1 /*******************************************************************************
2 *
3 * Module Name: utmisc - common utility procedures
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, 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 __UTMISC_C__
46
47 #include "acpi.h"
48 #include "accommon.h"
49 #include "acnamesp.h"
50
51
52 #define _COMPONENT ACPI_UTILITIES
53 ACPI_MODULE_NAME ("utmisc")
54
55
56 /*******************************************************************************
57 *
58 * FUNCTION: AcpiUtIsPciRootBridge
59 *
60 * PARAMETERS: Id - The HID/CID in string format
61 *
62 * RETURN: TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
63 *
64 * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
65 *
66 ******************************************************************************/
67
68 BOOLEAN
69 AcpiUtIsPciRootBridge (
70 char *Id)
71 {
72
73 /*
74 * Check if this is a PCI root bridge.
75 * ACPI 3.0+: check for a PCI Express root also.
76 */
77 if (!(ACPI_STRCMP (Id,
78 PCI_ROOT_HID_STRING)) ||
79
80 !(ACPI_STRCMP (Id,
81 PCI_EXPRESS_ROOT_HID_STRING)))
82 {
83 return (TRUE);
84 }
85
86 return (FALSE);
87 }
88
89
90 /*******************************************************************************
91 *
92 * FUNCTION: AcpiUtIsAmlTable
93 *
94 * PARAMETERS: Table - An ACPI table
95 *
96 * RETURN: TRUE if table contains executable AML; FALSE otherwise
97 *
98 * DESCRIPTION: Check ACPI Signature for a table that contains AML code.
99 * Currently, these are DSDT,SSDT,PSDT. All other table types are
100 * data tables that do not contain AML code.
101 *
102 ******************************************************************************/
103
104 BOOLEAN
105 AcpiUtIsAmlTable (
106 ACPI_TABLE_HEADER *Table)
107 {
108
109 /* These are the only tables that contain executable AML */
110
111 if (ACPI_COMPARE_NAME (Table->Signature, ACPI_SIG_DSDT) ||
112 ACPI_COMPARE_NAME (Table->Signature, ACPI_SIG_PSDT) ||
113 ACPI_COMPARE_NAME (Table->Signature, ACPI_SIG_SSDT))
114 {
115 return (TRUE);
116 }
117
118 return (FALSE);
119 }
120
121
122 /*******************************************************************************
123 *
124 * FUNCTION: AcpiUtDwordByteSwap
125 *
126 * PARAMETERS: Value - Value to be converted
127 *
128 * RETURN: UINT32 integer with bytes swapped
129 *
130 * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
131 *
132 ******************************************************************************/
133
134 UINT32
135 AcpiUtDwordByteSwap (
136 UINT32 Value)
137 {
138 union
139 {
140 UINT32 Value;
141 UINT8 Bytes[4];
142 } Out;
143 union
144 {
145 UINT32 Value;
146 UINT8 Bytes[4];
147 } In;
148
149
150 ACPI_FUNCTION_ENTRY ();
151
152
153 In.Value = Value;
154
155 Out.Bytes[0] = In.Bytes[3];
156 Out.Bytes[1] = In.Bytes[2];
157 Out.Bytes[2] = In.Bytes[1];
158 Out.Bytes[3] = In.Bytes[0];
159
160 return (Out.Value);
161 }
162
163
164 /*******************************************************************************
165 *
166 * FUNCTION: AcpiUtSetIntegerWidth
167 *
168 * PARAMETERS: Revision From DSDT header
169 *
170 * RETURN: None
171 *
172 * DESCRIPTION: Set the global integer bit width based upon the revision
173 * of the DSDT. For Revision 1 and 0, Integers are 32 bits.
174 * For Revision 2 and above, Integers are 64 bits. Yes, this
175 * makes a difference.
