1 /******************************************************************************
2 *
3 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44
45 #define __EXFIELD_C__
46
47 #include "acpi.h"
48 #include "accommon.h"
49 #include "acdispat.h"
50 #include "acinterp.h"
51
52
53 #define _COMPONENT ACPI_EXECUTER
54 ACPI_MODULE_NAME ("exfield")
55
56
57 /*******************************************************************************
58 *
59 * FUNCTION: AcpiExReadDataFromField
60 *
61 * PARAMETERS: WalkState - Current execution state
62 * ObjDesc - The named field
63 * RetBufferDesc - Where the return data object is stored
64 *
65 * RETURN: Status
66 *
67 * DESCRIPTION: Read from a named field. Returns either an Integer or a
68 * Buffer, depending on the size of the field.
69 *
70 ******************************************************************************/
71
72 ACPI_STATUS
73 AcpiExReadDataFromField (
74 ACPI_WALK_STATE *WalkState,
75 ACPI_OPERAND_OBJECT *ObjDesc,
76 ACPI_OPERAND_OBJECT **RetBufferDesc)
77 {
78 ACPI_STATUS Status;
79 ACPI_OPERAND_OBJECT *BufferDesc;
80 ACPI_SIZE Length;
81 void *Buffer;
82 UINT32 Function;
83
84
85 ACPI_FUNCTION_TRACE_PTR (ExReadDataFromField, ObjDesc);
86
87
88 /* Parameter validation */
89
90 if (!ObjDesc)
91 {
92 return_ACPI_STATUS (AE_AML_NO_OPERAND);
93 }
94 if (!RetBufferDesc)
95 {
96 return_ACPI_STATUS (AE_BAD_PARAMETER);
97 }
98
99 if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
100 {
101 /*
102 * If the BufferField arguments have not been previously evaluated,
103 * evaluate them now and save the results.
104 */
105 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
106 {
107 Status = AcpiDsGetBufferFieldArguments (ObjDesc);
108 if (ACPI_FAILURE (Status))
109 {
110 return_ACPI_STATUS (Status);
111 }
112 }
113 }
114 else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
115 (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
116 ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
117 ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
118 {
119 /*
120 * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
121 * the data and then directly access the region handler.
122 *
123 * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
124 */
125 if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
126 {
127 Length = ACPI_SMBUS_BUFFER_SIZE;
128 Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
129 }
130 else if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS)
131 {
132 Length = ACPI_GSBUS_BUFFER_SIZE;
133 Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
134 }
135 else /* IPMI */
136 {
137 Length = ACPI_IPMI_BUFFER_SIZE;
138 Function = ACPI_READ;
139 }
140
141 BufferDesc = AcpiUtCreateBufferObject (Length);
142 if (!BufferDesc)
143 {
144 return_ACPI_STATUS (AE_NO_MEMORY);
145 }
146
147 /* Lock entire transaction if requested */
148
149 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
150
151 /* Call the region handler for the read */
152
153 Status = AcpiExAccessRegion (ObjDesc, 0,
154 ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer),
155 Function);
156 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
157 goto Exit;
158 }
159
160 /*
161 * Allocate a buffer for the contents of the field.
162 *
163 * If the field is larger than the current integer width, create
164 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
165 * the use of arithmetic operators on the returned value if the
166 * field size is equal or smaller than an Integer.
167 *
168 * Note: Field.length is in bits.
169 */
170 Length = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->Field.BitLength);
171 if (Length > AcpiGbl_IntegerByteWidth)
172 {
173 /* Field is too large for an Integer, create a Buffer instead */
174
175 BufferDesc = AcpiUtCreateBufferObject (Length);
176 if (!BufferDesc)
177 {
178 return_ACPI_STATUS (AE_NO_MEMORY);
179 }
180 Buffer = BufferDesc->Buffer.Pointer;
181 }
182 else
183 {
184 /* Field will fit within an Integer (normal case) */
185
186 BufferDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
187 if (!BufferDesc)
188 {
189 return_ACPI_STATUS (AE_NO_MEMORY);
190 }
191
192 Length = AcpiGbl_IntegerByteWidth;
193 Buffer = &BufferDesc->Integer.Value;
194 }
195
196 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
197 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
198 ObjDesc, ObjDesc->Common.Type, Buffer, (UINT32) Length));
199 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
200 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
201 ObjDesc->CommonField.BitLength,
202 ObjDesc->CommonField.StartFieldBitOffset,
203 ObjDesc->CommonField.BaseByteOffset));
204
205 /* Lock entire transaction if requested */
206
207 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
208
209 /* Read from the field */
210
211 Status = AcpiExExtractFromField (ObjDesc, Buffer, (UINT32) Length);
212 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
213
214
215 Exit:
216 if (ACPI_FAILURE (Status))
217 {
218 AcpiUtRemoveReference (BufferDesc);
219 }
220 else
221 {
222 *RetBufferDesc = BufferDesc;
223 }
224
225 return_ACPI_STATUS (Status);
226 }
227
228
229 /*******************************************************************************
230 *
231 * FUNCTION: AcpiExWriteDataToField
232 *
233 * PARAMETERS: SourceDesc - Contains data to write
234 * ObjDesc - The named field
235 * ResultDesc - Where the return value is returned, if any
236 *
237 * RETURN: Status
238 *
239 * DESCRIPTION: Write to a named field
240 *
241 ******************************************************************************/
242
243 ACPI_STATUS
244 AcpiExWriteDataToField (
245 ACPI_OPERAND_OBJECT *SourceDesc,
246 ACPI_OPERAND_OBJECT *ObjDesc,
247 ACPI_OPERAND_OBJECT **ResultDesc)
248 {
249 ACPI_STATUS Status;
250 UINT32 Length;
251 void *Buffer;
252 ACPI_OPERAND_OBJECT *BufferDesc;
253 UINT32 Function;
254
255
256 ACPI_FUNCTION_TRACE_PTR (ExWriteDataToField, ObjDesc);
257
258
259 /* Parameter validation */
260
261 if (!SourceDesc || !ObjDesc)
262 {
263 return_ACPI_STATUS (AE_AML_NO_OPERAND);
264 }
265
266 if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
267 {
268 /*
269 * If the BufferField arguments have not been previously evaluated,
270 * evaluate them now and save the results.
