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 - 2018, 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 
179 ACPI_STATUS
AcpiExSystemMemorySpaceHandler(UINT32 Function,ACPI_PHYSICAL_ADDRESS Address,UINT32 BitWidth,UINT64 * Value,void * HandlerContext,void * RegionContext)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     UINT32                  Length;
192     ACPI_SIZE               MapLength;
193     ACPI_SIZE               PageBoundaryMapLength;
194 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
195     UINT32                  Remainder;
196 #endif
197 
198 
199     ACPI_FUNCTION_TRACE (ExSystemMemorySpaceHandler);
200 
201 
202     /* Validate and translate the bit width */
203 
204     switch (BitWidth)
205     {
206     case 8:
207 
208         Length = 1;
209         break;
210 
211     case 16:
212 
213         Length = 2;
214         break;
215 
216     case 32:
217 
218         Length = 4;
219         break;
220 
221     case 64:
222 
223         Length = 8;
224         break;
225 
226     default:
227 
228         ACPI_ERROR ((AE_INFO, "Invalid SystemMemory width %u",
229             BitWidth));
230         return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
231     }
232 
233 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
234     /*
235      * Hardware does not support non-aligned data transfers, we must verify
236      * the request.
237      */
238     (void) AcpiUtShortDivide ((UINT64) Address, Length, NULL, &Remainder);
239     if (Remainder != 0)
240     {
241         return_ACPI_STATUS (AE_AML_ALIGNMENT);
242     }
243 #endif
244 
245     /*
246      * Does the request fit into the cached memory mapping?
247      * Is 1) Address below the current mapping? OR
248      *    2) Address beyond the current mapping?
249      */
250     if ((Address < MemInfo->MappedPhysicalAddress) ||
251         (((UINT64) Address + Length) >
252             ((UINT64)
253             MemInfo->MappedPhysicalAddress + MemInfo->MappedLength)))
254     {
255         /*
256          * The request cannot be resolved by the current memory mapping;
257          * Delete the existing mapping and create a new one.
258          */
259         if (MemInfo->MappedLength)
260         {
261             /* Valid mapping, delete it */
262 
263             AcpiOsUnmapMemory (MemInfo->MappedLogicalAddress,
264                 MemInfo->MappedLength);
265         }
266 
267         /*
268          * October 2009: Attempt to map from the requested address to the
269          * end of the region. However, we will never map more than one
270          * page, nor will we cross a page boundary.
271          */
272         MapLength = (ACPI_SIZE)
273             ((MemInfo->Address + MemInfo->Length) - Address);
274 
275         /*
276          * If mapping the entire remaining portion of the region will cross
277          * a page boundary, just map up to the page boundary, do not cross.
278          * On some systems, crossing a page boundary while mapping regions
279          * can cause warnings if the pages have different attributes
280          * due to resource management.
281          *
282          * This has the added benefit of constraining a single mapping to
283          * one page, which is similar to the original code that used a 4k
284          * maximum window.
285          */
286         PageBoundaryMapLength = (ACPI_SIZE)
287             (ACPI_ROUND_UP (Address, ACPI_DEFAULT_PAGE_SIZE) - Address);
288         if (PageBoundaryMapLength == 0)
289         {
290             PageBoundaryMapLength = ACPI_DEFAULT_PAGE_SIZE;
291         }
292 
293         if (MapLength > PageBoundaryMapLength)
294         {
295             MapLength = PageBoundaryMapLength;
296         }
297 
298         /* Create a new mapping starting at the address given */
299 
300         MemInfo->MappedLogicalAddress = AcpiOsMapMemory (Address, MapLength);
301         if (!MemInfo->MappedLogicalAddress)
302         {
303             ACPI_ERROR ((AE_INFO,
304                 "Could not map memory at 0x%8.8X%8.8X, size %u",
305                 ACPI_FORMAT_UINT64 (Address), (UINT32) MapLength));
306             MemInfo->MappedLength = 0;
307             return_ACPI_STATUS (AE_NO_MEMORY);
308         }
309 
310         /* Save the physical address and mapping size */
311 
312         MemInfo->MappedPhysicalAddress = Address;
313         MemInfo->MappedLength = MapLength;
314     }
315 
316     /*
317      * Generate a logical pointer corresponding to the address we want to
318      * access
319      */
320     LogicalAddrPtr = MemInfo->MappedLogicalAddress +
321         ((UINT64) Address - (UINT64) MemInfo->MappedPhysicalAddress);
322 
323     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
324         "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n",
325         BitWidth, Function, ACPI_FORMAT_UINT64 (Address)));
326 
327     /*
328      * Perform the memory read or write
329      *
330      * Note: For machines that do not support non-aligned transfers, the target
331      * address was checked for alignment above. We do not attempt to break the
332      * transfer up into smaller (byte-size) chunks because the AML specifically
333      * asked for a transfer width that the hardware may require.
