drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *
   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 static 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         kacpid_wq = create_singlethread_workqueue("kacpid");
 200         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 201         BUG_ON(!kacpid_wq);
 202         BUG_ON(!kacpi_notify_wq);
 203         return AE_OK;
 204 }
 205
 206 acpi_status acpi_os_terminate(void)
 207 {
 208         if (acpi_irq_handler) {
 209                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 210                                                  acpi_irq_handler);
 211         }
 212
 213         destroy_workqueue(kacpid_wq);
 214         destroy_workqueue(kacpi_notify_wq);
 215
 216         return AE_OK;
 217 }
 218
 219 void acpi_os_printf(const char *fmt, ...)
 220 {
 221         va_list args;
 222         va_start(args, fmt);
 223         acpi_os_vprintf(fmt, args);
 224         va_end(args);
 225 }
 226
 227 void acpi_os_vprintf(const char *fmt, va_list args)
 228 {
 229         static char buffer[512];
 230
 231         vsprintf(buffer, fmt, args);
 232
 233 #ifdef ENABLE_DEBUGGER
 234         if (acpi_in_debugger) {
 235                 kdb_printf("%s", buffer);
 236         } else {
 237                 printk("%s", buffer);
 238         }
 239 #else
 240         printk("%s", buffer);
 241 #endif
 242 }
 243
 244 acpi_physical_address __init acpi_os_get_root_pointer(void)
 245 {
 246         if (efi_enabled) {
 247                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 248                         return efi.acpi20;
 249                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 250                         return efi.acpi;
 251                 else {
 252                         printk(KERN_ERR PREFIX
 253                                "System description tables not found\n");
 254                         return 0;
 255                 }
 256         } else {
 257                 acpi_physical_address pa = 0;
 258
 259                 acpi_find_root_pointer(&pa);
 260                 return pa;
 261         }
 262 }
 263
 264 void __iomem *__init_refok
 265 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 266 {
 267         if (phys > ULONG_MAX) {
 268                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 269                 return NULL;
 270         }
 271         if (acpi_gbl_permanent_mmap)
 272                 /*
 273                 * ioremap checks to ensure this is in reserved space
 274                 */
 275                 return ioremap((unsigned long)phys, size);
 276         else
 277                 return __acpi_map_table((unsigned long)phys, size);
 278 }
 279 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 280
 281 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 282 {
 283         if (acpi_gbl_permanent_mmap) {
 284                 iounmap(virt);
 285         }
 286 }
 287 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 288
 289 #ifdef ACPI_FUTURE_USAGE
 290 acpi_status
 291 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 292 {
 293         if (!phys || !virt)
 294                 return AE_BAD_PARAMETER;
 295
 296         *phys = virt_to_phys(virt);
 297
 298         return AE_OK;
 299 }
 300 #endif
 301
 302 #define ACPI_MAX_OVERRIDE_LEN 100
 303
 304 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 305
 306 acpi_status
 307 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 308                             acpi_string * new_val)
 309 {
 310         if (!init_val || !new_val)
 311                 return AE_BAD_PARAMETER;
 312
 313         *new_val = NULL;
 314         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 315                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 316                        acpi_os_name);
 317                 *new_val = acpi_os_name;
 318         }
 319
 320         return AE_OK;
 321 }
 322
 323 acpi_status
 324 acpi_os_table_override(struct acpi_table_header * existing_table,
 325                        struct acpi_table_header ** new_table)
 326 {
 327         if (!existing_table || !new_table)
 328                 return AE_BAD_PARAMETER;
 329
 330         *new_table = NULL;
 331
 332 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 333         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 334                 *new_table = (struct acpi_table_header *)AmlCode;
 335 #endif
 336         if (*new_table != NULL) {
 337                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 338                            "this is unsafe: tainting kernel\n",
 339                        existing_table->signature,
 340                        existing_table->oem_table_id);
 341                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 342         }
 343         return AE_OK;
 344 }
 345
 346 static irqreturn_t acpi_irq(int irq, void *dev_id)
 347 {
 348         u32 handled;
 349
 350         handled = (*acpi_irq_handler) (acpi_irq_context);
 351
 352         if (handled) {
 353                 acpi_irq_handled++;
 354                 return IRQ_HANDLED;
 355         } else
 356                 return IRQ_NONE;
 357 }
 358
 359 acpi_status
 360 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 361                                   void *context)
 362 {
 363         unsigned int irq;
 364
 365         acpi_irq_stats_init();
 366
 367         /*
 368          * Ignore the GSI from the core, and use the value in our copy of the
 369          * FADT. It may not be the same if an interrupt source override exists
 370          * for the SCI.
