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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
  48 #define _COMPONENT              ACPI_OS_SERVICES
  49 ACPI_MODULE_NAME("osl");
  50 #define PREFIX          "ACPI: "
  51 struct acpi_os_dpc {
  52         acpi_osd_exec_callback function;
  53         void *context;
  54         struct work_struct work;
  55 };
  56
  57 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  58 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  59 #endif
  60
  61 #ifdef ENABLE_DEBUGGER
  62 #include <linux/kdb.h>
  63
  64 /* stuff for debugger support */
  65 int acpi_in_debugger;
  66 EXPORT_SYMBOL(acpi_in_debugger);
  67
  68 extern char line_buf[80];
  69 #endif                          /*ENABLE_DEBUGGER */
  70
  71 static unsigned int acpi_irq_irq;
  72 static acpi_osd_handler acpi_irq_handler;
  73 static void *acpi_irq_context;
  74 static struct workqueue_struct *kacpid_wq;
  75 static struct workqueue_struct *kacpi_notify_wq;
  76
  77 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  78 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
  79
  80 /*
  81  * "Ode to _OSI(Linux)"
  82  *
  83  * osi_linux -- Control response to BIOS _OSI(Linux) query.
  84  *
  85  * As Linux evolves, the features that it supports change.
  86  * So an OSI string such as "Linux" is not specific enough
  87  * to be useful across multiple versions of Linux.  It
  88  * doesn't identify any particular feature, interface,
  89  * or even any particular version of Linux...
  90  *
  91  * Unfortunately, Linux-2.6.22 and earlier responded "yes"
  92  * to a BIOS _OSI(Linux) query.  When
  93  * a reference mobile BIOS started using it, its use
  94  * started to spread to many vendor platforms.
  95  * As it is not supportable, we need to halt that spread.
  96  *
  97  * Today, most BIOS references to _OSI(Linux) are noise --
  98  * they have no functional effect and are just dead code
  99  * carried over from the reference BIOS.
 100  *
 101  * The next most common case is that _OSI(Linux) harms Linux,
 102  * usually by causing the BIOS to follow paths that are
 103  * not tested during Windows validation.
 104  *
 105  * Finally, there is a short list of platforms
 106  * where OSI(Linux) benefits Linux.
 107  *
 108  * In Linux-2.6.23, OSI(Linux) is first disabled by default.
 109  * DMI is used to disable the dmesg warning about OSI(Linux)
 110  * on platforms where it is known to have no effect.
 111  * But a dmesg warning remains for systems where
 112  * we do not know if OSI(Linux) is good or bad for the system.
 113  * DMI is also used to enable OSI(Linux) for the machines
 114  * that are known to need it.
 115  *
 116  * BIOS writers should NOT query _OSI(Linux) on future systems.
 117  * It will be ignored by default, and to get Linux to
 118  * not ignore it will require a kernel source update to
 119  * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
 120  */
 121 #define OSI_LINUX_ENABLE 0
 122
 123 struct osi_linux {
 124         unsigned int    enable:1;
 125         unsigned int    dmi:1;
 126         unsigned int    cmdline:1;
 127         unsigned int    known:1;
 128 } osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
 129
 130 static void __init acpi_request_region (struct acpi_generic_address *addr,
 131         unsigned int length, char *desc)
 132 {
 133         struct resource *res;
 134
 135         if (!addr->address || !length)
 136                 return;
 137
 138         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 139                 res = request_region(addr->address, length, desc);
 140         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 141                 res = request_mem_region(addr->address, length, desc);
 142 }
 143
 144 static int __init acpi_reserve_resources(void)
 145 {
 146         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 147                 "ACPI PM1a_EVT_BLK");
 148
 149         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 150                 "ACPI PM1b_EVT_BLK");
 151
 152         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 153                 "ACPI PM1a_CNT_BLK");
 154
 155         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 156                 "ACPI PM1b_CNT_BLK");
 157
 158         if (acpi_gbl_FADT.pm_timer_length == 4)
 159                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 160
 161         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 162                 "ACPI PM2_CNT_BLK");
 163
 164         /* Length of GPE blocks must be a non-negative multiple of 2 */
 165
 166         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 167                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 168                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 169
 170         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 171                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 172                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 173
 174         return 0;
 175 }
 176 device_initcall(acpi_reserve_resources);
 177
 178 acpi_status __init acpi_os_initialize(void)
 179 {
 180         return AE_OK;
 181 }
 182
 183 acpi_status acpi_os_initialize1(void)
 184 {
 185         /*
 186          * Initialize PCI configuration space access, as we'll need to access
 187          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
 188          */
 189         if (!raw_pci_ops) {
 190                 printk(KERN_ERR PREFIX
 191                        "Access to PCI configuration space unavailable\n");
 192                 return AE_NULL_ENTRY;
 193         }
 194         kacpid_wq = create_singlethread_workqueue("kacpid");
 195         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 196         BUG_ON(!kacpid_wq);
 197         BUG_ON(!kacpi_notify_wq);
 198         return AE_OK;
 199 }
 200
 201 acpi_status acpi_os_terminate(void)
 202 {
 203         if (acpi_irq_handler) {
 204                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 205                                                  acpi_irq_handler);
 206         }
 207
 208         destroy_workqueue(kacpid_wq);
 209         destroy_workqueue(kacpi_notify_wq);
 210
 211         return AE_OK;
 212 }
 213
 214 void acpi_os_printf(const char *fmt, ...)
