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1 /******************************************************************************
2  *
3  * Module Name: tbxface - ACPI table-oriented external interfaces
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2017, Intel Corp.
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
44 #define EXPORT_ACPI_INTERFACES
45
46 #include <acpi/acpi.h>
47 #include "accommon.h"
48 #include "actables.h"
49
50 #define _COMPONENT          ACPI_TABLES
51 ACPI_MODULE_NAME("tbxface")
52
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  *
62  * DESCRIPTION: Allocate a root table array. Used by iASL compiler and
63  *              acpi_initialize_tables.
64  *
65  ******************************************************************************/
66 acpi_status acpi_allocate_root_table(u32 initial_table_count)
67 {
68
69         acpi_gbl_root_table_list.max_table_count = initial_table_count;
70         acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
71
72         return (acpi_tb_resize_root_table_list());
73 }
74
75 /*******************************************************************************
76  *
77  * FUNCTION:    acpi_initialize_tables
78  *
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_resize        - Flag to tell Table Manager if resize of
85  *                                    pre-allocated array is allowed. Ignored
86  *                                    if initial_table_array is NULL.
87  *
88  * RETURN:      Status
89  *
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.
98  *
99  ******************************************************************************/
100
101 acpi_status ACPI_INIT_FUNCTION
102 acpi_initialize_tables(struct acpi_table_desc *initial_table_array,
103                        u32 initial_table_count, u8 allow_resize)
104 {
105         acpi_physical_address rsdp_address;
106         acpi_status status;
107
108         ACPI_FUNCTION_TRACE(acpi_initialize_tables);
109
110         /*
111          * Setup the Root Table Array and allocate the table array
112          * if requested
113          */
114         if (!initial_table_array) {
115                 status = acpi_allocate_root_table(initial_table_count);
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
122                 memset(initial_table_array, 0,
123                        (acpi_size)initial_table_count *
124                        sizeof(struct acpi_table_desc));
125
126                 acpi_gbl_root_table_list.tables = initial_table_array;
127                 acpi_gbl_root_table_list.max_table_count = initial_table_count;
128                 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
129                 if (allow_resize) {
130                         acpi_gbl_root_table_list.flags |=
131                             ACPI_ROOT_ALLOW_RESIZE;
132                 }
133         }
134
135         /* Get the address of the RSDP */
136
137         rsdp_address = acpi_os_get_root_pointer();
138         if (!rsdp_address) {
139                 return_ACPI_STATUS(AE_NOT_FOUND);
140         }
141
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          */
147         status = acpi_tb_parse_root_table(rsdp_address);
148         return_ACPI_STATUS(status);
149 }
150
151 ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_tables)
152
153 /*******************************************************************************
154  *
155  * FUNCTION:    acpi_reallocate_root_table
156  *
157  * PARAMETERS:  None
158  *
159  * RETURN:      Status
160  *
161  * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
162  *              root list from the previously provided scratch area. Should
163  *              be called once dynamic memory allocation is available in the
164  *              kernel.
165  *
166  ******************************************************************************/
167 acpi_status ACPI_INIT_FUNCTION acpi_reallocate_root_table(void)
168 {
169         acpi_status status;
170         u32 i;
171
172         ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
173
174         /*
175          * Only reallocate the root table if the host provided a static buffer
176          * for the table array in the call to acpi_initialize_tables.
177          */
178         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
179                 return_ACPI_STATUS(AE_SUPPORT);
180         }
181
182         /*
183          * Ensure OS early boot logic, which is required by some hosts. If the
184          * table state is reported to be wrong, developers should fix the
185          * issue by invoking acpi_put_table() for the reported table during the
186          * early stage.
187          */
188         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
189                 if (acpi_gbl_root_table_list.tables[i].pointer) {
190                         ACPI_ERROR((AE_INFO,
191                                     "Table [%4.4s] is not invalidated during early boot stage",
192                                     acpi_gbl_root_table_list.tables[i].
193                                     signature.ascii));
194                 }
195         }
196
197         acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
198
199         status = acpi_tb_resize_root_table_list();
200         return_ACPI_STATUS(status);
201 }
202
203 ACPI_EXPORT_SYMBOL_INIT(acpi_reallocate_root_table)
204
205 /*******************************************************************************
206  *
207  * FUNCTION:    acpi_get_table_header
208  *
209  * PARAMETERS:  signature           - ACPI signature of needed table
210  *              instance            - Which instance (for SSDTs)
211  *              out_table_header    - The pointer to the table header to fill
212  *
213  * RETURN:      Status and pointer to mapped table header
214  *
215  * DESCRIPTION: Finds an ACPI table header.
