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 1.24 2004/05/30 20:08:23 phk Exp $
  28  * $DragonFly: src/sys/dev/acpica5/acpi_resource.c,v 1.5 2006/12/22 23:26:14 swildner Exp $
  29  */
  30
  31 #include "opt_acpi.h"
  32 #include <sys/param.h>
  33 #include <sys/kernel.h>
  34 #include <sys/bus.h>
  35 #include <sys/module.h>
  36 #include <sys/rman.h>
  37
  38 #include "acpi.h"
  39 #include <dev/acpica5/acpivar.h>
  40
  41 /* Hooks for the ACPI CA debugging infrastructure */
  42 #define _COMPONENT      ACPI_BUS
  43 ACPI_MODULE_NAME("RESOURCE")
  44
  45 /*
  46  * Fetch a device's resources and associate them with the device.
  47  *
  48  * Note that it might be nice to also locate ACPI-specific resource items, such
  49  * as GPE bits.
  50  *
  51  * We really need to split the resource-fetching code out from the
  52  * resource-parsing code, since we may want to use the parsing
  53  * code for _PRS someday.
  54  */
  55 ACPI_STATUS
  56 acpi_parse_resources(device_t dev, ACPI_HANDLE handle,
  57                      struct acpi_parse_resource_set *set, void *arg)
  58 {
  59     ACPI_BUFFER         buf;
  60     ACPI_RESOURCE       *res;
  61     char                *curr, *last;
  62     ACPI_STATUS         status;
  63     void                *context;
  64
  65     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  66
  67     /*
  68      * Special-case some devices that abuse _PRS/_CRS to mean
  69      * something other than "I consume this resource".
  70      *
  71      * XXX do we really need this?  It's only relevant once
  72      *     we start always-allocating these resources, and even
  73      *     then, the only special-cased device is likely to be
  74      *     the PCI interrupt link.
  75      */
  76
  77     /* Fetch the device's current resources. */
  78     buf.Length = ACPI_ALLOCATE_BUFFER;
  79     if (ACPI_FAILURE((status = AcpiGetCurrentResources(handle, &buf)))) {
  80         if (status != AE_NOT_FOUND)
  81             kprintf("can't fetch resources for %s - %s\n",
  82                    acpi_name(handle), AcpiFormatException(status));
  83         return_ACPI_STATUS (status);
  84     }
  85     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "%s - got %ld bytes of resources\n",
  86                      acpi_name(handle), (long)buf.Length));
  87     set->set_init(dev, arg, &context);
  88
  89     /* Iterate through the resources */
  90     curr = buf.Pointer;
  91     last = (char *)buf.Pointer + buf.Length;
  92     while (curr < last) {
  93         res = (ACPI_RESOURCE *)curr;
  94         curr += res->Length;
  95
  96         /* Handle the individual resource types */
  97         switch(res->Id) {
  98         case ACPI_RSTYPE_END_TAG:
  99             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "EndTag\n"));
 100             curr = last;
 101             break;
 102         case ACPI_RSTYPE_FIXED_IO:
 103             if (res->Data.FixedIo.RangeLength <= 0)
 104                 break;
 105             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "FixedIo 0x%x/%d\n",
 106                              res->Data.FixedIo.BaseAddress,
 107                              res->Data.FixedIo.RangeLength));
 108             set->set_ioport(dev, context,
 109                             res->Data.FixedIo.BaseAddress,
 110                             res->Data.FixedIo.RangeLength);
 111             break;
 112         case ACPI_RSTYPE_IO:
 113             if (res->Data.Io.RangeLength <= 0)
 114                 break;
 115             if (res->Data.Io.MinBaseAddress == res->Data.Io.MaxBaseAddress) {
 116                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Io 0x%x/%d\n",
 117                                  res->Data.Io.MinBaseAddress,
 118                                  res->Data.Io.RangeLength));
 119                 set->set_ioport(dev, context,
 120                                 res->Data.Io.MinBaseAddress,
 121                                 res->Data.Io.RangeLength);
 122             } else {
 123                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Io 0x%x-0x%x/%d\n",
 124                                  res->Data.Io.MinBaseAddress,
 125                                  res->Data.Io.MaxBaseAddress,
 126                                  res->Data.Io.RangeLength));
 127                 set->set_iorange(dev, context,
 128                                  res->Data.Io.MinBaseAddress,
 129                                  res->Data.Io.MaxBaseAddress,
 130                                  res->Data.Io.RangeLength,
 131                                  res->Data.Io.Alignment);
 132             }
 133             break;
 134         case ACPI_RSTYPE_FIXED_MEM32:
 135             if (res->Data.FixedMemory32.RangeLength <= 0)
 136                 break;
 137             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "FixedMemory32 0x%x/%d\n",
