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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 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         /*
 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 void acpi_os_vprintf(const char *fmt, va_list args)
 237 {
 238         static char buffer[512];
 239
 240         vsprintf(buffer, fmt, args);
 241
 242 #ifdef ENABLE_DEBUGGER
 243         if (acpi_in_debugger) {
 244                 kdb_printf("%s", buffer);
 245         } else {
 246                 printk("%s", buffer);
 247         }
 248 #else
 249         printk("%s", buffer);
 250 #endif
 251 }
 252
 253 acpi_physical_address __init acpi_os_get_root_pointer(void)
 254 {
 255         if (efi_enabled) {
 256                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 257                         return efi.acpi20;
 258                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 259                         return efi.acpi;
 260                 else {
 261                         printk(KERN_ERR PREFIX
 262                                "System description tables not found\n");
 263                         return 0;
 264                 }
 265         } else {
 266                 acpi_physical_address pa = 0;
 267
 268                 acpi_find_root_pointer(&pa);
 269                 return pa;
 270         }
 271 }
 272
 273 void __iomem *__init_refok
 274 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 275 {
 276         if (phys > ULONG_MAX) {
 277                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 278                 return NULL;
 279         }
 280         if (acpi_gbl_permanent_mmap)
 281                 /*
 282                 * ioremap checks to ensure this is in reserved space
 283                 */
 284                 return ioremap((unsigned long)phys, size);
 285         else
 286                 return __acpi_map_table((unsigned long)phys, size);
 287 }
 288 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 289
 290 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 291 {
 292         if (acpi_gbl_permanent_mmap) {
 293                 iounmap(virt);
 294         }
 295 }
 296 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 297
 298 #ifdef ACPI_FUTURE_USAGE
 299 acpi_status
 300 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 301 {
 302         if (!phys || !virt)
 303                 return AE_BAD_PARAMETER;
 304
 305         *phys = virt_to_phys(virt);
 306
 307         return AE_OK;
 308 }
 309 #endif
 310
 311 #define ACPI_MAX_OVERRIDE_LEN 100
 312
 313 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 314
 315 acpi_status
 316 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 317                             acpi_string * new_val)
 318 {
 319         if (!init_val || !new_val)
 320                 return AE_BAD_PARAMETER;
 321
 322         *new_val = NULL;
 323         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 324                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 325                        acpi_os_name);
 326                 *new_val = acpi_os_name;
 327         }
 328
 329         return AE_OK;
 330 }
 331
 332 acpi_status
 333 acpi_os_table_override(struct acpi_table_header * existing_table,
 334                        struct acpi_table_header ** new_table)
 335 {
 336         if (!existing_table || !new_table)
 337                 return AE_BAD_PARAMETER;
 338
 339 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 340         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 341                 *new_table = (struct acpi_table_header *)AmlCode;
 342         else
 343                 *new_table = NULL;
 344 #else
 345         *new_table = NULL;
 346 #endif
 347         return AE_OK;
 348 }
 349
 350 static irqreturn_t acpi_irq(int irq, void *dev_id)
 351 {
 352         u32 handled;
 353
 354         handled = (*acpi_irq_handler) (acpi_irq_context);
 355
 356         if (handled) {
 357                 acpi_irq_handled++;
 358                 return IRQ_HANDLED;
 359         } else
 360                 return IRQ_NONE;
 361 }
 362
 363 acpi_status
 364 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 365                                   void *context)
 366 {
 367         unsigned int irq;
 368
 369         acpi_irq_stats_init();
 370
 371         /*
 372          * Ignore the GSI from the core, and use the value in our copy of the
 373          * FADT. It may not be the same if an interrupt source override exists
 374          * for the SCI.