 215 {
 216         va_list args;
 217         va_start(args, fmt);
 218         acpi_os_vprintf(fmt, args);
 219         va_end(args);
 220 }
 221
 222 EXPORT_SYMBOL(acpi_os_printf);
 223
 224 void acpi_os_vprintf(const char *fmt, va_list args)
 225 {
 226         static char buffer[512];
 227
 228         vsprintf(buffer, fmt, args);
 229
 230 #ifdef ENABLE_DEBUGGER
 231         if (acpi_in_debugger) {
 232                 kdb_printf("%s", buffer);
 233         } else {
 234                 printk("%s", buffer);
 235         }
 236 #else
 237         printk("%s", buffer);
 238 #endif
 239 }
 240
 241 acpi_physical_address __init acpi_os_get_root_pointer(void)
 242 {
 243         if (efi_enabled) {
 244                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 245                         return efi.acpi20;
 246                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 247                         return efi.acpi;
 248                 else {
 249                         printk(KERN_ERR PREFIX
 250                                "System description tables not found\n");
 251                         return 0;
 252                 }
 253         } else
 254                 return acpi_find_rsdp();
 255 }
 256
 257 void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 258 {
 259         if (phys > ULONG_MAX) {
 260                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 261                 return NULL;
 262         }
 263         if (acpi_gbl_permanent_mmap)
 264                 /*
 265                 * ioremap checks to ensure this is in reserved space
 266                 */
 267                 return ioremap((unsigned long)phys, size);
 268         else
 269                 return __acpi_map_table((unsigned long)phys, size);
 270 }
 271 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 272
 273 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 274 {
 275         if (acpi_gbl_permanent_mmap) {
 276                 iounmap(virt);
 277         }
 278 }
 279 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 280
 281 #ifdef ACPI_FUTURE_USAGE
 282 acpi_status
 283 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 284 {
 285         if (!phys || !virt)
 286                 return AE_BAD_PARAMETER;
 287
 288         *phys = virt_to_phys(virt);
 289
 290         return AE_OK;
 291 }
 292 #endif
 293
 294 #define ACPI_MAX_OVERRIDE_LEN 100
 295
 296 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 297
 298 acpi_status
 299 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 300                             acpi_string * new_val)
 301 {
 302         if (!init_val || !new_val)
 303                 return AE_BAD_PARAMETER;
 304
 305         *new_val = NULL;
 306         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 307                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 308                        acpi_os_name);
 309                 *new_val = acpi_os_name;
 310         }
 311
 312         return AE_OK;
 313 }
 314
 315 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
 316 struct acpi_table_header *acpi_find_dsdt_initrd(void)
 317 {
 318         struct file *firmware_file;
 319         mm_segment_t oldfs;
 320         unsigned long len, len2;
 321         struct acpi_table_header *dsdt_buffer, *ret = NULL;
 322         struct kstat stat;
 323         char *ramfs_dsdt_name = "/DSDT.aml";
 324
 325         printk(KERN_INFO PREFIX "Looking for DSDT in initramfs... ");
 326
 327         /*
 328          * Never do this at home, only the user-space is allowed to open a file.
 329          * The clean way would be to use the firmware loader. But this code must be run
 330          * before there is any userspace available. So we need a static/init firmware
 331          * infrastructure, which doesn't exist yet...
