blob: 0e319604d3e78fe5e197a2fcd4f6140cf0a1dcd3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/******************************************************************************
2 *
3 * Module Name: tbxface - Public interfaces to the ACPI subsystem
4 * ACPI table oriented interfaces
5 *
6 *****************************************************************************/
7
8/*
Len Brown75a44ce2008-04-23 23:00:13 -04009 * Copyright (C) 2000 - 2008, Intel Corp.
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <acpi/acpi.h>
46#include <acpi/acnamesp.h>
47#include <acpi/actables.h>
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#define _COMPONENT ACPI_TABLES
Len Brown4be44fc2005-08-05 00:44:28 -040050ACPI_MODULE_NAME("tbxface")
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Bob Mooref3d2e782007-02-02 19:48:18 +030052/* Local prototypes */
53static acpi_status acpi_tb_load_namespace(void);
54
Len Brown67effe82007-07-26 00:50:06 -040055static int no_auto_ssdt;
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057/*******************************************************************************
58 *
Bob Moore77389e12007-02-02 19:48:20 +030059 * FUNCTION: acpi_allocate_root_table
60 *
61 * PARAMETERS: initial_table_count - Size of initial_table_array, in number of
62 * struct acpi_table_desc structures
63 *
64 * RETURN: Status
65 *
66 * DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and
67 * acpi_initialize_tables.
68 *
69 ******************************************************************************/
70
71acpi_status acpi_allocate_root_table(u32 initial_table_count)
72{
73
74 acpi_gbl_root_table_list.size = initial_table_count;
75 acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
76
77 return (acpi_tb_resize_root_table_list());
78}
79
80/*******************************************************************************
81 *
Bob Mooref3d2e782007-02-02 19:48:18 +030082 * FUNCTION: acpi_initialize_tables
83 *
84 * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
85 * struct acpi_table_desc structures. If NULL, the
86 * array is dynamically allocated.
87 * initial_table_count - Size of initial_table_array, in number of
88 * struct acpi_table_desc structures
89 * allow_realloc - Flag to tell Table Manager if resize of
90 * pre-allocated array is allowed. Ignored
91 * if initial_table_array is NULL.
92 *
93 * RETURN: Status
94 *
95 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
96 *
97 * NOTE: Allows static allocation of the initial table array in order
98 * to avoid the use of dynamic memory in confined environments
99 * such as the kernel boot sequence where it may not be available.
100 *
101 * If the host OS memory managers are initialized, use NULL for
102 * initial_table_array, and the table will be dynamically allocated.
103 *
104 ******************************************************************************/
105
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300106acpi_status __init
Bob Moore77389e12007-02-02 19:48:20 +0300107acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
Bob Mooref3d2e782007-02-02 19:48:18 +0300108 u32 initial_table_count, u8 allow_resize)
109{
Bob Moorec5fc42a2007-02-02 19:48:19 +0300110 acpi_physical_address rsdp_address;
Bob Mooref3d2e782007-02-02 19:48:18 +0300111 acpi_status status;
Bob Mooref3d2e782007-02-02 19:48:18 +0300112
113 ACPI_FUNCTION_TRACE(acpi_initialize_tables);
114
115 /*
116 * Set up the Root Table Array
117 * Allocate the table array if requested
118 */
119 if (!initial_table_array) {
Bob Moore77389e12007-02-02 19:48:20 +0300120 status = acpi_allocate_root_table(initial_table_count);
Bob Mooref3d2e782007-02-02 19:48:18 +0300121 if (ACPI_FAILURE(status)) {
122 return_ACPI_STATUS(status);
123 }
124 } else {
125 /* Root Table Array has been statically allocated by the host */
126
Bob Moorea4bbb812007-02-02 19:48:19 +0300127 ACPI_MEMSET(initial_table_array, 0,
Bob Moorec5fc42a2007-02-02 19:48:19 +0300128 initial_table_count *
Bob Moorea4bbb812007-02-02 19:48:19 +0300129 sizeof(struct acpi_table_desc));
Bob Moorec5fc42a2007-02-02 19:48:19 +0300130
Bob Mooref3d2e782007-02-02 19:48:18 +0300131 acpi_gbl_root_table_list.tables = initial_table_array;
132 acpi_gbl_root_table_list.size = initial_table_count;
Bob Moorec5fc42a2007-02-02 19:48:19 +0300133 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