 375          */
 376         gsi = acpi_gbl_FADT.sci_interrupt;
 377         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 378                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 379                        gsi);
 380                 return AE_OK;
 381         }
 382
 383         acpi_irq_handler = handler;
 384         acpi_irq_context = context;
 385         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 386                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 387                 return AE_NOT_ACQUIRED;
 388         }
 389         acpi_irq_irq = irq;
 390
 391         return AE_OK;
 392 }
 393
 394 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 395 {
 396         if (irq) {
 397                 free_irq(irq, acpi_irq);
 398                 acpi_irq_handler = NULL;
 399                 acpi_irq_irq = 0;
 400         }
 401
 402         return AE_OK;
 403 }
 404
 405 /*
 406  * Running in interpreter thread context, safe to sleep
 407  */
 408
 409 void acpi_os_sleep(acpi_integer ms)
 410 {
 411         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 412 }
 413
 414 void acpi_os_stall(u32 us)
 415 {
 416         while (us) {
 417                 u32 delay = 1000;
 418
 419                 if (delay > us)
 420                         delay = us;
 421                 udelay(delay);
 422                 touch_nmi_watchdog();
 423                 us -= delay;
 424         }
 425 }
 426
 427 /*
 428  * Support ACPI 3.0 AML Timer operand
 429  * Returns 64-bit free-running, monotonically increasing timer
 430  * with 100ns granularity
 431  */
 432 u64 acpi_os_get_timer(void)
 433 {
 434         static u64 t;
 435
 436 #ifdef  CONFIG_HPET
 437         /* TBD: use HPET if available */
 438 #endif
 439
 440 #ifdef  CONFIG_X86_PM_TIMER
 441         /* TBD: default to PM timer if HPET was not available */
 442 #endif
 443         if (!t)
 444                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 445
 446         return ++t;
 447 }
 448
 449 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 450 {
 451         u32 dummy;
 452
 453         if (!value)
 454                 value = &dummy;
 455
 456         *value = 0;
 457         if (width <= 8) {
 458                 *(u8 *) value = inb(port);
 459         } else if (width <= 16) {
 460                 *(u16 *) value = inw(port);
 461         } else if (width <= 32) {
 462                 *(u32 *) value = inl(port);
 463         } else {
 464                 BUG();
 465         }
 466
 467         return AE_OK;
 468 }
 469
 470 EXPORT_SYMBOL(acpi_os_read_port);
 471
 472 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 473 {
 474         if (width <= 8) {
 475                 outb(value, port);
 476         } else if (width <= 16) {
 477                 outw(value, port);
 478         } else if (width <= 32) {
 479                 outl(value, port);
 480         } else {
 481                 BUG();
 482         }
 483
 484         return AE_OK;
 485 }
 486
 487 EXPORT_SYMBOL(acpi_os_write_port);
 488
 489 acpi_status
 490 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 491 {
 492         u32 dummy;
 493         void __iomem *virt_addr;
 494
 495         virt_addr = ioremap(phys_addr, width);
 496         if (!value)
 497                 value = &dummy;
 498
 499         switch (width) {
 500         case 8:
 501                 *(u8 *) value = readb(virt_addr);
 502                 break;
 503         case 16:
 504                 *(u16 *) value = readw(virt_addr);
 505                 break;
 506         case 32:
 507                 *(u32 *) value = readl(virt_addr);
 508                 break;
 509         default:
 510                 BUG();
 511         }
 512
 513         iounmap(virt_addr);
 514
 515         return AE_OK;
 516 }
 517
 518 acpi_status
 519 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 520 {
 521         void __iomem *virt_addr;
 522
 523         virt_addr = ioremap(phys_addr, width);
 524
 525         switch (width) {
 526         case 8:
 527                 writeb(value, virt_addr);
 528                 break;
 529         case 16:
 530                 writew(value, virt_addr);
 531                 break;
 532         case 32:
 533                 writel(value, virt_addr);
 534                 break;
 535         default:
 536                 BUG();
 537         }
 538
 539         iounmap(virt_addr);
 540
 541         return AE_OK;
 542 }
 543
 544 acpi_status
 545 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 546                                void *value, u32 width)
 547 {
 548         int result, size;
 549
 550         if (!value)
 551                 return AE_BAD_PARAMETER;
 552
 553         switch (width) {
 554         case 8:
 555                 size = 1;
 556                 break;
 557         case 16:
 558                 size = 2;
 559                 break;
 560         case 32:
 561                 size = 4;
 562                 break;
 563         default:
 564                 return AE_ERROR;
 565         }
 566
 567         BUG_ON(!raw_pci_ops);
 568
 569         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 570                                    PCI_DEVFN(pci_id->device, pci_id->function),
 571                                    reg, size, value);
 572
 573         return (result ? AE_ERROR : AE_OK);
 574 }
 575
 576 acpi_status
 577 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 578                                 acpi_integer value, u32 width)
 579 {
 580         int result, size;
 581
 582         switch (width) {
 583         case 8:
 584                 size = 1;
 585                 break;
 586         case 16:
 587                 size = 2;
 588                 break;
 589         case 32:
 590                 size = 4;
 591                 break;
 592         default:
 593                 return AE_ERROR;
 594         }
 595
 596         BUG_ON(!raw_pci_ops);
 597
 598         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 599                                     PCI_DEVFN(pci_id->device, pci_id->function),
 600                                     reg, size, value);
 601
 602         return (result ? AE_ERROR : AE_OK);
 603 }
 604
 605 /* TODO: Change code to take advantage of driver model more */
 606 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 607                                     acpi_handle chandle,        /* current node */
 608                                     struct acpi_pci_id **id,
 609                                     int *is_bridge, u8 * bus_number)
 610 {
 611         acpi_handle handle;
 612         struct acpi_pci_id *pci_id = *id;
 613         acpi_status status;
 614         unsigned long temp;
 615         acpi_object_type type;
 616         u8 tu8;
 617
 618         acpi_get_parent(chandle, &handle);
 619         if (handle != rhandle) {
 620                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 621                                         bus_number);
 622
 623                 status = acpi_get_type(handle, &type);
 624                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 625                         return;
 626
 627                 status =
 628                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 629                                           &temp);
 630                 if (ACPI_SUCCESS(status)) {
 631                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 632                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 633
 634                         if (*is_bridge)
 635                                 pci_id->bus = *bus_number;
 636
 637                         /* any nicer way to get bus number of bridge ? */
 638                         status =
 639                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 640                                                            8);
 641                         if (ACPI_SUCCESS(status)
 642                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 643                                 status =
 644                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 645                                                                    &tu8, 8);
 646                                 if (!ACPI_SUCCESS(status)) {
 647                                         /* Certainly broken...  FIX ME */
 648                                         return;
 649                                 }
 650                                 *is_bridge = 1;
 651                                 pci_id->bus = tu8;
 652                                 status =
 653                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 654                                                                    &tu8, 8);
 655                                 if (ACPI_SUCCESS(status)) {
 656                                         *bus_number = tu8;
 657                                 }
 658                         } else
 659                                 *is_bridge = 0;
 660                 }
 661         }
 662 }
 663
 664 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 665                            acpi_handle chandle, /* current node */
 666                            struct acpi_pci_id **id)
 667 {
 668         int is_bridge = 1;
 669         u8 bus_number = (*id)->bus;
 670
 671         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 672 }
 673
 674 static void acpi_os_execute_deferred(struct work_struct *work)
 675 {
 676         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 677         if (!dpc) {
 678                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 679                 return;
 680         }
 681
 682         dpc->function(dpc->context);
 683         kfree(dpc);
 684
 685         return;
 686 }
 687
 688 /*******************************************************************************
 689  *
 690  * FUNCTION:    acpi_os_execute
 691  *
 692  * PARAMETERS:  Type               - Type of the callback
 693  *              Function           - Function to be executed
 694  *              Context            - Function parameters
 695  *
 696  * RETURN:      Status
 697  *
 698  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 699  *              immediately executes function on a separate thread.
 700  *
 701  ******************************************************************************/
 702
 703 acpi_status acpi_os_execute(acpi_execute_type type,
 704                             acpi_osd_exec_callback function, void *context)
 705 {
 706         acpi_status status = AE_OK;
 707         struct acpi_os_dpc *dpc;
 708         struct workqueue_struct *queue;
 709         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 710                           "Scheduling function [%p(%p)] for deferred execution.\n",
 711                           function, context));
 712
 713         if (!function)
 714                 return AE_BAD_PARAMETER;
 715
 716         /*
 717          * Allocate/initialize DPC structure.  Note that this memory will be
 718          * freed by the callee.  The kernel handles the work_struct list  in a
 719          * way that allows us to also free its memory inside the callee.