 332          */
 333         if (vfs_stat(ramfs_dsdt_name, &stat) < 0) {
 334                 printk("not found.\n");
 335                 return ret;
 336         }
 337
 338         len = stat.size;
 339         /* check especially against empty files */
 340         if (len <= 4) {
 341                 printk("error, file is too small: only %lu bytes.\n", len);
 342                 return ret;
 343         }
 344
 345         firmware_file = filp_open(ramfs_dsdt_name, O_RDONLY, 0);
 346         if (IS_ERR(firmware_file)) {
 347                 printk("error, could not open file %s.\n", ramfs_dsdt_name);
 348                 return ret;
 349         }
 350
 351         dsdt_buffer = ACPI_ALLOCATE(len);
 352         if (!dsdt_buffer) {
 353                 printk("error when allocating %lu bytes of memory.\n", len);
 354                 goto err;
 355         }
 356
 357         oldfs = get_fs();
 358         set_fs(KERNEL_DS);
 359         len2 = vfs_read(firmware_file, (char __user *)dsdt_buffer, len, &firmware_file->f_pos);
 360         set_fs(oldfs);
 361         if (len2 < len) {
 362                 printk("error trying to read %lu bytes from %s.\n", len, ramfs_dsdt_name);
 363                 ACPI_FREE(dsdt_buffer);
 364                 goto err;
 365         }
 366
 367         printk("successfully read %lu bytes from %s.\n", len, ramfs_dsdt_name);
 368         ret = dsdt_buffer;
 369 err:
 370         filp_close(firmware_file, NULL);
 371         return ret;
 372 }
 373 #endif
 374
 375 acpi_status
 376 acpi_os_table_override(struct acpi_table_header * existing_table,
 377                        struct acpi_table_header ** new_table)
 378 {
 379         if (!existing_table || !new_table)
 380                 return AE_BAD_PARAMETER;
 381
 382         *new_table = NULL;
 383
 384 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 385         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 386                 *new_table = (struct acpi_table_header *)AmlCode;
 387 #endif
 388 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
 389         if (strncmp(existing_table->signature, "DSDT", 4) == 0) {
 390                 struct acpi_table_header *initrd_table = acpi_find_dsdt_initrd();
 391                 if (initrd_table)
 392                         *new_table = initrd_table;
 393         }
 394 #endif
 395         return AE_OK;
 396 }
 397
 398 static irqreturn_t acpi_irq(int irq, void *dev_id)
 399 {
 400         return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 401 }
 402
 403 acpi_status
 404 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 405                                   void *context)
 406 {
 407         unsigned int irq;
 408
 409         /*
 410          * Ignore the GSI from the core, and use the value in our copy of the
 411          * FADT. It may not be the same if an interrupt source override exists
 412          * for the SCI.
 413          */
 414         gsi = acpi_gbl_FADT.sci_interrupt;
 415         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 416                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 417                        gsi);
 418                 return AE_OK;
 419         }
 420
 421         acpi_irq_handler = handler;
 422         acpi_irq_context = context;
 423         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 424                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 425                 return AE_NOT_ACQUIRED;
 426         }
 427         acpi_irq_irq = irq;
 428
 429         return AE_OK;
 430 }
 431
 432 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 433 {
 434         if (irq) {
 435                 free_irq(irq, acpi_irq);
 436                 acpi_irq_handler = NULL;
 437                 acpi_irq_irq = 0;
 438         }
 439
 440         return AE_OK;
 441 }
 442
 443 /*
 444  * Running in interpreter thread context, safe to sleep
 445  */
 446
 447 void acpi_os_sleep(acpi_integer ms)
 448 {
 449         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 450 }
 451
 452 EXPORT_SYMBOL(acpi_os_sleep);
 453
 454 void acpi_os_stall(u32 us)
 455 {
 456         while (us) {
 457                 u32 delay = 1000;
 458
 459                 if (delay > us)
 460                         delay = us;
 461                 udelay(delay);
 462                 touch_nmi_watchdog();
 463                 us -= delay;
 464         }
 465 }
 466
 467 EXPORT_SYMBOL(acpi_os_stall);
 468
 469 /*
 470  * Support ACPI 3.0 AML Timer operand
 471  * Returns 64-bit free-running, monotonically increasing timer
 472  * with 100ns granularity
 473  */
 474 u64 acpi_os_get_timer(void)
 475 {
 476         static u64 t;
 477
 478 #ifdef  CONFIG_HPET
 479         /* TBD: use HPET if available */
 480 #endif
 481
 482 #ifdef  CONFIG_X86_PM_TIMER
 483         /* TBD: default to PM timer if HPET was not available */
 484 #endif
 485         if (!t)
 486                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 487
 488         return ++t;
 489 }
 490
 491 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 492 {
 493         u32 dummy;
 494
 495         if (!value)
 496                 value = &dummy;
 497
 498         *value = 0;
 499         if (width <= 8) {
 500                 *(u8 *) value = inb(port);
 501         } else if (width <= 16) {
 502                 *(u16 *) value = inw(port);
 503         } else if (width <= 32) {
 504                 *(u32 *) value = inl(port);
 505         } else {
 506                 BUG();
 507         }
 508
 509         return AE_OK;
 510 }
 511
 512 EXPORT_SYMBOL(acpi_os_read_port);
 513
 514 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 515 {
 516         if (width <= 8) {
 517                 outb(value, port);
 518         } else if (width <= 16) {
 519                 outw(value, port);
 520         } else if (width <= 32) {
 521                 outl(value, port);
 522         } else {
 523                 BUG();
 524         }
 525
 526         return AE_OK;
 527 }
 528
 529 EXPORT_SYMBOL(acpi_os_write_port);
 530
 531 acpi_status
 532 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 533 {
 534         u32 dummy;
 535         void __iomem *virt_addr;
 536
 537         virt_addr = ioremap(phys_addr, width);
 538         if (!value)
 539                 value = &dummy;
 540
 541         switch (width) {
 542         case 8:
 543                 *(u8 *) value = readb(virt_addr);
 544                 break;
 545         case 16:
 546                 *(u16 *) value = readw(virt_addr);
 547                 break;
 548         case 32:
 549                 *(u32 *) value = readl(virt_addr);
 550                 break;
 551         default:
 552                 BUG();
 553         }
 554
 555         iounmap(virt_addr);
 556
 557         return AE_OK;
 558 }
 559
 560 acpi_status
 561 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 562 {
 563         void __iomem *virt_addr;
 564
