| /******************************************************************************* |
| * |
| * Module Name: nsaccess - Top-level functions for accessing ACPI namespace |
| * |
| ******************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2020, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| #include "acpi.h" |
| #include "accommon.h" |
| #include "amlcode.h" |
| #include "acnamesp.h" |
| #include "acdispat.h" |
| |
| #ifdef ACPI_ASL_COMPILER |
| #include "acdisasm.h" |
| #endif |
| |
| #define _COMPONENT ACPI_NAMESPACE |
| ACPI_MODULE_NAME ("nsaccess") |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiNsRootInitialize |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Allocate and initialize the default root named objects |
| * |
| * MUTEX: Locks namespace for entire execution |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiNsRootInitialize ( |
| void) |
| { |
| ACPI_STATUS Status; |
| const ACPI_PREDEFINED_NAMES *InitVal = NULL; |
| ACPI_NAMESPACE_NODE *NewNode; |
| ACPI_NAMESPACE_NODE *PrevNode = NULL; |
| ACPI_OPERAND_OBJECT *ObjDesc; |
| ACPI_STRING Val = NULL; |
| |
| |
| ACPI_FUNCTION_TRACE (NsRootInitialize); |
| |
| |
| Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| |
| /* |
| * The global root ptr is initially NULL, so a non-NULL value indicates |
| * that AcpiNsRootInitialize() has already been called; just return. |
| */ |
| if (AcpiGbl_RootNode) |
| { |
| Status = AE_OK; |
| goto UnlockAndExit; |
| } |
| |
| /* |
| * Tell the rest of the subsystem that the root is initialized |
| * (This is OK because the namespace is locked) |
| */ |
| AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct; |
| |
| /* Enter the predefined names in the name table */ |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_INFO, |
| "Entering predefined entries into namespace\n")); |
| |
| /* |
| * Create the initial (default) namespace. |
| * This namespace looks like something similar to this: |
| * |
| * ACPI Namespace (from Namespace Root): |
| * 0 _GPE Scope 00203160 00 |
| * 0 _PR_ Scope 002031D0 00 |
| * 0 _SB_ Device 00203240 00 Notify Object: 0020ADD8 |
| * 0 _SI_ Scope 002032B0 00 |
| * 0 _TZ_ Device 00203320 00 |
| * 0 _REV Integer 00203390 00 = 0000000000000002 |
| * 0 _OS_ String 00203488 00 Len 14 "Microsoft Windows NT" |
| * 0 _GL_ Mutex 00203580 00 Object 002035F0 |
| * 0 _OSI Method 00203678 00 Args 1 Len 0000 Aml 00000000 |
| */ |
| for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++) |
| { |
| Status = AE_OK; |
| |
| /* _OSI is optional for now, will be permanent later */ |
| |
| if (!strcmp (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod) |
| { |
| continue; |
| } |
| |
| /* |
| * Create, init, and link the new predefined name |
| * Note: No need to use AcpiNsLookup here because all the |
| * predefined names are at the root level. It is much easier to |
| * just create and link the new node(s) here. |
| */ |
| NewNode = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_NAMESPACE_NODE)); |
| if (!NewNode) |
| { |
| Status = AE_NO_MEMORY; |
| goto UnlockAndExit; |
| } |
| |
| ACPI_COPY_NAMESEG (NewNode->Name.Ascii, InitVal->Name); |
| NewNode->DescriptorType = ACPI_DESC_TYPE_NAMED; |
| NewNode->Type = InitVal->Type; |
| |
| if (!PrevNode) |
| { |
| AcpiGbl_RootNodeStruct.Child = NewNode; |
| } |
| else |
| { |
| PrevNode->Peer = NewNode; |
| } |
| |
| NewNode->Parent = &AcpiGbl_RootNodeStruct; |