334      */
335     switch (Function)
336     {
337     case ACPI_READ:
338 
339         *Value = 0;
340         switch (BitWidth)
341         {
342         case 8:
343 
344             *Value = (UINT64) ACPI_GET8 (LogicalAddrPtr);
345             break;
346 
347         case 16:
348 
349             *Value = (UINT64) ACPI_GET16 (LogicalAddrPtr);
350             break;
351 
352         case 32:
353 
354             *Value = (UINT64) ACPI_GET32 (LogicalAddrPtr);
355             break;
356 
357         case 64:
358 
359             *Value = (UINT64) ACPI_GET64 (LogicalAddrPtr);
360             break;
361 
362         default:
363 
364             /* BitWidth was already validated */
365 
366             break;
367         }
368         break;
369 
370     case ACPI_WRITE:
371 
372         switch (BitWidth)
373         {
374         case 8:
375 
376             ACPI_SET8 (LogicalAddrPtr, *Value);
377             break;
378 
379         case 16:
380 
381             ACPI_SET16 (LogicalAddrPtr, *Value);
382             break;
383 
384         case 32:
385 
386             ACPI_SET32 (LogicalAddrPtr, *Value);
387             break;
388 
389         case 64:
390 
391             ACPI_SET64 (LogicalAddrPtr, *Value);
392             break;
393 
394         default:
395 
396             /* BitWidth was already validated */
397 
398             break;
399         }
400         break;
401 
402     default:
403 
404         Status = AE_BAD_PARAMETER;
405         break;
406     }
407 
408     return_ACPI_STATUS (Status);
409 }
410 
411 
412 /*******************************************************************************
413  *
414  * FUNCTION:    AcpiExSystemIoSpaceHandler
415  *
416  * PARAMETERS:  Function            - Read or Write operation
417  *              Address             - Where in the space to read or write
418  *              BitWidth            - Field width in bits (8, 16, or 32)
419  *              Value               - Pointer to in or out value
420  *              HandlerContext      - Pointer to Handler's context
421  *              RegionContext       - Pointer to context specific to the
422  *                                    accessed region
423  *
424  * RETURN:      Status
425  *
426  * DESCRIPTION: Handler for the System IO address space (Op Region)
427  *
428  ******************************************************************************/
429 
430 ACPI_STATUS
AcpiExSystemIoSpaceHandler(UINT32 Function,ACPI_PHYSICAL_ADDRESS Address,UINT32 BitWidth,UINT64 * Value,void * HandlerContext,void * RegionContext)431 AcpiExSystemIoSpaceHandler (
432     UINT32                  Function,
433     ACPI_PHYSICAL_ADDRESS   Address,
434     UINT32                  BitWidth,
435     UINT64                  *Value,
436     void                    *HandlerContext,
437     void                    *RegionContext)
438 {
439     ACPI_STATUS             Status = AE_OK;
440     UINT32                  Value32;
441 
442 
443     ACPI_FUNCTION_TRACE (ExSystemIoSpaceHandler);
444 
445 
446     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
447         "System-IO (width %u) R/W %u Address=%8.8X%8.8X\n",
448         BitWidth, Function, ACPI_FORMAT_UINT64 (Address)));
449 
450     /* Decode the function parameter */
451 
452     switch (Function)
453     {
454     case ACPI_READ:
455 
456         Status = AcpiHwReadPort ((ACPI_IO_ADDRESS) Address,
457                     &Value32, BitWidth);
458         *Value = Value32;
459         break;
460 
461     case ACPI_WRITE:
462 
463         Status = AcpiHwWritePort ((ACPI_IO_ADDRESS) Address,
464                     (UINT32) *Value, BitWidth);
465         break;
466 
467     default:
468 
469         Status = AE_BAD_PARAMETER;
470         break;
471     }
472 
473     return_ACPI_STATUS (Status);
474 }
475 
476 
477 /*******************************************************************************
478  *
