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authorBob Moore <robert.moore@intel.com>2008-04-10 11:06:36 -0400
committerLen Brown <len.brown@intel.com>2008-04-22 14:29:20 -0400
commit773069d48030e670cf2032a13ddf16a2e0034df3 (patch)
tree2f45fd7e90600d26c08c641c75059eb0b15d6dcd /drivers/acpi/dispatcher/dswstate.c
parent4b119e21d0c66c22e8ca03df05d9de623d0eb50f (diff)
ACPICA: Several fixes for internal method result stack
fixes STACK_OVERFLOW exception on nested method calls. internal bugzilla 262 and 275. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/dispatcher/dswstate.c')
-rw-r--r--drivers/acpi/dispatcher/dswstate.c513
1 files changed, 111 insertions, 402 deletions
diff --git a/drivers/acpi/dispatcher/dswstate.c b/drivers/acpi/dispatcher/dswstate.c
index 5afcdd9c7449..698d2e1c219e 100644
--- a/drivers/acpi/dispatcher/dswstate.c
+++ b/drivers/acpi/dispatcher/dswstate.c
@@ -49,85 +49,9 @@
49#define _COMPONENT ACPI_DISPATCHER 49#define _COMPONENT ACPI_DISPATCHER
50ACPI_MODULE_NAME("dswstate") 50ACPI_MODULE_NAME("dswstate")
51 51
52/* Local prototypes */ 52 /* Local prototypes */
53#ifdef ACPI_OBSOLETE_FUNCTIONS 53static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *ws);
54acpi_status 54static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *ws);
55acpi_ds_result_insert(void *object,
56 u32 index, struct acpi_walk_state *walk_state);
57
58acpi_status acpi_ds_obj_stack_delete_all(struct acpi_walk_state *walk_state);
59
60acpi_status
61acpi_ds_obj_stack_pop_object(union acpi_operand_object **object,
62 struct acpi_walk_state *walk_state);
63
64void *acpi_ds_obj_stack_get_value(u32 index,
65 struct acpi_walk_state *walk_state);
66#endif
67
68#ifdef ACPI_FUTURE_USAGE
69/*******************************************************************************
70 *
71 * FUNCTION: acpi_ds_result_remove
72 *
73 * PARAMETERS: Object - Where to return the popped object
74 * Index - Where to extract the object
75 * walk_state - Current Walk state
76 *
77 * RETURN: Status
78 *
79 * DESCRIPTION: Pop an object off the bottom of this walk's result stack. In
80 * other words, this is a FIFO.
81 *
82 ******************************************************************************/
83
84acpi_status
85acpi_ds_result_remove(union acpi_operand_object **object,
86 u32 index, struct acpi_walk_state *walk_state)
87{
88 union acpi_generic_state *state;
89
90 ACPI_FUNCTION_NAME(ds_result_remove);
91
92 state = walk_state->results;
93 if (!state) {
94 ACPI_ERROR((AE_INFO, "No result object pushed! State=%p",
95 walk_state));
96 return (AE_NOT_EXIST);
97 }
98
99 if (index >= ACPI_OBJ_MAX_OPERAND) {
100 ACPI_ERROR((AE_INFO,
101 "Index out of range: %X State=%p Num=%X",
102 index, walk_state, state->results.num_results));
103 }
104
105 /* Check for a valid result object */
106
107 if (!state->results.obj_desc[index]) {
108 ACPI_ERROR((AE_INFO,
109 "Null operand! State=%p #Ops=%X, Index=%X",
110 walk_state, state->results.num_results, index));
111 return (AE_AML_NO_RETURN_VALUE);
112 }
113
114 /* Remove the object */
115
116 state->results.num_results--;
117
118 *object = state->results.obj_desc[index];
119 state->results.obj_desc[index] = NULL;
120
121 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
122 "Obj=%p [%s] Index=%X State=%p Num=%X\n",
123 *object,
124 (*object) ? acpi_ut_get_object_type_name(*object) :
125 "NULL", index, walk_state,
126 state->results.num_results));
127
128 return (AE_OK);
129}
130#endif /* ACPI_FUTURE_USAGE */
131 55
132/******************************************************************************* 56/*******************************************************************************
133 * 57 *
@@ -138,122 +62,67 @@ acpi_ds_result_remove(union acpi_operand_object **object,
138 * 62 *
139 * RETURN: Status 63 * RETURN: Status
140 * 64 *
141 * DESCRIPTION: Pop an object off the bottom of this walk's result stack. In 65 * DESCRIPTION: Pop an object off the top of this walk's result stack
142 * other words, this is a FIFO.
