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Diffstat (limited to 'drivers/acpi/acpica/exsystem.c')
| -rw-r--r-- | drivers/acpi/acpica/exsystem.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/exsystem.c b/drivers/acpi/acpica/exsystem.c new file mode 100644 index 0000000000..f665ffd9a3 --- /dev/null +++ b/drivers/acpi/acpica/exsystem.c @@ -0,0 +1,279 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: exsystem - Interface to OS services + * + * Copyright (C) 2000 - 2023, 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); +} |