216  *
217  * NOTE:        Caller is responsible in unmapping the header with
218  *              acpi_os_unmap_memory
219  *
220  ******************************************************************************/
221 acpi_status
222 acpi_get_table_header(char *signature,
223                       u32 instance, struct acpi_table_header *out_table_header)
224 {
225         u32 i;
226         u32 j;
227         struct acpi_table_header *header;
228
229         /* Parameter validation */
230
231         if (!signature || !out_table_header) {
232                 return (AE_BAD_PARAMETER);
233         }
234
235         /* Walk the root table list */
236
237         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
238              i++) {
239                 if (!ACPI_COMPARE_NAME
240                     (&(acpi_gbl_root_table_list.tables[i].signature),
241                      signature)) {
242                         continue;
243                 }
244
245                 if (++j < instance) {
246                         continue;
247                 }
248
249                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
250                         if ((acpi_gbl_root_table_list.tables[i].flags &
251                              ACPI_TABLE_ORIGIN_MASK) ==
252                             ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL) {
253                                 header =
254                                     acpi_os_map_memory(acpi_gbl_root_table_list.
255                                                        tables[i].address,
256                                                        sizeof(struct
257                                                               acpi_table_header));
258                                 if (!header) {
259                                         return (AE_NO_MEMORY);
260                                 }
261
262                                 memcpy(out_table_header, header,
263                                        sizeof(struct acpi_table_header));
264                                 acpi_os_unmap_memory(header,
265                                                      sizeof(struct
266                                                             acpi_table_header));
267                         } else {
268                                 return (AE_NOT_FOUND);
269                         }
270                 } else {
271                         memcpy(out_table_header,
272                                acpi_gbl_root_table_list.tables[i].pointer,
273                                sizeof(struct acpi_table_header));
274                 }
275                 return (AE_OK);
276         }
277
278         return (AE_NOT_FOUND);
279 }
280
281 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
282
283 /*******************************************************************************
284  *
285  * FUNCTION:    acpi_get_table
286  *
287  * PARAMETERS:  signature           - ACPI signature of needed table
288  *              instance            - Which instance (for SSDTs)
289  *              out_table           - Where the pointer to the table is returned
290  *
291  * RETURN:      Status and pointer to the requested table
292  *
293  * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
294  *              RSDT/XSDT.
295  *              Note that an early stage acpi_get_table() call must be paired
296  *              with an early stage acpi_put_table() call. otherwise the table
297  *              pointer mapped by the early stage mapping implementation may be
298  *              erroneously unmapped by the late stage unmapping implementation
299  *              in an acpi_put_table() invoked during the late stage.
300  *
301  ******************************************************************************/
302 acpi_status
303 acpi_get_table(char *signature,
304                u32 instance, struct acpi_table_header ** out_table)
305 {
306         u32 i;
307         u32 j;
308         acpi_status status = AE_NOT_FOUND;
309         struct acpi_table_desc *table_desc;
310
311         /* Parameter validation */
312
313         if (!signature || !out_table) {
314                 return (AE_BAD_PARAMETER);
315         }
316
317         /*
318          * Note that the following line is required by some OSPMs, they only
319          * check if the returned table is NULL instead of the returned status
320          * to determined if this function is succeeded.
321          */
322         *out_table = NULL;
323
324         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
325
326         /* Walk the root table list */
327
328         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
329              i++) {
330                 table_desc = &acpi_gbl_root_table_list.tables[i];
331
332                 if (!ACPI_COMPARE_NAME(&table_desc->signature, signature)) {
333                         continue;
334                 }
335
336                 if (++j < instance) {
337                         continue;
338                 }
339
340                 status = acpi_tb_get_table(table_desc, out_table);
341                 break;
342         }
343
344         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
345         return (status);
346 }
347
348 ACPI_EXPORT_SYMBOL(acpi_get_table)
349
350 /*******************************************************************************
351  *
352  * FUNCTION:    acpi_put_table
353  *
354  * PARAMETERS:  table               - The pointer to the table
355  *
356  * RETURN:      None
357  *
358  * DESCRIPTION: Release a table returned by acpi_get_table() and its clones.
359  *              Note that it is not safe if this function was invoked after an
360  *              uninstallation happened to the original table descriptor.