 565         virt_addr = ioremap(phys_addr, width);
 566
 567         switch (width) {
 568         case 8:
 569                 writeb(value, virt_addr);
 570                 break;
 571         case 16:
 572                 writew(value, virt_addr);
 573                 break;
 574         case 32:
 575                 writel(value, virt_addr);
 576                 break;
 577         default:
 578                 BUG();
 579         }
 580
 581         iounmap(virt_addr);
 582
 583         return AE_OK;
 584 }
 585
 586 acpi_status
 587 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 588                                void *value, u32 width)
 589 {
 590         int result, size;
 591
 592         if (!value)
 593                 return AE_BAD_PARAMETER;
 594
 595         switch (width) {
 596         case 8:
 597                 size = 1;
 598                 break;
 599         case 16:
 600                 size = 2;
 601                 break;
 602         case 32:
 603                 size = 4;
 604                 break;
 605         default:
 606                 return AE_ERROR;
 607         }
 608
 609         BUG_ON(!raw_pci_ops);
 610
 611         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 612                                    PCI_DEVFN(pci_id->device, pci_id->function),
 613                                    reg, size, value);
 614
 615         return (result ? AE_ERROR : AE_OK);
 616 }
 617
 618 EXPORT_SYMBOL(acpi_os_read_pci_configuration);
 619
 620 acpi_status
 621 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 622                                 acpi_integer value, u32 width)
 623 {
 624         int result, size;
 625
 626         switch (width) {
 627         case 8:
 628                 size = 1;
 629                 break;
 630         case 16:
 631                 size = 2;
 632                 break;
 633         case 32:
 634                 size = 4;
 635                 break;
 636         default:
 637                 return AE_ERROR;
 638         }
 639
 640         BUG_ON(!raw_pci_ops);
 641
 642         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 643                                     PCI_DEVFN(pci_id->device, pci_id->function),
 644                                     reg, size, value);
 645
 646         return (result ? AE_ERROR : AE_OK);
 647 }
 648
 649 /* TODO: Change code to take advantage of driver model more */
 650 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 651                                     acpi_handle chandle,        /* current node */
 652                                     struct acpi_pci_id **id,
 653                                     int *is_bridge, u8 * bus_number)
 654 {
 655         acpi_handle handle;
 656         struct acpi_pci_id *pci_id = *id;
 657         acpi_status status;
 658         unsigned long temp;
 659         acpi_object_type type;
 660         u8 tu8;
 661
 662         acpi_get_parent(chandle, &handle);
 663         if (handle != rhandle) {
 664                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 665                                         bus_number);
 666
 667                 status = acpi_get_type(handle, &type);
 668                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 669                         return;
 670
 671                 status =
 672                     acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 673                                           &temp);
 674                 if (ACPI_SUCCESS(status)) {
 675                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 676                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 677
 678                         if (*is_bridge)
 679                                 pci_id->bus = *bus_number;
 680
 681                         /* any nicer way to get bus number of bridge ? */
 682                         status =
 683                             acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
 684                                                            8);
 685                         if (ACPI_SUCCESS(status)
 686                             && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 687                                 status =
 688                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 689                                                                    &tu8, 8);
 690                                 if (!ACPI_SUCCESS(status)) {
 691                                         /* Certainly broken...  FIX ME */
 692                                         return;
 693                                 }
 694                                 *is_bridge = 1;
 695                                 pci_id->bus = tu8;
 696                                 status =
 697                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 698                                                                    &tu8, 8);
 699                                 if (ACPI_SUCCESS(status)) {
 700                                         *bus_number = tu8;
 701                                 }
 702                         } else
 703                                 *is_bridge = 0;
 704                 }
 705         }
 706 }
 707
 708 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 709                            acpi_handle chandle, /* current node */
 710                            struct acpi_pci_id **id)
 711 {
 712         int is_bridge = 1;
 713         u8 bus_number = (*id)->bus;
 714
 715         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 716 }
 717
 718 static void acpi_os_execute_deferred(struct work_struct *work)
 719 {
 720         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 721         if (!dpc) {
 722                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 723                 return;
 724         }
 725
 726         dpc->function(dpc->context);
 727         kfree(dpc);
 728
 729         /* Yield cpu to notify thread */
 730         cond_resched();
 731
 732         return;
 733 }
 734
 735 static void acpi_os_execute_notify(struct work_struct *work)
 736 {
 737         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 738
 739         if (!dpc) {
 740                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 741                 return;
 742         }
 743
 744         dpc->function(dpc->context);
 745
 746         kfree(dpc);
 747
 748         return;
 749 }
 750
 751 /*******************************************************************************
 752  *
 753  * FUNCTION:    acpi_os_execute
 754  *
 755  * PARAMETERS:  Type               - Type of the callback
 756  *              Function           - Function to be executed
 757  *              Context            - Function parameters
 758  *
 759  * RETURN:      Status
 760  *
 761  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 762  *              immediately executes function on a separate thread.