Bob Mooref3d2e782007-02-02 19:48:18 +0300134 if (allow_resize) {
Bob Moorec5fc42a2007-02-02 19:48:19 +0300135 acpi_gbl_root_table_list.flags |=
136 ACPI_ROOT_ALLOW_RESIZE;
Bob Mooref3d2e782007-02-02 19:48:18 +0300137 }
138 }
139
Bob Moorec5fc42a2007-02-02 19:48:19 +0300140 /* Get the address of the RSDP */
Bob Mooref3d2e782007-02-02 19:48:18 +0300141
Bob Moorec5fc42a2007-02-02 19:48:19 +0300142 rsdp_address = acpi_os_get_root_pointer();
143 if (!rsdp_address) {
Bob Mooref3d2e782007-02-02 19:48:18 +0300144 return_ACPI_STATUS(AE_NOT_FOUND);
145 }
146
Bob Mooref3d2e782007-02-02 19:48:18 +0300147 /*
148 * Get the root table (RSDT or XSDT) and extract all entries to the local
149 * Root Table Array. This array contains the information of the RSDT/XSDT
150 * in a common, more useable format.
151 */
Bob Moorec5fc42a2007-02-02 19:48:19 +0300152 status =
153 acpi_tb_parse_root_table(rsdp_address, ACPI_TABLE_ORIGIN_MAPPED);
Bob Mooref3d2e782007-02-02 19:48:18 +0300154 return_ACPI_STATUS(status);
155}
156
Bob Mooref3d2e782007-02-02 19:48:18 +0300157/*******************************************************************************
158 *
159 * FUNCTION: acpi_reallocate_root_table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 *
161 * PARAMETERS: None
162 *
163 * RETURN: Status
164 *
Bob Mooref3d2e782007-02-02 19:48:18 +0300165 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
166 * root list from the previously provided scratch area. Should
167 * be called once dynamic memory allocation is available in the
168 * kernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 *
170 ******************************************************************************/
Bob Mooref3d2e782007-02-02 19:48:18 +0300171acpi_status acpi_reallocate_root_table(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
Bob Mooref3d2e782007-02-02 19:48:18 +0300173 struct acpi_table_desc *tables;
174 acpi_size new_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Bob Mooref3d2e782007-02-02 19:48:18 +0300176 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Bob Mooref3d2e782007-02-02 19:48:18 +0300178 /*
179 * Only reallocate the root table if the host provided a static buffer
180 * for the table array in the call to acpi_initialize_tables.
181 */
Bob Moorec5fc42a2007-02-02 19:48:19 +0300182 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
Bob Mooref3d2e782007-02-02 19:48:18 +0300183 return_ACPI_STATUS(AE_SUPPORT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185
Bob Mooref3d2e782007-02-02 19:48:18 +0300186 new_size =
187 (acpi_gbl_root_table_list.count +
188 ACPI_ROOT_TABLE_SIZE_INCREMENT) * sizeof(struct acpi_table_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Bob Mooref3d2e782007-02-02 19:48:18 +0300190 /* Create new array and copy the old array */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Bob Mooref3d2e782007-02-02 19:48:18 +0300192 tables = ACPI_ALLOCATE_ZEROED(new_size);
193 if (!tables) {
194 return_ACPI_STATUS(AE_NO_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 }
196
Bob Mooref3d2e782007-02-02 19:48:18 +0300197 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, new_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Bob Mooref3d2e782007-02-02 19:48:18 +0300199 acpi_gbl_root_table_list.size = acpi_gbl_root_table_list.count;
200 acpi_gbl_root_table_list.tables = tables;
201 acpi_gbl_root_table_list.flags =
Bob Moorec5fc42a2007-02-02 19:48:19 +0300202 ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Len Brown4be44fc2005-08-05 00:44:28 -0400204 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205}
Len Brownfd350942007-05-09 23:34:35 -0400206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207/*******************************************************************************
208 *
209 * FUNCTION: acpi_load_table
210 *
211 * PARAMETERS: table_ptr - pointer to a buffer containing the entire
212 * table to be loaded
213 *
214 * RETURN: Status
215 *
216 * DESCRIPTION: This function is called to load a table from the caller's
Bob Mooref6dd9222006-07-07 20:44:38 -0400217 * buffer. The buffer must contain an entire ACPI Table including
218 * a valid header. The header fields will be verified, and if it
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 * is determined that the table is invalid, the call will fail.
