drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  *
  26  */
  27
  28 #include <linux/config.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/mm.h>
  32 #include <linux/pci.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/kmod.h>
  36 #include <linux/delay.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/nmi.h>
  39 #include <acpi/acpi.h>
  40 #include <asm/io.h>
  41 #include <acpi/acpi_bus.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <linux/efi.h>
  45
  46
  47 #define _COMPONENT              ACPI_OS_SERVICES
  48 ACPI_MODULE_NAME        ("osl")
  49
  50 #define PREFIX          "ACPI: "
  51
  52 struct acpi_os_dpc
  53 {
  54     acpi_osd_exec_callback  function;
  55     void                    *context;
  56 };
  57
  58 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  59 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  60 #endif
  61
  62 #ifdef ENABLE_DEBUGGER
  63 #include <linux/kdb.h>
  64 /* stuff for debugger support */
  65 int acpi_in_debugger;
  66 extern char line_buf[80];
  67 #endif /*ENABLE_DEBUGGER*/
  68
  69 static unsigned int acpi_irq_irq;
  70 static acpi_osd_handler acpi_irq_handler;
  71 static void *acpi_irq_context;
  72 static struct workqueue_struct *kacpid_wq;
  73
  74 acpi_status
  75 acpi_os_initialize(void)
  76 {
  77         return AE_OK;
  78 }
  79
  80 acpi_status
  81 acpi_os_initialize1(void)
  82 {
  83         /*
  84          * Initialize PCI configuration space access, as we'll need to access
  85          * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
  86          */
  87 #ifdef CONFIG_ACPI_PCI
  88         if (!raw_pci_ops) {
  89                 printk(KERN_ERR PREFIX "Access to PCI configuration space unavailable\n");
  90                 return AE_NULL_ENTRY;
  91         }
  92 #endif
  93         kacpid_wq = create_singlethread_workqueue("kacpid");
  94         BUG_ON(!kacpid_wq);
  95
  96         return AE_OK;
  97 }
  98
  99 acpi_status
 100 acpi_os_terminate(void)
 101 {
 102         if (acpi_irq_handler) {
 103                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 104                                                  acpi_irq_handler);
 105         }
 106
 107         destroy_workqueue(kacpid_wq);
 108
 109         return AE_OK;
 110 }
 111
 112 void
 113 acpi_os_printf(const char *fmt,...)
 114 {
 115         va_list args;
 116         va_start(args, fmt);
 117         acpi_os_vprintf(fmt, args);
 118         va_end(args);
 119 }
 120
 121 void
 122 acpi_os_vprintf(const char *fmt, va_list args)
 123 {
 124         static char buffer[512];
 125
 126         vsprintf(buffer, fmt, args);
 127
 128 #ifdef ENABLE_DEBUGGER
 129         if (acpi_in_debugger) {
 130                 kdb_printf("%s", buffer);
 131         } else {
 132                 printk("%s", buffer);
 133         }
 134 #else
 135         printk("%s", buffer);
 136 #endif
 137 }
 138
 139 void *
 140 acpi_os_allocate(acpi_size size)
 141 {
 142         return kmalloc(size, GFP_KERNEL);
 143 }
 144
 145 void
 146 acpi_os_free(void *ptr)
 147 {
 148         kfree(ptr);
 149 }
 150
 151 acpi_status
 152 acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
 153 {
 154         if (efi_enabled) {
 155                 addr->pointer_type = ACPI_PHYSICAL_POINTER;
 156                 if (efi.acpi20)
 157                         addr->pointer.physical =
 158                                 (acpi_physical_address) virt_to_phys(efi.acpi20);
 159                 else if (efi.acpi)
 160                         addr->pointer.physical =
 161                                 (acpi_physical_address) virt_to_phys(efi.acpi);
 162                 else {
 163                         printk(KERN_ERR PREFIX "System description tables not found\n");
 164                         return AE_NOT_FOUND;
 165                 }
 166         } else {
 167                 if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
 168                         printk(KERN_ERR PREFIX "System description tables not found\n");
 169                         return AE_NOT_FOUND;
 170                 }
 171         }
 172
 173         return AE_OK;
 174 }
 175
 176 acpi_status
 177 acpi_os_map_memory(acpi_physical_address phys, acpi_size size, void __iomem **virt)
 178 {
 179         if (efi_enabled) {
 180                 if (EFI_MEMORY_WB & efi_mem_attributes(phys)) {
 181                         *virt = (void __iomem *) phys_to_virt(phys);
 182                 } else {
 183                         *virt = ioremap(phys, size);
 184                 }
 185         } else {
 186                 if (phys > ULONG_MAX) {
 187                         printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 188                         return AE_BAD_PARAMETER;
 189                 }
 190                 /*
 191                  * ioremap checks to ensure this is in reserved space
 192                  */
 193                 *virt = ioremap((unsigned long) phys, size);
 194         }
 195
 196         if (!*virt)
