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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
d59b8ecd | 3 | * Module Name: tbxface - ACPI table oriented external interfaces |
1da177e4 LT |
4 | * |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
77848130 | 8 | * Copyright (C) 2000 - 2012, Intel Corp. |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
214f2c90 | 44 | #include <linux/export.h> |
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 LB |
46 | #include "accommon.h" |
47 | #include "acnamesp.h" | |
48 | #include "actables.h" | |
1da177e4 | 49 | |
1da177e4 | 50 | #define _COMPONENT ACPI_TABLES |
4be44fcd | 51 | ACPI_MODULE_NAME("tbxface") |
1da177e4 | 52 | |
77389e12 BM |
53 | /******************************************************************************* |
54 | * | |
55 | * FUNCTION: acpi_allocate_root_table | |
56 | * | |
57 | * PARAMETERS: initial_table_count - Size of initial_table_array, in number of | |
58 | * struct acpi_table_desc structures | |
59 | * | |
60 | * RETURN: Status | |
61 | * | |
ba494bee | 62 | * DESCRIPTION: Allocate a root table array. Used by iASL compiler and |
77389e12 BM |
63 | * acpi_initialize_tables. |
64 | * | |
65 | ******************************************************************************/ | |
77389e12 BM |
66 | acpi_status acpi_allocate_root_table(u32 initial_table_count) |
67 | { | |
68 | ||
b9ee2043 | 69 | acpi_gbl_root_table_list.max_table_count = initial_table_count; |
77389e12 BM |
70 | acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE; |
71 | ||
72 | return (acpi_tb_resize_root_table_list()); | |
73 | } | |
74 | ||
1da177e4 LT |
75 | /******************************************************************************* |
76 | * | |
f3d2e786 | 77 | * FUNCTION: acpi_initialize_tables |
1da177e4 | 78 | * |
f3d2e786 BM |
79 | * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated |
80 | * struct acpi_table_desc structures. If NULL, the | |
81 | * array is dynamically allocated. | |
82 | * initial_table_count - Size of initial_table_array, in number of | |
83 | * struct acpi_table_desc structures | |
84 | * allow_realloc - Flag to tell Table Manager if resize of | |
85 | * pre-allocated array is allowed. Ignored | |
86 | * if initial_table_array is NULL. | |
1da177e4 LT |
87 | * |
88 | * RETURN: Status | |
89 | * | |
f3d2e786 BM |
90 | * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT. |
91 | * | |
92 | * NOTE: Allows static allocation of the initial table array in order | |
93 | * to avoid the use of dynamic memory in confined environments | |
94 | * such as the kernel boot sequence where it may not be available. | |
95 | * | |
96 | * If the host OS memory managers are initialized, use NULL for | |
97 | * initial_table_array, and the table will be dynamically allocated. | |
1da177e4 LT |
98 | * |
99 | ******************************************************************************/ | |
f3d2e786 | 100 | |
ad71860a | 101 | acpi_status __init |
77389e12 | 102 | acpi_initialize_tables(struct acpi_table_desc * initial_table_array, |
f3d2e786 | 103 | u32 initial_table_count, u8 allow_resize) |
1da177e4 | 104 | { |
c5fc42ac | 105 | acpi_physical_address rsdp_address; |
4be44fcd | 106 | acpi_status status; |
1da177e4 | 107 | |
f3d2e786 | 108 | ACPI_FUNCTION_TRACE(acpi_initialize_tables); |
