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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: nsxfname - Public interfaces to the ACPI subsystem | |
4 | * ACPI Namespace oriented interfaces | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
75a44ce0 | 9 | * Copyright (C) 2000 - 2008, Intel Corp. |
1da177e4 LT |
10 | * All rights reserved. |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions, and the following disclaimer, | |
17 | * without modification. | |
18 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
19 | * substantially similar to the "NO WARRANTY" disclaimer below | |
20 | * ("Disclaimer") and any redistribution must be conditioned upon | |
21 | * including a substantially similar Disclaimer requirement for further | |
22 | * binary redistribution. | |
23 | * 3. Neither the names of the above-listed copyright holders nor the names | |
24 | * of any contributors may be used to endorse or promote products derived | |
25 | * from this software without specific prior written permission. | |
26 | * | |
27 | * Alternatively, this software may be distributed under the terms of the | |
28 | * GNU General Public License ("GPL") version 2 as published by the Free | |
29 | * Software Foundation. | |
30 | * | |
31 | * NO WARRANTY | |
32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
35 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
36 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
40 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
41 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
42 | * POSSIBILITY OF SUCH DAMAGES. | |
43 | */ | |
44 | ||
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 LB |
46 | #include "accommon.h" |
47 | #include "acnamesp.h" | |
b2f7ddcf LM |
48 | #include "acparser.h" |
49 | #include "amlcode.h" | |
1da177e4 | 50 | |
1da177e4 | 51 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 52 | ACPI_MODULE_NAME("nsxfname") |
1da177e4 | 53 | |
15b8dd53 BM |
54 | /* Local prototypes */ |
55 | static char *acpi_ns_copy_device_id(struct acpica_device_id *dest, | |
56 | struct acpica_device_id *source, | |
57 | char *string_area); | |
58 | ||
1da177e4 LT |
59 | /****************************************************************************** |
60 | * | |
61 | * FUNCTION: acpi_get_handle | |
62 | * | |
63 | * PARAMETERS: Parent - Object to search under (search scope). | |
44f6c012 RM |
64 | * Pathname - Pointer to an asciiz string containing the |
65 | * name | |
66 | * ret_handle - Where the return handle is returned | |
1da177e4 LT |
67 | * |
68 | * RETURN: Status | |
69 | * | |
70 | * DESCRIPTION: This routine will search for a caller specified name in the | |
71 | * name space. The caller can restrict the search region by | |
72 | * specifying a non NULL parent. The parent value is itself a | |
73 | * namespace handle. | |
74 | * | |
75 | ******************************************************************************/ | |
15b8dd53 | 76 | |
1da177e4 | 77 | acpi_status |
4be44fcd LB |
78 | acpi_get_handle(acpi_handle parent, |
79 | acpi_string pathname, acpi_handle * ret_handle) | |
1da177e4 | 80 | { |
4be44fcd LB |
81 | acpi_status status; |
82 | struct acpi_namespace_node *node = NULL; | |
83 | struct acpi_namespace_node *prefix_node = NULL; | |
1da177e4 | 84 | |
4be44fcd | 85 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
86 | |
87 | /* Parameter Validation */ | |
88 | ||
89 | if (!ret_handle || !pathname) { | |
90 | return (AE_BAD_PARAMETER); | |
91 | } | |
92 | ||
93 | /* Convert a parent handle to a prefix node */ | |
94 | ||
95 | if (parent) { | |
4be44fcd | 96 | prefix_node = acpi_ns_map_handle_to_node(parent); |
1da177e4 | 97 | if (!prefix_node) { |
1da177e4 LT |
98 | return (AE_BAD_PARAMETER); |
99 | } | |
f1c2b1da BM |
100 | } |
101 | ||
102 | /* | |
103 | * Valid cases are: | |
104 | * 1) Fully qualified pathname | |
