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 - 2020, 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 17 ACPI_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 */ 41 static u8 42 acpi_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 62 static u8 63 acpi_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 ******************************************************************************/ 175 176 acpi_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 } 283 284 cleanup: 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 } 300