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linux/drivers/acpi/executer/exsystem.c

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/******************************************************************************
*
* Module Name: exsystem - Interface to OS services
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* 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 <acpi/acinterp.h>
#include <acpi/acevents.h>
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exsystem")
/*******************************************************************************
*
* FUNCTION: acpi_ex_system_wait_semaphore
*
* PARAMETERS: Semaphore - OSD 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.
*
******************************************************************************/
acpi_status
acpi_ex_system_wait_semaphore (
acpi_handle semaphore,
u16 timeout)
{
acpi_status status;
acpi_status status2;
ACPI_FUNCTION_TRACE ("ex_system_wait_semaphore");
status = acpi_os_wait_semaphore (semaphore, 1, 0);
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 */
status2 = acpi_ex_enter_interpreter ();
if (ACPI_FAILURE (status2)) {
/* Report fatal error, could not acquire interpreter */
return_ACPI_STATUS (status2);
}
}
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_REPORT_ERROR (("Stall: Time parameter is too large (%d)\n", how_long));
status = AE_AML_OPERAND_VALUE;
}
else {
acpi_os_stall (how_long);
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_system_do_suspend
*
* PARAMETERS: how_long - The amount of time to suspend,
* in milliseconds
*
* RETURN: None
*
* DESCRIPTION: Suspend running thread for specified amount of time.
*
******************************************************************************/
acpi_status
acpi_ex_system_do_suspend (
acpi_integer how_long)
{
acpi_status status;
ACPI_FUNCTION_ENTRY ();
/* Since this thread will sleep, we must release the interpreter */
acpi_ex_exit_interpreter ();
acpi_os_sleep (how_long);
/* And now we must get the interpreter again */
status = acpi_ex_enter_interpreter ();
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_system_acquire_mutex
*
* 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 function will cause a lock to be generated
* for the Mutex pointed to by obj_desc.
*
******************************************************************************/
acpi_status
acpi_ex_system_acquire_mutex (
union acpi_operand_object *time_desc,
union acpi_operand_object *obj_desc)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE_PTR ("ex_system_acquire_mutex", obj_desc);
if (!obj_desc) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* Support for the _GL_ Mutex object -- go get the global lock
*/
if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
status = acpi_ev_acquire_global_lock ((u16) time_desc->integer.value);
return_ACPI_STATUS (status);
}
status = acpi_ex_system_wait_semaphore (obj_desc->mutex.semaphore,
(u16) time_desc->integer.value);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_system_release_mutex
*
* PARAMETERS: *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 release a
* previously acquired Mutex. If the Mutex variable is set then
* it will be decremented.
*
******************************************************************************/
acpi_status
acpi_ex_system_release_mutex (
union acpi_operand_object *obj_desc)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE ("ex_system_release_mutex");
if (!obj_desc) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* Support for the _GL_ Mutex object -- release the global lock
*/
if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
status = acpi_ev_release_global_lock ();
return_ACPI_STATUS (status);
}
status = acpi_os_signal_semaphore (obj_desc->mutex.semaphore, 1);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_system_signal_event
*
* PARAMETERS: *obj_desc - The object descriptor for this op
*
* RETURN: AE_OK
*
* 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.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.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;
void *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.semaphore);
obj_desc->event.semaphore = temp_semaphore;
}
return (status);
}
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