105 | * 2) Parent + Relative pathname | |
106 | * | |
107 | * Error for <null Parent + relative path> | |
108 | */ | |
109 | if (acpi_ns_valid_root_prefix(pathname[0])) { | |
1da177e4 | 110 | |
f1c2b1da BM |
111 | /* Pathname is fully qualified (starts with '\') */ |
112 | ||
113 | /* Special case for root-only, since we can't search for it */ | |
114 | ||
115 | if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) { | |
116 | *ret_handle = | |
117 | acpi_ns_convert_entry_to_handle(acpi_gbl_root_node); | |
118 | return (AE_OK); | |
1da177e4 | 119 | } |
f1c2b1da | 120 | } else if (!prefix_node) { |
1da177e4 | 121 | |
f1c2b1da | 122 | /* Relative path with null prefix is disallowed */ |
1da177e4 | 123 | |
f1c2b1da | 124 | return (AE_BAD_PARAMETER); |
1da177e4 LT |
125 | } |
126 | ||
f1c2b1da | 127 | /* Find the Node and convert to a handle */ |
1da177e4 | 128 | |
f1c2b1da BM |
129 | status = |
130 | acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node); | |
4be44fcd LB |
131 | if (ACPI_SUCCESS(status)) { |
132 | *ret_handle = acpi_ns_convert_entry_to_handle(node); | |
1da177e4 LT |
133 | } |
134 | ||
135 | return (status); | |
136 | } | |
1da177e4 | 137 | |
8313524a | 138 | ACPI_EXPORT_SYMBOL(acpi_get_handle) |
1da177e4 LT |
139 | |
140 | /****************************************************************************** | |
141 | * | |
142 | * FUNCTION: acpi_get_name | |
143 | * | |
144 | * PARAMETERS: Handle - Handle to be converted to a pathname | |
145 | * name_type - Full pathname or single segment | |
146 | * Buffer - Buffer for returned path | |
147 | * | |
148 | * RETURN: Pointer to a string containing the fully qualified Name. | |
149 | * | |
150 | * DESCRIPTION: This routine returns the fully qualified name associated with | |
151 | * the Handle parameter. This and the acpi_pathname_to_handle are | |
152 | * complementary functions. | |
153 | * | |
154 | ******************************************************************************/ | |
1da177e4 | 155 | acpi_status |
4be44fcd | 156 | acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer) |
1da177e4 | 157 | { |
4be44fcd LB |
158 | acpi_status status; |
159 | struct acpi_namespace_node *node; | |
1da177e4 LT |
160 | |
161 | /* Parameter validation */ | |
162 | ||
163 | if (name_type > ACPI_NAME_TYPE_MAX) { | |
164 | return (AE_BAD_PARAMETER); | |
165 | } | |
166 | ||
4be44fcd LB |
167 | status = acpi_ut_validate_buffer(buffer); |
168 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
169 | return (status); |
170 | } | |
171 | ||
172 | if (name_type == ACPI_FULL_PATHNAME) { | |
52fc0b02 | 173 | |
1da177e4 LT |
174 | /* Get the full pathname (From the namespace root) */ |
175 | ||
4be44fcd | 176 | status = acpi_ns_handle_to_pathname(handle, buffer); |
1da177e4 LT |
177 | return (status); |
178 | } | |
179 | ||
180 | /* | |
181 | * Wants the single segment ACPI name. | |
182 | * Validate handle and convert to a namespace Node | |
183 | */ | |
4be44fcd LB |
184 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
185 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
186 | return (status); |
187 | } | |
188 | ||
4be44fcd | 189 | node = acpi_ns_map_handle_to_node(handle); |
1da177e4 LT |
190 | if (!node) { |
191 | status = AE_BAD_PARAMETER; | |
192 | goto unlock_and_exit; | |
193 | } | |
194 | ||
195 | /* Validate/Allocate/Clear caller buffer */ | |
196 | ||
4be44fcd LB |
197 | status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH); |
198 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
199 | goto unlock_and_exit; |
200 | } | |
201 | ||
202 | /* Just copy the ACPI name from the Node and zero terminate it */ | |
203 | ||
4be44fcd LB |
204 | ACPI_STRNCPY(buffer->pointer, acpi_ut_get_node_name(node), |
205 | ACPI_NAME_SIZE); | |
206 | ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0; | |
1da177e4 LT |
207 | status = AE_OK; |