220 *
221 ******************************************************************************/
Len Brown4be44fc2005-08-05 00:44:28 -0400222acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
Len Brown4be44fc2005-08-05 00:44:28 -0400224 acpi_status status;
Bob Mooref3d2e782007-02-02 19:48:18 +0300225 acpi_native_uint table_index;
Alexey Starikovskiy428f2112007-02-02 19:48:22 +0300226 struct acpi_table_desc table_desc;
227
228 if (!table_ptr)
229 return AE_BAD_PARAMETER;
230
231 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
232 table_desc.pointer = table_ptr;
233 table_desc.length = table_ptr->length;
234 table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Bob Mooref3d2e782007-02-02 19:48:18 +0300236 /*
237 * Install the new table into the local data structures
238 */
Alexey Starikovskiy428f2112007-02-02 19:48:22 +0300239 status = acpi_tb_add_table(&table_desc, &table_index);
Len Brown4be44fc2005-08-05 00:44:28 -0400240 if (ACPI_FAILURE(status)) {
Alexey Starikovskiy428f2112007-02-02 19:48:22 +0300241 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
Bob Mooref3d2e782007-02-02 19:48:18 +0300243 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
Alexey Starikovskiy428f2112007-02-02 19:48:22 +0300244 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245}
246
Bob Moore83135242006-10-03 00:00:00 -0400247ACPI_EXPORT_SYMBOL(acpi_load_table)
248
Bob Mooref3d2e782007-02-02 19:48:18 +0300249/******************************************************************************
250 *
251 * FUNCTION: acpi_get_table_header
252 *
253 * PARAMETERS: Signature - ACPI signature of needed table
254 * Instance - Which instance (for SSDTs)
Alexey Starikovskiy428f2112007-02-02 19:48:22 +0300255 * out_table_header - The pointer to the table header to fill
Bob Mooref3d2e782007-02-02 19:48:18 +0300256 *
257 * RETURN: Status and pointer to mapped table header
258 *
259 * DESCRIPTION: Finds an ACPI table header.
260 *
261 * NOTE: Caller is responsible in unmapping the header with
262 * acpi_os_unmap_memory
263 *
264 *****************************************************************************/
265acpi_status
266acpi_get_table_header(char *signature,
267 acpi_native_uint instance,
Len Brownfd350942007-05-09 23:34:35 -0400268 struct acpi_table_header * out_table_header)
Bob Mooref3d2e782007-02-02 19:48:18 +0300269{
270 acpi_native_uint i;
271 acpi_native_uint j;
Alexey Starikovskiy428f2112007-02-02 19:48:22 +0300272 struct acpi_table_header *header;
Bob Mooref3d2e782007-02-02 19:48:18 +0300273
Bob Moorec5fc42a2007-02-02 19:48:19 +0300274 /* Parameter validation */
275
276 if (!signature || !out_table_header) {
277 return (AE_BAD_PARAMETER);
278 }
279
Bob Mooref3d2e782007-02-02 19:48:18 +0300280 /*
281 * Walk the root table list
282 */
283 for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
284 if (!ACPI_COMPARE_NAME
285 (&(acpi_gbl_root_table_list.tables[i].signature),
286 signature)) {
287 continue;
288 }
289
290 if (++j < instance) {
291 continue;
292 }
293
Alexey Starikovskiy428f2112007-02-02 19:48:22 +0300294 if (!acpi_gbl_root_table_list.tables[i].pointer) {
295 if ((acpi_gbl_root_table_list.tables[i].
