sys/dev/acpica5/acpi_resource.c

   1 /*-
   2  * Copyright (c) 2000 Michael Smith
   3  * Copyright (c) 2000 BSDi
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/dev/acpica/acpi_resource.c,v 1.20 2003/09/26 05:24:55 njl Exp $
  28  * $DragonFly: src/sys/dev/acpica5/acpi_resource.c,v 1.1 2004/02/21 06:48:08 dillon Exp $
  29  */
  30
  31 #include "opt_acpi.h"
  32 #include <sys/param.h>
  33 #include <sys/kernel.h>
  34 #include <sys/bus.h>
  35
  36 #include <machine/bus.h>
  37 #include <machine/resource.h>
  38 #include <sys/rman.h>
  39
  40 #include "acpi.h"
  41 #include <dev/acpica5/acpivar.h>
  42
  43 /* Hooks for the ACPI CA debugging infrastructure */
  44 #define _COMPONENT      ACPI_BUS
  45 ACPI_MODULE_NAME("RESOURCE")
  46
  47 /*
  48  * Fetch a device's resources and associate them with the device.
  49  *
  50  * Note that it might be nice to also locate ACPI-specific resource items, such
  51  * as GPE bits.
  52  *
  53  * We really need to split the resource-fetching code out from the
  54  * resource-parsing code, since we may want to use the parsing
  55  * code for _PRS someday.
  56  */
  57 ACPI_STATUS
  58 acpi_parse_resources(device_t dev, ACPI_HANDLE handle,
  59                      struct acpi_parse_resource_set *set)
  60 {
  61     ACPI_BUFFER         buf;
  62     ACPI_RESOURCE       *res;
  63     char                *curr, *last;
  64     ACPI_STATUS         status;
  65     void                *context;
  66
  67     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  68
  69     /*
  70      * Special-case some devices that abuse _PRS/_CRS to mean
  71      * something other than "I consume this resource".
  72      *
  73      * XXX do we really need this?  It's only relevant once
  74      *     we start always-allocating these resources, and even
  75      *     then, the only special-cased device is likely to be
  76      *     the PCI interrupt link.
  77      */
  78
  79     /* Fetch the device's current resources. */
  80     buf.Length = ACPI_ALLOCATE_BUFFER;
  81     if (ACPI_FAILURE((status = AcpiGetCurrentResources(handle, &buf)))) {
  82         if (status != AE_NOT_FOUND)
  83             printf("can't fetch resources for %s - %s\n",
  84                    acpi_name(handle), AcpiFormatException(status));
  85         return_ACPI_STATUS (status);
  86     }
  87     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "%s - got %ld bytes of resources\n",
  88                      acpi_name(handle), (long)buf.Length));
  89     set->set_init(dev, &context);
  90
  91     /* Iterate through the resources */
  92     curr = buf.Pointer;
  93     last = (char *)buf.Pointer + buf.Length;
  94     while (curr < last) {
  95         res = (ACPI_RESOURCE *)curr;
  96         curr += res->Length;
  97
  98         /* Handle the individual resource types */
  99         switch(res->Id) {
 100         case ACPI_RSTYPE_END_TAG:
 101             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "EndTag\n"));
 102             curr = last;
 103             break;
 104         case ACPI_RSTYPE_FIXED_IO:
 105             if (res->Data.FixedIo.RangeLength <= 0)
 106                 break;
 107             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "FixedIo 0x%x/%d\n",
 108                              res->Data.FixedIo.BaseAddress,
 109                              res->Data.FixedIo.RangeLength));
 110             set->set_ioport(dev, context,
 111                             res->Data.FixedIo.BaseAddress,
 112                             res->Data.FixedIo.RangeLength);
 113             break;
 114         case ACPI_RSTYPE_IO:
 115             if (res->Data.Io.RangeLength <= 0)
 116                 break;
 117             if (res->Data.Io.MinBaseAddress == res->Data.Io.MaxBaseAddress) {
 118                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Io 0x%x/%d\n",
 119                                  res->Data.Io.MinBaseAddress,
 120                                  res->Data.Io.RangeLength));
 121                 set->set_ioport(dev, context,
 122                                 res->Data.Io.MinBaseAddress,
 123                                 res->Data.Io.RangeLength);
 124             } else {
 125                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Io 0x%x-0x%x/%d\n",
 126                                  res->Data.Io.MinBaseAddress,
 127                                  res->Data.Io.MaxBaseAddress,
 128                                  res->Data.Io.RangeLength));
 129                 set->set_iorange(dev, context,
 130                                  res->Data.Io.MinBaseAddress,
 131                                  res->Data.Io.MaxBaseAddress,
 132                                  res->Data.Io.RangeLength,
 133                                  res->Data.Io.Alignment);
 134             }
 135             break;
 136         case ACPI_RSTYPE_FIXED_MEM32:
 137             if (res->Data.FixedMemory32.RangeLength <= 0)
 138                 break;
