1/****************************************************************************** 2 * 3 * Module Name: exregion - ACPI default OpRegion (address space) handlers 4 * 5 *****************************************************************************/ 6 7/****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2023, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152#include "acpi.h" 153#include "accommon.h" 154#include "acinterp.h" 155 156 157#define _COMPONENT ACPI_EXECUTER 158 ACPI_MODULE_NAME ("exregion") 159 160 161/******************************************************************************* 162 * 163 * FUNCTION: AcpiExSystemMemorySpaceHandler 164 * 165 * PARAMETERS: Function - Read or Write operation 166 * Address - Where in the space to read or write 167 * BitWidth - Field width in bits (8, 16, or 32) 168 * Value - Pointer to in or out value 169 * HandlerContext - Pointer to Handler's context 170 * RegionContext - Pointer to context specific to the 171 * accessed region 172 * 173 * RETURN: Status 174 * 175 * DESCRIPTION: Handler for the System Memory address space (Op Region) 176 * 177 ******************************************************************************/ 178 179ACPI_STATUS 180AcpiExSystemMemorySpaceHandler ( 181 UINT32 Function, 182 ACPI_PHYSICAL_ADDRESS Address, 183 UINT32 BitWidth, 184 UINT64 *Value, 185 void *HandlerContext, 186 void *RegionContext) 187{ 188 ACPI_STATUS Status = AE_OK; 189 void *LogicalAddrPtr = NULL; 190 ACPI_MEM_SPACE_CONTEXT *MemInfo = RegionContext; 191 ACPI_MEM_MAPPING *Mm = MemInfo->CurMm; 192 UINT32 Length; 193 ACPI_SIZE MapLength; 194 ACPI_SIZE PageBoundaryMapLength; 195#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED 196 UINT32 Remainder; 197#endif 198 199 200 ACPI_FUNCTION_TRACE (ExSystemMemorySpaceHandler); 201 202 203 /* Validate and translate the bit width */ 204 205 switch (BitWidth) 206 { 207 case 8: 208 209 Length = 1; 210 break; 211 212 case 16: 213 214 Length = 2; 215 break; 216 217 case 32: 218 219 Length = 4; 220 break; 221 222 case 64: 223 224 Length = 8; 225 break; 226 227 default: 228 229 ACPI_ERROR ((AE_INFO, "Invalid SystemMemory width %u", 230 BitWidth)); 231 return_ACPI_STATUS (AE_AML_OPERAND_VALUE); 232 } 233 234#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED 235 /* 236 * Hardware does not support non-aligned data transfers, we must verify 237 * the request. 238 */ 239 (void) AcpiUtShortDivide ((UINT64) Address, Length, NULL, &Remainder); 240 if (Remainder != 0) 241 { 242 return_ACPI_STATUS (AE_AML_ALIGNMENT); 243 } 244#endif 245 246 /* 247 * Does the request fit into the cached memory mapping? 248 * Is 1) Address below the current mapping? OR 249 * 2) Address beyond the current mapping? 250 */ 251 if (!Mm || (Address < Mm->PhysicalAddress) || 252 ((UINT64) Address + Length > (UINT64) Mm->PhysicalAddress + Mm->Length)) 253 { 254 /* 255 * The request cannot be resolved by the current memory mapping. 256 * 257 * Look for an existing saved mapping covering the address range 258 * at hand. If found, save it as the current one and carry out 259 * the access. 260 */ 261 for (Mm = MemInfo->FirstMm; Mm; Mm = Mm->NextMm) 262 { 263 if (Mm == MemInfo->CurMm) 264 { 265 continue; 266 } 267 268 if (Address < Mm->PhysicalAddress) 269 { 270 continue; 271 } 272 273 if ((UINT64) Address + Length > (UINT64) Mm->PhysicalAddress + Mm->Length) 274 { 275 continue; 276 } 277 278 MemInfo->CurMm = Mm; 279 goto access; 280 } 281 282 /* Create a new mappings list entry */ 283 284 Mm = ACPI_ALLOCATE_ZEROED(sizeof(*Mm)); 285 if (!Mm) 286 { 287 ACPI_ERROR((AE_INFO, 288 "Unable to save memory mapping at 0x%8.8X%8.8X, size %u", 289 ACPI_FORMAT_UINT64(Address), Length)); 290 return_ACPI_STATUS(AE_NO_MEMORY); 291 } 292 293 /* 294 * October 2009: Attempt to map from the requested address to the 295 * end of the region. However, we will never map more than one 296 * page, nor will we cross a page boundary. 