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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  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/mm.h>
  32 #include <linux/pci.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/kmod.h>
  35 #include <linux/delay.h>
  36 #include <linux/dmi.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/nmi.h>
  39 #include <linux/acpi.h>
  40 #include <acpi/acpi.h>
  41 #include <asm/io.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/processor.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <linux/efi.h>
  47 #include <linux/ioport.h>
  48 #include <linux/list.h>
  49
  50 #define _COMPONENT              ACPI_OS_SERVICES
  51 ACPI_MODULE_NAME("osl");
  52 #define PREFIX          "ACPI: "
  53 struct acpi_os_dpc {
  54         acpi_osd_exec_callback function;
  55         void *context;
  56         struct work_struct work;
  57 };
  58
  59 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  60 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  61 #endif
  62
  63 #ifdef ENABLE_DEBUGGER
  64 #include <linux/kdb.h>
  65
  66 /* stuff for debugger support */
  67 int acpi_in_debugger;
  68 EXPORT_SYMBOL(acpi_in_debugger);
  69
  70 extern char line_buf[80];
  71 #endif                          /*ENABLE_DEBUGGER */
  72
  73 static unsigned int acpi_irq_irq;
  74 static acpi_osd_handler acpi_irq_handler;
  75 static void *acpi_irq_context;
  76 static struct workqueue_struct *kacpid_wq;
  77 static struct workqueue_struct *kacpi_notify_wq;
  78
  79 struct acpi_res_list {
  80         resource_size_t start;
  81         resource_size_t end;
  82         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  83         char name[5];   /* only can have a length of 4 chars, make use of this
  84                            one instead of res->name, no need to kalloc then */
  85         struct list_head resource_list;
  86 };
  87
  88 static LIST_HEAD(resource_list_head);
  89 static DEFINE_SPINLOCK(acpi_res_lock);
  90
  91 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  92 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  93
  94 /*
  95  * "Ode to _OSI(Linux)"
  96  *
  97  * osi_linux -- Control response to BIOS _OSI(Linux) query.
  98  *
  99  * As Linux evolves, the features that it supports change.
 100  * So an OSI string such as "Linux" is not specific enough
 101  * to be useful across multiple versions of Linux.  It
 102  * doesn't identify any particular feature, interface,
 103  * or even any particular version of Linux...
 104  *
 105  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
 106  * to a BIOS _OSI(Linux) query.  When
 107  * a reference mobile BIOS started using it, its use
 108  * started to spread to many vendor platforms.
 109  * As it is not supportable, we need to halt that spread.
 110  *
 111  * Today, most BIOS references to _OSI(Linux) are noise --
 112  * they have no functional effect and are just dead code
 113  * carried over from the reference BIOS.
 114  *
 115  * The next most common case is that _OSI(Linux) harms Linux,
 116  * usually by causing the BIOS to follow paths that are
 117  * not tested during Windows validation.
 118  *
 119  * Finally, there is a short list of platforms
 120  * where OSI(Linux) benefits Linux.
 121  *
 122  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
 123  * DMI is used to disable the dmesg warning about OSI(Linux)
 124  * on platforms where it is known to have no effect.
 125  * But a dmesg warning remains for systems where
 126  * we do not know if OSI(Linux) is good or bad for the system.
 127  * DMI is also used to enable OSI(Linux) for the machines
 128  * that are known to need it.
 129  *
 130  * BIOS writers should NOT query _OSI(Linux) on future systems.
 131  * It will be ignored by default, and to get Linux to
 132  * not ignore it will require a kernel source update to
 133  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
 134  */
 135 #define OSI_LINUX_ENABLE 0
 136
 137 struct osi_linux {
 138         unsigned int    enable:1;
 139         unsigned int    dmi:1;
 140         unsigned int    cmdline:1;
 141         unsigned int    known:1;
 142 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
 143
 144 static void __init acpi_request_region (struct acpi_generic_address *addr,
 145         unsigned int length, char *desc)
 146 {
 147         struct resource *res;
 148
 149         if (!addr->address || !length)
 150                 return;
 151
 152         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 153                 res = request_region(addr->address, length, desc);
 154         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 155                 res = request_mem_region(addr->address, length, desc);
 156 }
 157
 158 static int __init acpi_reserve_resources(void)
 159 {
 160         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 161                 "ACPI PM1a_EVT_BLK");
 162
 163         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 164                 "ACPI PM1b_EVT_BLK");
 165
 166         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 167                 "ACPI PM1a_CNT_BLK");
 168
 169         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 170                 "ACPI PM1b_CNT_BLK");
 171
 172         if (acpi_gbl_FADT.pm_timer_length == 4)
 173                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 174
 175         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 176                 "ACPI PM2_CNT_BLK");
 177
 178         /* Length of GPE blocks must be a non-negative multiple of 2 */
 179
 180         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 181                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 182                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 183
 184         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 185                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 186                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 187
 188         return 0;
 189 }
 190 device_initcall(acpi_reserve_resources);
 191
 192 acpi_status __init acpi_os_initialize(void)
 193 {
 194         return AE_OK;
 195 }
 196
 197 acpi_status acpi_os_initialize1(void)
 198 {
 199         /*
 200          * Initialize PCI configuration space access, as we'll need to access
 201          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 202          */
 203         if (!raw_pci_ops) {
 204                 printk(KERN_ERR PREFIX
 205                        "Access to PCI configuration space unavailable\n");
 206                 return AE_NULL_ENTRY;
 207         }
 208         kacpid_wq = create_singlethread_workqueue("kacpid");
 209         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 210         BUG_ON(!kacpid_wq);
 211         BUG_ON(!kacpi_notify_wq);
 212         return AE_OK;
 213 }
 214
 215 acpi_status acpi_os_terminate(void)
 216 {
 217         if (acpi_irq_handler) {
 218                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 219                                                  acpi_irq_handler);
 220         }
 221
 222         destroy_workqueue(kacpid_wq);
 223         destroy_workqueue(kacpi_notify_wq);
 224
 225         return AE_OK;
 226 }
 227
 228 void acpi_os_printf(const char *fmt, ...)