1da177e4 | 109 | |
f3d2e786 BM |
110 | /* |
111 | * Set up the Root Table Array | |
112 | * Allocate the table array if requested | |
113 | */ | |
114 | if (!initial_table_array) { | |
77389e12 | 115 | status = acpi_allocate_root_table(initial_table_count); |
f3d2e786 BM |
116 | if (ACPI_FAILURE(status)) { |
117 | return_ACPI_STATUS(status); | |
118 | } | |
119 | } else { | |
120 | /* Root Table Array has been statically allocated by the host */ | |
121 | ||
a4bbb810 | 122 | ACPI_MEMSET(initial_table_array, 0, |
67a119f9 | 123 | (acpi_size) initial_table_count * |
a4bbb810 | 124 | sizeof(struct acpi_table_desc)); |
c5fc42ac | 125 | |
f3d2e786 | 126 | acpi_gbl_root_table_list.tables = initial_table_array; |
b9ee2043 | 127 | acpi_gbl_root_table_list.max_table_count = initial_table_count; |
c5fc42ac | 128 | acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN; |
f3d2e786 | 129 | if (allow_resize) { |
c5fc42ac BM |
130 | acpi_gbl_root_table_list.flags |= |
131 | ACPI_ROOT_ALLOW_RESIZE; | |
f3d2e786 | 132 | } |
1da177e4 LT |
133 | } |
134 | ||
c5fc42ac | 135 | /* Get the address of the RSDP */ |
1da177e4 | 136 | |
c5fc42ac BM |
137 | rsdp_address = acpi_os_get_root_pointer(); |
138 | if (!rsdp_address) { | |
f3d2e786 BM |
139 | return_ACPI_STATUS(AE_NOT_FOUND); |
140 | } | |
1da177e4 | 141 | |
f3d2e786 BM |
142 | /* |
143 | * Get the root table (RSDT or XSDT) and extract all entries to the local | |
144 | * Root Table Array. This array contains the information of the RSDT/XSDT | |
145 | * in a common, more useable format. | |
146 | */ | |
97cbb7d1 | 147 | status = acpi_tb_parse_root_table(rsdp_address); |
f3d2e786 BM |
148 | return_ACPI_STATUS(status); |
149 | } | |
1da177e4 | 150 | |
f3d2e786 BM |
151 | /******************************************************************************* |
152 | * | |
153 | * FUNCTION: acpi_reallocate_root_table | |
154 | * | |
155 | * PARAMETERS: None | |
156 | * | |
157 | * RETURN: Status | |
158 | * | |
159 | * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the | |
160 | * root list from the previously provided scratch area. Should | |
161 | * be called once dynamic memory allocation is available in the | |
162 | * kernel | |
163 | * | |
164 | ******************************************************************************/ | |
165 | acpi_status acpi_reallocate_root_table(void) | |
166 | { | |
167 | struct acpi_table_desc *tables; | |
168 | acpi_size new_size; | |
333b04ae | 169 | acpi_size current_size; |
f3d2e786 BM |
170 | |
171 | ACPI_FUNCTION_TRACE(acpi_reallocate_root_table); | |
172 | ||
173 | /* | |
174 | * Only reallocate the root table if the host provided a static buffer | |
175 | * for the table array in the call to acpi_initialize_tables. | |
176 | */ | |
c5fc42ac | 177 | if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) { |
f3d2e786 | 178 | return_ACPI_STATUS(AE_SUPPORT); |
1da177e4 LT |
179 | } |
180 | ||
333b04ae AS |
181 | /* |
182 | * Get the current size of the root table and add the default | |
183 | * increment to create the new table size. | |
184 | */ | |
185 | current_size = (acpi_size) | |
b9ee2043 BM |
186 | acpi_gbl_root_table_list.current_table_count * |
187 | sizeof(struct acpi_table_desc); | |
333b04ae AS |
188 | |
189 | new_size = current_size + | |
190 | (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc)); | |