 371          */
 372         gsi = acpi_gbl_FADT.sci_interrupt;
 373         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 374                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 375                        gsi);
 376                 return AE_OK;
 377         }
 378
 379         acpi_irq_handler = handler;
 380         acpi_irq_context = context;
 381         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 382                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 383                 return AE_NOT_ACQUIRED;
 384         }
 385         acpi_irq_irq = irq;
 386
 387         return AE_OK;
 388 }
 389
 390 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 391 {
 392         if (irq) {
 393                 free_irq(irq, acpi_irq);
 394                 acpi_irq_handler = NULL;
 395                 acpi_irq_irq = 0;
 396         }
 397
 398         return AE_OK;
 399 }
 400
 401 /*
 402  * Running in interpreter thread context, safe to sleep
 403  */
 404
 405 void acpi_os_sleep(acpi_integer ms)
 406 {
 407         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 408 }
 409
 410 void acpi_os_stall(u32 us)
 411 {
 412         while (us) {
 413                 u32 delay = 1000;
 414
 415                 if (delay > us)
 416                         delay = us;
 417                 udelay(delay);
 418                 touch_nmi_watchdog();
 419                 us -= delay;
 420         }
 421 }
 422
 423 /*
 424  * Support ACPI 3.0 AML Timer operand
 425  * Returns 64-bit free-running, monotonically increasing timer
 426  * with 100ns granularity
 427  */
 428 u64 acpi_os_get_timer(void)
 429 {
 430         static u64 t;
 431
 432 #ifdef  CONFIG_HPET
 433         /* TBD: use HPET if available */
 434 #endif
 435
 436 #ifdef  CONFIG_X86_PM_TIMER
 437         /* TBD: default to PM timer if HPET was not available */
 438 #endif
 439         if (!t)
 440                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 441
 442         return ++t;
 443 }
 444
 445 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 446 {
 447         u32 dummy;
 448
 449         if (!value)
 450                 value = &dummy;
 451
 452         *value = 0;
 453         if (width <= 8) {
 454                 *(u8 *) value = inb(port);
 455         } else if (width <= 16) {
 456                 *(u16 *) value = inw(port);
 457         } else if (width <= 32) {
 458                 *(u32 *) value = inl(port);
 459         } else {
 460                 BUG();
 461         }
 462
 463         return AE_OK;
 464 }
 465
 466 EXPORT_SYMBOL(acpi_os_read_port);
 467
 468 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 469 {
 470         if (width <= 8) {
 471                 outb(value, port);
 472         } else if (width <= 16) {
 473                 outw(value, port);
 474         } else if (width <= 32) {
 475                 outl(value, port);
 476         } else {
 477                 BUG();
 478         }
 479
 480         return AE_OK;
 481 }
 482
 483 EXPORT_SYMBOL(acpi_os_write_port);
 484
 485 acpi_status
 486 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 487 {
 488         u32 dummy;
 489         void __iomem *virt_addr;
 490
 491         virt_addr = ioremap(phys_addr, width);
 492         if (!value)
 493                 value = &dummy;
 494
 495         switch (width) {
 496         case 8:
 497                 *(u8 *) value = readb(virt_addr);
 498                 break;
 499         case 16:
 500                 *(u16 *) value = readw(virt_addr);
 501                 break;
 502         case 32:
 503                 *(u32 *) value = readl(virt_addr);
 504                 break;
 505         default:
 506                 BUG();
 507         }
 508
 509         iounmap(virt_addr);
 510
 511         return AE_OK;
 512 }
 513
 514 acpi_status
 515 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 516 {
 517         void __iomem *virt_addr;
 518
 519         virt_addr = ioremap(phys_addr, width);
 520
 521         switch (width) {
 522         case 8:
 523                 writeb(value, virt_addr);
 524                 break;
 525         case 16:
 526                 writew(value, virt_addr);
 527                 break;
 528         case 32:
 529                 writel(value, virt_addr);
 530                 break;
 531         default:
 532                 BUG();
 533         }
 534
 535         iounmap(virt_addr);
 536
 537         return AE_OK;
 538 }
 539
 540 acpi_status
 541 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 542                                u32 *value, u32 width)
 543 {
 544         int result, size;
 545
 546         if (!value)
 547                 return AE_BAD_PARAMETER;
 548
 549         switch (width) {
 550         case 8:
 551                 size = 1;
 552                 break;
 553         case 16:
 554                 size = 2;
 555                 break;
 556         case 32:
 557                 size = 4;
 558                 break;
 559         default:
 560                 return AE_ERROR;
 561         }
 562
 563         result = raw_pci_read(pci_id->segment, pci_id->bus,
