/******************************************************************************
*
* Module Name: exsystem - Interface to OS services
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2012, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#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);
}