361  *              Currently there is no OSPMs' requirement to handle such
362  *              situations.
363  *
364  ******************************************************************************/
365 void acpi_put_table(struct acpi_table_header *table)
366 {
367         u32 i;
368         struct acpi_table_desc *table_desc;
369
370         ACPI_FUNCTION_TRACE(acpi_put_table);
371
372         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
373
374         /* Walk the root table list */
375
376         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
377                 table_desc = &acpi_gbl_root_table_list.tables[i];
378
379                 if (table_desc->pointer != table) {
380                         continue;
381                 }
382
383                 acpi_tb_put_table(table_desc);
384                 break;
385         }
386
387         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
388         return_VOID;
389 }
390
391 ACPI_EXPORT_SYMBOL(acpi_put_table)
392
393 /*******************************************************************************
394  *
395  * FUNCTION:    acpi_get_table_by_index
396  *
397  * PARAMETERS:  table_index         - Table index
398  *              out_table           - Where the pointer to the table is returned
399  *
400  * RETURN:      Status and pointer to the requested table
401  *
402  * DESCRIPTION: Obtain a table by an index into the global table list. Used
403  *              internally also.
404  *
405  ******************************************************************************/
406 acpi_status
407 acpi_get_table_by_index(u32 table_index, struct acpi_table_header **out_table)
408 {
409         acpi_status status;
410
411         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
412
413         /* Parameter validation */
414
415         if (!out_table) {
416                 return_ACPI_STATUS(AE_BAD_PARAMETER);
417         }
418
419         /*
420          * Note that the following line is required by some OSPMs, they only
421          * check if the returned table is NULL instead of the returned status
422          * to determined if this function is succeeded.
423          */
424         *out_table = NULL;
425
426         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
427
428         /* Validate index */
429
430         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
431                 status = AE_BAD_PARAMETER;
432                 goto unlock_and_exit;
433         }
434
435         status =
436             acpi_tb_get_table(&acpi_gbl_root_table_list.tables[table_index],
437                               out_table);
438
439 unlock_and_exit:
440         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
441         return_ACPI_STATUS(status);
442 }
443
444 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
445
446 /*******************************************************************************
447  *
448  * FUNCTION:    acpi_install_table_handler
449  *
450  * PARAMETERS:  handler         - Table event handler
451  *              context         - Value passed to the handler on each event
452  *
453  * RETURN:      Status
454  *
455  * DESCRIPTION: Install a global table event handler.
456  *
457  ******************************************************************************/
458 acpi_status
459 acpi_install_table_handler(acpi_table_handler handler, void *context)
460 {
461         acpi_status status;
462
463         ACPI_FUNCTION_TRACE(acpi_install_table_handler);
464
465         if (!handler) {
466                 return_ACPI_STATUS(AE_BAD_PARAMETER);
467         }
468
469         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
470         if (ACPI_FAILURE(status)) {
471                 return_ACPI_STATUS(status);
472         }
473
474         /* Don't allow more than one handler */
475
476         if (acpi_gbl_table_handler) {
477                 status = AE_ALREADY_EXISTS;
478                 goto cleanup;
479         }
480
481         /* Install the handler */
482
483         acpi_gbl_table_handler = handler;
484         acpi_gbl_table_handler_context = context;
485
486 cleanup:
487         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
488         return_ACPI_STATUS(status);
489 }
490
491 ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
492
493 /*******************************************************************************
494  *
495  * FUNCTION:    acpi_remove_table_handler
496  *
497  * PARAMETERS:  handler         - Table event handler that was installed
498  *                                previously.
499  *
500  * RETURN:      Status
501  *
502  * DESCRIPTION: Remove a table event handler
503  *
504  ******************************************************************************/
505 acpi_status acpi_remove_table_handler(acpi_table_handler handler)
506 {
507         acpi_status status;
508
509         ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
510
511         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
512         if (ACPI_FAILURE(status)) {
513                 return_ACPI_STATUS(status);
514         }
515
516         /* Make sure that the installed handler is the same */
517
518         if (!handler || handler != acpi_gbl_table_handler) {
519                 status = AE_BAD_PARAMETER;
520                 goto cleanup;
521         }
522
523         /* Remove the handler */
524
525         acpi_gbl_table_handler = NULL;
526
527 cleanup:
528         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
529         return_ACPI_STATUS(status);
530 }
531
532 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)