 197                 return AE_NO_MEMORY;
 198
 199         return AE_OK;
 200 }
 201
 202 void
 203 acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 204 {
 205         iounmap(virt);
 206 }
 207
 208 acpi_status
 209 acpi_os_get_physical_address(void *virt, acpi_physical_address *phys)
 210 {
 211         if(!phys || !virt)
 212                 return AE_BAD_PARAMETER;
 213
 214         *phys = virt_to_phys(virt);
 215
 216         return AE_OK;
 217 }
 218
 219 #define ACPI_MAX_OVERRIDE_LEN 100
 220
 221 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 222
 223 acpi_status
 224 acpi_os_predefined_override (const struct acpi_predefined_names *init_val,
 225                              acpi_string *new_val)
 226 {
 227         if (!init_val || !new_val)
 228                 return AE_BAD_PARAMETER;
 229
 230         *new_val = NULL;
 231         if (!memcmp (init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 232                 printk(KERN_INFO PREFIX "Overriding _OS definition %s\n",
 233                         acpi_os_name);
 234                 *new_val = acpi_os_name;
 235         }
 236
 237         return AE_OK;
 238 }
 239
 240 acpi_status
 241 acpi_os_table_override (struct acpi_table_header *existing_table,
 242                         struct acpi_table_header **new_table)
 243 {
 244         if (!existing_table || !new_table)
 245                 return AE_BAD_PARAMETER;
 246
 247 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 248         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 249                 *new_table = (struct acpi_table_header*)AmlCode;
 250         else
 251                 *new_table = NULL;
 252 #else
 253         *new_table = NULL;
 254 #endif
 255         return AE_OK;
 256 }
 257
 258 static irqreturn_t
 259 acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
 260 {
 261         return (*acpi_irq_handler)(acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
 262 }
 263
 264 acpi_status
 265 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, void *context)
 266 {
 267         unsigned int irq;
 268
 269         /*
 270          * Ignore the GSI from the core, and use the value in our copy of the
 271          * FADT. It may not be the same if an interrupt source override exists
 272          * for the SCI.
 273          */
 274         gsi = acpi_fadt.sci_int;
 275         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 276                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 277                        gsi);
 278                 return AE_OK;
 279         }
 280
 281         acpi_irq_handler = handler;
 282         acpi_irq_context = context;
 283         if (request_irq(irq, acpi_irq, SA_SHIRQ, "acpi", acpi_irq)) {
 284                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 285                 return AE_NOT_ACQUIRED;
 286         }
 287         acpi_irq_irq = irq;
 288
 289         return AE_OK;
 290 }
 291
 292 acpi_status
 293 acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 294 {
 295         if (irq) {
 296                 free_irq(irq, acpi_irq);
 297                 acpi_irq_handler = NULL;
 298                 acpi_irq_irq = 0;
 299         }
 300
 301         return AE_OK;
 302 }
 303
 304 /*
 305  * Running in interpreter thread context, safe to sleep
 306  */
 307
 308 void
 309 acpi_os_sleep(u32 sec, u32 ms)
 310 {
 311         current->state = TASK_INTERRUPTIBLE;
 312         schedule_timeout(HZ * sec + (ms * HZ) / 1000);
 313 }
 314
 315 void
 316 acpi_os_stall(u32 us)
 317 {
 318         while (us) {
 319                 u32 delay = 1000;
 320
 321                 if (delay > us)
 322                         delay = us;
 323                 udelay(delay);
 324                 touch_nmi_watchdog();
 325                 us -= delay;
 326         }
 327 }
 328
 329 acpi_status
 330 acpi_os_read_port(
 331         acpi_io_address port,
 332         u32             *value,
 333         u32             width)
 334 {
 335         u32 dummy;
 336
 337         if (!value)
 338                 value = &dummy;
 339
 340         switch (width)
 341         {
 342         case 8:
 343                 *(u8*)  value = inb(port);
 344                 break;
 345         case 16:
 346                 *(u16*) value = inw(port);
 347                 break;
 348         case 32:
 349                 *(u32*) value = inl(port);
 350                 break;
 351         default:
 352                 BUG();
 353         }
 354
 355         return AE_OK;
 356 }
 357
 358 acpi_status
 359 acpi_os_write_port(
 360         acpi_io_address port,
 361         u32             value,
 362         u32             width)
 363 {
 364         switch (width)
 365         {
 366         case 8:
 367                 outb(value, port);
 368                 break;
 369         case 16:
 370                 outw(value, port);
 371                 break;
 372         case 32:
 373                 outl(value, port);
 374                 break;