 139             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "FixedMemory32 0x%x/%d\n",
 140                               res->Data.FixedMemory32.RangeBaseAddress,
 141                               res->Data.FixedMemory32.RangeLength));
 142             set->set_memory(dev, context,
 143                             res->Data.FixedMemory32.RangeBaseAddress,
 144                             res->Data.FixedMemory32.RangeLength);
 145             break;
 146         case ACPI_RSTYPE_MEM32:
 147             if (res->Data.Memory32.RangeLength <= 0)
 148                 break;
 149             if (res->Data.Memory32.MinBaseAddress ==
 150                 res->Data.Memory32.MaxBaseAddress) {
 151
 152                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory32 0x%x/%d\n",
 153                                   res->Data.Memory32.MinBaseAddress,
 154                                   res->Data.Memory32.RangeLength));
 155                 set->set_memory(dev, context,
 156                                 res->Data.Memory32.MinBaseAddress,
 157                                 res->Data.Memory32.RangeLength);
 158             } else {
 159                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory32 0x%x-0x%x/%d\n",
 160                                  res->Data.Memory32.MinBaseAddress,
 161                                  res->Data.Memory32.MaxBaseAddress,
 162                                  res->Data.Memory32.RangeLength));
 163                 set->set_memoryrange(dev, context,
 164                                      res->Data.Memory32.MinBaseAddress,
 165                                      res->Data.Memory32.MaxBaseAddress,
 166                                      res->Data.Memory32.RangeLength,
 167                                      res->Data.Memory32.Alignment);
 168             }
 169             break;
 170         case ACPI_RSTYPE_MEM24:
 171             if (res->Data.Memory24.RangeLength <= 0)
 172                 break;
 173             if (res->Data.Memory24.MinBaseAddress ==
 174                 res->Data.Memory24.MaxBaseAddress) {
 175
 176                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory24 0x%x/%d\n",
 177                                  res->Data.Memory24.MinBaseAddress,
 178                                  res->Data.Memory24.RangeLength));
 179                 set->set_memory(dev, context, res->Data.Memory24.MinBaseAddress,
 180                                 res->Data.Memory24.RangeLength);
 181             } else {
 182                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory24 0x%x-0x%x/%d\n",
 183                                  res->Data.Memory24.MinBaseAddress,
 184                                  res->Data.Memory24.MaxBaseAddress,
 185                                  res->Data.Memory24.RangeLength));
 186                 set->set_memoryrange(dev, context,
 187                                      res->Data.Memory24.MinBaseAddress,
 188                                      res->Data.Memory24.MaxBaseAddress,
 189                                      res->Data.Memory24.RangeLength,
 190                                      res->Data.Memory24.Alignment);
 191             }
 192             break;
 193         case ACPI_RSTYPE_IRQ:
 194             /*
 195              * from 1.0b 6.4.2
 196              * "This structure is repeated for each separate interrupt
 197              * required"
 198              */
 199             set->set_irq(dev, context, res->Data.Irq.Interrupts,
 200                 res->Data.Irq.NumberOfInterrupts, res->Data.Irq.EdgeLevel,
 201                 res->Data.Irq.ActiveHighLow);
 202             break;
 203         case ACPI_RSTYPE_DMA:
 204             /*
 205              * from 1.0b 6.4.3
 206              * "This structure is repeated for each separate dma channel
 207              * required"
 208              */
 209             set->set_drq(dev, context, res->Data.Dma.Channels,
 210                          res->Data.Dma.NumberOfChannels);
 211             break;
 212         case ACPI_RSTYPE_START_DPF:
 213             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "start dependant functions\n"));
 214             set->set_start_dependant(dev, context,
 215                                      res->Data.StartDpf.CompatibilityPriority);
 216             break;
 217         case ACPI_RSTYPE_END_DPF:
 218             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "end dependant functions\n"));
 219             set->set_end_dependant(dev, context);
 220             break;
 221         case ACPI_RSTYPE_ADDRESS32:
 222             if (res->Data.Address32.AddressLength <= 0)
 223                 break;
 224             if (res->Data.Address32.ProducerConsumer != ACPI_CONSUMER) {
 225                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 226                     "ignored Address32 %s producer\n",
 227                     res->Data.Address32.ResourceType == ACPI_IO_RANGE ?