 564                                 PCI_DEVFN(pci_id->device, pci_id->function),
 565                                 reg, size, value);
 566
 567         return (result ? AE_ERROR : AE_OK);
 568 }
 569
 570 acpi_status
 571 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 572                                 acpi_integer value, u32 width)
 573 {
 574         int result, size;
 575
 576         switch (width) {
 577         case 8:
 578                 size = 1;
 579                 break;
 580         case 16:
 581                 size = 2;
 582                 break;
 583         case 32:
 584                 size = 4;
 585                 break;
 586         default:
 587                 return AE_ERROR;
 588         }
 589
 590         result = raw_pci_write(pci_id->segment, pci_id->bus,
 591                                 PCI_DEVFN(pci_id->device, pci_id->function),
 592                                 reg, size, value);
 593
 594         return (result ? AE_ERROR : AE_OK);
 595 }
 596
 597 /* TODO: Change code to take advantage of driver model more */
 598 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 599                                     acpi_handle chandle,        /* current node */
 600                                     struct acpi_pci_id **id,
 601                                     int *is_bridge, u8 * bus_number)
 602 {
 603         acpi_handle handle;
 604         struct acpi_pci_id *pci_id = *id;
 605         acpi_status status;
 606         unsigned long temp;
 607         acpi_object_type type;
 608
 609         acpi_get_parent(chandle, &handle);
 610         if (handle != rhandle) {
 611                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 612                                         bus_number);
 613
 614                 status = acpi_get_type(handle, &type);
 615                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 616                         return;
 617
 618                 status =
 619                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 620                                           &temp);
 621                 if (ACPI_SUCCESS(status)) {
 622                         u32 val;
 623                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 624                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 625
 626                         if (*is_bridge)
 627                                 pci_id->bus = *bus_number;
 628
 629                         /* any nicer way to get bus number of bridge ? */
 630                         status =
 631                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 632                                                            8);
 633                         if (ACPI_SUCCESS(status)
 634                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 635                                 status =
 636                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 637                                                                    &val, 8);
 638                                 if (!ACPI_SUCCESS(status)) {
 639                                         /* Certainly broken...  FIX ME */
 640                                         return;
 641                                 }
 642                                 *is_bridge = 1;
 643                                 pci_id->bus = val;
 644                                 status =
 645                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 646                                                                    &val, 8);
 647                                 if (ACPI_SUCCESS(status)) {
 648                                         *bus_number = val;
 649                                 }
 650                         } else
 651                                 *is_bridge = 0;
 652                 }
 653         }
 654 }
 655
 656 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 657                            acpi_handle chandle, /* current node */
 658                            struct acpi_pci_id **id)
 659 {
 660         int is_bridge = 1;
 661         u8 bus_number = (*id)->bus;
 662
 663         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 664 }
 665
 666 static void acpi_os_execute_deferred(struct work_struct *work)
 667 {
 668         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 669         if (!dpc) {
 670                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 671                 return;
 672         }
 673
 674         dpc->function(dpc->context);
 675         kfree(dpc);
 676
 677         return;
 678 }
 679
 680 /*******************************************************************************
 681  *
 682  * FUNCTION:    acpi_os_execute
 683  *
 684  * PARAMETERS:  Type               - Type of the callback
 685  *              Function           - Function to be executed
 686  *              Context            - Function parameters
 687  *
 688  * RETURN:      Status
 689  *
 690  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 691  *              immediately executes function on a separate thread.
