1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: nsparse - namespace interface to AML parser
5 *
6 * Copyright (C) 2000 - 2022, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acnamesp.h"
13 #include "acparser.h"
14 #include "acdispat.h"
15 #include "actables.h"
16 #include "acinterp.h"
17
18 #define _COMPONENT ACPI_NAMESPACE
19 ACPI_MODULE_NAME("nsparse")
20
21 /*******************************************************************************
22 *
23 * FUNCTION: ns_execute_table
24 *
25 * PARAMETERS: table_desc - An ACPI table descriptor for table to parse
26 * start_node - Where to enter the table into the namespace
27 *
28 * RETURN: Status
29 *
30 * DESCRIPTION: Load ACPI/AML table by executing the entire table as a single
31 * large control method.
32 *
33 * NOTE: The point of this is to execute any module-level code in-place
34 * as the table is parsed. Some AML code depends on this behavior.
35 *
36 * It is a run-time option at this time, but will eventually become
37 * the default.
38 *
39 * Note: This causes the table to only have a single-pass parse.
40 * However, this is compatible with other ACPI implementations.
41 *
42 ******************************************************************************/
43 acpi_status
acpi_ns_execute_table(u32 table_index,struct acpi_namespace_node * start_node)44 acpi_ns_execute_table(u32 table_index, struct acpi_namespace_node *start_node)
45 {
46 acpi_status status;
47 struct acpi_table_header *table;
48 acpi_owner_id owner_id;
49 struct acpi_evaluate_info *info = NULL;
50 u32 aml_length;
51 u8 *aml_start;
52 union acpi_operand_object *method_obj = NULL;
53
54 ACPI_FUNCTION_TRACE(ns_execute_table);
55
56 status = acpi_get_table_by_index(table_index, &table);
57 if (ACPI_FAILURE(status)) {
58 return_ACPI_STATUS(status);
59 }
60
61 /* Table must consist of at least a complete header */
62
63 if (table->length < sizeof(struct acpi_table_header)) {
64 return_ACPI_STATUS(AE_BAD_HEADER);
65 }
66
67 aml_start = (u8 *)table + sizeof(struct acpi_table_header);
68 aml_length = table->length - sizeof(struct acpi_table_header);
69
70 status = acpi_tb_get_owner_id(table_index, &owner_id);
71 if (ACPI_FAILURE(status)) {
72 return_ACPI_STATUS(status);
73 }
74
75 /* Create, initialize, and link a new temporary method object */
76
77 method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
78 if (!method_obj) {
79 return_ACPI_STATUS(AE_NO_MEMORY);
80 }
81
82 /* Allocate the evaluation information block */
83
84 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
85 if (!info) {
86 status = AE_NO_MEMORY;
87 goto cleanup;
88 }
89
90 ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
91 "%s: Create table pseudo-method for [%4.4s] @%p, method %p\n",
92 ACPI_GET_FUNCTION_NAME, table->signature, table,
93 method_obj));
94
95 method_obj->method.aml_start = aml_start;
96 method_obj->method.aml_length = aml_length;
97 method_obj->method.owner_id = owner_id;
98 method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL;
99
100 info->pass_number = ACPI_IMODE_EXECUTE;
101 info->node = start_node;
102 info->obj_desc = method_obj;
103 info->node_flags = info->node->flags;
104 info->full_pathname = acpi_ns_get_normalized_pathname(info->node, TRUE);
105 if (!info->full_pathname) {
106 status = AE_NO_MEMORY;
107 goto cleanup;
108 }
109
110 /* Optional object evaluation log */
111
112 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
113 "%-26s: (Definition Block level)\n",
114 "Module-level evaluation"));
115
116 status = acpi_ps_execute_table(info);
117
118 /* Optional object evaluation log */
119
120 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
121 "%-26s: (Definition Block level)\n",
122 "Module-level complete"));
123
124 cleanup:
125 if (info) {
126 ACPI_FREE(info->full_pathname);
127 info->full_pathname = NULL;
128 }
129 ACPI_FREE(info);
130 acpi_ut_remove_reference(method_obj);
131 return_ACPI_STATUS(status);
132 }
133
134 /*******************************************************************************
135 *
136 * FUNCTION: ns_one_complete_parse
137 *
138 * PARAMETERS: pass_number - 1 or 2
139 * table_desc - The table to be parsed.
140 *
141 * RETURN: Status
142 *
143 * DESCRIPTION: Perform one complete parse of an ACPI/AML table.
