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/******************************************************************************
*
* 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 range\n"));
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 end\n"));
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 %X\n",
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);
}
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