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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 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 = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 624                                           &temp);
 625                 if (ACPI_SUCCESS(status)) {
 626                         u32 val;
 627                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 628                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 629
 630                         if (*is_bridge)
 631                                 pci_id->bus = *bus_number;
 632
 633                         /* any nicer way to get bus number of bridge ? */
 634                         status =
 635                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 636                                                            8);
 637                         if (ACPI_SUCCESS(status)
 638                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 639                                 status =
 640                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 641                                                                    &val, 8);
 642                                 if (!ACPI_SUCCESS(status)) {
 643                                         /* Certainly broken...  FIX ME */
 644                                         return;
 645                                 }
 646                                 *is_bridge = 1;
 647                                 pci_id->bus = val;
 648                                 status =
 649                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 650                                                                    &val, 8);
 651                                 if (ACPI_SUCCESS(status)) {
 652                                         *bus_number = val;
 653                                 }
 654                         } else
 655                                 *is_bridge = 0;
 656                 }
 657         }
 658 }
 659
 660 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 661                            acpi_handle chandle, /* current node */
 662                            struct acpi_pci_id **id)
 663 {
 664         int is_bridge = 1;
 665         u8 bus_number = (*id)->bus;
 666
 667         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 668 }
 669
 670 static void acpi_os_execute_deferred(struct work_struct *work)
 671 {
 672         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 673         if (!dpc) {
 674                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 675                 return;
 676         }
 677
 678         dpc->function(dpc->context);
 679         kfree(dpc);
 680
 681         return;
 682 }
 683
 684 static void acpi_os_execute_hp_deferred(struct work_struct *work)
 685 {
 686         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 687         if (!dpc) {
 688                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 689                 return;
 690         }
 691
 692         acpi_os_wait_events_complete(NULL);
 693
 694         dpc->function(dpc->context);
 695         kfree(dpc);
 696
 697         return;
 698 }
 699
 700 /*******************************************************************************
 701  *
 702  * FUNCTION:    acpi_os_execute
 703  *
 704  * PARAMETERS:  Type               - Type of the callback
 705  *              Function           - Function to be executed
 706  *              Context            - Function parameters
 707  *
 708  * RETURN:      Status
 709  *
 710  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 711  *              immediately executes function on a separate thread.
 712  *
 713  ******************************************************************************/
 714
 715 static acpi_status __acpi_os_execute(acpi_execute_type type,
 716         acpi_osd_exec_callback function, void *context, int hp)
 717 {
 718         acpi_status status = AE_OK;
 719         struct acpi_os_dpc *dpc;
 720         struct workqueue_struct *queue;
 721         int ret;
 722         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 723                           "Scheduling function [%p(%p)] for deferred execution.\n",
 724                           function, context));
 725
 726         if (!function)
 727                 return AE_BAD_PARAMETER;
 728
 729         /*
 730          * Allocate/initialize DPC structure.  Note that this memory will be
 731          * freed by the callee.  The kernel handles the work_struct list  in a
 732          * way that allows us to also free its memory inside the callee.
 733          * Because we may want to schedule several tasks with different
 734          * parameters we can't use the approach some kernel code uses of
 735          * having a static work_struct.
 736          */
 737
 738         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 739         if (!dpc)
 740                 return_ACPI_STATUS(AE_NO_MEMORY);
 741
 742         dpc->function = function;
 743         dpc->context = context;
 744
 745         if (!hp) {
 746                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 747                 queue = (type == OSL_NOTIFY_HANDLER) ?