296 flags & ACPI_TABLE_ORIGIN_MASK) ==
297 ACPI_TABLE_ORIGIN_MAPPED) {
298 header =
299 acpi_os_map_memory(acpi_gbl_root_table_list.
300 tables[i].address,
301 sizeof(struct
302 acpi_table_header));
303 if (!header) {
304 return AE_NO_MEMORY;
305 }
306 ACPI_MEMCPY(out_table_header, header,
307 sizeof(struct acpi_table_header));
308 acpi_os_unmap_memory(header,
309 sizeof(struct
310 acpi_table_header));
311 } else {
312 return AE_NOT_FOUND;
313 }
314 } else {
315 ACPI_MEMCPY(out_table_header,
316 acpi_gbl_root_table_list.tables[i].pointer,
317 sizeof(struct acpi_table_header));
Bob Mooref3d2e782007-02-02 19:48:18 +0300318 }
Bob Mooref3d2e782007-02-02 19:48:18 +0300319 return (AE_OK);
320 }
321
322 return (AE_NOT_FOUND);
323}
324
325ACPI_EXPORT_SYMBOL(acpi_get_table_header)
326
Bob Mooref3d2e782007-02-02 19:48:18 +0300327/******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 *
John Keller0f0fe1a2006-12-19 12:56:19 -0800329 * FUNCTION: acpi_unload_table_id
330 *
Bob Mooref3d2e782007-02-02 19:48:18 +0300331 * PARAMETERS: id - Owner ID of the table to be removed.
John Keller0f0fe1a2006-12-19 12:56:19 -0800332 *
333 * RETURN: Status
334 *
335 * DESCRIPTION: This routine is used to force the unload of a table (by id)
336 *
337 ******************************************************************************/
Bob Mooref3d2e782007-02-02 19:48:18 +0300338acpi_status acpi_unload_table_id(acpi_owner_id id)
John Keller0f0fe1a2006-12-19 12:56:19 -0800339{
Bob Mooref3d2e782007-02-02 19:48:18 +0300340 int i;
341 acpi_status status = AE_NOT_EXIST;
John Keller0f0fe1a2006-12-19 12:56:19 -0800342
John Kellerecb5f752007-02-15 14:08:30 -0600343 ACPI_FUNCTION_TRACE(acpi_unload_table_id);
John Keller0f0fe1a2006-12-19 12:56:19 -0800344
John Kellerecb5f752007-02-15 14:08:30 -0600345 /* Find table in the global table list */
Bob Mooref3d2e782007-02-02 19:48:18 +0300346 for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
347 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
348 continue;
349 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 /*
Len Brownfd350942007-05-09 23:34:35 -0400351 * Delete all namespace objects owned by this table. Note that these
352 * objects can appear anywhere in the namespace by virtue of the AML
353 * "Scope" operator. Thus, we need to track ownership by an ID, not
354 * simply a position within the hierarchy
355 */
Bob Mooref3d2e782007-02-02 19:48:18 +0300356 acpi_tb_delete_namespace_by_owner(i);
John Kellerecb5f752007-02-15 14:08:30 -0600357 status = acpi_tb_release_owner_id(i);
Bob Mooref3d2e782007-02-02 19:48:18 +0300358 acpi_tb_set_table_loaded_flag(i, FALSE);
John Kellerecb5f752007-02-15 14:08:30 -0600359 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 }
Len Brown4be44fc2005-08-05 00:44:28 -0400361 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}
363
Bob Mooref3d2e782007-02-02 19:48:18 +0300364ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366/*******************************************************************************
367 *
368 * FUNCTION: acpi_get_table
369 *
Bob Mooref3d2e782007-02-02 19:48:18 +0300370 * PARAMETERS: Signature - ACPI signature of needed table
371 * Instance - Which instance (for SSDTs)
372 * out_table - Where the pointer to the table is returned
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 *
Bob Mooref3d2e782007-02-02 19:48:18 +0300374 * RETURN: Status and pointer to table
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 *
Bob Mooref3d2e782007-02-02 19:48:18 +0300376 * DESCRIPTION: Finds and verifies an ACPI table.
