cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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exoparg6.c (8158B)


      1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
      2/******************************************************************************
      3 *
      4 * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
      5 *
      6 * Copyright (C) 2000 - 2022, Intel Corp.
      7 *
      8 *****************************************************************************/
      9
     10#include <acpi/acpi.h>
     11#include "accommon.h"
     12#include "acinterp.h"
     13#include "acparser.h"
     14#include "amlcode.h"
     15
     16#define _COMPONENT          ACPI_EXECUTER
     17ACPI_MODULE_NAME("exoparg6")
     18
     19/*!
     20 * Naming convention for AML interpreter execution routines.
     21 *
     22 * The routines that begin execution of AML opcodes are named with a common
     23 * convention based upon the number of arguments, the number of target operands,
     24 * and whether or not a value is returned:
     25 *
     26 *      AcpiExOpcode_xA_yT_zR
     27 *
     28 * Where:
     29 *
     30 * xA - ARGUMENTS:    The number of arguments (input operands) that are
     31 *                    required for this opcode type (1 through 6 args).
     32 * yT - TARGETS:      The number of targets (output operands) that are required
     33 *                    for this opcode type (0, 1, or 2 targets).
     34 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
     35 *                    as the function return (0 or 1).
     36 *
     37 * The AcpiExOpcode* functions are called via the Dispatcher component with
     38 * fully resolved operands.
     39!*/
     40/* Local prototypes */
     41static u8
     42acpi_ex_do_match(u32 match_op,
     43		 union acpi_operand_object *package_obj,
     44		 union acpi_operand_object *match_obj);
     45
     46/*******************************************************************************
     47 *
     48 * FUNCTION:    acpi_ex_do_match
     49 *
     50 * PARAMETERS:  match_op        - The AML match operand
     51 *              package_obj     - Object from the target package
     52 *              match_obj       - Object to be matched
     53 *
     54 * RETURN:      TRUE if the match is successful, FALSE otherwise
     55 *
     56 * DESCRIPTION: Implements the low-level match for the ASL Match operator.
     57 *              Package elements will be implicitly converted to the type of
     58 *              the match object (Integer/Buffer/String).
     59 *
     60 ******************************************************************************/
     61
     62static u8
     63acpi_ex_do_match(u32 match_op,
     64		 union acpi_operand_object *package_obj,
     65		 union acpi_operand_object *match_obj)
     66{
     67	u8 logical_result = TRUE;
     68	acpi_status status;
     69
     70	/*
     71	 * Note: Since the package_obj/match_obj ordering is opposite to that of
     72	 * the standard logical operators, we have to reverse them when we call
     73	 * do_logical_op in order to make the implicit conversion rules work
     74	 * correctly. However, this means we have to flip the entire equation
     75	 * also. A bit ugly perhaps, but overall, better than fussing the
     76	 * parameters around at runtime, over and over again.
     77	 *
     78	 * Below, P[i] refers to the package element, M refers to the Match object.
     79	 */
     80	switch (match_op) {
     81	case MATCH_MTR:
     82
     83		/* Always true */
     84
     85		break;
     86
     87	case MATCH_MEQ:
     88		/*
     89		 * True if equal: (P[i] == M)
     90		 * Change to:     (M == P[i])
     91		 */
     92		status =
     93		    acpi_ex_do_logical_op(AML_LOGICAL_EQUAL_OP, match_obj,
     94					  package_obj, &logical_result);
     95		if (ACPI_FAILURE(status)) {
     96			return (FALSE);
     97		}
     98		break;
     99
    100	case MATCH_MLE:
    101		/*
    102		 * True if less than or equal: (P[i] <= M) (P[i] not_greater than M)
    103		 * Change to:                  (M >= P[i]) (M not_less than P[i])
    104		 */
    105		status =
    106		    acpi_ex_do_logical_op(AML_LOGICAL_LESS_OP, match_obj,
    107					  package_obj, &logical_result);
    108		if (ACPI_FAILURE(status)) {
    109			return (FALSE);
    110		}
    111		logical_result = (u8) ! logical_result;
    112		break;
    113
    114	case MATCH_MLT:
    115		/*
    116		 * True if less than: (P[i] < M)
    117		 * Change to:         (M > P[i])
    118		 */
    119		status =
    120		    acpi_ex_do_logical_op(AML_LOGICAL_GREATER_OP, match_obj,
    121					  package_obj, &logical_result);
    122		if (ACPI_FAILURE(status)) {
    123			return (FALSE);
    124		}
    125		break;
    126
    127	case MATCH_MGE:
    128		/*
    129		 * True if greater than or equal: (P[i] >= M) (P[i] not_less than M)
    130		 * Change to:                     (M <= P[i]) (M not_greater than P[i])
    131		 */
    132		status =
    133		    acpi_ex_do_logical_op(AML_LOGICAL_GREATER_OP, match_obj,
    134					  package_obj, &logical_result);
