1 /******************************************************************************
3 * Module Name: tbxface - ACPI table-oriented external interfaces
5 *****************************************************************************/
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44 #define EXPORT_ACPI_INTERFACES
46 #include <acpi/acpi.h>
50 #define _COMPONENT ACPI_TABLES
51 ACPI_MODULE_NAME("tbxface")
53 /*******************************************************************************
55 * FUNCTION: acpi_allocate_root_table
57 * PARAMETERS: initial_table_count - Size of initial_table_array, in number of
58 * struct acpi_table_desc structures
62 * DESCRIPTION: Allocate a root table array. Used by iASL compiler and
63 * acpi_initialize_tables.
65 ******************************************************************************/
66 acpi_status acpi_allocate_root_table(u32 initial_table_count)
69 acpi_gbl_root_table_list.max_table_count = initial_table_count;
70 acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
72 return (acpi_tb_resize_root_table_list());
75 /*******************************************************************************
77 * FUNCTION: acpi_initialize_tables
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.
90 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
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.
96 * If the host OS memory managers are initialized, use NULL for
97 * initial_table_array, and the table will be dynamically allocated.
99 ******************************************************************************/
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)
105 acpi_physical_address rsdp_address;
108 ACPI_FUNCTION_TRACE(acpi_initialize_tables);
111 * Setup the Root Table Array and allocate the table array
114 if (!initial_table_array) {
115 status = acpi_allocate_root_table(initial_table_count);
116 if (ACPI_FAILURE(status)) {
117 return_ACPI_STATUS(status);
120 /* Root Table Array has been statically allocated by the host */
122 memset(initial_table_array, 0,
123 (acpi_size)initial_table_count *
124 sizeof(struct acpi_table_desc));
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;
130 acpi_gbl_root_table_list.flags |=
131 ACPI_ROOT_ALLOW_RESIZE;
135 /* Get the address of the RSDP */
137 rsdp_address = acpi_os_get_root_pointer();
139 return_ACPI_STATUS(AE_NOT_FOUND);
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.
147 status = acpi_tb_parse_root_table(rsdp_address);
148 return_ACPI_STATUS(status);
151 ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_tables)
153 /*******************************************************************************
155 * FUNCTION: acpi_reallocate_root_table
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
166 ******************************************************************************/
167 acpi_status ACPI_INIT_FUNCTION acpi_reallocate_root_table(void)
172 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
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.
178 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
179 return_ACPI_STATUS(AE_SUPPORT);
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
188 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
189 if (acpi_gbl_root_table_list.tables[i].pointer) {
191 "Table [%4.4s] is not invalidated during early boot stage",
192 acpi_gbl_root_table_list.tables[i].
197 acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
199 status = acpi_tb_resize_root_table_list();
200 return_ACPI_STATUS(status);
203 ACPI_EXPORT_SYMBOL_INIT(acpi_reallocate_root_table)
205 /*******************************************************************************
207 * FUNCTION: acpi_get_table_header
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
213 * RETURN: Status and pointer to mapped table header
215 * DESCRIPTION: Finds an ACPI table header.
217 * NOTE: Caller is responsible in unmapping the header with
218 * acpi_os_unmap_memory
220 ******************************************************************************/
222 acpi_get_table_header(char *signature,
223 u32 instance, struct acpi_table_header *out_table_header)
227 struct acpi_table_header *header;
229 /* Parameter validation */
231 if (!signature || !out_table_header) {
232 return (AE_BAD_PARAMETER);
235 /* Walk the root table list */
237 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
239 if (!ACPI_COMPARE_NAME
240 (&(acpi_gbl_root_table_list.tables[i].signature),
245 if (++j < instance) {
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) {
254 acpi_os_map_memory(acpi_gbl_root_table_list.
259 return (AE_NO_MEMORY);
262 memcpy(out_table_header, header,
263 sizeof(struct acpi_table_header));
264 acpi_os_unmap_memory(header,
268 return (AE_NOT_FOUND);
271 memcpy(out_table_header,
272 acpi_gbl_root_table_list.tables[i].pointer,
273 sizeof(struct acpi_table_header));
278 return (AE_NOT_FOUND);
281 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
283 /*******************************************************************************
285 * FUNCTION: acpi_get_table
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
291 * RETURN: Status and pointer to the requested table
293 * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
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.