1da177e4 | 191 | |
f3d2e786 | 192 | /* Create new array and copy the old array */ |
1da177e4 | 193 | |
f3d2e786 BM |
194 | tables = ACPI_ALLOCATE_ZEROED(new_size); |
195 | if (!tables) { | |
196 | return_ACPI_STATUS(AE_NO_MEMORY); | |
1da177e4 LT |
197 | } |
198 | ||
333b04ae | 199 | ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size); |
1da177e4 | 200 | |
333b04ae AS |
201 | /* |
202 | * Update the root table descriptor. The new size will be the current | |
203 | * number of tables plus the increment, independent of the reserved | |
204 | * size of the original table list. | |
205 | */ | |
f3d2e786 | 206 | acpi_gbl_root_table_list.tables = tables; |
b9ee2043 BM |
207 | acpi_gbl_root_table_list.max_table_count = |
208 | acpi_gbl_root_table_list.current_table_count + | |
209 | ACPI_ROOT_TABLE_SIZE_INCREMENT; | |
f3d2e786 | 210 | acpi_gbl_root_table_list.flags = |
c5fc42ac | 211 | ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE; |
8313524a | 212 | |
f3d2e786 BM |
213 | return_ACPI_STATUS(AE_OK); |
214 | } | |
fd350943 | 215 | |
ec41f193 | 216 | /******************************************************************************* |
f3d2e786 BM |
217 | * |
218 | * FUNCTION: acpi_get_table_header | |
219 | * | |
ba494bee BM |
220 | * PARAMETERS: signature - ACPI signature of needed table |
221 | * instance - Which instance (for SSDTs) | |
428f2112 | 222 | * out_table_header - The pointer to the table header to fill |
f3d2e786 BM |
223 | * |
224 | * RETURN: Status and pointer to mapped table header | |
225 | * | |
226 | * DESCRIPTION: Finds an ACPI table header. | |
227 | * | |
228 | * NOTE: Caller is responsible in unmapping the header with | |
229 | * acpi_os_unmap_memory | |
230 | * | |
ec41f193 | 231 | ******************************************************************************/ |
f3d2e786 BM |
232 | acpi_status |
233 | acpi_get_table_header(char *signature, | |
67a119f9 | 234 | u32 instance, struct acpi_table_header *out_table_header) |
f3d2e786 | 235 | { |
67a119f9 BM |
236 | u32 i; |
237 | u32 j; | |
428f2112 | 238 | struct acpi_table_header *header; |
0c9938cc | 239 | |
c5fc42ac BM |
240 | /* Parameter validation */ |
241 | ||
242 | if (!signature || !out_table_header) { | |
243 | return (AE_BAD_PARAMETER); | |
244 | } | |
245 | ||
ec41f193 BM |
246 | /* Walk the root table list */ |
247 | ||
b9ee2043 BM |
248 | for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count; |
249 | i++) { | |
f3d2e786 BM |
250 | if (!ACPI_COMPARE_NAME |
251 | (&(acpi_gbl_root_table_list.tables[i].signature), | |
252 | signature)) { | |
253 | continue; | |
0c9938cc RM |
254 | } |
255 | ||
f3d2e786 BM |
256 | if (++j < instance) { |
257 | continue; | |
258 | } | |
1da177e4 | 259 | |
428f2112 | 260 | if (!acpi_gbl_root_table_list.tables[i].pointer) { |
ec41f193 BM |
261 | if ((acpi_gbl_root_table_list.tables[i].flags & |
262 | ACPI_TABLE_ORIGIN_MASK) == | |
428f2112 AS |
263 | ACPI_TABLE_ORIGIN_MAPPED) { |
264 | header = | |
265 | acpi_os_map_memory(acpi_gbl_root_table_list. | |
266 | tables[i].address, | |
267 | sizeof(struct | |
268 | acpi_table_header)); | |
269 | if (!header) { | |
270 | return AE_NO_MEMORY; | |
271 | } | |
272 | ACPI_MEMCPY(out_table_header, header, | |
273 | sizeof(struct acpi_table_header)); | |
274 | acpi_os_unmap_memory(header, | |
275 | sizeof(struct | |