143 * 66 *
144 ******************************************************************************/ 67 ******************************************************************************/
145 68
146acpi_status 69acpi_status
147acpi_ds_result_pop(union acpi_operand_object ** object, 70acpi_ds_result_pop(union acpi_operand_object **object,
148 struct acpi_walk_state * walk_state) 71 struct acpi_walk_state *walk_state)
149{ 72{
150 acpi_native_uint index; 73 acpi_native_uint index;
151 union acpi_generic_state *state; 74 union acpi_generic_state *state;
75 acpi_status status;
152 76
153 ACPI_FUNCTION_NAME(ds_result_pop); 77 ACPI_FUNCTION_NAME(ds_result_pop);
154 78
155 state = walk_state->results; 79 state = walk_state->results;
156 if (!state) {
157 return (AE_OK);
158 }
159
160 if (!state->results.num_results) {
161 ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p",
162 walk_state));
163 return (AE_AML_NO_RETURN_VALUE);
164 }
165 80
166 /* Remove top element */ 81 /* Incorrect state of result stack */
167 82
168 state->results.num_results--; 83 if (state && !walk_state->result_count) {
169 84 ACPI_ERROR((AE_INFO, "No results on result stack"));
170 for (index = ACPI_OBJ_NUM_OPERANDS; index; index--) { 85 return (AE_AML_INTERNAL);
171
172 /* Check for a valid result object */
173
174 if (state->results.obj_desc[index - 1]) {
175 *object = state->results.obj_desc[index - 1];
176 state->results.obj_desc[index - 1] = NULL;
177
178 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
179 "Obj=%p [%s] Index=%X State=%p Num=%X\n",
180 *object,
181 (*object) ?
182 acpi_ut_get_object_type_name(*object)
183 : "NULL", (u32) index - 1, walk_state,
184 state->results.num_results));
185
186 return (AE_OK);
187 }
188 } 86 }
189 87
190 ACPI_ERROR((AE_INFO, "No result objects! State=%p", walk_state)); 88 if (!state && walk_state->result_count) {
191 return (AE_AML_NO_RETURN_VALUE); 89 ACPI_ERROR((AE_INFO, "No result state for result stack"));
192} 90 return (AE_AML_INTERNAL);
193 91 }
194/*******************************************************************************
195 *
196 * FUNCTION: acpi_ds_result_pop_from_bottom
197 *
198 * PARAMETERS: Object - Where to return the popped object
199 * walk_state - Current Walk state
200 *
201 * RETURN: Status
202 *
203 * DESCRIPTION: Pop an object off the bottom of this walk's result stack. In
204 * other words, this is a FIFO.