 692  *
 693  ******************************************************************************/
 694
 695 acpi_status acpi_os_execute(acpi_execute_type type,
 696                             acpi_osd_exec_callback function, void *context)
 697 {
 698         acpi_status status = AE_OK;
 699         struct acpi_os_dpc *dpc;
 700         struct workqueue_struct *queue;
 701         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 702                           "Scheduling function [%p(%p)] for deferred execution.\n",
 703                           function, context));
 704
 705         if (!function)
 706                 return AE_BAD_PARAMETER;
 707
 708         /*
 709          * Allocate/initialize DPC structure.  Note that this memory will be
 710          * freed by the callee.  The kernel handles the work_struct list  in a
 711          * way that allows us to also free its memory inside the callee.
 712          * Because we may want to schedule several tasks with different
 713          * parameters we can't use the approach some kernel code uses of
 714          * having a static work_struct.
 715          */
 716
 717         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 718         if (!dpc)
 719                 return_ACPI_STATUS(AE_NO_MEMORY);
 720
 721         dpc->function = function;
 722         dpc->context = context;
 723
 724         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 725         queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
 726         if (!queue_work(queue, &dpc->work)) {
 727                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 728                           "Call to queue_work() failed.\n"));
 729                 status = AE_ERROR;
 730                 kfree(dpc);
 731         }
 732         return_ACPI_STATUS(status);
 733 }
 734
 735 EXPORT_SYMBOL(acpi_os_execute);
 736
 737 void acpi_os_wait_events_complete(void *context)
 738 {
 739         flush_workqueue(kacpid_wq);
 740 }
 741
 742 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 743
 744 /*
 745  * Allocate the memory for a spinlock and initialize it.
 746  */
 747 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 748 {
 749         spin_lock_init(*handle);
 750
 751         return AE_OK;
 752 }
 753
 754 /*
 755  * Deallocate the memory for a spinlock.
 756  */
 757 void acpi_os_delete_lock(acpi_spinlock handle)
 758 {
 759         return;
 760 }
 761
 762 acpi_status
 763 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 764 {
 765         struct semaphore *sem = NULL;
 766
 767
 768         sem = acpi_os_allocate(sizeof(struct semaphore));
 769         if (!sem)
 770                 return AE_NO_MEMORY;
 771         memset(sem, 0, sizeof(struct semaphore));
 772
 773         sema_init(sem, initial_units);
 774
 775         *handle = (acpi_handle *) sem;
 776
 777         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 778                           *handle, initial_units));
 779
 780         return AE_OK;
 781 }
 782
 783 /*
 784  * TODO: A better way to delete semaphores?  Linux doesn't have a
 785  * 'delete_semaphore()' function -- may result in an invalid
 786  * pointer dereference for non-synchronized consumers.  Should
 787  * we at least check for blocked threads and signal/cancel them?
 788  */
 789
 790 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 791 {
 792         struct semaphore *sem = (struct semaphore *)handle;
 793
 794
 795         if (!sem)
 796                 return AE_BAD_PARAMETER;
 797
 798         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 799
 800         kfree(sem);
 801         sem = NULL;
 802
 803         return AE_OK;
 804 }
 805
 806 /*
 807  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 808  * improvise.  The process is to sleep for one scheduler quantum
 809  * until the semaphore becomes available.  Downside is that this
 810  * may result in starvation for timeout-based waits when there's
 811  * lots of semaphore activity.
 812  *
 813  * TODO: Support for units > 1?
 814  */
 815 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 816 {
 817         acpi_status status = AE_OK;
 818         struct semaphore *sem = (struct semaphore *)handle;
 819         int ret = 0;
 820
 821
 822         if (!sem || (units < 1))
 823                 return AE_BAD_PARAMETER;
 824
 825         if (units > 1)
 826                 return AE_SUPPORT;
 827
 828         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 829                           handle, units, timeout));
 830
 831         /*
 832          * This can be called during resume with interrupts off.
 833          * Like boot-time, we should be single threaded and will
 834          * always get the lock if we try -- timeout or not.
 835          * If this doesn't succeed, then we will oops courtesy of
 836          * might_sleep() in down().
 837          */
 838         if (!down_trylock(sem))
 839                 return AE_OK;
 840
 841         switch (timeout) {
 842                 /*
 843                  * No Wait:
 844                  * --------
 845                  * A zero timeout value indicates that we shouldn't wait - just
 846                  * acquire the semaphore if available otherwise return AE_TIME
 847                  * (a.k.a. 'would block').