 748                         kacpi_notify_wq : kacpid_wq;
 749                 ret = queue_work(queue, &dpc->work);
 750         } else {
 751                 INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred);
 752                 ret = schedule_work(&dpc->work);
 753         }
 754
 755         if (!ret) {
 756                 printk(KERN_ERR PREFIX
 757                           "Call to queue_work() failed.\n");
 758                 status = AE_ERROR;
 759                 kfree(dpc);
 760         }
 761         return_ACPI_STATUS(status);
 762 }
 763
 764 acpi_status acpi_os_execute(acpi_execute_type type,
 765                             acpi_osd_exec_callback function, void *context)
 766 {
 767         return __acpi_os_execute(type, function, context, 0);
 768 }
 769 EXPORT_SYMBOL(acpi_os_execute);
 770
 771 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 772         void *context)
 773 {
 774         return __acpi_os_execute(0, function, context, 1);
 775 }
 776
 777 void acpi_os_wait_events_complete(void *context)
 778 {
 779         flush_workqueue(kacpid_wq);
 780         flush_workqueue(kacpi_notify_wq);
 781 }
 782
 783 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 784
 785 /*
 786  * Allocate the memory for a spinlock and initialize it.
 787  */
 788 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 789 {
 790         spin_lock_init(*handle);
 791
 792         return AE_OK;
 793 }
 794
 795 /*
 796  * Deallocate the memory for a spinlock.
 797  */
 798 void acpi_os_delete_lock(acpi_spinlock handle)
 799 {
 800         return;
 801 }
 802
 803 acpi_status
 804 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 805 {
 806         struct semaphore *sem = NULL;
 807
 808         sem = acpi_os_allocate(sizeof(struct semaphore));
 809         if (!sem)
 810                 return AE_NO_MEMORY;
 811         memset(sem, 0, sizeof(struct semaphore));
 812
 813         sema_init(sem, initial_units);
 814
 815         *handle = (acpi_handle *) sem;
 816
 817         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 818                           *handle, initial_units));
 819
 820         return AE_OK;
 821 }
 822
 823 /*
 824  * TODO: A better way to delete semaphores?  Linux doesn't have a
 825  * 'delete_semaphore()' function -- may result in an invalid
 826  * pointer dereference for non-synchronized consumers.  Should
 827  * we at least check for blocked threads and signal/cancel them?
 828  */
 829
 830 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 831 {
 832         struct semaphore *sem = (struct semaphore *)handle;
 833
 834         if (!sem)
 835                 return AE_BAD_PARAMETER;
 836
 837         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 838
 839         BUG_ON(!list_empty(&sem->wait_list));
 840         kfree(sem);
 841         sem = NULL;
 842
 843         return AE_OK;
 844 }
 845
 846 /*
 847  * TODO: Support for units > 1?
 848  */
 849 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 850 {
 851         acpi_status status = AE_OK;
 852         struct semaphore *sem = (struct semaphore *)handle;
 853         long jiffies;
 854         int ret = 0;
 855
 856         if (!sem || (units < 1))
 857                 return AE_BAD_PARAMETER;
 858
 859         if (units > 1)
 860                 return AE_SUPPORT;
 861
 862         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 863                           handle, units, timeout));
 864
 865         if (timeout == ACPI_WAIT_FOREVER)
 866                 jiffies = MAX_SCHEDULE_TIMEOUT;
 867         else
 868                 jiffies = msecs_to_jiffies(timeout);
 869
 870         ret = down_timeout(sem, jiffies);
 871         if (ret)
 872                 status = AE_TIME;
 873
 874         if (ACPI_FAILURE(status)) {
 875                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 876                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 877                                   handle, units, timeout,
 878                                   acpi_format_exception(status)));
 879         } else {
 880                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 881                                   "Acquired semaphore[%p|%d|%d]", handle,
 882                                   units, timeout));
 883         }
 884
 885         return status;
 886 }
 887
 888 /*
 889  * TODO: Support for units > 1?
