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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: tbxface - ACPI table-oriented external interfaces
5 *
6 * Copyright (C) 2000 - 2023, Intel Corp.
7 *
8 *****************************************************************************/
9
10#define EXPORT_ACPI_INTERFACES
11
12#include <acpi/acpi.h>
13#include "accommon.h"
14#include "actables.h"
15
16#define _COMPONENT ACPI_TABLES
17ACPI_MODULE_NAME("tbxface")
18
19/*******************************************************************************
20 *
21 * FUNCTION: acpi_allocate_root_table
22 *
23 * PARAMETERS: initial_table_count - Size of initial_table_array, in number of
24 * struct acpi_table_desc structures
25 *
26 * RETURN: Status
27 *
28 * DESCRIPTION: Allocate a root table array. Used by iASL compiler and
29 * acpi_initialize_tables.
30 *
31 ******************************************************************************/
32acpi_status acpi_allocate_root_table(u32 initial_table_count)
33{
34
35 acpi_gbl_root_table_list.max_table_count = initial_table_count;
36 acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
37
38 return (acpi_tb_resize_root_table_list());
39}
40
41/*******************************************************************************
42 *
43 * FUNCTION: acpi_initialize_tables
44 *
45 * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
46 * struct acpi_table_desc structures. If NULL, the
47 * array is dynamically allocated.
48 * initial_table_count - Size of initial_table_array, in number of
49 * struct acpi_table_desc structures
50 * allow_resize - Flag to tell Table Manager if resize of
51 * pre-allocated array is allowed. Ignored
52 * if initial_table_array is NULL.
53 *
54 * RETURN: Status
55 *
56 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
57 *
58 * NOTE: Allows static allocation of the initial table array in order
59 * to avoid the use of dynamic memory in confined environments
60 * such as the kernel boot sequence where it may not be available.
61 *
62 * If the host OS memory managers are initialized, use NULL for
63 * initial_table_array, and the table will be dynamically allocated.
64 *
65 ******************************************************************************/
66
67acpi_status ACPI_INIT_FUNCTION
68acpi_initialize_tables(struct acpi_table_desc *initial_table_array,
69 u32 initial_table_count, u8 allow_resize)
70{
71 acpi_physical_address rsdp_address;
72 acpi_status status;
73
74 ACPI_FUNCTION_TRACE(acpi_initialize_tables);
75
76 /*
77 * Setup the Root Table Array and allocate the table array
78 * if requested
79 */
80 if (!initial_table_array) {
81 status = acpi_allocate_root_table(initial_table_count);
82 if (ACPI_FAILURE(status)) {
83 return_ACPI_STATUS(status);
84 }
85 } else {
86 /* Root Table Array has been statically allocated by the host */
87
88 memset(initial_table_array, 0,
89 (acpi_size)initial_table_count *
90 sizeof(struct acpi_table_desc));
91
92 acpi_gbl_root_table_list.tables = initial_table_array;
93 acpi_gbl_root_table_list.max_table_count = initial_table_count;
94 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
95 if (allow_resize) {
96 acpi_gbl_root_table_list.flags |=
97 ACPI_ROOT_ALLOW_RESIZE;
98 }
99 }
100
101 /* Get the address of the RSDP */
102
103 rsdp_address = acpi_os_get_root_pointer();
104 if (!rsdp_address) {
105 return_ACPI_STATUS(AE_NOT_FOUND);
106 }
107
108 /*
109 * Get the root table (RSDT or XSDT) and extract all entries to the local
110 * Root Table Array. This array contains the information of the RSDT/XSDT
111 * in a common, more usable format.
112 */
113 status = acpi_tb_parse_root_table(rsdp_address);
114 return_ACPI_STATUS(status);
115}
116
117ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_tables)
118
119/*******************************************************************************
120 *
121 * FUNCTION: acpi_reallocate_root_table
122 *
123 * PARAMETERS: None
124 *
125 * RETURN: Status
126 *
127 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
128 * root list from the previously provided scratch area. Should
129 * be called once dynamic memory allocation is available in the
130 * kernel.
131 *
132 ******************************************************************************/
133acpi_status ACPI_INIT_FUNCTION acpi_reallocate_root_table(void)
134{
135 acpi_status status;
136 struct acpi_table_desc *table_desc;
137 u32 i, j;
138
139 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
140
141 /*
142 * If there are tables unverified, it is required to reallocate the
143 * root table list to clean up invalid table entries. Otherwise only
144 * reallocate the root table list if the host provided a static buffer
145 * for the table array in the call to acpi_initialize_tables().
