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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 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
  95 static int acpi_no_initrd_override;
  96 #endif
  97
  98 /*
  99  * "Ode to _OSI(Linux)"
 100  *
 101  * osi_linux -- Control response to BIOS _OSI(Linux) query.
 102  *
 103  * As Linux evolves, the features that it supports change.
 104  * So an OSI string such as "Linux" is not specific enough
 105  * to be useful across multiple versions of Linux.  It
 106  * doesn't identify any particular feature, interface,
 107  * or even any particular version of Linux...
 108  *
 109  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
 110  * to a BIOS _OSI(Linux) query.  When
 111  * a reference mobile BIOS started using it, its use
 112  * started to spread to many vendor platforms.
 113  * As it is not supportable, we need to halt that spread.
 114  *
 115  * Today, most BIOS references to _OSI(Linux) are noise --
 116  * they have no functional effect and are just dead code
 117  * carried over from the reference BIOS.
 118  *
 119  * The next most common case is that _OSI(Linux) harms Linux,
 120  * usually by causing the BIOS to follow paths that are
 121  * not tested during Windows validation.
 122  *
 123  * Finally, there is a short list of platforms
 124  * where OSI(Linux) benefits Linux.
 125  *
 126  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
 127  * DMI is used to disable the dmesg warning about OSI(Linux)
 128  * on platforms where it is known to have no effect.
 129  * But a dmesg warning remains for systems where
 130  * we do not know if OSI(Linux) is good or bad for the system.
 131  * DMI is also used to enable OSI(Linux) for the machines
 132  * that are known to need it.
 133  *
 134  * BIOS writers should NOT query _OSI(Linux) on future systems.
 135  * It will be ignored by default, and to get Linux to
 136  * not ignore it will require a kernel source update to
 137  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
 138  */
 139 #define OSI_LINUX_ENABLE 0
 140
 141 static struct osi_linux {
 142         unsigned int    enable:1;
 143         unsigned int    dmi:1;
 144         unsigned int    cmdline:1;
 145         unsigned int    known:1;
 146 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
 147
 148 static void __init acpi_request_region (struct acpi_generic_address *addr,
 149         unsigned int length, char *desc)
 150 {
 151         struct resource *res;
 152
 153         if (!addr->address || !length)
 154                 return;
 155
 156         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 157                 res = request_region(addr->address, length, desc);
 158         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 159                 res = request_mem_region(addr->address, length, desc);
 160 }
 161
 162 static int __init acpi_reserve_resources(void)
 163 {
 164         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 165                 "ACPI PM1a_EVT_BLK");
 166
 167         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 168                 "ACPI PM1b_EVT_BLK");
 169
 170         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 171                 "ACPI PM1a_CNT_BLK");
 172
 173         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 174                 "ACPI PM1b_CNT_BLK");
 175
 176         if (acpi_gbl_FADT.pm_timer_length == 4)
 177                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 178
 179         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 180                 "ACPI PM2_CNT_BLK");
 181
 182         /* Length of GPE blocks must be a non-negative multiple of 2 */
 183
 184         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 185                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 186                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 187
 188         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 189                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 190                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 191
 192         return 0;
 193 }
 194 device_initcall(acpi_reserve_resources);
 195
 196 acpi_status __init acpi_os_initialize(void)
 197 {
 198         return AE_OK;
 199 }
 200
 201 acpi_status acpi_os_initialize1(void)
 202 {
 203         /*
 204          * Initialize PCI configuration space access, as we'll need to access
 205          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 206          */
 207         if (!raw_pci_ops) {
 208                 printk(KERN_ERR PREFIX
 209                        "Access to PCI configuration space unavailable\n");
 210                 return AE_NULL_ENTRY;
 211         }
 212         kacpid_wq = create_singlethread_workqueue("kacpid");
 213         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 214         BUG_ON(!kacpid_wq);
 215         BUG_ON(!kacpi_notify_wq);
 216         return AE_OK;
 217 }
 218
 219 acpi_status acpi_os_terminate(void)
 220 {
 221         if (acpi_irq_handler) {
 222                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 223                                                  acpi_irq_handler);
 224         }
 225
 226         destroy_workqueue(kacpid_wq);
 227         destroy_workqueue(kacpi_notify_wq);
 228
 229         return AE_OK;
 230 }
 231
 232 void acpi_os_printf(const char *fmt, ...)
