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 - 2019, 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 }