr);
 515
 516         return AE_OK;
 517 }
 518
 519 acpi_status
 520 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 521 {
 522         void __iomem *virt_addr;
 523
 524         virt_addr = ioremap(phys_addr, width);
 525
 526         switch (width) {
 527         case 8:
 528                 writeb(value, virt_addr);
 529                 break;
 530         case 16:
 531                 writew(value, virt_addr);
 532                 break;
 533         case 32:
 534                 writel(value, virt_addr);
 535                 break;
 536         default:
 537                 BUG();
 538         }
 539
 540         iounmap(virt_addr);
 541
 542         return AE_OK;
 543 }
 544
 545 acpi_status
 546 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 547                                u32 *value, u32 width)
 548 {
 549         int result, size;
 550
 551         if (!value)
 552                 return AE_BAD_PARAMETER;
 553
 554         switch (width) {
 555         case 8:
 556                 size = 1;
 557                 break;
 558         case 16:
 559                 size = 2;
 560                 break;
 561         case 32:
 562                 size = 4;
 563                 break;
 564         default:
 565                 return AE_ERROR;
 566         }
 567
 568         result = raw_pci_read(pci_id->segment, pci_id->bus,
 569                                 PCI_DEVFN(pci_id->device, pci_id->function),
 570                                 reg, size, value);
 571
 572         return (result ? AE_ERROR : AE_OK);
 573 }
 574
 575 acpi_status
 576 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 577                                 acpi_integer value, u32 width)
 578 {
 579         int result, size;
 580
 581         switch (width) {
 582         case 8:
 583                 size = 1;
 584                 break;
 585         case 16:
 586                 size = 2;
 587                 break;
 588         case 32:
 589                 size = 4;
 590                 break;
 591         default:
 592                 return AE_ERROR;
 593         }
 594
 595         result = raw_pci_write(pci_id->segment, pci_id->bus,
 596                                 PCI_DEVFN(pci_id->device, pci_id->function),
 597                                 reg, size, value);
 598
 599         return (result ? AE_ERROR : AE_OK);
 600 }
 601
 602 /* TODO: Change code to take advantage of driver model more */
 603 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 604                                     acpi_handle chandle,        /* current node */
 605                                     struct acpi_pci_id **id,
 606                                     int *is_bridge, u8 * bus_number)
 607 {
 608         acpi_handle handle;
 609         struct acpi_pci_id *pci_id = *id;
 610         acpi_status status;
 611         unsigned long temp;
 612         acpi_object_type type;
 613
 614         acpi_get_parent(chandle, &handle);
 615         if (handle != rhandle) {
 616                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 617                                         bus_number);
 618
 619                 status = acpi_get_type(handle, &type);
 620                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 621                         return;
 622
 623                 status =
 624                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 625                                           &temp);
 626                 if (ACPI_SUCCESS(status)) {
 627                         u32 val;
 628                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 629                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 630
 631                         if (*is_bridge)
 632                                 pci_id->bus = *bus_number;
 633
 634                         /* any nicer way to get bus number of bridge ? */
 635                         status =
 636                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 637                                                            8);
 638                         if (ACPI_SUCCESS(status)
 639                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 640                                 status =
 641                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 642                                                                    &val, 8);
 643                                 if (!ACPI_SUCCESS(status)) {
 644                                         /* Certainly broken...  FIX ME */
 645                                         return;
 646                                 }
 647                                 *is_bridge = 1;
 648                                 pci_id->bus = val;
 649                                 status =
 650                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 651                                                                    &val, 8);
 652                                 if (ACPI_SUCCESS(status)) {
 653                                         *bus_number = val;
 654                                 }
 655                         } else
 656                                 *is_bridge = 0;
 657                 }
 658         }
 659 }
 660
 661 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 662                            acpi_handle chandle, /* current node */
 663                            struct acpi_pci_id **id)
 664 {
 665         int is_bridge = 1;
 666         u8 bus_number = (*id)->bus;
 667
 668         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 669 }
 670
 671 static void acpi_os_execute_deferred(struct work_struct *work)
 672 {
 673         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 674         if (!dpc) {
 675                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 676                 return;
 677         }
 678
 679         dpc->function(dpc->context);
 680         kfree(dpc);
 681
 682         return;
 683 }
 684
 685 static void acpi_os_execute_hp_deferred(struct work_struct *work)
 686 {
 687         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 688         if (!dpc) {
 689                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 690                 return;
 691         }
 692
 693         acpi_os_wait_events_complete(NULL);
 694
 695         dpc->function(dpc->context);
 696         kfree(dpc);
 697
 698         return;
 699 }
 700
 701 /*******************************************************************************
 702  *
 703  * FUNCTION:    acpi_os_execute
 704  *
 705  * PARAMETERS:  Type               - Type of the callback
 706  *              Function           - Function to be executed
 707  *              Context            - Function parameters
 708  *
 709  * RETURN:      Status
 710  *
 711  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 712  *              immediately executes function on a separate thread.
