| /****************************************************************************** |
| * |
| * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2016, 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. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * 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 "acinterp.h" |
| #include "amlcode.h" |
| #include "amlresrc.h" |
| |
| |
| #define _COMPONENT ACPI_EXECUTER |
| ACPI_MODULE_NAME ("exmisc") |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExGetObjectReference |
| * |
| * PARAMETERS: ObjDesc - Create a reference to this object |
| * ReturnDesc - Where to store the reference |
| * WalkState - Current state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Obtain and return a "reference" to the target object |
| * Common code for the RefOfOp and the CondRefOfOp. |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiExGetObjectReference ( |
| ACPI_OPERAND_OBJECT *ObjDesc, |
| ACPI_OPERAND_OBJECT **ReturnDesc, |
| ACPI_WALK_STATE *WalkState) |
| { |
| ACPI_OPERAND_OBJECT *ReferenceObj; |
| ACPI_OPERAND_OBJECT *ReferencedObj; |
| |
| |
| ACPI_FUNCTION_TRACE_PTR (ExGetObjectReference, ObjDesc); |
| |
| |
| *ReturnDesc = NULL; |
| |
| switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)) |
| { |
| case ACPI_DESC_TYPE_OPERAND: |
| |
| if (ObjDesc->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) |
| { |
| return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
| } |
| |
| /* |
| * Must be a reference to a Local or Arg |
| */ |
| switch (ObjDesc->Reference.Class) |
| { |
| case ACPI_REFCLASS_LOCAL: |
| case ACPI_REFCLASS_ARG: |
| case ACPI_REFCLASS_DEBUG: |
| |
| /* The referenced object is the pseudo-node for the local/arg */ |
| |
| ReferencedObj = ObjDesc->Reference.Object; |
| break; |
| |
| default: |
| |
| ACPI_ERROR ((AE_INFO, "Invalid Reference Class 0x%2.2X", |
| ObjDesc->Reference.Class)); |
| return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
| } |
| break; |
| |
| case ACPI_DESC_TYPE_NAMED: |
| /* |
| * A named reference that has already been resolved to a Node |
| */ |
| ReferencedObj = ObjDesc; |
| break; |
| |
| default: |
| |
| ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X", |
| ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))); |
| return_ACPI_STATUS (AE_TYPE); |
| } |
| |
| |
| /* Create a new reference object */ |
| |
| ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); |
| if (!ReferenceObj) |
| { |
| return_ACPI_STATUS (AE_NO_MEMORY); |
| } |
| |
| ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF; |
| ReferenceObj->Reference.Object = ReferencedObj; |
| *ReturnDesc = ReferenceObj; |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| "Object %p Type [%s], returning Reference %p\n", |
| ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc)); |
| |
| return_ACPI_STATUS (AE_OK); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExConcatTemplate |
| * |
| * PARAMETERS: Operand0 - First source object |
| * Operand1 - Second source object |
| * ActualReturnDesc - Where to place the return object |
| * WalkState - Current walk state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Concatenate two resource templates |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiExConcatTemplate ( |
| ACPI_OPERAND_OBJECT *Operand0, |
| ACPI_OPERAND_OBJECT *Operand1, |
| ACPI_OPERAND_OBJECT **ActualReturnDesc, |
| ACPI_WALK_STATE *WalkState) |
| { |
| ACPI_STATUS Status; |
| ACPI_OPERAND_OBJECT *ReturnDesc; |
| UINT8 *NewBuf; |
| UINT8 *EndTag; |
| ACPI_SIZE Length0; |
| ACPI_SIZE Length1; |
| ACPI_SIZE NewLength; |
| |
| |
| ACPI_FUNCTION_TRACE (ExConcatTemplate); |
| |
| |
| /* |
| * Find the EndTag descriptor in each resource template. |
| * Note1: returned pointers point TO the EndTag, not past it. |
