1 /******************************************************************************
3 * Module Name: tbxface - ACPI table-oriented external interfaces
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2013, Intel Corp.
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20 * including a substantially similar Disclaimer requirement for further
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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44 #include <linux/export.h>
45 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_TABLES
50 ACPI_MODULE_NAME("tbxface")
52 /*******************************************************************************
54 * FUNCTION: acpi_allocate_root_table
56 * PARAMETERS: initial_table_count - Size of initial_table_array, in number of
57 * struct acpi_table_desc structures
61 * DESCRIPTION: Allocate a root table array. Used by iASL compiler and
62 * acpi_initialize_tables.
64 ******************************************************************************/
65 acpi_status
acpi_allocate_root_table(u32 initial_table_count
)
68 acpi_gbl_root_table_list
.max_table_count
= initial_table_count
;
69 acpi_gbl_root_table_list
.flags
= ACPI_ROOT_ALLOW_RESIZE
;
71 return (acpi_tb_resize_root_table_list());
74 /*******************************************************************************
76 * FUNCTION: acpi_initialize_tables
78 * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
79 * struct acpi_table_desc structures. If NULL, the
80 * array is dynamically allocated.
81 * initial_table_count - Size of initial_table_array, in number of
82 * struct acpi_table_desc structures
83 * allow_resize - Flag to tell Table Manager if resize of
84 * pre-allocated array is allowed. Ignored
85 * if initial_table_array is NULL.
89 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
91 * NOTE: Allows static allocation of the initial table array in order
92 * to avoid the use of dynamic memory in confined environments
93 * such as the kernel boot sequence where it may not be available.
95 * If the host OS memory managers are initialized, use NULL for
96 * initial_table_array, and the table will be dynamically allocated.
98 ******************************************************************************/
101 acpi_initialize_tables(struct acpi_table_desc
* initial_table_array
,
102 u32 initial_table_count
, u8 allow_resize
)
104 acpi_physical_address rsdp_address
;
107 ACPI_FUNCTION_TRACE(acpi_initialize_tables
);
110 * Setup the Root Table Array and allocate the table array
113 if (!initial_table_array
) {
114 status
= acpi_allocate_root_table(initial_table_count
);
115 if (ACPI_FAILURE(status
)) {
116 return_ACPI_STATUS(status
);
119 /* Root Table Array has been statically allocated by the host */
121 ACPI_MEMSET(initial_table_array
, 0,
122 (acpi_size
) initial_table_count
*
123 sizeof(struct acpi_table_desc
));
125 acpi_gbl_root_table_list
.tables
= initial_table_array
;
126 acpi_gbl_root_table_list
.max_table_count
= initial_table_count
;
127 acpi_gbl_root_table_list
.flags
= ACPI_ROOT_ORIGIN_UNKNOWN
;
129 acpi_gbl_root_table_list
.flags
|=
130 ACPI_ROOT_ALLOW_RESIZE
;
134 /* Get the address of the RSDP */
136 rsdp_address
= acpi_os_get_root_pointer();
138 return_ACPI_STATUS(AE_NOT_FOUND
);
142 * Get the root table (RSDT or XSDT) and extract all entries to the local
143 * Root Table Array. This array contains the information of the RSDT/XSDT
144 * in a common, more useable format.
146 status
= acpi_tb_parse_root_table(rsdp_address
);
147 return_ACPI_STATUS(status
);
150 /*******************************************************************************
152 * FUNCTION: acpi_reallocate_root_table
158 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
159 * root list from the previously provided scratch area. Should
160 * be called once dynamic memory allocation is available in the
163 ******************************************************************************/
164 acpi_status
acpi_reallocate_root_table(void)
168 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table
);
171 * Only reallocate the root table if the host provided a static buffer
172 * for the table array in the call to acpi_initialize_tables.
174 if (acpi_gbl_root_table_list
.flags
& ACPI_ROOT_ORIGIN_ALLOCATED
) {
175 return_ACPI_STATUS(AE_SUPPORT
);
178 acpi_gbl_root_table_list
.flags
|= ACPI_ROOT_ALLOW_RESIZE
;
180 status
= acpi_tb_resize_root_table_list();
181 return_ACPI_STATUS(status
);
184 /*******************************************************************************
186 * FUNCTION: acpi_get_table_header
188 * PARAMETERS: signature - ACPI signature of needed table
189 * instance - Which instance (for SSDTs)
190 * out_table_header - The pointer to the table header to fill
192 * RETURN: Status and pointer to mapped table header
194 * DESCRIPTION: Finds an ACPI table header.