 713  *
 714  ******************************************************************************/
 715
 716 static acpi_status __acpi_os_execute(acpi_execute_type type,
 717         acpi_osd_exec_callback function, void *context, int hp)
 718 {
 719         acpi_status status = AE_OK;
 720         struct acpi_os_dpc *dpc;
 721         struct workqueue_struct *queue;
 722         int ret;
 723         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 724                           "Scheduling function [%p(%p)] for deferred execution.\n",
 725                           function, context));
 726
 727         if (!function)
 728                 return AE_BAD_PARAMETER;
 729
 730         /*
 731          * Allocate/initialize DPC structure.  Note that this memory will be
 732          * freed by the callee.  The kernel handles the work_struct list  in a
 733          * way that allows us to also free its memory inside the callee.
 734          * Because we may want to schedule several tasks with different
 735          * parameters we can't use the approach some kernel code uses of
 736          * having a static work_struct.
 737          */
 738
 739         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 740         if (!dpc)
 741                 return_ACPI_STATUS(AE_NO_MEMORY);
 742
 743         dpc->function = function;
 744         dpc->context = context;
 745
 746         if (!hp) {
 747                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 748                 queue = (type == OSL_NOTIFY_HANDLER) ?
 749                         kacpi_notify_wq : kacpid_wq;
 750                 ret = queue_work(queue, &dpc->work);
 751         } else {
 752                 INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred);
 753                 ret = schedule_work(&dpc->work);
 754         }
 755
 756         if (!ret) {
 757                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 758                           "Call to queue_work() failed.\n"));
 759                 status = AE_ERROR;
 760                 kfree(dpc);
 761         }
 762         return_ACPI_STATUS(status);
 763 }
 764
 765 acpi_status acpi_os_execute(acpi_execute_type type,
 766                             acpi_osd_exec_callback function, void *context)
 767 {
 768         return __acpi_os_execute(type, function, context, 0);
 769 }
 770 EXPORT_SYMBOL(acpi_os_execute);
 771
 772 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 773         void *context)
 774 {
 775         return __acpi_os_execute(0, function, context, 1);
 776 }
 777
 778 void acpi_os_wait_events_complete(void *context)
 779 {
 780         flush_workqueue(kacpid_wq);
 781         flush_workqueue(kacpi_notify_wq);
 782 }
 783
 784 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 785
 786 /*
 787  * Allocate the memory for a spinlock and initialize it.
 788  */
 789 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 790 {
 791         spin_lock_init(*handle);
 792
 793         return AE_OK;
 794 }
 795
 796 /*
 797  * Deallocate the memory for a spinlock.
 798  */
 799 void acpi_os_delete_lock(acpi_spinlock handle)
 800 {
 801         return;
 802 }
 803
 804 acpi_status
 805 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 806 {
 807         struct semaphore *sem = NULL;
 808
 809         sem = acpi_os_allocate(sizeof(struct semaphore));
 810         if (!sem)
 811                 return AE_NO_MEMORY;
 812         memset(sem, 0, sizeof(struct semaphore));
 813
 814         sema_init(sem, initial_units);
 815
 816         *handle = (acpi_handle *) sem;
 817
 818         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 819                           *handle, initial_units));
 820
 821         return AE_OK;
 822 }
 823
 824 /*
 825  * TODO: A better way to delete semaphores?  Linux doesn't have a
 826  * 'delete_semaphore()' function -- may result in an invalid
 827  * pointer dereference for non-synchronized consumers.  Should
 828  * we at least check for blocked threads and signal/cancel them?