479  * FUNCTION:    AcpiExPciConfigSpaceHandler
480  *
481  * PARAMETERS:  Function            - Read or Write operation
482  *              Address             - Where in the space to read or write
483  *              BitWidth            - Field width in bits (8, 16, or 32)
484  *              Value               - Pointer to in or out value
485  *              HandlerContext      - Pointer to Handler's context
486  *              RegionContext       - Pointer to context specific to the
487  *                                    accessed region
488  *
489  * RETURN:      Status
490  *
491  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
492  *
493  ******************************************************************************/
494 
495 ACPI_STATUS
AcpiExPciConfigSpaceHandler(UINT32 Function,ACPI_PHYSICAL_ADDRESS Address,UINT32 BitWidth,UINT64 * Value,void * HandlerContext,void * RegionContext)496 AcpiExPciConfigSpaceHandler (
497     UINT32                  Function,
498     ACPI_PHYSICAL_ADDRESS   Address,
499     UINT32                  BitWidth,
500     UINT64                  *Value,
501     void                    *HandlerContext,
502     void                    *RegionContext)
503 {
504     ACPI_STATUS             Status = AE_OK;
505     ACPI_PCI_ID             *PciId;
506     UINT16                  PciRegister;
507 
508 
509     ACPI_FUNCTION_TRACE (ExPciConfigSpaceHandler);
510 
511 
512     /*
513      *  The arguments to AcpiOs(Read|Write)PciConfiguration are:
514      *
515      *  PciSegment  is the PCI bus segment range 0-31
516      *  PciBus      is the PCI bus number range 0-255
517      *  PciDevice   is the PCI device number range 0-31
518      *  PciFunction is the PCI device function number
519      *  PciRegister is the Config space register range 0-255 bytes
520      *
521      *  Value - input value for write, output address for read
522      *
523      */
524     PciId       = (ACPI_PCI_ID *) RegionContext;
525     PciRegister = (UINT16) (UINT32) Address;
526 
527     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
528         "Pci-Config %u (%u) Seg(%04x) Bus(%04x) "
529         "Dev(%04x) Func(%04x) Reg(%04x)\n",
530         Function, BitWidth, PciId->Segment, PciId->Bus, PciId->Device,
531         PciId->Function, PciRegister));
532 
533     switch (Function)
534     {
535     case ACPI_READ:
536 
537         *Value = 0;
538         Status = AcpiOsReadPciConfiguration (
539             PciId, PciRegister, Value, BitWidth);
540         break;
541 
542     case ACPI_WRITE:
543 
544         Status = AcpiOsWritePciConfiguration (
545             PciId, PciRegister, *Value, BitWidth);
546         break;
547 
548     default:
549 
550         Status = AE_BAD_PARAMETER;
551         break;
552     }
553 
554     return_ACPI_STATUS (Status);
555 }
556 
557 
558 /*******************************************************************************
559  *
560  * FUNCTION:    AcpiExCmosSpaceHandler
561  *
562  * PARAMETERS:  Function            - Read or Write operation
563  *              Address             - Where in the space to read or write
564  *              BitWidth            - Field width in bits (8, 16, or 32)
565  *              Value               - Pointer to in or out value
566  *              HandlerContext      - Pointer to Handler's context
567  *              RegionContext       - Pointer to context specific to the
568  *                                    accessed region
569  *
570  * RETURN:      Status
571  *
572  * DESCRIPTION: Handler for the CMOS address space (Op Region)
573  *
574  ******************************************************************************/
575 
576 ACPI_STATUS
AcpiExCmosSpaceHandler(UINT32 Function,ACPI_PHYSICAL_ADDRESS Address,UINT32 BitWidth,UINT64 * Value,void * HandlerContext,void * RegionContext)577 AcpiExCmosSpaceHandler (
578     UINT32                  Function,