377 *
378 *****************************************************************************/
379acpi_status
380acpi_get_table(char *signature,
Len Brownfd350942007-05-09 23:34:35 -0400381 acpi_native_uint instance, struct acpi_table_header **out_table)
Bob Mooref3d2e782007-02-02 19:48:18 +0300382{
383 acpi_native_uint i;
384 acpi_native_uint j;
385 acpi_status status;
386
Bob Moorec5fc42a2007-02-02 19:48:19 +0300387 /* Parameter validation */
388
389 if (!signature || !out_table) {
390 return (AE_BAD_PARAMETER);
391 }
392
Bob Mooref3d2e782007-02-02 19:48:18 +0300393 /*
394 * Walk the root table list
395 */
396 for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
397 if (!ACPI_COMPARE_NAME
398 (&(acpi_gbl_root_table_list.tables[i].signature),
399 signature)) {
400 continue;
401 }
402
403 if (++j < instance) {
404 continue;
405 }
406
407 status =
408 acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
409 if (ACPI_SUCCESS(status)) {
410 *out_table = acpi_gbl_root_table_list.tables[i].pointer;
411 }
412
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300413 if (!acpi_gbl_permanent_mmap) {
Randy Dunlap70c08462007-02-13 16:11:36 -0800414 acpi_gbl_root_table_list.tables[i].pointer = NULL;
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300415 }
416
Bob Mooref3d2e782007-02-02 19:48:18 +0300417 return (status);
418 }
419
420 return (AE_NOT_FOUND);
421}
422
423ACPI_EXPORT_SYMBOL(acpi_get_table)
424
425/*******************************************************************************
426 *
427 * FUNCTION: acpi_get_table_by_index
428 *
429 * PARAMETERS: table_index - Table index
430 * Table - Where the pointer to the table is returned
431 *
432 * RETURN: Status and pointer to the table
433 *
434 * DESCRIPTION: Obtain a table by an index into the global table list.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 *
436 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437acpi_status
Bob Mooref3d2e782007-02-02 19:48:18 +0300438acpi_get_table_by_index(acpi_native_uint table_index,
439 struct acpi_table_header ** table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440{
Len Brown4be44fc2005-08-05 00:44:28 -0400441 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Bob Mooref3d2e782007-02-02 19:48:18 +0300443 ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Bob Moorec5fc42a2007-02-02 19:48:19 +0300445 /* Parameter validation */
446
447 if (!table) {
448 return_ACPI_STATUS(AE_BAD_PARAMETER);
449 }
450
Bob Mooref3d2e782007-02-02 19:48:18 +0300451 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Bob Mooref3d2e782007-02-02 19:48:18 +0300453 /* Validate index */
454
455 if (table_index >= acpi_gbl_root_table_list.count) {
456 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
Len Brown4be44fc2005-08-05 00:44:28 -0400457 return_ACPI_STATUS(AE_BAD_PARAMETER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 }
459
Bob Mooref3d2e782007-02-02 19:48:18 +0300460 if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
461
462 /* Table is not mapped, map it */
463
464 status =
465 acpi_tb_verify_table(&acpi_gbl_root_table_list.
466 tables[table_index]);
467 if (ACPI_FAILURE(status)) {
468 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
469 return_ACPI_STATUS(status);
470 }
471 }
472
473 *table = acpi_gbl_root_table_list.tables[table_index].pointer;
474 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
475 return_ACPI_STATUS(AE_OK);
476}
477
478ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
479
480/*******************************************************************************
481 *
482 * FUNCTION: acpi_tb_load_namespace
483 *
484 * PARAMETERS: None
485 *
486 * RETURN: Status
487 *
488 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
489 * the RSDT/XSDT.
