533 lines
15 KiB
C
533 lines
15 KiB
C
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/******************************************************************************
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*
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* Module Name: exutils - interpreter/scanner utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2012, 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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#define __EXUTILS_C__
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/*
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* DEFINE_AML_GLOBALS is tested in amlcode.h
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* to determine whether certain global names should be "defined" or only
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* "declared" in the current compilation. This enhances maintainability
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* by enabling a single header file to embody all knowledge of the names
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* in question.
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*
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* Exactly one module of any executable should #define DEFINE_GLOBALS
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* before #including the header files which use this convention. The
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* names in question will be defined and initialized in that module,
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* and declared as extern in all other modules which #include those
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* header files.
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*/
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#define DEFINE_AML_GLOBALS
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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 ("exutils")
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/* Local prototypes */
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static UINT32
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AcpiExDigitsNeeded (
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UINT64 Value,
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UINT32 Base);
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#ifndef ACPI_NO_METHOD_EXECUTION
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/*******************************************************************************
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*
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* FUNCTION: AcpiExEnterInterpreter
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*
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* PARAMETERS: None
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*
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* RETURN: None
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*
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* DESCRIPTION: Enter the interpreter execution region. Failure to enter
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* the interpreter region is a fatal system error. Used in
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* conjunction with ExitInterpreter.
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*
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******************************************************************************/
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void
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AcpiExEnterInterpreter (
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void)
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{
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (ExEnterInterpreter);
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Status = AcpiUtAcquireMutex (ACPI_MTX_INTERPRETER);
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if (ACPI_FAILURE (Status))
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{
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ACPI_ERROR ((AE_INFO, "Could not acquire AML Interpreter mutex"));
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExReacquireInterpreter
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*
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* PARAMETERS: None
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*
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* RETURN: None
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*
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* DESCRIPTION: Reacquire the interpreter execution region from within the
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* interpreter code. Failure to enter the interpreter region is a
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* fatal system error. Used in conjuction with
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* RelinquishInterpreter
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*
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******************************************************************************/
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void
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AcpiExReacquireInterpreter (
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void)
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{
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ACPI_FUNCTION_TRACE (ExReacquireInterpreter);
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/*
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* If the global serialized flag is set, do not release the interpreter,
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* since it was not actually released by AcpiExRelinquishInterpreter.
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* This forces the interpreter to be single threaded.
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*/
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if (!AcpiGbl_AllMethodsSerialized)
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{
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AcpiExEnterInterpreter ();
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExExitInterpreter
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*
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* PARAMETERS: None
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*
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* RETURN: None
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*
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* DESCRIPTION: Exit the interpreter execution region. This is the top level
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* routine used to exit the interpreter when all processing has
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* been completed.
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*
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******************************************************************************/
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void
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AcpiExExitInterpreter (
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void)
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{
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (ExExitInterpreter);
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Status = AcpiUtReleaseMutex (ACPI_MTX_INTERPRETER);
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if (ACPI_FAILURE (Status))
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{
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ACPI_ERROR ((AE_INFO, "Could not release AML Interpreter mutex"));
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExRelinquishInterpreter
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*
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* PARAMETERS: None
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*
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* RETURN: None
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*
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* DESCRIPTION: Exit the interpreter execution region, from within the
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* interpreter - before attempting an operation that will possibly
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* block the running thread.
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*
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* Cases where the interpreter is unlocked internally
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* 1) Method to be blocked on a Sleep() AML opcode
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* 2) Method to be blocked on an Acquire() AML opcode
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* 3) Method to be blocked on a Wait() AML opcode
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* 4) Method to be blocked to acquire the global lock
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* 5) Method to be blocked waiting to execute a serialized control method
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* that is currently executing
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* 6) About to invoke a user-installed opregion handler
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*
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******************************************************************************/
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void
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AcpiExRelinquishInterpreter (
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void)
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{
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ACPI_FUNCTION_TRACE (ExRelinquishInterpreter);
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/*
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* If the global serialized flag is set, do not release the interpreter.
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* This forces the interpreter to be single threaded.