 229 {
 230         va_list args;
 231         va_start(args, fmt);
 232         acpi_os_vprintf(fmt, args);
 233         va_end(args);
 234 }
 235
 236 EXPORT_SYMBOL(acpi_os_printf);
 237
 238 void acpi_os_vprintf(const char *fmt, va_list args)
 239 {
 240         static char buffer[512];
 241
 242         vsprintf(buffer, fmt, args);
 243
 244 #ifdef ENABLE_DEBUGGER
 245         if (acpi_in_debugger) {
 246                 kdb_printf("%s", buffer);
 247         } else {
 248                 printk("%s", buffer);
 249         }
 250 #else
 251         printk("%s", buffer);
 252 #endif
 253 }
 254
 255 acpi_physical_address __init acpi_os_get_root_pointer(void)
 256 {
 257         if (efi_enabled) {
 258                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 259                         return efi.acpi20;
 260                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 261                         return efi.acpi;
 262                 else {
 263                         printk(KERN_ERR PREFIX
 264                                "System description tables not found\n");
 265                         return 0;
 266                 }
 267         } else
 268                 return acpi_find_rsdp();
 269 }
 270
 271 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 272 {
 273         if (phys > ULONG_MAX) {
 274                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 275                 return NULL;
 276         }
 277         if (acpi_gbl_permanent_mmap)
 278                 /*
 279                 * ioremap checks to ensure this is in reserved space
 280                 */
 281                 return ioremap((unsigned long)phys, size);
 282         else
 283                 return __acpi_map_table((unsigned long)phys, size);
 284 }
 285 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 286
 287 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 288 {
 289         if (acpi_gbl_permanent_mmap) {
 290                 iounmap(virt);
 291         }
 292 }
 293 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 294
 295 #ifdef ACPI_FUTURE_USAGE
 296 acpi_status
 297 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 298 {
 299         if (!phys || !virt)
 300                 return AE_BAD_PARAMETER;
 301
 302         *phys = virt_to_phys(virt);
 303
 304         return AE_OK;
 305 }
 306 #endif
 307
 308 #define ACPI_MAX_OVERRIDE_LEN 100
 309
 310 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 311
 312 acpi_status
 313 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 314                             acpi_string * new_val)
 315 {
 316         if (!init_val || !new_val)
 317                 return AE_BAD_PARAMETER;
 318
 319         *new_val = NULL;
 320         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 321                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 322                        acpi_os_name);
 323                 *new_val = acpi_os_name;
 324         }
 325
 326         return AE_OK;
 327 }
 328
 329 acpi_status
 330 acpi_os_table_override(struct acpi_table_header * existing_table,
 331                        struct acpi_table_header ** new_table)
 332 {
 333         if (!existing_table || !new_table)
 334                 return AE_BAD_PARAMETER;
 335
 336 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 337         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 338                 *new_table = (struct acpi_table_header *)AmlCode;
 339         else
 340                 *new_table = NULL;
 341 #else
 342         *new_table = NULL;
 343 #endif
 344         return AE_OK;
 345 }
 346
 347 static irqreturn_t acpi_irq(int irq, void *dev_id)
 348 {
 349         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 350 }
 351
 352 acpi_status
 353 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 354                                   void *context)
 355 {
 356         unsigned int irq;
 357
 358         /*
 359          * Ignore the GSI from the core, and use the value in our copy of the
 360          * FADT. It may not be the same if an interrupt source override exists
 361          * for the SCI.