146 */
147 if ((acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) &&
148 acpi_gbl_enable_table_validation) {
149 return_ACPI_STATUS(AE_SUPPORT);
150 }
151
152 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
153
154 /*
155 * Ensure OS early boot logic, which is required by some hosts. If the
156 * table state is reported to be wrong, developers should fix the
157 * issue by invoking acpi_put_table() for the reported table during the
158 * early stage.
159 */
160 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
161 table_desc = &acpi_gbl_root_table_list.tables[i];
162 if (table_desc->pointer) {
163 ACPI_ERROR((AE_INFO,
164 "Table [%4.4s] is not invalidated during early boot stage",
165 table_desc->signature.ascii));
166 }
167 }
168
169 if (!acpi_gbl_enable_table_validation) {
170 /*
171 * Now it's safe to do full table validation. We can do deferred
172 * table initialization here once the flag is set.
173 */
174 acpi_gbl_enable_table_validation = TRUE;
175 for (i = 0; i < acpi_gbl_root_table_list.current_table_count;
176 ++i) {
177 table_desc = &acpi_gbl_root_table_list.tables[i];
178 if (!(table_desc->flags & ACPI_TABLE_IS_VERIFIED)) {
179 status =
180 acpi_tb_verify_temp_table(table_desc, NULL,
181 &j);
182 if (ACPI_FAILURE(status)) {
183 acpi_tb_uninstall_table(table_desc);
184 }
185 }
186 }
187 }
188
189 acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
190 status = acpi_tb_resize_root_table_list();
191 acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
192
193 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
194 return_ACPI_STATUS(status);
195}
196
197ACPI_EXPORT_SYMBOL_INIT(acpi_reallocate_root_table)
198
199/*******************************************************************************
200 *
201 * FUNCTION: acpi_get_table_header
202 *
203 * PARAMETERS: signature - ACPI signature of needed table
204 * instance - Which instance (for SSDTs)
205 * out_table_header - The pointer to the where the table header
206 * is returned
207 *
208 * RETURN: Status and a copy of the table header
209 *
210 * DESCRIPTION: Finds and returns an ACPI table header. Caller provides the
211 * memory where a copy of the header is to be returned
212 * (fixed length).
213 *
214 ******************************************************************************/
215acpi_status
216acpi_get_table_header(char *signature,
217 u32 instance, struct acpi_table_header *out_table_header)
218{
219 u32 i;
220 u32 j;
221 struct acpi_table_header *header;
222
223 /* Parameter validation */
224
225 if (!signature || !out_table_header) {
226 return (AE_BAD_PARAMETER);
227 }
228
229 /* Walk the root table list */
230
231 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
232 i++) {
233 if (!ACPI_COMPARE_NAMESEG
234 (&(acpi_gbl_root_table_list.tables[i].signature),
235 signature)) {
236 continue;
237 }
238
239 if (++j < instance) {
240 continue;
241 }
242
243 if (!acpi_gbl_root_table_list.tables[i].pointer) {
244 if ((acpi_gbl_root_table_list.tables[i].flags &
245 ACPI_TABLE_ORIGIN_MASK) ==
246 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL) {
247 header =
248 acpi_os_map_memory(acpi_gbl_root_table_list.
249 tables[i].address,
250 sizeof(struct
251 acpi_table_header));
252 if (!header) {
253 return (AE_NO_MEMORY);
254 }
255
256 memcpy(out_table_header, header,
257 sizeof(struct acpi_table_header));
258 acpi_os_unmap_memory(header,
259 sizeof(struct
260 acpi_table_header));
261 } else {
262 return (AE_NOT_FOUND);
263 }
264 } else {
265 memcpy(out_table_header,
266 acpi_gbl_root_table_list.tables[i].pointer,
267 sizeof(struct acpi_table_header));
268 }
269 return (AE_OK);
270 }
271
272 return (AE_NOT_FOUND);
273}
274
275ACPI_EXPORT_SYMBOL(acpi_get_table_header)
276
277/*******************************************************************************
278 *
279 * FUNCTION: acpi_get_table
280 *
281 * PARAMETERS: signature - ACPI signature of needed table
282 * instance - Which instance (for SSDTs)
283 * out_table - Where the pointer to the table is returned
284 *
285 * RETURN: Status and pointer to the requested table
286 *
287 * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
288 * RSDT/XSDT.