297 */ 298 MapLength = (ACPI_SIZE) 299 ((MemInfo->Address + MemInfo->Length) - Address); 300 301 /* 302 * If mapping the entire remaining portion of the region will cross 303 * a page boundary, just map up to the page boundary, do not cross. 304 * On some systems, crossing a page boundary while mapping regions 305 * can cause warnings if the pages have different attributes 306 * due to resource management. 307 * 308 * This has the added benefit of constraining a single mapping to 309 * one page, which is similar to the original code that used a 4k 310 * maximum window. 311 */ 312 PageBoundaryMapLength = (ACPI_SIZE) 313 (ACPI_ROUND_UP (Address, ACPI_DEFAULT_PAGE_SIZE) - Address); 314 if (PageBoundaryMapLength == 0) 315 { 316 PageBoundaryMapLength = ACPI_DEFAULT_PAGE_SIZE; 317 } 318 319 if (MapLength > PageBoundaryMapLength) 320 { 321 MapLength = PageBoundaryMapLength; 322 } 323 324 /* Create a new mapping starting at the address given */ 325 326 LogicalAddrPtr = AcpiOsMapMemory(Address, MapLength); 327 if (!LogicalAddrPtr) 328 { 329 ACPI_ERROR ((AE_INFO, 330 "Could not map memory at 0x%8.8X%8.8X, size %u", 331 ACPI_FORMAT_UINT64 (Address), (UINT32) MapLength)); 332 ACPI_FREE(Mm); 333 return_ACPI_STATUS (AE_NO_MEMORY); 334 } 335 336 /* Save the physical address and mapping size */ 337 338 Mm->LogicalAddress = LogicalAddrPtr; 339 Mm->PhysicalAddress = Address; 340 Mm->Length = MapLength; 341 342 /* 343 * Add the new entry to the mappigs list and save it as the 344 * current mapping. 345 */ 346 Mm->NextMm = MemInfo->FirstMm; 347 MemInfo->FirstMm = Mm; 348 MemInfo->CurMm = Mm; 349 } 350 351access: 352 /* 353 * Generate a logical pointer corresponding to the address we want to 354 * access 355 */ 356 LogicalAddrPtr = Mm->LogicalAddress + 357 ((UINT64) Address - (UINT64) Mm->PhysicalAddress); 358 359 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 360 "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n", 361 BitWidth, Function, ACPI_FORMAT_UINT64 (Address))); 362 363 /* 364 * Perform the memory read or write 365 * 366 * Note: For machines that do not support non-aligned transfers, the target 367 * address was checked for alignment above. We do not attempt to break the 368 * transfer up into smaller (byte-size) chunks because the AML specifically 369 * asked for a transfer width that the hardware may require. 370 */ 371 switch (Function) 372 { 373 case ACPI_READ: 374 375 *Value = 0; 376 switch (BitWidth) 377 { 378 case 8: 379 380 *Value = (UINT64) ACPI_GET8 (LogicalAddrPtr); 381 break; 382 383 case 16: 384 385 *Value = (UINT64) ACPI_GET16 (LogicalAddrPtr); 386 break; 387 388 case 32: 389 390 *Value = (UINT64) ACPI_GET32 (LogicalAddrPtr); 391 break; 392 393 case 64: 394 395 *Value = (UINT64) ACPI_GET64 (LogicalAddrPtr); 396 break; 397 398 default: 399 400 /* BitWidth was already validated */ 401 402 break; 403 } 404 break; 405 406 case ACPI_WRITE: 407 408 switch (BitWidth) 409 { 410 case 8: 411 412 ACPI_SET8 (LogicalAddrPtr, *Value); 413 break; 414 415 case 16: 416 417 ACPI_SET16 (LogicalAddrPtr, *Value); 418 break; 419 420 case 32: 421 422 ACPI_SET32 (LogicalAddrPtr, *Value); 423 break; 424 425 case 64: 426 427 ACPI_SET64 (LogicalAddrPtr, *Value); 428 break; 429 430 default: 431 432 /* BitWidth was already validated */ 433 434 break; 435 } 436 break; 437 438 default: 439 440 Status = AE_BAD_PARAMETER; 441 break; 442 } 443 444 return_ACPI_STATUS (Status); 445} 446 447 