 375         default:
 376                 BUG();
 377         }
 378
 379         return AE_OK;
 380 }
 381
 382 acpi_status
 383 acpi_os_read_memory(
 384         acpi_physical_address   phys_addr,
 385         u32                     *value,
 386         u32                     width)
 387 {
 388         u32                     dummy;
 389         void __iomem            *virt_addr;
 390         int                     iomem = 0;
 391
 392         if (efi_enabled) {
 393                 if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
 394                         /* HACK ALERT! We can use readb/w/l on real memory too.. */
 395                         virt_addr = (void __iomem *) phys_to_virt(phys_addr);
 396                 } else {
 397                         iomem = 1;
 398                         virt_addr = ioremap(phys_addr, width);
 399                 }
 400         } else
 401                 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
 402         if (!value)
 403                 value = &dummy;
 404
 405         switch (width) {
 406         case 8:
 407                 *(u8*) value = readb(virt_addr);
 408                 break;
 409         case 16:
 410                 *(u16*) value = readw(virt_addr);
 411                 break;
 412         case 32:
 413                 *(u32*) value = readl(virt_addr);
 414                 break;
 415         default:
 416                 BUG();
 417         }
 418
 419         if (efi_enabled) {
 420                 if (iomem)
 421                         iounmap(virt_addr);
 422         }
 423
 424         return AE_OK;
 425 }
 426
 427 acpi_status
 428 acpi_os_write_memory(
 429         acpi_physical_address   phys_addr,
 430         u32                     value,
 431         u32                     width)
 432 {
 433         void __iomem            *virt_addr;
 434         int                     iomem = 0;
 435
 436         if (efi_enabled) {
 437                 if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
 438                         /* HACK ALERT! We can use writeb/w/l on real memory too */
 439                         virt_addr = (void __iomem *) phys_to_virt(phys_addr);
 440                 } else {
 441                         iomem = 1;
 442                         virt_addr = ioremap(phys_addr, width);
 443                 }
 444         } else
 445                 virt_addr = (void __iomem *) phys_to_virt(phys_addr);
 446
 447         switch (width) {
 448         case 8:
 449                 writeb(value, virt_addr);
 450                 break;
 451         case 16:
 452                 writew(value, virt_addr);
 453                 break;
 454         case 32:
 455                 writel(value, virt_addr);
 456                 break;
 457         default:
 458                 BUG();
 459         }
 460
 461         if (iomem)
 462                 iounmap(virt_addr);
 463
 464         return AE_OK;
 465 }
 466
 467 #ifdef CONFIG_ACPI_PCI
 468
 469 acpi_status
 470 acpi_os_read_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, void *value, u32 width)
 471 {
 472         int result, size;
 473
 474         if (!value)
 475                 return AE_BAD_PARAMETER;
 476
 477         switch (width) {
 478         case 8:
 479                 size = 1;
 480                 break;
 481         case 16:
 482                 size = 2;
 483                 break;
 484         case 32:
 485                 size = 4;
 486                 break;
 487         default:
 488                 return AE_ERROR;
 489         }
 490
 491         BUG_ON(!raw_pci_ops);
 492
 493         result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
 494                                 PCI_DEVFN(pci_id->device, pci_id->function),
 495                                 reg, size, value);
 496
 497         return (result ? AE_ERROR : AE_OK);
 498 }
 499
 500 acpi_status
 501 acpi_os_write_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, acpi_integer value, u32 width)
 502 {
 503         int result, size;
 504
 505         switch (width) {
 506         case 8:
 507                 size = 1;
 508                 break;
 509         case 16:
 510                 size = 2;
 511                 break;
 512         case 32:
 513                 size = 4;
 514                 break;
 515         default:
 516                 return AE_ERROR;
 517         }
 518
 519         BUG_ON(!raw_pci_ops);
 520
 521         result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
 522                                 PCI_DEVFN(pci_id->device, pci_id->function),
 523                                 reg, size, value);
 524
 525         return (result ? AE_ERROR : AE_OK);
 526 }
 527
 528 /* TODO: Change code to take advantage of driver model more */
 529 void
 530 acpi_os_derive_pci_id_2 (
 531         acpi_handle             rhandle,        /* upper bound  */
 532         acpi_handle             chandle,        /* current node */
 533         struct acpi_pci_id      **id,
