1 /******************************************************************************
3 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
6 *****************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999 - 2003, Intel Corp.
13 * All rights reserved.
17 * 2.1. This is your license from Intel Corp. under its intellectual property
18 * rights. You may have additional license terms from the party that provided
19 * you this software, covering your right to use that party's intellectual
22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
23 * copy of the source code appearing in this file ("Covered Code") an
24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
25 * base code distributed originally by Intel ("Original Intel Code") to copy,
26 * make derivatives, distribute, use and display any portion of the Covered
27 * Code in any form, with the right to sublicense such rights; and
29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
30 * license (with the right to sublicense), under only those claims of Intel
31 * patents that are infringed by the Original Intel Code, to make, use, sell,
32 * offer to sell, and import the Covered Code and derivative works thereof
33 * solely to the minimum extent necessary to exercise the above copyright
34 * license, and in no event shall the patent license extend to any additions
35 * to or modifications of the Original Intel Code. No other license or right
36 * is granted directly or by implication, estoppel or otherwise;
38 * The above copyright and patent license is granted only if the following
43 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
44 * Redistribution of source code of any substantial portion of the Covered
45 * Code or modification with rights to further distribute source must include
46 * the above Copyright Notice, the above License, this list of Conditions,
47 * and the following Disclaimer and Export Compliance provision. In addition,
48 * Licensee must cause all Covered Code to which Licensee contributes to
49 * contain a file documenting the changes Licensee made to create that Covered
50 * Code and the date of any change. Licensee must include in that file the
51 * documentation of any changes made by any predecessor Licensee. Licensee
52 * must include a prominent statement that the modification is derived,
53 * directly or indirectly, from Original Intel Code.
55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
56 * Redistribution of source code of any substantial portion of the Covered
57 * Code or modification without rights to further distribute source must
58 * include the following Disclaimer and Export Compliance provision in the
59 * documentation and/or other materials provided with distribution. In
60 * addition, Licensee may not authorize further sublicense of source of any
61 * portion of the Covered Code, and must include terms to the effect that the
62 * license from Licensee to its licensee is limited to the intellectual
63 * property embodied in the software Licensee provides to its licensee, and
64 * not to intellectual property embodied in modifications its licensee may
67 * 3.3. Redistribution of Executable. Redistribution in executable form of any
68 * substantial portion of the Covered Code or modification must reproduce the
69 * above Copyright Notice, and the following Disclaimer and Export Compliance
70 * provision in the documentation and/or other materials provided with the
73 * 3.4. Intel retains all right, title, and interest in and to the Original
76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77 * Intel shall be used in advertising or otherwise to promote the sale, use or
78 * other dealings in products derived from or relating to the Covered Code
79 * without prior written authorization from Intel.
81 * 4. Disclaimer and Export Compliance
83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
100 * 4.3. Licensee shall not export, either directly or indirectly, any of this
101 * software or system incorporating such software without first obtaining any
102 * required license or other approval from the U. S. Department of Commerce or
103 * any other agency or department of the United States Government. In the
104 * event Licensee exports any such software from the United States or
105 * re-exports any such software from a foreign destination, Licensee shall
106 * ensure that the distribution and export/re-export of the software is in
107 * compliance with all laws, regulations, orders, or other restrictions of the
108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109 * any of its subsidiaries will export/re-export any technical data, process,
110 * software, or service, directly or indirectly, to any country for which the
111 * United States government or any agency thereof requires an export license,
112 * other governmental approval, or letter of assurance, without first obtaining
113 * such license, approval or letter.
115 *****************************************************************************/
116 /* $DragonFly: src/sys/contrib/dev/acpica/Attic/exfield.c,v 1.1 2003/09/24 03:32:15 drhodus Exp $ */
119 #define __EXFIELD_C__
122 #include "acdispat.h"
123 #include "acinterp.h"
126 #define _COMPONENT ACPI_EXECUTER
127 ACPI_MODULE_NAME ("exfield")
130 /*******************************************************************************
132 * FUNCTION: AcpiExReadDataFromField
134 * PARAMETERS: WalkState - Current execution state
135 * ObjDesc - The named field
136 * RetBufferDesc - Where the return data object is stored
140 * DESCRIPTION: Read from a named field. Returns either an Integer or a
141 * Buffer, depending on the size of the field.