 233 {
 234         va_list args;
 235         va_start(args, fmt);
 236         acpi_os_vprintf(fmt, args);
 237         va_end(args);
 238 }
 239
 240 void acpi_os_vprintf(const char *fmt, va_list args)
 241 {
 242         static char buffer[512];
 243
 244         vsprintf(buffer, fmt, args);
 245
 246 #ifdef ENABLE_DEBUGGER
 247         if (acpi_in_debugger) {
 248                 kdb_printf("%s", buffer);
 249         } else {
 250                 printk("%s", buffer);
 251         }
 252 #else
 253         printk("%s", buffer);
 254 #endif
 255 }
 256
 257 acpi_physical_address __init acpi_os_get_root_pointer(void)
 258 {
 259         if (efi_enabled) {
 260                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 261                         return efi.acpi20;
 262                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 263                         return efi.acpi;
 264                 else {
 265                         printk(KERN_ERR PREFIX
 266                                "System description tables not found\n");
 267                         return 0;
 268                 }
 269         } else {
 270                 acpi_physical_address pa = 0;
 271
 272                 acpi_find_root_pointer(&pa);
 273                 return pa;
 274         }
 275 }
 276
 277 void __iomem *__init_refok
 278 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 279 {
 280         if (phys > ULONG_MAX) {
 281                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 282                 return NULL;
 283         }
 284         if (acpi_gbl_permanent_mmap)
 285                 /*
 286                 * ioremap checks to ensure this is in reserved space
 287                 */
 288                 return ioremap((unsigned long)phys, size);
 289         else
 290                 return __acpi_map_table((unsigned long)phys, size);
 291 }
 292 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 293
 294 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 295 {
 296         if (acpi_gbl_permanent_mmap) {
 297                 iounmap(virt);
 298         }
 299 }
 300 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 301
 302 #ifdef ACPI_FUTURE_USAGE
 303 acpi_status
 304 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 305 {
 306         if (!phys || !virt)
 307                 return AE_BAD_PARAMETER;
 308
 309         *phys = virt_to_phys(virt);
 310
 311         return AE_OK;
 312 }
 313 #endif
 314
 315 #define ACPI_MAX_OVERRIDE_LEN 100
 316
 317 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 318
 319 acpi_status
 320 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 321                             acpi_string * new_val)
 322 {
 323         if (!init_val || !new_val)
 324                 return AE_BAD_PARAMETER;
 325
 326         *new_val = NULL;
 327         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 328                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 329                        acpi_os_name);
 330                 *new_val = acpi_os_name;
 331         }
 332
 333         return AE_OK;
 334 }
 335
 336 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
 337 struct acpi_table_header *acpi_find_dsdt_initrd(void)
 338 {
 339         struct file *firmware_file;
 340         mm_segment_t oldfs;
 341         unsigned long len, len2;
 342         struct acpi_table_header *dsdt_buffer, *ret = NULL;
 343         struct kstat stat;
 344         char *ramfs_dsdt_name = "/DSDT.aml";
 345
 346         printk(KERN_INFO PREFIX "Checking initramfs for custom DSDT");
 347
 348         /*
 349          * Never do this at home, only the user-space is allowed to open a file.
 350          * The clean way would be to use the firmware loader.
 351          * But this code must be run before there is any userspace available.
 352          * A static/init firmware infrastructure doesn't exist yet...
 353          */
 354         if (vfs_stat(ramfs_dsdt_name, &stat) < 0)
 355                 return ret;
 356
 357         len = stat.size;
 358         /* check especially against empty files */
 359         if (len <= 4) {
 360                 printk(KERN_ERR PREFIX "Failed: DSDT only %lu bytes.\n", len);
 361                 return ret;
 362         }
 363
 364         firmware_file = filp_open(ramfs_dsdt_name, O_RDONLY, 0);
 365         if (IS_ERR(firmware_file)) {
 366                 printk(KERN_ERR PREFIX "Failed to open %s.\n", ramfs_dsdt_name);
 367                 return ret;
 368         }
 369
 370         dsdt_buffer = kmalloc(len, GFP_ATOMIC);
 371         if (!dsdt_buffer) {
 372                 printk(KERN_ERR PREFIX "Failed to allocate %lu bytes.\n", len);
 373                 goto err;
 374         }
 375
 376         oldfs = get_fs();
 377         set_fs(KERNEL_DS);
 378         len2 = vfs_read(firmware_file, (char __user *)dsdt_buffer, len,
 379                 &firmware_file->f_pos);
 380         set_fs(oldfs);
 381         if (len2 < len) {
 382                 printk(KERN_ERR PREFIX "Failed to read %lu bytes from %s.\n",
 383                         len, ramfs_dsdt_name);
 384                 ACPI_FREE(dsdt_buffer);
 385                 goto err;
 386         }
 387
 388         printk(KERN_INFO PREFIX "Found %lu byte DSDT in %s.\n",
 389                         len, ramfs_dsdt_name);
 390         ret = dsdt_buffer;
 391 err:
 392         filp_close(firmware_file, NULL);
 393         return ret;
 394 }
 395 #endif
 396
 397 acpi_status
 398 acpi_os_table_override(struct acpi_table_header * existing_table,
 399                        struct acpi_table_header ** new_table)
 400 {
 401         if (!existing_table || !new_table)
 402                 return AE_BAD_PARAMETER;
 403
 404         *new_table = NULL;
 405
 406 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 407         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 408                 *new_table = (struct acpi_table_header *)AmlCode;
 409 #endif
 410 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
 411         if ((strncmp(existing_table->signature, "DSDT", 4) == 0) &&
 412             !acpi_no_initrd_override) {
 413                 struct acpi_table_header *initrd_table;
 414
 415                 initrd_table = acpi_find_dsdt_initrd();
 416                 if (initrd_table)
 417                         *new_table = initrd_table;
 418         }
 419 #endif
 420         if (*new_table != NULL) {
 421                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 422                            "this is unsafe: tainting kernel\n",
 423                        existing_table->signature,
 424                        existing_table->oem_table_id);
 425                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 426         }
 427         return AE_OK;
 428 }
 429
 430 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
 431 int __init acpi_no_initrd_override_setup(char *s)
 432 {
 433         acpi_no_initrd_override = 1;
 434         return 1;
 435 }
 436 __setup("acpi_no_initrd_override", acpi_no_initrd_override_setup);
 437 #endif
 438
 439 static irqreturn_t acpi_irq(int irq, void *dev_id)
 440 {
 441         u32 handled;
 442
 443         handled = (*acpi_irq_handler) (acpi_irq_context);
 444
 445         if (handled) {
 446                 acpi_irq_handled++;
 447                 return IRQ_HANDLED;
 448         } else
 449                 return IRQ_NONE;
 450 }
 451
 452 acpi_status
 453 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 454                                   void *context)
 455 {
 456         unsigned int irq;
 457
 458         acpi_irq_stats_init();
 459
 460         /*
 461          * Ignore the GSI from the core, and use the value in our copy of the
 462          * FADT. It may not be the same if an interrupt source override exists
 463          * for the SCI.