 534         int                     *is_bridge,
 535         u8                      *bus_number)
 536 {
 537         acpi_handle             handle;
 538         struct acpi_pci_id      *pci_id = *id;
 539         acpi_status             status;
 540         unsigned long           temp;
 541         acpi_object_type        type;
 542         u8                      tu8;
 543
 544         acpi_get_parent(chandle, &handle);
 545         if (handle != rhandle) {
 546                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge, bus_number);
 547
 548                 status = acpi_get_type(handle, &type);
 549                 if ( (ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE) )
 550                         return;
 551
 552                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &temp);
 553                 if (ACPI_SUCCESS(status)) {
 554                         pci_id->device  = ACPI_HIWORD (ACPI_LODWORD (temp));
 555                         pci_id->function = ACPI_LOWORD (ACPI_LODWORD (temp));
 556
 557                         if (*is_bridge)
 558                                 pci_id->bus = *bus_number;
 559
 560                         /* any nicer way to get bus number of bridge ? */
 561                         status = acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8, 8);
 562                         if (ACPI_SUCCESS(status) &&
 563                             ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
 564                                 status = acpi_os_read_pci_configuration(pci_id, 0x18, &tu8, 8);
 565                                 if (!ACPI_SUCCESS(status)) {
 566                                         /* Certainly broken...  FIX ME */
 567                                         return;
 568                                 }
 569                                 *is_bridge = 1;
 570                                 pci_id->bus = tu8;
 571                                 status = acpi_os_read_pci_configuration(pci_id, 0x19, &tu8, 8);
 572                                 if (ACPI_SUCCESS(status)) {
 573                                         *bus_number = tu8;
 574                                 }
 575                         } else
 576                                 *is_bridge = 0;
 577                 }
 578         }
 579 }
 580
 581 void
 582 acpi_os_derive_pci_id (
 583         acpi_handle             rhandle,        /* upper bound  */
 584         acpi_handle             chandle,        /* current node */
 585         struct acpi_pci_id      **id)
 586 {
 587         int is_bridge = 1;
 588         u8 bus_number = (*id)->bus;
 589
 590         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 591 }
 592
 593 #else /*!CONFIG_ACPI_PCI*/
 594
 595 acpi_status
 596 acpi_os_write_pci_configuration (
 597         struct acpi_pci_id      *pci_id,
 598         u32                     reg,
 599         acpi_integer            value,
 600         u32                     width)
 601 {
 602         return (AE_SUPPORT);
 603 }
 604
 605 acpi_status
 606 acpi_os_read_pci_configuration (
 607         struct acpi_pci_id      *pci_id,
 608         u32                     reg,
 609         void                    *value,
 610         u32                     width)
 611 {
 612         return (AE_SUPPORT);
 613 }
 614
 615 void
 616 acpi_os_derive_pci_id (
 617         acpi_handle             rhandle,        /* upper bound  */
 618         acpi_handle             chandle,        /* current node */
 619         struct acpi_pci_id      **id)
 620 {
 621 }
 622
 623 #endif /*CONFIG_ACPI_PCI*/
 624
 625 static void
 626 acpi_os_execute_deferred (
 627         void *context)
 628 {
 629         struct acpi_os_dpc      *dpc = NULL;
 630
 631         ACPI_FUNCTION_TRACE ("os_execute_deferred");
 632
 633         dpc = (struct acpi_os_dpc *) context;
 634         if (!dpc) {
 635                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 636                 return_VOID;
 637         }
 638
 639         dpc->function(dpc->context);
 640
 641         kfree(dpc);
 642
 643         return_VOID;
 644 }
 645
 646 acpi_status
 647 acpi_os_queue_for_execution(
 648         u32                     priority,
 649         acpi_osd_exec_callback  function,
 650         void                    *context)
 651 {
 652         acpi_status             status = AE_OK;
 653         struct acpi_os_dpc      *dpc;
 654         struct work_struct      *task;
 655
 656         ACPI_FUNCTION_TRACE ("os_queue_for_execution");
 657
 658         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Scheduling function [%p(%p)] for deferred execution.\n", function, context));
 659
 660         if (!function)
 661                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 662
 663         /*
 664          * Allocate/initialize DPC structure.  Note that this memory will be
 665          * freed by the callee.  The kernel handles the tq_struct list  in a
 666          * way that allows us to also free its memory inside the callee.