 362          */
 363         gsi = acpi_gbl_FADT.sci_interrupt;
 364         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 365                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 366                        gsi);
 367                 return AE_OK;
 368         }
 369
 370         acpi_irq_handler = handler;
 371         acpi_irq_context = context;
 372         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 373                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 374                 return AE_NOT_ACQUIRED;
 375         }
 376         acpi_irq_irq = irq;
 377
 378         return AE_OK;
 379 }
 380
 381 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 382 {
 383         if (irq) {
 384                 free_irq(irq, acpi_irq);
 385                 acpi_irq_handler = NULL;
 386                 acpi_irq_irq = 0;
 387         }
 388
 389         return AE_OK;
 390 }
 391
 392 /*
 393  * Running in interpreter thread context, safe to sleep
 394  */
 395
 396 void acpi_os_sleep(acpi_integer ms)
 397 {
 398         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 399 }
 400
 401 EXPORT_SYMBOL(acpi_os_sleep);
 402
 403 void acpi_os_stall(u32 us)
 404 {
 405         while (us) {
 406                 u32 delay = 1000;
 407
 408                 if (delay > us)
 409                         delay = us;
 410                 udelay(delay);
 411                 touch_nmi_watchdog();
 412                 us -= delay;
 413         }
 414 }
 415
 416 EXPORT_SYMBOL(acpi_os_stall);
 417
 418 /*
 419  * Support ACPI 3.0 AML Timer operand
 420  * Returns 64-bit free-running, monotonically increasing timer
 421  * with 100ns granularity
 422  */
 423 u64 acpi_os_get_timer(void)
 424 {
 425         static u64 t;
 426
 427 #ifdef  CONFIG_HPET
 428         /* TBD: use HPET if available */
 429 #endif
 430
 431 #ifdef  CONFIG_X86_PM_TIMER
 432         /* TBD: default to PM timer if HPET was not available */
 433 #endif
 434         if (!t)
 435                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 436
 437         return ++t;
 438 }
 439
 440 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 441 {
 442         u32 dummy;
 443
 444         if (!value)
 445                 value = &dummy;
 446
 447         *value = 0;
 448         if (width <= 8) {
 449                 *(u8 *) value = inb(port);
 450         } else if (width <= 16) {
 451                 *(u16 *) value = inw(port);
 452         } else if (width <= 32) {
 453                 *(u32 *) value = inl(port);
 454         } else {
 455                 BUG();
 456         }
 457
 458         return AE_OK;
 459 }
 460
 461 EXPORT_SYMBOL(acpi_os_read_port);
 462
 463 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 464 {
 465         if (width <= 8) {
 466                 outb(value, port);
 467         } else if (width <= 16) {
 468                 outw(value, port);
 469         } else if (width <= 32) {
 470                 outl(value, port);
 471         } else {
 472                 BUG();
 473         }
 474
 475         return AE_OK;
 476 }
 477
 478 EXPORT_SYMBOL(acpi_os_write_port);
 479
 480 acpi_status
 481 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 482 {
 483         u32 dummy;
 484         void __iomem *virt_addr;
 485
 486         virt_addr = ioremap(phys_addr, width);
 487         if (!value)
 488                 value = &dummy;
 489
 490         switch (width) {
 491         case 8:
 492                 *(u8 *) value = readb(virt_addr);
 493                 break;
 494         case 16:
 495                 *(u16 *) value = readw(virt_addr);
 496                 break;
 497         case 32:
 498                 *(u32 *) value = readl(virt_addr);
 499                 break;
 500         default:
 501                 BUG();
 502         }
 503
 504         iounmap(virt_addr);
 505
 506         return AE_OK;
 507 }
 508
 509 acpi_status
 510 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 511 {
 512         void __iomem *virt_addr;
 513
 514         virt_addr = ioremap(phys_addr, width);
 515
 516         switch (width) {
 517         case 8:
 518                 writeb(value, virt_addr);
 519                 break;
 520         case 16:
 521                 writew(value, virt_addr);
 522                 break;
 523         case 32:
 524                 writel(value, virt_addr);
 525                 break;
 526         default:
 527                 BUG();
 528         }
 529
 530         iounmap(virt_addr);
 531
 532         return AE_OK;
 533 }
 534
 535 acpi_status
 536 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 537                                void *value, u32 width)
 538 {
 539         int result, size;
 540
 541         if (!value)
 542                 return AE_BAD_PARAMETER;
 543
 544         switch (width) {
 545         case 8:
 546                 size = 1;
 547                 break;
 548         case 16:
 549                 size = 2;
 550                 break;
 551         case 32:
 552                 size = 4;
 553                 break;
 554         default:
 555                 return AE_ERROR;
 556         }
 557
 558         BUG_ON(!raw_pci_ops);
 559
 560         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 561                                    PCI_DEVFN(pci_id->device, pci_id->function),
 562                                    reg, size, value);
 563
 564         return (result ? AE_ERROR : AE_OK);
 565 }
 566
 567 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 568
 569 acpi_status
 570 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 571                                 acpi_integer value, u32 width)
 572 {
 573         int result, size;
 574
 575         switch (width) {
 576         case 8:
 577                 size = 1;
 578                 break;
 579         case 16:
 580                 size = 2;
 581                 break;
 582         case 32:
 583                 size = 4;
 584                 break;
 585         default:
 586                 return AE_ERROR;
 587         }
 588
 589         BUG_ON(!raw_pci_ops);
 590
 591         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 592                                     PCI_DEVFN(pci_id->device, pci_id->function),
 593                                     reg, size, value);
 594
 595         return (result ? AE_ERROR : AE_OK);
 596 }
 597
 598 /* TODO: Change code to take advantage of driver model more */