 464          */
 465         gsi = acpi_gbl_FADT.sci_interrupt;
 466         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 467                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 468                        gsi);
 469                 return AE_OK;
 470         }
 471
 472         acpi_irq_handler = handler;
 473         acpi_irq_context = context;
 474         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 475                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 476                 return AE_NOT_ACQUIRED;
 477         }
 478         acpi_irq_irq = irq;
 479
 480         return AE_OK;
 481 }
 482
 483 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 484 {
 485         if (irq) {
 486                 free_irq(irq, acpi_irq);
 487                 acpi_irq_handler = NULL;
 488                 acpi_irq_irq = 0;
 489         }
 490
 491         return AE_OK;
 492 }
 493
 494 /*
 495  * Running in interpreter thread context, safe to sleep
 496  */
 497
 498 void acpi_os_sleep(acpi_integer ms)
 499 {
 500         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 501 }
 502
 503 void acpi_os_stall(u32 us)
 504 {
 505         while (us) {
 506                 u32 delay = 1000;
 507
 508                 if (delay > us)
 509                         delay = us;
 510                 udelay(delay);
 511                 touch_nmi_watchdog();
 512                 us -= delay;
 513         }
 514 }
 515
 516 /*
 517  * Support ACPI 3.0 AML Timer operand
 518  * Returns 64-bit free-running, monotonically increasing timer
 519  * with 100ns granularity
 520  */
 521 u64 acpi_os_get_timer(void)
 522 {
 523         static u64 t;
 524
 525 #ifdef  CONFIG_HPET
 526         /* TBD: use HPET if available */
 527 #endif
 528
 529 #ifdef  CONFIG_X86_PM_TIMER
 530         /* TBD: default to PM timer if HPET was not available */
 531 #endif
 532         if (!t)
 533                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 534
 535         return ++t;
 536 }
 537
 538 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 539 {
 540         u32 dummy;
 541
 542         if (!value)
 543                 value = &dummy;
 544
 545         *value = 0;
 546         if (width <= 8) {
 547                 *(u8 *) value = inb(port);
 548         } else if (width <= 16) {
 549                 *(u16 *) value = inw(port);
 550         } else if (width <= 32) {
 551                 *(u32 *) value = inl(port);
 552         } else {
 553                 BUG();
 554         }
 555
 556         return AE_OK;
 557 }
 558
 559 EXPORT_SYMBOL(acpi_os_read_port);
 560
 561 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 562 {
 563         if (width <= 8) {
 564                 outb(value, port);
 565         } else if (width <= 16) {
 566                 outw(value, port);
 567         } else if (width <= 32) {
 568                 outl(value, port);
 569         } else {
 570                 BUG();
 571         }
 572
 573         return AE_OK;
 574 }
 575
 576 EXPORT_SYMBOL(acpi_os_write_port);
 577
 578 acpi_status
 579 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 580 {
 581         u32 dummy;
 582         void __iomem *virt_addr;
 583
 584         virt_addr = ioremap(phys_addr, width);
 585         if (!value)
 586                 value = &dummy;
 587
 588         switch (width) {
 589         case 8:
 590                 *(u8 *) value = readb(virt_addr);
 591                 break;
 592         case 16:
 593                 *(u16 *) value = readw(virt_addr);
 594                 break;
 595         case 32:
 596                 *(u32 *) value = readl(virt_addr);
 597                 break;
 598         default:
 599                 BUG();
 600         }
 601
 602         iounmap(virt_addr);
 603
 604         return AE_OK;
 605 }
 606
 607 acpi_status
 608 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 609 {
 610         void __iomem *virt_addr;
 611
 612         virt_addr = ioremap(phys_addr, width);
 613
 614         switch (width) {
 615         case 8:
 616                 writeb(value, virt_addr);
 617                 break;
 618         case 16:
 619                 writew(value, virt_addr);
 620                 break;
 621         case 32:
 622                 writel(value, virt_addr);
 623                 break;
 624         default:
 625                 BUG();
 626         }
 627
 628         iounmap(virt_addr);
 629
 630         return AE_OK;
 631 }
 632
 633 acpi_status
 634 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 635                                void *value, u32 width)
 636 {
 637         int result, size;
 638
 639         if (!value)
 640                 return AE_BAD_PARAMETER;
 641
 642         switch (width) {
 643         case 8:
 644                 size = 1;
 645                 break;
 646         case 16:
 647                 size = 2;
 648                 break;
 649         case 32:
 650                 size = 4;
 651                 break;
 652         default:
 653                 return AE_ERROR;
 654         }
 655
 656         BUG_ON(!raw_pci_ops);
 657
 658         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 659                                    PCI_DEVFN(pci_id->device, pci_id->function),
 660                                    reg, size, value);
 661
 662         return (result ? AE_ERROR : AE_OK);
 663 }
 664
 665 acpi_status
 666 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 667                                 acpi_integer value, u32 width)
 668 {
 669         int result, size;
 670
 671         switch (width) {
 672         case 8:
 673                 size = 1;
 674                 break;
 675         case 16:
 676                 size = 2;