271 */
272 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
273 {
274 Status = AcpiDsGetBufferFieldArguments (ObjDesc);
275 if (ACPI_FAILURE (Status))
276 {
277 return_ACPI_STATUS (Status);
278 }
279 }
280 }
281 else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
282 (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
283 ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
284 ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
285 {
286 /*
287 * This is an SMBus, GSBus or IPMI write. We will bypass the entire field
288 * mechanism and handoff the buffer directly to the handler. For
289 * these address spaces, the buffer is bi-directional; on a write,
290 * return data is returned in the same buffer.
291 *
292 * Source must be a buffer of sufficient size:
293 * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
294 *
295 * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
296 */
297 if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
298 {
299 ACPI_ERROR ((AE_INFO,
300 "SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
301 AcpiUtGetObjectTypeName (SourceDesc)));
302
303 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
304 }
305
306 if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
307 {
308 Length = ACPI_SMBUS_BUFFER_SIZE;
309 Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
310 }
311 else if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS)
312 {
313 Length = ACPI_GSBUS_BUFFER_SIZE;
314 Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
315 }
316 else /* IPMI */
317 {
318 Length = ACPI_IPMI_BUFFER_SIZE;
319 Function = ACPI_WRITE;
320 }
321
322 if (SourceDesc->Buffer.Length < Length)
323 {
324 ACPI_ERROR ((AE_INFO,
325 "SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
326 Length, SourceDesc->Buffer.Length));
327
328 return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
329 }
330
331 /* Create the bi-directional buffer */
332
333 BufferDesc = AcpiUtCreateBufferObject (Length);
334 if (!BufferDesc)
335 {
336 return_ACPI_STATUS (AE_NO_MEMORY);
337 }
338
339 Buffer = BufferDesc->Buffer.Pointer;
340 ACPI_MEMCPY (Buffer, SourceDesc->Buffer.Pointer, Length);
341
342 /* Lock entire transaction if requested */
343
344 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
345
346 /*
347 * Perform the write (returns status and perhaps data in the
348 * same buffer)
349 */
350 Status = AcpiExAccessRegion (ObjDesc, 0,
351 (UINT64 *) Buffer, Function);
352 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
353
354 *ResultDesc = BufferDesc;
355 return_ACPI_STATUS (Status);
356 }
357
358 /* Get a pointer to the data to be written */
359
360 switch (SourceDesc->Common.Type)
361 {
362 case ACPI_TYPE_INTEGER:
363
364 Buffer = &SourceDesc->Integer.Value;
365 Length = sizeof (SourceDesc->Integer.Value);
366 break;
367
368 case ACPI_TYPE_BUFFER:
369
370 Buffer = SourceDesc->Buffer.Pointer;
371 Length = SourceDesc->Buffer.Length;
372 break;
373
374 case ACPI_TYPE_STRING:
375
376 Buffer = SourceDesc->String.Pointer;
377 Length = SourceDesc->String.Length;
378 break;
379
380 default:
381
382 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
383 }
384
385 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
386 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
387 SourceDesc, AcpiUtGetTypeName (SourceDesc->Common.Type),
388 SourceDesc->Common.Type, Buffer, Length));
389
390 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
391 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
392 ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type),
393 ObjDesc->Common.Type,
394 ObjDesc->CommonField.BitLength,
395 ObjDesc->CommonField.StartFieldBitOffset,
396 ObjDesc->CommonField.BaseByteOffset));
397
398 /* Lock entire transaction if requested */
399
400 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
401
402 /* Write to the field */
403
404 Status = AcpiExInsertIntoField (ObjDesc, Buffer, Length);
405 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
406
407 return_ACPI_STATUS (Status);
408 }