 599 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 600                                     acpi_handle chandle,        /* current node */
 601                                     struct acpi_pci_id **id,
 602                                     int *is_bridge, u8 * bus_number)
 603 {
 604         acpi_handle handle;
 605         struct acpi_pci_id *pci_id = *id;
 606         acpi_status status;
 607         unsigned long temp;
 608         acpi_object_type type;
 609         u8 tu8;
 610
 611         acpi_get_parent(chandle, &handle);
 612         if (handle != rhandle) {
 613                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 614                                         bus_number);
 615
 616                 status = acpi_get_type(handle, &type);
 617                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 618                         return;
 619
 620                 status =
 621                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 622                                           &temp);
 623                 if (ACPI_SUCCESS(status)) {
 624                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 625                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 626
 627                         if (*is_bridge)
 628                                 pci_id->bus = *bus_number;
 629
 630                         /* any nicer way to get bus number of bridge ? */
 631                         status =
 632                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 633                                                            8);
 634                         if (ACPI_SUCCESS(status)
 635                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 636                                 status =
 637                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 638                                                                    &tu8, 8);
 639                                 if (!ACPI_SUCCESS(status)) {
 640                                         /* Certainly broken...  FIX ME */
 641                                         return;
 642                                 }
 643                                 *is_bridge = 1;
 644                                 pci_id->bus = tu8;
 645                                 status =
 646                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 647                                                                    &tu8, 8);
 648                                 if (ACPI_SUCCESS(status)) {
 649                                         *bus_number = tu8;
 650                                 }
 651                         } else
 652                                 *is_bridge = 0;
 653                 }
 654         }
 655 }
 656
 657 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 658                            acpi_handle chandle, /* current node */
 659                            struct acpi_pci_id **id)
 660 {
 661         int is_bridge = 1;
 662         u8 bus_number = (*id)->bus;
 663
 664         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 665 }
 666
 667 static void acpi_os_execute_deferred(struct work_struct *work)
 668 {
 669         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 670         if (!dpc) {
 671                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 672                 return;
 673         }
 674
 675         dpc->function(dpc->context);
 676         kfree(dpc);
 677
 678         /* Yield cpu to notify thread */
 679         cond_resched();
 680
 681         return;
 682 }
 683
 684 static void acpi_os_execute_notify(struct work_struct *work)
 685 {
 686         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 687
 688         if (!dpc) {
 689                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 690                 return;
 691         }
 692
 693         dpc->function(dpc->context);
 694
 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 acpi_status acpi_os_execute(acpi_execute_type type,
 716                             acpi_osd_exec_callback function, void *context)
 717 {
 718         acpi_status status = AE_OK;
 719         struct acpi_os_dpc *dpc;
 720
 721         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 722                           "Scheduling function [%p(%p)] for deferred execution.\n",
 723                           function, context));
 724
 725         if (!function)
 726                 return AE_BAD_PARAMETER;
 727
 728         /*
 729          * Allocate/initialize DPC structure.  Note that this memory will be
 730          * freed by the callee.  The kernel handles the work_struct list  in a
 731          * way that allows us to also free its memory inside the callee.
 732          * Because we may want to schedule several tasks with different
 733          * parameters we can't use the approach some kernel code uses of
 734          * having a static work_struct.
 735          */
 736
 737         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 738         if (!dpc)
 739                 return_ACPI_STATUS(AE_NO_MEMORY);
 740
 741         dpc->function = function;
 742         dpc->context = context;
 743
 744         if (type == OSL_NOTIFY_HANDLER) {
 745                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 746                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 747                         status = AE_ERROR;
 748                         kfree(dpc);
 749                 }
 750         } else {
 751                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 752                 if (!queue_work(kacpid_wq, &dpc->work)) {
 753                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 754                                   "Call to queue_work() failed.\n"));
 755                         status = AE_ERROR;
 756                         kfree(dpc);
 757                 }
 758         }
 759         return_ACPI_STATUS(status);
 760 }
 761
 762 EXPORT_SYMBOL(acpi_os_execute);
 763
 764 void acpi_os_wait_events_complete(void *context)
 765 {
 766         flush_workqueue(kacpid_wq);
 767 }
 768
 769 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 770
 771 /*
 772  * Allocate the memory for a spinlock and initialize it.
 773  */
 774 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 775 {
 776         spin_lock_init(*handle);
 777
 778         return AE_OK;
 779 }
 780
 781 /*
 782  * Deallocate the memory for a spinlock.