| * Note2: zero-length buffers are allowed; treated like one EndTag |
| */ |
| |
| /* Get the length of the first resource template */ |
| |
| Status = AcpiUtGetResourceEndTag (Operand0, &EndTag); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| |
| Length0 = ACPI_PTR_DIFF (EndTag, Operand0->Buffer.Pointer); |
| |
| /* Get the length of the second resource template */ |
| |
| Status = AcpiUtGetResourceEndTag (Operand1, &EndTag); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| |
| Length1 = ACPI_PTR_DIFF (EndTag, Operand1->Buffer.Pointer); |
| |
| /* Combine both lengths, minimum size will be 2 for EndTag */ |
| |
| NewLength = Length0 + Length1 + sizeof (AML_RESOURCE_END_TAG); |
| |
| /* Create a new buffer object for the result (with one EndTag) */ |
| |
| ReturnDesc = AcpiUtCreateBufferObject (NewLength); |
| if (!ReturnDesc) |
| { |
| return_ACPI_STATUS (AE_NO_MEMORY); |
| } |
| |
| /* |
| * Copy the templates to the new buffer, 0 first, then 1 follows. One |
| * EndTag descriptor is copied from Operand1. |
| */ |
| NewBuf = ReturnDesc->Buffer.Pointer; |
| memcpy (NewBuf, Operand0->Buffer.Pointer, Length0); |
| memcpy (NewBuf + Length0, Operand1->Buffer.Pointer, Length1); |
| |
| /* Insert EndTag and set the checksum to zero, means "ignore checksum" */ |
| |
| NewBuf[NewLength - 1] = 0; |
| NewBuf[NewLength - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; |
| |
| /* Return the completed resource template */ |
| |
| *ActualReturnDesc = ReturnDesc; |
| return_ACPI_STATUS (AE_OK); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExDoConcatenate |
| * |
| * PARAMETERS: Operand0 - First source object |
| * Operand1 - Second source object |
| * ActualReturnDesc - Where to place the return object |
| * WalkState - Current walk state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiExDoConcatenate ( |
| ACPI_OPERAND_OBJECT *Operand0, |
| ACPI_OPERAND_OBJECT *Operand1, |
| ACPI_OPERAND_OBJECT **ActualReturnDesc, |
| ACPI_WALK_STATE *WalkState) |
| { |
| ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; |
| ACPI_OPERAND_OBJECT *ReturnDesc; |
| char *NewBuf; |
| const char *TypeString; |
| ACPI_STATUS Status; |
| |
| |
| ACPI_FUNCTION_TRACE (ExDoConcatenate); |
| |
| |
| /* |
| * Convert the second operand if necessary. The first operand |
| * determines the type of the second operand, (See the Data Types |
| * section of the ACPI specification.) Both object types are |
| * guaranteed to be either Integer/String/Buffer by the operand |
| * resolution mechanism. |
| */ |
| switch (Operand0->Common.Type) |
| { |
| case ACPI_TYPE_INTEGER: |
| |
| Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); |
| break; |
| |
| case ACPI_TYPE_STRING: |
| /* |
| * Per the ACPI spec, Concatenate only supports int/str/buf. |
| * However, we support all objects here as an extension. |
| * This improves the usefulness of the Printf() macro. |
| * 12/2015. |
| */ |
| switch (Operand1->Common.Type) |
| { |
| case ACPI_TYPE_INTEGER: |
| case ACPI_TYPE_STRING: |
| case ACPI_TYPE_BUFFER: |
| |
| Status = AcpiExConvertToString ( |
| Operand1, &LocalOperand1, ACPI_IMPLICIT_CONVERT_HEX); |
| break; |
| |
| default: |
| /* |
| * Just emit a string containing the object type. |
| */ |
| TypeString = AcpiUtGetTypeName (Operand1->Common.Type); |
| |
| LocalOperand1 = AcpiUtCreateStringObject ( |
| ((ACPI_SIZE) strlen (TypeString) + 9)); /* 9 For "[Object]" */ |
| if (!LocalOperand1) |
| { |
| Status = AE_NO_MEMORY; |
| goto Cleanup; |
| } |
| |
| strcpy (LocalOperand1->String.Pointer, "["); |
| strcat (LocalOperand1->String.Pointer, TypeString); |
| strcat (LocalOperand1->String.Pointer, " Object]"); |
| Status = AE_OK; |
| break; |
| } |
| break; |
| |
| case ACPI_TYPE_BUFFER: |
| |
| Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); |