 228                     "IO" : "Memory"));
 229                 break;
 230             }
 231             if (res->Data.Address32.ResourceType != ACPI_MEMORY_RANGE &&
 232                 res->Data.Address32.ResourceType != ACPI_IO_RANGE) {
 233                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 234                     "ignored Address32 for non-memory, non-I/O\n"));
 235                 break;
 236             }
 237
 238             if (res->Data.Address32.MinAddressFixed == ACPI_ADDRESS_FIXED &&
 239                 res->Data.Address32.MaxAddressFixed == ACPI_ADDRESS_FIXED) {
 240
 241                 if (res->Data.Address32.ResourceType == ACPI_MEMORY_RANGE) {
 242                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 243                                      "Address32/Memory 0x%x/%d\n",
 244                                      res->Data.Address32.MinAddressRange,
 245                                      res->Data.Address32.AddressLength));
 246                     set->set_memory(dev, context,
 247                                     res->Data.Address32.MinAddressRange,
 248                                     res->Data.Address32.AddressLength);
 249                 } else {
 250                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 251                                      "Address32/IO 0x%x/%d\n",
 252                                      res->Data.Address32.MinAddressRange,
 253                                      res->Data.Address32.AddressLength));
 254                     set->set_ioport(dev, context,
 255                                     res->Data.Address32.MinAddressRange,
 256                                     res->Data.Address32.AddressLength);
 257                 }
 258             } else {
 259                 if (res->Data.Address32.ResourceType == ACPI_MEMORY_RANGE) {
 260                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 261                                      "Address32/Memory 0x%x-0x%x/%d\n",
 262                                      res->Data.Address32.MinAddressRange,
 263                                      res->Data.Address32.MaxAddressRange,
 264                                      res->Data.Address32.AddressLength));
 265                     set->set_memoryrange(dev, context,
 266                                           res->Data.Address32.MinAddressRange,
 267                                           res->Data.Address32.MaxAddressRange,
 268                                           res->Data.Address32.AddressLength,
 269                                           res->Data.Address32.Granularity);
 270                 } else {
 271                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 272                                      "Address32/IO 0x%x-0x%x/%d\n",
 273                                      res->Data.Address32.MinAddressRange,
 274                                      res->Data.Address32.MaxAddressRange,
 275                                      res->Data.Address32.AddressLength));
 276                     set->set_iorange(dev, context,
 277                                      res->Data.Address32.MinAddressRange,
 278                                      res->Data.Address32.MaxAddressRange,
 279                                      res->Data.Address32.AddressLength,
 280                                      res->Data.Address32.Granularity);
 281                 }
 282             }
 283             break;
 284         case ACPI_RSTYPE_ADDRESS16:
 285             if (res->Data.Address16.AddressLength <= 0)
 286                 break;
 287             if (res->Data.Address16.ProducerConsumer != ACPI_CONSUMER) {
 288                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 289                     "ignored Address16 %s producer\n",
 290                     res->Data.Address16.ResourceType == ACPI_IO_RANGE ?