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*/
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if (!AcpiGbl_AllMethodsSerialized)
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{
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AcpiExExitInterpreter ();
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExTruncateFor32bitTable
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*
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* PARAMETERS: ObjDesc - Object to be truncated
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*
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* RETURN: none
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*
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* DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is
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* 32-bit, as determined by the revision of the DSDT.
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*
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******************************************************************************/
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void
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AcpiExTruncateFor32bitTable (
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ACPI_OPERAND_OBJECT *ObjDesc)
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{
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ACPI_FUNCTION_ENTRY ();
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/*
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* Object must be a valid number and we must be executing
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* a control method. NS node could be there for AML_INT_NAMEPATH_OP.
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*/
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if ((!ObjDesc) ||
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(ACPI_GET_DESCRIPTOR_TYPE (ObjDesc) != ACPI_DESC_TYPE_OPERAND) ||
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(ObjDesc->Common.Type != ACPI_TYPE_INTEGER))
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{
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return;
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}
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if (AcpiGbl_IntegerByteWidth == 4)
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{
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/*
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* We are running a method that exists in a 32-bit ACPI table.
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* Truncate the value to 32 bits by zeroing out the upper 32-bit field
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*/
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ObjDesc->Integer.Value &= (UINT64) ACPI_UINT32_MAX;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExAcquireGlobalLock
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*
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* PARAMETERS: FieldFlags - Flags with Lock rule:
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* AlwaysLock or NeverLock
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*
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* RETURN: None
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*
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* DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field
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* flags specifiy that it is to be obtained before field access.
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*
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******************************************************************************/
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void
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AcpiExAcquireGlobalLock (
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UINT32 FieldFlags)
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{
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (ExAcquireGlobalLock);
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/* Only use the lock if the AlwaysLock bit is set */
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if (!(FieldFlags & AML_FIELD_LOCK_RULE_MASK))
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{
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return_VOID;
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}
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/* Attempt to get the global lock, wait forever */
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Status = AcpiExAcquireMutexObject (ACPI_WAIT_FOREVER,
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AcpiGbl_GlobalLockMutex, AcpiOsGetThreadId ());
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if (ACPI_FAILURE (Status))
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{
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ACPI_EXCEPTION ((AE_INFO, Status,
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"Could not acquire Global Lock"));
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExReleaseGlobalLock
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*
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* PARAMETERS: FieldFlags - Flags with Lock rule:
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* AlwaysLock or NeverLock
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*
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* RETURN: None
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*
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* DESCRIPTION: Release the ACPI hardware Global Lock
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*
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******************************************************************************/
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void
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AcpiExReleaseGlobalLock (
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UINT32 FieldFlags)
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{
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (ExReleaseGlobalLock);
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/* Only use the lock if the AlwaysLock bit is set */
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if (!(FieldFlags & AML_FIELD_LOCK_RULE_MASK))
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{
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return_VOID;
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}
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/* Release the global lock */
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Status = AcpiExReleaseMutexObject (AcpiGbl_GlobalLockMutex);
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if (ACPI_FAILURE (Status))
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{
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/* Report the error, but there isn't much else we can do */
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ACPI_EXCEPTION ((AE_INFO, Status,
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"Could not release Global Lock"));
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExDigitsNeeded
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*
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* PARAMETERS: Value - Value to be represented
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* Base - Base of representation
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*
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* RETURN: The number of digits.