 677                 break;
 678         case 32:
 679                 size = 4;
 680                 break;
 681         default:
 682                 return AE_ERROR;
 683         }
 684
 685         BUG_ON(!raw_pci_ops);
 686
 687         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 688                                     PCI_DEVFN(pci_id->device, pci_id->function),
 689                                     reg, size, value);
 690
 691         return (result ? AE_ERROR : AE_OK);
 692 }
 693
 694 /* TODO: Change code to take advantage of driver model more */
 695 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 696                                     acpi_handle chandle,        /* current node */
 697                                     struct acpi_pci_id **id,
 698                                     int *is_bridge, u8 * bus_number)
 699 {
 700         acpi_handle handle;
 701         struct acpi_pci_id *pci_id = *id;
 702         acpi_status status;
 703         unsigned long temp;
 704         acpi_object_type type;
 705         u8 tu8;
 706
 707         acpi_get_parent(chandle, &handle);
 708         if (handle != rhandle) {
 709                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 710                                         bus_number);
 711
 712                 status = acpi_get_type(handle, &type);
 713                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 714                         return;
 715
 716                 status =
 717                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 718                                           &temp);
 719                 if (ACPI_SUCCESS(status)) {
 720                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 721                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 722
 723                         if (*is_bridge)
 724                                 pci_id->bus = *bus_number;
 725
 726                         /* any nicer way to get bus number of bridge ? */
 727                         status =
 728                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 729                                                            8);
 730                         if (ACPI_SUCCESS(status)
 731                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 732                                 status =
 733                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 734                                                                    &tu8, 8);
 735                                 if (!ACPI_SUCCESS(status)) {
 736                                         /* Certainly broken...  FIX ME */
 737                                         return;
 738                                 }
 739                                 *is_bridge = 1;
 740                                 pci_id->bus = tu8;
 741                                 status =
 742                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 743                                                                    &tu8, 8);
 744                                 if (ACPI_SUCCESS(status)) {
 745                                         *bus_number = tu8;
 746                                 }
 747                         } else
 748                                 *is_bridge = 0;
 749                 }
 750         }
 751 }
 752
 753 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 754                            acpi_handle chandle, /* current node */
 755                            struct acpi_pci_id **id)
 756 {
 757         int is_bridge = 1;
 758         u8 bus_number = (*id)->bus;
 759
 760         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 761 }
 762
 763 static void acpi_os_execute_deferred(struct work_struct *work)
 764 {
 765         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 766         if (!dpc) {
 767                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 768                 return;
 769         }
 770
 771         dpc->function(dpc->context);
 772         kfree(dpc);
 773
 774         return;
 775 }
 776
 777 /*******************************************************************************
 778  *
 779  * FUNCTION:    acpi_os_execute
 780  *
 781  * PARAMETERS:  Type               - Type of the callback
 782  *              Function           - Function to be executed
 783  *              Context            - Function parameters
 784  *
 785  * RETURN:      Status
 786  *
 787  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 788  *              immediately executes function on a separate thread.
 789  *
 790  ******************************************************************************/
 791
 792 acpi_status acpi_os_execute(acpi_execute_type type,
 793                             acpi_osd_exec_callback function, void *context)
 794 {
 795         acpi_status status = AE_OK;
 796         struct acpi_os_dpc *dpc;
 797         struct workqueue_struct *queue;
 798         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 799                           "Scheduling function [%p(%p)] for deferred execution.\n",
 800                           function, context));
 801
 802         if (!function)
 803                 return AE_BAD_PARAMETER;
 804
 805         /*
 806          * Allocate/initialize DPC structure.  Note that this memory will be
 807          * freed by the callee.  The kernel handles the work_struct list  in a
 808          * way that allows us to also free its memory inside the callee.
 809          * Because we may want to schedule several tasks with different
 810          * parameters we can't use the approach some kernel code uses of
 811          * having a static work_struct.
