1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: tbxfload - Table load/unload external interfaces
5 *
6 * Copyright (C) 2000 - 2018, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #define EXPORT_ACPI_INTERFACES
11
12 #include <acpi/acpi.h>
13 #include "accommon.h"
14 #include "acnamesp.h"
15 #include "actables.h"
16 #include "acevents.h"
17
18 #define _COMPONENT ACPI_TABLES
19 ACPI_MODULE_NAME("tbxfload")
20
21 /*******************************************************************************
22 *
23 * FUNCTION: acpi_load_tables
24 *
25 * PARAMETERS: None
26 *
27 * RETURN: Status
28 *
29 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
30 *
31 ******************************************************************************/
acpi_load_tables(void)32 acpi_status ACPI_INIT_FUNCTION acpi_load_tables(void)
33 {
34 acpi_status status;
35
36 ACPI_FUNCTION_TRACE(acpi_load_tables);
37
38 /*
39 * Install the default operation region handlers. These are the
40 * handlers that are defined by the ACPI specification to be
41 * "always accessible" -- namely, system_memory, system_IO, and
42 * PCI_Config. This also means that no _REG methods need to be
43 * run for these address spaces. We need to have these handlers
44 * installed before any AML code can be executed, especially any
45 * module-level code (11/2015).
46 * Note that we allow OSPMs to install their own region handlers
47 * between acpi_initialize_subsystem() and acpi_load_tables() to use
48 * their customized default region handlers.
49 */
50 status = acpi_ev_install_region_handlers();
51 if (ACPI_FAILURE(status)) {
52 ACPI_EXCEPTION((AE_INFO, status,
53 "During Region initialization"));
54 return_ACPI_STATUS(status);
55 }
56
57 /* Load the namespace from the tables */
58
59 status = acpi_tb_load_namespace();
60
61 /* Don't let single failures abort the load */
62
63 if (status == AE_CTRL_TERMINATE) {
64 status = AE_OK;
65 }
66
67 if (ACPI_FAILURE(status)) {
68 ACPI_EXCEPTION((AE_INFO, status,
69 "While loading namespace from ACPI tables"));
70 }
71
72 if (acpi_gbl_execute_tables_as_methods
73 || !acpi_gbl_group_module_level_code) {
74 /*
75 * If the module-level code support is enabled, initialize the objects
76 * in the namespace that remain uninitialized. This runs the executable
77 * AML that may be part of the declaration of these name objects:
78 * operation_regions, buffer_fields, Buffers, and Packages.
79 *
80 * Note: The module-level code is optional at this time, but will
81 * become the default in the future.
82 */
83 status = acpi_ns_initialize_objects();
84 if (ACPI_FAILURE(status)) {
85 return_ACPI_STATUS(status);
86 }
87 }
88
89 acpi_gbl_namespace_initialized = TRUE;
90 return_ACPI_STATUS(status);
91 }
92
ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)93 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
94
95 /*******************************************************************************
96 *
97 * FUNCTION: acpi_tb_load_namespace
98 *
99 * PARAMETERS: None
100 *
101 * RETURN: Status
102 *
103 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
104 * the RSDT/XSDT.
105 *
106 ******************************************************************************/
107 acpi_status acpi_tb_load_namespace(void)
108 {
109 acpi_status status;
110 u32 i;
111 struct acpi_table_header *new_dsdt;
112 struct acpi_table_desc *table;
113 u32 tables_loaded = 0;
114 u32 tables_failed = 0;
115
116 ACPI_FUNCTION_TRACE(tb_load_namespace);
117
118 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
119
120 /*
121 * Load the namespace. The DSDT is required, but any SSDT and
122 * PSDT tables are optional. Verify the DSDT.
123 */
124 table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index];
125
126 if (!acpi_gbl_root_table_list.current_table_count ||
127 !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) ||
128 ACPI_FAILURE(acpi_tb_validate_table(table))) {
129 status = AE_NO_ACPI_TABLES;
130 goto unlock_and_exit;
131 }
132
133 /*
134 * Save the DSDT pointer for simple access. This is the mapped memory
135 * address. We must take care here because the address of the .Tables
136 * array can change dynamically as tables are loaded at run-time. Note:
137 * .Pointer field is not validated until after call to acpi_tb_validate_table.
138 */
139 acpi_gbl_DSDT = table->pointer;
140
141 /*
142 * Optionally copy the entire DSDT to local memory (instead of simply
143 * mapping it.) There are some BIOSs that corrupt or replace the original
144 * DSDT, creating the need for this option. Default is FALSE, do not copy
145 * the DSDT.
146 */
147 if (acpi_gbl_copy_dsdt_locally) {
148 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index);
149 if (new_dsdt) {
150 acpi_gbl_DSDT = new_dsdt;
151 }
152 }
153
154 /*
155 * Save the original DSDT header for detection of table corruption
156 * and/or replacement of the DSDT from outside the OS.