| break; |
| |
| default: |
| |
| ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", |
| Operand0->Common.Type)); |
| Status = AE_AML_INTERNAL; |
| } |
| |
| if (ACPI_FAILURE (Status)) |
| { |
| goto Cleanup; |
| } |
| |
| /* |
| * Both operands are now known to be the same object type |
| * (Both are Integer, String, or Buffer), and we can now perform the |
| * concatenation. |
| */ |
| |
| /* |
| * There are three cases to handle: |
| * |
| * 1) Two Integers concatenated to produce a new Buffer |
| * 2) Two Strings concatenated to produce a new String |
| * 3) Two Buffers concatenated to produce a new Buffer |
| */ |
| switch (Operand0->Common.Type) |
| { |
| case ACPI_TYPE_INTEGER: |
| |
| /* Result of two Integers is a Buffer */ |
| /* Need enough buffer space for two integers */ |
| |
| ReturnDesc = AcpiUtCreateBufferObject ( |
| (ACPI_SIZE) ACPI_MUL_2 (AcpiGbl_IntegerByteWidth)); |
| if (!ReturnDesc) |
| { |
| Status = AE_NO_MEMORY; |
| goto Cleanup; |
| } |
| |
| NewBuf = (char *) ReturnDesc->Buffer.Pointer; |
| |
| /* Copy the first integer, LSB first */ |
| |
| memcpy (NewBuf, &Operand0->Integer.Value, |
| AcpiGbl_IntegerByteWidth); |
| |
| /* Copy the second integer (LSB first) after the first */ |
| |
| memcpy (NewBuf + AcpiGbl_IntegerByteWidth, |
| &LocalOperand1->Integer.Value, AcpiGbl_IntegerByteWidth); |
| break; |
| |
| case ACPI_TYPE_STRING: |
| |
| /* Result of two Strings is a String */ |
| |
| ReturnDesc = AcpiUtCreateStringObject ( |
| ((ACPI_SIZE) Operand0->String.Length + |
| LocalOperand1->String.Length)); |
| if (!ReturnDesc) |
| { |
| Status = AE_NO_MEMORY; |
| goto Cleanup; |
| } |
| |
| NewBuf = ReturnDesc->String.Pointer; |
| |
| /* Concatenate the strings */ |
| |
| strcpy (NewBuf, Operand0->String.Pointer); |
| strcat (NewBuf, LocalOperand1->String.Pointer); |
| break; |
| |
| case ACPI_TYPE_BUFFER: |
| |
| /* Result of two Buffers is a Buffer */ |
| |
| ReturnDesc = AcpiUtCreateBufferObject ( |
| ((ACPI_SIZE) Operand0->Buffer.Length + |
| LocalOperand1->Buffer.Length)); |
| if (!ReturnDesc) |
| { |
| Status = AE_NO_MEMORY; |
| goto Cleanup; |
| } |
| |
| NewBuf = (char *) ReturnDesc->Buffer.Pointer; |
| |
| /* Concatenate the buffers */ |
| |
| memcpy (NewBuf, Operand0->Buffer.Pointer, |
| Operand0->Buffer.Length); |
| memcpy (NewBuf + Operand0->Buffer.Length, |
| LocalOperand1->Buffer.Pointer, |
| LocalOperand1->Buffer.Length); |
| break; |
| |
| default: |
| |
| /* Invalid object type, should not happen here */ |
| |
| ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X", |
| Operand0->Common.Type)); |
| Status =AE_AML_INTERNAL; |
| goto Cleanup; |
| } |
| |
| *ActualReturnDesc = ReturnDesc; |
| |
| Cleanup: |
| if (LocalOperand1 != Operand1) |
| { |
| AcpiUtRemoveReference (LocalOperand1); |
| } |
| return_ACPI_STATUS (Status); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExDoMathOp |
| * |
| * PARAMETERS: Opcode - AML opcode |
| * Integer0 - Integer operand #0 |
| * Integer1 - Integer operand #1 |
| * |
| * RETURN: Integer result of the operation |
| * |
| * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the |
| * math functions here is to prevent a lot of pointer dereferencing |
| * to obtain the operands. |
| * |
| ******************************************************************************/ |
| |
| UINT64 |
| AcpiExDoMathOp ( |
| UINT16 Opcode, |
| UINT64 Integer0, |
| UINT64 Integer1) |
| { |
| |
| ACPI_FUNCTION_ENTRY (); |
| |
| |
| switch (Opcode) |
| { |
| case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ |
| |
| return (Integer0 + Integer1); |
| |
| case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ |
| |
| return (Integer0 & Integer1); |
| |
| case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ |
| |
| return (~(Integer0 & Integer1)); |