301 ******************************************************************************/
303 acpi_get_table(char *signature,
304 u32 instance, struct acpi_table_header ** out_table)
308 acpi_status status = AE_NOT_FOUND;
309 struct acpi_table_desc *table_desc;
311 /* Parameter validation */
313 if (!signature || !out_table) {
314 return (AE_BAD_PARAMETER);
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.
324 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
326 /* Walk the root table list */
328 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
330 table_desc = &acpi_gbl_root_table_list.tables[i];
332 if (!ACPI_COMPARE_NAME(&table_desc->signature, signature)) {
336 if (++j < instance) {
340 status = acpi_tb_get_table(table_desc, out_table);
344 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
348 ACPI_EXPORT_SYMBOL(acpi_get_table)
350 /*******************************************************************************
352 * FUNCTION: acpi_put_table
354 * PARAMETERS: table - The pointer to the table
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
364 ******************************************************************************/
365 void acpi_put_table(struct acpi_table_header *table)
368 struct acpi_table_desc *table_desc;
370 ACPI_FUNCTION_TRACE(acpi_put_table);
372 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
374 /* Walk the root table list */
376 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
377 table_desc = &acpi_gbl_root_table_list.tables[i];
379 if (table_desc->pointer != table) {
383 acpi_tb_put_table(table_desc);
387 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
391 ACPI_EXPORT_SYMBOL(acpi_put_table)
393 /*******************************************************************************
395 * FUNCTION: acpi_get_table_by_index
397 * PARAMETERS: table_index - Table index
398 * out_table - Where the pointer to the table is returned
400 * RETURN: Status and pointer to the requested table
402 * DESCRIPTION: Obtain a table by an index into the global table list. Used
405 ******************************************************************************/
407 acpi_get_table_by_index(u32 table_index, struct acpi_table_header **out_table)
411 ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
413 /* Parameter validation */
416 return_ACPI_STATUS(AE_BAD_PARAMETER);
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.
426 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
430 if (table_index >= acpi_gbl_root_table_list.current_table_count) {
431 status = AE_BAD_PARAMETER;
432 goto unlock_and_exit;
436 acpi_tb_get_table(&acpi_gbl_root_table_list.tables[table_index],
440 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
441 return_ACPI_STATUS(status);
444 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
446 /*******************************************************************************
448 * FUNCTION: acpi_install_table_handler
450 * PARAMETERS: handler - Table event handler
451 * context - Value passed to the handler on each event
455 * DESCRIPTION: Install a global table event handler.
457 ******************************************************************************/
459 acpi_install_table_handler(acpi_table_handler handler, void *context)
463 ACPI_FUNCTION_TRACE(acpi_install_table_handler);
466 return_ACPI_STATUS(AE_BAD_PARAMETER);
469 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
470 if (ACPI_FAILURE(status)) {
471 return_ACPI_STATUS(status);
474 /* Don't allow more than one handler */
476 if (acpi_gbl_table_handler) {
477 status = AE_ALREADY_EXISTS;
481 /* Install the handler */
483 acpi_gbl_table_handler = handler;
484 acpi_gbl_table_handler_context = context;
487 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
488 return_ACPI_STATUS(status);
491 ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
493 /*******************************************************************************
495 * FUNCTION: acpi_remove_table_handler
497 * PARAMETERS: handler - Table event handler that was installed
502 * DESCRIPTION: Remove a table event handler
504 ******************************************************************************/
505 acpi_status acpi_remove_table_handler(acpi_table_handler handler)
509 ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
511 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
512 if (ACPI_FAILURE(status)) {
513 return_ACPI_STATUS(status);
516 /* Make sure that the installed handler is the same */
518 if (!handler || handler != acpi_gbl_table_handler) {
519 status = AE_BAD_PARAMETER;
523 /* Remove the handler */
525 acpi_gbl_table_handler = NULL;
528 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
529 return_ACPI_STATUS(status);
532 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)