1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: psxface - Parser external interfaces
5 *
6 * Copyright (C) 2000 - 2019, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acparser.h"
13 #include "acdispat.h"
14 #include "acinterp.h"
15 #include "actables.h"
16 #include "acnamesp.h"
17
18 #define _COMPONENT ACPI_PARSER
19 ACPI_MODULE_NAME("psxface")
20
21 /* Local Prototypes */
22 static void
23 acpi_ps_update_parameter_list(struct acpi_evaluate_info *info, u16 action);
24
25 /*******************************************************************************
26 *
27 * FUNCTION: acpi_debug_trace
28 *
29 * PARAMETERS: method_name - Valid ACPI name string
30 * debug_level - Optional level mask. 0 to use default
31 * debug_layer - Optional layer mask. 0 to use default
32 * flags - bit 1: one shot(1) or persistent(0)
33 *
34 * RETURN: Status
35 *
36 * DESCRIPTION: External interface to enable debug tracing during control
37 * method execution
38 *
39 ******************************************************************************/
40
41 acpi_status
42 acpi_debug_trace(const char *name, u32 debug_level, u32 debug_layer, u32 flags)
43 {
44 acpi_status status;
45
46 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
47 if (ACPI_FAILURE(status)) {
48 return (status);
49 }
50
51 acpi_gbl_trace_method_name = name;
52 acpi_gbl_trace_flags = flags;
53 acpi_gbl_trace_dbg_level = debug_level;
54 acpi_gbl_trace_dbg_layer = debug_layer;
55 status = AE_OK;
56
57 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
58 return (status);
59 }
60
61 /*******************************************************************************
62 *
63 * FUNCTION: acpi_ps_execute_method
64 *
65 * PARAMETERS: info - Method info block, contains:
66 * node - Method Node to execute
67 * obj_desc - Method object
68 * parameters - List of parameters to pass to the method,
69 * terminated by NULL. Params itself may be
70 * NULL if no parameters are being passed.
71 * return_object - Where to put method's return value (if
72 * any). If NULL, no value is returned.
73 * parameter_type - Type of Parameter list
74 * return_object - Where to put method's return value (if
75 * any). If NULL, no value is returned.
76 * pass_number - Parse or execute pass
77 *
78 * RETURN: Status
79 *
80 * DESCRIPTION: Execute a control method
81 *
82 ******************************************************************************/
83
84 acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
85 {
86 acpi_status status;
87 union acpi_parse_object *op;
88 struct acpi_walk_state *walk_state;
89
90 ACPI_FUNCTION_TRACE(ps_execute_method);
91
92 /* Quick validation of DSDT header */
93
94 acpi_tb_check_dsdt_header();
95
96 /* Validate the Info and method Node */
97
98 if (!info || !info->node) {
99 return_ACPI_STATUS(AE_NULL_ENTRY);
100 }
101
102 /* Init for new method, wait on concurrency semaphore */
103
104 status =
105 acpi_ds_begin_method_execution(info->node, info->obj_desc, NULL);
106 if (ACPI_FAILURE(status)) {
107 return_ACPI_STATUS(status);
108 }
109
110 /*
111 * The caller "owns" the parameters, so give each one an extra reference
112 */
113 acpi_ps_update_parameter_list(info, REF_INCREMENT);
114
115 /*
116 * Execute the method. Performs parse simultaneously
117 */
118 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
119 "**** Begin Method Parse/Execute [%4.4s] **** Node=%p Obj=%p\n",
120 info->node->name.ascii, info->node, info->obj_desc));
121
122 /* Create and init a Root Node */
123
124 op = acpi_ps_create_scope_op(info->obj_desc->method.aml_start);
125 if (!op) {
126 status = AE_NO_MEMORY;
127 goto cleanup;
128 }
129
130 /* Create and initialize a new walk state */
131
132 info->pass_number = ACPI_IMODE_EXECUTE;
133 walk_state =
134 acpi_ds_create_walk_state(info->obj_desc->method.owner_id, NULL,
135 NULL, NULL);
136 if (!walk_state) {
137 status = AE_NO_MEMORY;
138 goto cleanup;
139 }
140
141 status = acpi_ds_init_aml_walk(walk_state, op, info->node,
142 info->obj_desc->method.aml_start,
143 info->obj_desc->method.aml_length, info,
144 info->pass_number);
145 if (ACPI_FAILURE(status)) {
146 acpi_ds_delete_walk_state(walk_state);
147 goto cleanup;
148 }
149
150 walk_state->method_pathname = info->full_pathname;
151 walk_state->method_is_nested = FALSE;
152
153 if (info->obj_desc->method.info_flags & ACPI_METHOD_MODULE_LEVEL) {
154 walk_state->parse_flags |= ACPI_PARSE_MODULE_LEVEL;
155 }
156
157 /* Invoke an internal method if necessary */
158
159 if (info->obj_desc->method.info_flags & ACPI_METHOD_INTERNAL_ONLY) {
160 status =
161 info->obj_desc->method.dispatch.implementation(walk_state);
162 info->return_object = walk_state->return_desc;
163
164 /* Cleanup states */
165
166 acpi_ds_scope_stack_clear(walk_state);
167 acpi_ps_cleanup_scope(&walk_state->parser_state);
168 acpi_ds_terminate_control_method(walk_state->method_desc,
169 walk_state);
170 acpi_ds_delete_walk_state(walk_state);
171 goto cleanup;
172 }
173
174 /*
175 * Start method evaluation with an implicit return of zero.