289 * Note that an early stage acpi_get_table() call must be paired
290 * with an early stage acpi_put_table() call. otherwise the table
291 * pointer mapped by the early stage mapping implementation may be
292 * erroneously unmapped by the late stage unmapping implementation
293 * in an acpi_put_table() invoked during the late stage.
294 *
295 ******************************************************************************/
296acpi_status
297acpi_get_table(char *signature,
298 u32 instance, struct acpi_table_header ** out_table)
299{
300 u32 i;
301 u32 j;
302 acpi_status status = AE_NOT_FOUND;
303 struct acpi_table_desc *table_desc;
304
305 /* Parameter validation */
306
307 if (!signature || !out_table) {
308 return (AE_BAD_PARAMETER);
309 }
310
311 /*
312 * Note that the following line is required by some OSPMs, they only
313 * check if the returned table is NULL instead of the returned status
314 * to determined if this function is succeeded.
315 */
316 *out_table = NULL;
317
318 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
319
320 /* Walk the root table list */
321
322 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
323 i++) {
324 table_desc = &acpi_gbl_root_table_list.tables[i];
325
326 if (!ACPI_COMPARE_NAMESEG(&table_desc->signature, signature)) {
327 continue;
328 }
329
330 if (++j < instance) {
331 continue;
332 }
333
334 status = acpi_tb_get_table(table_desc, out_table);
335 break;
336 }
337
338 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
339 return (status);
340}
341
342ACPI_EXPORT_SYMBOL(acpi_get_table)
343
344/*******************************************************************************
345 *
346 * FUNCTION: acpi_put_table
347 *
348 * PARAMETERS: table - The pointer to the table
349 *
350 * RETURN: None
351 *
352 * DESCRIPTION: Release a table returned by acpi_get_table() and its clones.
353 * Note that it is not safe if this function was invoked after an
354 * uninstallation happened to the original table descriptor.
355 * Currently there is no OSPMs' requirement to handle such
356 * situations.
357 *
358 ******************************************************************************/
359void acpi_put_table(struct acpi_table_header *table)
360{
361 u32 i;
362 struct acpi_table_desc *table_desc;
363
364 ACPI_FUNCTION_TRACE(acpi_put_table);
365
366 if (!table) {
367 return_VOID;
368 }
369
370 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
371
372 /* Walk the root table list */
373
374 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
375 table_desc = &acpi_gbl_root_table_list.tables[i];
376
377 if (table_desc->pointer != table) {
378 continue;
379 }
380
381 acpi_tb_put_table(table_desc);
382 break;
383 }
384
385 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
386 return_VOID;
387}
388
389ACPI_EXPORT_SYMBOL(acpi_put_table)
390
391/*******************************************************************************
392 *
393 * FUNCTION: acpi_get_table_by_index
394 *
395 * PARAMETERS: table_index - Table index
396 * out_table - Where the pointer to the table is returned
397 *
398 * RETURN: Status and pointer to the requested table
399 *
400 * DESCRIPTION: Obtain a table by an index into the global table list. Used
401 * internally also.
402 *
403 ******************************************************************************/
404acpi_status
405acpi_get_table_by_index(u32 table_index, struct acpi_table_header **out_table)
406{
407 acpi_status status;
408
409 ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
410
411 /* Parameter validation */
412
413 if (!out_table) {
414 return_ACPI_STATUS(AE_BAD_PARAMETER);
415 }
416
417 /*
418 * Note that the following line is required by some OSPMs, they only
419 * check if the returned table is NULL instead of the returned status
420 * to determined if this function is succeeded.
421 */
422 *out_table = NULL;
423
424 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
425
426 /* Validate index */
427
428 if (table_index >= acpi_gbl_root_table_list.current_table_count) {
429 status = AE_BAD_PARAMETER;
430 goto unlock_and_exit;
431 }
432
433 status =
434 acpi_tb_get_table(&acpi_gbl_root_table_list.tables[table_index],
435 out_table);
436
437unlock_and_exit:
438 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
439 return_ACPI_STATUS(status);
440}
441
442ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
443
444/*******************************************************************************
445 *
446 * FUNCTION: acpi_install_table_handler
447 *
448 * PARAMETERS: handler - Table event handler
449 * context - Value passed to the handler on each event
450 *
451 * RETURN: Status
452 *
453 * DESCRIPTION: Install a global table event handler.
