275 lines
7.3 KiB
C
275 lines
7.3 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: exsystem - Interface to OS services
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acinterp.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exsystem")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_system_wait_semaphore
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*
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* PARAMETERS: semaphore - Semaphore to wait on
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* timeout - Max time to wait
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*
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* RETURN: Status
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*
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* DESCRIPTION: Implements a semaphore wait with a check to see if the
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* semaphore is available immediately. If it is not, the
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* interpreter is released before waiting.
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*
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******************************************************************************/
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acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
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status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
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if (ACPI_SUCCESS(status)) {
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return_ACPI_STATUS(status);
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}
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if (status == AE_TIME) {
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/* We must wait, so unlock the interpreter */
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acpi_ex_exit_interpreter();
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status = acpi_os_wait_semaphore(semaphore, 1, timeout);
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"*** Thread awake after blocking, %s\n",
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acpi_format_exception(status)));
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/* Reacquire the interpreter */
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acpi_ex_enter_interpreter();
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_system_wait_mutex
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*
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* PARAMETERS: mutex - Mutex to wait on
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* timeout - Max time to wait
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*
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* RETURN: Status
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*
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* DESCRIPTION: Implements a mutex wait with a check to see if the
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* mutex is available immediately. If it is not, the
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* interpreter is released before waiting.
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*
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******************************************************************************/
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acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
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status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT);
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if (ACPI_SUCCESS(status)) {
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return_ACPI_STATUS(status);
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}
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if (status == AE_TIME) {
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/* We must wait, so unlock the interpreter */
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acpi_ex_exit_interpreter();
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status = acpi_os_acquire_mutex(mutex, timeout);
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"*** Thread awake after blocking, %s\n",
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acpi_format_exception(status)));
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/* Reacquire the interpreter */
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acpi_ex_enter_interpreter();
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_system_do_stall
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*
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* PARAMETERS: how_long - The amount of time to stall,
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* in microseconds
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*
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* RETURN: Status
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*
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* DESCRIPTION: Suspend running thread for specified amount of time.
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* Note: ACPI specification requires that Stall() does not
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* relinquish the processor, and delays longer than 100 usec
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* should use Sleep() instead. We allow stalls up to 255 usec
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* for compatibility with other interpreters and existing BIOSs.
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*
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******************************************************************************/
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acpi_status acpi_ex_system_do_stall(u32 how_long)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_ENTRY();
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if (how_long > 255) { /* 255 microseconds */
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/*
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* Longer than 255 usec, this is an error
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*
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* (ACPI specifies 100 usec as max, but this gives some slack in
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* order to support existing BIOSs)
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*/
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ACPI_ERROR((AE_INFO,
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"Time parameter is too large (%u)", how_long));
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status = AE_AML_OPERAND_VALUE;
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} else {
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acpi_os_stall(how_long);
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}
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_system_do_sleep
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*
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* PARAMETERS: how_long - The amount of time to sleep,
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* in milliseconds
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*
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* RETURN: None
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*
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* DESCRIPTION: Sleep the running thread for specified amount of time.
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*
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******************************************************************************/
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acpi_status acpi_ex_system_do_sleep(u64 how_long)
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{
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ACPI_FUNCTION_ENTRY();
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/* Since this thread will sleep, we must release the interpreter */
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acpi_ex_exit_interpreter();
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/*
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* For compatibility with other ACPI implementations and to prevent
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* accidental deep sleeps, limit the sleep time to something reasonable.
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*/
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if (how_long > ACPI_MAX_SLEEP) {
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how_long = ACPI_MAX_SLEEP;
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}
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acpi_os_sleep(how_long);
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/* And now we must get the interpreter again */
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acpi_ex_enter_interpreter();
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_system_signal_event
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*
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* PARAMETERS: obj_desc - The object descriptor for this op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Provides an access point to perform synchronization operations
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* within the AML.
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*
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******************************************************************************/
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acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(ex_system_signal_event);
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if (obj_desc) {
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status =
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acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_system_wait_event
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*
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* PARAMETERS: time_desc - The 'time to delay' object descriptor
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* obj_desc - The object descriptor for this op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Provides an access point to perform synchronization operations
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* within the AML. This operation is a request to wait for an
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* event.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
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union acpi_operand_object *obj_desc)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(ex_system_wait_event);
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if (obj_desc) {
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status =
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acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
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(u16) time_desc->integer.
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value);
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_system_reset_event
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*
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* PARAMETERS: obj_desc - The object descriptor for this op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Reset an event to a known state.
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*
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******************************************************************************/
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acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
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{
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acpi_status status = AE_OK;
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acpi_semaphore temp_semaphore;
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ACPI_FUNCTION_ENTRY();
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/*
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* We are going to simply delete the existing semaphore and
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* create a new one!
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*/
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status =
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acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
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if (ACPI_SUCCESS(status)) {
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(void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
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obj_desc->event.os_semaphore = temp_semaphore;
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}
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return (status);
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}
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