1 /******************************************************************************
3 * Module Name: exnames - interpreter/scanner name load/execute
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2013, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions, and the following disclaimer,
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20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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
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46 #include <contrib/dev/acpica/include/acpi.h>
47 #include <contrib/dev/acpica/include/accommon.h>
48 #include <contrib/dev/acpica/include/acinterp.h>
49 #include <contrib/dev/acpica/include/amlcode.h>
51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME ("exnames")
54 /* Local prototypes */
57 AcpiExAllocateNameString (
67 /*******************************************************************************
69 * FUNCTION: AcpiExAllocateNameString
71 * PARAMETERS: PrefixCount - Count of parent levels. Special cases:
73 * NumNameSegs - count of 4-character name segments
75 * RETURN: A pointer to the allocated string segment. This segment must
76 * be deleted by the caller.
78 * DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name
79 * string is long enough, and set up prefix if any.
81 ******************************************************************************/
84 AcpiExAllocateNameString (
92 ACPI_FUNCTION_TRACE (ExAllocateNameString);
96 * Allow room for all \ and ^ prefixes, all segments and a MultiNamePrefix.
97 * Also, one byte for the null terminator.
98 * This may actually be somewhat longer than needed.
100 if (PrefixCount == ACPI_UINT32_MAX)
102 /* Special case for root */
104 SizeNeeded = 1 + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
108 SizeNeeded = PrefixCount + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
112 * Allocate a buffer for the name.
113 * This buffer must be deleted by the caller!
115 NameString = ACPI_ALLOCATE (SizeNeeded);
118 ACPI_ERROR ((AE_INFO,
119 "Could not allocate size %u", SizeNeeded));
123 TempPtr = NameString;
125 /* Set up Root or Parent prefixes if needed */
127 if (PrefixCount == ACPI_UINT32_MAX)
129 *TempPtr++ = AML_ROOT_PREFIX;
133 while (PrefixCount--)
135 *TempPtr++ = AML_PARENT_PREFIX;
140 /* Set up Dual or Multi prefixes if needed */
144 /* Set up multi prefixes */
146 *TempPtr++ = AML_MULTI_NAME_PREFIX_OP;
147 *TempPtr++ = (char) NumNameSegs;
149 else if (2 == NumNameSegs)
151 /* Set up dual prefixes */
153 *TempPtr++ = AML_DUAL_NAME_PREFIX;
157 * Terminate string following prefixes. AcpiExNameSegment() will
158 * append the segment(s)
162 return_PTR (NameString);
165 /*******************************************************************************
167 * FUNCTION: AcpiExNameSegment
169 * PARAMETERS: InAmlAddress - Pointer to the name in the AML code
170 * NameString - Where to return the name. The name is appended
171 * to any existing string to form a namepath
175 * DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream
177 ******************************************************************************/
181 UINT8 **InAmlAddress,
184 char *AmlAddress = (void *) *InAmlAddress;
185 ACPI_STATUS Status = AE_OK;
190 ACPI_FUNCTION_TRACE (ExNameSegment);
194 * If first character is a digit, then we know that we aren't looking at a
197 CharBuf[0] = *AmlAddress;
199 if ('0' <= CharBuf[0] && CharBuf[0] <= '9')
201 ACPI_ERROR ((AE_INFO, "Invalid leading digit: %c", CharBuf[0]));
202 return_ACPI_STATUS (AE_CTRL_PENDING);
205 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "Bytes from stream:\n"));
208 (Index < ACPI_NAME_SIZE) && (AcpiUtValidAcpiChar (*AmlAddress, 0));
211 CharBuf[Index] = *AmlAddress++;
212 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "%c\n", CharBuf[Index]));
216 /* Valid name segment */
220 /* Found 4 valid characters */
226 ACPI_STRCAT (NameString, CharBuf);
227 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
228 "Appended to - %s\n", NameString));
232 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
233 "No Name string - %s\n", CharBuf));
239 * First character was not a valid name character,
240 * so we are looking at something other than a name.