205 *
206 ******************************************************************************/
207
208acpi_status
209acpi_ds_result_pop_from_bottom(union acpi_operand_object ** object,
210 struct acpi_walk_state * walk_state)
211{
212 acpi_native_uint index;
213 union acpi_generic_state *state;
214 92
215 ACPI_FUNCTION_NAME(ds_result_pop_from_bottom); 93 /* Empty result stack */
216 94
217 state = walk_state->results;
218 if (!state) { 95 if (!state) {
219 ACPI_ERROR((AE_INFO, 96 ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p",
220 "No result object pushed! State=%p", walk_state));
221 return (AE_NOT_EXIST);
222 }
223
224 if (!state->results.num_results) {
225 ACPI_ERROR((AE_INFO, "No result objects! State=%p",
226 walk_state)); 97 walk_state));
227 return (AE_AML_NO_RETURN_VALUE); 98 return (AE_AML_NO_RETURN_VALUE);
228 } 99 }
229 100
230 /* Remove Bottom element */ 101 /* Return object of the top element and clean that top element result stack */
231
232 *object = state->results.obj_desc[0];
233
234 /* Push entire stack down one element */
235
236 for (index = 0; index < state->results.num_results; index++) {
237 state->results.obj_desc[index] =
238 state->results.obj_desc[index + 1];
239 }
240 102
241 state->results.num_results--; 103 walk_state->result_count--;
242 104 index = walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
243 /* Check for a valid result object */
244 105
106 *object = state->results.obj_desc[index];
245 if (!*object) { 107 if (!*object) {
246 ACPI_ERROR((AE_INFO, 108 ACPI_ERROR((AE_INFO,
247 "Null operand! State=%p #Ops=%X Index=%X", 109 "No result objects on result stack, State=%p",
248 walk_state, state->results.num_results, 110 walk_state));
249 (u32) index));
250 return (AE_AML_NO_RETURN_VALUE); 111 return (AE_AML_NO_RETURN_VALUE);
251 } 112 }
252 113
253 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] Results=%p State=%p\n", 114 state->results.obj_desc[index] = NULL;
254 *object, 115 if (index == 0) {
255 (*object) ? acpi_ut_get_object_type_name(*object) : 116 status = acpi_ds_result_stack_pop(walk_state);
256 "NULL", state, walk_state)); 117 if (ACPI_FAILURE(status)) {
118 return (status);
119 }
120 }
121
122 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
123 "Obj=%p [%s] Index=%X State=%p Num=%X\n", *object,
124 acpi_ut_get_object_type_name(*object),
125 (u32) index, walk_state, walk_state->result_count));
257 126
258 return (AE_OK); 127 return (AE_OK);
259} 128}
@@ -276,39 +145,56 @@ acpi_ds_result_push(union acpi_operand_object * object,
276 struct acpi_walk_state * walk_state) 145 struct acpi_walk_state * walk_state)
277{ 146{
278 union acpi_generic_state *state; 147 union acpi_generic_state *state;
148 acpi_status status;
149 acpi_native_uint index;
279 150
280 ACPI_FUNCTION_NAME(ds_result_push); 151 ACPI_FUNCTION_NAME(ds_result_push);
281 152
153 if (walk_state->result_count > walk_state->result_size) {
154 ACPI_ERROR((AE_INFO, "Result stack is full"));
155 return (AE_AML_INTERNAL);
156 } else if (walk_state->result_count == walk_state->result_size) {
157
158 /* Extend the result stack */
159
160 status = acpi_ds_result_stack_push(walk_state);
161 if (ACPI_FAILURE(status)) {
162 ACPI_ERROR((AE_INFO,
163 "Failed to extend the result stack"));
164 return (status);
165 }
166 }
167
168 if (!(walk_state->result_count < walk_state->result_size)) {
169 ACPI_ERROR((AE_INFO, "No free elements in result stack"));
170 return (AE_AML_INTERNAL);
171 }
172
282 state = walk_state->results; 173 state = walk_state->results;
283 if (!state) { 174 if (!state) {
284 ACPI_ERROR((AE_INFO, "No result stack frame during push")); 175 ACPI_ERROR((AE_INFO, "No result stack frame during push"));
285 return (AE_AML_INTERNAL); 176 return (AE_AML_INTERNAL);
286 } 177 }
287 178
288 if (state->results.num_results == ACPI_OBJ_NUM_OPERANDS) {
289 ACPI_ERROR((AE_INFO,
290 "Result stack overflow: Obj=%p State=%p Num=%X",
291 object, walk_state, state->results.num_results));
292 return (AE_STACK_OVERFLOW);
293 }
294
295 if (!object) { 179 if (!object) {
296 ACPI_ERROR((AE_INFO, 180 ACPI_ERROR((AE_INFO,
297 "Null Object! Obj=%p State=%p Num=%X", 181 "Null Object! Obj=%p State=%p Num=%X",
298 object, walk_state, state->results.num_results)); 182 object, walk_state, walk_state->result_count));
299 return (AE_BAD_PARAMETER); 183 return (AE_BAD_PARAMETER);
300 } 184 }
301 185
302 state->results.obj_desc[state->results.num_results] = object; 186 /* Assign the address of object to the top free element of result stack */
303 state->results.num_results++; 187
188 index = walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
189 state->results.obj_desc[index] = object;
190 walk_state->result_count++;
304 191
305 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n", 192 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
306 object, 193 object,
307 object ?