| |
| case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ |
| |
| return (Integer0 | Integer1); |
| |
| case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ |
| |
| return (~(Integer0 | Integer1)); |
| |
| case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ |
| |
| return (Integer0 ^ Integer1); |
| |
| case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ |
| |
| return (Integer0 * Integer1); |
| |
| case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/ |
| |
| /* |
| * We need to check if the shiftcount is larger than the integer bit |
| * width since the behavior of this is not well-defined in the C language. |
| */ |
| if (Integer1 >= AcpiGbl_IntegerBitWidth) |
| { |
| return (0); |
| } |
| return (Integer0 << Integer1); |
| |
| case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */ |
| |
| /* |
| * We need to check if the shiftcount is larger than the integer bit |
| * width since the behavior of this is not well-defined in the C language. |
| */ |
| if (Integer1 >= AcpiGbl_IntegerBitWidth) |
| { |
| return (0); |
| } |
| return (Integer0 >> Integer1); |
| |
| case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ |
| |
| return (Integer0 - Integer1); |
| |
| default: |
| |
| return (0); |
| } |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExDoLogicalNumericOp |
| * |
| * PARAMETERS: Opcode - AML opcode |
| * Integer0 - Integer operand #0 |
| * Integer1 - Integer operand #1 |
| * LogicalResult - TRUE/FALSE result of the operation |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric |
| * operators (LAnd and LOr), both operands must be integers. |
| * |
| * Note: cleanest machine code seems to be produced by the code |
| * below, rather than using statements of the form: |
| * Result = (Integer0 && Integer1); |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiExDoLogicalNumericOp ( |
| UINT16 Opcode, |
| UINT64 Integer0, |
| UINT64 Integer1, |
| BOOLEAN *LogicalResult) |
| { |
| ACPI_STATUS Status = AE_OK; |
| BOOLEAN LocalResult = FALSE; |
| |
| |
| ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp); |
| |
| |
| switch (Opcode) |
| { |
| case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ |
| |
| if (Integer0 && Integer1) |
| { |
| LocalResult = TRUE; |
| } |
| break; |
| |
| case AML_LOR_OP: /* LOr (Integer0, Integer1) */ |
| |
| if (Integer0 || Integer1) |
| { |
| LocalResult = TRUE; |
| } |
| break; |
| |
| default: |
| |
| Status = AE_AML_INTERNAL; |
| break; |
| } |
| |
| /* Return the logical result and status */ |
| |
| *LogicalResult = LocalResult; |
| return_ACPI_STATUS (Status); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExDoLogicalOp |
| * |
| * PARAMETERS: Opcode - AML opcode |
| * Operand0 - operand #0 |
| * Operand1 - operand #1 |
| * LogicalResult - TRUE/FALSE result of the operation |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the |
| * functions here is to prevent a lot of pointer dereferencing |
| * to obtain the operands and to simplify the generation of the |
| * logical value. For the Numeric operators (LAnd and LOr), both |
| * operands must be integers. For the other logical operators, |
| * operands can be any combination of Integer/String/Buffer. The |
| * first operand determines the type to which the second operand |
| * will be converted. |
| * |
| * Note: cleanest machine code seems to be produced by the code |
| * below, rather than using statements of the form: |
| * Result = (Operand0 == Operand1); |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiExDoLogicalOp ( |
| UINT16 Opcode, |
| ACPI_OPERAND_OBJECT *Operand0, |
| ACPI_OPERAND_OBJECT *Operand1, |
| BOOLEAN *LogicalResult) |
| { |
| ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1; |
| UINT64 Integer0; |
| UINT64 Integer1; |
| UINT32 Length0; |
