340 lines
10 KiB
C
340 lines
10 KiB
C
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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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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acinterp.h>
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#include <acpi/acevents.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.
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*
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******************************************************************************/
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acpi_status acpi_ex_system_wait_semaphore(acpi_handle semaphore, u16 timeout)
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{
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acpi_status status;
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acpi_status status2;
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ACPI_FUNCTION_TRACE("ex_system_wait_semaphore");
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status = acpi_os_wait_semaphore(semaphore, 1, 0);
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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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status2 = acpi_ex_enter_interpreter();
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if (ACPI_FAILURE(status2)) {
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/* Report fatal error, could not acquire interpreter */
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return_ACPI_STATUS(status2);
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}
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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_REPORT_ERROR(("Stall: Time parameter is too large (%d)\n",
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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_suspend
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*
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* PARAMETERS: how_long - The amount of time to suspend,
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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: Suspend 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_suspend(acpi_integer how_long)
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{
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acpi_status status;
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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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acpi_os_sleep(how_long);
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/* And now we must get the interpreter again */
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status = acpi_ex_enter_interpreter();
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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_acquire_mutex
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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 function will cause a lock to be generated
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* for the Mutex pointed to by obj_desc.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_system_acquire_mutex(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_PTR("ex_system_acquire_mutex", obj_desc);
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if (!obj_desc) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Support for the _GL_ Mutex object -- go get the global lock */
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if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
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status =
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acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
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return_ACPI_STATUS(status);
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}
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status = acpi_ex_system_wait_semaphore(obj_desc->mutex.semaphore,
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(u16) time_desc->integer.value);
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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_release_mutex
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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. This operation is a request to release a
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* previously acquired Mutex. If the Mutex variable is set then
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* it will be decremented.
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*
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******************************************************************************/
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acpi_status acpi_ex_system_release_mutex(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_release_mutex");
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if (!obj_desc) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Support for the _GL_ Mutex object -- release the global lock */
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if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
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status = acpi_ev_release_global_lock();
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return_ACPI_STATUS(status);
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}
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status = acpi_os_signal_semaphore(obj_desc->mutex.semaphore, 1);
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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_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 = acpi_os_signal_semaphore(obj_desc->event.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.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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void *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.semaphore);
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obj_desc->event.semaphore = temp_semaphore;
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}
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return (status);
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}
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