176 *
177 ******************************************************************************/
178
179 void
180 AcpiUtSetIntegerWidth (
181 UINT8 Revision)
182 {
183
184 if (Revision < 2)
185 {
186 /* 32-bit case */
187
188 AcpiGbl_IntegerBitWidth = 32;
189 AcpiGbl_IntegerNybbleWidth = 8;
190 AcpiGbl_IntegerByteWidth = 4;
191 }
192 else
193 {
194 /* 64-bit case (ACPI 2.0+) */
195
196 AcpiGbl_IntegerBitWidth = 64;
197 AcpiGbl_IntegerNybbleWidth = 16;
198 AcpiGbl_IntegerByteWidth = 8;
199 }
200 }
201
202
203 /*******************************************************************************
204 *
205 * FUNCTION: AcpiUtCreateUpdateStateAndPush
206 *
207 * PARAMETERS: Object - Object to be added to the new state
208 * Action - Increment/Decrement
209 * StateList - List the state will be added to
210 *
211 * RETURN: Status
212 *
213 * DESCRIPTION: Create a new state and push it
214 *
215 ******************************************************************************/
216
217 ACPI_STATUS
218 AcpiUtCreateUpdateStateAndPush (
219 ACPI_OPERAND_OBJECT *Object,
220 UINT16 Action,
221 ACPI_GENERIC_STATE **StateList)
222 {
223 ACPI_GENERIC_STATE *State;
224
225
226 ACPI_FUNCTION_ENTRY ();
227
228
229 /* Ignore null objects; these are expected */
230
231 if (!Object)
232 {
233 return (AE_OK);
234 }
235
236 State = AcpiUtCreateUpdateState (Object, Action);
237 if (!State)
238 {
239 return (AE_NO_MEMORY);
240 }
241
242 AcpiUtPushGenericState (StateList, State);
243 return (AE_OK);
244 }
245
246
247 /*******************************************************************************
248 *
249 * FUNCTION: AcpiUtWalkPackageTree
250 *
251 * PARAMETERS: SourceObject - The package to walk
252 * TargetObject - Target object (if package is being copied)
253 * WalkCallback - Called once for each package element
254 * Context - Passed to the callback function
255 *
256 * RETURN: Status
257 *
258 * DESCRIPTION: Walk through a package
259 *
260 ******************************************************************************/
261
262 ACPI_STATUS
263 AcpiUtWalkPackageTree (
264 ACPI_OPERAND_OBJECT *SourceObject,
265 void *TargetObject,
266 ACPI_PKG_CALLBACK WalkCallback,
267 void *Context)
268 {
269 ACPI_STATUS Status = AE_OK;
270 ACPI_GENERIC_STATE *StateList = NULL;
271 ACPI_GENERIC_STATE *State;
272 UINT32 ThisIndex;
273 ACPI_OPERAND_OBJECT *ThisSourceObj;
274
275
276 ACPI_FUNCTION_TRACE (UtWalkPackageTree);
277
278
279 State = AcpiUtCreatePkgState (SourceObject, TargetObject, 0);
280 if (!State)
281 {
282 return_ACPI_STATUS (AE_NO_MEMORY);
283 }
284
285 while (State)
286 {
287 /* Get one element of the package */
288
289 ThisIndex = State->Pkg.Index;
290 ThisSourceObj = (ACPI_OPERAND_OBJECT *)
291 State->Pkg.SourceObject->Package.Elements[ThisIndex];
292
293 /*
294 * Check for:
295 * 1) An uninitialized package element. It is completely
296 * legal to declare a package and leave it uninitialized
297 * 2) Not an internal object - can be a namespace node instead
298 * 3) Any type other than a package. Packages are handled in else
299 * case below.
300 */
301 if ((!ThisSourceObj) ||
302 (ACPI_GET_DESCRIPTOR_TYPE (ThisSourceObj) != ACPI_DESC_TYPE_OPERAND) ||
303 (ThisSourceObj->Common.Type != ACPI_TYPE_PACKAGE))
304 {
305 Status = WalkCallback (ACPI_COPY_TYPE_SIMPLE, ThisSourceObj,
306 State, Context);
307 if (ACPI_FAILURE (Status))
308 {
309 return_ACPI_STATUS (Status);
310 }
311
312 State->Pkg.Index++;
313 while (State->Pkg.Index >= State->Pkg.SourceObject->Package.Count)
314 {
315 /*
316 * We've handled all of the objects at this level, This means
317 * that we have just completed a package. That package may
318 * have contained one or more packages itself.