308 acpi_ut_get_object_type_name((union 194 acpi_ut_get_object_type_name((union
309 acpi_operand_object *) 195 acpi_operand_object *)
310 object) : "NULL", 196 object), walk_state,
311 walk_state, state->results.num_results, 197 walk_state->result_count,
312 walk_state->current_result)); 198 walk_state->current_result));
313 199
314 return (AE_OK); 200 return (AE_OK);
@@ -322,16 +208,25 @@ acpi_ds_result_push(union acpi_operand_object * object,
322 * 208 *
323 * RETURN: Status 209 * RETURN: Status
324 * 210 *
325 * DESCRIPTION: Push an object onto the walk_state result stack. 211 * DESCRIPTION: Push an object onto the walk_state result stack
326 * 212 *
327 ******************************************************************************/ 213 ******************************************************************************/
328 214
329acpi_status acpi_ds_result_stack_push(struct acpi_walk_state * walk_state) 215static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *walk_state)
330{ 216{
331 union acpi_generic_state *state; 217 union acpi_generic_state *state;
332 218
333 ACPI_FUNCTION_NAME(ds_result_stack_push); 219 ACPI_FUNCTION_NAME(ds_result_stack_push);
334 220
221 /* Check for stack overflow */
222
223 if ((walk_state->result_size + ACPI_RESULTS_FRAME_OBJ_NUM) >
224 ACPI_RESULTS_OBJ_NUM_MAX) {
225 ACPI_ERROR((AE_INFO, "Result stack overflow: State=%p Num=%X",
226 walk_state, walk_state->result_size));
227 return (AE_STACK_OVERFLOW);
228 }
229
335 state = acpi_ut_create_generic_state(); 230 state = acpi_ut_create_generic_state();
336 if (!state) { 231 if (!state) {
337 return (AE_NO_MEMORY); 232 return (AE_NO_MEMORY);
@@ -340,6 +235,10 @@ acpi_status acpi_ds_result_stack_push(struct acpi_walk_state * walk_state)
340 state->common.descriptor_type = ACPI_DESC_TYPE_STATE_RESULT; 235 state->common.descriptor_type = ACPI_DESC_TYPE_STATE_RESULT;
341 acpi_ut_push_generic_state(&walk_state->results, state); 236 acpi_ut_push_generic_state(&walk_state->results, state);
342 237
238 /* Increase the length of the result stack by the length of frame */
239
240 walk_state->result_size += ACPI_RESULTS_FRAME_OBJ_NUM;
241
343 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n", 242 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n",
344 state, walk_state)); 243 state, walk_state));
345 244
@@ -354,11 +253,11 @@ acpi_status acpi_ds_result_stack_push(struct acpi_walk_state * walk_state)
354 * 253 *
355 * RETURN: Status 254 * RETURN: Status
356 * 255 *
357 * DESCRIPTION: Pop an object off of the walk_state result stack. 256 * DESCRIPTION: Pop an object off of the walk_state result stack
358 * 257 *
359 ******************************************************************************/ 258 ******************************************************************************/
360 259
361acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state * walk_state) 260static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state)
362{ 261{
363 union acpi_generic_state *state; 262 union acpi_generic_state *state;
364 263
@@ -367,18 +266,27 @@ acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state * walk_state)
367 /* Check for stack underflow */ 266 /* Check for stack underflow */
368 267
369 if (walk_state->results == NULL) { 268 if (walk_state->results == NULL) {
370 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Underflow - State=%p\n", 269 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
270 "Result stack underflow - State=%p\n",
371 walk_state)); 271 walk_state));