| PrevNode = NewNode; |
| |
| /* |
| * Name entered successfully. If entry in PreDefinedNames[] specifies |
| * an initial value, create the initial value. |
| */ |
| if (InitVal->Val) |
| { |
| Status = AcpiOsPredefinedOverride (InitVal, &Val); |
| if (ACPI_FAILURE (Status)) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Could not override predefined %s", |
| InitVal->Name)); |
| } |
| |
| if (!Val) |
| { |
| Val = InitVal->Val; |
| } |
| |
| /* |
| * Entry requests an initial value, allocate a |
| * descriptor for it. |
| */ |
| ObjDesc = AcpiUtCreateInternalObject (InitVal->Type); |
| if (!ObjDesc) |
| { |
| Status = AE_NO_MEMORY; |
| goto UnlockAndExit; |
| } |
| |
| /* |
| * Convert value string from table entry to |
| * internal representation. Only types actually |
| * used for initial values are implemented here. |
| */ |
| switch (InitVal->Type) |
| { |
| case ACPI_TYPE_METHOD: |
| |
| ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val); |
| ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; |
| |
| #if defined (ACPI_ASL_COMPILER) |
| |
| /* Save the parameter count for the iASL compiler */ |
| |
| NewNode->Value = ObjDesc->Method.ParamCount; |
| #else |
| /* Mark this as a very SPECIAL method (_OSI) */ |
| |
| ObjDesc->Method.InfoFlags = ACPI_METHOD_INTERNAL_ONLY; |
| ObjDesc->Method.Dispatch.Implementation = AcpiUtOsiImplementation; |
| #endif |
| break; |
| |
| case ACPI_TYPE_INTEGER: |
| |
| ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val); |
| break; |
| |
| case ACPI_TYPE_STRING: |
| |
| /* Build an object around the static string */ |
| |
| ObjDesc->String.Length = (UINT32) strlen (Val); |
| ObjDesc->String.Pointer = Val; |
| ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER; |
| break; |
| |
| case ACPI_TYPE_MUTEX: |
| |
| ObjDesc->Mutex.Node = NewNode; |
| ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1); |
| |
| /* Create a mutex */ |
| |
| Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex); |
| if (ACPI_FAILURE (Status)) |
| { |
| AcpiUtRemoveReference (ObjDesc); |
| goto UnlockAndExit; |
| } |
| |
| /* Special case for ACPI Global Lock */ |
| |
| if (strcmp (InitVal->Name, "_GL_") == 0) |
| { |
| AcpiGbl_GlobalLockMutex = ObjDesc; |
| |
| /* Create additional counting semaphore for global lock */ |
| |
| Status = AcpiOsCreateSemaphore ( |
| 1, 0, &AcpiGbl_GlobalLockSemaphore); |
| if (ACPI_FAILURE (Status)) |
| { |
| AcpiUtRemoveReference (ObjDesc); |
| goto UnlockAndExit; |
| } |
| } |
| break; |
| |
| default: |
| |
| ACPI_ERROR ((AE_INFO, "Unsupported initial type value 0x%X", |
| InitVal->Type)); |
| AcpiUtRemoveReference (ObjDesc); |
| ObjDesc = NULL; |
| continue; |
| } |
| |
| /* Store pointer to value descriptor in the Node */ |
| |
| Status = AcpiNsAttachObject (NewNode, ObjDesc, |
| ObjDesc->Common.Type); |
| |
| /* Remove local reference to the object */ |
| |
| AcpiUtRemoveReference (ObjDesc); |
| } |
| } |
| |
| UnlockAndExit: |
| (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); |
| |
| /* Save a handle to "_GPE", it is always present */ |
| |
| if (ACPI_SUCCESS (Status)) |
| { |
| Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, |
| &AcpiGbl_FadtGpeDevice); |
| } |
| |
| return_ACPI_STATUS (Status); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiNsLookup |
| * |
| * PARAMETERS: ScopeInfo - Current scope info block |
| * Pathname - Search pathname, in internal format |