490 *
491 ******************************************************************************/
492static acpi_status acpi_tb_load_namespace(void)
493{
494 acpi_status status;
495 struct acpi_table_header *table;
496 acpi_native_uint i;
497
498 ACPI_FUNCTION_TRACE(tb_load_namespace);
499
500 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
501
502 /*
503 * Load the namespace. The DSDT is required, but any SSDT and PSDT tables
504 * are optional.
505 */
506 if (!acpi_gbl_root_table_list.count ||
507 !ACPI_COMPARE_NAME(&
508 (acpi_gbl_root_table_list.
509 tables[ACPI_TABLE_INDEX_DSDT].signature),
510 ACPI_SIG_DSDT)
511 ||
512 ACPI_FAILURE(acpi_tb_verify_table
513 (&acpi_gbl_root_table_list.
514 tables[ACPI_TABLE_INDEX_DSDT]))) {
515 status = AE_NO_ACPI_TABLES;
516 goto unlock_and_exit;
517 }
518
519 /*
520 * Find DSDT table
521 */
522 status =
523 acpi_os_table_override(acpi_gbl_root_table_list.
524 tables[ACPI_TABLE_INDEX_DSDT].pointer,
525 &table);
526 if (ACPI_SUCCESS(status) && table) {
527 /*
528 * DSDT table has been found
529 */
Bob Moore035f9942007-02-02 19:48:24 +0300530 acpi_tb_delete_table(&acpi_gbl_root_table_list.
531 tables[ACPI_TABLE_INDEX_DSDT]);
Bob Mooref3d2e782007-02-02 19:48:18 +0300532 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer =
533 table;
534 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].length =
535 table->length;
536 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].flags =
537 ACPI_TABLE_ORIGIN_UNKNOWN;
538
539 ACPI_INFO((AE_INFO, "Table DSDT replaced by host OS"));
540 acpi_tb_print_table_header(0, table);
Len Brown67effe82007-07-26 00:50:06 -0400541
542 if (no_auto_ssdt == 0) {
Alistair John Strachanc21d1e72008-05-12 19:13:09 +0100543 printk(KERN_WARNING "ACPI: DSDT override uses original SSDTs unless \"acpi_no_auto_ssdt\"\n");
Len Brown67effe82007-07-26 00:50:06 -0400544 }
Bob Mooref3d2e782007-02-02 19:48:18 +0300545 }
546
547 status =
548 acpi_tb_verify_table(&acpi_gbl_root_table_list.
549 tables[ACPI_TABLE_INDEX_DSDT]);
Len Brown4be44fc2005-08-05 00:44:28 -0400550 if (ACPI_FAILURE(status)) {
Bob Mooref3d2e782007-02-02 19:48:18 +0300551
552 /* A valid DSDT is required */
553
554 status = AE_NO_ACPI_TABLES;
555 goto unlock_and_exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 }
557
Bob Mooref3d2e782007-02-02 19:48:18 +0300558 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Bob Mooref3d2e782007-02-02 19:48:18 +0300560 /*
561 * Load and parse tables.
562 */
563 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
Len Brown4be44fc2005-08-05 00:44:28 -0400564 if (ACPI_FAILURE(status)) {
565 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 }
567
568 /*
Bob Mooref3d2e782007-02-02 19:48:18 +0300569 * Load any SSDT or PSDT tables. Note: Loop leaves tables locked
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 */
Bob Mooref3d2e782007-02-02 19:48:18 +0300571 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
572 for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
573 if ((!ACPI_COMPARE_NAME
574 (&(acpi_gbl_root_table_list.tables[i].signature),
575 ACPI_SIG_SSDT)
576 &&
577 !ACPI_COMPARE_NAME(&
578 (acpi_gbl_root_table_list.tables[i].