372 return (AE_AML_NO_OPERAND); 272 return (AE_AML_NO_OPERAND);
373 } 273 }
374 274
275 if (walk_state->result_size < ACPI_RESULTS_FRAME_OBJ_NUM) {
276 ACPI_ERROR((AE_INFO, "Insufficient result stack size"));
277 return (AE_AML_INTERNAL);
278 }
279
375 state = acpi_ut_pop_generic_state(&walk_state->results); 280 state = acpi_ut_pop_generic_state(&walk_state->results);
281 acpi_ut_delete_generic_state(state);
282
283 /* Decrease the length of result stack by the length of frame */
284
285 walk_state->result_size -= ACPI_RESULTS_FRAME_OBJ_NUM;
376 286
377 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 287 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
378 "Result=%p RemainingResults=%X State=%p\n", 288 "Result=%p RemainingResults=%X State=%p\n",
379 state, state->results.num_results, walk_state)); 289 state, walk_state->result_count, walk_state));
380
381 acpi_ut_delete_generic_state(state);
382 290
383 return (AE_OK); 291 return (AE_OK);
384} 292}
@@ -412,9 +320,13 @@ acpi_ds_obj_stack_push(void *object, struct acpi_walk_state * walk_state)
412 320
413 /* Put the object onto the stack */ 321 /* Put the object onto the stack */
414 322
415 walk_state->operands[walk_state->num_operands] = object; 323 walk_state->operands[walk_state->operand_index] = object;
416 walk_state->num_operands++; 324 walk_state->num_operands++;
417 325
326 /* For the usual order of filling the operand stack */
327
328 walk_state->operand_index++;
329
418 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n", 330 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
419 object, 331 object,
420 acpi_ut_get_object_type_name((union 332 acpi_ut_get_object_type_name((union
@@ -484,43 +396,36 @@ acpi_ds_obj_stack_pop(u32 pop_count, struct acpi_walk_state * walk_state)
484 * 396 *
485 ******************************************************************************/ 397 ******************************************************************************/
486 398
487acpi_status 399void
488acpi_ds_obj_stack_pop_and_delete(u32 pop_count, 400acpi_ds_obj_stack_pop_and_delete(u32 pop_count,
489 struct acpi_walk_state * walk_state) 401 struct acpi_walk_state *walk_state)
490{ 402{
491 u32 i; 403 u32 i;
492 union acpi_operand_object *obj_desc; 404 union acpi_operand_object *obj_desc;
493 405
494 ACPI_FUNCTION_NAME(ds_obj_stack_pop_and_delete); 406 ACPI_FUNCTION_NAME(ds_obj_stack_pop_and_delete);
495 407
496 for (i = 0; i < pop_count; i++) { 408 if (pop_count == 0) {
497 409 return;
498 /* Check for stack underflow */ 410 }
499 411
412 for (i = (pop_count - 1); i >= 0; i--) {
500 if (walk_state->num_operands == 0) { 413 if (walk_state->num_operands == 0) {
501 ACPI_ERROR((AE_INFO, 414 return;
502 "Object stack underflow! Count=%X State=%p #Ops=%X",
503 pop_count, walk_state,
504 walk_state->num_operands));
505 return (AE_STACK_UNDERFLOW);
506 } 415 }
507 416
508 /* Pop the stack and delete an object if present in this stack entry */ 417 /* Pop the stack and delete an object if present in this stack entry */
509 418
510 walk_state->num_operands--; 419 walk_state->num_operands--;
511 obj_desc = walk_state->operands[walk_state->num_operands]; 420 obj_desc = walk_state->operands[i];
512 if (obj_desc) { 421 if (obj_desc) {
513 acpi_ut_remove_reference(walk_state-> 422 acpi_ut_remove_reference(walk_state->operands[i]);
514 operands[walk_state-> 423 walk_state->operands[i] = NULL;
515 num_operands]);
516 walk_state->operands[walk_state->num_operands] = NULL;
517 } 424 }
518 } 425 }
519 426