 812          */
 813
 814         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 815         if (!dpc)
 816                 return_ACPI_STATUS(AE_NO_MEMORY);
 817
 818         dpc->function = function;
 819         dpc->context = context;
 820
 821         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 822         queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
 823         if (!queue_work(queue, &dpc->work)) {
 824                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 825                           "Call to queue_work() failed.\n"));
 826                 status = AE_ERROR;
 827                 kfree(dpc);
 828         }
 829         return_ACPI_STATUS(status);
 830 }
 831
 832 EXPORT_SYMBOL(acpi_os_execute);
 833
 834 void acpi_os_wait_events_complete(void *context)
 835 {
 836         flush_workqueue(kacpid_wq);
 837 }
 838
 839 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 840
 841 /*
 842  * Allocate the memory for a spinlock and initialize it.
 843  */
 844 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 845 {
 846         spin_lock_init(*handle);
 847
 848         return AE_OK;
 849 }
 850
 851 /*
 852  * Deallocate the memory for a spinlock.
 853  */
 854 void acpi_os_delete_lock(acpi_spinlock handle)
 855 {
 856         return;
 857 }
 858
 859 acpi_status
 860 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 861 {
 862         struct semaphore *sem = NULL;
 863
 864
 865         sem = acpi_os_allocate(sizeof(struct semaphore));
 866         if (!sem)
 867                 return AE_NO_MEMORY;
 868         memset(sem, 0, sizeof(struct semaphore));
 869
 870         sema_init(sem, initial_units);
 871
 872         *handle = (acpi_handle *) sem;
 873
 874         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 875                           *handle, initial_units));
 876
 877         return AE_OK;
 878 }
 879
 880 /*
 881  * TODO: A better way to delete semaphores?  Linux doesn't have a
 882  * 'delete_semaphore()' function -- may result in an invalid
 883  * pointer dereference for non-synchronized consumers.  Should
 884  * we at least check for blocked threads and signal/cancel them?
 885  */
 886
 887 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 888 {
 889         struct semaphore *sem = (struct semaphore *)handle;
 890
 891
 892         if (!sem)
 893                 return AE_BAD_PARAMETER;
 894
 895         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 896
 897         kfree(sem);
 898         sem = NULL;
 899
 900         return AE_OK;
 901 }
 902
 903 /*
 904  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 905  * improvise.  The process is to sleep for one scheduler quantum
 906  * until the semaphore becomes available.  Downside is that this
 907  * may result in starvation for timeout-based waits when there's
 908  * lots of semaphore activity.
 909  *
 910  * TODO: Support for units > 1?
 911  */
 912 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 913 {
 914         acpi_status status = AE_OK;
 915         struct semaphore *sem = (struct semaphore *)handle;
 916         int ret = 0;
 917
 918
 919         if (!sem || (units < 1))
 920                 return AE_BAD_PARAMETER;
 921
 922         if (units > 1)
 923                 return AE_SUPPORT;
 924
 925         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 926                           handle, units, timeout));
 927
 928         /*
 929          * This can be called during resume with interrupts off.
 930          * Like boot-time, we should be single threaded and will
 931          * always get the lock if we try -- timeout or not.
 932          * If this doesn't succeed, then we will oops courtesy of
 933          * might_sleep() in down().
 934          */
 935         if (!down_trylock(sem))
 936                 return AE_OK;
 937
 938         switch (timeout) {
 939                 /*
 940                  * No Wait:
 941                  * --------
 942                  * A zero timeout value indicates that we shouldn't wait - just
 943                  * acquire the semaphore if available otherwise return AE_TIME
 944                  * (a.k.a. 'would block').
 945                  */
 946         case 0:
 947                 if (down_trylock(sem))
 948                         status = AE_TIME;
 949                 break;
 950
 951                 /*
 952                  * Wait Indefinitely:
 953                  * ------------------
 954                  */
 955         case ACPI_WAIT_FOREVER:
 956                 down(sem);
 957                 break;
 958
 959                 /*
 960                  * Wait w/ Timeout:
 961                  * ----------------
 962                  */
 963         default:
 964                 // TODO: A better timeout algorithm?
 965                 {
 966                         int i = 0;
 967                         static const int quantum_ms = 1000 / HZ;
 968
 969                         ret = down_trylock(sem);
 970                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 971                                 schedule_timeout_interruptible(1);
 972                                 ret = down_trylock(sem);
 973                         }
 974
 975                         if (ret != 0)
 976                                 status = AE_TIME;
 977                 }
 978                 break;
 979         }
 980
 981         if (ACPI_FAILURE(status)) {
 982                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 983                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 984                                   handle, units, timeout,
 985                                   acpi_format_exception(status)));
 986         } else {
 987                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 988                                   "Acquired semaphore[%p|%d|%d]", handle,
 989                                   units, timeout));
 990         }
 991
 992         return status;
 993 }
 994
 995 /*
 996  * TODO: Support for units > 1?
