/****************************************************************************** * * Module Name: psparse - Parser top level AML parse routines * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2009, 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. * *****************************************************************************/ /* * Parse the AML and build an operation tree as most interpreters, * like Perl, do. Parsing is done by hand rather than with a YACC * generated parser to tightly constrain stack and dynamic memory * usage. At the same time, parsing is kept flexible and the code * fairly compact by parsing based on a list of AML opcode * templates in AmlOpInfo[] */ #include "acpi.h" #include "accommon.h" #include "acparser.h" #include "acdispat.h" #include "amlcode.h" #include "acnamesp.h" #include "acinterp.h" #define _COMPONENT ACPI_PARSER ACPI_MODULE_NAME ("psparse") /******************************************************************************* * * FUNCTION: AcpiPsGetOpcodeSize * * PARAMETERS: Opcode - An AML opcode * * RETURN: Size of the opcode, in bytes (1 or 2) * * DESCRIPTION: Get the size of the current opcode. * ******************************************************************************/ UINT32 AcpiPsGetOpcodeSize ( UINT32 Opcode) { /* Extended (2-byte) opcode if > 255 */ if (Opcode > 0x00FF) { return (2); } /* Otherwise, just a single byte opcode */ return (1); } /******************************************************************************* * * FUNCTION: AcpiPsPeekOpcode * * PARAMETERS: ParserState - A parser state object * * RETURN: Next AML opcode * * DESCRIPTION: Get next AML opcode (without incrementing AML pointer) * ******************************************************************************/ UINT16 AcpiPsPeekOpcode ( ACPI_PARSE_STATE *ParserState) { UINT8 *Aml; UINT16 Opcode; Aml = ParserState->Aml; Opcode = (UINT16) ACPI_GET8 (Aml); if (Opcode == AML_EXTENDED_OP_PREFIX) { /* Extended opcode, get the second opcode byte */ Aml++; Opcode = (UINT16) ((Opcode << 8) | ACPI_GET8 (Aml)); } return (Opcode); } /******************************************************************************* * * FUNCTION: AcpiPsCompleteThisOp * * PARAMETERS: WalkState - Current State * Op - Op to complete * * RETURN: Status * * DESCRIPTION: Perform any cleanup at the completion of an Op. * ******************************************************************************/ ACPI_STATUS AcpiPsCompleteThisOp ( ACPI_WALK_STATE *WalkState, ACPI_PARSE_OBJECT *Op) { ACPI_PARSE_OBJECT *Prev; ACPI_PARSE_OBJECT *Next; const ACPI_OPCODE_INFO *ParentInfo; ACPI_PARSE_OBJECT *ReplacementOp = NULL; ACPI_STATUS Status = AE_OK; ACPI_FUNCTION_TRACE_PTR (PsCompleteThisOp, Op); /* Check for null Op, can happen if AML code is corrupt */ if (!Op) { return_ACPI_STATUS (AE_OK); /* OK for now */ } /* Delete this op and the subtree below it if asked to */ if (((WalkState->ParseFlags & ACPI_PARSE_TREE_MASK) != ACPI_PARSE_DELETE_TREE) || (WalkState->OpInfo->Class == AML_CLASS_ARGUMENT)) { return_ACPI_STATUS (AE_OK); } /* Make sure that we only delete this subtree */ if (Op->Common.Parent) { Prev = Op->Common.Parent->Common.Value.Arg; if (!Prev) { /* Nothing more to do */ goto Cleanup; } /* * Check if we need to replace the operator and its subtree * with a return value op (placeholder op) */ ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode); switch (ParentInfo->Class) { case AML_CLASS_CONTROL: break; case AML_CLASS_CREATE: /* * These opcodes contain TermArg operands. The current * op must be replaced by a placeholder return op */ ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP); if (!ReplacementOp) { Status = AE_NO_MEMORY; } break; case AML_CLASS_NAMED_OBJECT: /* * These opcodes contain TermArg operands. The current * op must be replaced by a placeholder return op */ if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP) || (Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP) || (Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP) || (Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) || (Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP) || (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP)) { ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP); if (!ReplacementOp) { Status = AE_NO_MEMORY; } } else if ((Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) && (WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2)) { if ((Op->Common.AmlOpcode == AML_BUFFER_OP) || (Op->Common.AmlOpcode == AML_PACKAGE_OP) || (Op->Common.AmlOpcode == AML_VAR_PACKAGE_OP)) { ReplacementOp = AcpiPsAllocOp (Op->Common.AmlOpcode); if (!ReplacementOp) { Status = AE_NO_MEMORY; } else { ReplacementOp->Named.Data = Op->Named.Data; ReplacementOp->Named.Length = Op->Named.Length; } } } break; default: ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP); if (!ReplacementOp) { Status = AE_NO_MEMORY; } } /* We must unlink this op from the parent tree */ if (Prev == Op) { /* This op is the first in the list */ if (ReplacementOp) { ReplacementOp->Common.Parent = Op->Common.Parent; ReplacementOp->Common.Value.Arg = NULL; ReplacementOp->Common.Node = Op->Common.Node; Op->Common.Parent->Common.Value.Arg = ReplacementOp; ReplacementOp->Common.Next = Op->Common.Next; } else { Op->Common.Parent->Common.Value.Arg = Op->Common.Next; } } /* Search the parent list */ else while (Prev) { /* Traverse all siblings in the parent's argument list */ Next = Prev->Common.Next; if (Next == Op) { if (ReplacementOp) { ReplacementOp->Common.Parent = Op->Common.Parent; ReplacementOp->Common.Value.Arg = NULL; ReplacementOp->Common.Node = Op->Common.Node; Prev->Common.Next = ReplacementOp; ReplacementOp->Common.Next = Op->Common.Next; Next = NULL; } else { Prev->Common.Next = Op->Common.Next; Next = NULL; } } Prev = Next; } } Cleanup: /* Now we can actually delete the subtree rooted at Op */ AcpiPsDeleteParseTree (Op); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiPsNextParseState * * PARAMETERS: WalkState - Current state * Op - Current parse op * CallbackStatus - Status from previous operation * * RETURN: Status * * DESCRIPTION: Update the parser state based upon the return exception from * the parser callback. * ******************************************************************************/ ACPI_STATUS AcpiPsNextParseState ( ACPI_WALK_STATE *WalkState, ACPI_PARSE_OBJECT *Op, ACPI_STATUS CallbackStatus) { ACPI_PARSE_STATE *ParserState = &WalkState->ParserState; ACPI_STATUS Status = AE_CTRL_PENDING; ACPI_FUNCTION_TRACE_PTR (PsNextParseState, Op); switch (CallbackStatus) { case AE_CTRL_TERMINATE: /* * A control method was terminated via a RETURN statement. * The walk of this method is complete. */ ParserState->Aml = ParserState->AmlEnd; Status = AE_CTRL_TERMINATE; break; case AE_CTRL_BREAK: ParserState->Aml = WalkState->AmlLastWhile; WalkState->ControlState->Common.Value = FALSE; Status = AE_CTRL_BREAK; break; case AE_CTRL_CONTINUE: ParserState->Aml = WalkState->AmlLastWhile; Status = AE_CTRL_CONTINUE; break; case AE_CTRL_PENDING: ParserState->Aml = WalkState->AmlLastWhile; break; #if 0 case AE_CTRL_SKIP: ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd; Status = AE_OK; break; #endif case AE_CTRL_TRUE: /* * Predicate of an IF was true, and we are at the matching ELSE. * Just close out this package */ ParserState->Aml = AcpiPsGetNextPackageEnd (ParserState); Status = AE_CTRL_PENDING; break; case AE_CTRL_FALSE: /* * Either an IF/WHILE Predicate was false or we encountered a BREAK * opcode. In both cases, we do not execute the rest of the * package; We simply close out the parent (finishing the walk of * this branch of the tree) and continue execution at the parent * level. */ ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd; /* In the case of a BREAK, just force a predicate (if any) to FALSE */ WalkState->ControlState->Common.Value = FALSE; Status = AE_CTRL_END; break; case AE_CTRL_TRANSFER: /* A method call (invocation) -- transfer control */ Status = AE_CTRL_TRANSFER; WalkState->PrevOp = Op; WalkState->MethodCallOp = Op; WalkState->MethodCallNode = (Op->Common.Value.Arg)->Common.Node; /* Will return value (if any) be used by the caller? */ WalkState->ReturnUsed = AcpiDsIsResultUsed (Op, WalkState); break; default: Status = CallbackStatus; if ((CallbackStatus & AE_CODE_MASK) == AE_CODE_CONTROL) { Status = AE_OK; } break; } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiPsParseAml * * PARAMETERS: WalkState - Current state * * * RETURN: Status * * DESCRIPTION: Parse raw AML and return a tree of ops * ******************************************************************************/ ACPI_STATUS AcpiPsParseAml ( ACPI_WALK_STATE *WalkState) { ACPI_STATUS Status; ACPI_THREAD_STATE *Thread; ACPI_THREAD_STATE *PrevWalkList = AcpiGbl_CurrentWalkList; ACPI_WALK_STATE *PreviousWalkState; ACPI_FUNCTION_TRACE (PsParseAml); ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Entered with WalkState=%p Aml=%p size=%X\n", WalkState, WalkState->ParserState.Aml, WalkState->ParserState.AmlSize)); if (!WalkState->ParserState.Aml) { return_ACPI_STATUS (AE_NULL_OBJECT); } /* Create and initialize a new thread state */ Thread = AcpiUtCreateThreadState (); if (!Thread) { if (WalkState->MethodDesc) { /* Executing a control method - additional cleanup */ AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState); } AcpiDsDeleteWalkState (WalkState); return_ACPI_STATUS (AE_NO_MEMORY); } WalkState->Thread = Thread; /* * If executing a method, the starting SyncLevel is this method's * SyncLevel */ if (WalkState->MethodDesc) { WalkState->Thread->CurrentSyncLevel = WalkState->MethodDesc->Method.SyncLevel; } AcpiDsPushWalkState (WalkState, Thread); /* * This global allows the AML debugger to get a handle to the currently * executing control method. */ AcpiGbl_CurrentWalkList = Thread; /* * Execute the walk loop as long as there is a valid Walk State. This * handles nested control method invocations without recursion. */ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "State=%p\n", WalkState)); Status = AE_OK; while (WalkState) { if (ACPI_SUCCESS (Status)) { /* * The ParseLoop executes AML until the method terminates * or calls another method. */ Status = AcpiPsParseLoop (WalkState); } ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Completed one call to walk loop, %s State=%p\n", AcpiFormatException (Status), WalkState)); if (Status == AE_CTRL_TRANSFER) { /* * A method call was detected. * Transfer control to the called control method */ Status = AcpiDsCallControlMethod (Thread, WalkState, NULL); if (ACPI_FAILURE (Status)) { Status = AcpiDsMethodError (Status, WalkState); } /* * If the transfer to the new method method call worked, a new walk * state was created -- get it */ WalkState = AcpiDsGetCurrentWalkState (Thread); continue; } else if (Status == AE_CTRL_TERMINATE) { Status = AE_OK; } else if ((Status != AE_OK) && (WalkState->MethodDesc)) { /* Either the method parse or actual execution failed */ ACPI_ERROR_METHOD ("Method parse/execution failed", WalkState->MethodNode, NULL, Status); /* Check for possible multi-thread reentrancy problem */ if ((Status == AE_ALREADY_EXISTS) && (!WalkState->MethodDesc->Method.Mutex)) { ACPI_INFO ((AE_INFO, "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error", WalkState->MethodNode->Name.Ascii)); /* * Method tried to create an object twice. The probable cause is * that the method cannot handle reentrancy. * * The method is marked NotSerialized, but it tried to create * a named object, causing the second thread entrance to fail. * Workaround this problem by marking the method permanently * as Serialized. */ WalkState->MethodDesc->Method.MethodFlags |= AML_METHOD_SERIALIZED; WalkState->MethodDesc->Method.SyncLevel = 0; } } /* We are done with this walk, move on to the parent if any */ WalkState = AcpiDsPopWalkState (Thread); /* Reset the current scope to the beginning of scope stack */ AcpiDsScopeStackClear (WalkState); /* * If we just returned from the execution of a control method or if we * encountered an error during the method parse phase, there's lots of * cleanup to do */ if (((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) == ACPI_PARSE_EXECUTE) || (ACPI_FAILURE (Status))) { AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState); } /* Delete this walk state and all linked control states */ AcpiPsCleanupScope (&WalkState->ParserState); PreviousWalkState = WalkState; ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "ReturnValue=%p, ImplicitValue=%p State=%p\n", WalkState->ReturnDesc, WalkState->ImplicitReturnObj, WalkState)); /* Check if we have restarted a preempted walk */ WalkState = AcpiDsGetCurrentWalkState (Thread); if (WalkState) { if (ACPI_SUCCESS (Status)) { /* * There is another walk state, restart it. * If the method return value is not used by the parent, * The object is deleted */ if (!PreviousWalkState->ReturnDesc) { /* * In slack mode execution, if there is no return value * we should implicitly return zero (0) as a default value. */ if (AcpiGbl_EnableInterpreterSlack && !PreviousWalkState->ImplicitReturnObj) { PreviousWalkState->ImplicitReturnObj = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); if (!PreviousWalkState->ImplicitReturnObj) { return_ACPI_STATUS (AE_NO_MEMORY); } PreviousWalkState->ImplicitReturnObj->Integer.Value = 0; } /* Restart the calling control method */ Status = AcpiDsRestartControlMethod (WalkState, PreviousWalkState->ImplicitReturnObj); } else { /* * We have a valid return value, delete any implicit * return value. */ AcpiDsClearImplicitReturn (PreviousWalkState); Status = AcpiDsRestartControlMethod (WalkState, PreviousWalkState->ReturnDesc); } if (ACPI_SUCCESS (Status)) { WalkState->WalkType |= ACPI_WALK_METHOD_RESTART; } } else { /* On error, delete any return object or implicit return */ AcpiUtRemoveReference (PreviousWalkState->ReturnDesc); AcpiDsClearImplicitReturn (PreviousWalkState); } } /* * Just completed a 1st-level method, save the final internal return * value (if any) */ else if (PreviousWalkState->CallerReturnDesc) { if (PreviousWalkState->ImplicitReturnObj) { *(PreviousWalkState->CallerReturnDesc) = PreviousWalkState->ImplicitReturnObj; } else { /* NULL if no return value */ *(PreviousWalkState->CallerReturnDesc) = PreviousWalkState->ReturnDesc; } } else { if (PreviousWalkState->ReturnDesc) { /* Caller doesn't want it, must delete it */ AcpiUtRemoveReference (PreviousWalkState->ReturnDesc); } if (PreviousWalkState->ImplicitReturnObj) { /* Caller doesn't want it, must delete it */ AcpiUtRemoveReference (PreviousWalkState->ImplicitReturnObj); } } AcpiDsDeleteWalkState (PreviousWalkState); } /* Normal exit */ AcpiExReleaseAllMutexes (Thread); AcpiUtDeleteGenericState (ACPI_CAST_PTR (ACPI_GENERIC_STATE, Thread)); AcpiGbl_CurrentWalkList = PrevWalkList; return_ACPI_STATUS (Status); }