276 | acpi_table_header)); | |
277 | } else { | |
278 | return AE_NOT_FOUND; | |
279 | } | |
280 | } else { | |
281 | ACPI_MEMCPY(out_table_header, | |
282 | acpi_gbl_root_table_list.tables[i].pointer, | |
283 | sizeof(struct acpi_table_header)); | |
f3d2e786 | 284 | } |
f3d2e786 | 285 | return (AE_OK); |
1da177e4 LT |
286 | } |
287 | ||
f3d2e786 | 288 | return (AE_NOT_FOUND); |
1da177e4 LT |
289 | } |
290 | ||
f3d2e786 | 291 | ACPI_EXPORT_SYMBOL(acpi_get_table_header) |
8313524a | 292 | |
ec41f193 | 293 | /******************************************************************************* |
0f0fe1a0 JK |
294 | * |
295 | * FUNCTION: acpi_unload_table_id | |
296 | * | |
f3d2e786 | 297 | * PARAMETERS: id - Owner ID of the table to be removed. |
0f0fe1a0 JK |
298 | * |
299 | * RETURN: Status | |
300 | * | |
301 | * DESCRIPTION: This routine is used to force the unload of a table (by id) | |
302 | * | |
303 | ******************************************************************************/ | |
f3d2e786 | 304 | acpi_status acpi_unload_table_id(acpi_owner_id id) |
0f0fe1a0 | 305 | { |
f3d2e786 BM |
306 | int i; |
307 | acpi_status status = AE_NOT_EXIST; | |
0f0fe1a0 | 308 | |
ecb5f752 | 309 | ACPI_FUNCTION_TRACE(acpi_unload_table_id); |
0f0fe1a0 | 310 | |
ecb5f752 | 311 | /* Find table in the global table list */ |
b9ee2043 | 312 | for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { |
f3d2e786 BM |
313 | if (id != acpi_gbl_root_table_list.tables[i].owner_id) { |
314 | continue; | |
315 | } | |
316 | /* | |
fd350943 LB |
317 | * Delete all namespace objects owned by this table. Note that these |
318 | * objects can appear anywhere in the namespace by virtue of the AML | |
319 | * "Scope" operator. Thus, we need to track ownership by an ID, not | |
320 | * simply a position within the hierarchy | |
321 | */ | |
f3d2e786 | 322 | acpi_tb_delete_namespace_by_owner(i); |
ecb5f752 | 323 | status = acpi_tb_release_owner_id(i); |
f3d2e786 | 324 | acpi_tb_set_table_loaded_flag(i, FALSE); |
ecb5f752 | 325 | break; |
f3d2e786 BM |
326 | } |
327 | return_ACPI_STATUS(status); | |
0f0fe1a0 JK |
328 | } |
329 | ||
330 | ACPI_EXPORT_SYMBOL(acpi_unload_table_id) | |
331 | ||
1da177e4 LT |
332 | /******************************************************************************* |
333 | * | |
7d97277b | 334 | * FUNCTION: acpi_get_table_with_size |
1da177e4 | 335 | * |
ba494bee BM |
336 | * PARAMETERS: signature - ACPI signature of needed table |
337 | * instance - Which instance (for SSDTs) | |
f3d2e786 | 338 | * out_table - Where the pointer to the table is returned |
1da177e4 | 339 | * |
f3d2e786 | 340 | * RETURN: Status and pointer to table |
1da177e4 | 341 | * |
f3d2e786 | 342 | * DESCRIPTION: Finds and verifies an ACPI table. |
1da177e4 | 343 | * |
ec41f193 | 344 | ******************************************************************************/ |
f3d2e786 | 345 | acpi_status |
7d97277b YL |
346 | acpi_get_table_with_size(char *signature, |
347 | u32 instance, struct acpi_table_header **out_table, | |
348 | acpi_size *tbl_size) | |
1da177e4 | 349 | { |
67a119f9 BM |
350 | u32 i; |
351 | u32 j; | |
f3d2e786 | 352 | acpi_status status; |
1da177e4 | 353 | |
c5fc42ac BM |
354 | /* Parameter validation */ |
355 | ||
356 | if (!signature || !out_table) { | |
357 | return (AE_BAD_PARAMETER); | |