 291                     "IO" : "Memory"));
 292                 break;
 293             }
 294             if (res->Data.Address16.ResourceType != ACPI_MEMORY_RANGE &&
 295                 res->Data.Address16.ResourceType != ACPI_IO_RANGE) {
 296                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 297                         "ignored Address16 for non-memory, non-I/O\n"));
 298                 break;
 299             }
 300
 301             if (res->Data.Address16.MinAddressFixed == ACPI_ADDRESS_FIXED &&
 302                 res->Data.Address16.MaxAddressFixed == ACPI_ADDRESS_FIXED) {
 303
 304                 if (res->Data.Address16.ResourceType == ACPI_MEMORY_RANGE) {
 305                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 306                                      "Address16/Memory 0x%x/%d\n",
 307                                      res->Data.Address16.MinAddressRange,
 308                                      res->Data.Address16.AddressLength));
 309                     set->set_memory(dev, context,
 310                                     res->Data.Address16.MinAddressRange,
 311                                     res->Data.Address16.AddressLength);
 312                 } else {
 313                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 314                                      "Address16/IO 0x%x/%d\n",
 315                                      res->Data.Address16.MinAddressRange,
 316                                      res->Data.Address16.AddressLength));
 317                     set->set_ioport(dev, context,
 318                                     res->Data.Address16.MinAddressRange,
 319                                     res->Data.Address16.AddressLength);
 320                 }
 321             } else {
 322                 if (res->Data.Address16.ResourceType == ACPI_MEMORY_RANGE) {
 323                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 324                                      "Address16/Memory 0x%x-0x%x/%d\n",
 325                                      res->Data.Address16.MinAddressRange,
 326                                      res->Data.Address16.MaxAddressRange,
 327                                      res->Data.Address16.AddressLength));
 328                     set->set_memoryrange(dev, context,
 329                                           res->Data.Address16.MinAddressRange,
 330                                           res->Data.Address16.MaxAddressRange,
 331                                           res->Data.Address16.AddressLength,
 332                                           res->Data.Address16.Granularity);
 333                 } else {
 334                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 335                                      "Address16/IO 0x%x-0x%x/%d\n",
 336                                      res->Data.Address16.MinAddressRange,
 337                                      res->Data.Address16.MaxAddressRange,
 338                                      res->Data.Address16.AddressLength));
 339                     set->set_iorange(dev, context,
 340                                      res->Data.Address16.MinAddressRange,
 341                                      res->Data.Address16.MaxAddressRange,
 342                                      res->Data.Address16.AddressLength,
 343                                      res->Data.Address16.Granularity);
 344                 }
 345             }
 346             break;
 347         case ACPI_RSTYPE_ADDRESS64:
 348             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 349                              "unimplemented Address64 resource\n"));
 350             break;
 351         case ACPI_RSTYPE_EXT_IRQ:
 352             /* XXX special handling? */
 353             set->set_irq(dev, context,res->Data.ExtendedIrq.Interrupts,
 354                 res->Data.ExtendedIrq.NumberOfInterrupts,
 355                 res->Data.ExtendedIrq.EdgeLevel,
 356                 res->Data.ExtendedIrq.ActiveHighLow);
 357             break;
 358         case ACPI_RSTYPE_VENDOR:
 359             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 360                              "unimplemented VendorSpecific resource\n"));
 361             break;
 362         default:
 363             break;
 364         }
 365     }
 366
 367     AcpiOsFree(buf.Pointer);
 368     set->set_done(dev, context);
 369     return_ACPI_STATUS (AE_OK);
 370 }
 371
 372 /*
 373  * Resource-set vectors used to attach _CRS-derived resources
 374  * to an ACPI device.