| * (as represented in the AML stream) |
| * Type - Type associated with name |
| * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found |
| * Flags - Flags describing the search restrictions |
| * WalkState - Current state of the walk |
| * ReturnNode - Where the Node is placed (if found |
| * or created successfully) |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Find or enter the passed name in the name space. |
| * Log an error if name not found in Exec mode. |
| * |
| * MUTEX: Assumes namespace is locked. |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiNsLookup ( |
| ACPI_GENERIC_STATE *ScopeInfo, |
| char *Pathname, |
| ACPI_OBJECT_TYPE Type, |
| ACPI_INTERPRETER_MODE InterpreterMode, |
| UINT32 Flags, |
| ACPI_WALK_STATE *WalkState, |
| ACPI_NAMESPACE_NODE **ReturnNode) |
| { |
| ACPI_STATUS Status; |
| char *Path = Pathname; |
| char *ExternalPath; |
| ACPI_NAMESPACE_NODE *PrefixNode; |
| ACPI_NAMESPACE_NODE *CurrentNode = NULL; |
| ACPI_NAMESPACE_NODE *ThisNode = NULL; |
| UINT32 NumSegments; |
| UINT32 NumCarats; |
| ACPI_NAME SimpleName; |
| ACPI_OBJECT_TYPE TypeToCheckFor; |
| ACPI_OBJECT_TYPE ThisSearchType; |
| UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT; |
| UINT32 LocalFlags; |
| ACPI_INTERPRETER_MODE LocalInterpreterMode; |
| |
| |
| ACPI_FUNCTION_TRACE (NsLookup); |
| |
| |
| if (!ReturnNode) |
| { |
| return_ACPI_STATUS (AE_BAD_PARAMETER); |
| } |
| |
| LocalFlags = Flags & |
| ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND | |
| ACPI_NS_SEARCH_PARENT); |
| *ReturnNode = ACPI_ENTRY_NOT_FOUND; |
| AcpiGbl_NsLookupCount++; |
| |
| if (!AcpiGbl_RootNode) |
| { |
| return_ACPI_STATUS (AE_NO_NAMESPACE); |
| } |
| |
| /* Get the prefix scope. A null scope means use the root scope */ |
| |
| if ((!ScopeInfo) || |
| (!ScopeInfo->Scope.Node)) |
| { |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Null scope prefix, using root node (%p)\n", |
| AcpiGbl_RootNode)); |
| |
| PrefixNode = AcpiGbl_RootNode; |
| } |
| else |
| { |
| PrefixNode = ScopeInfo->Scope.Node; |
| if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED) |
| { |
| ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]", |
| PrefixNode, AcpiUtGetDescriptorName (PrefixNode))); |
| return_ACPI_STATUS (AE_AML_INTERNAL); |
| } |
| |
| if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE)) |
| { |
| /* |
| * This node might not be a actual "scope" node (such as a |
| * Device/Method, etc.) It could be a Package or other object |
| * node. Backup up the tree to find the containing scope node. |
| */ |
| while (!AcpiNsOpensScope (PrefixNode->Type) && |
| PrefixNode->Type != ACPI_TYPE_ANY) |
| { |
| PrefixNode = PrefixNode->Parent; |
| } |
| } |
| } |
| |
| /* Save type. TBD: may be no longer necessary */ |
| |
| TypeToCheckFor = Type; |
| |
| /* |
| * Begin examination of the actual pathname |
| */ |
| if (!Pathname) |
| { |
| /* A Null NamePath is allowed and refers to the root */ |
| |
| NumSegments = 0; |
| ThisNode = AcpiGbl_RootNode; |
| Path = ""; |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Null Pathname (Zero segments), Flags=%X\n", Flags)); |
| } |
| else |
| { |
| /* |
| * Name pointer is valid (and must be in internal name format) |
| * |
| * Check for scope prefixes: |
| * |
| * As represented in the AML stream, a namepath consists of an |
| * optional scope prefix followed by a name segment part. |
| * |