 667          * Because we may want to schedule several tasks with different
 668          * parameters we can't use the approach some kernel code uses of
 669          * having a static tq_struct.
 670          * We can save time and code by allocating the DPC and tq_structs
 671          * from the same memory.
 672          */
 673
 674         dpc = kmalloc(sizeof(struct acpi_os_dpc)+sizeof(struct work_struct), GFP_ATOMIC);
 675         if (!dpc)
 676                 return_ACPI_STATUS (AE_NO_MEMORY);
 677
 678         dpc->function = function;
 679         dpc->context = context;
 680
 681         task = (void *)(dpc+1);
 682         INIT_WORK(task, acpi_os_execute_deferred, (void*)dpc);
 683
 684         if (!queue_work(kacpid_wq, task)) {
 685                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Call to queue_work() failed.\n"));
 686                 kfree(dpc);
 687                 status = AE_ERROR;
 688         }
 689
 690         return_ACPI_STATUS (status);
 691 }
 692
 693 void
 694 acpi_os_wait_events_complete(
 695         void *context)
 696 {
 697         flush_workqueue(kacpid_wq);
 698 }
 699
 700 /*
 701  * Allocate the memory for a spinlock and initialize it.
 702  */
 703 acpi_status
 704 acpi_os_create_lock (
 705         acpi_handle     *out_handle)
 706 {
 707         spinlock_t *lock_ptr;
 708
 709         ACPI_FUNCTION_TRACE ("os_create_lock");
 710
 711         lock_ptr = acpi_os_allocate(sizeof(spinlock_t));
 712
 713         spin_lock_init(lock_ptr);
 714
 715         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));
 716
 717         *out_handle = lock_ptr;
 718
 719         return_ACPI_STATUS (AE_OK);
 720 }
 721
 722
 723 /*
 724  * Deallocate the memory for a spinlock.
 725  */
 726 void
 727 acpi_os_delete_lock (
 728         acpi_handle     handle)
 729 {
 730         ACPI_FUNCTION_TRACE ("os_create_lock");
 731
 732         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));
 733
 734         acpi_os_free(handle);
 735
 736         return_VOID;
 737 }
 738
 739 /*
 740  * Acquire a spinlock.
 741  *
 742  * handle is a pointer to the spinlock_t.
 743  * flags is *not* the result of save_flags - it is an ACPI-specific flag variable
 744  *   that indicates whether we are at interrupt level.
 745  */
 746 void
 747 acpi_os_acquire_lock (
 748         acpi_handle     handle,
 749         u32             flags)
 750 {
 751         ACPI_FUNCTION_TRACE ("os_acquire_lock");
 752
 753         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquiring spinlock[%p] from %s level\n", handle,
 754                 ((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
 755
 756         if (flags & ACPI_NOT_ISR)
 757                 ACPI_DISABLE_IRQS();
 758
 759         spin_lock((spinlock_t *)handle);
 760
 761         return_VOID;
 762 }
 763
 764
 765 /*
 766  * Release a spinlock. See above.