454 *
455 ******************************************************************************/
456acpi_status
457acpi_install_table_handler(acpi_table_handler handler, void *context)
458{
459 acpi_status status;
460
461 ACPI_FUNCTION_TRACE(acpi_install_table_handler);
462
463 if (!handler) {
464 return_ACPI_STATUS(AE_BAD_PARAMETER);
465 }
466
467 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
468 if (ACPI_FAILURE(status)) {
469 return_ACPI_STATUS(status);
470 }
471
472 /* Don't allow more than one handler */
473
474 if (acpi_gbl_table_handler) {
475 status = AE_ALREADY_EXISTS;
476 goto cleanup;
477 }
478
479 /* Install the handler */
480
481 acpi_gbl_table_handler = handler;
482 acpi_gbl_table_handler_context = context;
483
484cleanup:
485 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
486 return_ACPI_STATUS(status);
487}
488
489ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
490
491/*******************************************************************************
492 *
493 * FUNCTION: acpi_remove_table_handler
494 *
495 * PARAMETERS: handler - Table event handler that was installed
496 * previously.
497 *
498 * RETURN: Status
499 *
500 * DESCRIPTION: Remove a table event handler
501 *
502 ******************************************************************************/
503acpi_status acpi_remove_table_handler(acpi_table_handler handler)
504{
505 acpi_status status;
506
507 ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
508
509 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
510 if (ACPI_FAILURE(status)) {
511 return_ACPI_STATUS(status);
512 }
513
514 /* Make sure that the installed handler is the same */
515
516 if (!handler || handler != acpi_gbl_table_handler) {
517 status = AE_BAD_PARAMETER;
518 goto cleanup;
519 }
520
521 /* Remove the handler */
522
523 acpi_gbl_table_handler = NULL;
524
525cleanup:
526 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
527 return_ACPI_STATUS(status);
528}
529
530ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
1/******************************************************************************
2 *
3 * Module Name: tbxface - Public interfaces to the ACPI subsystem
4 * ACPI table oriented interfaces
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2012, Intel Corp.
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
45#include <linux/export.h>
46#include <acpi/acpi.h>
47#include "accommon.h"
48#include "acnamesp.h"
49#include "actables.h"
50
51#define _COMPONENT ACPI_TABLES
52ACPI_MODULE_NAME("tbxface")
53
54/* Local prototypes */
55static acpi_status acpi_tb_load_namespace(void);
56
57static int no_auto_ssdt;
58
59/*******************************************************************************
60 *
61 * FUNCTION: acpi_allocate_root_table
62 *
63 * PARAMETERS: initial_table_count - Size of initial_table_array, in number of
64 * struct acpi_table_desc structures
65 *
66 * RETURN: Status
67 *
68 * DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and
69 * acpi_initialize_tables.
70 *
71 ******************************************************************************/
72
73acpi_status acpi_allocate_root_table(u32 initial_table_count)
74{
75
76 acpi_gbl_root_table_list.max_table_count = initial_table_count;
77 acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
78
79 return (acpi_tb_resize_root_table_list());
80}
81
82/*******************************************************************************
83 *
84 * FUNCTION: acpi_initialize_tables
85 *
86 * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
87 * struct acpi_table_desc structures. If NULL, the
88 * array is dynamically allocated.
89 * initial_table_count - Size of initial_table_array, in number of
90 * struct acpi_table_desc structures
91 * allow_realloc - Flag to tell Table Manager if resize of
92 * pre-allocated array is allowed. Ignored
93 * if initial_table_array is NULL.
94 *
95 * RETURN: Status
96 *
97 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
98 *
99 * NOTE: Allows static allocation of the initial table array in order
100 * to avoid the use of dynamic memory in confined environments
101 * such as the kernel boot sequence where it may not be available.
102 *
103 * If the host OS memory managers are initialized, use NULL for
104 * initial_table_array, and the table will be dynamically allocated.