| * If present, the scope prefix is either a Root Prefix (in |
| * which case the name is fully qualified), or one or more |
| * Parent Prefixes (in which case the name's scope is relative |
| * to the current scope). |
| */ |
| if (*Path == (UINT8) AML_ROOT_PREFIX) |
| { |
| /* Pathname is fully qualified, start from the root */ |
| |
| ThisNode = AcpiGbl_RootNode; |
| SearchParentFlag = ACPI_NS_NO_UPSEARCH; |
| |
| /* Point to name segment part */ |
| |
| Path++; |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Path is absolute from root [%p]\n", ThisNode)); |
| } |
| else |
| { |
| /* Pathname is relative to current scope, start there */ |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Searching relative to prefix scope [%4.4s] (%p)\n", |
| AcpiUtGetNodeName (PrefixNode), PrefixNode)); |
| |
| /* |
| * Handle multiple Parent Prefixes (carat) by just getting |
| * the parent node for each prefix instance. |
| */ |
| ThisNode = PrefixNode; |
| NumCarats = 0; |
| while (*Path == (UINT8) AML_PARENT_PREFIX) |
| { |
| /* Name is fully qualified, no search rules apply */ |
| |
| SearchParentFlag = ACPI_NS_NO_UPSEARCH; |
| |
| /* |
| * Point past this prefix to the name segment |
| * part or the next Parent Prefix |
| */ |
| Path++; |
| |
| /* Backup to the parent node */ |
| |
| NumCarats++; |
| ThisNode = ThisNode->Parent; |
| if (!ThisNode) |
| { |
| /* |
| * Current scope has no parent scope. Externalize |
| * the internal path for error message. |
| */ |
| Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, Pathname, |
| NULL, &ExternalPath); |
| if (ACPI_SUCCESS (Status)) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "%s: Path has too many parent prefixes (^)", |
| ExternalPath)); |
| |
| ACPI_FREE (ExternalPath); |
| } |
| |
| return_ACPI_STATUS (AE_NOT_FOUND); |
| } |
| } |
| |
| if (SearchParentFlag == ACPI_NS_NO_UPSEARCH) |
| { |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Search scope is [%4.4s], path has %u carat(s)\n", |
| AcpiUtGetNodeName (ThisNode), NumCarats)); |
| } |
| } |
| |
| /* |
| * Determine the number of ACPI name segments in this pathname. |
| * |
| * The segment part consists of either: |
| * - A Null name segment (0) |
| * - A DualNamePrefix followed by two 4-byte name segments |
| * - A MultiNamePrefix followed by a byte indicating the |
| * number of segments and the segments themselves. |
| * - A single 4-byte name segment |
| * |
| * Examine the name prefix opcode, if any, to determine the number of |
| * segments. |
| */ |
| switch (*Path) |
| { |
| case 0: |
| /* |
| * Null name after a root or parent prefixes. We already |
| * have the correct target node and there are no name segments. |
| */ |
| NumSegments = 0; |
| Type = ThisNode->Type; |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Prefix-only Pathname (Zero name segments), Flags=%X\n", |
| Flags)); |
| break; |
| |
| case AML_DUAL_NAME_PREFIX: |
| |
| /* More than one NameSeg, search rules do not apply */ |
| |
| SearchParentFlag = ACPI_NS_NO_UPSEARCH; |
| |
| /* Two segments, point to first name segment */ |
| |
| NumSegments = 2; |
| Path++; |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Dual Pathname (2 segments, Flags=%X)\n", Flags)); |
| break; |
| |
| case AML_MULTI_NAME_PREFIX: |
| |
| /* More than one NameSeg, search rules do not apply */ |
| |
| SearchParentFlag = ACPI_NS_NO_UPSEARCH; |
| |
| /* Extract segment count, point to first name segment */ |