 720          * Because we may want to schedule several tasks with different
 721          * parameters we can't use the approach some kernel code uses of
 722          * having a static work_struct.
 723          */
 724
 725         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 726         if (!dpc)
 727                 return_ACPI_STATUS(AE_NO_MEMORY);
 728
 729         dpc->function = function;
 730         dpc->context = context;
 731
 732         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 733         queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
 734         if (!queue_work(queue, &dpc->work)) {
 735                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 736                           "Call to queue_work() failed.\n"));
 737                 status = AE_ERROR;
 738                 kfree(dpc);
 739         }
 740         return_ACPI_STATUS(status);
 741 }
 742
 743 EXPORT_SYMBOL(acpi_os_execute);
 744
 745 void acpi_os_wait_events_complete(void *context)
 746 {
 747         flush_workqueue(kacpid_wq);
 748 }
 749
 750 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 751
 752 /*
 753  * Allocate the memory for a spinlock and initialize it.
 754  */
 755 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 756 {
 757         spin_lock_init(*handle);
 758
 759         return AE_OK;
 760 }
 761
 762 /*
 763  * Deallocate the memory for a spinlock.
 764  */
 765 void acpi_os_delete_lock(acpi_spinlock handle)
 766 {
 767         return;
 768 }
 769
 770 acpi_status
 771 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 772 {
 773         struct semaphore *sem = NULL;
 774
 775
 776         sem = acpi_os_allocate(sizeof(struct semaphore));
 777         if (!sem)
 778                 return AE_NO_MEMORY;
 779         memset(sem, 0, sizeof(struct semaphore));
 780
 781         sema_init(sem, initial_units);
 782
 783         *handle = (acpi_handle *) sem;
 784
 785         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 786                           *handle, initial_units));
 787
 788         return AE_OK;
 789 }
 790
 791 /*
 792  * TODO: A better way to delete semaphores?  Linux doesn't have a
 793  * 'delete_semaphore()' function -- may result in an invalid
 794  * pointer dereference for non-synchronized consumers.  Should
 795  * we at least check for blocked threads and signal/cancel them?
 796  */
 797
 798 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 799 {
 800         struct semaphore *sem = (struct semaphore *)handle;
 801
 802
 803         if (!sem)
 804                 return AE_BAD_PARAMETER;
 805
 806         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 807
 808         kfree(sem);
 809         sem = NULL;
 810
 811         return AE_OK;
 812 }
 813
 814 /*
 815  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 816  * improvise.  The process is to sleep for one scheduler quantum
 817  * until the semaphore becomes available.  Downside is that this
 818  * may result in starvation for timeout-based waits when there's
 819  * lots of semaphore activity.
 820  *
 821  * TODO: Support for units > 1?
 822  */
 823 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 824 {
 825         acpi_status status = AE_OK;
 826         struct semaphore *sem = (struct semaphore *)handle;
 827         int ret = 0;
 828
 829
 830         if (!sem || (units < 1))
 831                 return AE_BAD_PARAMETER;
 832
 833         if (units > 1)
 834                 return AE_SUPPORT;
 835
 836         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 837                           handle, units, timeout));
 838
 839         /*
 840          * This can be called during resume with interrupts off.
 841          * Like boot-time, we should be single threaded and will
 842          * always get the lock if we try -- timeout or not.
 843          * If this doesn't succeed, then we will oops courtesy of
 844          * might_sleep() in down().
 845          */
 846         if (!down_trylock(sem))
 847                 return AE_OK;
 848
 849         switch (timeout) {
 850                 /*
 851                  * No Wait:
 852                  * --------
 853                  * A zero timeout value indicates that we shouldn't wait - just
 854                  * acquire the semaphore if available otherwise return AE_TIME
 855                  * (a.k.a. 'would block').
 856                  */
 857         case 0:
 858                 if (down_trylock(sem))
 859                         status = AE_TIME;
 860                 break;
 861
 862                 /*
 863                  * Wait Indefinitely:
 864                  * ------------------
 865                  */
 866         case ACPI_WAIT_FOREVER:
 867                 down(sem);
 868                 break;
 869
 870                 /*
 871                  * Wait w/ Timeout:
 872                  * ----------------
 873                  */
 874         default:
 875                 // TODO: A better timeout algorithm?