 890  */
 891 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 892 {
 893         struct semaphore *sem = (struct semaphore *)handle;
 894
 895         if (!sem || (units < 1))
 896                 return AE_BAD_PARAMETER;
 897
 898         if (units > 1)
 899                 return AE_SUPPORT;
 900
 901         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 902                           units));
 903
 904         up(sem);
 905
 906         return AE_OK;
 907 }
 908
 909 #ifdef ACPI_FUTURE_USAGE
 910 u32 acpi_os_get_line(char *buffer)
 911 {
 912
 913 #ifdef ENABLE_DEBUGGER
 914         if (acpi_in_debugger) {
 915                 u32 chars;
 916
 917                 kdb_read(buffer, sizeof(line_buf));
 918
 919                 /* remove the CR kdb includes */
 920                 chars = strlen(buffer) - 1;
 921                 buffer[chars] = '\0';
 922         }
 923 #endif
 924
 925         return 0;
 926 }
 927 #endif                          /*  ACPI_FUTURE_USAGE  */
 928
 929 acpi_status acpi_os_signal(u32 function, void *info)
 930 {
 931         switch (function) {
 932         case ACPI_SIGNAL_FATAL:
 933                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 934                 break;
 935         case ACPI_SIGNAL_BREAKPOINT:
 936                 /*
 937                  * AML Breakpoint
 938                  * ACPI spec. says to treat it as a NOP unless
 939                  * you are debugging.  So if/when we integrate
 940                  * AML debugger into the kernel debugger its
 941                  * hook will go here.  But until then it is
 942                  * not useful to print anything on breakpoints.
 943                  */
 944                 break;
 945         default:
 946                 break;
 947         }
 948
 949         return AE_OK;
 950 }
 951
 952 static int __init acpi_os_name_setup(char *str)
 953 {
 954         char *p = acpi_os_name;
 955         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 956
 957         if (!str || !*str)
 958                 return 0;
 959
 960         for (; count-- && str && *str; str++) {
 961                 if (isalnum(*str) || *str == ' ' || *str == ':')
 962                         *p++ = *str;
 963                 else if (*str == '\'' || *str == '"')
 964                         continue;
 965                 else
 966                         break;
 967         }
 968         *p = 0;
 969
 970         return 1;
 971
 972 }
 973
 974 __setup("acpi_os_name=", acpi_os_name_setup);
 975
 976 static void __init set_osi_linux(unsigned int enable)
 977 {
 978         if (osi_linux.enable != enable) {
 979                 osi_linux.enable = enable;
 980                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
 981                         enable ? "Add": "Delet");
 982         }
 983         return;
 984 }
 985
 986 static void __init acpi_cmdline_osi_linux(unsigned int enable)
 987 {
 988         osi_linux.cmdline = 1;  /* cmdline set the default */
 989         set_osi_linux(enable);
 990
 991         return;
 992 }
 993
 994 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
 995 {
 996         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
 997
 998         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
 999
1000         if (enable == -1)
1001                 return;
1002
1003         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1004
1005         set_osi_linux(enable);
1006
1007         return;
1008 }
1009
1010 /*
1011  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1012  *
1013  * empty string disables _OSI
1014  * string starting with '!' disables that string
1015  * otherwise string is added to list, augmenting built-in strings
1016  */
1017 int __init acpi_osi_setup(char *str)
1018 {
1019         if (str == NULL || *str == '\0') {
1020                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1021                 acpi_gbl_create_osi_method = FALSE;
1022         } else if (!strcmp("!Linux", str)) {
1023                 acpi_cmdline_osi_linux(0);      /* !enable */
1024         } else if (*str == '!') {
1025                 if (acpi_osi_invalidate(++str) == AE_OK)
1026                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1027         } else if (!strcmp("Linux", str)) {
1028                 acpi_cmdline_osi_linux(1);      /* enable */
1029         } else if (*osi_additional_string == '\0') {
1030                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1031                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1032         }
1033
1034         return 1;
1035 }
1036
1037 __setup("acpi_osi=", acpi_osi_setup);
1038
1039 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1040 static int __init acpi_serialize_setup(char *str)
1041 {
1042         printk(KERN_INFO PREFIX "serialize enabled\n");
1043
1044         acpi_gbl_all_methods_serialized = TRUE;
1045
1046         return 1;
1047 }
1048
1049 __setup("acpi_serialize", acpi_serialize_setup);
1050
1051 /*
1052  * Wake and Run-Time GPES are expected to be separate.
