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534 lines
15 KiB
C
534 lines
15 KiB
C
/******************************************************************************
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*
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* Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2017, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "acinterp.h"
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#include "amlcode.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exmisc")
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/*******************************************************************************
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*
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* FUNCTION: AcpiExGetObjectReference
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*
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* PARAMETERS: ObjDesc - Create a reference to this object
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* ReturnDesc - Where to store the reference
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* WalkState - Current state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Obtain and return a "reference" to the target object
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* Common code for the RefOfOp and the CondRefOfOp.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExGetObjectReference (
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ACPI_OPERAND_OBJECT *ObjDesc,
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ACPI_OPERAND_OBJECT **ReturnDesc,
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ACPI_WALK_STATE *WalkState)
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{
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ACPI_OPERAND_OBJECT *ReferenceObj;
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ACPI_OPERAND_OBJECT *ReferencedObj;
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ACPI_FUNCTION_TRACE_PTR (ExGetObjectReference, ObjDesc);
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*ReturnDesc = NULL;
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switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
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{
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case ACPI_DESC_TYPE_OPERAND:
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if (ObjDesc->Common.Type != ACPI_TYPE_LOCAL_REFERENCE)
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{
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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/*
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* Must be a reference to a Local or Arg
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*/
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switch (ObjDesc->Reference.Class)
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{
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case ACPI_REFCLASS_LOCAL:
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case ACPI_REFCLASS_ARG:
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case ACPI_REFCLASS_DEBUG:
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/* The referenced object is the pseudo-node for the local/arg */
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ReferencedObj = ObjDesc->Reference.Object;
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break;
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default:
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ACPI_ERROR ((AE_INFO, "Invalid Reference Class 0x%2.2X",
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ObjDesc->Reference.Class));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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break;
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case ACPI_DESC_TYPE_NAMED:
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/*
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* A named reference that has already been resolved to a Node
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*/
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ReferencedObj = ObjDesc;
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break;
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default:
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ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X",
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ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)));
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return_ACPI_STATUS (AE_TYPE);
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}
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/* Create a new reference object */
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ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE);
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if (!ReferenceObj)
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{
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF;
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ReferenceObj->Reference.Object = ReferencedObj;
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*ReturnDesc = ReferenceObj;
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
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"Object %p Type [%s], returning Reference %p\n",
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ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc));
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExDoMathOp
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*
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* PARAMETERS: Opcode - AML opcode
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* Integer0 - Integer operand #0
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* Integer1 - Integer operand #1
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*
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* RETURN: Integer result of the operation
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*
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* DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
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* math functions here is to prevent a lot of pointer dereferencing
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* to obtain the operands.
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*
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******************************************************************************/
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UINT64
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AcpiExDoMathOp (
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UINT16 Opcode,
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UINT64 Integer0,
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UINT64 Integer1)
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{
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ACPI_FUNCTION_ENTRY ();
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switch (Opcode)
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{
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case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */
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return (Integer0 + Integer1);
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case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */
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return (Integer0 & Integer1);
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case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */
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return (~(Integer0 & Integer1));
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case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */
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return (Integer0 | Integer1);
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case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */
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return (~(Integer0 | Integer1));
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case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */
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return (Integer0 ^ Integer1);
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case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */
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return (Integer0 * Integer1);
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case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/
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/*
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* We need to check if the shiftcount is larger than the integer bit
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* width since the behavior of this is not well-defined in the C language.
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*/
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if (Integer1 >= AcpiGbl_IntegerBitWidth)
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{
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return (0);
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}
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return (Integer0 << Integer1);
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case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */
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/*
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* We need to check if the shiftcount is larger than the integer bit
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* width since the behavior of this is not well-defined in the C language.
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*/
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if (Integer1 >= AcpiGbl_IntegerBitWidth)
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{
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return (0);
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}
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return (Integer0 >> Integer1);
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case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */
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return (Integer0 - Integer1);
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default:
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return (0);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExDoLogicalNumericOp
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*
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* PARAMETERS: Opcode - AML opcode
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* Integer0 - Integer operand #0
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* Integer1 - Integer operand #1
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* LogicalResult - TRUE/FALSE result of the operation
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
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* operators (LAnd and LOr), both operands must be integers.
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*
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* Note: cleanest machine code seems to be produced by the code
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* below, rather than using statements of the form:
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* Result = (Integer0 && Integer1);
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExDoLogicalNumericOp (
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UINT16 Opcode,
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UINT64 Integer0,
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UINT64 Integer1,
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BOOLEAN *LogicalResult)
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{
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ACPI_STATUS Status = AE_OK;
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BOOLEAN LocalResult = FALSE;
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ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp);
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switch (Opcode)
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{
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case AML_LOGICAL_AND_OP: /* LAnd (Integer0, Integer1) */
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if (Integer0 && Integer1)
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{
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LocalResult = TRUE;
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}
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break;
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case AML_LOGICAL_OR_OP: /* LOr (Integer0, Integer1) */
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if (Integer0 || Integer1)
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{
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LocalResult = TRUE;
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}
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break;
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default:
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ACPI_ERROR ((AE_INFO,
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"Invalid numeric logical opcode: %X", Opcode));
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Status = AE_AML_INTERNAL;
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break;
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}
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/* Return the logical result and status */
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*LogicalResult = LocalResult;
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExDoLogicalOp
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*
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* PARAMETERS: Opcode - AML opcode
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* Operand0 - operand #0
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* Operand1 - operand #1
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* LogicalResult - TRUE/FALSE result of the operation
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
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* functions here is to prevent a lot of pointer dereferencing
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* to obtain the operands and to simplify the generation of the
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* logical value. For the Numeric operators (LAnd and LOr), both
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* operands must be integers. For the other logical operators,
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* operands can be any combination of Integer/String/Buffer. The
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* first operand determines the type to which the second operand
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* will be converted.