105 *
106 ******************************************************************************/
107
108acpi_status __init
109acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
110 u32 initial_table_count, u8 allow_resize)
111{
112 acpi_physical_address rsdp_address;
113 acpi_status status;
114
115 ACPI_FUNCTION_TRACE(acpi_initialize_tables);
116
117 /*
118 * Set up the Root Table Array
119 * Allocate the table array if requested
120 */
121 if (!initial_table_array) {
122 status = acpi_allocate_root_table(initial_table_count);
123 if (ACPI_FAILURE(status)) {
124 return_ACPI_STATUS(status);
125 }
126 } else {
127 /* Root Table Array has been statically allocated by the host */
128
129 ACPI_MEMSET(initial_table_array, 0,
130 (acpi_size) initial_table_count *
131 sizeof(struct acpi_table_desc));
132
133 acpi_gbl_root_table_list.tables = initial_table_array;
134 acpi_gbl_root_table_list.max_table_count = initial_table_count;
135 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
136 if (allow_resize) {
137 acpi_gbl_root_table_list.flags |=
138 ACPI_ROOT_ALLOW_RESIZE;
139 }
140 }
141
142 /* Get the address of the RSDP */
143
144 rsdp_address = acpi_os_get_root_pointer();
145 if (!rsdp_address) {
146 return_ACPI_STATUS(AE_NOT_FOUND);
147 }
148
149 /*
150 * Get the root table (RSDT or XSDT) and extract all entries to the local
151 * Root Table Array. This array contains the information of the RSDT/XSDT
152 * in a common, more useable format.
153 */
154 status = acpi_tb_parse_root_table(rsdp_address);
155 return_ACPI_STATUS(status);
156}
157
158/*******************************************************************************
159 *
160 * FUNCTION: acpi_reallocate_root_table
161 *
162 * PARAMETERS: None
163 *
164 * RETURN: Status
165 *
166 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
167 * root list from the previously provided scratch area. Should
168 * be called once dynamic memory allocation is available in the
169 * kernel
170 *
171 ******************************************************************************/
172acpi_status acpi_reallocate_root_table(void)
173{
174 struct acpi_table_desc *tables;
175 acpi_size new_size;
176 acpi_size current_size;
177
178 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
179
180 /*
181 * Only reallocate the root table if the host provided a static buffer
182 * for the table array in the call to acpi_initialize_tables.
183 */
184 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
185 return_ACPI_STATUS(AE_SUPPORT);
186 }
187
188 /*
189 * Get the current size of the root table and add the default
190 * increment to create the new table size.
191 */
192 current_size = (acpi_size)
193 acpi_gbl_root_table_list.current_table_count *
194 sizeof(struct acpi_table_desc);
195
196 new_size = current_size +
197 (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc));
198
199 /* Create new array and copy the old array */
200
201 tables = ACPI_ALLOCATE_ZEROED(new_size);
202 if (!tables) {
203 return_ACPI_STATUS(AE_NO_MEMORY);
204 }
205
206 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size);
207
208 /*
209 * Update the root table descriptor. The new size will be the current
210 * number of tables plus the increment, independent of the reserved
211 * size of the original table list.
212 */
213 acpi_gbl_root_table_list.tables = tables;
214 acpi_gbl_root_table_list.max_table_count =
215 acpi_gbl_root_table_list.current_table_count +
216 ACPI_ROOT_TABLE_SIZE_INCREMENT;
217 acpi_gbl_root_table_list.flags =
218 ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
219
220 return_ACPI_STATUS(AE_OK);
221}
222
223/*******************************************************************************
224 *
225 * FUNCTION: acpi_load_table
226 *
227 * PARAMETERS: table_ptr - pointer to a buffer containing the entire
228 * table to be loaded
229 *
230 * RETURN: Status
231 *
232 * DESCRIPTION: This function is called to load a table from the caller's
233 * buffer. The buffer must contain an entire ACPI Table including
234 * a valid header. The header fields will be verified, and if it
235 * is determined that the table is invalid, the call will fail.
236 *
237 ******************************************************************************/
238acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
239{
240 acpi_status status;
241 u32 table_index;
242 struct acpi_table_desc table_desc;
243
244 if (!table_ptr)
245 return AE_BAD_PARAMETER;
246
247 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
248 table_desc.pointer = table_ptr;
249 table_desc.length = table_ptr->length;
250 table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
251
252 /*
253 * Install the new table into the local data structures
254 */
255 status = acpi_tb_add_table(&table_desc, &table_index);
256 if (ACPI_FAILURE(status)) {
257 return status;
258 }
259 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
260 return status;
261}
262
263ACPI_EXPORT_SYMBOL(acpi_load_table)
264
265/*******************************************************************************
266 *
267 * FUNCTION: acpi_get_table_header
268 *
269 * PARAMETERS: Signature - ACPI signature of needed table
270 * Instance - Which instance (for SSDTs)
271 * out_table_header - The pointer to the table header to fill
272 *
273 * RETURN: Status and pointer to mapped table header
274 *
275 * DESCRIPTION: Finds an ACPI table header.