143 ******************************************************************************/
146 AcpiExReadDataFromField (
147 ACPI_WALK_STATE *WalkState,
148 ACPI_OPERAND_OBJECT *ObjDesc,
149 ACPI_OPERAND_OBJECT **RetBufferDesc)
152 ACPI_OPERAND_OBJECT *BufferDesc;
158 ACPI_FUNCTION_TRACE_PTR ("ExReadDataFromField", ObjDesc);
161 /* Parameter validation */
165 return_ACPI_STATUS (AE_AML_NO_OPERAND);
168 if (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_BUFFER_FIELD)
171 * If the BufferField arguments have not been previously evaluated,
172 * evaluate them now and save the results.
174 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
176 Status = AcpiDsGetBufferFieldArguments (ObjDesc);
177 if (ACPI_FAILURE (Status))
179 return_ACPI_STATUS (Status);
183 else if ((ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_REGION_FIELD) &&
184 (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS))
187 * This is an SMBus read. We must create a buffer to hold the data
188 * and directly access the region handler.
190 BufferDesc = AcpiUtCreateBufferObject (ACPI_SMBUS_BUFFER_SIZE);
193 return_ACPI_STATUS (AE_NO_MEMORY);
196 /* Lock entire transaction if requested */
198 Locked = AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
202 * Note: Smbus protocol value is passed in upper 16-bits of Function
204 Status = AcpiExAccessRegion (ObjDesc, 0,
205 ACPI_CAST_PTR (ACPI_INTEGER, BufferDesc->Buffer.Pointer),
206 ACPI_READ | (ObjDesc->Field.Attribute << 16));
207 AcpiExReleaseGlobalLock (Locked);
212 * Allocate a buffer for the contents of the field.
214 * If the field is larger than the size of an ACPI_INTEGER, create
215 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
216 * the use of arithmetic operators on the returned value if the
217 * field size is equal or smaller than an Integer.
219 * Note: Field.length is in bits.
221 Length = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->Field.BitLength);
222 if (Length > AcpiGbl_IntegerByteWidth)
224 /* Field is too large for an Integer, create a Buffer instead */
226 BufferDesc = AcpiUtCreateBufferObject (Length);
229 return_ACPI_STATUS (AE_NO_MEMORY);
231 Buffer = BufferDesc->Buffer.Pointer;
235 /* Field will fit within an Integer (normal case) */
237 BufferDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
240 return_ACPI_STATUS (AE_NO_MEMORY);
243 Length = AcpiGbl_IntegerByteWidth;
244 BufferDesc->Integer.Value = 0;
245 Buffer = &BufferDesc->Integer.Value;
248 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
249 "Obj=%p Type=%X Buf=%p Len=%X\n",
250 ObjDesc, ACPI_GET_OBJECT_TYPE (ObjDesc), Buffer, (UINT32) Length));
251 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
252 "FieldWrite: BitLen=%X BitOff=%X ByteOff=%X\n",
253 ObjDesc->CommonField.BitLength,
254 ObjDesc->CommonField.StartFieldBitOffset,
255 ObjDesc->CommonField.BaseByteOffset));
257 /* Lock entire transaction if requested */
259 Locked = AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
261 /* Read from the field */
263 Status = AcpiExExtractFromField (ObjDesc, Buffer, (UINT32) Length);
264 AcpiExReleaseGlobalLock (Locked);
268 if (ACPI_FAILURE (Status))
270 AcpiUtRemoveReference (BufferDesc);
272 else if (RetBufferDesc)
274 *RetBufferDesc = BufferDesc;
277 return_ACPI_STATUS (Status);
281 /*******************************************************************************
283 * FUNCTION: AcpiExWriteDataToField
285 * PARAMETERS: SourceDesc - Contains data to write
286 * ObjDesc - The named field
290 * DESCRIPTION: Write to a named field
292 ******************************************************************************/
295 AcpiExWriteDataToField (
296 ACPI_OPERAND_OBJECT *SourceDesc,
297 ACPI_OPERAND_OBJECT *ObjDesc,
298 ACPI_OPERAND_OBJECT **ResultDesc)
302 UINT32 RequiredLength;
306 ACPI_OPERAND_OBJECT *BufferDesc;
309 ACPI_FUNCTION_TRACE_PTR ("ExWriteDataToField", ObjDesc);
312 /* Parameter validation */
314 if (!SourceDesc || !ObjDesc)
316 return_ACPI_STATUS (AE_AML_NO_OPERAND);
319 if (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_BUFFER_FIELD)
322 * If the BufferField arguments have not been previously evaluated,
323 * evaluate them now and save the results.