    135		if (ACPI_FAILURE(status)) {
    136			return (FALSE);
    137		}
    138		logical_result = (u8) ! logical_result;
    139		break;
    140
    141	case MATCH_MGT:
    142		/*
    143		 * True if greater than: (P[i] > M)
    144		 * Change to:            (M < P[i])
    145		 */
    146		status =
    147		    acpi_ex_do_logical_op(AML_LOGICAL_LESS_OP, match_obj,
    148					  package_obj, &logical_result);
    149		if (ACPI_FAILURE(status)) {
    150			return (FALSE);
    151		}
    152		break;
    153
    154	default:
    155
    156		/* Undefined */
    157
    158		return (FALSE);
    159	}
    160
    161	return (logical_result);
    162}
    163
    164/*******************************************************************************
    165 *
    166 * FUNCTION:    acpi_ex_opcode_6A_0T_1R
    167 *
    168 * PARAMETERS:  walk_state          - Current walk state
    169 *
    170 * RETURN:      Status
    171 *
    172 * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
    173 *
    174 ******************************************************************************/
    175
    176acpi_status acpi_ex_opcode_6A_0T_1R(struct acpi_walk_state *walk_state)
    177{
    178	union acpi_operand_object **operand = &walk_state->operands[0];
    179	union acpi_operand_object *return_desc = NULL;
    180	acpi_status status = AE_OK;
    181	u64 index;
    182	union acpi_operand_object *this_element;
    183
    184	ACPI_FUNCTION_TRACE_STR(ex_opcode_6A_0T_1R,
    185				acpi_ps_get_opcode_name(walk_state->opcode));
    186
    187	switch (walk_state->opcode) {
    188	case AML_MATCH_OP:
    189		/*
    190		 * Match (search_pkg[0], match_op1[1], match_obj1[2],
    191		 *                      match_op2[3], match_obj2[4], start_index[5])
    192		 */
    193
    194		/* Validate both Match Term Operators (MTR, MEQ, etc.) */
    195
    196		if ((operand[1]->integer.value > MAX_MATCH_OPERATOR) ||
    197		    (operand[3]->integer.value > MAX_MATCH_OPERATOR)) {
    198			ACPI_ERROR((AE_INFO, "Match operator out of range"));
    199			status = AE_AML_OPERAND_VALUE;
    200			goto cleanup;
    201		}
    202
    203		/* Get the package start_index, validate against the package length */
    204
    205		index = operand[5]->integer.value;
    206		if (index >= operand[0]->package.count) {
    207			ACPI_ERROR((AE_INFO,
    208				    "Index (0x%8.8X%8.8X) beyond package end (0x%X)",
    209				    ACPI_FORMAT_UINT64(index),
    210				    operand[0]->package.count));
    211			status = AE_AML_PACKAGE_LIMIT;
    212			goto cleanup;
    213		}
    214
    215		/* Create an integer for the return value */
    216		/* Default return value is ACPI_UINT64_MAX if no match found */
    217
    218		return_desc = acpi_ut_create_integer_object(ACPI_UINT64_MAX);
    219		if (!return_desc) {
    220			status = AE_NO_MEMORY;
    221			goto cleanup;
    222
    223		}
    224
    225		/*
    226		 * Examine each element until a match is found. Both match conditions
    227		 * must be satisfied for a match to occur. Within the loop,
    228		 * "continue" signifies that the current element does not match
    229		 * and the next should be examined.
    230		 *
    231		 * Upon finding a match, the loop will terminate via "break" at
    232		 * the bottom. If it terminates "normally", match_value will be
    233		 * ACPI_UINT64_MAX (Ones) (its initial value) indicating that no
    234		 * match was found.
    235		 */
    236		for (; index < operand[0]->package.count; index++) {
    237
    238			/* Get the current package element */
    239
    240			this_element = operand[0]->package.elements[index];
    241
    242			/* Treat any uninitialized (NULL) elements as non-matching */
    243
    244			if (!this_element) {
    245				continue;
    246			}
    247
    248			/*
    249			 * Both match conditions must be satisfied. Execution of a continue
    250			 * (proceed to next iteration of enclosing for loop) signifies a
    251			 * non-match.
    252			 */
    253			if (!acpi_ex_do_match((u32) operand[1]->integer.value,
    254					      this_element, operand[2])) {
    255				continue;
    256			}
    257
    258			if (!acpi_ex_do_match((u32) operand[3]->integer.value,
    259					      this_element, operand[4])) {
    260				continue;
    261			}
    262
    263			/* Match found: Index is the return value */
    264
    265			return_desc->integer.value = index;
    266			break;
    267		}
    268		break;
    269
    270	case AML_LOAD_TABLE_OP:
    271
    272		status = acpi_ex_load_table_op(walk_state, &return_desc);
    273		break;
    274
    275	default:
    276
    277		ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
    278			    walk_state->opcode));
    279
    280		status = AE_AML_BAD_OPCODE;
    281		goto cleanup;
    282	}
    283
    284cleanup:
    285
    286	/* Delete return object on error */
    287
    288	if (ACPI_FAILURE(status)) {
    289		acpi_ut_remove_reference(return_desc);
    290	}
    291
    292	/* Save return object on success */
    293
    294	else {
    295		walk_state->result_obj = return_desc;
    296	}
    297
    298	return_ACPI_STATUS(status);
    299}