 829  */
 830
 831 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 832 {
 833         struct semaphore *sem = (struct semaphore *)handle;
 834
 835         if (!sem)
 836                 return AE_BAD_PARAMETER;
 837
 838         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 839
 840         BUG_ON(!list_empty(&sem->wait_list));
 841         kfree(sem);
 842         sem = NULL;
 843
 844         return AE_OK;
 845 }
 846
 847 /*
 848  * TODO: Support for units > 1?
 849  */
 850 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 851 {
 852         acpi_status status = AE_OK;
 853         struct semaphore *sem = (struct semaphore *)handle;
 854         long jiffies;
 855         int ret = 0;
 856
 857         if (!sem || (units < 1))
 858                 return AE_BAD_PARAMETER;
 859
 860         if (units > 1)
 861                 return AE_SUPPORT;
 862
 863         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 864                           handle, units, timeout));
 865
 866         if (timeout == ACPI_WAIT_FOREVER)
 867                 jiffies = MAX_SCHEDULE_TIMEOUT;
 868         else
 869                 jiffies = msecs_to_jiffies(timeout);
 870
 871         ret = down_timeout(sem, jiffies);
 872         if (ret)
 873                 status = AE_TIME;
 874
 875         if (ACPI_FAILURE(status)) {
 876                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 877                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 878                                   handle, units, timeout,
 879                                   acpi_format_exception(status)));
 880         } else {
 881                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 882                                   "Acquired semaphore[%p|%d|%d]", handle,
 883                                   units, timeout));
 884         }
 885
 886         return status;
 887 }
 888
 889 /*
 890  * TODO: Support for units > 1?
 891  */
 892 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 893 {
 894         struct semaphore *sem = (struct semaphore *)handle;
 895
 896         if (!sem || (units < 1))
 897                 return AE_BAD_PARAMETER;
 898
 899         if (units > 1)
 900                 return AE_SUPPORT;
 901
 902         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 903                           units));
 904
 905         up(sem);
 906
 907         return AE_OK;
 908 }
 909
 910 #ifdef ACPI_FUTURE_USAGE
 911 u32 acpi_os_get_line(char *buffer)
 912 {
 913
 914 #ifdef ENABLE_DEBUGGER
 915         if (acpi_in_debugger) {
 916                 u32 chars;
 917
 918                 kdb_read(buffer, sizeof(line_buf));
 919
 920                 /* remove the CR kdb includes */
 921                 chars = strlen(buffer) - 1;
 922                 buffer[chars] = '\0';
 923         }
 924 #endif
 925
 926         return 0;
 927 }
 928 #endif                          /*  ACPI_FUTURE_USAGE  */
 929
 930 acpi_status acpi_os_signal(u32 function, void *info)
 931 {
 932         switch (function) {
 933         case ACPI_SIGNAL_FATAL:
 934                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 935                 break;
 936         case ACPI_SIGNAL_BREAKPOINT:
 937                 /*
 938                  * AML Breakpoint
 939                  * ACPI spec. says to treat it as a NOP unless
 940                  * you are debugging.  So if/when we integrate
 941                  * AML debugger into the kernel debugger its
 942                  * hook will go here.  But until then it is
 943                  * not useful to print anything on breakpoints.