| |
| Path++; |
| NumSegments = (UINT32) (UINT8) *Path; |
| Path++; |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Multi Pathname (%u Segments, Flags=%X)\n", |
| NumSegments, Flags)); |
| break; |
| |
| default: |
| /* |
| * Not a Null name, no Dual or Multi prefix, hence there is |
| * only one name segment and Pathname is already pointing to it. |
| */ |
| NumSegments = 1; |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Simple Pathname (1 segment, Flags=%X)\n", Flags)); |
| break; |
| } |
| |
| ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path)); |
| } |
| |
| |
| /* |
| * Search namespace for each segment of the name. Loop through and |
| * verify (or add to the namespace) each name segment. |
| * |
| * The object type is significant only at the last name |
| * segment. (We don't care about the types along the path, only |
| * the type of the final target object.) |
| */ |
| ThisSearchType = ACPI_TYPE_ANY; |
| CurrentNode = ThisNode; |
| |
| while (NumSegments && CurrentNode) |
| { |
| NumSegments--; |
| if (!NumSegments) |
| { |
| /* This is the last segment, enable typechecking */ |
| |
| ThisSearchType = Type; |
| |
| /* |
| * Only allow automatic parent search (search rules) if the caller |
| * requested it AND we have a single, non-fully-qualified NameSeg |
| */ |
| if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) && |
| (Flags & ACPI_NS_SEARCH_PARENT)) |
| { |
| LocalFlags |= ACPI_NS_SEARCH_PARENT; |
| } |
| |
| /* Set error flag according to caller */ |
| |
| if (Flags & ACPI_NS_ERROR_IF_FOUND) |
| { |
| LocalFlags |= ACPI_NS_ERROR_IF_FOUND; |
| } |
| |
| /* Set override flag according to caller */ |
| |
| if (Flags & ACPI_NS_OVERRIDE_IF_FOUND) |
| { |
| LocalFlags |= ACPI_NS_OVERRIDE_IF_FOUND; |
| } |
| } |
| |
| /* Handle opcodes that create a new NameSeg via a full NamePath */ |
| |
| LocalInterpreterMode = InterpreterMode; |
| if ((Flags & ACPI_NS_PREFIX_MUST_EXIST) && (NumSegments > 0)) |
| { |
| /* Every element of the path must exist (except for the final NameSeg) */ |
| |
| LocalInterpreterMode = ACPI_IMODE_EXECUTE; |
| } |
| |
| /* Extract one ACPI name from the front of the pathname */ |
| |
| ACPI_MOVE_32_TO_32 (&SimpleName, Path); |
| |
| /* Try to find the single (4 character) ACPI name */ |
| |
| Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode, |
| LocalInterpreterMode, ThisSearchType, LocalFlags, &ThisNode); |
| if (ACPI_FAILURE (Status)) |
| { |
| if (Status == AE_NOT_FOUND) |
| { |
| #if !defined ACPI_ASL_COMPILER /* Note: iASL reports this error by itself, not needed here */ |
| if (Flags & ACPI_NS_PREFIX_MUST_EXIST) |
| { |
| AcpiOsPrintf (ACPI_MSG_BIOS_ERROR |
| "Object does not exist: %4.4s\n", (char *) &SimpleName); |
| } |
| #endif |
| /* Name not found in ACPI namespace */ |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| "Name [%4.4s] not found in scope [%4.4s] %p\n", |
| (char *) &SimpleName, (char *) &CurrentNode->Name, |
| CurrentNode)); |
| } |
| |
| #ifdef ACPI_EXEC_APP |
| if ((Status == AE_ALREADY_EXISTS) && |
| (ThisNode->Flags & ANOBJ_NODE_EARLY_INIT)) |
| { |
| ThisNode->Flags &= ~ANOBJ_NODE_EARLY_INIT; |
| Status = AE_OK; |
| } |
| #endif |
| |
| #ifdef ACPI_ASL_COMPILER |
| /* |
| * If this ACPI name already exists within the namespace as an |
| * external declaration, then mark the external as a conflicting |
| * declaration and proceed to process the current node as if it did |