 876                 {
 877                         int i = 0;
 878                         static const int quantum_ms = 1000 / HZ;
 879
 880                         ret = down_trylock(sem);
 881                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 882                                 schedule_timeout_interruptible(1);
 883                                 ret = down_trylock(sem);
 884                         }
 885
 886                         if (ret != 0)
 887                                 status = AE_TIME;
 888                 }
 889                 break;
 890         }
 891
 892         if (ACPI_FAILURE(status)) {
 893                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 894                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 895                                   handle, units, timeout,
 896                                   acpi_format_exception(status)));
 897         } else {
 898                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 899                                   "Acquired semaphore[%p|%d|%d]", handle,
 900                                   units, timeout));
 901         }
 902
 903         return status;
 904 }
 905
 906 /*
 907  * TODO: Support for units > 1?
 908  */
 909 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 910 {
 911         struct semaphore *sem = (struct semaphore *)handle;
 912
 913
 914         if (!sem || (units < 1))
 915                 return AE_BAD_PARAMETER;
 916
 917         if (units > 1)
 918                 return AE_SUPPORT;
 919
 920         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 921                           units));
 922
 923         up(sem);
 924
 925         return AE_OK;
 926 }
 927
 928 #ifdef ACPI_FUTURE_USAGE
 929 u32 acpi_os_get_line(char *buffer)
 930 {
 931
 932 #ifdef ENABLE_DEBUGGER
 933         if (acpi_in_debugger) {
 934                 u32 chars;
 935
 936                 kdb_read(buffer, sizeof(line_buf));
 937
 938                 /* remove the CR kdb includes */
 939                 chars = strlen(buffer) - 1;
 940                 buffer[chars] = '\0';
 941         }
 942 #endif
 943
 944         return 0;
 945 }
 946 #endif                          /*  ACPI_FUTURE_USAGE  */
 947
 948 acpi_status acpi_os_signal(u32 function, void *info)
 949 {
 950         switch (function) {
 951         case ACPI_SIGNAL_FATAL:
 952                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 953                 break;
 954         case ACPI_SIGNAL_BREAKPOINT:
 955                 /*
 956                  * AML Breakpoint
 957                  * ACPI spec. says to treat it as a NOP unless
 958                  * you are debugging.  So if/when we integrate
 959                  * AML debugger into the kernel debugger its
 960                  * hook will go here.  But until then it is
 961                  * not useful to print anything on breakpoints.
 962                  */
 963                 break;
 964         default:
 965                 break;
 966         }
 967
 968         return AE_OK;
 969 }
 970
 971 static int __init acpi_os_name_setup(char *str)
 972 {
 973         char *p = acpi_os_name;
 974         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 975
 976         if (!str || !*str)
 977                 return 0;
 978
 979         for (; count-- && str && *str; str++) {
 980                 if (isalnum(*str) || *str == ' ' || *str == ':')
 981                         *p++ = *str;
 982                 else if (*str == '\'' || *str == '"')
 983                         continue;
 984                 else
 985                         break;
 986         }
 987         *p = 0;
 988
 989         return 1;
 990
 991 }
 992
 993 __setup("acpi_os_name=", acpi_os_name_setup);
 994
 995 static void __init set_osi_linux(unsigned int enable)
 996 {
 997         if (osi_linux.enable != enable) {
 998                 osi_linux.enable = enable;
 999                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1000                         enable ? "Add": "Delet");
1001         }
1002         return;
1003 }
1004
1005 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1006 {
1007         osi_linux.cmdline = 1;  /* cmdline set the default */
1008         set_osi_linux(enable);
1009
1010         return;
1011 }
1012
1013 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1014 {
1015         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1016
1017         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1018
1019         if (enable == -1)
1020                 return;
1021
1022         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1023
1024         set_osi_linux(enable);
1025
1026         return;
1027 }
1028
1029 /*
1030  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1031  *
1032  * empty string disables _OSI
1033  * string starting with '!' disables that string
1034  * otherwise string is added to list, augmenting built-in strings
1035  */
1036 static int __init acpi_osi_setup(char *str)
1037 {
1038         if (str == NULL || *str == '\0') {
1039                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1040                 acpi_gbl_create_osi_method = FALSE;
1041         } else if (!strcmp("!Linux", str)) {
1042                 acpi_cmdline_osi_linux(0);      /* !enable */
1043         } else if (*str == '!') {
1044                 if (acpi_osi_invalidate(++str) == AE_OK)
1045                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1046         } else if (!strcmp("Linux", str)) {
1047                 acpi_cmdline_osi_linux(1);      /* enable */
1048         } else if (*osi_additional_string == '\0') {
1049                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1050                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1051         }
1052
1053         return 1;
1054 }
1055
1056 __setup("acpi_osi=", acpi_osi_setup);
1057
1058 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1059 static int __init acpi_serialize_setup(char *str)
1060 {
1061         printk(KERN_INFO PREFIX "serialize enabled\n");
1062
1063         acpi_gbl_all_methods_serialized = TRUE;
1064
1065         return 1;
1066 }
1067
1068 __setup("acpi_serialize", acpi_serialize_setup);
1069
1070 /*
1071  * Wake and Run-Time GPES are expected to be separate.
