/****************************************************************************** * * Module Name: exoparg1 - AML execution - opcodes with 1 argument * $Revision: 147 $ * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2003, 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. * *****************************************************************************/ /* $DragonFly: src/sys/contrib/dev/acpica/Attic/exoparg1.c,v 1.1 2003/09/24 03:32:16 drhodus Exp $ */ #define __EXOPARG1_C__ #include "acpi.h" #include "acparser.h" #include "acdispat.h" #include "acinterp.h" #include "amlcode.h" #include "acnamesp.h" #define _COMPONENT ACPI_EXECUTER ACPI_MODULE_NAME ("exoparg1") /*! * Naming convention for AML interpreter execution routines. * * The routines that begin execution of AML opcodes are named with a common * convention based upon the number of arguments, the number of target operands, * and whether or not a value is returned: * * AcpiExOpcode_xA_yT_zR * * Where: * * xA - ARGUMENTS: The number of arguments (input operands) that are * required for this opcode type (1 through 6 args). * yT - TARGETS: The number of targets (output operands) that are required * for this opcode type (0, 1, or 2 targets). * zR - RETURN VALUE: Indicates whether this opcode type returns a value * as the function return (0 or 1). * * The AcpiExOpcode* functions are called via the Dispatcher component with * fully resolved operands. !*/ /******************************************************************************* * * FUNCTION: AcpiExOpcode_1A_0T_0R * * PARAMETERS: WalkState - Current state (contains AML opcode) * * RETURN: Status * * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on * object stack * ******************************************************************************/ ACPI_STATUS AcpiExOpcode_1A_0T_0R ( ACPI_WALK_STATE *WalkState) { ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; ACPI_STATUS Status = AE_OK; ACPI_FUNCTION_TRACE_STR ("ExOpcode_1A_0T_0R", AcpiPsGetOpcodeName (WalkState->Opcode)); /* Examine the AML opcode */ switch (WalkState->Opcode) { case AML_RELEASE_OP: /* Release (MutexObject) */ Status = AcpiExReleaseMutex (Operand[0], WalkState); break; case AML_RESET_OP: /* Reset (EventObject) */ Status = AcpiExSystemResetEvent (Operand[0]); break; case AML_SIGNAL_OP: /* Signal (EventObject) */ Status = AcpiExSystemSignalEvent (Operand[0]); break; case AML_SLEEP_OP: /* Sleep (MsecTime) */ Status = AcpiExSystemDoSuspend ((UINT32) Operand[0]->Integer.Value); break; case AML_STALL_OP: /* Stall (UsecTime) */ Status = AcpiExSystemDoStall ((UINT32) Operand[0]->Integer.Value); break; case AML_UNLOAD_OP: /* Unload (Handle) */ Status = AcpiExUnloadTable (Operand[0]); break; default: /* Unknown opcode */ ACPI_REPORT_ERROR (("AcpiExOpcode_1A_0T_0R: Unknown opcode %X\n", WalkState->Opcode)); Status = AE_AML_BAD_OPCODE; break; } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExOpcode_1A_1T_0R * * PARAMETERS: WalkState - Current state (contains AML opcode) * * RETURN: Status * * DESCRIPTION: Execute opcode with one argument, one target, and no * return value. * ******************************************************************************/ ACPI_STATUS AcpiExOpcode_1A_1T_0R ( ACPI_WALK_STATE *WalkState) { ACPI_STATUS Status = AE_OK; ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; ACPI_FUNCTION_TRACE_STR ("ExOpcode_1A_1T_0R", AcpiPsGetOpcodeName (WalkState->Opcode)); /* Examine the AML opcode */ switch (WalkState->Opcode) { case AML_LOAD_OP: Status = AcpiExLoadOp (Operand[0], Operand[1], WalkState); break; default: /* Unknown opcode */ ACPI_REPORT_ERROR (("AcpiExOpcode_1A_1T_0R: Unknown opcode %X\n", WalkState->Opcode)); Status = AE_AML_BAD_OPCODE; goto Cleanup; } Cleanup: return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExOpcode_1A_1T_1R * * PARAMETERS: WalkState - Current state (contains AML opcode) * * RETURN: Status * * DESCRIPTION: Execute opcode with one argument, one target, and a * return value. * ******************************************************************************/ ACPI_STATUS AcpiExOpcode_1A_1T_1R ( ACPI_WALK_STATE *WalkState) { ACPI_STATUS Status = AE_OK; ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; ACPI_OPERAND_OBJECT *ReturnDesc = NULL; ACPI_OPERAND_OBJECT *ReturnDesc2 = NULL; UINT32 Temp32; UINT32 i; UINT32 j; ACPI_INTEGER Digit; ACPI_FUNCTION_TRACE_STR ("ExOpcode_1A_1T_1R", AcpiPsGetOpcodeName (WalkState->Opcode)); /* Examine the AML opcode */ switch (WalkState->Opcode) { case AML_BIT_NOT_OP: case AML_FIND_SET_LEFT_BIT_OP: case AML_FIND_SET_RIGHT_BIT_OP: case AML_FROM_BCD_OP: case AML_TO_BCD_OP: case AML_COND_REF_OF_OP: /* Create a return object of type Integer for these opcodes */ ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); if (!ReturnDesc) { Status = AE_NO_MEMORY; goto Cleanup; } switch (WalkState->Opcode) { case AML_BIT_NOT_OP: /* Not (Operand, Result) */ ReturnDesc->Integer.Value = ~Operand[0]->Integer.Value; break; case AML_FIND_SET_LEFT_BIT_OP: /* FindSetLeftBit (Operand, Result) */ ReturnDesc->Integer.Value = Operand[0]->Integer.Value; /* * Acpi specification describes Integer type as a little * endian unsigned value, so this boundary condition is valid. */ for (Temp32 = 0; ReturnDesc->Integer.Value && Temp32 < ACPI_INTEGER_BIT_SIZE; ++Temp32) { ReturnDesc->Integer.Value >>= 1; } ReturnDesc->Integer.Value = Temp32; break; case AML_FIND_SET_RIGHT_BIT_OP: /* FindSetRightBit (Operand, Result) */ ReturnDesc->Integer.Value = Operand[0]->Integer.Value; /* * The Acpi specification describes Integer type as a little * endian unsigned value, so this boundary condition is valid. */ for (Temp32 = 0; ReturnDesc->Integer.Value && Temp32 < ACPI_INTEGER_BIT_SIZE; ++Temp32) { ReturnDesc->Integer.Value <<= 1; } /* Since the bit position is one-based, subtract from 33 (65) */ ReturnDesc->Integer.Value = Temp32 == 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - Temp32; break; case AML_FROM_BCD_OP: /* FromBcd (BCDValue, Result) */ /* * The 64-bit ACPI integer can hold 16 4-bit BCD integers */ ReturnDesc->Integer.Value = 0; for (i = 0; i < ACPI_MAX_BCD_DIGITS; i++) { /* Get one BCD digit */ Digit = (ACPI_INTEGER) ((Operand[0]->Integer.Value >> (i * 4)) & 0xF); /* Check the range of the digit */ if (Digit > 9) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "BCD digit too large: %d\n", (UINT32) Digit)); Status = AE_AML_NUMERIC_OVERFLOW; goto Cleanup; } if (Digit > 0) { /* Sum into the result with the appropriate power of 10 */ for (j = 0; j < i; j++) { Digit *= 10; } ReturnDesc->Integer.Value += Digit; } } break; case AML_TO_BCD_OP: /* ToBcd (Operand, Result) */ if (Operand[0]->Integer.Value > ACPI_MAX_BCD_VALUE) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "BCD overflow: %8.8X%8.8X\n", ACPI_HIDWORD(Operand[0]->Integer.Value), ACPI_LODWORD(Operand[0]->Integer.Value))); Status = AE_AML_NUMERIC_OVERFLOW; goto Cleanup; } ReturnDesc->Integer.Value = 0; for (i = 0; i < ACPI_MAX_BCD_DIGITS; i++) { /* Divide by nth factor of 10 */ Temp32 = 0; Digit = Operand[0]->Integer.Value; for (j = 0; j < i; j++) { (void) AcpiUtShortDivide (&Digit, 10, &Digit, &Temp32); } /* Create the BCD digit from the remainder above */ if (Digit > 0) { ReturnDesc->Integer.Value += ((ACPI_INTEGER) Temp32 << (i * 4)); } } break; case AML_COND_REF_OF_OP: /* CondRefOf (SourceObject, Result) */ /* * This op is a little strange because the internal return value is * different than the return value stored in the result descriptor * (There