 375  */
 376 static void     acpi_res_set_init(device_t dev, void **context);
 377 static void     acpi_res_set_done(device_t dev, void *context);
 378 static void     acpi_res_set_ioport(device_t dev, void *context,
 379                                     u_int32_t base, u_int32_t length);
 380 static void     acpi_res_set_iorange(device_t dev, void *context,
 381                                      u_int32_t low, u_int32_t high,
 382                                      u_int32_t length, u_int32_t align);
 383 static void     acpi_res_set_memory(device_t dev, void *context,
 384                                     u_int32_t base, u_int32_t length);
 385 static void     acpi_res_set_memoryrange(device_t dev, void *context,
 386                                          u_int32_t low, u_int32_t high,
 387                                          u_int32_t length, u_int32_t align);
 388 static void     acpi_res_set_irq(device_t dev, void *context, u_int32_t *irq,
 389                                  int count, int trig, int pol);
 390 static void     acpi_res_set_drq(device_t dev, void *context, u_int32_t *drq,
 391                                  int count);
 392 static void     acpi_res_set_start_dependant(device_t dev, void *context,
 393                                              int preference);
 394 static void     acpi_res_set_end_dependant(device_t dev, void *context);
 395
 396 struct acpi_parse_resource_set acpi_res_parse_set = {
 397     acpi_res_set_init,
 398     acpi_res_set_done,
 399     acpi_res_set_ioport,
 400     acpi_res_set_iorange,
 401     acpi_res_set_memory,
 402     acpi_res_set_memoryrange,
 403     acpi_res_set_irq,
 404     acpi_res_set_drq,
 405     acpi_res_set_start_dependant,
 406     acpi_res_set_end_dependant
 407 };
 408
 409 struct acpi_res_context {
 410     int         ar_nio;
 411     int         ar_nmem;
 412     int         ar_nirq;
 413     int         ar_ndrq;
 414 };
 415
 416 static void
 417 acpi_res_set_init(device_t dev, void **context)
 418 {
 419     struct acpi_res_context     *cp;
 420
 421     if ((cp = AcpiOsAllocate(sizeof(*cp))) != NULL) {
 422         bzero(cp, sizeof(*cp));
 423         *context = cp;
 424     }
 425 }
 426
 427 static void
 428 acpi_res_set_done(device_t dev, void *context)
 429 {
 430     struct acpi_res_context     *cp = (struct acpi_res_context *)context;
 431
 432     if (cp == NULL)
 433         return;
 434     AcpiOsFree(cp);
 435 }
 436
 437 static void
 438 acpi_res_set_ioport(device_t dev, void *context, u_int32_t base,
 439                     u_int32_t length)
 440 {
 441     struct acpi_res_context     *cp = (struct acpi_res_context *)context;
 442
 443     if (cp == NULL)
 444         return;
 445     bus_set_resource(dev, SYS_RES_IOPORT, cp->ar_nio++, base, length);
 446 }
 447
 448 static void
 449 acpi_res_set_iorange(device_t dev, void *context, u_int32_t low,
 450                      u_int32_t high, u_int32_t length, u_int32_t align)
 451 {
 452     struct acpi_res_context     *cp = (struct acpi_res_context *)context;
 453
 454     if (cp == NULL)
 455         return;
 456     device_printf(dev, "I/O range not supported\n");
 457 }
 458
 459 static void
 460 acpi_res_set_memory(device_t dev, void *context, u_int32_t base,
 461                     u_int32_t length)
 462 {
 463     struct acpi_res_context     *cp = (struct acpi_res_context *)context;
 464
 465     if (cp == NULL)
 466         return;
 467
 468     bus_set_resource(dev, SYS_RES_MEMORY, cp->ar_nmem++, base, length);
 469 }
 470
 471 static void
 472 acpi_res_set_memoryrange(device_t dev, void *context, u_int32_t low,
 473                          u_int32_t high, u_int32_t length, u_int32_t align)
 474 {
 475     struct acpi_res_context     *cp = (struct acpi_res_context *)context;
 476
 477     if (cp == NULL)
 478         return;
 479     device_printf(dev, "memory range not supported\n");
 480 }
 481
 482 static void
 483 acpi_res_set_irq(device_t dev, void *context, u_int32_t *irq, int count,
 484     int trig, int pol)
 485 {
 486     struct acpi_res_context     *cp = (struct acpi_res_context *)context;
 487
 488     if (cp == NULL || irq == NULL)
 489         return;
 490
 491     /* This implements no resource relocation. */
 492     if (count != 1)
 493         return;
 494
 495     bus_set_resource(dev, SYS_RES_IRQ, cp->ar_nirq++, *irq, 1);
