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299 lines
8.0 KiB
299 lines
8.0 KiB
// 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 - 2021, 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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