319 *
320 * Delete this state and pop the previous state (package).
321 */
322 AcpiUtDeleteGenericState (State);
323 State = AcpiUtPopGenericState (&StateList);
324
325 /* Finished when there are no more states */
326
327 if (!State)
328 {
329 /*
330 * We have handled all of the objects in the top level
331 * package just add the length of the package objects
332 * and exit
333 */
334 return_ACPI_STATUS (AE_OK);
335 }
336
337 /*
338 * Go back up a level and move the index past the just
339 * completed package object.
340 */
341 State->Pkg.Index++;
342 }
343 }
344 else
345 {
346 /* This is a subobject of type package */
347
348 Status = WalkCallback (ACPI_COPY_TYPE_PACKAGE, ThisSourceObj,
349 State, Context);
350 if (ACPI_FAILURE (Status))
351 {
352 return_ACPI_STATUS (Status);
353 }
354
355 /*
356 * Push the current state and create a new one
357 * The callback above returned a new target package object.
358 */
359 AcpiUtPushGenericState (&StateList, State);
360 State = AcpiUtCreatePkgState (ThisSourceObj,
361 State->Pkg.ThisTargetObj, 0);
362 if (!State)
363 {
364 /* Free any stacked Update State objects */
365
366 while (StateList)
367 {
368 State = AcpiUtPopGenericState (&StateList);
369 AcpiUtDeleteGenericState (State);
370 }
371 return_ACPI_STATUS (AE_NO_MEMORY);
372 }
373 }
374 }
375
376 /* We should never get here */
377
378 return_ACPI_STATUS (AE_AML_INTERNAL);
379 }
380
381
382 #ifdef ACPI_DEBUG_OUTPUT
383 /*******************************************************************************
384 *
385 * FUNCTION: AcpiUtDisplayInitPathname
386 *
387 * PARAMETERS: Type - Object type of the node
388 * ObjHandle - Handle whose pathname will be displayed
389 * Path - Additional path string to be appended.
390 * (NULL if no extra path)
391 *
392 * RETURN: ACPI_STATUS
393 *
394 * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
395 *
396 ******************************************************************************/
397
398 void
399 AcpiUtDisplayInitPathname (
400 UINT8 Type,
401 ACPI_NAMESPACE_NODE *ObjHandle,
402 char *Path)
403 {
404 ACPI_STATUS Status;
405 ACPI_BUFFER Buffer;
406
407
408 ACPI_FUNCTION_ENTRY ();
409
410
411 /* Only print the path if the appropriate debug level is enabled */
412
413 if (!(AcpiDbgLevel & ACPI_LV_INIT_NAMES))
414 {
415 return;
416 }
417
418 /* Get the full pathname to the node */
419
420 Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
421 Status = AcpiNsHandleToPathname (ObjHandle, &Buffer);
422 if (ACPI_FAILURE (Status))
423 {
424 return;
425 }
426
427 /* Print what we're doing */
428
429 switch (Type)
430 {
431 case ACPI_TYPE_METHOD:
432
433 AcpiOsPrintf ("Executing ");
434 break;
435
436 default:
437
438 AcpiOsPrintf ("Initializing ");
439 break;
440 }
441
442 /* Print the object type and pathname */
443
444 AcpiOsPrintf ("%-12s %s",
445 AcpiUtGetTypeName (Type), (char *) Buffer.Pointer);
446
447 /* Extra path is used to append names like _STA, _INI, etc. */
448
449 if (Path)
450 {
451 AcpiOsPrintf (".%s", Path);
452 }
453 AcpiOsPrintf ("\n");
454
455 ACPI_FREE (Buffer.Pointer);
456 }
457 #endif