 848                  */
 849         case 0:
 850                 if (down_trylock(sem))
 851                         status = AE_TIME;
 852                 break;
 853
 854                 /*
 855                  * Wait Indefinitely:
 856                  * ------------------
 857                  */
 858         case ACPI_WAIT_FOREVER:
 859                 down(sem);
 860                 break;
 861
 862                 /*
 863                  * Wait w/ Timeout:
 864                  * ----------------
 865                  */
 866         default:
 867                 // TODO: A better timeout algorithm?
 868                 {
 869                         int i = 0;
 870                         static const int quantum_ms = 1000 / HZ;
 871
 872                         ret = down_trylock(sem);
 873                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 874                                 schedule_timeout_interruptible(1);
 875                                 ret = down_trylock(sem);
 876                         }
 877
 878                         if (ret != 0)
 879                                 status = AE_TIME;
 880                 }
 881                 break;
 882         }
 883
 884         if (ACPI_FAILURE(status)) {
 885                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 886                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 887                                   handle, units, timeout,
 888                                   acpi_format_exception(status)));
 889         } else {
 890                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 891                                   "Acquired semaphore[%p|%d|%d]", handle,
 892                                   units, timeout));
 893         }
 894
 895         return status;
 896 }
 897
 898 /*
 899  * TODO: Support for units > 1?
 900  */
 901 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 902 {
 903         struct semaphore *sem = (struct semaphore *)handle;
 904
 905
 906         if (!sem || (units < 1))
 907                 return AE_BAD_PARAMETER;
 908
 909         if (units > 1)
 910                 return AE_SUPPORT;
 911
 912         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 913                           units));
 914
 915         up(sem);
 916
 917         return AE_OK;
 918 }
 919
 920 #ifdef ACPI_FUTURE_USAGE
 921 u32 acpi_os_get_line(char *buffer)
 922 {
 923
 924 #ifdef ENABLE_DEBUGGER
 925         if (acpi_in_debugger) {
 926                 u32 chars;
 927
 928                 kdb_read(buffer, sizeof(line_buf));
 929
 930                 /* remove the CR kdb includes */
 931                 chars = strlen(buffer) - 1;
 932                 buffer[chars] = '\0';
 933         }
 934 #endif
 935
 936         return 0;
 937 }
 938 #endif                          /*  ACPI_FUTURE_USAGE  */
 939
 940 acpi_status acpi_os_signal(u32 function, void *info)
 941 {
 942         switch (function) {
 943         case ACPI_SIGNAL_FATAL:
 944                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 945                 break;
 946         case ACPI_SIGNAL_BREAKPOINT:
 947                 /*
 948                  * AML Breakpoint
 949                  * ACPI spec. says to treat it as a NOP unless
 950                  * you are debugging.  So if/when we integrate
 951                  * AML debugger into the kernel debugger its
 952                  * hook will go here.  But until then it is
 953                  * not useful to print anything on breakpoints.
 954                  */
 955                 break;
 956         default:
 957                 break;
 958         }
 959
 960         return AE_OK;
 961 }
 962
 963 static int __init acpi_os_name_setup(char *str)
 964 {
 965         char *p = acpi_os_name;
 966         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 967
 968         if (!str || !*str)
 969                 return 0;
 970
 971         for (; count-- && str && *str; str++) {
 972                 if (isalnum(*str) || *str == ' ' || *str == ':')
 973                         *p++ = *str;
 974                 else if (*str == '\'' || *str == '"')
 975                         continue;
 976                 else
 977                         break;
 978         }
 979         *p = 0;
 980
 981         return 1;
 982
 983 }
 984
 985 __setup("acpi_os_name=", acpi_os_name_setup);
 986
 987 static void __init set_osi_linux(unsigned int enable)
 988 {
 989         if (osi_linux.enable != enable) {
 990                 osi_linux.enable = enable;
 991                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
 992                         enable ? "Add": "Delet");
 993         }
 994         return;
 995 }
 996
 997 static void __init acpi_cmdline_osi_linux(unsigned int enable)
 998 {
 999         osi_linux.cmdline = 1;  /* cmdline set the default */
1000         set_osi_linux(enable);
1001
1002         return;
1003 }
1004
1005 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1006 {
1007         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1008