196 * NOTE: Caller is responsible in unmapping the header with
197 * acpi_os_unmap_memory
199 ******************************************************************************/
201 acpi_get_table_header(char *signature
,
202 u32 instance
, struct acpi_table_header
*out_table_header
)
206 struct acpi_table_header
*header
;
208 /* Parameter validation */
210 if (!signature
|| !out_table_header
) {
211 return (AE_BAD_PARAMETER
);
214 /* Walk the root table list */
216 for (i
= 0, j
= 0; i
< acpi_gbl_root_table_list
.current_table_count
;
218 if (!ACPI_COMPARE_NAME
219 (&(acpi_gbl_root_table_list
.tables
[i
].signature
),
224 if (++j
< instance
) {
228 if (!acpi_gbl_root_table_list
.tables
[i
].pointer
) {
229 if ((acpi_gbl_root_table_list
.tables
[i
].flags
&
230 ACPI_TABLE_ORIGIN_MASK
) ==
231 ACPI_TABLE_ORIGIN_MAPPED
) {
233 acpi_os_map_memory(acpi_gbl_root_table_list
.
238 return (AE_NO_MEMORY
);
240 ACPI_MEMCPY(out_table_header
, header
,
241 sizeof(struct acpi_table_header
));
242 acpi_os_unmap_memory(header
,
246 return (AE_NOT_FOUND
);
249 ACPI_MEMCPY(out_table_header
,
250 acpi_gbl_root_table_list
.tables
[i
].pointer
,
251 sizeof(struct acpi_table_header
));
256 return (AE_NOT_FOUND
);
259 ACPI_EXPORT_SYMBOL(acpi_get_table_header
)
261 /*******************************************************************************
263 * FUNCTION: acpi_unload_table_id
265 * PARAMETERS: id - Owner ID of the table to be removed.
269 * DESCRIPTION: This routine is used to force the unload of a table (by id)
271 ******************************************************************************/
272 acpi_status
acpi_unload_table_id(acpi_owner_id id
)
275 acpi_status status
= AE_NOT_EXIST
;
277 ACPI_FUNCTION_TRACE(acpi_unload_table_id
);
279 /* Find table in the global table list */
280 for (i
= 0; i
< acpi_gbl_root_table_list
.current_table_count
; ++i
) {
281 if (id
!= acpi_gbl_root_table_list
.tables
[i
].owner_id
) {
285 * Delete all namespace objects owned by this table. Note that these
286 * objects can appear anywhere in the namespace by virtue of the AML
287 * "Scope" operator. Thus, we need to track ownership by an ID, not
288 * simply a position within the hierarchy
290 acpi_tb_delete_namespace_by_owner(i
);
291 status
= acpi_tb_release_owner_id(i
);
292 acpi_tb_set_table_loaded_flag(i
, FALSE
);
295 return_ACPI_STATUS(status
);
298 ACPI_EXPORT_SYMBOL(acpi_unload_table_id
)
300 /*******************************************************************************
302 * FUNCTION: acpi_get_table_with_size
304 * PARAMETERS: signature - ACPI signature of needed table
305 * instance - Which instance (for SSDTs)
306 * out_table - Where the pointer to the table is returned
308 * RETURN: Status and pointer to the requested table
310 * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
313 ******************************************************************************/
315 acpi_get_table_with_size(char *signature
,
316 u32 instance
, struct acpi_table_header
**out_table
,
323 /* Parameter validation */
325 if (!signature
|| !out_table
) {
326 return (AE_BAD_PARAMETER
);
329 /* Walk the root table list */
331 for (i
= 0, j
= 0; i
< acpi_gbl_root_table_list
.current_table_count
;
333 if (!ACPI_COMPARE_NAME
334 (&(acpi_gbl_root_table_list
.tables
[i
].signature
),
339 if (++j
< instance
) {
344 acpi_tb_verify_table(&acpi_gbl_root_table_list
.tables
[i
]);
345 if (ACPI_SUCCESS(status
)) {
346 *out_table
= acpi_gbl_root_table_list
.tables
[i
].pointer
;
347 *tbl_size
= acpi_gbl_root_table_list
.tables
[i
].length
;
350 if (!acpi_gbl_permanent_mmap
) {
351 acpi_gbl_root_table_list
.tables
[i
].pointer
= NULL
;
357 return (AE_NOT_FOUND
);
