/****************************************************************************** * * Module Name: exnames - interpreter/scanner name load/execute * $Revision: 1.112 $ * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp. * All rights reserved. * * 2. License * * 2.1. This is your license from Intel Corp. under its intellectual property * rights. You may have additional license terms from the party that provided * you this software, covering your right to use that party's intellectual * property rights. * * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a * copy of the source code appearing in this file ("Covered Code") an * irrevocable, perpetual, worldwide license under Intel's copyrights in the * base code distributed originally by Intel ("Original Intel Code") to copy, * make derivatives, distribute, use and display any portion of the Covered * Code in any form, with the right to sublicense such rights; and * * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent * license (with the right to sublicense), under only those claims of Intel * patents that are infringed by the Original Intel Code, to make, use, sell, * offer to sell, and import the Covered Code and derivative works thereof * solely to the minimum extent necessary to exercise the above copyright * license, and in no event shall the patent license extend to any additions * to or modifications of the Original Intel Code. No other license or right * is granted directly or by implication, estoppel or otherwise; * * The above copyright and patent license is granted only if the following * conditions are met: * * 3. Conditions * * 3.1. Redistribution of Source with Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification with rights to further distribute source must include * the above Copyright Notice, the above License, this list of Conditions, * and the following Disclaimer and Export Compliance provision. In addition, * Licensee must cause all Covered Code to which Licensee contributes to * contain a file documenting the changes Licensee made to create that Covered * Code and the date of any change. Licensee must include in that file the * documentation of any changes made by any predecessor Licensee. Licensee * must include a prominent statement that the modification is derived, * directly or indirectly, from Original Intel Code. * * 3.2. Redistribution of Source with no Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification without rights to further distribute source must * include the following Disclaimer and Export Compliance provision in the * documentation and/or other materials provided with distribution. In * addition, Licensee may not authorize further sublicense of source of any * portion of the Covered Code, and must include terms to the effect that the * license from Licensee to its licensee is limited to the intellectual * property embodied in the software Licensee provides to its licensee, and * not to intellectual property embodied in modifications its licensee may * make. * * 3.3. Redistribution of Executable. Redistribution in executable form of any * substantial portion of the Covered Code or modification must reproduce the * above Copyright Notice, and the following Disclaimer and Export Compliance * provision in the documentation and/or other materials provided with the * distribution. * * 3.4. Intel retains all right, title, and interest in and to the Original * Intel Code. * * 3.5. Neither the name Intel nor any other trademark owned or controlled by * Intel shall be used in advertising or otherwise to promote the sale, use or * other dealings in products derived from or relating to the Covered Code * without prior written authorization from Intel. * * 4. Disclaimer and Export Compliance * * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A * PARTICULAR PURPOSE. * * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY * LIMITED REMEDY. * * 4.3. Licensee shall not export, either directly or indirectly, any of this * software or system incorporating such software without first obtaining any * required license or other approval from the U. S. Department of Commerce or * any other agency or department of the United States Government. In the * event Licensee exports any such software from the United States or * re-exports any such software from a foreign destination, Licensee shall * ensure that the distribution and export/re-export of the software is in * compliance with all