 138                               res->Data.FixedMemory32.RangeBaseAddress,
 139                               res->Data.FixedMemory32.RangeLength));
 140             set->set_memory(dev, context,
 141                             res->Data.FixedMemory32.RangeBaseAddress,
 142                             res->Data.FixedMemory32.RangeLength);
 143             break;
 144         case ACPI_RSTYPE_MEM32:
 145             if (res->Data.Memory32.RangeLength <= 0)
 146                 break;
 147             if (res->Data.Memory32.MinBaseAddress ==
 148                 res->Data.Memory32.MaxBaseAddress) {
 149
 150                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory32 0x%x/%d\n",
 151                                   res->Data.Memory32.MinBaseAddress,
 152                                   res->Data.Memory32.RangeLength));
 153                 set->set_memory(dev, context,
 154                                 res->Data.Memory32.MinBaseAddress,
 155                                 res->Data.Memory32.RangeLength);
 156             } else {
 157                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory32 0x%x-0x%x/%d\n",
 158                                  res->Data.Memory32.MinBaseAddress,
 159                                  res->Data.Memory32.MaxBaseAddress,
 160                                  res->Data.Memory32.RangeLength));
 161                 set->set_memoryrange(dev, context,
 162                                      res->Data.Memory32.MinBaseAddress,
 163                                      res->Data.Memory32.MaxBaseAddress,
 164                                      res->Data.Memory32.RangeLength,
 165                                      res->Data.Memory32.Alignment);
 166             }
 167             break;
 168         case ACPI_RSTYPE_MEM24:
 169             if (res->Data.Memory24.RangeLength <= 0)
 170                 break;
 171             if (res->Data.Memory24.MinBaseAddress ==
 172                 res->Data.Memory24.MaxBaseAddress) {
 173
 174                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory24 0x%x/%d\n",
 175                                  res->Data.Memory24.MinBaseAddress,
 176                                  res->Data.Memory24.RangeLength));
 177                 set->set_memory(dev, context, res->Data.Memory24.MinBaseAddress,
 178                                 res->Data.Memory24.RangeLength);
 179             } else {
 180                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "Memory24 0x%x-0x%x/%d\n",
 181                                  res->Data.Memory24.MinBaseAddress,
 182                                  res->Data.Memory24.MaxBaseAddress,
 183                                  res->Data.Memory24.RangeLength));
 184                 set->set_memoryrange(dev, context,
 185                                      res->Data.Memory24.MinBaseAddress,
 186                                      res->Data.Memory24.MaxBaseAddress,
 187                                      res->Data.Memory24.RangeLength,
 188                                      res->Data.Memory24.Alignment);
 189             }
 190             break;
 191         case ACPI_RSTYPE_IRQ:
 192             /*
 193              * from 1.0b 6.4.2
 194              * "This structure is repeated for each separate interrupt
 195              * required"
 196              */
 197             set->set_irq(dev, context, res->Data.Irq.Interrupts,
 198                 res->Data.Irq.NumberOfInterrupts, res->Data.Irq.EdgeLevel,
 199                 res->Data.Irq.ActiveHighLow);
 200             break;
 201         case ACPI_RSTYPE_DMA:
 202             /*
 203              * from 1.0b 6.4.3
 204              * "This structure is repeated for each separate dma channel
 205              * required"
 206              */
 207             set->set_drq(dev, context, res->Data.Dma.Channels,
 208                          res->Data.Dma.NumberOfChannels);
 209             break;
 210         case ACPI_RSTYPE_START_DPF:
 211             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "start dependant functions\n"));
 212             set->set_start_dependant(dev, context,
 213                                      res->Data.StartDpf.CompatibilityPriority);
 214             break;
 215         case ACPI_RSTYPE_END_DPF:
 216             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "end dependant functions\n"));
 217             set->set_end_dependant(dev, context);
 218             break;
 219         case ACPI_RSTYPE_ADDRESS32:
 220             if (res->Data.Address32.AddressLength <= 0)
 221                 break;
 222             if (res->Data.Address32.ProducerConsumer != ACPI_CONSUMER) {
 223                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 224                     "ignored Address32 %s producer\n",
 225                     res->Data.Address32.ResourceType == ACPI_IO_RANGE ?