 763  *
 764  ******************************************************************************/
 765
 766 acpi_status acpi_os_execute(acpi_execute_type type,
 767                             acpi_osd_exec_callback function, void *context)
 768 {
 769         acpi_status status = AE_OK;
 770         struct acpi_os_dpc *dpc;
 771
 772         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 773                           "Scheduling function [%p(%p)] for deferred execution.\n",
 774                           function, context));
 775
 776         if (!function)
 777                 return AE_BAD_PARAMETER;
 778
 779         /*
 780          * Allocate/initialize DPC structure.  Note that this memory will be
 781          * freed by the callee.  The kernel handles the work_struct list  in a
 782          * way that allows us to also free its memory inside the callee.
 783          * Because we may want to schedule several tasks with different
 784          * parameters we can't use the approach some kernel code uses of
 785          * having a static work_struct.
 786          */
 787
 788         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 789         if (!dpc)
 790                 return_ACPI_STATUS(AE_NO_MEMORY);
 791
 792         dpc->function = function;
 793         dpc->context = context;
 794
 795         if (type == OSL_NOTIFY_HANDLER) {
 796                 INIT_WORK(&dpc->work, acpi_os_execute_notify);
 797                 if (!queue_work(kacpi_notify_wq, &dpc->work)) {
 798                         status = AE_ERROR;
 799                         kfree(dpc);
 800                 }
 801         } else {
 802                 INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 803                 if (!queue_work(kacpid_wq, &dpc->work)) {
 804                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 805                                   "Call to queue_work() failed.\n"));
 806                         status = AE_ERROR;
 807                         kfree(dpc);
 808                 }
 809         }
 810         return_ACPI_STATUS(status);
 811 }
 812
 813 EXPORT_SYMBOL(acpi_os_execute);
 814
 815 void acpi_os_wait_events_complete(void *context)
 816 {
 817         flush_workqueue(kacpid_wq);
 818 }
 819
 820 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 821
 822 /*
 823  * Allocate the memory for a spinlock and initialize it.
 824  */
 825 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 826 {
 827         spin_lock_init(*handle);
 828
 829         return AE_OK;
 830 }
 831
 832 /*
 833  * Deallocate the memory for a spinlock.
 834  */
 835 void acpi_os_delete_lock(acpi_spinlock handle)
 836 {
 837         return;
 838 }
 839
 840 acpi_status
 841 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 842 {
 843         struct semaphore *sem = NULL;
 844
 845
 846         sem = acpi_os_allocate(sizeof(struct semaphore));
 847         if (!sem)
 848                 return AE_NO_MEMORY;
 849         memset(sem, 0, sizeof(struct semaphore));
 850
 851         sema_init(sem, initial_units);
 852
 853         *handle = (acpi_handle *) sem;
 854
 855         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 856                           *handle, initial_units));
 857
 858         return AE_OK;
 859 }
 860
 861 EXPORT_SYMBOL(acpi_os_create_semaphore);
 862
 863 /*
 864  * TODO: A better way to delete semaphores?  Linux doesn't have a
 865  * 'delete_semaphore()' function -- may result in an invalid
 866  * pointer dereference for non-synchronized consumers.  Should
 867  * we at least check for blocked threads and signal/cancel them?