448/******************************************************************************* 449 * 450 * FUNCTION: AcpiExSystemIoSpaceHandler 451 * 452 * PARAMETERS: Function - Read or Write operation 453 * Address - Where in the space to read or write 454 * BitWidth - Field width in bits (8, 16, or 32) 455 * Value - Pointer to in or out value 456 * HandlerContext - Pointer to Handler's context 457 * RegionContext - Pointer to context specific to the 458 * accessed region 459 * 460 * RETURN: Status 461 * 462 * DESCRIPTION: Handler for the System IO address space (Op Region) 463 * 464 ******************************************************************************/ 465 466ACPI_STATUS 467AcpiExSystemIoSpaceHandler ( 468 UINT32 Function, 469 ACPI_PHYSICAL_ADDRESS Address, 470 UINT32 BitWidth, 471 UINT64 *Value, 472 void *HandlerContext, 473 void *RegionContext) 474{ 475 ACPI_STATUS Status = AE_OK; 476 UINT32 Value32; 477 478 479 ACPI_FUNCTION_TRACE (ExSystemIoSpaceHandler); 480 481 482 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 483 "System-IO (width %u) R/W %u Address=%8.8X%8.8X\n", 484 BitWidth, Function, ACPI_FORMAT_UINT64 (Address))); 485 486 /* Decode the function parameter */ 487 488 switch (Function) 489 { 490 case ACPI_READ: 491 492 Status = AcpiHwReadPort ((ACPI_IO_ADDRESS) Address, 493 &Value32, BitWidth); 494 *Value = Value32; 495 break; 496 497 case ACPI_WRITE: 498 499 Status = AcpiHwWritePort ((ACPI_IO_ADDRESS) Address, 500 (UINT32) *Value, BitWidth); 501 break; 502 503 default: 504 505 Status = AE_BAD_PARAMETER; 506 break; 507 } 508 509 return_ACPI_STATUS (Status); 510} 511 512 513/******************************************************************************* 514 * 515 * FUNCTION: AcpiExPciConfigSpaceHandler 516 * 517 * PARAMETERS: Function - Read or Write operation 518 * Address - Where in the space to read or write 519 * BitWidth - Field width in bits (8, 16, or 32) 520 * Value - Pointer to in or out value 521 * HandlerContext - Pointer to Handler's context 522 * RegionContext - Pointer to context specific to the 523 * accessed region 524 * 525 * RETURN: Status 526 * 527 * DESCRIPTION: Handler for the PCI Config address space (Op Region) 528 * 529 ******************************************************************************/ 530 531ACPI_STATUS 532AcpiExPciConfigSpaceHandler ( 533 UINT32 Function, 534 ACPI_PHYSICAL_ADDRESS Address, 535 UINT32 BitWidth, 536 UINT64 *Value, 537 void *HandlerContext, 538 void *RegionContext) 539{ 540 ACPI_STATUS Status = AE_OK; 541 ACPI_PCI_ID *PciId; 542 UINT16 PciRegister; 543 544 545 ACPI_FUNCTION_TRACE (ExPciConfigSpaceHandler); 546 547 548 /* 549 * The arguments to AcpiOs(Read|Write)PciConfiguration are: 550 * 551 * PciSegment is the PCI bus segment range 0-31 552 * PciBus is the PCI bus number range 0-255 553 * PciDevice is the PCI device number range 0-31 554 * PciFunction is the PCI device function number 555 * PciRegister is the Config space register range 0-255 bytes 556 * 557 * Value - input value for write, output address for read 558 * 559 */ 560 PciId = (ACPI_PCI_ID *) RegionContext; 561 PciRegister = (UINT16) (UINT32) Address; 562 563 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 564 "Pci-Config %u (%u) Seg(%04x) Bus(%04x) " 565 "Dev(%04x) Func(%04x) Reg(%04x)\n", 566 Function, BitWidth, PciId->Segment, PciId->Bus, PciId->Device, 567 PciId->Function, PciRegister)); 568 569 switch (Function) 570 { 571 case ACPI_READ: 572 573 *Value = 0; 574 Status = AcpiOsReadPciConfiguration ( 575 PciId, PciRegister, Value, BitWidth); 576 break; 577 578 case ACPI_WRITE: 579 580 Status = AcpiOsWritePciConfiguration ( 581 PciId, PciRegister, *Value, BitWidth); 582 break; 583 584 default: 585 586 Status = AE_BAD_PARAMETER; 