358 | } | |
359 | ||
ec41f193 BM |
360 | /* Walk the root table list */ |
361 | ||
b9ee2043 BM |
362 | for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count; |
363 | i++) { | |
f3d2e786 BM |
364 | if (!ACPI_COMPARE_NAME |
365 | (&(acpi_gbl_root_table_list.tables[i].signature), | |
366 | signature)) { | |
367 | continue; | |
368 | } | |
1da177e4 | 369 | |
f3d2e786 BM |
370 | if (++j < instance) { |
371 | continue; | |
372 | } | |
1da177e4 | 373 | |
f3d2e786 BM |
374 | status = |
375 | acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]); | |
376 | if (ACPI_SUCCESS(status)) { | |
377 | *out_table = acpi_gbl_root_table_list.tables[i].pointer; | |
7d97277b | 378 | *tbl_size = acpi_gbl_root_table_list.tables[i].length; |
f3d2e786 | 379 | } |
f6dd9221 | 380 | |
ad71860a | 381 | if (!acpi_gbl_permanent_mmap) { |
70c0846e | 382 | acpi_gbl_root_table_list.tables[i].pointer = NULL; |
ad71860a AS |
383 | } |
384 | ||
f3d2e786 | 385 | return (status); |
1da177e4 LT |
386 | } |
387 | ||
f3d2e786 | 388 | return (AE_NOT_FOUND); |
1da177e4 | 389 | } |
4f81f986 | 390 | ACPI_EXPORT_SYMBOL(acpi_get_table_with_size) |
1da177e4 | 391 | |
7d97277b YL |
392 | acpi_status |
393 | acpi_get_table(char *signature, | |
394 | u32 instance, struct acpi_table_header **out_table) | |
395 | { | |
396 | acpi_size tbl_size; | |
397 | ||
398 | return acpi_get_table_with_size(signature, | |
399 | instance, out_table, &tbl_size); | |
400 | } | |
f3d2e786 | 401 | ACPI_EXPORT_SYMBOL(acpi_get_table) |
8313524a | 402 | |
1da177e4 LT |
403 | /******************************************************************************* |
404 | * | |
f3d2e786 | 405 | * FUNCTION: acpi_get_table_by_index |
1da177e4 | 406 | * |
f3d2e786 | 407 | * PARAMETERS: table_index - Table index |
ba494bee | 408 | * table - Where the pointer to the table is returned |
1da177e4 | 409 | * |
f3d2e786 | 410 | * RETURN: Status and pointer to the table |
1da177e4 | 411 | * |
f3d2e786 | 412 | * DESCRIPTION: Obtain a table by an index into the global table list. |
1da177e4 LT |
413 | * |
414 | ******************************************************************************/ | |
1da177e4 | 415 | acpi_status |
67a119f9 | 416 | acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table) |
1da177e4 | 417 | { |
4be44fcd | 418 | acpi_status status; |
1da177e4 | 419 | |
f3d2e786 | 420 | ACPI_FUNCTION_TRACE(acpi_get_table_by_index); |
1da177e4 | 421 | |
c5fc42ac BM |
422 | /* Parameter validation */ |
423 | ||
424 | if (!table) { | |
425 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
426 | } | |
427 | ||
f3d2e786 | 428 | (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); |
1da177e4 | 429 | |
f3d2e786 | 430 | /* Validate index */ |
1da177e4 | 431 | |
b9ee2043 | 432 | if (table_index >= acpi_gbl_root_table_list.current_table_count) { |
f3d2e786 | 433 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); |
4be44fcd | 434 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
435 | } |
436 | ||
f3d2e786 | 437 | if (!acpi_gbl_root_table_list.tables[table_index].pointer) { |
1da177e4 | 438 | |
f3d2e786 | 439 | /* Table is not mapped, map it */ |
1da177e4 | 440 | |
f3d2e786 BM |
441 | status = |
442 | acpi_tb_verify_table(&acpi_gbl_root_table_list. | |
443 | tables[table_index]); | |
444 | if (ACPI_FAILURE(status)) { | |