144 *
145 ******************************************************************************/
146
147 acpi_status
acpi_ns_one_complete_parse(u32 pass_number,u32 table_index,struct acpi_namespace_node * start_node)148 acpi_ns_one_complete_parse(u32 pass_number,
149 u32 table_index,
150 struct acpi_namespace_node *start_node)
151 {
152 union acpi_parse_object *parse_root;
153 acpi_status status;
154 u32 aml_length;
155 u8 *aml_start;
156 struct acpi_walk_state *walk_state;
157 struct acpi_table_header *table;
158 acpi_owner_id owner_id;
159
160 ACPI_FUNCTION_TRACE(ns_one_complete_parse);
161
162 status = acpi_get_table_by_index(table_index, &table);
163 if (ACPI_FAILURE(status)) {
164 return_ACPI_STATUS(status);
165 }
166
167 /* Table must consist of at least a complete header */
168
169 if (table->length < sizeof(struct acpi_table_header)) {
170 return_ACPI_STATUS(AE_BAD_HEADER);
171 }
172
173 aml_start = (u8 *)table + sizeof(struct acpi_table_header);
174 aml_length = table->length - sizeof(struct acpi_table_header);
175
176 status = acpi_tb_get_owner_id(table_index, &owner_id);
177 if (ACPI_FAILURE(status)) {
178 return_ACPI_STATUS(status);
179 }
180
181 /* Create and init a Root Node */
182
183 parse_root = acpi_ps_create_scope_op(aml_start);
184 if (!parse_root) {
185 return_ACPI_STATUS(AE_NO_MEMORY);
186 }
187
188 /* Create and initialize a new walk state */
189
190 walk_state = acpi_ds_create_walk_state(owner_id, NULL, NULL, NULL);
191 if (!walk_state) {
192 acpi_ps_free_op(parse_root);
193 return_ACPI_STATUS(AE_NO_MEMORY);
194 }
195
196 status = acpi_ds_init_aml_walk(walk_state, parse_root, NULL,
197 aml_start, aml_length, NULL,
198 (u8)pass_number);
199 if (ACPI_FAILURE(status)) {
200 acpi_ds_delete_walk_state(walk_state);
201 goto cleanup;
202 }
203
204 /* Found OSDT table, enable the namespace override feature */
205
206 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_OSDT) &&
207 pass_number == ACPI_IMODE_LOAD_PASS1) {
208 walk_state->namespace_override = TRUE;
209 }
210
211 /* start_node is the default location to load the table */
212
213 if (start_node && start_node != acpi_gbl_root_node) {
214 status =
215 acpi_ds_scope_stack_push(start_node, ACPI_TYPE_METHOD,
216 walk_state);
217 if (ACPI_FAILURE(status)) {
218 acpi_ds_delete_walk_state(walk_state);
219 goto cleanup;
220 }
221 }
222
223 /* Parse the AML */
224
225 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
226 "*PARSE* pass %u parse\n", pass_number));
227 acpi_ex_enter_interpreter();
228 status = acpi_ps_parse_aml(walk_state);
229 acpi_ex_exit_interpreter();
230
231 cleanup:
232 acpi_ps_delete_parse_tree(parse_root);
233 return_ACPI_STATUS(status);
234 }
235
236 /*******************************************************************************
237 *
238 * FUNCTION: acpi_ns_parse_table
239 *
240 * PARAMETERS: table_desc - An ACPI table descriptor for table to parse
241 * start_node - Where to enter the table into the namespace
242 *
243 * RETURN: Status
244 *
245 * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
246 *
247 ******************************************************************************/
248
249 acpi_status
acpi_ns_parse_table(u32 table_index,struct acpi_namespace_node * start_node)250 acpi_ns_parse_table(u32 table_index, struct acpi_namespace_node *start_node)
251 {
252 acpi_status status;
253
254 ACPI_FUNCTION_TRACE(ns_parse_table);
255
256 /*
257 * Executes the AML table as one large control method.
258 * The point of this is to execute any module-level code in-place
259 * as the table is parsed. Some AML code depends on this behavior.
260 *
261 * Note: This causes the table to only have a single-pass parse.
262 * However, this is compatible with other ACPI implementations.
263 */
264 ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
265 "%s: **** Start table execution pass\n",
266 ACPI_GET_FUNCTION_NAME));
267
268 status = acpi_ns_execute_table(table_index, start_node);
269
270 return_ACPI_STATUS(status);
271 }
272