 767  */
 768 void
 769 acpi_os_release_lock (
 770         acpi_handle     handle,
 771         u32             flags)
 772 {
 773         ACPI_FUNCTION_TRACE ("os_release_lock");
 774
 775         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Releasing spinlock[%p] from %s level\n", handle,
 776                 ((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
 777
 778         spin_unlock((spinlock_t *)handle);
 779
 780         if (flags & ACPI_NOT_ISR)
 781                 ACPI_ENABLE_IRQS();
 782
 783         return_VOID;
 784 }
 785
 786
 787 acpi_status
 788 acpi_os_create_semaphore(
 789         u32             max_units,
 790         u32             initial_units,
 791         acpi_handle     *handle)
 792 {
 793         struct semaphore        *sem = NULL;
 794
 795         ACPI_FUNCTION_TRACE ("os_create_semaphore");
 796
 797         sem = acpi_os_allocate(sizeof(struct semaphore));
 798         if (!sem)
 799                 return_ACPI_STATUS (AE_NO_MEMORY);
 800         memset(sem, 0, sizeof(struct semaphore));
 801
 802         sema_init(sem, initial_units);
 803
 804         *handle = (acpi_handle*)sem;
 805
 806         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", *handle, initial_units));
 807
 808         return_ACPI_STATUS (AE_OK);
 809 }
 810
 811
 812 /*
 813  * TODO: A better way to delete semaphores?  Linux doesn't have a
 814  * 'delete_semaphore()' function -- may result in an invalid
 815  * pointer dereference for non-synchronized consumers.  Should
 816  * we at least check for blocked threads and signal/cancel them?
 817  */
 818
 819 acpi_status
 820 acpi_os_delete_semaphore(
 821         acpi_handle     handle)
 822 {
 823         struct semaphore *sem = (struct semaphore*) handle;
 824
 825         ACPI_FUNCTION_TRACE ("os_delete_semaphore");
 826
 827         if (!sem)
 828                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 829
 830         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 831
 832         acpi_os_free(sem); sem =  NULL;
 833
 834         return_ACPI_STATUS (AE_OK);
 835 }
 836
 837
 838 /*
 839  * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 840  * improvise.  The process is to sleep for one scheduler quantum
 841  * until the semaphore becomes available.  Downside is that this
 842  * may result in starvation for timeout-based waits when there's
 843  * lots of semaphore activity.
 844  *
 845  * TODO: Support for units > 1?
 846  */
 847 acpi_status
 848 acpi_os_wait_semaphore(
 849         acpi_handle             handle,
 850         u32                     units,
 851         u16                     timeout)
 852 {
 853         acpi_status             status = AE_OK;
 854         struct semaphore        *sem = (struct semaphore*)handle;
 855         int                     ret = 0;
 856
 857         ACPI_FUNCTION_TRACE ("os_wait_semaphore");
 858
 859         if (!sem || (units < 1))
 860                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 861
 862         if (units > 1)
 863                 return_ACPI_STATUS (AE_SUPPORT);
 864
 865         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", handle, units, timeout));
 866
 867         if (in_atomic())
 868                 timeout = 0;
 869
 870         switch (timeout)
 871         {
 872                 /*
 873                  * No Wait:
 874                  * --------
 875                  * A zero timeout value indicates that we shouldn't wait - just
 876                  * acquire the semaphore if available otherwise return AE_TIME
 877                  * (a.k.a. 'would block').
 878                  */
 879                 case 0:
 880                 if(down_trylock(sem))
 881                         status = AE_TIME;
 882                 break;
 883
 884                 /*
 885                  * Wait Indefinitely:
 886                  * ------------------
 887                  */
 888                 case ACPI_WAIT_FOREVER:
 889                 down(sem);
 890                 break;
 891
 892                 /*
 893                  * Wait w/ Timeout:
 894                  * ----------------
 895                  */
 896                 default:
 897                 // TODO: A better timeout algorithm?
 898                 {
 899                         int i = 0;
 900                         static const int quantum_ms = 1000/HZ;
 901
 902                         ret = down_trylock(sem);
 903                         for (i = timeout; (i > 0 && ret < 0); i -= quantum_ms) {
 904                                 current->state = TASK_INTERRUPTIBLE;
 905                                 schedule_timeout(1);
 906                                 ret = down_trylock(sem);
 907                         }
 908
 909                         if (ret != 0)
 910                                 status = AE_TIME;
 911                 }
 912                 break;
 913         }
 914
 915         if (ACPI_FAILURE(status)) {
 916                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Failed to acquire semaphore[%p|%d|%d], %s\n",
 917                         handle, units, timeout, acpi_format_exception(status)));
 918         }
 919         else {
 920                 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquired semaphore[%p|%d|%d]\n", handle, units, timeout));
 921         }
 922
 923         return_ACPI_STATUS (status);
 924 }
 925
 926
 927 /*
 928  * TODO: Support for units > 1?