520 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n", 427 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
521 pop_count, walk_state, walk_state->num_operands)); 428 pop_count, walk_state, walk_state->num_operands));
522
523 return (AE_OK);
524} 429}
525 430
526/******************************************************************************* 431/*******************************************************************************
@@ -560,7 +465,7 @@ struct acpi_walk_state *acpi_ds_get_current_walk_state(struct acpi_thread_state
560 * 465 *
561 * RETURN: None 466 * RETURN: None
562 * 467 *
563 * DESCRIPTION: Place the Thread state at the head of the state list. 468 * DESCRIPTION: Place the Thread state at the head of the state list
564 * 469 *
565 ******************************************************************************/ 470 ******************************************************************************/
566 471
@@ -636,7 +541,6 @@ struct acpi_walk_state *acpi_ds_create_walk_state(acpi_owner_id owner_id, union
636 *thread) 541 *thread)
637{ 542{
638 struct acpi_walk_state *walk_state; 543 struct acpi_walk_state *walk_state;
639 acpi_status status;
640 544
641 ACPI_FUNCTION_TRACE(ds_create_walk_state); 545 ACPI_FUNCTION_TRACE(ds_create_walk_state);
642 546
@@ -659,14 +563,6 @@ struct acpi_walk_state *acpi_ds_create_walk_state(acpi_owner_id owner_id, union
659 acpi_ds_method_data_init(walk_state); 563 acpi_ds_method_data_init(walk_state);
660#endif 564#endif
661 565
662 /* Create an initial result stack entry */
663
664 status = acpi_ds_result_stack_push(walk_state);
665 if (ACPI_FAILURE(status)) {
666 ACPI_FREE(walk_state);
667 return_PTR(NULL);
668 }
669
670 /* Put the new state at the head of the walk list */ 566 /* Put the new state at the head of the walk list */
671 567
672 if (thread) { 568 if (thread) {
@@ -860,190 +756,3 @@ void acpi_ds_delete_walk_state(struct acpi_walk_state *walk_state)
860 ACPI_FREE(walk_state); 756 ACPI_FREE(walk_state);
861 return_VOID; 757 return_VOID;
862} 758}
863
864#ifdef ACPI_OBSOLETE_FUNCTIONS
865/*******************************************************************************
866 *
867 * FUNCTION: acpi_ds_result_insert
868 *
869 * PARAMETERS: Object - Object to push
870 * Index - Where to insert the object
871 * walk_state - Current Walk state
872 *
873 * RETURN: Status
874 *
875 * DESCRIPTION: Insert an object onto this walk's result stack
876 *
877 ******************************************************************************/
878
879acpi_status
880acpi_ds_result_insert(void *object,
881 u32 index, struct acpi_walk_state *walk_state)
882{
883 union acpi_generic_state *state;
884
885 ACPI_FUNCTION_NAME(ds_result_insert);
886
887 state = walk_state->results;
888 if (!state) {
889 ACPI_ERROR((AE_INFO, "No result object pushed! State=%p",
890 walk_state));
891 return (AE_NOT_EXIST);
892 }
893
894 if (index >= ACPI_OBJ_NUM_OPERANDS) {
895 ACPI_ERROR((AE_INFO,
896 "Index out of range: %X Obj=%p State=%p Num=%X",
897 index, object, walk_state,
898 state->results.num_results));
899 return (AE_BAD_PARAMETER);
900 }
901
902 if (!object) {
903 ACPI_ERROR((AE_INFO,
904 "Null Object! Index=%X Obj=%p State=%p Num=%X",
905 index, object, walk_state,
906 state->results.num_results));
907 return (AE_BAD_PARAMETER);
908 }
909
910 state->results.obj_desc[index] = object;
911 state->results.num_results++;
912
913 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
914 "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
915 object,
916 object ?