 868  */
 869
 870 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 871 {
 872         struct semaphore *sem = (struct semaphore *)handle;
 873
 874
 875         if (!sem)
 876                 return AE_BAD_PARAMETER;
 877
 878         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 879
 880         kfree(sem);
 881         sem = NULL;
 882
 883         return AE_OK;
 884 }
 885
 886 EXPORT_SYMBOL(acpi_os_delete_semaphore);
 887
 888 /*
 889  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 890  * improvise.  The process is to sleep for one scheduler quantum
 891  * until the semaphore becomes available.  Downside is that this
 892  * may result in starvation for timeout-based waits when there's
 893  * lots of semaphore activity.
 894  *
 895  * TODO: Support for units > 1?
 896  */
 897 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 898 {
 899         acpi_status status = AE_OK;
 900         struct semaphore *sem = (struct semaphore *)handle;
 901         int ret = 0;
 902
 903
 904         if (!sem || (units < 1))
 905                 return AE_BAD_PARAMETER;
 906
 907         if (units > 1)
 908                 return AE_SUPPORT;
 909
 910         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 911                           handle, units, timeout));
 912
 913         /*
 914          * This can be called during resume with interrupts off.
 915          * Like boot-time, we should be single threaded and will
 916          * always get the lock if we try -- timeout or not.
 917          * If this doesn't succeed, then we will oops courtesy of
 918          * might_sleep() in down().
 919          */
 920         if (!down_trylock(sem))
 921                 return AE_OK;
 922
 923         switch (timeout) {
 924                 /*
 925                  * No Wait:
 926                  * --------
 927                  * A zero timeout value indicates that we shouldn't wait - just
 928                  * acquire the semaphore if available otherwise return AE_TIME
 929                  * (a.k.a. 'would block').
 930                  */
 931         case 0:
 932                 if (down_trylock(sem))
 933                         status = AE_TIME;
 934                 break;
 935
 936                 /*
 937                  * Wait Indefinitely:
 938                  * ------------------
 939                  */
 940         case ACPI_WAIT_FOREVER:
 941                 down(sem);
 942                 break;
 943
 944                 /*
 945                  * Wait w/ Timeout:
 946                  * ----------------
 947                  */
 948         default:
 949                 // TODO: A better timeout algorithm?
 950                 {
 951                         int i = 0;
 952                         static const int quantum_ms = 1000 / HZ;
 953
 954                         ret = down_trylock(sem);
 955                         for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 956                                 schedule_timeout_interruptible(1);
 957                                 ret = down_trylock(sem);
 958                         }
 959
 960                         if (ret != 0)
 961                                 status = AE_TIME;
 962                 }
 963                 break;
 964         }
 965
 966         if (ACPI_FAILURE(status)) {
 967                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 968                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 969                                   handle, units, timeout,
 970                                   acpi_format_exception(status)));
 971         } else {
 972                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 973                                   "Acquired semaphore[%p|%d|%d]", handle,
 974                                   units, timeout));
 975         }
 976
 977         return status;
 978 }
 979
 980 EXPORT_SYMBOL(acpi_os_wait_semaphore);
 981
 982 /*
 983  * TODO: Support for units > 1?
 984  */
 985 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 986 {
 987         struct semaphore *sem = (struct semaphore *)handle;
 988
 989
 990         if (!sem || (units < 1))
 991                 return AE_BAD_PARAMETER;
 992
 993         if (units > 1)
 994                 return AE_SUPPORT;
 995
 996         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 997                           units));
 998
 999         up(sem);
1000
1001         return AE_OK;
1002 }
1003
1004 EXPORT_SYMBOL(acpi_os_signal_semaphore);
1005
1006 #ifdef ACPI_FUTURE_USAGE
1007 u32 acpi_os_get_line(char *buffer)
1008 {
1009
1010 #ifdef ENABLE_DEBUGGER
1011         if (acpi_in_debugger) {
1012                 u32 chars;
1013
1014                 kdb_read(buffer, sizeof(line_buf));
1015
1016                 /* remove the CR kdb includes */
1017                 chars = strlen(buffer) - 1;
1018                 buffer[chars] = '\0';
1019         }
1020 #endif
1021
1022         return 0;
1023 }
1024 #endif                          /*  ACPI_FUTURE_USAGE  */
1025
1026 acpi_status acpi_os_signal(u32 function, void *info)
1027 {
1028         switch (function) {
1029         case ACPI_SIGNAL_FATAL:
1030                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1031                 break;
1032         case ACPI_SIGNAL_BREAKPOINT:
1033                 /*
1034                  * AML Breakpoint
1035                  * ACPI spec. says to treat it as a NOP unless
1036                  * you are debugging.  So if/when we integrate
1037                  * AML debugger into the kernel debugger its
1038                  * hook will go here.  But until then it is
1039                  * not useful to print anything on breakpoints.