 929  */
 930 acpi_status
 931 acpi_os_signal_semaphore(
 932     acpi_handle             handle,
 933     u32                     units)
 934 {
 935         struct semaphore *sem = (struct semaphore *) handle;
 936
 937         ACPI_FUNCTION_TRACE ("os_signal_semaphore");
 938
 939         if (!sem || (units < 1))
 940                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 941
 942         if (units > 1)
 943                 return_ACPI_STATUS (AE_SUPPORT);
 944
 945         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, units));
 946
 947         up(sem);
 948
 949         return_ACPI_STATUS (AE_OK);
 950 }
 951
 952 u32
 953 acpi_os_get_line(char *buffer)
 954 {
 955
 956 #ifdef ENABLE_DEBUGGER
 957         if (acpi_in_debugger) {
 958                 u32 chars;
 959
 960                 kdb_read(buffer, sizeof(line_buf));
 961
 962                 /* remove the CR kdb includes */
 963                 chars = strlen(buffer) - 1;
 964                 buffer[chars] = '\0';
 965         }
 966 #endif
 967
 968         return 0;
 969 }
 970
 971 /* Assumes no unreadable holes inbetween */
 972 u8
 973 acpi_os_readable(void *ptr, acpi_size len)
 974 {
 975 #if defined(__i386__) || defined(__x86_64__)
 976         char tmp;
 977         return !__get_user(tmp, (char __user *)ptr) && !__get_user(tmp, (char __user *)ptr + len - 1);
 978 #endif
 979         return 1;
 980 }
 981
 982 u8
 983 acpi_os_writable(void *ptr, acpi_size len)
 984 {
 985         /* could do dummy write (racy) or a kernel page table lookup.
 986            The later may be difficult at early boot when kmap doesn't work yet. */
 987         return 1;
 988 }
 989
 990 u32
 991 acpi_os_get_thread_id (void)
 992 {
 993         if (!in_atomic())
 994                 return current->pid;
 995
 996         return 0;
 997 }
 998
 999 acpi_status
1000 acpi_os_signal (
1001     u32         function,
1002     void        *info)
1003 {
1004         switch (function)
1005         {
1006         case ACPI_SIGNAL_FATAL:
1007                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
1008                 break;
1009         case ACPI_SIGNAL_BREAKPOINT:
1010                 {
1011                         char *bp_info = (char*) info;
1012
1013                         printk(KERN_ERR "ACPI breakpoint: %s\n", bp_info);
1014                 }
1015         default:
1016                 break;
1017         }
1018
1019         return AE_OK;
1020 }
1021
1022 int __init
1023 acpi_os_name_setup(char *str)
1024 {
1025         char *p = acpi_os_name;
1026         int count = ACPI_MAX_OVERRIDE_LEN-1;
1027
1028         if (!str || !*str)
1029                 return 0;
1030
1031         for (; count-- && str && *str; str++) {
1032                 if (isalnum(*str) || *str == ' ' || *str == ':')
1033                         *p++ = *str;
1034                 else if (*str == '\'' || *str == '"')
1035                         continue;
1036                 else
1037                         break;
1038         }
1039         *p = 0;
1040
1041         return 1;
1042
1043 }
1044
1045 __setup("acpi_os_name=", acpi_os_name_setup);
1046
1047 /*
1048  * _OSI control
1049  * empty string disables _OSI
1050  * TBD additional string adds to _OSI
1051  */
1052 int __init
1053 acpi_osi_setup(char *str)
1054 {
1055         if (str == NULL || *str == '\0') {
1056                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1057                 acpi_gbl_create_osi_method = FALSE;
1058         } else
1059         {
1060                 /* TBD */
1061                 printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n", str);
1062         }
1063
1064         return 1;
1065 }
1066
1067 __setup("acpi_osi=", acpi_osi_setup);
1068
1069 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1070 int __init
1071 acpi_serialize_setup(char *str)
1072 {
1073         printk(KERN_INFO PREFIX "serialize enabled\n");
1074
1075         acpi_gbl_all_methods_serialized = TRUE;
1076
1077         return 1;
1078 }
1079
1080 __setup("acpi_serialize", acpi_serialize_setup);
1081
1082 /*
1083  * Wake and Run-Time GPES are expected to be separate.
1084  * We disable wake-GPEs at run-time to prevent spurious
1085  * interrupts.
1086  *
1087  * However, if a system exists that shares Wake and
1088  * Run-time events on the same GPE this flag is available
1089  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1090  */
1091 int __init
1092 acpi_wake_gpes_always_on_setup(char *str)
1093 {
1094         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1095
1096         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1097
1098         return 1;
1099 }
1100
1101 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1102