| * not exist in the namespace. If this node is not processed as |
| * normal, then it could cause improper namespace resolution |
| * by failing to open a new scope. |
| */ |
| if (AcpiGbl_DisasmFlag && |
| (Status == AE_ALREADY_EXISTS) && |
| ((ThisNode->Flags & ANOBJ_IS_EXTERNAL) || |
| (WalkState && WalkState->Opcode == AML_EXTERNAL_OP))) |
| { |
| ThisNode->Flags &= ~ANOBJ_IS_EXTERNAL; |
| ThisNode->Type = (UINT8)ThisSearchType; |
| if (WalkState->Opcode != AML_EXTERNAL_OP) |
| { |
| AcpiDmMarkExternalConflict (ThisNode); |
| } |
| break; |
| } |
| #endif |
| |
| *ReturnNode = ThisNode; |
| return_ACPI_STATUS (Status); |
| } |
| |
| /* More segments to follow? */ |
| |
| if (NumSegments > 0) |
| { |
| /* |
| * If we have an alias to an object that opens a scope (such as a |
| * device or processor), we need to dereference the alias here so |
| * that we can access any children of the original node (via the |
| * remaining segments). |
| */ |
| if (ThisNode->Type == ACPI_TYPE_LOCAL_ALIAS) |
| { |
| if (!ThisNode->Object) |
| { |
| return_ACPI_STATUS (AE_NOT_EXIST); |
| } |
| |
| if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *) |
| ThisNode->Object)->Type)) |
| { |
| ThisNode = (ACPI_NAMESPACE_NODE *) ThisNode->Object; |
| } |
| } |
| } |
| |
| /* Special handling for the last segment (NumSegments == 0) */ |
| |
| else |
| { |
| /* |
| * Sanity typecheck of the target object: |
| * |
| * If 1) This is the last segment (NumSegments == 0) |
| * 2) And we are looking for a specific type |
| * (Not checking for TYPE_ANY) |
| * 3) Which is not an alias |
| * 4) Which is not a local type (TYPE_SCOPE) |
| * 5) And the type of target object is known (not TYPE_ANY) |
| * 6) And target object does not match what we are looking for |
| * |
| * Then we have a type mismatch. Just warn and ignore it. |
| */ |
| if ((TypeToCheckFor != ACPI_TYPE_ANY) && |
| (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) && |
| (TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) && |
| (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) && |
| (ThisNode->Type != ACPI_TYPE_ANY) && |
| (ThisNode->Type != TypeToCheckFor)) |
| { |
| /* Complain about a type mismatch */ |
| |
| ACPI_WARNING ((AE_INFO, |
| "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", |
| ACPI_CAST_PTR (char, &SimpleName), |
| AcpiUtGetTypeName (ThisNode->Type), |
| AcpiUtGetTypeName (TypeToCheckFor))); |
| } |
| |
| /* |
| * If this is the last name segment and we are not looking for a |
| * specific type, but the type of found object is known, use that |
| * type to (later) see if it opens a scope. |
| */ |
| if (Type == ACPI_TYPE_ANY) |
| { |
| Type = ThisNode->Type; |
| } |
| } |
| |
| /* Point to next name segment and make this node current */ |
| |
| Path += ACPI_NAMESEG_SIZE; |
| CurrentNode = ThisNode; |
| } |
| |
| /* Always check if we need to open a new scope */ |
| |
| if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState)) |
| { |
| /* |
| * If entry is a type which opens a scope, push the new scope on the |
| * scope stack. |
| */ |
| if (AcpiNsOpensScope (Type)) |
| { |
| Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| } |
| } |
| |
| #ifdef ACPI_EXEC_APP |
| if (Flags & ACPI_NS_EARLY_INIT) |
| { |
| ThisNode->Flags |= ANOBJ_NODE_EARLY_INIT; |
| } |
| #endif |
| |
| *ReturnNode = ThisNode; |
| return_ACPI_STATUS (AE_OK); |
| } |
