cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/exoparg6.c

/******************************************************************************
 *
 * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, 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); }

Contributors

PersonTokensPropCommitsCommitProp
Len Brown13156.47%125.00%
Linus Torvalds9842.24%125.00%
Robert Moore31.29%250.00%
Total232100.00%4100.00%

/******************************************************************************* * * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds31283.42%17.69%
Robert Moore4211.23%861.54%
Andy Grover123.21%215.38%
Len Brown82.14%215.38%
Total374100.00%13100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds42665.24%15.00%
Len Brown14422.05%315.00%
Robert Moore6710.26%1155.00%
Andy Grover152.30%420.00%
Patrick Mochel10.15%15.00%
Total653100.00%20100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.