// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name : exoparg6 - AML execution - opcodes with 6 arguments
*
* Copyright ( C ) 2000 - 2025 , 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);
}
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