 783  */
 784 void acpi_os_delete_lock(acpi_spinlock handle)
 785 {
 786         return;
 787 }
 788
 789 acpi_status
 790 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 791 {
 792         struct semaphore *sem = NULL;
 793
 794
 795         sem = acpi_os_allocate(sizeof(struct semaphore));
 796         if (!sem)
 797                 return AE_NO_MEMORY;
 798         memset(sem, 0, sizeof(struct semaphore));
 799
 800         sema_init(sem, initial_units);
 801
 802         *handle = (acpi_handle *) sem;
 803
 804         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 805                           *handle, initial_units));
 806
 807         return AE_OK;
 808 }
 809
 810 EXPORT_SYMBOL(acpi_os_create_semaphore);
 811
 812 /*
 813  * TODO: A better way to delete semaphores?  Linux doesn't have a
 814  * 'delete_semaphore()' function -- may result in an invalid
 815  * pointer dereference for non-synchronized consumers.  Should
 816  * we at least check for blocked threads and signal/cancel them?
 817  */
 818
 819 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 820 {
 821         struct semaphore *sem = (struct semaphore *)handle;
 822
 823
 824         if (!sem)
 825                 return AE_BAD_PARAMETER;
 826
 827         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 828
 829         kfree(sem);
 830         sem = NULL;
 831
 832         return AE_OK;
 833 }
 834
 835 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 836
 837 /*
 838  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 839  * improvise.  The process is to sleep for one scheduler quantum
 840  * until the semaphore becomes available.  Downside is that this
 841  * may result in starvation for timeout-based waits when there's
 842  * lots of semaphore activity.
 843  *
 844  * TODO: Support for units > 1?
 845  */
 846 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 847 {
 848         acpi_status status = AE_OK;
 849         struct semaphore *sem = (struct semaphore *)handle;
 850         int ret = 0;
 851
 852
 853         if (!sem || (units < 1))
 854                 return AE_BAD_PARAMETER;
 855
 856         if (units > 1)
 857                 return AE_SUPPORT;
 858
 859         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 860                           handle, units, timeout));
 861
 862         /*
 863          * This can be called during resume with interrupts off.
 864          * Like boot-time, we should be single threaded and will
 865          * always get the lock if we try -- timeout or not.
 866          * If this doesn't succeed, then we will oops courtesy of
 867          * might_sleep() in down().
 868          */
 869         if (!down_trylock(sem))
 870                 return AE_OK;
 871
 872         switch (timeout) {
 873                 /*
 874                  * No Wait:
 875                  * --------
 876                  * A zero timeout value indicates that we shouldn't wait - just
 877                  * acquire the semaphore if available otherwise return AE_TIME
 878                  * (a.k.a. 'would block').
 879                  */
 880         case 0:
 881                 if (down_trylock(sem))
 882                         status = AE_TIME;
 883                 break;
 884
 885                 /*
 886                  * Wait Indefinitely:
 887                  * ------------------
 888                  */
 889         case ACPI_WAIT_FOREVER:
 890                 down(sem);
 891                 break;
 892
 893                 /*
 894                  * Wait w/ Timeout:
 895                  * ----------------
 896                  */
 897         default:
 898                 // TODO: A better timeout algorithm?
 899                 {
 900                         int i = 0;
 901                         static const int quantum_ms = 1000 / HZ;
 902
 903                         ret = down_trylock(sem);
 904                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 905                                 schedule_timeout_interruptible(1);
 906                                 ret = down_trylock(sem);
 907                         }
 908
 909                         if (ret != 0)
 910                                 status = AE_TIME;
 911                 }
 912                 break;
 913         }
 914
 915         if (ACPI_FAILURE(status)) {
 916                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 917                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 918                                   handle, units, timeout,
 919                                   acpi_format_exception(status)));
 920         } else {
 921                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 922                                   "Acquired semaphore[%p|%d|%d]", handle,
 923                                   units, timeout));
 924         }
 925
 926         return status;
 927 }
 928
 929 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 930
 931 /*
 932  * TODO: Support for units > 1?
 933  */
 934 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 935 {
 936         struct semaphore *sem = (struct semaphore *)handle;
 937
 938
 939         if (!sem || (units < 1))
 940                 return AE_BAD_PARAMETER;
 941
 942         if (units > 1)
 943                 return AE_SUPPORT;
 944
 945         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 946                           units));
 947
 948         up(sem);
 949
 950         return AE_OK;
 951 }
 952
 953 EXPORT_SYMBOL(acpi_os_signal_semaphore);
 954
 955 #ifdef ACPI_FUTURE_USAGE
 956 u32 acpi_os_get_line(char *buffer)
 957 {
 958
 959 #ifdef ENABLE_DEBUGGER
 960         if (acpi_in_debugger) {
 961                 u32 chars;
 962
 963                 kdb_read(buffer, sizeof(line_buf));
 964
 965                 /* remove the CR kdb includes */
 966                 chars = strlen(buffer) - 1;
 967                 buffer[chars] = '\0';
 968         }
 969 #endif
 970
 971         return 0;
 972 }
 973 #endif                          /*  ACPI_FUTURE_USAGE  */
 974
 975 acpi_status acpi_os_signal(u32 function, void *info)
 976 {
 977         switch (function) {
 978         case ACPI_SIGNAL_FATAL:
 979                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 980                 break;
 981         case ACPI_SIGNAL_BREAKPOINT:
 982                 /*
 983                  * AML Breakpoint
 984                  * ACPI spec. says to treat it as a NOP unless
 985                  * you are debugging.  So if/when we integrate
 986                  * AML debugger into the kernel debugger its
 987                  * hook will go here.  But until then it is
 988                  * not useful to print anything on breakpoints.