 997  */
 998 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 999 {
1000         struct semaphore *sem = (struct semaphore *)handle;
1001
1002
1003         if (!sem || (units < 1))
1004                 return AE_BAD_PARAMETER;
1005
1006         if (units > 1)
1007                 return AE_SUPPORT;
1008
1009         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
1010                           units));
1011
1012         up(sem);
1013
1014         return AE_OK;
1015 }
1016
1017 #ifdef ACPI_FUTURE_USAGE
1018 u32 acpi_os_get_line(char *buffer)
1019 {
1020
1021 #ifdef ENABLE_DEBUGGER
1022         if (acpi_in_debugger) {
1023                 u32 chars;
1024
1025                 kdb_read(buffer, sizeof(line_buf));
1026
1027                 /* remove the CR kdb includes */
1028                 chars = strlen(buffer) - 1;
1029                 buffer[chars] = '\0';
1030         }
1031 #endif
1032
1033         return 0;
1034 }
1035 #endif                          /*  ACPI_FUTURE_USAGE  */
1036
1037 acpi_status acpi_os_signal(u32 function, void *info)
1038 {
1039         switch (function) {
1040         case ACPI_SIGNAL_FATAL:
1041                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1042                 break;
1043         case ACPI_SIGNAL_BREAKPOINT:
1044                 /*
1045                  * AML Breakpoint
1046                  * ACPI spec. says to treat it as a NOP unless
1047                  * you are debugging.  So if/when we integrate
1048                  * AML debugger into the kernel debugger its
1049                  * hook will go here.  But until then it is
1050                  * not useful to print anything on breakpoints.
1051                  */
1052                 break;
1053         default:
1054                 break;
1055         }
1056
1057         return AE_OK;
1058 }
1059
1060 static int __init acpi_os_name_setup(char *str)
1061 {
1062         char *p = acpi_os_name;
1063         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1064
1065         if (!str || !*str)
1066                 return 0;
1067
1068         for (; count-- && str && *str; str++) {
1069                 if (isalnum(*str) || *str == ' ' || *str == ':')
1070                         *p++ = *str;
1071                 else if (*str == '\'' || *str == '"')
1072                         continue;
1073                 else
1074                         break;
1075         }
1076         *p = 0;
1077
1078         return 1;
1079
1080 }
1081
1082 __setup("acpi_os_name=", acpi_os_name_setup);
1083
1084 static void __init set_osi_linux(unsigned int enable)
1085 {
1086         if (osi_linux.enable != enable) {
1087                 osi_linux.enable = enable;
1088                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1089                         enable ? "Add": "Delet");
1090         }
1091         return;
1092 }
1093
1094 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1095 {
1096         osi_linux.cmdline = 1;  /* cmdline set the default */
1097         set_osi_linux(enable);
1098
1099         return;
1100 }
1101
1102 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1103 {
1104         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1105
1106         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1107
1108         if (enable == -1)
1109                 return;
1110
1111         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1112
1113         set_osi_linux(enable);
1114
1115         return;
1116 }
1117
1118 /*
1119  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1120  *
1121  * empty string disables _OSI
1122  * string starting with '!' disables that string
1123  * otherwise string is added to list, augmenting built-in strings
1124  */
1125 static int __init acpi_osi_setup(char *str)
1126 {
1127         if (str == NULL || *str == '\0') {
1128                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1129                 acpi_gbl_create_osi_method = FALSE;
1130         } else if (!strcmp("!Linux", str)) {
1131                 acpi_cmdline_osi_linux(0);      /* !enable */
1132         } else if (*str == '!') {
1133                 if (acpi_osi_invalidate(++str) == AE_OK)
1134                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1135         } else if (!strcmp("Linux", str)) {
1136                 acpi_cmdline_osi_linux(1);      /* enable */
1137         } else if (*osi_additional_string == '\0') {
1138                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1139                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1140         }
1141
1142         return 1;
1143 }
1144
1145 __setup("acpi_osi=", acpi_osi_setup);
1146
1147 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1148 static int __init acpi_serialize_setup(char *str)
1149 {
1150         printk(KERN_INFO PREFIX "serialize enabled\n");
1151
1152         acpi_gbl_all_methods_serialized = TRUE;
1153
1154         return 1;
1155 }
1156
1157 __setup("acpi_serialize", acpi_serialize_setup);
1158
1159 /*
1160  * Wake and Run-Time GPES are expected to be separate.
1161  * We disable wake-GPEs at run-time to prevent spurious
1162  * interrupts.
1163  *
1164  * However, if a system exists that shares Wake and
1165  * Run-time events on the same GPE this flag is available
1166  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1167  */
1168 static int __init acpi_wake_gpes_always_on_setup(char *str)
1169 {
1170         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1171
1172         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1173
1174         return 1;
1175 }
1176
1177 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1178
1179 /* Check of resource interference between native drivers and ACPI
1180  * OperationRegions (SystemIO and System Memory only).
1181  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1182  * in arbitrary AML code and can interfere with legacy drivers.
1183  * acpi_enforce_resources= can be set to:
1184  *
1185  *   - strict           (2)
1186  *     -> further driver trying to access the resources will not load
1187  *   - lax (default)    (1)
1188  *     -> further driver trying to access the resources will load, but you
1189  *     get a system message that something might go wrong...