 226                     "IO" : "Memory"));
 227                 break;
 228             }
 229             if (res->Data.Address32.ResourceType != ACPI_MEMORY_RANGE &&
 230                 res->Data.Address32.ResourceType != ACPI_IO_RANGE) {
 231                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 232                     "ignored Address32 for non-memory, non-I/O\n"));
 233                 break;
 234             }
 235
 236             if (res->Data.Address32.MinAddressFixed == ACPI_ADDRESS_FIXED &&
 237                 res->Data.Address32.MaxAddressFixed == ACPI_ADDRESS_FIXED) {
 238
 239                 if (res->Data.Address32.ResourceType == ACPI_MEMORY_RANGE) {
 240                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 241                                      "Address32/Memory 0x%x/%d\n",
 242                                      res->Data.Address32.MinAddressRange,
 243                                      res->Data.Address32.AddressLength));
 244                     set->set_memory(dev, context,
 245                                     res->Data.Address32.MinAddressRange,
 246                                     res->Data.Address32.AddressLength);
 247                 } else {
 248                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 249                                      "Address32/IO 0x%x/%d\n",
 250                                      res->Data.Address32.MinAddressRange,
 251                                      res->Data.Address32.AddressLength));
 252                     set->set_ioport(dev, context,
 253                                     res->Data.Address32.MinAddressRange,
 254                                     res->Data.Address32.AddressLength);
 255                 }
 256             } else {
 257                 if (res->Data.Address32.ResourceType == ACPI_MEMORY_RANGE) {
 258                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 259                                      "Address32/Memory 0x%x-0x%x/%d\n",
 260                                      res->Data.Address32.MinAddressRange,
 261                                      res->Data.Address32.MaxAddressRange,
 262                                      res->Data.Address32.AddressLength));
 263                     set->set_memoryrange(dev, context,
 264                                           res->Data.Address32.MinAddressRange,
 265                                           res->Data.Address32.MaxAddressRange,
 266                                           res->Data.Address32.AddressLength,
 267                                           res->Data.Address32.Granularity);
 268                 } else {
 269                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 270                                      "Address32/IO 0x%x-0x%x/%d\n",
 271                                      res->Data.Address32.MinAddressRange,
 272                                      res->Data.Address32.MaxAddressRange,
 273                                      res->Data.Address32.AddressLength));
 274                     set->set_iorange(dev, context,
 275                                      res->Data.Address32.MinAddressRange,
 276                                      res->Data.Address32.MaxAddressRange,
 277                                      res->Data.Address32.AddressLength,
 278                                      res->Data.Address32.Granularity);
 279                 }
 280             }
 281             break;
 282         case ACPI_RSTYPE_ADDRESS16:
 283             if (res->Data.Address16.AddressLength <= 0)
 284                 break;
 285             if (res->Data.Address16.ProducerConsumer != ACPI_CONSUMER) {
 286                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 287                     "ignored Address16 %s producer\n",
 288                     res->Data.Address16.ResourceType == ACPI_IO_RANGE ?
 289                     "IO" : "Memory"));
 290                 break;
 291             }
 292             if (res->Data.Address16.ResourceType != ACPI_MEMORY_RANGE &&
 293                 res->Data.Address16.ResourceType != ACPI_IO_RANGE) {
 294                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 295                         "ignored Address16 for non-memory, non-I/O\n"));
 296                 break;
 297             }
 298
 299             if (res->Data.Address16.MinAddressFixed == ACPI_ADDRESS_FIXED &&
 300                 res->Data.Address16.MaxAddressFixed == ACPI_ADDRESS_FIXED) {
 301
 302                 if (res->Data.Address16.ResourceType == ACPI_MEMORY_RANGE) {
 303                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 304                                      "Address16/Memory 0x%x/%d\n",
 305                                      res->Data.Address16.MinAddressRange,
 306                                      res->Data.Address16.AddressLength));
 307                     set->set_memory(dev, context,
 308                                     res->Data.Address16.MinAddressRange,
 309                                     res->Data.Address16.AddressLength);
 310                 } else {
 311                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 312                                      "Address16/IO 0x%x/%d\n",
 313                                      res->Data.Address16.MinAddressRange,
 314                                      res->Data.Address16.AddressLength));
 315                     set->set_ioport(dev, context,
 316                                     res->Data.Address16.MinAddressRange,
 317                                     res->Data.Address16.AddressLength);
 318                 }
 319             } else {
 320                 if (res->Data.Address16.ResourceType == ACPI_MEMORY_RANGE) {
 321                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 322                                      "Address16/Memory 0x%x-0x%x/%d\n",
 323                                      res->Data.Address16.MinAddressRange,
 324                                      res->Data.Address16.MaxAddressRange,
 325                                      res->Data.Address16.AddressLength));
 326                     set->set_memoryrange(dev, context,
 327                                           res->Data.Address16.MinAddressRange,
 328                                           res->Data.Address16.MaxAddressRange,
 329                                           res->Data.Address16.AddressLength,
 330                                           res->Data.Address16.Granularity);
 331                 } else {
 332                     ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 333                                      "Address16/IO 0x%x-0x%x/%d\n",
 334                                      res->Data.Address16.MinAddressRange,
 335                                      res->Data.Address16.MaxAddressRange,
 336                                      res->Data.Address16.AddressLength));
 337                     set->set_iorange(dev, context,
 338                                      res->Data.Address16.MinAddressRange,
 339                                      res->Data.Address16.MaxAddressRange,
 340                                      res->Data.Address16.AddressLength,
 341                                      res->Data.Address16.Granularity);
 342                 }
 343             }
 344             break;
 345         case ACPI_RSTYPE_ADDRESS64:
 346             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 347                              "unimplemented Address64 resource\n"));
 348             break;
 349         case ACPI_RSTYPE_EXT_IRQ:
 350             /* XXX special handling? */
 351             set->set_irq(dev, context,res->Data.ExtendedIrq.Interrupts,
 352                 res->Data.ExtendedIrq.NumberOfInterrupts,
 353                 res->Data.ExtendedIrq.EdgeLevel,
 354                 res->Data.ExtendedIrq.ActiveHighLow);
 355             break;
 356         case ACPI_RSTYPE_VENDOR:
 357             ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 358                              "unimplemented VendorSpecific resource\n"));
 359             break;
 360         default:
 361             break;
 362         }
 363     }
 364
 365     AcpiOsFree(buf.Pointer);
 366     set->set_done(dev, context);
 367     return_ACPI_STATUS (AE_OK);
 368 }
 369
 370 /*
 371  * Resource-set vectors used to attach _CRS-derived resources
 372  * to an ACPI device.