1072  * We disable wake-GPEs at run-time to prevent spurious
1073  * interrupts.
1074  *
1075  * However, if a system exists that shares Wake and
1076  * Run-time events on the same GPE this flag is available
1077  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1078  */
1079 static int __init acpi_wake_gpes_always_on_setup(char *str)
1080 {
1081         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1082
1083         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1084
1085         return 1;
1086 }
1087
1088 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1089
1090 /* Check of resource interference between native drivers and ACPI
1091  * OperationRegions (SystemIO and System Memory only).
1092  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1093  * in arbitrary AML code and can interfere with legacy drivers.
1094  * acpi_enforce_resources= can be set to:
1095  *
1096  *   - strict           (2)
1097  *     -> further driver trying to access the resources will not load
1098  *   - lax (default)    (1)
1099  *     -> further driver trying to access the resources will load, but you
1100  *     get a system message that something might go wrong...
1101  *
1102  *   - no               (0)
1103  *     -> ACPI Operation Region resources will not be registered
1104  *
1105  */
1106 #define ENFORCE_RESOURCES_STRICT 2
1107 #define ENFORCE_RESOURCES_LAX    1
1108 #define ENFORCE_RESOURCES_NO     0
1109
1110 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1111
1112 static int __init acpi_enforce_resources_setup(char *str)
1113 {
1114         if (str == NULL || *str == '\0')
1115                 return 0;
1116
1117         if (!strcmp("strict", str))
1118                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1119         else if (!strcmp("lax", str))
1120                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1121         else if (!strcmp("no", str))
1122                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1123
1124         return 1;
1125 }
1126
1127 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1128
1129 /* Check for resource conflicts between ACPI OperationRegions and native
1130  * drivers */
1131 int acpi_check_resource_conflict(struct resource *res)
1132 {
1133         struct acpi_res_list *res_list_elem;
1134         int ioport;
1135         int clash = 0;
1136
1137         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1138                 return 0;
1139         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1140                 return 0;
1141
1142         ioport = res->flags & IORESOURCE_IO;
1143
1144         spin_lock(&acpi_res_lock);
1145         list_for_each_entry(res_list_elem, &resource_list_head,
1146                             resource_list) {
1147                 if (ioport && (res_list_elem->resource_type
1148                                != ACPI_ADR_SPACE_SYSTEM_IO))
1149                         continue;
1150                 if (!ioport && (res_list_elem->resource_type
1151                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1152                         continue;
1153
1154                 if (res->end < res_list_elem->start
1155                     || res_list_elem->end < res->start)
1156                         continue;
1157                 clash = 1;
1158                 break;
1159         }
1160         spin_unlock(&acpi_res_lock);
1161
1162         if (clash) {
1163                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1164                         printk(KERN_INFO "%sACPI: %s resource %s [0x%llx-0x%llx]"
1165                                " conflicts with ACPI region %s"
1166                                " [0x%llx-0x%llx]\n",
1167                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1168                                ? KERN_WARNING : KERN_ERR,
1169                                ioport ? "I/O" : "Memory", res->name,
1170                                (long long) res->start, (long long) res->end,
1171                                res_list_elem->name,
1172                                (long long) res_list_elem->start,
1173                                (long long) res_list_elem->end);
1174                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1175                 }
1176                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1177                         return -EBUSY;
1178         }
1179         return 0;
1180 }
1181 EXPORT_SYMBOL(acpi_check_resource_conflict);
1182
1183 int acpi_check_region(resource_size_t start, resource_size_t n,
1184                       const char *name)
1185 {
1186         struct resource res = {
1187                 .start = start,
1188                 .end   = start + n - 1,
1189                 .name  = name,
1190                 .flags = IORESOURCE_IO,
1191         };
1192
1193         return acpi_check_resource_conflict(&res);
1194 }
1195 EXPORT_SYMBOL(acpi_check_region);
1196
1197 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1198                       const char *name)
1199 {
1200         struct resource res = {
1201                 .start = start,
1202                 .end   = start + n - 1,
1203                 .name  = name,
1204                 .flags = IORESOURCE_MEM,
1205         };
1206
1207         return acpi_check_resource_conflict(&res);
1208
1209 }
1210 EXPORT_SYMBOL(acpi_check_mem_region);
1211
1212 /*
1213  * Acquire a spinlock.