1009         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1010
1011         if (enable == -1)
1012                 return;
1013
1014         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1015
1016         set_osi_linux(enable);
1017
1018         return;
1019 }
1020
1021 /*
1022  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1023  *
1024  * empty string disables _OSI
1025  * string starting with '!' disables that string
1026  * otherwise string is added to list, augmenting built-in strings
1027  */
1028 int __init acpi_osi_setup(char *str)
1029 {
1030         if (str == NULL || *str == '\0') {
1031                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1032                 acpi_gbl_create_osi_method = FALSE;
1033         } else if (!strcmp("!Linux", str)) {
1034                 acpi_cmdline_osi_linux(0);      /* !enable */
1035         } else if (*str == '!') {
1036                 if (acpi_osi_invalidate(++str) == AE_OK)
1037                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1038         } else if (!strcmp("Linux", str)) {
1039                 acpi_cmdline_osi_linux(1);      /* enable */
1040         } else if (*osi_additional_string == '\0') {
1041                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1042                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1043         }
1044
1045         return 1;
1046 }
1047
1048 __setup("acpi_osi=", acpi_osi_setup);
1049
1050 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1051 static int __init acpi_serialize_setup(char *str)
1052 {
1053         printk(KERN_INFO PREFIX "serialize enabled\n");
1054
1055         acpi_gbl_all_methods_serialized = TRUE;
1056
1057         return 1;
1058 }
1059
1060 __setup("acpi_serialize", acpi_serialize_setup);
1061
1062 /*
1063  * Wake and Run-Time GPES are expected to be separate.
1064  * We disable wake-GPEs at run-time to prevent spurious
1065  * interrupts.
1066  *
1067  * However, if a system exists that shares Wake and
1068  * Run-time events on the same GPE this flag is available
1069  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1070  */
1071 static int __init acpi_wake_gpes_always_on_setup(char *str)
1072 {
1073         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1074
1075         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1076
1077         return 1;
1078 }
1079
1080 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1081
1082 /* Check of resource interference between native drivers and ACPI
1083  * OperationRegions (SystemIO and System Memory only).
1084  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1085  * in arbitrary AML code and can interfere with legacy drivers.
1086  * acpi_enforce_resources= can be set to:
1087  *
1088  *   - strict           (2)
1089  *     -> further driver trying to access the resources will not load
1090  *   - lax (default)    (1)
1091  *     -> further driver trying to access the resources will load, but you
1092  *     get a system message that something might go wrong...
1093  *
1094  *   - no               (0)
1095  *     -> ACPI Operation Region resources will not be registered
1096  *
1097  */
1098 #define ENFORCE_RESOURCES_STRICT 2
1099 #define ENFORCE_RESOURCES_LAX    1
1100 #define ENFORCE_RESOURCES_NO     0
1101
1102 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1103
1104 static int __init acpi_enforce_resources_setup(char *str)
1105 {
1106         if (str == NULL || *str == '\0')
1107                 return 0;
1108
1109         if (!strcmp("strict", str))
1110                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1111         else if (!strcmp("lax", str))
1112                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1113         else if (!strcmp("no", str))
1114                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1115
1116         return 1;
1117 }
1118
1119 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1120
1121 /* Check for resource conflicts between ACPI OperationRegions and native
1122  * drivers */
1123 int acpi_check_resource_conflict(struct resource *res)
1124 {
1125         struct acpi_res_list *res_list_elem;
1126         int ioport;
1127         int clash = 0;
1128
1129         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1130                 return 0;
1131         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1132                 return 0;
1133
1134         ioport = res->flags & IORESOURCE_IO;
1135
1136         spin_lock(&acpi_res_lock);
1137         list_for_each_entry(res_list_elem, &resource_list_head,
1138                             resource_list) {
1139                 if (ioport && (res_list_elem->resource_type
1140                                != ACPI_ADR_SPACE_SYSTEM_IO))
1141                         continue;
1142                 if (!ioport && (res_list_elem->resource_type
1143                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1144                         continue;
1145
1146                 if (res->end < res_list_elem->start
1147                     || res_list_elem->end < res->start)
1148                         continue;