1053  * We disable wake-GPEs at run-time to prevent spurious
1054  * interrupts.
1055  *
1056  * However, if a system exists that shares Wake and
1057  * Run-time events on the same GPE this flag is available
1058  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1059  */
1060 static int __init acpi_wake_gpes_always_on_setup(char *str)
1061 {
1062         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1063
1064         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1065
1066         return 1;
1067 }
1068
1069 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1070
1071 /* Check of resource interference between native drivers and ACPI
1072  * OperationRegions (SystemIO and System Memory only).
1073  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1074  * in arbitrary AML code and can interfere with legacy drivers.
1075  * acpi_enforce_resources= can be set to:
1076  *
1077  *   - strict           (2)
1078  *     -> further driver trying to access the resources will not load
1079  *   - lax (default)    (1)
1080  *     -> further driver trying to access the resources will load, but you
1081  *     get a system message that something might go wrong...
1082  *
1083  *   - no               (0)
1084  *     -> ACPI Operation Region resources will not be registered
1085  *
1086  */
1087 #define ENFORCE_RESOURCES_STRICT 2
1088 #define ENFORCE_RESOURCES_LAX    1
1089 #define ENFORCE_RESOURCES_NO     0
1090
1091 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1092
1093 static int __init acpi_enforce_resources_setup(char *str)
1094 {
1095         if (str == NULL || *str == '\0')
1096                 return 0;
1097
1098         if (!strcmp("strict", str))
1099                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1100         else if (!strcmp("lax", str))
1101                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1102         else if (!strcmp("no", str))
1103                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1104
1105         return 1;
1106 }
1107
1108 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1109
1110 /* Check for resource conflicts between ACPI OperationRegions and native
1111  * drivers */
1112 int acpi_check_resource_conflict(struct resource *res)
1113 {
1114         struct acpi_res_list *res_list_elem;
1115         int ioport;
1116         int clash = 0;
1117
1118         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1119                 return 0;
1120         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1121                 return 0;
1122
1123         ioport = res->flags & IORESOURCE_IO;
1124
1125         spin_lock(&acpi_res_lock);
1126         list_for_each_entry(res_list_elem, &resource_list_head,
1127                             resource_list) {
1128                 if (ioport && (res_list_elem->resource_type
1129                                != ACPI_ADR_SPACE_SYSTEM_IO))
1130                         continue;
1131                 if (!ioport && (res_list_elem->resource_type
1132                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1133                         continue;
1134
1135                 if (res->end < res_list_elem->start
1136                     || res_list_elem->end < res->start)
1137                         continue;
1138                 clash = 1;
1139                 break;
1140         }
1141         spin_unlock(&acpi_res_lock);
1142
1143         if (clash) {
1144                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1145                         printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1146                                " conflicts with ACPI region %s"
1147                                " [0x%llx-0x%llx]\n",
1148                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1149                                ? KERN_WARNING : KERN_ERR,
1150                                ioport ? "I/O" : "Memory", res->name,
1151                                (long long) res->start, (long long) res->end,
1152                                res_list_elem->name,
1153                                (long long) res_list_elem->start,
1154                                (long long) res_list_elem->end);
1155                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1156                 }
1157                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1158                         return -EBUSY;
1159         }
1160         return 0;
1161 }
1162 EXPORT_SYMBOL(acpi_check_resource_conflict);
1163
1164 int acpi_check_region(resource_size_t start, resource_size_t n,
1165                       const char *name)
1166 {
1167         struct resource res = {
1168                 .start = start,
1169                 .end   = start + n - 1,
1170                 .name  = name,
1171                 .flags = IORESOURCE_IO,
1172         };
1173
1174         return acpi_check_resource_conflict(&res);
1175 }
1176 EXPORT_SYMBOL(acpi_check_region);
1177
1178 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1179                       const char *name)
1180 {
1181         struct resource res = {
1182                 .start = start,
1183                 .end   = start + n - 1,
1184                 .name  = name,
1185                 .flags = IORESOURCE_MEM,
1186         };
1187
1188         return acpi_check_resource_conflict(&res);
1189
1190 }
1191 EXPORT_SYMBOL(acpi_check_mem_region);
1192
1193 /*
1194  * Acquire a spinlock.
