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Diffstat (limited to '')
| -rw-r--r-- | drivers/acpi/acpica/exoparg6.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/exoparg6.c b/drivers/acpi/acpica/exoparg6.c new file mode 100644 index 000000000..3941525f3 --- /dev/null +++ b/drivers/acpi/acpica/exoparg6.c @@ -0,0 +1,299 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: exoparg6 - AML execution - opcodes with 6 arguments + * + * Copyright (C) 2000 - 2018, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "acinterp.h" +#include "acparser.h" +#include "amlcode.h" + +#define _COMPONENT ACPI_EXECUTER +ACPI_MODULE_NAME("exoparg6") + +/*! + * Naming convention for AML interpreter execution routines. + * + * The routines that begin execution of AML opcodes are named with a common + * convention based upon the number of arguments, the number of target operands, + * and whether or not a value is returned: + * + * AcpiExOpcode_xA_yT_zR + * + * Where: + * + * xA - ARGUMENTS: The number of arguments (input operands) that are + * required for this opcode type (1 through 6 args). + * yT - TARGETS: The number of targets (output operands) that are required + * for this opcode type (0, 1, or 2 targets). + * zR - RETURN VALUE: Indicates whether this opcode type returns a value + * as the function return (0 or 1). + * + * The AcpiExOpcode* functions are called via the Dispatcher component with + * fully resolved operands. +!*/ +/* Local prototypes */ +static u8 +acpi_ex_do_match(u32 match_op, + union acpi_operand_object *package_obj, + union acpi_operand_object *match_obj); + +/******************************************************************************* + * + * FUNCTION: acpi_ex_do_match + * + * PARAMETERS: match_op - The AML match operand + * package_obj - Object from the target package + * match_obj - Object to be matched + * + * RETURN: TRUE if the match is successful, FALSE otherwise + * + * DESCRIPTION: Implements the low-level match for the ASL Match operator. + * Package elements will be implicitly converted to the type of + * the match object (Integer/Buffer/String). + * + ******************************************************************************/ + +static u8 +acpi_ex_do_match(u32 match_op, + union acpi_operand_object *package_obj, + union acpi_operand_object *match_obj) +{ + u8 logical_result = TRUE; + acpi_status status; + + /* + * Note: Since the package_obj/match_obj ordering is opposite to that of + * the standard logical operators, we have to reverse them when we call + * do_logical_op in order to make the implicit conversion rules work + * correctly. However, this means we have to flip the entire equation + * also. A bit ugly perhaps, but overall, better than fussing the + * parameters around at runtime, over and over again. + * + * Below, P[i] refers to the package element, M refers to the Match object. + */ + switch (match_op) { + case MATCH_MTR: + + /* Always true */ + + break; + + case MATCH_MEQ: + /* + * True if equal: (P[i] == M) + * Change to: (M == P[i]) + */ + status = + acpi_ex_do_logical_op(AML_LOGICAL_EQUAL_OP, match_obj, + package_obj, &logical_result); + if (ACPI_FAILURE(status)) { + return (FALSE); + } + break; + + case MATCH_MLE: + /* + * True if less than or equal: (P[i] <= M) (P[i] not_greater than M) + * Change to: (M >= P[i]) (M not_less than P[i]) + */ + status = + acpi_ex_do_logical_op(AML_LOGICAL_LESS_OP, match_obj, + package_obj, &logical_result); + if (ACPI_FAILURE(status)) { + return (FALSE); + } + logical_result = (u8) ! logical_result; + break; + + case MATCH_MLT: + /* + * True if less than: (P[i] < M) + * Change to: (M > P[i]) + */ + status = + acpi_ex_do_logical_op(AML_LOGICAL_GREATER_OP, match_obj, + package_obj, &logical_result); + if (ACPI_FAILURE(status)) { + return (FALSE); + } + break; + + case MATCH_MGE: + /* + * True if greater than or equal: (P[i] >= M) (P[i] not_less than M) + * Change to: (M <= P[i]) (M not_greater than P[i]) + */ + status = + acpi_ex_do_logical_op(AML_LOGICAL_GREATER_OP, match_obj, + package_obj, &logical_result); + if (ACPI_FAILURE(status)) { + return (FALSE); + } + logical_result = (u8) ! logical_result; + break; + + case MATCH_MGT: + /* + * True if greater than: (P[i] > M) + * Change to: (M < P[i]) + */ + status = + acpi_ex_do_logical_op(AML_LOGICAL_LESS_OP, match_obj, + package_obj, &logical_result); + if (ACPI_FAILURE(status)) { + return (FALSE); + } + break; + + default: + + /* Undefined */ + + return (FALSE); + } + + return (logical_result); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_opcode_6A_0T_1R + * + * PARAMETERS: walk_state - Current walk state + * + * RETURN: Status + * + * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value + * + ******************************************************************************/ + +acpi_status acpi_ex_opcode_6A_0T_1R(struct acpi_walk_state *walk_state) +{ + union acpi_operand_object **operand = &walk_state->operands[0]; + union acpi_operand_object *return_desc = NULL; + acpi_status status = AE_OK; + u64 index; + union acpi_operand_object *this_element; + + ACPI_FUNCTION_TRACE_STR(ex_opcode_6A_0T_1R, + acpi_ps_get_opcode_name(walk_state->opcode)); + + switch (walk_state->opcode) { + case AML_MATCH_OP: + /* + * Match (search_pkg[0], match_op1[1], match_obj1[2], + * match_op2[3], match_obj2[4], start_index[5]) + */ + + /* Validate both Match Term Operators (MTR, MEQ, etc.) */ + + if ((operand[1]->integer.value > MAX_MATCH_OPERATOR) || + (operand[3]->integer.value > MAX_MATCH_OPERATOR)) { + ACPI_ERROR((AE_INFO, "Match operator out of range")); + status = AE_AML_OPERAND_VALUE; + goto cleanup; + } + + /* Get the package start_index, validate against the package length */ + + index = operand[5]->integer.value; + if (index >= operand[0]->package.count) { + ACPI_ERROR((AE_INFO, + "Index (0x%8.8X%8.8X) beyond package end (0x%X)", + ACPI_FORMAT_UINT64(index), + operand[0]->package.count)); + status = AE_AML_PACKAGE_LIMIT; + goto cleanup; + } + + /* Create an integer for the return value */ + /* Default return value is ACPI_UINT64_MAX if no match found */ + + return_desc = acpi_ut_create_integer_object(ACPI_UINT64_MAX); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + + } + + /* + * Examine each element until a match is found. Both match conditions + * must be satisfied for a match to occur. Within the loop, + * "continue" signifies that the current element does not match + * and the next should be examined. + * + * Upon finding a match, the loop will terminate via "break" at + * the bottom. If it terminates "normally", match_value will be + * ACPI_UINT64_MAX (Ones) (its initial value) indicating that no + * match was found. + */ + for (; index < operand[0]->package.count; index++) { + + /* Get the current package element */ + + this_element = operand[0]->package.elements[index]; + + /* Treat any uninitialized (NULL) elements as non-matching */ + + if (!this_element) { + continue; + } + + /* + * Both match conditions must be satisfied. Execution of a continue + * (proceed to next iteration of enclosing for loop) signifies a + * non-match. + */ + if (!acpi_ex_do_match((u32) operand[1]->integer.value, + this_element, operand[2])) { + continue; + } + + if (!acpi_ex_do_match((u32) operand[3]->integer.value, + this_element, operand[4])) { + continue; + } + + /* Match found: Index is the return value */ + + return_desc->integer.value = index; + break; + } + break; + + case AML_LOAD_TABLE_OP: + + status = acpi_ex_load_table_op(walk_state, &return_desc); + break; + + default: + + ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", + walk_state->opcode)); + + status = AE_AML_BAD_OPCODE; + goto cleanup; + } + +cleanup: + + /* Delete return object on error */ + + if (ACPI_FAILURE(status)) { + acpi_ut_remove_reference(return_desc); + } + + /* Save return object on success */ + + else { + walk_state->result_obj = return_desc; + } + + return_ACPI_STATUS(status); +} |