276 *
277 * NOTE: Caller is responsible in unmapping the header with
278 * acpi_os_unmap_memory
279 *
280 ******************************************************************************/
281acpi_status
282acpi_get_table_header(char *signature,
283 u32 instance, struct acpi_table_header *out_table_header)
284{
285 u32 i;
286 u32 j;
287 struct acpi_table_header *header;
288
289 /* Parameter validation */
290
291 if (!signature || !out_table_header) {
292 return (AE_BAD_PARAMETER);
293 }
294
295 /* Walk the root table list */
296
297 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
298 i++) {
299 if (!ACPI_COMPARE_NAME
300 (&(acpi_gbl_root_table_list.tables[i].signature),
301 signature)) {
302 continue;
303 }
304
305 if (++j < instance) {
306 continue;
307 }
308
309 if (!acpi_gbl_root_table_list.tables[i].pointer) {
310 if ((acpi_gbl_root_table_list.tables[i].flags &
311 ACPI_TABLE_ORIGIN_MASK) ==
312 ACPI_TABLE_ORIGIN_MAPPED) {
313 header =
314 acpi_os_map_memory(acpi_gbl_root_table_list.
315 tables[i].address,
316 sizeof(struct
317 acpi_table_header));
318 if (!header) {
319 return AE_NO_MEMORY;
320 }
321 ACPI_MEMCPY(out_table_header, header,
322 sizeof(struct acpi_table_header));
323 acpi_os_unmap_memory(header,
324 sizeof(struct
325 acpi_table_header));
326 } else {
327 return AE_NOT_FOUND;
328 }
329 } else {
330 ACPI_MEMCPY(out_table_header,
331 acpi_gbl_root_table_list.tables[i].pointer,
332 sizeof(struct acpi_table_header));
333 }
334 return (AE_OK);
335 }
336
337 return (AE_NOT_FOUND);
338}
339
340ACPI_EXPORT_SYMBOL(acpi_get_table_header)
341
342/*******************************************************************************
343 *
344 * FUNCTION: acpi_unload_table_id
345 *
346 * PARAMETERS: id - Owner ID of the table to be removed.
347 *
348 * RETURN: Status
349 *
350 * DESCRIPTION: This routine is used to force the unload of a table (by id)
351 *
352 ******************************************************************************/
353acpi_status acpi_unload_table_id(acpi_owner_id id)
354{
355 int i;
356 acpi_status status = AE_NOT_EXIST;
357
358 ACPI_FUNCTION_TRACE(acpi_unload_table_id);
359
360 /* Find table in the global table list */
361 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
362 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
363 continue;
364 }
365 /*
366 * Delete all namespace objects owned by this table. Note that these
367 * objects can appear anywhere in the namespace by virtue of the AML
368 * "Scope" operator. Thus, we need to track ownership by an ID, not
369 * simply a position within the hierarchy
370 */
371 acpi_tb_delete_namespace_by_owner(i);
372 status = acpi_tb_release_owner_id(i);
373 acpi_tb_set_table_loaded_flag(i, FALSE);
374 break;
375 }
376 return_ACPI_STATUS(status);
377}
378
379ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
380
381/*******************************************************************************
382 *
383 * FUNCTION: acpi_get_table_with_size
384 *
385 * PARAMETERS: Signature - ACPI signature of needed table
386 * Instance - Which instance (for SSDTs)
387 * out_table - Where the pointer to the table is returned
388 *
389 * RETURN: Status and pointer to table
390 *
391 * DESCRIPTION: Finds and verifies an ACPI table.