1190  *
1191  *   - no               (0)
1192  *     -> ACPI Operation Region resources will not be registered
1193  *
1194  */
1195 #define ENFORCE_RESOURCES_STRICT 2
1196 #define ENFORCE_RESOURCES_LAX    1
1197 #define ENFORCE_RESOURCES_NO     0
1198
1199 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1200
1201 static int __init acpi_enforce_resources_setup(char *str)
1202 {
1203         if (str == NULL || *str == '\0')
1204                 return 0;
1205
1206         if (!strcmp("strict", str))
1207                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1208         else if (!strcmp("lax", str))
1209                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1210         else if (!strcmp("no", str))
1211                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1212
1213         return 1;
1214 }
1215
1216 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1217
1218 /* Check for resource conflicts between ACPI OperationRegions and native
1219  * drivers */
1220 int acpi_check_resource_conflict(struct resource *res)
1221 {
1222         struct acpi_res_list *res_list_elem;
1223         int ioport;
1224         int clash = 0;
1225
1226         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1227                 return 0;
1228         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1229                 return 0;
1230
1231         ioport = res->flags & IORESOURCE_IO;
1232
1233         spin_lock(&acpi_res_lock);
1234         list_for_each_entry(res_list_elem, &resource_list_head,
1235                             resource_list) {
1236                 if (ioport && (res_list_elem->resource_type
1237                                != ACPI_ADR_SPACE_SYSTEM_IO))
1238                         continue;
1239                 if (!ioport && (res_list_elem->resource_type
1240                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1241                         continue;
1242
1243                 if (res->end < res_list_elem->start
1244                     || res_list_elem->end < res->start)
1245                         continue;
1246                 clash = 1;
1247                 break;
1248         }
1249         spin_unlock(&acpi_res_lock);
1250
1251         if (clash) {
1252                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1253                         printk(KERN_INFO "%sACPI: %s resource %s [0x%llx-0x%llx]"
1254                                " conflicts with ACPI region %s"
1255                                " [0x%llx-0x%llx]\n",
1256                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1257                                ? KERN_WARNING : KERN_ERR,
1258                                ioport ? "I/O" : "Memory", res->name,
1259                                (long long) res->start, (long long) res->end,
1260                                res_list_elem->name,
1261                                (long long) res_list_elem->start,
1262                                (long long) res_list_elem->end);
1263                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1264                 }
1265                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1266                         return -EBUSY;
1267         }
1268         return 0;
1269 }
1270 EXPORT_SYMBOL(acpi_check_resource_conflict);
1271
1272 int acpi_check_region(resource_size_t start, resource_size_t n,
1273                       const char *name)
1274 {
1275         struct resource res = {
1276                 .start = start,
1277                 .end   = start + n - 1,
1278                 .name  = name,
1279                 .flags = IORESOURCE_IO,
1280         };
1281
1282         return acpi_check_resource_conflict(&res);
1283 }
1284 EXPORT_SYMBOL(acpi_check_region);
1285
1286 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1287                       const char *name)
1288 {
1289         struct resource res = {
1290                 .start = start,
1291                 .end   = start + n - 1,
1292                 .name  = name,
1293                 .flags = IORESOURCE_MEM,
1294         };
1295
1296         return acpi_check_resource_conflict(&res);
1297
1298 }
1299 EXPORT_SYMBOL(acpi_check_mem_region);
1300
1301 /*
1302  * Acquire a spinlock.
1303  *
1304  * handle is a pointer to the spinlock_t.
1305  */
1306
1307 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1308 {
1309         acpi_cpu_flags flags;
1310         spin_lock_irqsave(lockp, flags);
1311         return flags;
1312 }
1313
1314 /*
1315  * Release a spinlock. See above.
1316  */
1317
1318 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1319 {
1320         spin_unlock_irqrestore(lockp, flags);
1321 }
1322
1323 #ifndef ACPI_USE_LOCAL_CACHE
1324
1325 /*******************************************************************************
1326  *
1327  * FUNCTION:    acpi_os_create_cache
1328  *
1329  * PARAMETERS:  name      - Ascii name for the cache
1330  *              size      - Size of each cached object
1331  *              depth     - Maximum depth of the cache (in objects) <ignored>
1332  *              cache     - Where the new cache object is returned
1333  *
1334  * RETURN:      status
1335  *
1336  * DESCRIPTION: Create a cache object
1337  *
1338  ******************************************************************************/
1339
1340 acpi_status
1341 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1342 {
1343         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1344         if (*cache == NULL)
1345                 return AE_ERROR;
1346         else
1347                 return AE_OK;
1348 }
1349
1350 /*******************************************************************************
1351  *
1352  * FUNCTION:    acpi_os_purge_cache
1353  *
1354  * PARAMETERS:  Cache           - Handle to cache object
1355  *
1356  * RETURN:      Status
1357  *
1358  * DESCRIPTION: Free all objects within the requested cache.
1359  *
1360  ******************************************************************************/
1361
1362 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1363 {
1364         kmem_cache_shrink(cache);
1365         return (AE_OK);
1366 }
1367
1368 /*******************************************************************************
1369  *
1370  * FUNCTION:    acpi_os_delete_cache
1371  *
1372  * PARAMETERS:  Cache           - Handle to cache object
1373  *
1374  * RETURN:      Status
1375  *
1376  * DESCRIPTION: Free all objects within the requested cache and delete the
1377  *              cache object.