208 | ||
4be44fcd | 209 | unlock_and_exit: |
1da177e4 | 210 | |
4be44fcd | 211 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 LT |
212 | return (status); |
213 | } | |
1da177e4 | 214 | |
8313524a | 215 | ACPI_EXPORT_SYMBOL(acpi_get_name) |
1da177e4 | 216 | |
15b8dd53 BM |
217 | /****************************************************************************** |
218 | * | |
219 | * FUNCTION: acpi_ns_copy_device_id | |
220 | * | |
221 | * PARAMETERS: Dest - Pointer to the destination DEVICE_ID | |
222 | * Source - Pointer to the source DEVICE_ID | |
223 | * string_area - Pointer to where to copy the dest string | |
224 | * | |
225 | * RETURN: Pointer to the next string area | |
226 | * | |
227 | * DESCRIPTION: Copy a single DEVICE_ID, including the string data. | |
228 | * | |
229 | ******************************************************************************/ | |
230 | static char *acpi_ns_copy_device_id(struct acpica_device_id *dest, | |
231 | struct acpica_device_id *source, | |
232 | char *string_area) | |
233 | { | |
234 | /* Create the destination DEVICE_ID */ | |
235 | ||
236 | dest->string = string_area; | |
237 | dest->length = source->length; | |
238 | ||
239 | /* Copy actual string and return a pointer to the next string area */ | |
240 | ||
241 | ACPI_MEMCPY(string_area, source->string, source->length); | |
242 | return (string_area + source->length); | |
243 | } | |
244 | ||
1da177e4 LT |
245 | /****************************************************************************** |
246 | * | |
247 | * FUNCTION: acpi_get_object_info | |
248 | * | |
15b8dd53 BM |
249 | * PARAMETERS: Handle - Object Handle |
250 | * return_buffer - Where the info is returned | |
1da177e4 LT |
251 | * |
252 | * RETURN: Status | |
253 | * | |
254 | * DESCRIPTION: Returns information about an object as gleaned from the | |
255 | * namespace node and possibly by running several standard | |
256 | * control methods (Such as in the case of a device.) | |
257 | * | |
15b8dd53 BM |
258 | * For Device and Processor objects, run the Device _HID, _UID, _CID, _STA, |
259 | * _ADR, _sx_w, and _sx_d methods. | |
260 | * | |
261 | * Note: Allocates the return buffer, must be freed by the caller. | |
262 | * | |
1da177e4 | 263 | ******************************************************************************/ |
15b8dd53 | 264 | |
1da177e4 | 265 | acpi_status |
15b8dd53 BM |
266 | acpi_get_object_info(acpi_handle handle, |
267 | struct acpi_device_info **return_buffer) | |
1da177e4 | 268 | { |
4be44fcd LB |
269 | struct acpi_namespace_node *node; |
270 | struct acpi_device_info *info; | |
15b8dd53 BM |
271 | struct acpica_device_id_list *cid_list = NULL; |
272 | struct acpica_device_id *hid = NULL; | |
273 | struct acpica_device_id *uid = NULL; | |
274 | char *next_id_string; | |
275 | acpi_object_type type; | |
276 | acpi_name name; | |
277 | u8 param_count = 0; | |
278 | u8 valid = 0; | |
279 | u32 info_size; | |
280 | u32 i; | |
281 | acpi_status status; | |
1da177e4 LT |
282 | |
283 | /* Parameter validation */ | |
284 | ||
15b8dd53 | 285 | if (!handle || !return_buffer) { |
1da177e4 LT |
286 | return (AE_BAD_PARAMETER); |
287 | } | |
288 | ||
4be44fcd LB |
289 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
290 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
291 | goto cleanup; |
292 | } | |
293 | ||
4be44fcd | 294 | node = acpi_ns_map_handle_to_node(handle); |
1da177e4 | 295 | if (!node) { |
4be44fcd | 296 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
15b8dd53 | 297 | return (AE_BAD_PARAMETER); |
1da177e4 LT |
298 | } |
299 | ||
15b8dd53 | 300 | /* Get the namespace node data while the namespace is locked */ |
1da177e4 | 301 | |
15b8dd53 BM |
302 | info_size = sizeof(struct acpi_device_info); |
303 | type = node->type; | |
304 | name = node->name.integer; | |
1da177e4 | 305 | |
0a1fbf2d | 306 | if (node->type == ACPI_TYPE_METHOD) { |
