300 lines
8.0 KiB
C
300 lines
8.0 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: exoparg6 - AML execution - opcodes with 6 arguments
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*
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* Copyright (C) 2000 - 2019, 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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#include "acparser.h"
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#include "amlcode.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exoparg6")
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/*!
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* Naming convention for AML interpreter execution routines.
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*
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* The routines that begin execution of AML opcodes are named with a common
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* convention based upon the number of arguments, the number of target operands,
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* and whether or not a value is returned:
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*
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* AcpiExOpcode_xA_yT_zR
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*
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* Where:
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*
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* xA - ARGUMENTS: The number of arguments (input operands) that are
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* required for this opcode type (1 through 6 args).
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* yT - TARGETS: The number of targets (output operands) that are required
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* for this opcode type (0, 1, or 2 targets).
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* zR - RETURN VALUE: Indicates whether this opcode type returns a value
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* as the function return (0 or 1).
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*
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* The AcpiExOpcode* functions are called via the Dispatcher component with
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* fully resolved operands.
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!*/
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/* Local prototypes */
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static u8
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acpi_ex_do_match(u32 match_op,
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union acpi_operand_object *package_obj,
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union acpi_operand_object *match_obj);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_do_match
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*
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* PARAMETERS: match_op - The AML match operand
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* package_obj - Object from the target package
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* match_obj - Object to be matched
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*
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* RETURN: TRUE if the match is successful, FALSE otherwise
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*
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* DESCRIPTION: Implements the low-level match for the ASL Match operator.
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* Package elements will be implicitly converted to the type of
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* the match object (Integer/Buffer/String).
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*
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******************************************************************************/
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static u8
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acpi_ex_do_match(u32 match_op,
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union acpi_operand_object *package_obj,
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union acpi_operand_object *match_obj)
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{
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u8 logical_result = TRUE;
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acpi_status status;
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/*
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* Note: Since the package_obj/match_obj ordering is opposite to that of
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* the standard logical operators, we have to reverse them when we call
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* do_logical_op in order to make the implicit conversion rules work
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* correctly. However, this means we have to flip the entire equation
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* also. A bit ugly perhaps, but overall, better than fussing the
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* parameters around at runtime, over and over again.
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*
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* Below, P[i] refers to the package element, M refers to the Match object.
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*/
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switch (match_op) {
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case MATCH_MTR:
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/* Always true */
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break;
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case MATCH_MEQ:
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/*
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* True if equal: (P[i] == M)
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* Change to: (M == P[i])
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*/
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status =
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acpi_ex_do_logical_op(AML_LOGICAL_EQUAL_OP, match_obj,
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package_obj, &logical_result);
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if (ACPI_FAILURE(status)) {
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return (FALSE);
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}
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break;
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case MATCH_MLE:
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/*
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* True if less than or equal: (P[i] <= M) (P[i] not_greater than M)
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* Change to: (M >= P[i]) (M not_less than P[i])
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*/
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status =
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acpi_ex_do_logical_op(AML_LOGICAL_LESS_OP, match_obj,
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package_obj, &logical_result);
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if (ACPI_FAILURE(status)) {
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return (FALSE);
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}
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logical_result = (u8) ! logical_result;
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break;
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case MATCH_MLT:
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/*
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* True if less than: (P[i] < M)
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* Change to: (M > P[i])
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*/
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status =
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acpi_ex_do_logical_op(AML_LOGICAL_GREATER_OP, match_obj,
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package_obj, &logical_result);
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if (ACPI_FAILURE(status)) {
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return (FALSE);
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}
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break;
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case MATCH_MGE:
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/*
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* True if greater than or equal: (P[i] >= M) (P[i] not_less than M)
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* Change to: (M <= P[i]) (M not_greater than P[i])
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*/
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status =
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acpi_ex_do_logical_op(AML_LOGICAL_GREATER_OP, match_obj,
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package_obj, &logical_result);
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if (ACPI_FAILURE(status)) {
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return (FALSE);
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}
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logical_result = (u8) ! logical_result;