 373  */
 374 static void     acpi_res_set_init(device_t dev, void *arg, void **context);
 375 static void     acpi_res_set_done(device_t dev, void *context);
 376 static void     acpi_res_set_ioport(device_t dev, void *context,
 377                                     u_int32_t base, u_int32_t length);
 378 static void     acpi_res_set_iorange(device_t dev, void *context,
 379                                      u_int32_t low, u_int32_t high,
 380                                      u_int32_t length, u_int32_t align);
 381 static void     acpi_res_set_memory(device_t dev, void *context,
 382                                     u_int32_t base, u_int32_t length);
 383 static void     acpi_res_set_memoryrange(device_t dev, void *context,
 384                                          u_int32_t low, u_int32_t high,
 385                                          u_int32_t length, u_int32_t align);
 386 static void     acpi_res_set_irq(device_t dev, void *context, u_int32_t *irq,
 387                                  int count, int trig, int pol);
 388 static void     acpi_res_set_drq(device_t dev, void *context, u_int32_t *drq,
 389                                  int count);
 390 static void     acpi_res_set_start_dependant(device_t dev, void *context,
 391                                              int preference);
 392 static void     acpi_res_set_end_dependant(device_t dev, void *context);
 393
 394 struct acpi_parse_resource_set acpi_res_parse_set = {
 395     acpi_res_set_init,
 396     acpi_res_set_done,
 397     acpi_res_set_ioport,
 398     acpi_res_set_iorange,
 399     acpi_res_set_memory,
 400     acpi_res_set_memoryrange,
 401     acpi_res_set_irq,
 402     acpi_res_set_drq,
 403     acpi_res_set_start_dependant,
 404     acpi_res_set_end_dependant
 405 };
 406
 407 struct acpi_res_context {
 408     int         ar_nio;
 409     int         ar_nmem;
 410     int         ar_nirq;
 411     int         ar_ndrq;
 412     void        *ar_parent;
 413 };
 414
 415 static void
 416 acpi_res_set_init(device_t dev, void *arg, void **context)
 417 {
 418     struct acpi_res_context     *cp;
 419
 420     if ((cp = AcpiOsAllocate(sizeof(*cp))) != NULL) {
 421         bzero(cp, sizeof(*cp));
 422         cp->ar_parent = arg;
 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 MODULE_DEPEND(acpi_sysresource, acpi, 1, 1, 1);
 572
 573 static int
 574 acpi_sysresource_probe(device_t dev)
 575 {
 576     if (!acpi_disabled("sysresource") && acpi_MatchHid(dev, "PNP0C02"))
 577         device_set_desc(dev, "System Resource");
 578     else
 579         return (ENXIO);
 580
 581     device_quiet(dev);
 582     return (-100);
 583 }
 584
 585 static int
 586 acpi_sysresource_attach(device_t dev)
 587 {
 588     struct resource     *res;
 589     int                 i, rid;
 590
 591     /*
 592      * Suck up all the resources that might have been assigned to us.
 593      * Note that it's impossible to tell the difference between a
 594      * resource that someone else has claimed, and one that doesn't
 595      * exist.
 596      */
 597     for (i = 0; i < 100; i++) {
 598         rid = i;
 599         res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, 0);
 600         rid = i;
 601         res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
 602         rid = i;
 603         res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_SHAREABLE);
 604     }
 605
 606     return (0);
 607 }