1378  *
1379  ******************************************************************************/
1380
1381 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1382 {
1383         kmem_cache_destroy(cache);
1384         return (AE_OK);
1385 }
1386
1387 /*******************************************************************************
1388  *
1389  * FUNCTION:    acpi_os_release_object
1390  *
1391  * PARAMETERS:  Cache       - Handle to cache object
1392  *              Object      - The object to be released
1393  *
1394  * RETURN:      None
1395  *
1396  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1397  *              the object is deleted.
1398  *
1399  ******************************************************************************/
1400
1401 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1402 {
1403         kmem_cache_free(cache, object);
1404         return (AE_OK);
1405 }
1406
1407 /**
1408  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1409  *
1410  *      Returns 0 on success
1411  */
1412 static int acpi_dmi_dump(void)
1413 {
1414
1415         if (!dmi_available)
1416                 return -1;
1417
1418         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1419                 dmi_get_system_info(DMI_SYS_VENDOR));
1420         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1421                 dmi_get_system_info(DMI_PRODUCT_NAME));
1422         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1423                 dmi_get_system_info(DMI_PRODUCT_VERSION));
1424         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1425                 dmi_get_system_info(DMI_BOARD_NAME));
1426         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1427                 dmi_get_system_info(DMI_BIOS_VENDOR));
1428         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1429                 dmi_get_system_info(DMI_BIOS_DATE));
1430
1431         return 0;
1432 }
1433
1434
1435 /******************************************************************************
1436  *
1437  * FUNCTION:    acpi_os_validate_interface
1438  *
1439  * PARAMETERS:  interface           - Requested interface to be validated
1440  *
1441  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1442  *
1443  * DESCRIPTION: Match an interface string to the interfaces supported by the
1444  *              host. Strings originate from an AML call to the _OSI method.
1445  *
1446  *****************************************************************************/
1447
1448 acpi_status
1449 acpi_os_validate_interface (char *interface)
1450 {
1451         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1452                 return AE_OK;
1453         if (!strcmp("Linux", interface)) {
1454
1455                 printk(KERN_NOTICE PREFIX
1456                         "BIOS _OSI(Linux) query %s%s\n",
1457                         osi_linux.enable ? "honored" : "ignored",
1458                         osi_linux.cmdline ? " via cmdline" :
1459                         osi_linux.dmi ? " via DMI" : "");
1460
1461                 if (!osi_linux.dmi) {
1462                         if (acpi_dmi_dump())
1463                                 printk(KERN_NOTICE PREFIX
1464                                         "[please extract dmidecode output]\n");
1465                         printk(KERN_NOTICE PREFIX
1466                                 "Please send DMI info above to "
1467                                 "linux-acpi@vger.kernel.org\n");
1468                 }
1469                 if (!osi_linux.known && !osi_linux.cmdline) {
1470                         printk(KERN_NOTICE PREFIX
1471                                 "If \"acpi_osi=%sLinux\" works better, "
1472                                 "please notify linux-acpi@vger.kernel.org\n",
1473                                 osi_linux.enable ? "!" : "");
1474                 }
1475
1476                 if (osi_linux.enable)
1477                         return AE_OK;
1478         }
1479         return AE_SUPPORT;
1480 }
1481
1482 /******************************************************************************
1483  *
1484  * FUNCTION:    acpi_os_validate_address
1485  *
1486  * PARAMETERS:  space_id             - ACPI space ID
1487  *              address             - Physical address
1488  *              length              - Address length
1489  *
1490  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1491  *              should return AE_AML_ILLEGAL_ADDRESS.
1492  *
1493  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1494  *              the addresses accessed by AML operation regions.
1495  *
1496  *****************************************************************************/
1497
1498 acpi_status
1499 acpi_os_validate_address (
1500     u8                   space_id,
1501     acpi_physical_address   address,
1502     acpi_size               length,
1503     char *name)
1504 {
1505         struct acpi_res_list *res;
1506         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1507                 return AE_OK;
1508
1509         switch (space_id) {
1510         case ACPI_ADR_SPACE_SYSTEM_IO:
1511         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1512                 /* Only interference checks against SystemIO and SytemMemory
1513                    are needed */
1514                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1515                 if (!res)
1516                         return AE_OK;
1517                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1518                 strlcpy(res->name, name, 5);
1519                 res->start = address;
1520                 res->end = address + length - 1;
1521                 res->resource_type = space_id;
1522                 spin_lock(&acpi_res_lock);
1523                 list_add(&res->resource_list, &resource_list_head);
1524                 spin_unlock(&acpi_res_lock);
1525                 pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
1526                          "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1527                          ? "SystemIO" : "System Memory",
1528                          (unsigned long long)res->start,
1529                          (unsigned long long)res->end,
1530                          res->name);
1531                 break;
1532         case ACPI_ADR_SPACE_PCI_CONFIG:
1533         case ACPI_ADR_SPACE_EC:
1534         case ACPI_ADR_SPACE_SMBUS:
1535         case ACPI_ADR_SPACE_CMOS:
1536         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1537         case ACPI_ADR_SPACE_DATA_TABLE:
1538         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1539                 break;
1540         }
1541         return AE_OK;
1542 }
1543
1544 #endif