445 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); | |
446 | return_ACPI_STATUS(status); | |
447 | } | |
1da177e4 LT |
448 | } |
449 | ||
f3d2e786 BM |
450 | *table = acpi_gbl_root_table_list.tables[table_index].pointer; |
451 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); | |
452 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
453 | } |
454 | ||
f3d2e786 | 455 | ACPI_EXPORT_SYMBOL(acpi_get_table_by_index) |
1da177e4 | 456 | |
67effe8f | 457 | |
3e08e2d2 LM |
458 | /******************************************************************************* |
459 | * | |
460 | * FUNCTION: acpi_install_table_handler | |
461 | * | |
ba494bee BM |
462 | * PARAMETERS: handler - Table event handler |
463 | * context - Value passed to the handler on each event | |
3e08e2d2 LM |
464 | * |
465 | * RETURN: Status | |
466 | * | |
467 | * DESCRIPTION: Install table event handler | |
468 | * | |
469 | ******************************************************************************/ | |
470 | acpi_status | |
471 | acpi_install_table_handler(acpi_tbl_handler handler, void *context) | |
472 | { | |
473 | acpi_status status; | |
474 | ||
475 | ACPI_FUNCTION_TRACE(acpi_install_table_handler); | |
476 | ||
477 | if (!handler) { | |
478 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
479 | } | |
480 | ||
481 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); | |
482 | if (ACPI_FAILURE(status)) { | |
483 | return_ACPI_STATUS(status); | |
484 | } | |
485 | ||
486 | /* Don't allow more than one handler */ | |
487 | ||
488 | if (acpi_gbl_table_handler) { | |
489 | status = AE_ALREADY_EXISTS; | |
490 | goto cleanup; | |
491 | } | |
492 | ||
493 | /* Install the handler */ | |
494 | ||
495 | acpi_gbl_table_handler = handler; | |
496 | acpi_gbl_table_handler_context = context; | |
497 | ||
498 | cleanup: | |
499 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
500 | return_ACPI_STATUS(status); | |
501 | } | |
502 | ||
503 | ACPI_EXPORT_SYMBOL(acpi_install_table_handler) | |
504 | ||
505 | /******************************************************************************* | |
506 | * | |
507 | * FUNCTION: acpi_remove_table_handler | |
508 | * | |
ba494bee | 509 | * PARAMETERS: handler - Table event handler that was installed |
3e08e2d2 LM |
510 | * previously. |
511 | * | |
512 | * RETURN: Status | |
513 | * | |
514 | * DESCRIPTION: Remove table event handler | |
515 | * | |
516 | ******************************************************************************/ | |
517 | acpi_status acpi_remove_table_handler(acpi_tbl_handler handler) | |
518 | { | |
519 | acpi_status status; | |
520 | ||
521 | ACPI_FUNCTION_TRACE(acpi_remove_table_handler); | |
522 | ||
523 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); | |
524 | if (ACPI_FAILURE(status)) { | |
525 | return_ACPI_STATUS(status); | |
526 | } | |
527 | ||
528 | /* Make sure that the installed handler is the same */ | |
529 | ||
530 | if (!handler || handler != acpi_gbl_table_handler) { | |
531 | status = AE_BAD_PARAMETER; | |
532 | goto cleanup; | |
533 | } | |
534 | ||
535 | /* Remove the handler */ | |
536 | ||
537 | acpi_gbl_table_handler = NULL; | |
538 | ||
539 | cleanup: | |
540 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
541 | return_ACPI_STATUS(status); | |
542 | } | |
543 | ||
544 | ACPI_EXPORT_SYMBOL(acpi_remove_table_handler) |