1195  *
1196  * handle is a pointer to the spinlock_t.
1197  */
1198
1199 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1200 {
1201         acpi_cpu_flags flags;
1202         spin_lock_irqsave(lockp, flags);
1203         return flags;
1204 }
1205
1206 /*
1207  * Release a spinlock. See above.
1208  */
1209
1210 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1211 {
1212         spin_unlock_irqrestore(lockp, flags);
1213 }
1214
1215 #ifndef ACPI_USE_LOCAL_CACHE
1216
1217 /*******************************************************************************
1218  *
1219  * FUNCTION:    acpi_os_create_cache
1220  *
1221  * PARAMETERS:  name      - Ascii name for the cache
1222  *              size      - Size of each cached object
1223  *              depth     - Maximum depth of the cache (in objects) <ignored>
1224  *              cache     - Where the new cache object is returned
1225  *
1226  * RETURN:      status
1227  *
1228  * DESCRIPTION: Create a cache object
1229  *
1230  ******************************************************************************/
1231
1232 acpi_status
1233 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1234 {
1235         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1236         if (*cache == NULL)
1237                 return AE_ERROR;
1238         else
1239                 return AE_OK;
1240 }
1241
1242 /*******************************************************************************
1243  *
1244  * FUNCTION:    acpi_os_purge_cache
1245  *
1246  * PARAMETERS:  Cache           - Handle to cache object
1247  *
1248  * RETURN:      Status
1249  *
1250  * DESCRIPTION: Free all objects within the requested cache.
1251  *
1252  ******************************************************************************/
1253
1254 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1255 {
1256         kmem_cache_shrink(cache);
1257         return (AE_OK);
1258 }
1259
1260 /*******************************************************************************
1261  *
1262  * FUNCTION:    acpi_os_delete_cache
1263  *
1264  * PARAMETERS:  Cache           - Handle to cache object
1265  *
1266  * RETURN:      Status
1267  *
1268  * DESCRIPTION: Free all objects within the requested cache and delete the
1269  *              cache object.
1270  *
1271  ******************************************************************************/
1272
1273 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1274 {
1275         kmem_cache_destroy(cache);
1276         return (AE_OK);
1277 }
1278
1279 /*******************************************************************************
1280  *
1281  * FUNCTION:    acpi_os_release_object
1282  *
1283  * PARAMETERS:  Cache       - Handle to cache object
1284  *              Object      - The object to be released
1285  *
1286  * RETURN:      None
1287  *
1288  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1289  *              the object is deleted.
1290  *
1291  ******************************************************************************/
1292
1293 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1294 {
1295         kmem_cache_free(cache, object);
1296         return (AE_OK);
1297 }
1298
1299 /**
1300  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1301  *
1302  *      Returns 0 on success
1303  */
1304 static int acpi_dmi_dump(void)
1305 {
1306
1307         if (!dmi_available)
1308                 return -1;
1309
1310         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1311                 dmi_get_system_info(DMI_SYS_VENDOR));
1312         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1313                 dmi_get_system_info(DMI_PRODUCT_NAME));
1314         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1315                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1316         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1317                 dmi_get_system_info(DMI_BOARD_NAME));
1318         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1319                 dmi_get_system_info(DMI_BIOS_VENDOR));
1320         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1321                 dmi_get_system_info(DMI_BIOS_DATE));
1322
1323         return 0;
1324 }
1325
1326
1327 /******************************************************************************
1328  *
1329  * FUNCTION:    acpi_os_validate_interface
1330  *
1331  * PARAMETERS:  interface           - Requested interface to be validated
1332  *
1333  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1334  *
1335  * DESCRIPTION: Match an interface string to the interfaces supported by the
1336  *              host. Strings originate from an AML call to the _OSI method.