1149                 clash = 1;
1150                 break;
1151         }
1152         spin_unlock(&acpi_res_lock);
1153
1154         if (clash) {
1155                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1156                         printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1157                                " conflicts with ACPI region %s"
1158                                " [0x%llx-0x%llx]\n",
1159                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1160                                ? KERN_WARNING : KERN_ERR,
1161                                ioport ? "I/O" : "Memory", res->name,
1162                                (long long) res->start, (long long) res->end,
1163                                res_list_elem->name,
1164                                (long long) res_list_elem->start,
1165                                (long long) res_list_elem->end);
1166                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1167                 }
1168                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1169                         return -EBUSY;
1170         }
1171         return 0;
1172 }
1173 EXPORT_SYMBOL(acpi_check_resource_conflict);
1174
1175 int acpi_check_region(resource_size_t start, resource_size_t n,
1176                       const char *name)
1177 {
1178         struct resource res = {
1179                 .start = start,
1180                 .end   = start + n - 1,
1181                 .name  = name,
1182                 .flags = IORESOURCE_IO,
1183         };
1184
1185         return acpi_check_resource_conflict(&res);
1186 }
1187 EXPORT_SYMBOL(acpi_check_region);
1188
1189 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1190                       const char *name)
1191 {
1192         struct resource res = {
1193                 .start = start,
1194                 .end   = start + n - 1,
1195                 .name  = name,
1196                 .flags = IORESOURCE_MEM,
1197         };
1198
1199         return acpi_check_resource_conflict(&res);
1200
1201 }
1202 EXPORT_SYMBOL(acpi_check_mem_region);
1203
1204 /*
1205  * Acquire a spinlock.
1206  *
1207  * handle is a pointer to the spinlock_t.
1208  */
1209
1210 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1211 {
1212         acpi_cpu_flags flags;
1213         spin_lock_irqsave(lockp, flags);
1214         return flags;
1215 }
1216
1217 /*
1218  * Release a spinlock. See above.
1219  */
1220
1221 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1222 {
1223         spin_unlock_irqrestore(lockp, flags);
1224 }
1225
1226 #ifndef ACPI_USE_LOCAL_CACHE
1227
1228 /*******************************************************************************
1229  *
1230  * FUNCTION:    acpi_os_create_cache
1231  *
1232  * PARAMETERS:  name      - Ascii name for the cache
1233  *              size      - Size of each cached object
1234  *              depth     - Maximum depth of the cache (in objects) <ignored>
1235  *              cache     - Where the new cache object is returned
1236  *
1237  * RETURN:      status
1238  *
1239  * DESCRIPTION: Create a cache object
1240  *
1241  ******************************************************************************/
1242
1243 acpi_status
1244 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1245 {
1246         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1247         if (*cache == NULL)
1248                 return AE_ERROR;
1249         else
1250                 return AE_OK;
1251 }
1252
1253 /*******************************************************************************
1254  *
1255  * FUNCTION:    acpi_os_purge_cache
1256  *
1257  * PARAMETERS:  Cache           - Handle to cache object
1258  *
1259  * RETURN:      Status
1260  *
1261  * DESCRIPTION: Free all objects within the requested cache.
1262  *
1263  ******************************************************************************/
1264
1265 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1266 {
1267         kmem_cache_shrink(cache);
1268         return (AE_OK);
1269 }
1270
1271 /*******************************************************************************
1272  *
1273  * FUNCTION:    acpi_os_delete_cache
1274  *
1275  * PARAMETERS:  Cache           - Handle to cache object
1276  *
1277  * RETURN:      Status
1278  *
1279  * DESCRIPTION: Free all objects within the requested cache and delete the
1280  *              cache object.
1281  *
1282  ******************************************************************************/
1283
1284 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1285 {
1286         kmem_cache_destroy(cache);
1287         return (AE_OK);
1288 }
1289
1290 /*******************************************************************************
1291  *
1292  * FUNCTION:    acpi_os_release_object
1293  *
1294  * PARAMETERS:  Cache       - Handle to cache object
1295  *              Object      - The object to be released
1296  *
1297  * RETURN:      None
1298  *
1299  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1300  *              the object is deleted.