| UINT32 Length1; |
| ACPI_STATUS Status = AE_OK; |
| BOOLEAN LocalResult = FALSE; |
| int Compare; |
| |
| |
| ACPI_FUNCTION_TRACE (ExDoLogicalOp); |
| |
| |
| /* |
| * Convert the second operand if necessary. The first operand |
| * determines the type of the second operand, (See the Data Types |
| * section of the ACPI 3.0+ specification.) Both object types are |
| * guaranteed to be either Integer/String/Buffer by the operand |
| * resolution mechanism. |
| */ |
| switch (Operand0->Common.Type) |
| { |
| case ACPI_TYPE_INTEGER: |
| |
| Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16); |
| break; |
| |
| case ACPI_TYPE_STRING: |
| |
| Status = AcpiExConvertToString ( |
| Operand1, &LocalOperand1, ACPI_IMPLICIT_CONVERT_HEX); |
| break; |
| |
| case ACPI_TYPE_BUFFER: |
| |
| Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1); |
| break; |
| |
| default: |
| |
| Status = AE_AML_INTERNAL; |
| break; |
| } |
| |
| if (ACPI_FAILURE (Status)) |
| { |
| goto Cleanup; |
| } |
| |
| /* |
| * Two cases: 1) Both Integers, 2) Both Strings or Buffers |
| */ |
| if (Operand0->Common.Type == ACPI_TYPE_INTEGER) |
| { |
| /* |
| * 1) Both operands are of type integer |
| * Note: LocalOperand1 may have changed above |
| */ |
| Integer0 = Operand0->Integer.Value; |
| Integer1 = LocalOperand1->Integer.Value; |
| |
| switch (Opcode) |
| { |
| case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ |
| |
| if (Integer0 == Integer1) |
| { |
| LocalResult = TRUE; |
| } |
| break; |
| |
| case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ |
| |
| if (Integer0 > Integer1) |
| { |
| LocalResult = TRUE; |
| } |
| break; |
| |
| case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ |
| |
| if (Integer0 < Integer1) |
| { |
| LocalResult = TRUE; |
| } |
| break; |
| |
| default: |
| |
| Status = AE_AML_INTERNAL; |
| break; |
| } |
| } |
| else |
| { |
| /* |
| * 2) Both operands are Strings or both are Buffers |
| * Note: Code below takes advantage of common Buffer/String |
| * object fields. LocalOperand1 may have changed above. Use |
| * memcmp to handle nulls in buffers. |
| */ |
| Length0 = Operand0->Buffer.Length; |
| Length1 = LocalOperand1->Buffer.Length; |
| |
| /* Lexicographic compare: compare the data bytes */ |
| |
| Compare = memcmp (Operand0->Buffer.Pointer, |
| LocalOperand1->Buffer.Pointer, |
| (Length0 > Length1) ? Length1 : Length0); |
| |
| switch (Opcode) |
| { |
| case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ |
| |
| /* Length and all bytes must be equal */ |
| |
| if ((Length0 == Length1) && |
| (Compare == 0)) |
| { |
| /* Length and all bytes match ==> TRUE */ |
| |
| LocalResult = TRUE; |
| } |
| break; |
| |
| case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ |
| |
| if (Compare > 0) |
| { |
| LocalResult = TRUE; |
| goto Cleanup; /* TRUE */ |
| } |
| if (Compare < 0) |
| { |
| goto Cleanup; /* FALSE */ |
| } |
| |
| /* Bytes match (to shortest length), compare lengths */ |
| |
| if (Length0 > Length1) |
| { |
| LocalResult = TRUE; |
| } |
| break; |
| |
| case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ |
| |
| if (Compare > 0) |
| { |
| goto Cleanup; /* FALSE */ |
| } |
| if (Compare < 0) |
| { |
| LocalResult = TRUE; |
| goto Cleanup; /* TRUE */ |
| } |
| |
| /* Bytes match (to shortest length), compare lengths */ |
| |
| if (Length0 < Length1) |
| { |
| LocalResult = TRUE; |
| } |
| break; |
| |
| default: |
| |
| Status = AE_AML_INTERNAL; |
| break; |
| } |
| } |
| |
| Cleanup: |
| |
| /* New object was created if implicit conversion performed - delete */ |
| |
| if (LocalOperand1 != Operand1) |
| { |
| AcpiUtRemoveReference (LocalOperand1); |
| } |
| |
| /* Return the logical result and status */ |
| |
| *LogicalResult = LocalResult; |
| return_ACPI_STATUS (Status); |
| } |