359 ACPI_EXPORT_SYMBOL(acpi_get_table_with_size
)
362 acpi_get_table(char *signature
,
363 u32 instance
, struct acpi_table_header
**out_table
)
367 return acpi_get_table_with_size(signature
,
368 instance
, out_table
, &tbl_size
);
370 ACPI_EXPORT_SYMBOL(acpi_get_table
)
372 /*******************************************************************************
374 * FUNCTION: acpi_get_table_by_index
376 * PARAMETERS: table_index - Table index
377 * table - Where the pointer to the table is returned
379 * RETURN: Status and pointer to the requested table
381 * DESCRIPTION: Obtain a table by an index into the global table list. Used
384 ******************************************************************************/
386 acpi_get_table_by_index(u32 table_index
, struct acpi_table_header
**table
)
390 ACPI_FUNCTION_TRACE(acpi_get_table_by_index
);
392 /* Parameter validation */
395 return_ACPI_STATUS(AE_BAD_PARAMETER
);
398 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES
);
402 if (table_index
>= acpi_gbl_root_table_list
.current_table_count
) {
403 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES
);
404 return_ACPI_STATUS(AE_BAD_PARAMETER
);
407 if (!acpi_gbl_root_table_list
.tables
[table_index
].pointer
) {
409 /* Table is not mapped, map it */
412 acpi_tb_verify_table(&acpi_gbl_root_table_list
.
413 tables
[table_index
]);
414 if (ACPI_FAILURE(status
)) {
415 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES
);
416 return_ACPI_STATUS(status
);
420 *table
= acpi_gbl_root_table_list
.tables
[table_index
].pointer
;
421 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES
);
422 return_ACPI_STATUS(AE_OK
);
425 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index
)
428 /*******************************************************************************
430 * FUNCTION: acpi_install_table_handler
432 * PARAMETERS: handler - Table event handler
433 * context - Value passed to the handler on each event
437 * DESCRIPTION: Install a global table event handler.
439 ******************************************************************************/
441 acpi_install_table_handler(acpi_table_handler handler
, void *context
)
445 ACPI_FUNCTION_TRACE(acpi_install_table_handler
);
448 return_ACPI_STATUS(AE_BAD_PARAMETER
);
451 status
= acpi_ut_acquire_mutex(ACPI_MTX_EVENTS
);
452 if (ACPI_FAILURE(status
)) {
453 return_ACPI_STATUS(status
);
456 /* Don't allow more than one handler */
458 if (acpi_gbl_table_handler
) {
459 status
= AE_ALREADY_EXISTS
;
463 /* Install the handler */
465 acpi_gbl_table_handler
= handler
;
466 acpi_gbl_table_handler_context
= context
;
469 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS
);
470 return_ACPI_STATUS(status
);
473 ACPI_EXPORT_SYMBOL(acpi_install_table_handler
)
475 /*******************************************************************************
477 * FUNCTION: acpi_remove_table_handler
479 * PARAMETERS: handler - Table event handler that was installed
484 * DESCRIPTION: Remove a table event handler
486 ******************************************************************************/
487 acpi_status
acpi_remove_table_handler(acpi_table_handler handler
)
491 ACPI_FUNCTION_TRACE(acpi_remove_table_handler
);
493 status
= acpi_ut_acquire_mutex(ACPI_MTX_EVENTS
);
494 if (ACPI_FAILURE(status
)) {
495 return_ACPI_STATUS(status
);
498 /* Make sure that the installed handler is the same */
500 if (!handler
|| handler
!= acpi_gbl_table_handler
) {
501 status
= AE_BAD_PARAMETER
;
505 /* Remove the handler */
507 acpi_gbl_table_handler
= NULL
;
510 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS
);
511 return_ACPI_STATUS(status
);
514 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler
)