exoparg6.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:7k
- /******************************************************************************
- *
- * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
- * $Revision: 4 $
- *
- *****************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "acinterp.h"
- #include "acparser.h"
- #include "amlcode.h"
- #define _COMPONENT ACPI_EXECUTER
- 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.
- !*/
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ex_do_match
- *
- * PARAMETERS: Match_op - The AML match operand
- * Package_value - Value from the target package
- * Match_value - Value to be matched
- *
- * RETURN: TRUE if the match is successful, FALSE otherwise
- *
- * DESCRIPTION: Implements the low-level match for the ASL Match operator
- *
- ******************************************************************************/
- u8
- acpi_ex_do_match (
- u32 match_op,
- acpi_integer package_value,
- acpi_integer match_value)
- {
- switch (match_op) {
- case MATCH_MTR: /* always true */
- break;
- case MATCH_MEQ: /* true if equal */
- if (package_value != match_value) {
- return (FALSE);
- }
- break;
- case MATCH_MLE: /* true if less than or equal */
- if (package_value > match_value) {
- return (FALSE);
- }
- break;
- case MATCH_MLT: /* true if less than */
- if (package_value >= match_value) {
- return (FALSE);
- }
- break;
- case MATCH_MGE: /* true if greater than or equal */
- if (package_value < match_value) {
- return (FALSE);
- }
- break;
- case MATCH_MGT: /* true if greater than */
- if (package_value <= match_value) {
- return (FALSE);
- }
- break;
- default: /* undefined */
- return (FALSE);
- }
- return TRUE;
- }
- /*******************************************************************************
- *
- * 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 (
- acpi_walk_state *walk_state)
- {
- acpi_operand_object **operand = &walk_state->operands[0];
- acpi_operand_object *return_desc = NULL;
- acpi_status status = AE_OK;
- u32 index;
- acpi_operand_object *this_element;
- 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_package[0], Match_op1[1], Match_object1[2],
- * Match_op2[3], Match_object2[4], Start_index[5])
- */
- /* Validate match comparison sub-opcodes */
- if ((operand[1]->integer.value > MAX_MATCH_OPERATOR) ||
- (operand[3]->integer.value > MAX_MATCH_OPERATOR)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "operation encoding out of rangen"));
- status = AE_AML_OPERAND_VALUE;
- goto cleanup;
- }
- index = (u32) operand[5]->integer.value;
- if (index >= (u32) operand[0]->package.count) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Index beyond package endn"));
- status = AE_AML_PACKAGE_LIMIT;
- goto cleanup;
- }
- return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
- if (!return_desc) {
- status = AE_NO_MEMORY;
- goto cleanup;
- }
- /* Default return value if no match found */
- return_desc->integer.value = ACPI_INTEGER_MAX;
- /*
- * Examine each element until a match is found. 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 -1
- * (its initial value) indicating that no match was found. When
- * returned as a Number, this will produce the Ones value as specified.
- */
- for ( ; index < operand[0]->package.count; index++) {
- this_element = operand[0]->package.elements[index];
- /*
- * Treat any NULL or non-numeric elements as non-matching.
- * TBD [Unhandled] - if an element is a Name,
- * should we examine its value?
- */
- if (!this_element ||
- this_element->common.type != ACPI_TYPE_INTEGER) {
- continue;
- }
- /*
- * Within these switch statements:
- * "break" (exit from the switch) signifies a match;
- * "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->integer.value, operand[2]->integer.value)) {
- continue;
- }
- if (!acpi_ex_do_match ((u32) operand[3]->integer.value,
- this_element->integer.value, operand[4]->integer.value)) {
- continue;
- }
- /* Match found: Index is the return value */
- return_desc->integer.value = index;
- break;
- }
- break;
- case AML_LOAD_TABLE_OP:
- status = AE_NOT_IMPLEMENTED;
- goto cleanup;
- break;
- default:
- REPORT_ERROR (("Acpi_ex_opcode_3A_0T_0R: Unknown opcode %Xn",
- walk_state->opcode));
- status = AE_AML_BAD_OPCODE;
- goto cleanup;
- break;
- }
- walk_state->result_obj = return_desc;
- cleanup:
- /* Delete return object on error */
- if (ACPI_FAILURE (status)) {
- acpi_ut_remove_reference (return_desc);
- }
- return_ACPI_STATUS (status);
- }