laws, regulations, orders, or other restrictions of the * U.S. Export Administration Regulations. Licensee agrees that neither it nor * any of its subsidiaries will export/re-export any technical data, process, * software, or service, directly or indirectly, to any country for which the * United States government or any agency thereof requires an export license, * other governmental approval, or letter of assurance, without first obtaining * such license, approval or letter. * *****************************************************************************/ #define __EXNAMES_C__ #include "acpi.h" #include "acinterp.h" #include "amlcode.h" #define _COMPONENT ACPI_EXECUTER ACPI_MODULE_NAME ("exnames") /* Local prototypes */ static char * AcpiExAllocateNameString ( UINT32 PrefixCount, UINT32 NumNameSegs); static ACPI_STATUS AcpiExNameSegment ( UINT8 **InAmlAddress, char *NameString); /******************************************************************************* * * FUNCTION: AcpiExAllocateNameString * * PARAMETERS: PrefixCount - Count of parent levels. Special cases: * (-1)==root, 0==none * NumNameSegs - count of 4-character name segments * * RETURN: A pointer to the allocated string segment. This segment must * be deleted by the caller. * * DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name * string is long enough, and set up prefix if any. * ******************************************************************************/ static char * AcpiExAllocateNameString ( UINT32 PrefixCount, UINT32 NumNameSegs) { char *TempPtr; char *NameString; UINT32 SizeNeeded; ACPI_FUNCTION_TRACE (ExAllocateNameString); /* * Allow room for all \ and ^ prefixes, all segments and a MultiNamePrefix. * Also, one byte for the null terminator. * This may actually be somewhat longer than needed. */ if (PrefixCount == ACPI_UINT32_MAX) { /* Special case for root */ SizeNeeded = 1 + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1; } else { SizeNeeded = PrefixCount + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1; } /* * Allocate a buffer for the name. * This buffer must be deleted by the caller! */ NameString = ACPI_ALLOCATE (SizeNeeded); if (!NameString) { ACPI_ERROR ((AE_INFO, "Could not allocate size %d", SizeNeeded)); return_PTR (NULL); } TempPtr = NameString; /* Set up Root or Parent prefixes if needed */ if (PrefixCount == ACPI_UINT32_MAX) { *TempPtr++ = AML_ROOT_PREFIX; } else { while (PrefixCount--) { *TempPtr++ = AML_PARENT_PREFIX; } } /* Set up Dual or Multi prefixes if needed */ if (NumNameSegs > 2) { /* Set up multi prefixes */ *TempPtr++ = AML_MULTI_NAME_PREFIX_OP; *TempPtr++ = (char) NumNameSegs; } else if (2 == NumNameSegs) { /* Set up dual prefixes */ *TempPtr++ = AML_DUAL_NAME_PREFIX; } /* * Terminate string following prefixes. AcpiExNameSegment() will * append the segment(s) */ *TempPtr = 0; return_PTR (NameString); } /******************************************************************************* * * FUNCTION: AcpiExNameSegment * * PARAMETERS: InAmlAddress - Pointer to the name in the AML code * NameString - Where to return the name. The name is appended * to any existing string to form a namepath * * RETURN: Status * * DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream * ******************************************************************************/ static ACPI_STATUS AcpiExNameSegment ( UINT8 **InAmlAddress, char *NameString) { char *AmlAddress = (void *) *InAmlAddress; ACPI_STATUS Status = AE_OK; UINT32 Index; char CharBuf[5]; ACPI_FUNCTION_TRACE (ExNameSegment); /* * If first character is a digit, then we know that we aren't looking at a * valid name segment */ CharBuf[0] = *AmlAddress; if ('0' <= CharBuf[0] && CharBuf[0] <= '9') { ACPI_ERROR ((AE_INFO, "Invalid leading digit: %c", CharBuf[0])); return_ACPI_STATUS (AE_CTRL_PENDING); } ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "Bytes from stream:\n")); for (Index = 0; (Index < ACPI_NAME_SIZE) && (AcpiUtValidAcpiChar (*AmlAddress, 0)); Index++) { CharBuf[Index] = *AmlAddress++; ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "%c\n", CharBuf[Index])); } /* Valid name segment */ if (Index == 4) { /* Found 4 valid characters */ CharBuf[4] = '\0'; if (NameString) { ACPI_STRCAT (NameString, CharBuf); ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Appended to - %s\n", NameString)); } else { ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "No Name string - %s\n", CharBuf)); } } else if (Index == 0) { /* * First character was