 989                  */
 990                 break;
 991         default:
 992                 break;
 993         }
 994
 995         return AE_OK;
 996 }
 997
 998 EXPORT_SYMBOL(acpi_os_signal);
 999
1000 static int __init acpi_os_name_setup(char *str)
1001 {
1002         char *p = acpi_os_name;
1003         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1004
1005         if (!str || !*str)
1006                 return 0;
1007
1008         for (; count-- && str && *str; str++) {
1009                 if (isalnum(*str) || *str == ' ' || *str == ':')
1010                         *p++ = *str;
1011                 else if (*str == '\'' || *str == '"')
1012                         continue;
1013                 else
1014                         break;
1015         }
1016         *p = 0;
1017
1018         return 1;
1019
1020 }
1021
1022 __setup("acpi_os_name=", acpi_os_name_setup);
1023
1024 static void __init set_osi_linux(unsigned int enable)
1025 {
1026         if (osi_linux.enable != enable) {
1027                 osi_linux.enable = enable;
1028                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1029                         enable ? "Add": "Delet");
1030         }
1031         return;
1032 }
1033
1034 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1035 {
1036         osi_linux.cmdline = 1;  /* cmdline set the default */
1037         set_osi_linux(enable);
1038
1039         return;
1040 }
1041
1042 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1043 {
1044         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1045
1046         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1047
1048         if (enable == -1)
1049                 return;
1050
1051         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1052
1053         set_osi_linux(enable);
1054
1055         return;
1056 }
1057
1058 /*
1059  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1060  *
1061  * empty string disables _OSI
1062  * string starting with '!' disables that string
1063  * otherwise string is added to list, augmenting built-in strings
1064  */
1065 static int __init acpi_osi_setup(char *str)
1066 {
1067         if (str == NULL || *str == '\0') {
1068                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1069                 acpi_gbl_create_osi_method = FALSE;
1070         } else if (!strcmp("!Linux", str)) {
1071                 acpi_cmdline_osi_linux(0);      /* !enable */
1072         } else if (*str == '!') {
1073                 if (acpi_osi_invalidate(++str) == AE_OK)
1074                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1075         } else if (!strcmp("Linux", str)) {
1076                 acpi_cmdline_osi_linux(1);      /* enable */
1077         } else if (*osi_additional_string == '\0') {
1078                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1079                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1080         }
1081
1082         return 1;
1083 }
1084
1085 __setup("acpi_osi=", acpi_osi_setup);
1086
1087 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1088 static int __init acpi_serialize_setup(char *str)
1089 {
1090         printk(KERN_INFO PREFIX "serialize enabled\n");
1091
1092         acpi_gbl_all_methods_serialized = TRUE;
1093
1094         return 1;
1095 }
1096
1097 __setup("acpi_serialize", acpi_serialize_setup);
1098
1099 /*
1100  * Wake and Run-Time GPES are expected to be separate.
1101  * We disable wake-GPEs at run-time to prevent spurious
1102  * interrupts.
1103  *
1104  * However, if a system exists that shares Wake and
1105  * Run-time events on the same GPE this flag is available
1106  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1107  */
1108 static int __init acpi_wake_gpes_always_on_setup(char *str)
1109 {
1110         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1111
1112         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1113
1114         return 1;
1115 }
1116
1117 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1118
1119 /* Check of resource interference between native drivers and ACPI
1120  * OperationRegions (SystemIO and System Memory only).
1121  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1122  * in arbitrary AML code and can interfere with legacy drivers.
1123  * acpi_enforce_resources= can be set to:
1124  *
1125  *   - strict           (2)
1126  *     -> further driver trying to access the resources will not load
1127  *   - lax (default)    (1)
1128  *     -> further driver trying to access the resources will load, but you
1129  *     get a system message that something might go wrong...