242 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
243 "Leading character is not alpha: %02Xh (not a name)\n",
245 Status = AE_CTRL_PENDING;
250 * Segment started with one or more valid characters, but fewer than
253 Status = AE_AML_BAD_NAME;
254 ACPI_ERROR ((AE_INFO,
255 "Bad character 0x%02x in name, at %p",
256 *AmlAddress, AmlAddress));
259 *InAmlAddress = ACPI_CAST_PTR (UINT8, AmlAddress);
260 return_ACPI_STATUS (Status);
264 /*******************************************************************************
266 * FUNCTION: AcpiExGetNameString
268 * PARAMETERS: DataType - Object type to be associated with this
270 * InAmlAddress - Pointer to the namestring in the AML code
271 * OutNameString - Where the namestring is returned
272 * OutNameLength - Length of the returned string
274 * RETURN: Status, namestring and length
276 * DESCRIPTION: Extract a full namepath from the AML byte stream,
277 * including any prefixes.
279 ******************************************************************************/
282 AcpiExGetNameString (
283 ACPI_OBJECT_TYPE DataType,
285 char **OutNameString,
286 UINT32 *OutNameLength)
288 ACPI_STATUS Status = AE_OK;
289 UINT8 *AmlAddress = InAmlAddress;
290 char *NameString = NULL;
292 UINT32 PrefixCount = 0;
293 BOOLEAN HasPrefix = FALSE;
296 ACPI_FUNCTION_TRACE_PTR (ExGetNameString, AmlAddress);
299 if (ACPI_TYPE_LOCAL_REGION_FIELD == DataType ||
300 ACPI_TYPE_LOCAL_BANK_FIELD == DataType ||
301 ACPI_TYPE_LOCAL_INDEX_FIELD == DataType)
303 /* Disallow prefixes for types associated with FieldUnit names */
305 NameString = AcpiExAllocateNameString (0, 1);
308 Status = AE_NO_MEMORY;
312 Status = AcpiExNameSegment (&AmlAddress, NameString);
318 * DataType is not a field name.
319 * Examine first character of name for root or parent prefix operators
323 case AML_ROOT_PREFIX:
325 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "RootPrefix(\\) at %p\n",
329 * Remember that we have a RootPrefix --
330 * see comment in AcpiExAllocateNameString()
333 PrefixCount = ACPI_UINT32_MAX;
337 case AML_PARENT_PREFIX:
339 /* Increment past possibly multiple parent prefixes */
343 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "ParentPrefix (^) at %p\n",
349 } while (*AmlAddress == AML_PARENT_PREFIX);
356 /* Not a prefix character */
361 /* Examine first character of name for name segment prefix operator */
365 case AML_DUAL_NAME_PREFIX:
367 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "DualNamePrefix at %p\n",
371 NameString = AcpiExAllocateNameString (PrefixCount, 2);
374 Status = AE_NO_MEMORY;
378 /* Indicate that we processed a prefix */
382 Status = AcpiExNameSegment (&AmlAddress, NameString);
383 if (ACPI_SUCCESS (Status))
385 Status = AcpiExNameSegment (&AmlAddress, NameString);
389 case AML_MULTI_NAME_PREFIX_OP:
391 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "MultiNamePrefix at %p\n",
394 /* Fetch count of segments remaining in name path */
397 NumSegments = *AmlAddress;
399 NameString = AcpiExAllocateNameString (PrefixCount, NumSegments);
402 Status = AE_NO_MEMORY;
406 /* Indicate that we processed a prefix */
411 while (NumSegments &&
412 (Status = AcpiExNameSegment (&AmlAddress, NameString)) ==
422 /* NullName valid as of 8-12-98 ASL/AML Grammar Update */
424 if (PrefixCount == ACPI_UINT32_MAX)
426 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
427 "NameSeg is \"\\\" followed by NULL\n"));
430 /* Consume the NULL byte */
433 NameString = AcpiExAllocateNameString (PrefixCount, 0);
436 Status = AE_NO_MEMORY;
444 /* Name segment string */
446 NameString = AcpiExAllocateNameString (PrefixCount, 1);
449 Status = AE_NO_MEMORY;
453 Status = AcpiExNameSegment (&AmlAddress, NameString);
458 if (AE_CTRL_PENDING == Status && HasPrefix)
460 /* Ran out of segments after processing a prefix */
462 ACPI_ERROR ((AE_INFO,
463 "Malformed Name at %p", NameString));
464 Status = AE_AML_BAD_NAME;
467 if (ACPI_FAILURE (Status))
471 ACPI_FREE (NameString);
473 return_ACPI_STATUS (Status);
476 *OutNameString = NameString;
477 *OutNameLength = (UINT32) (AmlAddress - InAmlAddress);
479 return_ACPI_STATUS (Status);