15b8dd53 | 307 | param_count = node->object->method.param_count; |
0a1fbf2d BM |
308 | } |
309 | ||
4be44fcd LB |
310 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
311 | if (ACPI_FAILURE(status)) { | |
15b8dd53 | 312 | return (status); |
1da177e4 LT |
313 | } |
314 | ||
15b8dd53 | 315 | if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) { |
1da177e4 | 316 | /* |
15b8dd53 BM |
317 | * Get extra info for ACPI Device/Processor objects only: |
318 | * Run the Device _HID, _UID, and _CID methods. | |
1da177e4 LT |
319 | * |
320 | * Note: none of these methods are required, so they may or may | |
15b8dd53 BM |
321 | * not be present for this device. The Info->Valid bitfield is used |
322 | * to indicate which methods were found and run successfully. | |
1da177e4 LT |
323 | */ |
324 | ||
325 | /* Execute the Device._HID method */ | |
326 | ||
15b8dd53 | 327 | status = acpi_ut_execute_HID(node, &hid); |
4be44fcd | 328 | if (ACPI_SUCCESS(status)) { |
15b8dd53 BM |
329 | info_size += hid->length; |
330 | valid |= ACPI_VALID_HID; | |
1da177e4 LT |
331 | } |
332 | ||
333 | /* Execute the Device._UID method */ | |
334 | ||
15b8dd53 | 335 | status = acpi_ut_execute_UID(node, &uid); |
4be44fcd | 336 | if (ACPI_SUCCESS(status)) { |
15b8dd53 BM |
337 | info_size += uid->length; |
338 | valid |= ACPI_VALID_UID; | |
1da177e4 LT |
339 | } |
340 | ||
341 | /* Execute the Device._CID method */ | |
342 | ||
4be44fcd LB |
343 | status = acpi_ut_execute_CID(node, &cid_list); |
344 | if (ACPI_SUCCESS(status)) { | |
15b8dd53 BM |
345 | |
346 | /* Add size of CID strings and CID pointer array */ | |
347 | ||
348 | info_size += | |
349 | (cid_list->list_size - | |
350 | sizeof(struct acpica_device_id_list)); | |
351 | valid |= ACPI_VALID_CID; | |
1da177e4 | 352 | } |
15b8dd53 BM |
353 | } |
354 | ||
355 | /* | |
356 | * Now that we have the variable-length data, we can allocate the | |
357 | * return buffer | |
358 | */ | |
359 | info = ACPI_ALLOCATE_ZEROED(info_size); | |
360 | if (!info) { | |
361 | status = AE_NO_MEMORY; | |
362 | goto cleanup; | |
363 | } | |
364 | ||
365 | /* Get the fixed-length data */ | |
366 | ||
367 | if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) { | |
368 | /* | |
369 | * Get extra info for ACPI Device/Processor objects only: | |
370 | * Run the _STA, _ADR and, sx_w, and _sx_d methods. | |
371 | * | |
372 | * Note: none of these methods are required, so they may or may | |
373 | * not be present for this device. The Info->Valid bitfield is used | |
374 | * to indicate which methods were found and run successfully. | |
375 | */ | |
1da177e4 LT |
376 | |
377 | /* Execute the Device._STA method */ | |
378 | ||
4be44fcd LB |
379 | status = acpi_ut_execute_STA(node, &info->current_status); |
380 | if (ACPI_SUCCESS(status)) { | |
15b8dd53 | 381 | valid |= ACPI_VALID_STA; |
1da177e4 LT |
382 | } |
383 | ||
384 | /* Execute the Device._ADR method */ | |
385 | ||
4be44fcd LB |
386 | status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node, |
387 | &info->address); | |
388 | if (ACPI_SUCCESS(status)) { | |
15b8dd53 BM |
389 | valid |= ACPI_VALID_ADR; |
390 | } | |
391 | ||
392 | /* Execute the Device._sx_w methods */ | |
393 | ||
394 | status = acpi_ut_execute_power_methods(node, | |
395 | acpi_gbl_lowest_dstate_names, | |
396 | ACPI_NUM_sx_w_METHODS, | |
397 | info->lowest_dstates); | |
398 | if (ACPI_SUCCESS(status)) { | |
399 | valid |= ACPI_VALID_SXWS; | |
1da177e4 LT |
400 | } |
401 | ||
402 | /* Execute the Device._sx_d methods */ | |
403 | ||
15b8dd53 BM |
404 | status = acpi_ut_execute_power_methods(node, |
405 | acpi_gbl_highest_dstate_names, | |
406 | ACPI_NUM_sx_d_METHODS, | |
407 | info->highest_dstates); | |
4be44fcd | 408 | if (ACPI_SUCCESS(status)) { |
15b8dd53 | 409 | valid |= ACPI_VALID_SXDS; |
1da177e4 LT |
410 | } |
411 | } | |
412 | ||
15b8dd53 BM |