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*
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* Note: cleanest machine code seems to be produced by the code
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* below, rather than using statements of the form:
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* Result = (Operand0 == Operand1);
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExDoLogicalOp (
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UINT16 Opcode,
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ACPI_OPERAND_OBJECT *Operand0,
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ACPI_OPERAND_OBJECT *Operand1,
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BOOLEAN *LogicalResult)
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{
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ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1;
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UINT64 Integer0;
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UINT64 Integer1;
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UINT32 Length0;
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UINT32 Length1;
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ACPI_STATUS Status = AE_OK;
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BOOLEAN LocalResult = FALSE;
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int Compare;
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ACPI_FUNCTION_TRACE (ExDoLogicalOp);
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/*
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* Convert the second operand if necessary. The first operand
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* determines the type of the second operand, (See the Data Types
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* section of the ACPI 3.0+ specification.) Both object types are
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* guaranteed to be either Integer/String/Buffer by the operand
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* resolution mechanism.
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*/
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switch (Operand0->Common.Type)
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{
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case ACPI_TYPE_INTEGER:
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Status = AcpiExConvertToInteger (Operand1, &LocalOperand1,
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ACPI_STRTOUL_BASE16);
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break;
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case ACPI_TYPE_STRING:
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Status = AcpiExConvertToString (
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Operand1, &LocalOperand1, ACPI_IMPLICIT_CONVERT_HEX);
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break;
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case ACPI_TYPE_BUFFER:
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Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1);
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break;
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default:
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ACPI_ERROR ((AE_INFO,
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"Invalid object type for logical operator: %X",
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Operand0->Common.Type));
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Status = AE_AML_INTERNAL;
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break;
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}
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if (ACPI_FAILURE (Status))
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{
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goto Cleanup;
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}
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/*
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* Two cases: 1) Both Integers, 2) Both Strings or Buffers
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*/
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if (Operand0->Common.Type == ACPI_TYPE_INTEGER)
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{
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/*
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* 1) Both operands are of type integer
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* Note: LocalOperand1 may have changed above
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*/
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Integer0 = Operand0->Integer.Value;
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Integer1 = LocalOperand1->Integer.Value;
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switch (Opcode)
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{
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case AML_LOGICAL_EQUAL_OP: /* LEqual (Operand0, Operand1) */
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if (Integer0 == Integer1)
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{
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LocalResult = TRUE;
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}
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break;
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case AML_LOGICAL_GREATER_OP: /* LGreater (Operand0, Operand1) */
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if (Integer0 > Integer1)
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{
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LocalResult = TRUE;
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}
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break;
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case AML_LOGICAL_LESS_OP: /* LLess (Operand0, Operand1) */
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if (Integer0 < Integer1)
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{
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LocalResult = TRUE;
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}
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break;
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default:
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ACPI_ERROR ((AE_INFO,
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"Invalid comparison opcode: %X", Opcode));
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Status = AE_AML_INTERNAL;
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break;
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}
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}
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else
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{
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/*
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* 2) Both operands are Strings or both are Buffers
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* Note: Code below takes advantage of common Buffer/String
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* object fields. LocalOperand1 may have changed above. Use
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* memcmp to handle nulls in buffers.
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*/
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Length0 = Operand0->Buffer.Length;
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Length1 = LocalOperand1->Buffer.Length;
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/* Lexicographic compare: compare the data bytes */
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Compare = memcmp (Operand0->Buffer.Pointer,
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LocalOperand1->Buffer.Pointer,
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(Length0 > Length1) ? Length1 : Length0);
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switch (Opcode)
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{
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case AML_LOGICAL_EQUAL_OP: /* LEqual (Operand0, Operand1) */
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/* Length and all bytes must be equal */
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if ((Length0 == Length1) &&
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(Compare == 0))
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{
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/* Length and all bytes match ==> TRUE */
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LocalResult = TRUE;
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}
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break;
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case AML_LOGICAL_GREATER_OP: /* LGreater (Operand0, Operand1) */
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if (Compare > 0)
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{
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LocalResult = TRUE;
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goto Cleanup; /* TRUE */
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}
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if (Compare < 0)
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{
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goto Cleanup; /* FALSE */
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}
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/* Bytes match (to shortest length), compare lengths */
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if (Length0 > Length1)
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{
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LocalResult = TRUE;
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}
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break;
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case AML_LOGICAL_LESS_OP: /* LLess (Operand0, Operand1) */
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if (Compare > 0)
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{
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goto Cleanup; /* FALSE */
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}
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if (Compare < 0)
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{
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LocalResult = TRUE;
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goto Cleanup; /* TRUE */
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}
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/* Bytes match (to shortest length), compare lengths */
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if (Length0 < Length1)
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{
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LocalResult = TRUE;
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}
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break;
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default:
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ACPI_ERROR ((AE_INFO,
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"Invalid comparison opcode: %X", Opcode));
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Status = AE_AML_INTERNAL;
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break;
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}
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}
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Cleanup:
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/* New object was created if implicit conversion performed - delete */
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if (LocalOperand1 != Operand1)
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{
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AcpiUtRemoveReference (LocalOperand1);
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}
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/* Return the logical result and status */
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*LogicalResult = LocalResult;
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return_ACPI_STATUS (Status);
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}
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