579     ACPI_PHYSICAL_ADDRESS   Address,
580     UINT32                  BitWidth,
581     UINT64                  *Value,
582     void                    *HandlerContext,
583     void                    *RegionContext)
584 {
585     ACPI_STATUS             Status = AE_OK;
586 
587 
588     ACPI_FUNCTION_TRACE (ExCmosSpaceHandler);
589 
590 
591     return_ACPI_STATUS (Status);
592 }
593 
594 
595 /*******************************************************************************
596  *
597  * FUNCTION:    AcpiExPciBarSpaceHandler
598  *
599  * PARAMETERS:  Function            - Read or Write operation
600  *              Address             - Where in the space to read or write
601  *              BitWidth            - Field width in bits (8, 16, or 32)
602  *              Value               - Pointer to in or out value
603  *              HandlerContext      - Pointer to Handler's context
604  *              RegionContext       - Pointer to context specific to the
605  *                                    accessed region
606  *
607  * RETURN:      Status
608  *
609  * DESCRIPTION: Handler for the PCI BarTarget address space (Op Region)
610  *
611  ******************************************************************************/
612 
613 ACPI_STATUS
AcpiExPciBarSpaceHandler(UINT32 Function,ACPI_PHYSICAL_ADDRESS Address,UINT32 BitWidth,UINT64 * Value,void * HandlerContext,void * RegionContext)614 AcpiExPciBarSpaceHandler (
615     UINT32                  Function,
616     ACPI_PHYSICAL_ADDRESS   Address,
617     UINT32                  BitWidth,
618     UINT64                  *Value,
619     void                    *HandlerContext,
620     void                    *RegionContext)
621 {
622     ACPI_STATUS             Status = AE_OK;
623 
624 
625     ACPI_FUNCTION_TRACE (ExPciBarSpaceHandler);
626 
627 
628     return_ACPI_STATUS (Status);
629 }
630 
631 
632 /*******************************************************************************
633  *
634  * FUNCTION:    AcpiExDataTableSpaceHandler
635  *
636  * PARAMETERS:  Function            - Read or Write operation
637  *              Address             - Where in the space to read or write
638  *              BitWidth            - Field width in bits (8, 16, or 32)
639  *              Value               - Pointer to in or out value
640  *              HandlerContext      - Pointer to Handler's context
641  *              RegionContext       - Pointer to context specific to the
642  *                                    accessed region
643  *
644  * RETURN:      Status
645  *
646  * DESCRIPTION: Handler for the Data Table address space (Op Region)
647  *
648  ******************************************************************************/
649 
650 ACPI_STATUS
AcpiExDataTableSpaceHandler(UINT32 Function,ACPI_PHYSICAL_ADDRESS Address,UINT32 BitWidth,UINT64 * Value,void * HandlerContext,void * RegionContext)651 AcpiExDataTableSpaceHandler (
652     UINT32                  Function,
653     ACPI_PHYSICAL_ADDRESS   Address,
654     UINT32                  BitWidth,
655     UINT64                  *Value,
656     void                    *HandlerContext,
657     void                    *RegionContext)
658 {
659     ACPI_FUNCTION_TRACE (ExDataTableSpaceHandler);
660 
661 
662     /*
663      * Perform the memory read or write. The BitWidth was already
664      * validated.
665      */
666     switch (Function)
667     {
668     case ACPI_READ:
669 
670         memcpy (ACPI_CAST_PTR (char, Value), ACPI_PHYSADDR_TO_PTR (Address),
671             ACPI_DIV_8 (BitWidth));
672         break;
673 
674     case ACPI_WRITE:
675 
676         memcpy (ACPI_PHYSADDR_TO_PTR (Address), ACPI_CAST_PTR (char, Value),
677             ACPI_DIV_8 (BitWidth));
678         break;
679 
680     default:
681 
682         return_ACPI_STATUS (AE_BAD_PARAMETER);
683     }
684 
685     return_ACPI_STATUS (AE_OK);
686 }
687