mirror of https://gitee.com/openkylin/linux.git
353 lines
11 KiB
C
353 lines
11 KiB
C
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/******************************************************************************
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*
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* Module Name: exutils - interpreter/scanner utilities
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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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/*
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* DEFINE_AML_GLOBALS is tested in amlcode.h
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* to determine whether certain global names should be "defined" or only
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* "declared" in the current compilation. This enhances maintainability
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* by enabling a single header file to embody all knowledge of the names
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* in question.
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*
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* Exactly one module of any executable should #define DEFINE_GLOBALS
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* before #including the header files which use this convention. The
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* names in question will be defined and initialized in that module,
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* and declared as extern in all other modules which #include those
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* header files.
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*/
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#define DEFINE_AML_GLOBALS
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#include <acpi/acpi.h>
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#include <acpi/acinterp.h>
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#include <acpi/amlcode.h>
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#include <acpi/acevents.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exutils")
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/* Local prototypes */
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static u32 acpi_ex_digits_needed(acpi_integer value, u32 base);
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#ifndef ACPI_NO_METHOD_EXECUTION
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_enter_interpreter
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Enter the interpreter execution region. Failure to enter
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* the interpreter region is a fatal system error
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*
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******************************************************************************/
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acpi_status acpi_ex_enter_interpreter(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE("ex_enter_interpreter");
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status = acpi_ut_acquire_mutex(ACPI_MTX_EXECUTE);
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if (ACPI_FAILURE(status)) {
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ACPI_REPORT_ERROR(("Could not acquire interpreter mutex\n"));
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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_exit_interpreter
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*
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* PARAMETERS: None
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*
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* RETURN: None
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*
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* DESCRIPTION: Exit the interpreter execution region
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*
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* Cases where the interpreter is unlocked:
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* 1) Completion of the execution of a control method
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* 2) Method blocked on a Sleep() AML opcode
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* 3) Method blocked on an Acquire() AML opcode
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* 4) Method blocked on a Wait() AML opcode
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* 5) Method blocked to acquire the global lock
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* 6) Method blocked to execute a serialized control method that is
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* already executing
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* 7) About to invoke a user-installed opregion handler
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*
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******************************************************************************/
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void acpi_ex_exit_interpreter(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE("ex_exit_interpreter");
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status = acpi_ut_release_mutex(ACPI_MTX_EXECUTE);
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if (ACPI_FAILURE(status)) {
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ACPI_REPORT_ERROR(("Could not release interpreter mutex\n"));
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_truncate_for32bit_table
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*
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* PARAMETERS: obj_desc - Object to be truncated
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*
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* RETURN: none
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*
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* DESCRIPTION: Truncate a number to 32-bits if the currently executing method
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* belongs to a 32-bit ACPI table.
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*
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******************************************************************************/
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void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc)
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{
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ACPI_FUNCTION_ENTRY();
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/*
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* Object must be a valid number and we must be executing
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* a control method
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*/
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if ((!obj_desc) ||
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(ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_INTEGER)) {
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return;
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}
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if (acpi_gbl_integer_byte_width == 4) {
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/*
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* We are running a method that exists in a 32-bit ACPI table.
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* Truncate the value to 32 bits by zeroing out the upper 32-bit field
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*/
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obj_desc->integer.value &= (acpi_integer) ACPI_UINT32_MAX;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_acquire_global_lock
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*
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* PARAMETERS: field_flags - Flags with Lock rule:
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* always_lock or never_lock
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*
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* RETURN: TRUE/FALSE indicating whether the lock was actually acquired
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*
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* DESCRIPTION: Obtain the global lock and keep track of this fact via two
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* methods. A global variable keeps the state of the lock, and
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* the state is returned to the caller.
