xref: /freebsd/sys/contrib/dev/acpica/components/executer/exregion.c (revision 2f9966ff63d65bd474478888c9088eeae3f9c669)
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 <contrib/dev/acpica/include/acpi.h>
153 #include <contrib/dev/acpica/include/accommon.h>
154 #include <contrib/dev/acpica/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 
179 ACPI_STATUS
180 AcpiExSystemMemorySpaceHandler (
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 
351 access:
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 
466 ACPI_STATUS
467 AcpiExSystemIoSpaceHandler (
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 
531 ACPI_STATUS
532 AcpiExPciConfigSpaceHandler (
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 
612 ACPI_STATUS
613 AcpiExCmosSpaceHandler (
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 
649 ACPI_STATUS
650 AcpiExPciBarSpaceHandler (
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 
686 ACPI_STATUS
687 AcpiExDataTableSpaceHandler (
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