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*
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* DESCRIPTION: Calculate the number of digits needed to represent the Value
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* in the given Base (Radix)
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*
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******************************************************************************/
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static UINT32
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AcpiExDigitsNeeded (
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UINT64 Value,
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UINT32 Base)
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{
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UINT32 NumDigits;
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UINT64 CurrentValue;
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ACPI_FUNCTION_TRACE (ExDigitsNeeded);
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/* UINT64 is unsigned, so we don't worry about a '-' prefix */
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if (Value == 0)
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{
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return_UINT32 (1);
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}
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CurrentValue = Value;
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NumDigits = 0;
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/* Count the digits in the requested base */
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while (CurrentValue)
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{
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(void) AcpiUtShortDivide (CurrentValue, Base, &CurrentValue, NULL);
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NumDigits++;
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}
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return_UINT32 (NumDigits);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExEisaIdToString
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*
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* PARAMETERS: CompressedId - EISAID to be converted
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* OutString - Where to put the converted string (8 bytes)
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*
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* RETURN: None
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*
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* DESCRIPTION: Convert a numeric EISAID to string representation. Return
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* buffer must be large enough to hold the string. The string
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* returned is always exactly of length ACPI_EISAID_STRING_SIZE
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* (includes null terminator). The EISAID is always 32 bits.
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*
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******************************************************************************/
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void
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AcpiExEisaIdToString (
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char *OutString,
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UINT64 CompressedId)
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{
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UINT32 SwappedId;
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ACPI_FUNCTION_ENTRY ();
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/* The EISAID should be a 32-bit integer */
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if (CompressedId > ACPI_UINT32_MAX)
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{
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ACPI_WARNING ((AE_INFO,
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"Expected EISAID is larger than 32 bits: 0x%8.8X%8.8X, truncating",
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ACPI_FORMAT_UINT64 (CompressedId)));
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}
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/* Swap ID to big-endian to get contiguous bits */
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SwappedId = AcpiUtDwordByteSwap ((UINT32) CompressedId);
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/* First 3 bytes are uppercase letters. Next 4 bytes are hexadecimal */
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OutString[0] = (char) (0x40 + (((unsigned long) SwappedId >> 26) & 0x1F));
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OutString[1] = (char) (0x40 + ((SwappedId >> 21) & 0x1F));
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OutString[2] = (char) (0x40 + ((SwappedId >> 16) & 0x1F));
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OutString[3] = AcpiUtHexToAsciiChar ((UINT64) SwappedId, 12);
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OutString[4] = AcpiUtHexToAsciiChar ((UINT64) SwappedId, 8);
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OutString[5] = AcpiUtHexToAsciiChar ((UINT64) SwappedId, 4);
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OutString[6] = AcpiUtHexToAsciiChar ((UINT64) SwappedId, 0);
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OutString[7] = 0;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExIntegerToString
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*
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* PARAMETERS: OutString - Where to put the converted string. At least
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* 21 bytes are needed to hold the largest
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* possible 64-bit integer.
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* Value - Value to be converted
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*
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* RETURN: None, string
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*
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* DESCRIPTION: Convert a 64-bit integer to decimal string representation.
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* Assumes string buffer is large enough to hold the string. The
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* largest string is (ACPI_MAX64_DECIMAL_DIGITS + 1).
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*
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******************************************************************************/
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void
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AcpiExIntegerToString (
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char *OutString,
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UINT64 Value)
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{
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UINT32 Count;
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UINT32 DigitsNeeded;
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UINT32 Remainder;
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ACPI_FUNCTION_ENTRY ();
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DigitsNeeded = AcpiExDigitsNeeded (Value, 10);
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OutString[DigitsNeeded] = 0;
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for (Count = DigitsNeeded; Count > 0; Count--)
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{
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(void) AcpiUtShortDivide (Value, 10, &Value, &Remainder);
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OutString[Count-1] = (char) ('0' + Remainder);\
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiIsValidSpaceId
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*
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* PARAMETERS: SpaceId - ID to be validated
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*
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* RETURN: TRUE if valid/supported ID.
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*
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* DESCRIPTION: Validate an operation region SpaceID.
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*
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******************************************************************************/
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BOOLEAN
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AcpiIsValidSpaceId (
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UINT8 SpaceId)
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{
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if ((SpaceId >= ACPI_NUM_PREDEFINED_REGIONS) &&
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(SpaceId < ACPI_USER_REGION_BEGIN) &&
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(SpaceId != ACPI_ADR_SPACE_DATA_TABLE) &&
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(SpaceId != ACPI_ADR_SPACE_FIXED_HARDWARE))
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{
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return (FALSE);
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}
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return (TRUE);
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}
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#endif
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