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