917 acpi_ut_get_object_type_name((union
918 acpi_operand_object *)
919 object) : "NULL",
920 walk_state, state->results.num_results,
921 walk_state->current_result));
922
923 return (AE_OK);
924}
925
926/*******************************************************************************
927 *
928 * FUNCTION: acpi_ds_obj_stack_delete_all
929 *
930 * PARAMETERS: walk_state - Current Walk state
931 *
932 * RETURN: Status
933 *
934 * DESCRIPTION: Clear the object stack by deleting all objects that are on it.
935 * Should be used with great care, if at all!
936 *
937 ******************************************************************************/
938
939acpi_status acpi_ds_obj_stack_delete_all(struct acpi_walk_state * walk_state)
940{
941 u32 i;
942
943 ACPI_FUNCTION_TRACE_PTR(ds_obj_stack_delete_all, walk_state);
944
945 /* The stack size is configurable, but fixed */
946
947 for (i = 0; i < ACPI_OBJ_NUM_OPERANDS; i++) {
948 if (walk_state->operands[i]) {
949 acpi_ut_remove_reference(walk_state->operands[i]);
950 walk_state->operands[i] = NULL;
951 }
952 }
953
954 return_ACPI_STATUS(AE_OK);
955}
956
957/*******************************************************************************
958 *
959 * FUNCTION: acpi_ds_obj_stack_pop_object
960 *
961 * PARAMETERS: Object - Where to return the popped object
962 * walk_state - Current Walk state
963 *
964 * RETURN: Status
965 *
966 * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT
967 * deleted by this routine.
968 *
969 ******************************************************************************/
970
971acpi_status
972acpi_ds_obj_stack_pop_object(union acpi_operand_object **object,
973 struct acpi_walk_state *walk_state)
974{
975 ACPI_FUNCTION_NAME(ds_obj_stack_pop_object);
976
977 /* Check for stack underflow */
978
979 if (walk_state->num_operands == 0) {
980 ACPI_ERROR((AE_INFO,
981 "Missing operand/stack empty! State=%p #Ops=%X",
982 walk_state, walk_state->num_operands));
983 *object = NULL;
984 return (AE_AML_NO_OPERAND);
985 }
986
987 /* Pop the stack */
988
989 walk_state->num_operands--;
990
991 /* Check for a valid operand */
992
993 if (!walk_state->operands[walk_state->num_operands]) {
994 ACPI_ERROR((AE_INFO,
995 "Null operand! State=%p #Ops=%X",
996 walk_state, walk_state->num_operands));
997 *object = NULL;
998 return (AE_AML_NO_OPERAND);
999 }
1000
1001 /* Get operand and set stack entry to null */
1002
1003 *object = walk_state->operands[walk_state->num_operands];
1004 walk_state->operands[walk_state->num_operands] = NULL;
1005
1006 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
1007 *object, acpi_ut_get_object_type_name(*object),
1008 walk_state, walk_state->num_operands));
1009
1010 return (AE_OK);
1011}
1012
1013/*******************************************************************************
1014 *
1015 * FUNCTION: acpi_ds_obj_stack_get_value
1016 *
1017 * PARAMETERS: Index - Stack index whose value is desired. Based
1018 * on the top of the stack (index=0 == top)
1019 * walk_state - Current Walk state
1020 *
1021 * RETURN: Pointer to the requested operand
1022 *
1023 * DESCRIPTION: Retrieve an object from this walk's operand stack. Index must
1024 * be within the range of the current stack pointer.
1025 *
1026 ******************************************************************************/
1027
1028void *acpi_ds_obj_stack_get_value(u32 index, struct acpi_walk_state *walk_state)
1029{
1030
1031 ACPI_FUNCTION_TRACE_PTR(ds_obj_stack_get_value, walk_state);
1032
1033 /* Can't do it if the stack is empty */
1034
1035 if (walk_state->num_operands == 0) {
1036 return_PTR(NULL);
1037 }
1038
1039 /* or if the index is past the top of the stack */
1040
1041 if (index > (walk_state->num_operands - (u32) 1)) {
1042 return_PTR(NULL);
1043 }
1044
1045 return_PTR(walk_state->
1046 operands[(acpi_native_uint) (walk_state->num_operands - 1) -
1047 index]);
1048}
1049#endif
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