1214  *
1215  * handle is a pointer to the spinlock_t.
1216  */
1217
1218 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1219 {
1220         acpi_cpu_flags flags;
1221         spin_lock_irqsave(lockp, flags);
1222         return flags;
1223 }
1224
1225 /*
1226  * Release a spinlock. See above.
1227  */
1228
1229 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1230 {
1231         spin_unlock_irqrestore(lockp, flags);
1232 }
1233
1234 #ifndef ACPI_USE_LOCAL_CACHE
1235
1236 /*******************************************************************************
1237  *
1238  * FUNCTION:    acpi_os_create_cache
1239  *
1240  * PARAMETERS:  name      - Ascii name for the cache
1241  *              size      - Size of each cached object
1242  *              depth     - Maximum depth of the cache (in objects) <ignored>
1243  *              cache     - Where the new cache object is returned
1244  *
1245  * RETURN:      status
1246  *
1247  * DESCRIPTION: Create a cache object
1248  *
1249  ******************************************************************************/
1250
1251 acpi_status
1252 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1253 {
1254         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1255         if (*cache == NULL)
1256                 return AE_ERROR;
1257         else
1258                 return AE_OK;
1259 }
1260
1261 /*******************************************************************************
1262  *
1263  * FUNCTION:    acpi_os_purge_cache
1264  *
1265  * PARAMETERS:  Cache           - Handle to cache object
1266  *
1267  * RETURN:      Status
1268  *
1269  * DESCRIPTION: Free all objects within the requested cache.
1270  *
1271  ******************************************************************************/
1272
1273 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1274 {
1275         kmem_cache_shrink(cache);
1276         return (AE_OK);
1277 }
1278
1279 /*******************************************************************************
1280  *
1281  * FUNCTION:    acpi_os_delete_cache
1282  *
1283  * PARAMETERS:  Cache           - Handle to cache object
1284  *
1285  * RETURN:      Status
1286  *
1287  * DESCRIPTION: Free all objects within the requested cache and delete the
1288  *              cache object.
1289  *
1290  ******************************************************************************/
1291
1292 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1293 {
1294         kmem_cache_destroy(cache);
1295         return (AE_OK);
1296 }
1297
1298 /*******************************************************************************
1299  *
1300  * FUNCTION:    acpi_os_release_object
1301  *
1302  * PARAMETERS:  Cache       - Handle to cache object
1303  *              Object      - The object to be released
1304  *
1305  * RETURN:      None
1306  *
1307  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1308  *              the object is deleted.