are really two return values) */ if ((ACPI_NAMESPACE_NODE *) Operand[0] == AcpiGbl_RootNode) { /* * This means that the object does not exist in the namespace, * return FALSE */ ReturnDesc->Integer.Value = 0; goto Cleanup; } /* Get the object reference, store it, and remove our reference */ Status = AcpiExGetObjectReference (Operand[0], &ReturnDesc2, WalkState); if (ACPI_FAILURE (Status)) { goto Cleanup; } Status = AcpiExStore (ReturnDesc2, Operand[1], WalkState); AcpiUtRemoveReference (ReturnDesc2); /* The object exists in the namespace, return TRUE */ ReturnDesc->Integer.Value = ACPI_INTEGER_MAX; goto Cleanup; default: /* No other opcodes get here */ break; } break; case AML_STORE_OP: /* Store (Source, Target) */ /* * A store operand is typically a number, string, buffer or lvalue * Be careful about deleting the source object, * since the object itself may have been stored. */ Status = AcpiExStore (Operand[0], Operand[1], WalkState); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* It is possible that the Store already produced a return object */ if (!WalkState->ResultObj) { /* * Normally, we would remove a reference on the Operand[0] parameter; * But since it is being used as the internal return object * (meaning we would normally increment it), the two cancel out, * and we simply don't do anything. */ WalkState->ResultObj = Operand[0]; WalkState->Operands[0] = NULL; /* Prevent deletion */ } return_ACPI_STATUS (Status); /* * ACPI 2.0 Opcodes */ case AML_COPY_OP: /* Copy (Source, Target) */ Status = AcpiUtCopyIobjectToIobject (Operand[0], &ReturnDesc, WalkState); break; case AML_TO_DECSTRING_OP: /* ToDecimalString (Data, Result) */ Status = AcpiExConvertToString (Operand[0], &ReturnDesc, 10, ACPI_UINT32_MAX, WalkState); break; case AML_TO_HEXSTRING_OP: /* ToHexString (Data, Result) */ Status = AcpiExConvertToString (Operand[0], &ReturnDesc, 16, ACPI_UINT32_MAX, WalkState); break; case AML_TO_BUFFER_OP: /* ToBuffer (Data, Result) */ Status = AcpiExConvertToBuffer (Operand[0], &ReturnDesc, WalkState); break; case AML_TO_INTEGER_OP: /* ToInteger (Data, Result) */ Status = AcpiExConvertToInteger (Operand[0], &ReturnDesc, WalkState); break; case AML_SHIFT_LEFT_BIT_OP: /* ShiftLeftBit (Source, BitNum) */ case AML_SHIFT_RIGHT_BIT_OP: /* ShiftRightBit (Source, BitNum) */ /* * These are two obsolete opcodes */ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s is obsolete and not implemented\n", AcpiPsGetOpcodeName (WalkState->Opcode))); Status = AE_SUPPORT; goto Cleanup; default: /* Unknown opcode */ ACPI_REPORT_ERROR (("AcpiExOpcode_1A_1T_1R: Unknown opcode %X\n", WalkState->Opcode)); Status = AE_AML_BAD_OPCODE; goto Cleanup; } /* * Store the return value computed above into the target object */ Status = AcpiExStore (ReturnDesc, Operand[1], WalkState); Cleanup: if (!WalkState->ResultObj) { WalkState->ResultObj = ReturnDesc; } /* Delete return object on error */ if (ACPI_FAILURE (Status)) { AcpiUtRemoveReference (ReturnDesc); } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExOpcode_1A_0T_1R * * PARAMETERS: WalkState - Current state (contains AML opcode) * * RETURN: Status * * DESCRIPTION: Execute opcode with one argument, no target, and a return value * ******************************************************************************/ ACPI_STATUS AcpiExOpcode_1A_0T_1R ( ACPI_WALK_STATE *WalkState) { ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; ACPI_OPERAND_OBJECT *TempDesc; ACPI_OPERAND_OBJECT *ReturnDesc = NULL; ACPI_STATUS Status = AE_OK; UINT32 Type; ACPI_INTEGER Value; ACPI_FUNCTION_TRACE_STR ("ExOpcode_1A_0T_0R", AcpiPsGetOpcodeName (WalkState->Opcode)); /* Examine the AML opcode */ switch (WalkState->Opcode) { case AML_LNOT_OP: /* LNot (Operand) */ ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); if (!ReturnDesc) { Status = AE_NO_MEMORY; goto Cleanup; } ReturnDesc->Integer.Value = !Operand[0]->Integer.Value; break; case AML_DECREMENT_OP: /* Decrement (Operand) */ case AML_INCREMENT_OP: /* Increment (Operand) */ /* * Since we are expecting a Reference operand, it * can be either a NS Node or an internal object. */ ReturnDesc = Operand[0]; if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) == ACPI_DESC_TYPE_OPERAND) { /* Internal reference object - prevent deletion */ AcpiUtAddReference (ReturnDesc); } /* * Convert the ReturnDesc Reference to a Number * (This removes a reference on the ReturnDesc object) */ Status = AcpiExResolveOperands (AML_LNOT_OP, &ReturnDesc, WalkState); if (ACPI_FAILURE (Status)) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s: bad operand(s) %s\n", AcpiPsGetOpcodeName (WalkState->Opcode), AcpiFormatException(Status))); goto Cleanup; } /* * ReturnDesc is now guaranteed to be an Integer object * Do the actual increment or decrement */ if (AML_INCREMENT_OP == WalkState->Opcode) { ReturnDesc->Integer.Value++; } else { ReturnDesc->Integer.Value--; } /* Store the result back in the original descriptor */ Status = AcpiExStore (ReturnDesc, Operand[0], WalkState); break; case AML_TYPE_OP: /* ObjectType (SourceObject) */ /* Get the type of the base object */ Status = AcpiExResolveMultiple (WalkState, Operand[0], &Type, NULL); if (ACPI_FAILURE (Status)) { goto Cleanup; } /* Allocate a descriptor to hold the type. */ ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); if (!ReturnDesc) { Status = AE_NO_MEMORY; goto Cleanup; } ReturnDesc->Integer.Value = Type; break; case AML_SIZE_OF_OP: /* SizeOf (SourceObject) */ /* Get the base object */ Status = AcpiExResolveMultiple (WalkState, Operand[0], &Type, &TempDesc); if (ACPI_FAILURE (Status)) { goto Cleanup; } /* * Type is guaranteed to be a buffer, string, or package at this * point (even if the original operand was an object reference, it * will be resolved and typechecked during operand resolution.) */ switch (Type) { case ACPI_TYPE_BUFFER: Value = TempDesc->Buffer.Length; break; case ACPI_TYPE_STRING: Value = TempDesc->String.Length; break; case ACPI_TYPE_PACKAGE: Value = TempDesc->Package.Count; break; default: ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "SizeOf, Not Buf/Str/Pkg - found type %s\n", AcpiUtGetTypeName (Type))); Status = AE_AML_OPERAND_TYPE; goto Cleanup; } /* * Now that we have the size of the object, create a result * object to hold the value */ ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); if (!ReturnDesc) { Status = AE_NO_MEMORY; goto Cleanup; } ReturnDesc->Integer.Value = Value; break; case AML_REF_OF_OP: /* RefOf (SourceObject) */ Status = AcpiExGetObjectReference (Operand[0], &ReturnDesc, WalkState); if (ACPI_FAILURE (Status)) { goto Cleanup; } break; case AML_DEREF_OF_OP: /* DerefOf (ObjReference | String) */ /* Check for a method local or argument, or standalone String */ if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) != ACPI_DESC_TYPE_NAMED) { switch (ACPI_GET_OBJECT_TYPE (Operand[0])) { case ACPI_TYPE_LOCAL_REFERENCE: /* * This is a DerefOf (LocalX | ArgX) * * Must resolve/dereference the local/arg reference first */ switch (Operand[0]->Reference.Opcode) { case AML_LOCAL_OP: case AML_ARG_OP: /* Set Operand[0] to the value of the local/arg */ Status = AcpiDsMethodDataGetValue (Operand[0]->Reference.Opcode, Operand[0]->Reference.Offset, WalkState, &TempDesc); if (ACPI_FAILURE (Status)) { goto Cleanup; } /* * Delete our reference to the input object and * point to the object just retrieved */ AcpiUtRemoveReference (Operand[0]); Operand[0] = TempDesc; break; case AML_REF_OF_OP: /* Get the object to