not a valid name character, * so we are looking at something other than a name. */ ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Leading character is not alpha: %02Xh (not a name)\n", CharBuf[0])); Status = AE_CTRL_PENDING; } else { /* * Segment started with one or more valid characters, but fewer than * the required 4 */ Status = AE_AML_BAD_NAME; ACPI_ERROR ((AE_INFO, "Bad character %02x in name, at %p", *AmlAddress, AmlAddress)); } *InAmlAddress = ACPI_CAST_PTR (UINT8, AmlAddress); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExGetNameString * * PARAMETERS: DataType - Object type to be associated with this * name * InAmlAddress - Pointer to the namestring in the AML code * OutNameString - Where the namestring is returned * OutNameLength - Length of the returned string * * RETURN: Status, namestring and length * * DESCRIPTION: Extract a full namepath from the AML byte stream, * including any prefixes. * ******************************************************************************/ ACPI_STATUS AcpiExGetNameString ( ACPI_OBJECT_TYPE DataType, UINT8 *InAmlAddress, char **OutNameString, UINT32 *OutNameLength) { ACPI_STATUS Status = AE_OK; UINT8 *AmlAddress = InAmlAddress; char *NameString = NULL; UINT32 NumSegments; UINT32 PrefixCount = 0; BOOLEAN HasPrefix = FALSE; ACPI_FUNCTION_TRACE_PTR (ExGetNameString, AmlAddress); if (ACPI_TYPE_LOCAL_REGION_FIELD == DataType || ACPI_TYPE_LOCAL_BANK_FIELD == DataType || ACPI_TYPE_LOCAL_INDEX_FIELD == DataType) { /* Disallow prefixes for types associated with FieldUnit names */ NameString = AcpiExAllocateNameString (0, 1); if (!NameString) { Status = AE_NO_MEMORY; } else { Status = AcpiExNameSegment (&AmlAddress, NameString); } } else { /* * DataType is not a field name. * Examine first character of name for root or parent prefix operators */ switch (*AmlAddress) { case AML_ROOT_PREFIX: ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "RootPrefix(\\) at %p\n", AmlAddress)); /* * Remember that we have a RootPrefix -- * see comment in AcpiExAllocateNameString() */ AmlAddress++; PrefixCount = ACPI_UINT32_MAX; HasPrefix = TRUE; break; case AML_PARENT_PREFIX: /* Increment past possibly multiple parent prefixes */ do { ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "ParentPrefix (^) at %p\n", AmlAddress)); AmlAddress++; PrefixCount++; } while (*AmlAddress == AML_PARENT_PREFIX); HasPrefix = TRUE; break; default: /* Not a prefix character */ break; } /* Examine first character of name for name segment prefix operator */ switch (*AmlAddress) { case AML_DUAL_NAME_PREFIX: ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "DualNamePrefix at %p\n", AmlAddress)); AmlAddress++; NameString = AcpiExAllocateNameString (PrefixCount, 2); if (!NameString) { Status = AE_NO_MEMORY; break; } /* Indicate that we processed a prefix */ HasPrefix = TRUE; Status = AcpiExNameSegment (&AmlAddress, NameString); if (ACPI_SUCCESS (Status)) { Status = AcpiExNameSegment (&AmlAddress, NameString); } break; case AML_MULTI_NAME_PREFIX_OP: ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "MultiNamePrefix at %p\n", AmlAddress)); /* Fetch count of segments remaining in name path */ AmlAddress++; NumSegments = *AmlAddress; NameString = AcpiExAllocateNameString (PrefixCount, NumSegments); if (!NameString) { Status = AE_NO_MEMORY; break; } /* Indicate that we processed a prefix */ AmlAddress++; HasPrefix = TRUE; while (NumSegments && (Status = AcpiExNameSegment (&AmlAddress, NameString)) == AE_OK) { NumSegments--; } break; case 0: /* NullName valid as of 8-12-98 ASL/AML Grammar Update */ if (PrefixCount == ACPI_UINT32_MAX) { ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "NameSeg is \"\\\" followed by NULL\n")); } /* Consume the NULL byte */ AmlAddress++; NameString = AcpiExAllocateNameString (PrefixCount, 0); if (!NameString) { Status = AE_NO_MEMORY; break; } break; default: /* Name segment string */ NameString = AcpiExAllocateNameString (PrefixCount, 1); if (!NameString) { Status = AE_NO_MEMORY; break; } Status = AcpiExNameSegment (&AmlAddress, NameString); break; } } if (AE_CTRL_PENDING == Status && HasPrefix) { /* Ran out of segments after processing a prefix */ ACPI_ERROR ((AE_INFO, "Malformed Name at %p", NameString)); Status = AE_AML_BAD_NAME; } if (ACPI_FAILURE (Status)) { if (NameString) { ACPI_FREE (NameString); } return_ACPI_STATUS (Status); } *OutNameString = NameString; *OutNameLength = (UINT32) (AmlAddress - InAmlAddress); return_ACPI_STATUS (Status); }