325 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
327 Status = AcpiDsGetBufferFieldArguments (ObjDesc);
328 if (ACPI_FAILURE (Status))
330 return_ACPI_STATUS (Status);
334 else if ((ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_REGION_FIELD) &&
335 (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS))
338 * This is an SMBus write. We will bypass the entire field mechanism
339 * and handoff the buffer directly to the handler.
341 * Source must be a buffer of sufficient size (ACPI_SMBUS_BUFFER_SIZE).
343 if (ACPI_GET_OBJECT_TYPE (SourceDesc) != ACPI_TYPE_BUFFER)
345 ACPI_REPORT_ERROR (("SMBus write requires Buffer, found type %s\n",
346 AcpiUtGetObjectTypeName (SourceDesc)));
347 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
350 if (SourceDesc->Buffer.Length < ACPI_SMBUS_BUFFER_SIZE)
352 ACPI_REPORT_ERROR (("SMBus write requires Buffer of length %X, found length %X\n",
353 ACPI_SMBUS_BUFFER_SIZE, SourceDesc->Buffer.Length));
354 return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
357 BufferDesc = AcpiUtCreateBufferObject (ACPI_SMBUS_BUFFER_SIZE);
360 return_ACPI_STATUS (AE_NO_MEMORY);
363 Buffer = BufferDesc->Buffer.Pointer;
364 ACPI_MEMCPY (Buffer, SourceDesc->Buffer.Pointer, ACPI_SMBUS_BUFFER_SIZE);
366 /* Lock entire transaction if requested */
368 Locked = AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
371 * Perform the write (returns status and perhaps data in the same buffer)
372 * Note: SMBus protocol type is passed in upper 16-bits of Function.
374 Status = AcpiExAccessRegion (ObjDesc, 0,
375 (ACPI_INTEGER *) Buffer,
376 ACPI_WRITE | (ObjDesc->Field.Attribute << 16));
377 AcpiExReleaseGlobalLock (Locked);
379 *ResultDesc = BufferDesc;
380 return_ACPI_STATUS (Status);
384 * Get a pointer to the data to be written
386 switch (ACPI_GET_OBJECT_TYPE (SourceDesc))
388 case ACPI_TYPE_INTEGER:
389 Buffer = &SourceDesc->Integer.Value;
390 Length = sizeof (SourceDesc->Integer.Value);
393 case ACPI_TYPE_BUFFER:
394 Buffer = SourceDesc->Buffer.Pointer;
395 Length = SourceDesc->Buffer.Length;
398 case ACPI_TYPE_STRING:
399 Buffer = SourceDesc->String.Pointer;
400 Length = SourceDesc->String.Length;
404 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
408 * We must have a buffer that is at least as long as the field
409 * we are writing to. This is because individual fields are
410 * indivisible and partial writes are not supported -- as per
411 * the ACPI specification.
414 RequiredLength = ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength);
416 if (Length < RequiredLength)
418 /* We need to create a new buffer */
420 NewBuffer = ACPI_MEM_CALLOCATE (RequiredLength);
423 return_ACPI_STATUS (AE_NO_MEMORY);
427 * Copy the original data to the new buffer, starting
428 * at Byte zero. All unused (upper) bytes of the
431 ACPI_MEMCPY ((char *) NewBuffer, (char *) Buffer, Length);
433 Length = RequiredLength;
436 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
437 "Obj=%p Type=%X Buf=%p Len=%X\n",
438 ObjDesc, ACPI_GET_OBJECT_TYPE (ObjDesc), Buffer, Length));
439 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
440 "FieldRead: BitLen=%X BitOff=%X ByteOff=%X\n",
441 ObjDesc->CommonField.BitLength,
442 ObjDesc->CommonField.StartFieldBitOffset,
443 ObjDesc->CommonField.BaseByteOffset));
445 /* Lock entire transaction if requested */
447 Locked = AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
449 /* Write to the field */
451 Status = AcpiExInsertIntoField (ObjDesc, Buffer, Length);
452 AcpiExReleaseGlobalLock (Locked);
454 /* Free temporary buffer if we used one */
458 ACPI_MEM_FREE (NewBuffer);
461 return_ACPI_STATUS (Status);