which the reference refers */ TempDesc = Operand[0]->Reference.Object; AcpiUtRemoveReference (Operand[0]); Operand[0] = TempDesc; break; default: /* Must be an Index op - handled below */ break; } break; case ACPI_TYPE_STRING: /* * This is a DerefOf (String). The string is a reference to a named ACPI object. * * 1) Find the owning Node * 2) Dereference the node to an actual object. Could be a Field, so we nee * to resolve the node to a value. */ Status = AcpiNsGetNodeByPath (Operand[0]->String.Pointer, WalkState->ScopeInfo->Scope.Node, ACPI_NS_SEARCH_PARENT, ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &ReturnDesc)); if (ACPI_FAILURE (Status)) { goto Cleanup; } Status = AcpiExResolveNodeToValue ( ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &ReturnDesc), WalkState); goto Cleanup; default: Status = AE_AML_OPERAND_TYPE; goto Cleanup; } } /* Operand[0] may have changed from the code above */ if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) == ACPI_DESC_TYPE_NAMED) { /* * This is a DerefOf (ObjectReference) * Get the actual object from the Node (This is the dereference). * -- This case may only happen when a LocalX or ArgX is dereferenced above. */ ReturnDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) Operand[0]); } else { /* * This must be a reference object produced by either the Index() or * RefOf() operator */ switch (Operand[0]->Reference.Opcode) { case AML_INDEX_OP: /* * The target type for the Index operator must be * either a Buffer or a Package */ switch (Operand[0]->Reference.TargetType) { case ACPI_TYPE_BUFFER_FIELD: TempDesc = Operand[0]->Reference.Object; /* * Create a new object that contains one element of the * buffer -- the element pointed to by the index. * * NOTE: index into a buffer is NOT a pointer to a * sub-buffer of the main buffer, it is only a pointer to a * single element (byte) of the buffer! */ ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); if (!ReturnDesc) { Status = AE_NO_MEMORY; goto Cleanup; } /* * Since we are returning the value of the buffer at the * indexed location, we don't need to add an additional * reference to the buffer itself. */ ReturnDesc->Integer.Value = TempDesc->Buffer.Pointer[Operand[0]->Reference.Offset]; break; case ACPI_TYPE_PACKAGE: /* * Return the referenced element of the package. We must add * another reference to the referenced object, however. */ ReturnDesc = *(Operand[0]->Reference.Where); if (!ReturnDesc) { /* * We can't return a NULL dereferenced value. This is * an uninitialized package element and is thus a * severe error. */ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "NULL package element obj %p\n", Operand[0])); Status = AE_AML_UNINITIALIZED_ELEMENT; goto Cleanup; } AcpiUtAddReference (ReturnDesc); break; default: ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Index TargetType %X in obj %p\n", Operand[0]->Reference.TargetType, Operand[0])); Status = AE_AML_OPERAND_TYPE; goto Cleanup; } break; case AML_REF_OF_OP: ReturnDesc = Operand[0]->Reference.Object; if (ACPI_GET_DESCRIPTOR_TYPE (ReturnDesc) == ACPI_DESC_TYPE_NAMED) { ReturnDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ReturnDesc); } /* Add another reference to the object! */ AcpiUtAddReference (ReturnDesc); break; default: ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown opcode in ref(%p) - %X\n", Operand[0], Operand[0]->Reference.Opcode)); Status = AE_TYPE; goto Cleanup; } } break; default: ACPI_REPORT_ERROR (("AcpiExOpcode_1A_0T_1R: Unknown opcode %X\n", WalkState->Opcode)); Status = AE_AML_BAD_OPCODE; goto Cleanup; } Cleanup: /* Delete return object on error */ if (ACPI_FAILURE (Status)) { AcpiUtRemoveReference (ReturnDesc); } WalkState->ResultObj = ReturnDesc; return_ACPI_STATUS (Status); }