587 break; 588 } 589 590 return_ACPI_STATUS (Status); 591} 592 593 594/******************************************************************************* 595 * 596 * FUNCTION: AcpiExCmosSpaceHandler 597 * 598 * PARAMETERS: Function - Read or Write operation 599 * Address - Where in the space to read or write 600 * BitWidth - Field width in bits (8, 16, or 32) 601 * Value - Pointer to in or out value 602 * HandlerContext - Pointer to Handler's context 603 * RegionContext - Pointer to context specific to the 604 * accessed region 605 * 606 * RETURN: Status 607 * 608 * DESCRIPTION: Handler for the CMOS address space (Op Region) 609 * 610 ******************************************************************************/ 611 612ACPI_STATUS 613AcpiExCmosSpaceHandler ( 614 UINT32 Function, 615 ACPI_PHYSICAL_ADDRESS Address, 616 UINT32 BitWidth, 617 UINT64 *Value, 618 void *HandlerContext, 619 void *RegionContext) 620{ 621 ACPI_STATUS Status = AE_OK; 622 623 624 ACPI_FUNCTION_TRACE (ExCmosSpaceHandler); 625 626 627 return_ACPI_STATUS (Status); 628} 629 630 631/******************************************************************************* 632 * 633 * FUNCTION: AcpiExPciBarSpaceHandler 634 * 635 * PARAMETERS: Function - Read or Write operation 636 * Address - Where in the space to read or write 637 * BitWidth - Field width in bits (8, 16, or 32) 638 * Value - Pointer to in or out value 639 * HandlerContext - Pointer to Handler's context 640 * RegionContext - Pointer to context specific to the 641 * accessed region 642 * 643 * RETURN: Status 644 * 645 * DESCRIPTION: Handler for the PCI BarTarget address space (Op Region) 646 * 647 ******************************************************************************/ 648 649ACPI_STATUS 650AcpiExPciBarSpaceHandler ( 651 UINT32 Function, 652 ACPI_PHYSICAL_ADDRESS Address, 653 UINT32 BitWidth, 654 UINT64 *Value, 655 void *HandlerContext, 656 void *RegionContext) 657{ 658 ACPI_STATUS Status = AE_OK; 659 660 661 ACPI_FUNCTION_TRACE (ExPciBarSpaceHandler); 662 663 664 return_ACPI_STATUS (Status); 665} 666 667 668/******************************************************************************* 669 * 670 * FUNCTION: AcpiExDataTableSpaceHandler 671 * 672 * PARAMETERS: Function - Read or Write operation 673 * Address - Where in the space to read or write 674 * BitWidth - Field width in bits (8, 16, or 32) 675 * Value - Pointer to in or out value 676 * HandlerContext - Pointer to Handler's context 677 * RegionContext - Pointer to context specific to the 678 * accessed region 679 * 680 * RETURN: Status 681 * 682 * DESCRIPTION: Handler for the Data Table address space (Op Region) 683 * 684 ******************************************************************************/ 685 686ACPI_STATUS 687AcpiExDataTableSpaceHandler ( 688 UINT32 Function, 689 ACPI_PHYSICAL_ADDRESS Address, 690 UINT32 BitWidth, 691 UINT64 *Value, 692 void *HandlerContext, 693 void *RegionContext) 694{ 695 ACPI_DATA_TABLE_MAPPING *Mapping; 696 char *Pointer; 697 698 699 ACPI_FUNCTION_TRACE (ExDataTableSpaceHandler); 700 701 702 Mapping = (ACPI_DATA_TABLE_MAPPING *) RegionContext; 703 Pointer = ACPI_CAST_PTR (char, Mapping->Pointer) + 704 (Address - ACPI_PTR_TO_PHYSADDR (Mapping->Pointer)); 705 706 /* 707 * Perform the memory read or write. The BitWidth was already 708 * validated. 709 */ 710 switch (Function) 711 { 712 case ACPI_READ: 713 714 memcpy (ACPI_CAST_PTR (char, Value), Pointer, ACPI_DIV_8 (BitWidth)); 715 break; 716 717 case ACPI_WRITE: 718 719 memcpy (Pointer, ACPI_CAST_PTR (char, Value), ACPI_DIV_8 (BitWidth)); 720 break; 721 722 default: 723 724 return_ACPI_STATUS (AE_BAD_PARAMETER); 725 } 726 727 return_ACPI_STATUS (AE_OK); 728} 729