176 * This is done for Windows compatibility.
177 */
178 if (acpi_gbl_enable_interpreter_slack) {
179 walk_state->implicit_return_obj =
180 acpi_ut_create_integer_object((u64) 0);
181 if (!walk_state->implicit_return_obj) {
182 status = AE_NO_MEMORY;
183 acpi_ds_delete_walk_state(walk_state);
184 goto cleanup;
185 }
186 }
187
188 /* Parse the AML */
189
190 status = acpi_ps_parse_aml(walk_state);
191
192 /* walk_state was deleted by parse_aml */
193
194 cleanup:
195 acpi_ps_delete_parse_tree(op);
196
197 /* Take away the extra reference that we gave the parameters above */
198
199 acpi_ps_update_parameter_list(info, REF_DECREMENT);
200
201 /* Exit now if error above */
202
203 if (ACPI_FAILURE(status)) {
204 return_ACPI_STATUS(status);
205 }
206
207 /*
208 * If the method has returned an object, signal this to the caller with
209 * a control exception code
210 */
211 if (info->return_object) {
212 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Method returned ObjDesc=%p\n",
213 info->return_object));
214 ACPI_DUMP_STACK_ENTRY(info->return_object);
215
216 status = AE_CTRL_RETURN_VALUE;
217 }
218
219 return_ACPI_STATUS(status);
220 }
221
222 /*******************************************************************************
223 *
224 * FUNCTION: acpi_ps_execute_table
225 *
226 * PARAMETERS: info - Method info block, contains:
227 * node - Node to where the is entered into the
228 * namespace
229 * obj_desc - Pseudo method object describing the AML
230 * code of the entire table
231 * pass_number - Parse or execute pass
232 *
233 * RETURN: Status
234 *
235 * DESCRIPTION: Execute a table
236 *
237 ******************************************************************************/
238
239 acpi_status acpi_ps_execute_table(struct acpi_evaluate_info *info)
240 {
241 acpi_status status;
242 union acpi_parse_object *op = NULL;
243 struct acpi_walk_state *walk_state = NULL;
244
245 ACPI_FUNCTION_TRACE(ps_execute_table);
246
247 /* Create and init a Root Node */
248
249 op = acpi_ps_create_scope_op(info->obj_desc->method.aml_start);
250 if (!op) {
251 status = AE_NO_MEMORY;
252 goto cleanup;
253 }
254
255 /* Create and initialize a new walk state */
256
257 walk_state =
258 acpi_ds_create_walk_state(info->obj_desc->method.owner_id, NULL,
259 NULL, NULL);
260 if (!walk_state) {
261 status = AE_NO_MEMORY;
262 goto cleanup;
263 }
264
265 status = acpi_ds_init_aml_walk(walk_state, op, info->node,
266 info->obj_desc->method.aml_start,
267 info->obj_desc->method.aml_length, info,
268 info->pass_number);
269 if (ACPI_FAILURE(status)) {
270 goto cleanup;
271 }
272
273 walk_state->method_pathname = info->full_pathname;
274 walk_state->method_is_nested = FALSE;
275
276 if (info->obj_desc->method.info_flags & ACPI_METHOD_MODULE_LEVEL) {
277 walk_state->parse_flags |= ACPI_PARSE_MODULE_LEVEL;
278 }
279
280 /* Info->Node is the default location to load the table */
281
282 if (info->node && info->node != acpi_gbl_root_node) {
283 status =
284 acpi_ds_scope_stack_push(info->node, ACPI_TYPE_METHOD,
285 walk_state);
286 if (ACPI_FAILURE(status)) {
287 goto cleanup;
288 }
289 }
290
291 /*
292 * Parse the AML, walk_state will be deleted by parse_aml
293 */
294 acpi_ex_enter_interpreter();
295 status = acpi_ps_parse_aml(walk_state);
296 acpi_ex_exit_interpreter();
297 walk_state = NULL;
298
299 cleanup:
300 if (walk_state) {
301 acpi_ds_delete_walk_state(walk_state);
302 }
303 if (op) {
304 acpi_ps_delete_parse_tree(op);
305 }
306 return_ACPI_STATUS(status);
307 }
308
309 /*******************************************************************************
310 *
311 * FUNCTION: acpi_ps_update_parameter_list
312 *
313 * PARAMETERS: info - See struct acpi_evaluate_info
314 * (Used: parameter_type and Parameters)
315 * action - Add or Remove reference
316 *
317 * RETURN: Status
318 *
319 * DESCRIPTION: Update reference count on all method parameter objects
320 *
321 ******************************************************************************/
322
323 static void
324 acpi_ps_update_parameter_list(struct acpi_evaluate_info *info, u16 action)
325 {
326 u32 i;
327
328 if (info->parameters) {
329
330 /* Update reference count for each parameter */
331
332 for (i = 0; info->parameters[i]; i++) {
333
334 /* Ignore errors, just do them all */
335
336 (void)acpi_ut_update_object_reference(info->
337 parameters[i],
338 action);
339 }
340 }
341 }