413 | /* |
414 | * Create a pointer to the string area of the return buffer. | |
415 | * Point to the end of the base struct acpi_device_info structure. | |
416 | */ | |
417 | next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids); | |
418 | if (cid_list) { | |
1da177e4 | 419 | |
15b8dd53 BM |
420 | /* Point past the CID DEVICE_ID array */ |
421 | ||
422 | next_id_string += | |
423 | ((acpi_size) cid_list->count * | |
424 | sizeof(struct acpica_device_id)); | |
1da177e4 LT |
425 | } |
426 | ||
15b8dd53 BM |
427 | /* |
428 | * Copy the HID, UID, and CIDs to the return buffer. The variable-length | |
429 | * strings are copied to the reserved area at the end of the buffer. | |
430 | * | |
431 | * For HID and CID, check if the ID is a PCI Root Bridge. | |
432 | */ | |
433 | if (hid) { | |
434 | next_id_string = acpi_ns_copy_device_id(&info->hardware_id, | |
435 | hid, next_id_string); | |
436 | ||
437 | if (acpi_ut_is_pci_root_bridge(hid->string)) { | |
438 | info->flags |= ACPI_PCI_ROOT_BRIDGE; | |
439 | } | |
440 | } | |
1da177e4 | 441 | |
15b8dd53 BM |
442 | if (uid) { |
443 | next_id_string = acpi_ns_copy_device_id(&info->unique_id, | |
444 | uid, next_id_string); | |
445 | } | |
1da177e4 LT |
446 | |
447 | if (cid_list) { | |
15b8dd53 BM |
448 | info->compatible_id_list.count = cid_list->count; |
449 | info->compatible_id_list.list_size = cid_list->list_size; | |
450 | ||
451 | /* Copy each CID */ | |
452 | ||
453 | for (i = 0; i < cid_list->count; i++) { | |
454 | next_id_string = | |
455 | acpi_ns_copy_device_id(&info->compatible_id_list. | |
456 | ids[i], &cid_list->ids[i], | |
457 | next_id_string); | |
458 | ||
459 | if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) { | |
460 | info->flags |= ACPI_PCI_ROOT_BRIDGE; | |
461 | } | |
462 | } | |
1da177e4 LT |
463 | } |
464 | ||
15b8dd53 BM |
465 | /* Copy the fixed-length data */ |
466 | ||
467 | info->info_size = info_size; | |
468 | info->type = type; | |
469 | info->name = name; | |
470 | info->param_count = param_count; | |
471 | info->valid = valid; | |
472 | ||
473 | *return_buffer = info; | |
474 | status = AE_OK; | |
475 | ||
4be44fcd | 476 | cleanup: |
15b8dd53 BM |
477 | if (hid) { |
478 | ACPI_FREE(hid); | |
479 | } | |
480 | if (uid) { | |
481 | ACPI_FREE(uid); | |
482 | } | |
1da177e4 | 483 | if (cid_list) { |
8313524a | 484 | ACPI_FREE(cid_list); |
1da177e4 LT |
485 | } |
486 | return (status); | |
487 | } | |
1da177e4 | 488 | |
8313524a | 489 | ACPI_EXPORT_SYMBOL(acpi_get_object_info) |
b2f7ddcf LM |
490 | |
491 | /****************************************************************************** | |
492 | * | |
493 | * FUNCTION: acpi_install_method | |
494 | * | |
495 | * PARAMETERS: Buffer - An ACPI table containing one control method | |
496 | * | |
497 | * RETURN: Status | |
498 | * | |
499 | * DESCRIPTION: Install a control method into the namespace. If the method | |
500 | * name already exists in the namespace, it is overwritten. The | |
501 | * input buffer must contain a valid DSDT or SSDT containing a | |
502 | * single control method. | |
503 | * | |
504 | ******************************************************************************/ | |
505 | acpi_status acpi_install_method(u8 *buffer) | |
506 | { | |
507 | struct acpi_table_header *table = | |
508 | ACPI_CAST_PTR(struct acpi_table_header, buffer); | |
509 | u8 *aml_buffer; | |
510 | u8 *aml_start; | |
511 | char *path; | |
512 | struct acpi_namespace_node *node; | |
513 | union acpi_operand_object *method_obj; | |
514 | struct acpi_parse_state parser_state; | |
515 | u32 aml_length; | |
516 | u16 opcode; | |
517 | u8 method_flags; | |
518 | acpi_status status; | |
519 | ||
520 | /* Parameter validation */ | |
521 | ||
522 | if (!buffer) { | |
523 | return AE_BAD_PARAMETER; | |
524 | } | |
525 | ||
526 | /* Table must be a DSDT or SSDT */ | |
527 | ||