392 *
393 ******************************************************************************/
394acpi_status
395acpi_get_table_with_size(char *signature,
396 u32 instance, struct acpi_table_header **out_table,
397 acpi_size *tbl_size)
398{
399 u32 i;
400 u32 j;
401 acpi_status status;
402
403 /* Parameter validation */
404
405 if (!signature || !out_table) {
406 return (AE_BAD_PARAMETER);
407 }
408
409 /* Walk the root table list */
410
411 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
412 i++) {
413 if (!ACPI_COMPARE_NAME
414 (&(acpi_gbl_root_table_list.tables[i].signature),
415 signature)) {
416 continue;
417 }
418
419 if (++j < instance) {
420 continue;
421 }
422
423 status =
424 acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
425 if (ACPI_SUCCESS(status)) {
426 *out_table = acpi_gbl_root_table_list.tables[i].pointer;
427 *tbl_size = acpi_gbl_root_table_list.tables[i].length;
428 }
429
430 if (!acpi_gbl_permanent_mmap) {
431 acpi_gbl_root_table_list.tables[i].pointer = NULL;
432 }
433
434 return (status);
435 }
436
437 return (AE_NOT_FOUND);
438}
439ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)
440
441acpi_status
442acpi_get_table(char *signature,
443 u32 instance, struct acpi_table_header **out_table)
444{
445 acpi_size tbl_size;
446
447 return acpi_get_table_with_size(signature,
448 instance, out_table, &tbl_size);
449}
450ACPI_EXPORT_SYMBOL(acpi_get_table)
451
452/*******************************************************************************
453 *
454 * FUNCTION: acpi_get_table_by_index
455 *
456 * PARAMETERS: table_index - Table index
457 * Table - Where the pointer to the table is returned
458 *
459 * RETURN: Status and pointer to the table
460 *
461 * DESCRIPTION: Obtain a table by an index into the global table list.
462 *
463 ******************************************************************************/
464acpi_status
465acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
466{
467 acpi_status status;
468
469 ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
470
471 /* Parameter validation */
472
473 if (!table) {
474 return_ACPI_STATUS(AE_BAD_PARAMETER);
475 }
476
477 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
478
479 /* Validate index */
480
481 if (table_index >= acpi_gbl_root_table_list.current_table_count) {
482 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
483 return_ACPI_STATUS(AE_BAD_PARAMETER);
484 }
485
486 if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
487
488 /* Table is not mapped, map it */
489
490 status =
491 acpi_tb_verify_table(&acpi_gbl_root_table_list.
492 tables[table_index]);
493 if (ACPI_FAILURE(status)) {
494 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
495 return_ACPI_STATUS(status);
496 }
497 }
498
499 *table = acpi_gbl_root_table_list.tables[table_index].pointer;
500 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
501 return_ACPI_STATUS(AE_OK);
502}
503
504ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
505
506/*******************************************************************************
507 *
508 * FUNCTION: acpi_tb_load_namespace
509 *
510 * PARAMETERS: None
511 *
512 * RETURN: Status
513 *
514 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
515 * the RSDT/XSDT.
516 *
517 ******************************************************************************/
518static acpi_status acpi_tb_load_namespace(void)
519{
520 acpi_status status;
521 u32 i;
522 struct acpi_table_header *new_dsdt;
523
524 ACPI_FUNCTION_TRACE(tb_load_namespace);
525
526 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
527
528 /*
529 * Load the namespace. The DSDT is required, but any SSDT and
530 * PSDT tables are optional. Verify the DSDT.
531 */
532 if (!acpi_gbl_root_table_list.current_table_count ||
533 !ACPI_COMPARE_NAME(&
534 (acpi_gbl_root_table_list.
535 tables[ACPI_TABLE_INDEX_DSDT].signature),
536 ACPI_SIG_DSDT)
537 ||
538 ACPI_FAILURE(acpi_tb_verify_table
539 (&acpi_gbl_root_table_list.
540 tables[ACPI_TABLE_INDEX_DSDT]))) {
541 status = AE_NO_ACPI_TABLES;
542 goto unlock_and_exit;
543 }
544
545 /*
546 * Save the DSDT pointer for simple access. This is the mapped memory
547 * address. We must take care here because the address of the .Tables
548 * array can change dynamically as tables are loaded at run-time. Note:
549 * .Pointer field is not validated until after call to acpi_tb_verify_table.
550 */
551 acpi_gbl_DSDT =
552 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
553
554 /*
555 * Optionally copy the entire DSDT to local memory (instead of simply
556 * mapping it.) There are some BIOSs that corrupt or replace the original
557 * DSDT, creating the need for this option. Default is FALSE, do not copy
558 * the DSDT.
