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/******************************************************************************
*
* Module Name: amsystem - Interface to OS services
* $Revision: 51 $
*
*****************************************************************************/
/*
* Copyright (C) 2000 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "achware.h"
#include "acevents.h"
#define _COMPONENT INTERPRETER
MODULE_NAME ("amsystem")
/*******************************************************************************
*
* FUNCTION: Acpi_aml_system_thread_id
*
* PARAMETERS: None
*
* RETURN: Current Thread ID (for this implementation a 1 is returned)
*
* DESCRIPTION: An invocation is identified by its Thread ID. In a single
* threaded OS the Thread ID is undefined so a 1 will be
* returned.
*
******************************************************************************/
u16
acpi_aml_system_thread_id (void)
{
return (1);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_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_aml_system_wait_semaphore (
ACPI_HANDLE semaphore,
u32 timeout)
{
ACPI_STATUS status;
status = acpi_os_wait_semaphore (semaphore, 1, 0);
if (ACPI_SUCCESS (status)) {
return (status);
}
if (status == AE_TIME) {
/* We must wait, so unlock the interpreter */
acpi_aml_exit_interpreter ();
status = acpi_os_wait_semaphore (semaphore, 1, timeout);
/* Reacquire the interpreter */
acpi_aml_enter_interpreter ();
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_system_do_stall
*
* PARAMETERS: How_long - The amount of time to stall
*
* RETURN: None
*
* DESCRIPTION: Suspend running thread for specified amount of time.
*
******************************************************************************/
void
acpi_aml_system_do_stall (
u32 how_long)
{
if (how_long > 1000) /* 1 millisecond */ {
/* Since this thread will sleep, we must release the interpreter */
acpi_aml_exit_interpreter ();
acpi_os_sleep_usec (how_long);
/* And now we must get the interpreter again */
acpi_aml_enter_interpreter ();
}
else {
acpi_os_sleep_usec (how_long);
}
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_system_do_suspend
*
* PARAMETERS: How_long - The amount of time to suspend
*
* RETURN: None
*
* DESCRIPTION: Suspend running thread for specified amount of time.
*
******************************************************************************/
void
acpi_aml_system_do_suspend (
u32 how_long)
{
/* Since this thread will sleep, we must release the interpreter */
acpi_aml_exit_interpreter ();
acpi_os_sleep ((u16) (how_long / (u32) 1000),
(u16) (how_long % (u32) 1000));
/* And now we must get the interpreter again */
acpi_aml_enter_interpreter ();
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_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_aml_system_acquire_mutex (
ACPI_OPERAND_OBJECT *time_desc,
ACPI_OPERAND_OBJECT *obj_desc)
{
ACPI_STATUS status = AE_OK;
if (!obj_desc) {
return (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 ();
return (status);
}
status = acpi_aml_system_wait_semaphore (obj_desc->mutex.semaphore,
time_desc->number.value);
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_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_aml_system_release_mutex (
ACPI_OPERAND_OBJECT *obj_desc)
{
ACPI_STATUS status = AE_OK;
if (!obj_desc) {
return (AE_BAD_PARAMETER);
}
/*
* Support for the _GL_ Mutex object -- release the global lock
*/
if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
acpi_ev_release_global_lock ();
return (AE_OK);
}
status = acpi_os_signal_semaphore (obj_desc->mutex.semaphore, 1);
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_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_aml_system_signal_event (
ACPI_OPERAND_OBJECT *obj_desc)
{
ACPI_STATUS status = AE_OK;
if (obj_desc) {
status = acpi_os_signal_semaphore (obj_desc->event.semaphore, 1);
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_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_aml_system_wait_event (
ACPI_OPERAND_OBJECT *time_desc,
ACPI_OPERAND_OBJECT *obj_desc)
{
ACPI_STATUS status = AE_OK;
if (obj_desc) {
status = acpi_aml_system_wait_semaphore (obj_desc->event.semaphore,
time_desc->number.value);
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_aml_system_reset_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_aml_system_reset_event (
ACPI_OPERAND_OBJECT *obj_desc)
{
ACPI_STATUS status = AE_OK;
void *temp_semaphore;
/*
* 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)) {
acpi_os_delete_semaphore (obj_desc->mutex.semaphore);
obj_desc->mutex.semaphore = temp_semaphore;
}
return (status);
}
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