1301  *
1302  ******************************************************************************/
1303
1304 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1305 {
1306         kmem_cache_free(cache, object);
1307         return (AE_OK);
1308 }
1309
1310 /**
1311  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1312  *
1313  *      Returns 0 on success
1314  */
1315 static int acpi_dmi_dump(void)
1316 {
1317
1318         if (!dmi_available)
1319                 return -1;
1320
1321         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1322                 dmi_get_system_info(DMI_SYS_VENDOR));
1323         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1324                 dmi_get_system_info(DMI_PRODUCT_NAME));
1325         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1326                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1327         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1328                 dmi_get_system_info(DMI_BOARD_NAME));
1329         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1330                 dmi_get_system_info(DMI_BIOS_VENDOR));
1331         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1332                 dmi_get_system_info(DMI_BIOS_DATE));
1333
1334         return 0;
1335 }
1336
1337
1338 /******************************************************************************
1339  *
1340  * FUNCTION:    acpi_os_validate_interface
1341  *
1342  * PARAMETERS:  interface           - Requested interface to be validated
1343  *
1344  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1345  *
1346  * DESCRIPTION: Match an interface string to the interfaces supported by the
1347  *              host. Strings originate from an AML call to the _OSI method.
1348  *
1349  *****************************************************************************/
1350
1351 acpi_status
1352 acpi_os_validate_interface (char *interface)
1353 {
1354         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1355                 return AE_OK;
1356         if (!strcmp("Linux", interface)) {
1357
1358                 printk(KERN_NOTICE PREFIX
1359                         "BIOS _OSI(Linux) query %s%s\n",
1360                         osi_linux.enable ? "honored" : "ignored",
1361                         osi_linux.cmdline ? " via cmdline" :
1362                         osi_linux.dmi ? " via DMI" : "");
1363
1364                 if (!osi_linux.dmi) {
1365                         if (acpi_dmi_dump())
1366                                 printk(KERN_NOTICE PREFIX
1367                                         "[please extract dmidecode output]\n");
1368                         printk(KERN_NOTICE PREFIX
1369                                 "Please send DMI info above to "
1370                                 "linux-acpi@vger.kernel.org\n");
1371                 }
1372                 if (!osi_linux.known && !osi_linux.cmdline) {
1373                         printk(KERN_NOTICE PREFIX
1374                                 "If \"acpi_osi=%sLinux\" works better, "
1375                                 "please notify linux-acpi@vger.kernel.org\n",
1376                                 osi_linux.enable ? "!" : "");
1377                 }
1378
1379                 if (osi_linux.enable)
1380                         return AE_OK;
1381         }
1382         return AE_SUPPORT;
1383 }
1384
1385 /******************************************************************************
1386  *
1387  * FUNCTION:    acpi_os_validate_address
1388  *
1389  * PARAMETERS:  space_id             - ACPI space ID
1390  *              address             - Physical address
1391  *              length              - Address length
1392  *
1393  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1394  *              should return AE_AML_ILLEGAL_ADDRESS.
1395  *
1396  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1397  *              the addresses accessed by AML operation regions.
1398  *
1399  *****************************************************************************/
1400
1401 acpi_status
1402 acpi_os_validate_address (
1403     u8                   space_id,
1404     acpi_physical_address   address,
1405     acpi_size               length,
1406     char *name)
1407 {
1408         struct acpi_res_list *res;
1409         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1410                 return AE_OK;
1411
1412         switch (space_id) {
1413         case ACPI_ADR_SPACE_SYSTEM_IO:
1414         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1415                 /* Only interference checks against SystemIO and SytemMemory
1416                    are needed */
1417                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1418                 if (!res)
1419                         return AE_OK;
1420                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1421                 strlcpy(res->name, name, 5);
1422                 res->start = address;
1423                 res->end = address + length - 1;
1424                 res->resource_type = space_id;
1425                 spin_lock(&acpi_res_lock);
1426                 list_add(&res->resource_list, &resource_list_head);
1427                 spin_unlock(&acpi_res_lock);
1428                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1429                          "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1430                          ? "SystemIO" : "System Memory",
1431                          (unsigned long long)res->start,
1432                          (unsigned long long)res->end,
1433                          res->name);
1434                 break;
1435         case ACPI_ADR_SPACE_PCI_CONFIG:
1436         case ACPI_ADR_SPACE_EC:
1437         case ACPI_ADR_SPACE_SMBUS:
1438         case ACPI_ADR_SPACE_CMOS:
1439         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1440         case ACPI_ADR_SPACE_DATA_TABLE:
1441         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1442                 break;
1443         }
1444         return AE_OK;
1445 }
1446
1447 #endif