559 */
560 if (acpi_gbl_copy_dsdt_locally) {
561 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
562 if (new_dsdt) {
563 acpi_gbl_DSDT = new_dsdt;
564 }
565 }
566
567 /*
568 * Save the original DSDT header for detection of table corruption
569 * and/or replacement of the DSDT from outside the OS.
570 */
571 ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
572 sizeof(struct acpi_table_header));
573
574 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
575
576 /* Load and parse tables */
577
578 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
579 if (ACPI_FAILURE(status)) {
580 return_ACPI_STATUS(status);
581 }
582
583 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
584
585 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
586 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
587 if ((!ACPI_COMPARE_NAME
588 (&(acpi_gbl_root_table_list.tables[i].signature),
589 ACPI_SIG_SSDT)
590 &&
591 !ACPI_COMPARE_NAME(&
592 (acpi_gbl_root_table_list.tables[i].
593 signature), ACPI_SIG_PSDT))
594 ||
595 ACPI_FAILURE(acpi_tb_verify_table
596 (&acpi_gbl_root_table_list.tables[i]))) {
597 continue;
598 }
599
600 if (no_auto_ssdt) {
601 printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
602 continue;
603 }
604
605 /* Ignore errors while loading tables, get as many as possible */
606
607 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
608 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
609 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
610 }
611
612 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
613
614 unlock_and_exit:
615 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
616 return_ACPI_STATUS(status);
617}
618
619/*******************************************************************************
620 *
621 * FUNCTION: acpi_load_tables
622 *
623 * PARAMETERS: None
624 *
625 * RETURN: Status
626 *
627 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
628 *
629 ******************************************************************************/
630
631acpi_status acpi_load_tables(void)
632{
633 acpi_status status;
634
635 ACPI_FUNCTION_TRACE(acpi_load_tables);
636
637 /* Load the namespace from the tables */
638
639 status = acpi_tb_load_namespace();
640 if (ACPI_FAILURE(status)) {
641 ACPI_EXCEPTION((AE_INFO, status,
642 "While loading namespace from ACPI tables"));
643 }
644
645 return_ACPI_STATUS(status);
646}
647
648ACPI_EXPORT_SYMBOL(acpi_load_tables)
649
650
651/*******************************************************************************
652 *
653 * FUNCTION: acpi_install_table_handler
654 *
655 * PARAMETERS: Handler - Table event handler
656 * Context - Value passed to the handler on each event
657 *
658 * RETURN: Status
659 *
660 * DESCRIPTION: Install table event handler
661 *
662 ******************************************************************************/
663acpi_status
664acpi_install_table_handler(acpi_tbl_handler handler, void *context)
665{
666 acpi_status status;
667
668 ACPI_FUNCTION_TRACE(acpi_install_table_handler);
669
670 if (!handler) {
671 return_ACPI_STATUS(AE_BAD_PARAMETER);
672 }
673
674 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
675 if (ACPI_FAILURE(status)) {
676 return_ACPI_STATUS(status);
677 }
678
679 /* Don't allow more than one handler */
680
681 if (acpi_gbl_table_handler) {
682 status = AE_ALREADY_EXISTS;
683 goto cleanup;
684 }
685
686 /* Install the handler */
687
688 acpi_gbl_table_handler = handler;
689 acpi_gbl_table_handler_context = context;
690
691 cleanup:
692 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
693 return_ACPI_STATUS(status);
694}
695
696ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
697
698/*******************************************************************************
699 *
700 * FUNCTION: acpi_remove_table_handler
701 *
702 * PARAMETERS: Handler - Table event handler that was installed
703 * previously.
704 *
705 * RETURN: Status
706 *
707 * DESCRIPTION: Remove table event handler
708 *
709 ******************************************************************************/
710acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
711{
712 acpi_status status;
713
714 ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
715
716 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
717 if (ACPI_FAILURE(status)) {
718 return_ACPI_STATUS(status);
719 }
720
721 /* Make sure that the installed handler is the same */
722
723 if (!handler || handler != acpi_gbl_table_handler) {
724 status = AE_BAD_PARAMETER;
725 goto cleanup;
726 }
727
728 /* Remove the handler */
729
730 acpi_gbl_table_handler = NULL;
731
732 cleanup:
733 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
734 return_ACPI_STATUS(status);
735}
736
737ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
738
739
740static int __init acpi_no_auto_ssdt_setup(char *s) {
741
742 printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
743
744 no_auto_ssdt = 1;
745
746 return 1;
747}
748
749__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);