 496 #if 0   /* From FreeBSD-5 XXX */
 497     BUS_CONFIG_INTR(dev, *irq, (trig == ACPI_EDGE_SENSITIVE) ?
 498         INTR_TRIGGER_EDGE : INTR_TRIGGER_LEVEL, (pol == ACPI_ACTIVE_HIGH) ?
 499         INTR_POLARITY_HIGH : INTR_POLARITY_LOW);
 500 #endif
 501 }
 502
 503 static void
 504 acpi_res_set_drq(device_t dev, void *context, u_int32_t *drq, int count)
 505 {
 506     struct acpi_res_context     *cp = (struct acpi_res_context *)context;
 507
 508     if (cp == NULL || drq == NULL)
 509         return;
 510
 511     /* This implements no resource relocation. */
 512     if (count != 1)
 513         return;
 514
 515     bus_set_resource(dev, SYS_RES_DRQ, cp->ar_ndrq++, *drq, 1);
 516 }
 517
 518 static void
 519 acpi_res_set_start_dependant(device_t dev, void *context, int preference)
 520 {
 521     struct acpi_res_context     *cp = (struct acpi_res_context *)context;
 522
 523     if (cp == NULL)
 524         return;
 525     device_printf(dev, "dependant functions not supported\n");
 526 }
 527
 528 static void
 529 acpi_res_set_end_dependant(device_t dev, void *context)
 530 {
 531     struct acpi_res_context     *cp = (struct acpi_res_context *)context;
 532
 533     if (cp == NULL)
 534         return;
 535     device_printf(dev, "dependant functions not supported\n");
 536 }
 537
 538 /*
 539  * Resource-owning placeholders.
 540  *
 541  * This code "owns" system resource objects that aren't
 542  * otherwise useful to devices, and which shouldn't be
 543  * considered "free".
 544  *
 545  * Note that some systems claim *all* of the physical address space
 546  * with a PNP0C01 device, so we cannot correctly "own" system memory
 547  * here (must be done in the SMAP handler on x86 systems, for
 548  * example).
 549  */
 550
 551 static int      acpi_sysresource_probe(device_t dev);
 552 static int      acpi_sysresource_attach(device_t dev);
 553
 554 static device_method_t acpi_sysresource_methods[] = {
 555     /* Device interface */
 556     DEVMETHOD(device_probe,     acpi_sysresource_probe),
 557     DEVMETHOD(device_attach,    acpi_sysresource_attach),
 558
 559     {0, 0}
 560 };
 561
 562 static driver_t acpi_sysresource_driver = {
 563     "acpi_sysresource",
 564     acpi_sysresource_methods,
 565     0,
 566 };
 567
 568 static devclass_t acpi_sysresource_devclass;
 569 DRIVER_MODULE(acpi_sysresource, acpi, acpi_sysresource_driver,
 570               acpi_sysresource_devclass, 0, 0);
 571
 572 static int
 573 acpi_sysresource_probe(device_t dev)
 574 {
 575     if (!acpi_disabled("sysresource") && acpi_MatchHid(dev, "PNP0C02"))
 576         device_set_desc(dev, "System Resource");
 577     else
 578         return (ENXIO);
 579
 580     device_quiet(dev);
 581     return (-100);
 582 }
 583
 584 static int
 585 acpi_sysresource_attach(device_t dev)
 586 {
 587     struct resource     *res;
 588     int                 i, rid;
 589
 590     /*
 591      * Suck up all the resources that might have been assigned to us.
 592      * Note that it's impossible to tell the difference between a
 593      * resource that someone else has claimed, and one that doesn't
 594      * exist.
 595      */
 596     for (i = 0; i < 100; i++) {
 597         rid = i;
 598         res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, 1, 0);
 599         rid = i;
 600         res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, 0, ~0, 1, 0);
 601         rid = i;
 602         res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
 603                                  RF_SHAREABLE);
 604     }
 605
 606     return (0);
 607 }