1130  *
1131  *   - no               (0)
1132  *     -> ACPI Operation Region resources will not be registered
1133  *
1134  */
1135 #define ENFORCE_RESOURCES_STRICT 2
1136 #define ENFORCE_RESOURCES_LAX    1
1137 #define ENFORCE_RESOURCES_NO     0
1138
1139 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1140
1141 static int __init acpi_enforce_resources_setup(char *str)
1142 {
1143         if (str == NULL || *str == '\0')
1144                 return 0;
1145
1146         if (!strcmp("strict", str))
1147                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1148         else if (!strcmp("lax", str))
1149                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1150         else if (!strcmp("no", str))
1151                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1152
1153         return 1;
1154 }
1155
1156 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1157
1158 /* Check for resource conflicts between ACPI OperationRegions and native
1159  * drivers */
1160 static int acpi_check_resource_conflict(struct resource *res)
1161 {
1162         struct acpi_res_list *res_list_elem;
1163         int ioport;
1164         int clash = 0;
1165
1166         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1167                 return 0;
1168         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1169                 return 0;
1170
1171         ioport = res->flags & IORESOURCE_IO;
1172
1173         spin_lock(&acpi_res_lock);
1174         list_for_each_entry(res_list_elem, &resource_list_head,
1175                             resource_list) {
1176                 if (ioport && (res_list_elem->resource_type
1177                                != ACPI_ADR_SPACE_SYSTEM_IO))
1178                         continue;
1179                 if (!ioport && (res_list_elem->resource_type
1180                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1181                         continue;
1182
1183                 if (res->end < res_list_elem->start
1184                     || res_list_elem->end < res->start)
1185                         continue;
1186                 clash = 1;
1187                 break;
1188         }
1189         spin_unlock(&acpi_res_lock);
1190
1191         if (clash) {
1192                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1193                         printk(KERN_INFO "%sACPI: %s resource %s [0x%llx-0x%llx]"
1194                                " conflicts with ACPI region %s"
1195                                " [0x%llx-0x%llx]\n",
1196                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1197                                ? KERN_WARNING : KERN_ERR,
1198                                ioport ? "I/O" : "Memory", res->name,
1199                                (long long) res->start, (long long) res->end,
1200                                res_list_elem->name,
1201                                (long long) res_list_elem->start,
1202                                (long long) res_list_elem->end);
1203                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1204                 }
1205                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1206                         return -EBUSY;
1207         }
1208         return 0;
1209 }
1210
1211 int acpi_check_region(resource_size_t start, resource_size_t n,
1212                       const char *name)
1213 {
1214         struct resource res = {
1215                 .start = start,
1216                 .end   = start + n - 1,
1217                 .name  = name,
1218                 .flags = IORESOURCE_IO,
1219         };
1220
1221         return acpi_check_resource_conflict(&res);
1222 }
1223 EXPORT_SYMBOL(acpi_check_region);
1224
1225 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1226                       const char *name)
1227 {
1228         struct resource res = {
1229                 .start = start,
1230                 .end   = start + n - 1,
1231                 .name  = name,
1232                 .flags = IORESOURCE_MEM,
1233         };
1234
1235         return acpi_check_resource_conflict(&res);
1236
1237 }
1238 EXPORT_SYMBOL(acpi_check_mem_region);
1239
1240 /*
1241  * Acquire a spinlock.
1242  *
1243  * handle is a pointer to the spinlock_t.
1244  */
1245
1246 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1247 {
1248         acpi_cpu_flags flags;
1249         spin_lock_irqsave(lockp, flags);
1250         return flags;
1251 }
1252
1253 /*
1254  * Release a spinlock. See above.
1255  */
1256
1257 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1258 {
1259         spin_unlock_irqrestore(lockp, flags);
1260 }
1261
1262 #ifndef ACPI_USE_LOCAL_CACHE
1263
1264 /*******************************************************************************
1265  *
1266  * FUNCTION:    acpi_os_create_cache
1267  *
1268  * PARAMETERS:  name      - Ascii name for the cache
1269  *              size      - Size of each cached object
1270  *              depth     - Maximum depth of the cache (in objects) <ignored>
1271  *              cache     - Where the new cache object is returned
1272  *
1273  * RETURN:      status
1274  *
1275  * DESCRIPTION: Create a cache object
1276  *
1277  ******************************************************************************/
1278
1279 acpi_status
1280 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1281 {
1282         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1283         if (*cache == NULL)
1284                 return AE_ERROR;
1285         else
1286                 return AE_OK;
1287 }
1288
1289 /*******************************************************************************
1290  *
1291  * FUNCTION:    acpi_os_purge_cache
1292  *
1293  * PARAMETERS:  Cache           - Handle to cache object
1294  *
1295  * RETURN:      Status
1296  *
1297  * DESCRIPTION: Free all objects within the requested cache.
1298  *
1299  ******************************************************************************/
1300
1301 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1302 {
1303         kmem_cache_shrink(cache);
1304         return (AE_OK);
1305 }
1306
1307 /*******************************************************************************
1308  *
1309  * FUNCTION:    acpi_os_delete_cache
1310  *
1311  * PARAMETERS:  Cache           - Handle to cache object
1312  *
1313  * RETURN:      Status
1314  *
1315  * DESCRIPTION: Free all objects within the requested cache and delete the
1316  *              cache object.