1040                  */
1041                 break;
1042         default:
1043                 break;
1044         }
1045
1046         return AE_OK;
1047 }
1048
1049 EXPORT_SYMBOL(acpi_os_signal);
1050
1051 static int __init acpi_os_name_setup(char *str)
1052 {
1053         char *p = acpi_os_name;
1054         int count = ACPI_MAX_OVERRIDE_LEN - 1;
1055
1056         if (!str || !*str)
1057                 return 0;
1058
1059         for (; count-- && str && *str; str++) {
1060                 if (isalnum(*str) || *str == ' ' || *str == ':')
1061                         *p++ = *str;
1062                 else if (*str == '\'' || *str == '"')
1063                         continue;
1064                 else
1065                         break;
1066         }
1067         *p = 0;
1068
1069         return 1;
1070
1071 }
1072
1073 __setup("acpi_os_name=", acpi_os_name_setup);
1074
1075 static void __init set_osi_linux(unsigned int enable)
1076 {
1077         if (osi_linux.enable != enable) {
1078                 osi_linux.enable = enable;
1079                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
1080                         enable ? "Add": "Delet");
1081         }
1082         return;
1083 }
1084
1085 static void __init acpi_cmdline_osi_linux(unsigned int enable)
1086 {
1087         osi_linux.cmdline = 1;  /* cmdline set the default */
1088         set_osi_linux(enable);
1089
1090         return;
1091 }
1092
1093 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1094 {
1095         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1096
1097         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1098
1099         if (enable == -1)
1100                 return;
1101
1102         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1103
1104         set_osi_linux(enable);
1105
1106         return;
1107 }
1108
1109 /*
1110  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1111  *
1112  * empty string disables _OSI
1113  * string starting with '!' disables that string
1114  * otherwise string is added to list, augmenting built-in strings
1115  */
1116 static int __init acpi_osi_setup(char *str)
1117 {
1118         if (str == NULL || *str == '\0') {
1119                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1120                 acpi_gbl_create_osi_method = FALSE;
1121         } else if (!strcmp("!Linux", str)) {
1122                 acpi_cmdline_osi_linux(0);      /* !enable */
1123         } else if (*str == '!') {
1124                 if (acpi_osi_invalidate(++str) == AE_OK)
1125                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1126         } else if (!strcmp("Linux", str)) {
1127                 acpi_cmdline_osi_linux(1);      /* enable */
1128         } else if (*osi_additional_string == '\0') {
1129                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1130                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1131         }
1132
1133         return 1;
1134 }
1135
1136 __setup("acpi_osi=", acpi_osi_setup);
1137
1138 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1139 static int __init acpi_serialize_setup(char *str)
1140 {
1141         printk(KERN_INFO PREFIX "serialize enabled\n");
1142
1143         acpi_gbl_all_methods_serialized = TRUE;
1144
1145         return 1;
1146 }
1147
1148 __setup("acpi_serialize", acpi_serialize_setup);
1149
1150 /*
1151  * Wake and Run-Time GPES are expected to be separate.
1152  * We disable wake-GPEs at run-time to prevent spurious
1153  * interrupts.
1154  *
1155  * However, if a system exists that shares Wake and
1156  * Run-time events on the same GPE this flag is available
1157  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1158  */
1159 static int __init acpi_wake_gpes_always_on_setup(char *str)
1160 {
1161         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1162
1163         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1164
1165         return 1;
1166 }
1167
1168 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1169
1170 /*
1171  * Acquire a spinlock.
1172  *
1173  * handle is a pointer to the spinlock_t.
1174  */
1175
1176 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1177 {
1178         acpi_cpu_flags flags;
1179         spin_lock_irqsave(lockp, flags);
1180         return flags;
1181 }
1182
1183 /*
1184  * Release a spinlock. See above.
1185  */
1186
1187 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1188 {
1189         spin_unlock_irqrestore(lockp, flags);
1190 }
1191
1192 #ifndef ACPI_USE_LOCAL_CACHE
1193
1194 /*******************************************************************************
1195  *
1196  * FUNCTION:    acpi_os_create_cache
1197  *
1198  * PARAMETERS:  name      - Ascii name for the cache
1199  *              size      - Size of each cached object
1200  *              depth     - Maximum depth of the cache (in objects) <ignored>
1201  *              cache     - Where the new cache object is returned
1202  *
1203  * RETURN:      status
1204  *
1205  * DESCRIPTION: Create a cache object
1206  *
1207  ******************************************************************************/
1208
1209 acpi_status
1210 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1211 {
1212         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1213         if (*cache == NULL)
1214                 return AE_ERROR;
1215         else
1216                 return AE_OK;
1217 }
1218
1219 /*******************************************************************************
1220  *
1221  * FUNCTION:    acpi_os_purge_cache
1222  *
1223  * PARAMETERS:  Cache           - Handle to cache object
1224  *
1225  * RETURN:      Status
1226  *
1227  * DESCRIPTION: Free all objects within the requested cache.