 944                  */
 945                 break;
 946         default:
 947                 break;
 948         }
 949
 950         return AE_OK;
 951 }
 952
 953 static int __init acpi_os_name_setup(char *str)
 954 {
 955         char *p = acpi_os_name;
 956         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 957
 958         if (!str || !*str)
 959                 return 0;
 960
 961         for (; count-- && str && *str; str++) {
 962                 if (isalnum(*str) || *str == ' ' || *str == ':')
 963                         *p++ = *str;
 964                 else if (*str == '\'' || *str == '"')
 965                         continue;
 966                 else
 967                         break;
 968         }
 969         *p = 0;
 970
 971         return 1;
 972
 973 }
 974
 975 __setup("acpi_os_name=", acpi_os_name_setup);
 976
 977 static void __init set_osi_linux(unsigned int enable)
 978 {
 979         if (osi_linux.enable != enable) {
 980                 osi_linux.enable = enable;
 981                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
 982                         enable ? "Add": "Delet");
 983         }
 984         return;
 985 }
 986
 987 static void __init acpi_cmdline_osi_linux(unsigned int enable)
 988 {
 989         osi_linux.cmdline = 1;  /* cmdline set the default */
 990         set_osi_linux(enable);
 991
 992         return;
 993 }
 994
 995 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
 996 {
 997         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
 998
 999         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1000
1001         if (enable == -1)
1002                 return;
1003
1004         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1005
1006         set_osi_linux(enable);
1007
1008         return;
1009 }
1010
1011 /*
1012  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1013  *
1014  * empty string disables _OSI
1015  * string starting with '!' disables that string
1016  * otherwise string is added to list, augmenting built-in strings
1017  */
1018 int __init acpi_osi_setup(char *str)
1019 {
1020         if (str == NULL || *str == '\0') {
1021                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1022                 acpi_gbl_create_osi_method = FALSE;
1023         } else if (!strcmp("!Linux", str)) {
1024                 acpi_cmdline_osi_linux(0);      /* !enable */
1025         } else if (*str == '!') {
1026                 if (acpi_osi_invalidate(++str) == AE_OK)
1027                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1028         } else if (!strcmp("Linux", str)) {
1029                 acpi_cmdline_osi_linux(1);      /* enable */
1030         } else if (*osi_additional_string == '\0') {
1031                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1032                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1033         }
1034
1035         return 1;
1036 }
1037
1038 __setup("acpi_osi=", acpi_osi_setup);
1039
1040 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1041 static int __init acpi_serialize_setup(char *str)
1042 {
1043         printk(KERN_INFO PREFIX "serialize enabled\n");
1044
1045         acpi_gbl_all_methods_serialized = TRUE;
1046
1047         return 1;
1048 }
1049
1050 __setup("acpi_serialize", acpi_serialize_setup);
1051
1052 /*
1053  * Wake and Run-Time GPES are expected to be separate.
1054  * We disable wake-GPEs at run-time to prevent spurious
1055  * interrupts.
1056  *
1057  * However, if a system exists that shares Wake and
1058  * Run-time events on the same GPE this flag is available
1059  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1060  */
1061 static int __init acpi_wake_gpes_always_on_setup(char *str)
1062 {
1063         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1064
1065         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1066
1067         return 1;
1068 }
1069
1070 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1071
1072 /* Check of resource interference between native drivers and ACPI
1073  * OperationRegions (SystemIO and System Memory only).
1074  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1075  * in arbitrary AML code and can interfere with legacy drivers.
1076  * acpi_enforce_resources= can be set to:
1077  *
1078  *   - strict           (2)
1079  *     -> further driver trying to access the resources will not load
1080  *   - lax (default)    (1)
1081  *     -> further driver trying to access the resources will load, but you
1082  *     get a system message that something might go wrong...
1083  *
1084  *   - no               (0)
1085  *     -> ACPI Operation Region resources will not be registered
1086  *
1087  */
1088 #define ENFORCE_RESOURCES_STRICT 2
1089 #define ENFORCE_RESOURCES_LAX    1
1090 #define ENFORCE_RESOURCES_NO     0
1091
1092 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1093
1094 static int __init acpi_enforce_resources_setup(char *str)
1095 {
1096         if (str == NULL || *str == '\0')
1097                 return 0;
1098
1099         if (!strcmp("strict", str))
1100                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1101         else if (!strcmp("lax", str))
1102                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1103         else if (!strcmp("no", str))
1104                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1105
1106         return 1;
1107 }
1108
1109 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1110
1111 /* Check for resource conflicts between ACPI OperationRegions and native