1309  *
1310  ******************************************************************************/
1311
1312 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1313 {
1314         kmem_cache_free(cache, object);
1315         return (AE_OK);
1316 }
1317
1318 /**
1319  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1320  *
1321  *      Returns 0 on success
1322  */
1323 static int acpi_dmi_dump(void)
1324 {
1325
1326         if (!dmi_available)
1327                 return -1;
1328
1329         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1330                 dmi_get_system_info(DMI_SYS_VENDOR));
1331         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1332                 dmi_get_system_info(DMI_PRODUCT_NAME));
1333         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1334                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1335         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1336                 dmi_get_system_info(DMI_BOARD_NAME));
1337         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1338                 dmi_get_system_info(DMI_BIOS_VENDOR));
1339         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1340                 dmi_get_system_info(DMI_BIOS_DATE));
1341
1342         return 0;
1343 }
1344
1345
1346 /******************************************************************************
1347  *
1348  * FUNCTION:    acpi_os_validate_interface
1349  *
1350  * PARAMETERS:  interface           - Requested interface to be validated
1351  *
1352  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1353  *
1354  * DESCRIPTION: Match an interface string to the interfaces supported by the
1355  *              host. Strings originate from an AML call to the _OSI method.
1356  *
1357  *****************************************************************************/
1358
1359 acpi_status
1360 acpi_os_validate_interface (char *interface)
1361 {
1362         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1363                 return AE_OK;
1364         if (!strcmp("Linux", interface)) {
1365
1366                 printk(KERN_NOTICE PREFIX
1367                         "BIOS _OSI(Linux) query %s%s\n",
1368                         osi_linux.enable ? "honored" : "ignored",
1369                         osi_linux.cmdline ? " via cmdline" :
1370                         osi_linux.dmi ? " via DMI" : "");
1371
1372                 if (!osi_linux.dmi) {
1373                         if (acpi_dmi_dump())
1374                                 printk(KERN_NOTICE PREFIX
1375                                         "[please extract dmidecode output]\n");
1376                         printk(KERN_NOTICE PREFIX
1377                                 "Please send DMI info above to "
1378                                 "linux-acpi@vger.kernel.org\n");
1379                 }
1380                 if (!osi_linux.known && !osi_linux.cmdline) {
1381                         printk(KERN_NOTICE PREFIX
1382                                 "If \"acpi_osi=%sLinux\" works better, "
1383                                 "please notify linux-acpi@vger.kernel.org\n",
1384                                 osi_linux.enable ? "!" : "");
1385                 }
1386
1387                 if (osi_linux.enable)
1388                         return AE_OK;
1389         }
1390         return AE_SUPPORT;
1391 }
1392
1393 /******************************************************************************
1394  *
1395  * FUNCTION:    acpi_os_validate_address
1396  *
1397  * PARAMETERS:  space_id             - ACPI space ID
1398  *              address             - Physical address
1399  *              length              - Address length
1400  *
1401  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1402  *              should return AE_AML_ILLEGAL_ADDRESS.
1403  *
1404  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1405  *              the addresses accessed by AML operation regions.
1406  *
1407  *****************************************************************************/
1408
1409 acpi_status
1410 acpi_os_validate_address (
1411     u8                   space_id,
1412     acpi_physical_address   address,
1413     acpi_size               length,
1414     char *name)
1415 {
1416         struct acpi_res_list *res;
1417         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1418                 return AE_OK;
1419
1420         switch (space_id) {
1421         case ACPI_ADR_SPACE_SYSTEM_IO:
1422         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1423                 /* Only interference checks against SystemIO and SytemMemory
1424                    are needed */
1425                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1426                 if (!res)
1427                         return AE_OK;
1428                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1429                 strlcpy(res->name, name, 5);
1430                 res->start = address;
1431                 res->end = address + length - 1;
1432                 res->resource_type = space_id;
1433                 spin_lock(&acpi_res_lock);
1434                 list_add(&res->resource_list, &resource_list_head);
1435                 spin_unlock(&acpi_res_lock);
1436                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1437                          "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1438                          ? "SystemIO" : "System Memory",
1439                          (unsigned long long)res->start,
1440                          (unsigned long long)res->end,
1441                          res->name);
1442                 break;
1443         case ACPI_ADR_SPACE_PCI_CONFIG:
1444         case ACPI_ADR_SPACE_EC:
1445         case ACPI_ADR_SPACE_SMBUS:
1446         case ACPI_ADR_SPACE_CMOS:
1447         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1448         case ACPI_ADR_SPACE_DATA_TABLE:
1449         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1450                 break;
1451         }
1452         return AE_OK;
1453 }
1454
1455 #endif