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*
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******************************************************************************/
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u8 acpi_ex_acquire_global_lock(u32 field_flags)
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{
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u8 locked = FALSE;
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acpi_status status;
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ACPI_FUNCTION_TRACE("ex_acquire_global_lock");
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/* Only attempt lock if the always_lock bit is set */
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if (field_flags & AML_FIELD_LOCK_RULE_MASK) {
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/* We should attempt to get the lock, wait forever */
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status = acpi_ev_acquire_global_lock(ACPI_WAIT_FOREVER);
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if (ACPI_SUCCESS(status)) {
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locked = TRUE;
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} else {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Could not acquire Global Lock, %s\n",
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acpi_format_exception(status)));
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}
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}
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return_VALUE(locked);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_release_global_lock
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*
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* PARAMETERS: locked_by_me - Return value from corresponding call to
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* acquire_global_lock.
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*
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* RETURN: None
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*
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* DESCRIPTION: Release the global lock if it is locked.
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*
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******************************************************************************/
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void acpi_ex_release_global_lock(u8 locked_by_me)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE("ex_release_global_lock");
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/* Only attempt unlock if the caller locked it */
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if (locked_by_me) {
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/* OK, now release the lock */
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status = acpi_ev_release_global_lock();
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if (ACPI_FAILURE(status)) {
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/* Report the error, but there isn't much else we can do */
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ACPI_REPORT_ERROR(("Could not release ACPI Global Lock, %s\n", acpi_format_exception(status)));
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}
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_digits_needed
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*
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* PARAMETERS: Value - Value to be represented
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* Base - Base of representation
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*
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* RETURN: The number of digits.
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*
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* DESCRIPTION: Calculate the number of digits needed to represent the Value
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* in the given Base (Radix)
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*
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******************************************************************************/
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static u32 acpi_ex_digits_needed(acpi_integer value, u32 base)
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{
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u32 num_digits;
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acpi_integer current_value;
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ACPI_FUNCTION_TRACE("ex_digits_needed");
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/* acpi_integer is unsigned, so we don't worry about a '-' prefix */
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if (value == 0) {
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return_VALUE(1);
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}
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current_value = value;
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num_digits = 0;
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/* Count the digits in the requested base */
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while (current_value) {
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(void)acpi_ut_short_divide(current_value, base, ¤t_value,
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NULL);
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num_digits++;
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}
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return_VALUE(num_digits);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_eisa_id_to_string
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*
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* PARAMETERS: numeric_id - EISA ID to be converted
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* out_string - Where to put the converted string (8 bytes)
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*
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* RETURN: None
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*
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* DESCRIPTION: Convert a numeric EISA ID to string representation
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*
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******************************************************************************/
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void acpi_ex_eisa_id_to_string(u32 numeric_id, char *out_string)
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{
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u32 eisa_id;
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ACPI_FUNCTION_ENTRY();
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/* Swap ID to big-endian to get contiguous bits */
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eisa_id = acpi_ut_dword_byte_swap(numeric_id);
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out_string[0] = (char)('@' + (((unsigned long)eisa_id >> 26) & 0x1f));
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out_string[1] = (char)('@' + ((eisa_id >> 21) & 0x1f));
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out_string[2] = (char)('@' + ((eisa_id >> 16) & 0x1f));
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out_string[3] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 12);
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out_string[4] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 8);
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out_string[5] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 4);
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out_string[6] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 0);
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out_string[7] = 0;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_unsigned_integer_to_string
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*
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* PARAMETERS: Value - Value to be converted
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* out_string - Where to put the converted string (8 bytes)
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*
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* RETURN: None, string
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*
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* DESCRIPTION: Convert a number to string representation. Assumes string
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* buffer is large enough to hold the string.
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*
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******************************************************************************/
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void acpi_ex_unsigned_integer_to_string(acpi_integer value, char *out_string)
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{
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u32 count;
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u32 digits_needed;
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u32 remainder;
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ACPI_FUNCTION_ENTRY();
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digits_needed = acpi_ex_digits_needed(value, 10);
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out_string[digits_needed] = 0;
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for (count = digits_needed; count > 0; count--) {
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(void)acpi_ut_short_divide(value, 10, &value, &remainder);
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out_string[count - 1] = (char)('0' + remainder);
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}
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}
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#endif
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