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/****************************************************************************** |
* |
* Module Name: exsystem - Interface to OS services |
* |
*****************************************************************************/ |
|
/* |
* Copyright (C) 2000 - 2015, 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. |
*/ |
|
#include <acpi/acpi.h> |
#include "accommon.h" |
#include "acinterp.h" |
|
#define _COMPONENT ACPI_EXECUTER |
ACPI_MODULE_NAME("exsystem") |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ex_system_wait_semaphore |
* |
* 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 acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout) |
{ |
acpi_status status; |
|
ACPI_FUNCTION_TRACE(ex_system_wait_semaphore); |
|
status = acpi_os_wait_semaphore(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 */ |
|
acpi_ex_exit_interpreter(); |
|
status = acpi_os_wait_semaphore(semaphore, 1, timeout); |
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
"*** Thread awake after blocking, %s\n", |
acpi_format_exception(status))); |
|
/* Reacquire the interpreter */ |
|
acpi_ex_enter_interpreter(); |
} |
|
return_ACPI_STATUS(status); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ex_system_wait_mutex |
* |
* 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 acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout) |
{ |
acpi_status status; |
|
ACPI_FUNCTION_TRACE(ex_system_wait_mutex); |
|
status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT); |
if (ACPI_SUCCESS(status)) { |
return_ACPI_STATUS(status); |
} |
|
if (status == AE_TIME) { |
|
/* We must wait, so unlock the interpreter */ |
|
acpi_ex_exit_interpreter(); |
|
status = acpi_os_acquire_mutex(mutex, timeout); |
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
"*** Thread awake after blocking, %s\n", |
acpi_format_exception(status))); |
|
/* Reacquire the interpreter */ |
|
acpi_ex_enter_interpreter(); |
} |
|
return_ACPI_STATUS(status); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ex_system_do_stall |
* |
* PARAMETERS: how_long - 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 acpi_ex_system_do_stall(u32 how_long) |
{ |
acpi_status status = AE_OK; |
|
ACPI_FUNCTION_ENTRY(); |
|
if (how_long > 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)", |
how_long)); |
status = AE_AML_OPERAND_VALUE; |
} else { |
acpi_os_stall(how_long); |
} |
|
return (status); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ex_system_do_sleep |
* |
* PARAMETERS: how_long - The amount of time to sleep, |
* in milliseconds |
* |
* RETURN: None |
* |
* DESCRIPTION: Sleep the running thread for specified amount of time. |
* |
******************************************************************************/ |
|
acpi_status acpi_ex_system_do_sleep(u64 how_long) |
{ |
ACPI_FUNCTION_ENTRY(); |
|
/* Since this thread will sleep, we must release the interpreter */ |
|
acpi_ex_exit_interpreter(); |
|
/* |
* For compatibility with other ACPI implementations and to prevent |
* accidental deep sleeps, limit the sleep time to something reasonable. |
*/ |
if (how_long > ACPI_MAX_SLEEP) { |
how_long = ACPI_MAX_SLEEP; |
} |
|
acpi_os_sleep(how_long); |
|
/* And now we must get the interpreter again */ |
|
acpi_ex_enter_interpreter(); |
return (AE_OK); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ex_system_signal_event |
* |
* PARAMETERS: obj_desc - The object descriptor for this op |
* |
* RETURN: Status |
* |
* DESCRIPTION: Provides an access point to perform synchronization operations |
* within the AML. |
* |
******************************************************************************/ |
|
acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc) |
{ |
acpi_status status = AE_OK; |
|
ACPI_FUNCTION_TRACE(ex_system_signal_event); |
|
if (obj_desc) { |
status = |
acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1); |
} |
|
return_ACPI_STATUS(status); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ex_system_wait_event |
* |
* PARAMETERS: time_desc - The 'time to delay' object descriptor |
* obj_desc - 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 |
acpi_ex_system_wait_event(union acpi_operand_object *time_desc, |
union acpi_operand_object *obj_desc) |
{ |
acpi_status status = AE_OK; |
|
ACPI_FUNCTION_TRACE(ex_system_wait_event); |
|
if (obj_desc) { |
status = |
acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore, |
(u16) time_desc->integer. |
value); |
} |
|
return_ACPI_STATUS(status); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ex_system_reset_event |
* |
* PARAMETERS: obj_desc - The object descriptor for this op |
* |
* RETURN: Status |
* |
* DESCRIPTION: Reset an event to a known state. |
* |
******************************************************************************/ |
|
acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc) |
{ |
acpi_status status = AE_OK; |
acpi_semaphore temp_semaphore; |
|
ACPI_FUNCTION_ENTRY(); |
|
/* |
* We are going to simply delete the existing semaphore and |
* create a new one! |
*/ |
status = |
acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore); |
if (ACPI_SUCCESS(status)) { |
(void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore); |
obj_desc->event.os_semaphore = temp_semaphore; |
} |
|
return (status); |
} |