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break;
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case MATCH_MGT:
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/*
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* True if greater than: (P[i] > M)
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* Change to: (M < P[i])
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*/
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status =
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acpi_ex_do_logical_op(AML_LOGICAL_LESS_OP, match_obj,
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package_obj, &logical_result);
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if (ACPI_FAILURE(status)) {
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return (FALSE);
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}
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break;
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default:
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/* Undefined */
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return (FALSE);
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}
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return (logical_result);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_opcode_6A_0T_1R
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*
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* PARAMETERS: walk_state - Current walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
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*
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******************************************************************************/
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acpi_status acpi_ex_opcode_6A_0T_1R(struct acpi_walk_state *walk_state)
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{
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union acpi_operand_object **operand = &walk_state->operands[0];
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union acpi_operand_object *return_desc = NULL;
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acpi_status status = AE_OK;
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u64 index;
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union acpi_operand_object *this_element;
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ACPI_FUNCTION_TRACE_STR(ex_opcode_6A_0T_1R,
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acpi_ps_get_opcode_name(walk_state->opcode));
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switch (walk_state->opcode) {
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case AML_MATCH_OP:
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/*
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* Match (search_pkg[0], match_op1[1], match_obj1[2],
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* match_op2[3], match_obj2[4], start_index[5])
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*/
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/* Validate both Match Term Operators (MTR, MEQ, etc.) */
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if ((operand[1]->integer.value > MAX_MATCH_OPERATOR) ||
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(operand[3]->integer.value > MAX_MATCH_OPERATOR)) {
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ACPI_ERROR((AE_INFO, "Match operator out of range"));
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status = AE_AML_OPERAND_VALUE;
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goto cleanup;
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}
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/* Get the package start_index, validate against the package length */
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index = operand[5]->integer.value;
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if (index >= operand[0]->package.count) {
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ACPI_ERROR((AE_INFO,
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"Index (0x%8.8X%8.8X) beyond package end (0x%X)",
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ACPI_FORMAT_UINT64(index),
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operand[0]->package.count));
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status = AE_AML_PACKAGE_LIMIT;
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goto cleanup;
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}
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/* Create an integer for the return value */
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/* Default return value is ACPI_UINT64_MAX if no match found */
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return_desc = acpi_ut_create_integer_object(ACPI_UINT64_MAX);
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if (!return_desc) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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/*
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* Examine each element until a match is found. Both match conditions
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* must be satisfied for a match to occur. Within the loop,
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* "continue" signifies that the current element does not match
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* and the next should be examined.
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*
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* Upon finding a match, the loop will terminate via "break" at
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* the bottom. If it terminates "normally", match_value will be
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* ACPI_UINT64_MAX (Ones) (its initial value) indicating that no
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* match was found.
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*/
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for (; index < operand[0]->package.count; index++) {
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/* Get the current package element */
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this_element = operand[0]->package.elements[index];
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/* Treat any uninitialized (NULL) elements as non-matching */
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if (!this_element) {
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continue;
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}
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/*
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* Both match conditions must be satisfied. Execution of a continue
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* (proceed to next iteration of enclosing for loop) signifies a
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* non-match.
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*/
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if (!acpi_ex_do_match((u32) operand[1]->integer.value,
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this_element, operand[2])) {
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continue;
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}
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if (!acpi_ex_do_match((u32) operand[3]->integer.value,
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this_element, operand[4])) {
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continue;
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}
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/* Match found: Index is the return value */
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return_desc->integer.value = index;
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break;
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}
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break;
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case AML_LOAD_TABLE_OP:
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status = acpi_ex_load_table_op(walk_state, &return_desc);
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break;
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default:
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ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
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walk_state->opcode));
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status = AE_AML_BAD_OPCODE;
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goto cleanup;
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}
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cleanup:
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/* Delete return object on error */
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if (ACPI_FAILURE(status)) {
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acpi_ut_remove_reference(return_desc);
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}
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/* Save return object on success */
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else {
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walk_state->result_obj = return_desc;
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}
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return_ACPI_STATUS(status);
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}
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