1337  *
1338  *****************************************************************************/
1339
1340 acpi_status
1341 acpi_os_validate_interface (char *interface)
1342 {
1343         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1344                 return AE_OK;
1345         if (!strcmp("Linux", interface)) {
1346
1347                 printk(KERN_NOTICE PREFIX
1348                         "BIOS _OSI(Linux) query %s%s\n",
1349                         osi_linux.enable ? "honored" : "ignored",
1350                         osi_linux.cmdline ? " via cmdline" :
1351                         osi_linux.dmi ? " via DMI" : "");
1352
1353                 if (!osi_linux.dmi) {
1354                         if (acpi_dmi_dump())
1355                                 printk(KERN_NOTICE PREFIX
1356                                         "[please extract dmidecode output]\n");
1357                         printk(KERN_NOTICE PREFIX
1358                                 "Please send DMI info above to "
1359                                 "linux-acpi@vger.kernel.org\n");
1360                 }
1361                 if (!osi_linux.known && !osi_linux.cmdline) {
1362                         printk(KERN_NOTICE PREFIX
1363                                 "If \"acpi_osi=%sLinux\" works better, "
1364                                 "please notify linux-acpi@vger.kernel.org\n",
1365                                 osi_linux.enable ? "!" : "");
1366                 }
1367
1368                 if (osi_linux.enable)
1369                         return AE_OK;
1370         }
1371         return AE_SUPPORT;
1372 }
1373
1374 /******************************************************************************
1375  *
1376  * FUNCTION:    acpi_os_validate_address
1377  *
1378  * PARAMETERS:  space_id             - ACPI space ID
1379  *              address             - Physical address
1380  *              length              - Address length
1381  *
1382  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1383  *              should return AE_AML_ILLEGAL_ADDRESS.
1384  *
1385  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1386  *              the addresses accessed by AML operation regions.
1387  *
1388  *****************************************************************************/
1389
1390 acpi_status
1391 acpi_os_validate_address (
1392     u8                   space_id,
1393     acpi_physical_address   address,
1394     acpi_size               length,
1395     char *name)
1396 {
1397         struct acpi_res_list *res;
1398         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1399                 return AE_OK;
1400
1401         switch (space_id) {
1402         case ACPI_ADR_SPACE_SYSTEM_IO:
1403         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1404                 /* Only interference checks against SystemIO and SytemMemory
1405                    are needed */
1406                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1407                 if (!res)
1408                         return AE_OK;
1409                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1410                 strlcpy(res->name, name, 5);
1411                 res->start = address;
1412                 res->end = address + length - 1;
1413                 res->resource_type = space_id;
1414                 spin_lock(&acpi_res_lock);
1415                 list_add(&res->resource_list, &resource_list_head);
1416                 spin_unlock(&acpi_res_lock);
1417                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1418                          "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1419                          ? "SystemIO" : "System Memory",
1420                          (unsigned long long)res->start,
1421                          (unsigned long long)res->end,
1422                          res->name);
1423                 break;
1424         case ACPI_ADR_SPACE_PCI_CONFIG:
1425         case ACPI_ADR_SPACE_EC:
1426         case ACPI_ADR_SPACE_SMBUS:
1427         case ACPI_ADR_SPACE_CMOS:
1428         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1429         case ACPI_ADR_SPACE_DATA_TABLE:
1430         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1431                 break;
1432         }
1433         return AE_OK;
1434 }
1435
1436 #endif