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274 lines
7.3 KiB
274 lines
7.3 KiB
// 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 - 2021, 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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