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linux/drivers/acpi/acpica/exoparg6.c

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/******************************************************************************
*
* Module Name: exoparg6 - AML execution - opcodes with 6 arguments
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2011, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#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_LEQUAL_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_LLESS_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_LGREATER_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_LGREATER_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_LLESS_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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