1112  * drivers */
1113 int acpi_check_resource_conflict(struct resource *res)
1114 {
1115         struct acpi_res_list *res_list_elem;
1116         int ioport;
1117         int clash = 0;
1118
1119         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1120                 return 0;
1121         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1122                 return 0;
1123
1124         ioport = res->flags & IORESOURCE_IO;
1125
1126         spin_lock(&acpi_res_lock);
1127         list_for_each_entry(res_list_elem, &resource_list_head,
1128                             resource_list) {
1129                 if (ioport && (res_list_elem->resource_type
1130                                != ACPI_ADR_SPACE_SYSTEM_IO))
1131                         continue;
1132                 if (!ioport && (res_list_elem->resource_type
1133                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1134                         continue;
1135
1136                 if (res->end < res_list_elem->start
1137                     || res_list_elem->end < res->start)
1138                         continue;
1139                 clash = 1;
1140                 break;
1141         }
1142         spin_unlock(&acpi_res_lock);
1143
1144         if (clash) {
1145                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1146                         printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1147                                " conflicts with ACPI region %s"
1148                                " [0x%llx-0x%llx]\n",
1149                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1150                                ? KERN_WARNING : KERN_ERR,
1151                                ioport ? "I/O" : "Memory", res->name,
1152                                (long long) res->start, (long long) res->end,
1153                                res_list_elem->name,
1154                                (long long) res_list_elem->start,
1155                                (long long) res_list_elem->end);
1156                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1157                 }
1158                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1159                         return -EBUSY;
1160         }
1161         return 0;
1162 }
1163 EXPORT_SYMBOL(acpi_check_resource_conflict);
1164
1165 int acpi_check_region(resource_size_t start, resource_size_t n,
1166                       const char *name)
1167 {
1168         struct resource res = {
1169                 .start = start,
1170                 .end   = start + n - 1,
1171                 .name  = name,
1172                 .flags = IORESOURCE_IO,
1173         };
1174
1175         return acpi_check_resource_conflict(&res);
1176 }
1177 EXPORT_SYMBOL(acpi_check_region);
1178
1179 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1180                       const char *name)
1181 {
1182         struct resource res = {
1183                 .start = start,
1184                 .end   = start + n - 1,
1185                 .name  = name,
1186                 .flags = IORESOURCE_MEM,
1187         };
1188
1189         return acpi_check_resource_conflict(&res);
1190
1191 }
1192 EXPORT_SYMBOL(acpi_check_mem_region);
1193
1194 /*
1195  * Acquire a spinlock.
1196  *
1197  * handle is a pointer to the spinlock_t.
1198  */
1199
1200 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1201 {
1202         acpi_cpu_flags flags;
1203         spin_lock_irqsave(lockp, flags);
1204         return flags;
1205 }
1206
1207 /*
1208  * Release a spinlock. See above.
1209  */
1210
1211 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1212 {
1213         spin_unlock_irqrestore(lockp, flags);
1214 }
1215
1216 #ifndef ACPI_USE_LOCAL_CACHE
1217
1218 /*******************************************************************************
1219  *
1220  * FUNCTION:    acpi_os_create_cache
1221  *
1222  * PARAMETERS:  name      - Ascii name for the cache
1223  *              size      - Size of each cached object
1224  *              depth     - Maximum depth of the cache (in objects) <ignored>
1225  *              cache     - Where the new cache object is returned
1226  *
1227  * RETURN:      status
1228  *
1229  * DESCRIPTION: Create a cache object
1230  *
1231  ******************************************************************************/
1232
1233 acpi_status
1234 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1235 {
1236         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1237         if (*cache == NULL)
1238                 return AE_ERROR;
1239         else
1240                 return AE_OK;
1241 }
1242
1243 /*******************************************************************************
1244  *
1245  * FUNCTION:    acpi_os_purge_cache
1246  *
1247  * PARAMETERS:  Cache           - Handle to cache object
1248  *
1249  * RETURN:      Status
1250  *
1251  * DESCRIPTION: Free all objects within the requested cache.
1252  *
1253  ******************************************************************************/
1254
1255 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1256 {
1257         kmem_cache_shrink(cache);
1258         return (AE_OK);
1259 }
1260
1261 /*******************************************************************************
1262  *
1263  * FUNCTION:    acpi_os_delete_cache
1264  *
1265  * PARAMETERS:  Cache           - Handle to cache object
1266  *
1267  * RETURN:      Status
1268  *
1269  * DESCRIPTION: Free all objects within the requested cache and delete the
1270  *              cache object.