1317  *
1318  ******************************************************************************/
1319
1320 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1321 {
1322         kmem_cache_destroy(cache);
1323         return (AE_OK);
1324 }
1325
1326 /*******************************************************************************
1327  *
1328  * FUNCTION:    acpi_os_release_object
1329  *
1330  * PARAMETERS:  Cache       - Handle to cache object
1331  *              Object      - The object to be released
1332  *
1333  * RETURN:      None
1334  *
1335  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1336  *              the object is deleted.
1337  *
1338  ******************************************************************************/
1339
1340 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1341 {
1342         kmem_cache_free(cache, object);
1343         return (AE_OK);
1344 }
1345
1346 /**
1347  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1348  *
1349  *      Returns 0 on success
1350  */
1351 int acpi_dmi_dump(void)
1352 {
1353
1354         if (!dmi_available)
1355                 return -1;
1356
1357         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1358                 dmi_get_slot(DMI_SYS_VENDOR));
1359         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1360                 dmi_get_slot(DMI_PRODUCT_NAME));
1361         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1362                 dmi_get_slot(DMI_PRODUCT_VERSION));
1363         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1364                 dmi_get_slot(DMI_BOARD_NAME));
1365         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1366                 dmi_get_slot(DMI_BIOS_VENDOR));
1367         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1368                 dmi_get_slot(DMI_BIOS_DATE));
1369
1370         return 0;
1371 }
1372
1373
1374 /******************************************************************************
1375  *
1376  * FUNCTION:    acpi_os_validate_interface
1377  *
1378  * PARAMETERS:  interface           - Requested interface to be validated
1379  *
1380  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1381  *
1382  * DESCRIPTION: Match an interface string to the interfaces supported by the
1383  *              host. Strings originate from an AML call to the _OSI method.
1384  *
1385  *****************************************************************************/
1386
1387 acpi_status
1388 acpi_os_validate_interface (char *interface)
1389 {
1390         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1391                 return AE_OK;
1392         if (!strcmp("Linux", interface)) {
1393
1394                 printk(KERN_NOTICE PREFIX
1395                         "BIOS _OSI(Linux) query %s%s\n",
1396                         osi_linux.enable ? "honored" : "ignored",
1397                         osi_linux.cmdline ? " via cmdline" :
1398                         osi_linux.dmi ? " via DMI" : "");
1399
1400                 if (!osi_linux.dmi) {
1401                         if (acpi_dmi_dump())
1402                                 printk(KERN_NOTICE PREFIX
1403                                         "[please extract dmidecode output]\n");
1404                         printk(KERN_NOTICE PREFIX
1405                                 "Please send DMI info above to "
1406                                 "linux-acpi@vger.kernel.org\n");
1407                 }
1408                 if (!osi_linux.known && !osi_linux.cmdline) {
1409                         printk(KERN_NOTICE PREFIX
1410                                 "If \"acpi_osi=%sLinux\" works better, "
1411                                 "please notify linux-acpi@vger.kernel.org\n",
1412                                 osi_linux.enable ? "!" : "");
1413                 }
1414
1415                 if (osi_linux.enable)
1416                         return AE_OK;
1417         }
1418         return AE_SUPPORT;
1419 }
1420
1421 /******************************************************************************
1422  *
1423  * FUNCTION:    acpi_os_validate_address
1424  *
1425  * PARAMETERS:  space_id             - ACPI space ID
1426  *              address             - Physical address
1427  *              length              - Address length
1428  *
1429  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1430  *              should return AE_AML_ILLEGAL_ADDRESS.
1431  *
1432  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1433  *              the addresses accessed by AML operation regions.
1434  *
1435  *****************************************************************************/
1436
1437 acpi_status
1438 acpi_os_validate_address (
1439     u8                   space_id,
1440     acpi_physical_address   address,
1441     acpi_size               length,
1442     char *name)
1443 {
1444         struct acpi_res_list *res;
1445         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1446                 return AE_OK;
1447
1448         switch (space_id) {
1449         case ACPI_ADR_SPACE_SYSTEM_IO:
1450         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1451                 /* Only interference checks against SystemIO and SytemMemory
1452                    are needed */
1453                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1454                 if (!res)
1455                         return AE_OK;
1456                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1457                 strlcpy(res->name, name, 5);
1458                 res->start = address;
1459                 res->end = address + length - 1;
1460                 res->resource_type = space_id;
1461                 spin_lock(&acpi_res_lock);
1462                 list_add(&res->resource_list, &resource_list_head);
1463                 spin_unlock(&acpi_res_lock);
1464                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1465                          "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1466                          ? "SystemIO" : "System Memory",
1467                          (unsigned long long)res->start,
1468                          (unsigned long long)res->end,
1469                          res->name);
1470                 break;
1471         case ACPI_ADR_SPACE_PCI_CONFIG:
1472         case ACPI_ADR_SPACE_EC:
1473         case ACPI_ADR_SPACE_SMBUS:
1474         case ACPI_ADR_SPACE_CMOS:
1475         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1476         case ACPI_ADR_SPACE_DATA_TABLE:
1477         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1478                 break;
1479         }
1480         return AE_OK;
1481 }
1482
1483 #endif