280 lines
7.5 KiB
C
280 lines
7.5 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
|
|
/******************************************************************************
|
|
*
|
|
* Module Name: exsystem - Interface to OS services
|
|
*
|
|
* Copyright (C) 2000 - 2022, Intel Corp.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#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_us - 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_us)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
|
|
ACPI_FUNCTION_ENTRY();
|
|
|
|
if (how_long_us > 255) {
|
|
/*
|
|
* Longer than 255 microseconds, 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_us));
|
|
status = AE_AML_OPERAND_VALUE;
|
|
} else {
|
|
if (how_long_us > 100) {
|
|
ACPI_WARNING((AE_INFO,
|
|
"Time parameter %u us > 100 us violating ACPI spec, please fix the firmware.",
|
|
how_long_us));
|
|
}
|
|
acpi_os_stall(how_long_us);
|
|
}
|
|
|
|
return (status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_system_do_sleep
|
|
*
|
|
* PARAMETERS: how_long_ms - 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_ms)
|
|
{
|
|
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_ms > ACPI_MAX_SLEEP) {
|
|
how_long_ms = ACPI_MAX_SLEEP;
|
|
}
|
|
|
|
acpi_os_sleep(how_long_ms);
|
|
|
|
/* 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);
|
|
}
|