528 | if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) && | |
529 | !ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) { | |
530 | return AE_BAD_HEADER; | |
531 | } | |
532 | ||
533 | /* First AML opcode in the table must be a control method */ | |
534 | ||
535 | parser_state.aml = buffer + sizeof(struct acpi_table_header); | |
536 | opcode = acpi_ps_peek_opcode(&parser_state); | |
537 | if (opcode != AML_METHOD_OP) { | |
538 | return AE_BAD_PARAMETER; | |
539 | } | |
540 | ||
541 | /* Extract method information from the raw AML */ | |
542 | ||
543 | parser_state.aml += acpi_ps_get_opcode_size(opcode); | |
544 | parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state); | |
545 | path = acpi_ps_get_next_namestring(&parser_state); | |
546 | method_flags = *parser_state.aml++; | |
547 | aml_start = parser_state.aml; | |
548 | aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start); | |
549 | ||
550 | /* | |
551 | * Allocate resources up-front. We don't want to have to delete a new | |
552 | * node from the namespace if we cannot allocate memory. | |
553 | */ | |
554 | aml_buffer = ACPI_ALLOCATE(aml_length); | |
555 | if (!aml_buffer) { | |
556 | return AE_NO_MEMORY; | |
557 | } | |
558 | ||
559 | method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD); | |
560 | if (!method_obj) { | |
561 | ACPI_FREE(aml_buffer); | |
562 | return AE_NO_MEMORY; | |
563 | } | |
564 | ||
565 | /* Lock namespace for acpi_ns_lookup, we may be creating a new node */ | |
566 | ||
567 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); | |
568 | if (ACPI_FAILURE(status)) { | |
569 | goto error_exit; | |
570 | } | |
571 | ||
572 | /* The lookup either returns an existing node or creates a new one */ | |
573 | ||
574 | status = | |
575 | acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1, | |
576 | ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND, | |
577 | NULL, &node); | |
578 | ||
579 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
580 | ||
581 | if (ACPI_FAILURE(status)) { /* ns_lookup */ | |
582 | if (status != AE_ALREADY_EXISTS) { | |
583 | goto error_exit; | |
584 | } | |
585 | ||
586 | /* Node existed previously, make sure it is a method node */ | |
587 | ||
588 | if (node->type != ACPI_TYPE_METHOD) { | |
589 | status = AE_TYPE; | |
590 | goto error_exit; | |
591 | } | |
592 | } | |
593 | ||
594 | /* Copy the method AML to the local buffer */ | |
595 | ||
596 | ACPI_MEMCPY(aml_buffer, aml_start, aml_length); | |
597 | ||
598 | /* Initialize the method object with the new method's information */ | |
599 | ||
600 | method_obj->method.aml_start = aml_buffer; | |
601 | method_obj->method.aml_length = aml_length; | |
602 | ||
603 | method_obj->method.param_count = (u8) | |
604 | (method_flags & AML_METHOD_ARG_COUNT); | |
605 | ||
606 | method_obj->method.method_flags = (u8) | |
607 | (method_flags & ~AML_METHOD_ARG_COUNT); | |
608 | ||
609 | if (method_flags & AML_METHOD_SERIALIZED) { | |
610 | method_obj->method.sync_level = (u8) | |
611 | ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4); | |
612 | } | |
613 | ||
614 | /* | |
615 | * Now that it is complete, we can attach the new method object to | |
616 | * the method Node (detaches/deletes any existing object) | |
617 | */ | |
618 | status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD); | |
619 | ||
620 | /* | |
621 | * Flag indicates AML buffer is dynamic, must be deleted later. | |
622 | * Must be set only after attach above. | |
623 | */ | |
624 | node->flags |= ANOBJ_ALLOCATED_BUFFER; | |
625 | ||
626 | /* Remove local reference to the method object */ | |
627 | ||
628 | acpi_ut_remove_reference(method_obj); | |
629 | return status; | |
630 | ||
631 | error_exit: | |
632 | ||
633 | ACPI_FREE(aml_buffer); | |
634 | ACPI_FREE(method_obj); | |
635 | return status; | |
636 | } | |
637 | ACPI_EXPORT_SYMBOL(acpi_install_method) |