1228  *
1229  ******************************************************************************/
1230
1231 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1232 {
1233         kmem_cache_shrink(cache);
1234         return (AE_OK);
1235 }
1236
1237 /*******************************************************************************
1238  *
1239  * FUNCTION:    acpi_os_delete_cache
1240  *
1241  * PARAMETERS:  Cache           - Handle to cache object
1242  *
1243  * RETURN:      Status
1244  *
1245  * DESCRIPTION: Free all objects within the requested cache and delete the
1246  *              cache object.
1247  *
1248  ******************************************************************************/
1249
1250 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1251 {
1252         kmem_cache_destroy(cache);
1253         return (AE_OK);
1254 }
1255
1256 /*******************************************************************************
1257  *
1258  * FUNCTION:    acpi_os_release_object
1259  *
1260  * PARAMETERS:  Cache       - Handle to cache object
1261  *              Object      - The object to be released
1262  *
1263  * RETURN:      None
1264  *
1265  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1266  *              the object is deleted.
1267  *
1268  ******************************************************************************/
1269
1270 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1271 {
1272         kmem_cache_free(cache, object);
1273         return (AE_OK);
1274 }
1275
1276 /**
1277  *      acpi_dmi_dump - dump DMI slots needed for blacklist entry
1278  *
1279  *      Returns 0 on success
1280  */
1281 int acpi_dmi_dump(void)
1282 {
1283
1284         if (!dmi_available)
1285                 return -1;
1286
1287         printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
1288                 dmi_get_slot(DMI_SYS_VENDOR));
1289         printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
1290                 dmi_get_slot(DMI_PRODUCT_NAME));
1291         printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
1292                 dmi_get_slot(DMI_PRODUCT_VERSION));
1293         printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
1294                 dmi_get_slot(DMI_BOARD_NAME));
1295         printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
1296                 dmi_get_slot(DMI_BIOS_VENDOR));
1297         printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
1298                 dmi_get_slot(DMI_BIOS_DATE));
1299
1300         return 0;
1301 }
1302
1303
1304 /******************************************************************************
1305  *
1306  * FUNCTION:    acpi_os_validate_interface
1307  *
1308  * PARAMETERS:  interface           - Requested interface to be validated
1309  *
1310  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1311  *
1312  * DESCRIPTION: Match an interface string to the interfaces supported by the
1313  *              host. Strings originate from an AML call to the _OSI method.
1314  *
1315  *****************************************************************************/
1316
1317 acpi_status
1318 acpi_os_validate_interface (char *interface)
1319 {
1320         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1321                 return AE_OK;
1322         if (!strcmp("Linux", interface)) {
1323
1324                 printk(KERN_NOTICE PREFIX
1325                         "BIOS _OSI(Linux) query %s%s\n",
1326                         osi_linux.enable ? "honored" : "ignored",
1327                         osi_linux.cmdline ? " via cmdline" :
1328                         osi_linux.dmi ? " via DMI" : "");
1329
1330                 if (!osi_linux.dmi) {
1331                         if (acpi_dmi_dump())
1332                                 printk(KERN_NOTICE PREFIX
1333                                         "[please extract dmidecode output]\n");
1334                         printk(KERN_NOTICE PREFIX
1335                                 "Please send DMI info above to "
1336                                 "linux-acpi@vger.kernel.org\n");
1337                 }
1338                 if (!osi_linux.known && !osi_linux.cmdline) {
1339                         printk(KERN_NOTICE PREFIX
1340                                 "If \"acpi_osi=%sLinux\" works better, "
1341                                 "please notify linux-acpi@vger.kernel.org\n",
1342                                 osi_linux.enable ? "!" : "");
1343                 }
1344
1345                 if (osi_linux.enable)
1346                         return AE_OK;
1347         }
1348         return AE_SUPPORT;
1349 }
1350
1351 /******************************************************************************
1352  *
1353  * FUNCTION:    acpi_os_validate_address
1354  *
1355  * PARAMETERS:  space_id             - ACPI space ID
1356  *              address             - Physical address
1357  *              length              - Address length
1358  *
1359  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1360  *              should return AE_AML_ILLEGAL_ADDRESS.
1361  *
1362  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1363  *              the addresses accessed by AML operation regions.
1364  *
1365  *****************************************************************************/
1366
1367 acpi_status
1368 acpi_os_validate_address (
1369     u8                   space_id,
1370     acpi_physical_address   address,
1371     acpi_size               length)
1372 {
1373
1374     return AE_OK;
1375 }
1376
1377 #endif