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428 lines
14 KiB
C
428 lines
14 KiB
C
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/******************************************************************************
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*
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* Module Name: exsystem - Interface to OS services
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*
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*****************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#define __EXSYSTEM_C__
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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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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exsystem")
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/*******************************************************************************
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*
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* FUNCTION: AcpiExSystemWaitSemaphore
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*
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* PARAMETERS: Semaphore - Semaphore to wait on
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* Timeout - Max time to wait
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*
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* RETURN: Status
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*
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* DESCRIPTION: Implements a semaphore wait with a check to see if the
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* semaphore is available immediately. If it is not, the
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* interpreter is released before waiting.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExSystemWaitSemaphore (
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ACPI_SEMAPHORE Semaphore,
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UINT16 Timeout)
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{
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (ExSystemWaitSemaphore);
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Status = AcpiOsWaitSemaphore (Semaphore, 1, ACPI_DO_NOT_WAIT);
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if (ACPI_SUCCESS (Status))
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{
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return_ACPI_STATUS (Status);
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}
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if (Status == AE_TIME)
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{
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/* We must wait, so unlock the interpreter */
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AcpiExRelinquishInterpreter ();
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Status = AcpiOsWaitSemaphore (Semaphore, 1, Timeout);
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
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"*** Thread awake after blocking, %s\n",
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AcpiFormatException (Status)));
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/* Reacquire the interpreter */
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AcpiExReacquireInterpreter ();
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}
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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: AcpiExSystemWaitMutex
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*
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* PARAMETERS: Mutex - Mutex to wait on
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* Timeout - Max time to wait
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*
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* RETURN: Status
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*
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* DESCRIPTION: Implements a mutex wait with a check to see if the
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* mutex is available immediately. If it is not, the
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* interpreter is released before waiting.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExSystemWaitMutex (
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ACPI_MUTEX Mutex,
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UINT16 Timeout)
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{
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (ExSystemWaitMutex);
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Status = AcpiOsAcquireMutex (Mutex, ACPI_DO_NOT_WAIT);
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if (ACPI_SUCCESS (Status))
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{
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return_ACPI_STATUS (Status);
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}
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if (Status == AE_TIME)
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{
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/* We must wait, so unlock the interpreter */
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AcpiExRelinquishInterpreter ();
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Status = AcpiOsAcquireMutex (Mutex, Timeout);
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
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"*** Thread awake after blocking, %s\n",
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AcpiFormatException (Status)));
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/* Reacquire the interpreter */
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AcpiExReacquireInterpreter ();
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}
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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: AcpiExSystemDoStall
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*
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* PARAMETERS: HowLong - The amount of time to stall,
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* in microseconds
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*
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* RETURN: Status
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*
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* DESCRIPTION: Suspend running thread for specified amount of time.
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* Note: ACPI specification requires that Stall() does not
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* relinquish the processor, and delays longer than 100 usec
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* should use Sleep() instead. We allow stalls up to 255 usec
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* for compatibility with other interpreters and existing BIOSs.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExSystemDoStall (
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UINT32 HowLong)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_FUNCTION_ENTRY ();
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if (HowLong > 255) /* 255 microseconds */
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{
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/*
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* Longer than 255 usec, this is an error
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*
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* (ACPI specifies 100 usec as max, but this gives some slack in
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* order to support existing BIOSs)
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*/
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ACPI_ERROR ((AE_INFO, "Time parameter is too large (%u)",
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HowLong));
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Status = AE_AML_OPERAND_VALUE;
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}
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else
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{
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AcpiOsStall (HowLong);
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}
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return (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExSystemDoSleep
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*
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* PARAMETERS: HowLong - The amount of time to sleep,
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* in milliseconds
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*
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* RETURN: None
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*
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* DESCRIPTION: Sleep the running thread for specified amount of time.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExSystemDoSleep (
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UINT64 HowLong)
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{
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ACPI_FUNCTION_ENTRY ();
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/* Since this thread will sleep, we must release the interpreter */
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AcpiExRelinquishInterpreter ();
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/*
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* For compatibility with other ACPI implementations and to prevent
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* accidental deep sleeps, limit the sleep time to something reasonable.
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*/
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if (HowLong > ACPI_MAX_SLEEP)
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{
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HowLong = ACPI_MAX_SLEEP;
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}
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AcpiOsSleep (HowLong);
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/* And now we must get the interpreter again */
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AcpiExReacquireInterpreter ();
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExSystemSignalEvent
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*
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* PARAMETERS: ObjDesc - The object descriptor for this op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Provides an access point to perform synchronization operations
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* within the AML.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExSystemSignalEvent (
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ACPI_OPERAND_OBJECT *ObjDesc)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_FUNCTION_TRACE (ExSystemSignalEvent);
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if (ObjDesc)
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{
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Status = AcpiOsSignalSemaphore (ObjDesc->Event.OsSemaphore, 1);
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}
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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: AcpiExSystemWaitEvent
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*
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* PARAMETERS: TimeDesc - The 'time to delay' object descriptor
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* ObjDesc - The object descriptor for this op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Provides an access point to perform synchronization operations
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* within the AML. This operation is a request to wait for an
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* event.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExSystemWaitEvent (
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ACPI_OPERAND_OBJECT *TimeDesc,
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ACPI_OPERAND_OBJECT *ObjDesc)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_FUNCTION_TRACE (ExSystemWaitEvent);
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if (ObjDesc)
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{
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Status = AcpiExSystemWaitSemaphore (ObjDesc->Event.OsSemaphore,
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(UINT16) TimeDesc->Integer.Value);
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}
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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: AcpiExSystemResetEvent
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*
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* PARAMETERS: ObjDesc - The object descriptor for this op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Reset an event to a known state.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExSystemResetEvent (
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ACPI_OPERAND_OBJECT *ObjDesc)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_SEMAPHORE TempSemaphore;
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ACPI_FUNCTION_ENTRY ();
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/*
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* We are going to simply delete the existing semaphore and
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* create a new one!
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*/
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Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore);
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if (ACPI_SUCCESS (Status))
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{
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(void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore);
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ObjDesc->Event.OsSemaphore = TempSemaphore;
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}
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return (Status);
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}
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