1271  *
1272  ******************************************************************************/
1273
1274 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1275 {
1276         kmem_cache_destroy(cache);
1277         return (AE_OK);
1278 }
1279
1280 /*******************************************************************************
1281  *
1282  * FUNCTION:    acpi_os_release_object
1283  *
1284  * PARAMETERS:  Cache       - Handle to cache object
1285  *              Object      - The object to be released
1286  *
1287  * RETURN:      None
1288  *
1289  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1290  *              the object is deleted.
1291  *
1292  ******************************************************************************/
1293
1294 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1295 {
1296         kmem_cache_free(cache, object);
1297         return (AE_OK);
1298 }
1299
1300 /**
1301  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1302  *
1303  *      Returns 0 on success
1304  */
1305 static int acpi_dmi_dump(void)
1306 {
1307
1308         if (!dmi_available)
1309                 return -1;
1310
1311         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1312                 dmi_get_system_info(DMI_SYS_VENDOR));
1313         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1314                 dmi_get_system_info(DMI_PRODUCT_NAME));
1315         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1316                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1317         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1318                 dmi_get_system_info(DMI_BOARD_NAME));
1319         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1320                 dmi_get_system_info(DMI_BIOS_VENDOR));
1321         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1322                 dmi_get_system_info(DMI_BIOS_DATE));
1323
1324         return 0;
1325 }
1326
1327
1328 /******************************************************************************
1329  *
1330  * FUNCTION:    acpi_os_validate_interface
1331  *
1332  * PARAMETERS:  interface           - Requested interface to be validated
1333  *
1334  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1335  *
1336  * DESCRIPTION: Match an interface string to the interfaces supported by the
1337  *              host. Strings originate from an AML call to the _OSI method.
1338  *
1339  *****************************************************************************/
1340
1341 acpi_status
1342 acpi_os_validate_interface (char *interface)
1343 {
1344         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1345                 return AE_OK;
1346         if (!strcmp("Linux", interface)) {
1347
1348                 printk(KERN_NOTICE PREFIX
1349                         "BIOS _OSI(Linux) query %s%s\n",
1350                         osi_linux.enable ? "honored" : "ignored",
1351                         osi_linux.cmdline ? " via cmdline" :
1352                         osi_linux.dmi ? " via DMI" : "");
1353
1354                 if (!osi_linux.dmi) {
1355                         if (acpi_dmi_dump())
1356                                 printk(KERN_NOTICE PREFIX
1357                                         "[please extract dmidecode output]\n");
1358                         printk(KERN_NOTICE PREFIX
1359                                 "Please send DMI info above to "
1360                                 "linux-acpi@vger.kernel.org\n");
1361                 }
1362                 if (!osi_linux.known && !osi_linux.cmdline) {
1363                         printk(KERN_NOTICE PREFIX
1364                                 "If \"acpi_osi=%sLinux\" works better, "
1365                                 "please notify linux-acpi@vger.kernel.org\n",
1366                                 osi_linux.enable ? "!" : "");
1367                 }
1368
1369                 if (osi_linux.enable)
1370                         return AE_OK;
1371         }
1372         return AE_SUPPORT;
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         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1400                 return AE_OK;
1401
1402         switch (space_id) {
1403         case ACPI_ADR_SPACE_SYSTEM_IO:
1404         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1405                 /* Only interference checks against SystemIO and SytemMemory
1406                    are needed */
1407                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1408                 if (!res)
1409                         return AE_OK;
1410                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1411                 strlcpy(res->name, name, 5);
1412                 res->start = address;
1413                 res->end = address + length - 1;
1414                 res->resource_type = space_id;
1415                 spin_lock(&acpi_res_lock);
1416                 list_add(&res->resource_list, &resource_list_head);
1417                 spin_unlock(&acpi_res_lock);
1418                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1419                          "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1420                          ? "SystemIO" : "System Memory",
1421                          (unsigned long long)res->start,
1422                          (unsigned long long)res->end,
1423                          res->name);
1424                 break;
1425         case ACPI_ADR_SPACE_PCI_CONFIG:
1426         case ACPI_ADR_SPACE_EC:
1427         case ACPI_ADR_SPACE_SMBUS:
1428         case ACPI_ADR_SPACE_CMOS:
1429         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1430         case ACPI_ADR_SPACE_DATA_TABLE:
1431         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1432                 break;
1433         }
1434         return AE_OK;
1435 }
1436
1437 #endif