579 signature), ACPI_SIG_PSDT))
580 ||
581 ACPI_FAILURE(acpi_tb_verify_table
582 (&acpi_gbl_root_table_list.tables[i]))) {
583 continue;
584 }
585
Len Brown67effe82007-07-26 00:50:06 -0400586 if (no_auto_ssdt) {
587 printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
588 continue;
589 }
590
Bob Mooref3d2e782007-02-02 19:48:18 +0300591 /* Ignore errors while loading tables, get as many as possible */
592
593 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
594 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
595 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 }
597
Bob Mooref3d2e782007-02-02 19:48:18 +0300598 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Bob Mooref3d2e782007-02-02 19:48:18 +0300600 unlock_and_exit:
601 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
602 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Bob Mooref3d2e782007-02-02 19:48:18 +0300605/*******************************************************************************
606 *
607 * FUNCTION: acpi_load_tables
608 *
609 * PARAMETERS: None
610 *
611 * RETURN: Status
612 *
613 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
614 *
615 ******************************************************************************/
616
617acpi_status acpi_load_tables(void)
618{
619 acpi_status status;
620
621 ACPI_FUNCTION_TRACE(acpi_load_tables);
622
623 /*
624 * Load the namespace from the tables
625 */
626 status = acpi_tb_load_namespace();
627 if (ACPI_FAILURE(status)) {
628 ACPI_EXCEPTION((AE_INFO, status,
629 "While loading namespace from ACPI tables"));
630 }
631
632 return_ACPI_STATUS(status);
633}
634
635ACPI_EXPORT_SYMBOL(acpi_load_tables)
Len Brown67effe82007-07-26 00:50:06 -0400636
637
Lin Ming3e08e2d2008-04-10 19:06:38 +0400638/*******************************************************************************
639 *
640 * FUNCTION: acpi_install_table_handler
641 *
642 * PARAMETERS: Handler - Table event handler
643 * Context - Value passed to the handler on each event
644 *
645 * RETURN: Status
646 *
647 * DESCRIPTION: Install table event handler
648 *
649 ******************************************************************************/
650acpi_status
651acpi_install_table_handler(acpi_tbl_handler handler, void *context)
652{
653 acpi_status status;
654
655 ACPI_FUNCTION_TRACE(acpi_install_table_handler);
656
657 if (!handler) {
658 return_ACPI_STATUS(AE_BAD_PARAMETER);
659 }
660
661 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
662 if (ACPI_FAILURE(status)) {
663 return_ACPI_STATUS(status);
664 }
665
666 /* Don't allow more than one handler */
667
668 if (acpi_gbl_table_handler) {
669 status = AE_ALREADY_EXISTS;
670 goto cleanup;
671 }
672
673 /* Install the handler */
674
675 acpi_gbl_table_handler = handler;
676 acpi_gbl_table_handler_context = context;
677
678 cleanup:
679 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
680 return_ACPI_STATUS(status);
681}
682
683ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
684
685/*******************************************************************************
686 *
687 * FUNCTION: acpi_remove_table_handler
688 *
689 * PARAMETERS: Handler - Table event handler that was installed
690 * previously.
691 *
692 * RETURN: Status
693 *
694 * DESCRIPTION: Remove table event handler
695 *
696 ******************************************************************************/
697acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
698{
699 acpi_status status;
700
701 ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
702
703 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
704 if (ACPI_FAILURE(status)) {
705 return_ACPI_STATUS(status);
706 }
707
708 /* Make sure that the installed handler is the same */
709
710 if (!handler || handler != acpi_gbl_table_handler) {
711 status = AE_BAD_PARAMETER;
712 goto cleanup;
713 }
714
715 /* Remove the handler */
716
717 acpi_gbl_table_handler = NULL;
718
719 cleanup:
720 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
721 return_ACPI_STATUS(status);
722}
723
724ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
725
726
Len Brown67effe82007-07-26 00:50:06 -0400727static int __init acpi_no_auto_ssdt_setup(char *s) {
728
729 printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
730
731 no_auto_ssdt = 1;
732
733 return 1;
734}
735
736__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);