411 lines
12 KiB
C
411 lines
12 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: exutils - interpreter/scanner utilities
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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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 "accommon.h"
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#include "acinterp.h"
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#include "amlcode.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(u64 value, u32 base);
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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: None
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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. Used in
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* conjunction with exit_interpreter.
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*
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******************************************************************************/
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void 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_INTERPRETER);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO,
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"Could not acquire AML Interpreter mutex"));
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}
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO, "Could not acquire AML Namespace mutex"));
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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_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. This is the top level
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* routine used to exit the interpreter when all processing has
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* been completed, or when the method blocks.
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*
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* Cases where the interpreter is unlocked internally:
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* 1) Method will be blocked on a Sleep() AML opcode
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* 2) Method will be blocked on an Acquire() AML opcode
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* 3) Method will be blocked on a Wait() AML opcode
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* 4) Method will be blocked to acquire the global lock
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* 5) Method will be blocked waiting to execute a serialized control
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* method that is currently executing
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* 6) 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_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO, "Could not release AML Namespace mutex"));
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}
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status = acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO,
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"Could not release AML Interpreter mutex"));
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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: TRUE if a truncation was performed, FALSE otherwise.
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*
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* DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is
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* 32-bit, as determined by the revision of the DSDT.
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*
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******************************************************************************/
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u8 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. Object could be NS node for AML_INT_NAMEPATH_OP.
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*/
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if ((!obj_desc) ||
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(ACPI_GET_DESCRIPTOR_TYPE(obj_desc) != ACPI_DESC_TYPE_OPERAND) ||
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(obj_desc->common.type != ACPI_TYPE_INTEGER)) {
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return (FALSE);
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}
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if ((acpi_gbl_integer_byte_width == 4) &&
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(obj_desc->integer.value > (u64)ACPI_UINT32_MAX)) {
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/*
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* We are executing in a 32-bit ACPI table. Truncate
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* 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 &= (u64)ACPI_UINT32_MAX;
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return (TRUE);
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}
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return (FALSE);
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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: None
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*
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* DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field
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* flags specify that it is to be obtained before field access.
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*
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******************************************************************************/
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void acpi_ex_acquire_global_lock(u32 field_flags)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ex_acquire_global_lock);
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/* Only use the lock if the always_lock bit is set */
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if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) {
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return_VOID;
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}
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/* Attempt to get the global lock, wait forever */
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status = acpi_ex_acquire_mutex_object(ACPI_WAIT_FOREVER,
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acpi_gbl_global_lock_mutex,
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acpi_os_get_thread_id());
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Could not acquire Global Lock"));
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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_release_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: None
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*
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* DESCRIPTION: Release the ACPI hardware Global Lock
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*
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******************************************************************************/
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void acpi_ex_release_global_lock(u32 field_flags)
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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 use the lock if the always_lock bit is set */
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if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) {
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return_VOID;
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}
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/* Release the global lock */
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status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
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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_EXCEPTION((AE_INFO, status,
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"Could not release Global Lock"));
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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(u64 value, u32 base)
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{
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u32 num_digits;
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u64 current_value;
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ACPI_FUNCTION_TRACE(ex_digits_needed);
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/* u64 is unsigned, so we don't worry about a '-' prefix */
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if (value == 0) {
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return_UINT32(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_UINT32(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: out_string - Where to put the converted string (8 bytes)
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* compressed_id - EISAID to be converted
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*
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* RETURN: None
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*
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* DESCRIPTION: Convert a numeric EISAID to string representation. Return
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* buffer must be large enough to hold the string. The string
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* returned is always exactly of length ACPI_EISAID_STRING_SIZE
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* (includes null terminator). The EISAID is always 32 bits.
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*
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******************************************************************************/
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void acpi_ex_eisa_id_to_string(char *out_string, u64 compressed_id)
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{
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u32 swapped_id;
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ACPI_FUNCTION_ENTRY();
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/* The EISAID should be a 32-bit integer */
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if (compressed_id > ACPI_UINT32_MAX) {
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ACPI_WARNING((AE_INFO,
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"Expected EISAID is larger than 32 bits: "
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"0x%8.8X%8.8X, truncating",
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ACPI_FORMAT_UINT64(compressed_id)));
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}
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/* Swap ID to big-endian to get contiguous bits */
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swapped_id = acpi_ut_dword_byte_swap((u32)compressed_id);
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/* First 3 bytes are uppercase letters. Next 4 bytes are hexadecimal */
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out_string[0] =
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(char)(0x40 + (((unsigned long)swapped_id >> 26) & 0x1F));
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out_string[1] = (char)(0x40 + ((swapped_id >> 21) & 0x1F));
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out_string[2] = (char)(0x40 + ((swapped_id >> 16) & 0x1F));
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out_string[3] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 12);
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out_string[4] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 8);
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out_string[5] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 4);
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out_string[6] = acpi_ut_hex_to_ascii_char((u64) swapped_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_integer_to_string
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*
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* PARAMETERS: out_string - Where to put the converted string. At least
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* 21 bytes are needed to hold the largest
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* possible 64-bit integer.
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* value - Value to be converted
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*
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* RETURN: Converted string in out_string
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*
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* DESCRIPTION: Convert a 64-bit integer to decimal string representation.
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* Assumes string buffer is large enough to hold the string. The
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* largest string is (ACPI_MAX64_DECIMAL_DIGITS + 1).
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*
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******************************************************************************/
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void acpi_ex_integer_to_string(char *out_string, u64 value)
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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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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_pci_cls_to_string
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*
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* PARAMETERS: out_string - Where to put the converted string (7 bytes)
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* class_code - PCI class code to be converted (3 bytes)
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*
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* RETURN: Converted string in out_string
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*
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* DESCRIPTION: Convert 3-bytes PCI class code to string representation.
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* Return buffer must be large enough to hold the string. The
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* string returned is always exactly of length
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* ACPI_PCICLS_STRING_SIZE (includes null terminator).
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*
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******************************************************************************/
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void acpi_ex_pci_cls_to_string(char *out_string, u8 class_code[3])
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{
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ACPI_FUNCTION_ENTRY();
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/* All 3 bytes are hexadecimal */
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out_string[0] = acpi_ut_hex_to_ascii_char((u64)class_code[0], 4);
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out_string[1] = acpi_ut_hex_to_ascii_char((u64)class_code[0], 0);
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out_string[2] = acpi_ut_hex_to_ascii_char((u64)class_code[1], 4);
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out_string[3] = acpi_ut_hex_to_ascii_char((u64)class_code[1], 0);
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out_string[4] = acpi_ut_hex_to_ascii_char((u64)class_code[2], 4);
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out_string[5] = acpi_ut_hex_to_ascii_char((u64)class_code[2], 0);
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out_string[6] = 0;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_is_valid_space_id
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*
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* PARAMETERS: space_id - ID to be validated
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*
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* RETURN: TRUE if space_id is a valid/supported ID.
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*
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* DESCRIPTION: Validate an operation region space_ID.
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*
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******************************************************************************/
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u8 acpi_is_valid_space_id(u8 space_id)
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{
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if ((space_id >= ACPI_NUM_PREDEFINED_REGIONS) &&
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(space_id < ACPI_USER_REGION_BEGIN) &&
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(space_id != ACPI_ADR_SPACE_DATA_TABLE) &&
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(space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
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return (FALSE);
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}
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return (TRUE);
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}
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