157 */
158 memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
159 sizeof(struct acpi_table_header));
160
161 /* Load and parse tables */
162
163 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
164 status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node);
165 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
166 if (ACPI_FAILURE(status)) {
167 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed"));
168 tables_failed++;
169 } else {
170 tables_loaded++;
171 }
172
173 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
174
175 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
176 table = &acpi_gbl_root_table_list.tables[i];
177
178 if (!table->address ||
179 (!ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_SSDT)
180 && !ACPI_COMPARE_NAME(table->signature.ascii,
181 ACPI_SIG_PSDT)
182 && !ACPI_COMPARE_NAME(table->signature.ascii,
183 ACPI_SIG_OSDT))
184 || ACPI_FAILURE(acpi_tb_validate_table(table))) {
185 continue;
186 }
187
188 /* Ignore errors while loading tables, get as many as possible */
189
190 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
191 status = acpi_ns_load_table(i, acpi_gbl_root_node);
192 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
193 if (ACPI_FAILURE(status)) {
194 ACPI_EXCEPTION((AE_INFO, status,
195 "(%4.4s:%8.8s) while loading table",
196 table->signature.ascii,
197 table->pointer->oem_table_id));
198
199 tables_failed++;
200
201 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
202 "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n",
203 table->signature.ascii,
204 table->pointer->oem_table_id));
205 } else {
206 tables_loaded++;
207 }
208 }
209
210 if (!tables_failed) {
211 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded", tables_loaded));
212 } else {
213 ACPI_ERROR((AE_INFO,
214 "%u table load failures, %u successful",
215 tables_failed, tables_loaded));
216
217 /* Indicate at least one failure */
218
219 status = AE_CTRL_TERMINATE;
220 }
221
222 #ifdef ACPI_APPLICATION
223 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\n"));
224 #endif
225
226 unlock_and_exit:
227 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
228 return_ACPI_STATUS(status);
229 }
230
231 /*******************************************************************************
232 *
233 * FUNCTION: acpi_install_table
234 *
235 * PARAMETERS: address - Address of the ACPI table to be installed.
236 * physical - Whether the address is a physical table
237 * address or not
238 *
239 * RETURN: Status
240 *
241 * DESCRIPTION: Dynamically install an ACPI table.
242 * Note: This function should only be invoked after
243 * acpi_initialize_tables() and before acpi_load_tables().
244 *
245 ******************************************************************************/
246
247 acpi_status ACPI_INIT_FUNCTION
acpi_install_table(acpi_physical_address address,u8 physical)248 acpi_install_table(acpi_physical_address address, u8 physical)
249 {
250 acpi_status status;
251 u8 flags;
252 u32 table_index;
253
254 ACPI_FUNCTION_TRACE(acpi_install_table);
255
256 if (physical) {
257 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
258 } else {
259 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
260 }
261
262 status = acpi_tb_install_standard_table(address, flags,
263 FALSE, FALSE, &table_index);
264
265 return_ACPI_STATUS(status);
266 }
267
ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)268 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
269
270 /*******************************************************************************
271 *
272 * FUNCTION: acpi_load_table
273 *
274 * PARAMETERS: table - Pointer to a buffer containing the ACPI
275 * table to be loaded.
276 *
277 * RETURN: Status
278 *
279 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
280 * be a valid ACPI table with a valid ACPI table header.
281 * Note1: Mainly intended to support hotplug addition of SSDTs.
282 * Note2: Does not copy the incoming table. User is responsible
283 * to ensure that the table is not deleted or unmapped.
284 *
285 ******************************************************************************/
286 acpi_status acpi_load_table(struct acpi_table_header *table)
287 {
288 acpi_status status;
289 u32 table_index;
290
291 ACPI_FUNCTION_TRACE(acpi_load_table);
292
293 /* Parameter validation */
294
295 if (!table) {
296 return_ACPI_STATUS(AE_BAD_PARAMETER);
297 }
298
299 /* Install the table and load it into the namespace */
300
301 ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
302 status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
303 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
304 FALSE, &table_index);
305 return_ACPI_STATUS(status);
306 }
307
ACPI_EXPORT_SYMBOL(acpi_load_table)308 ACPI_EXPORT_SYMBOL(acpi_load_table)
309
310 /*******************************************************************************
311 *
312 * FUNCTION: acpi_unload_parent_table
313 *
314 * PARAMETERS: object - Handle to any namespace object owned by
315 * the table to be unloaded
316 *
317 * RETURN: Status
318 *
319 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
320 * the table and deletes all namespace objects associated with
321 * that table. Unloading of the DSDT is not allowed.
322 * Note: Mainly intended to support hotplug removal of SSDTs.
323 *
324 ******************************************************************************/
325 acpi_status acpi_unload_parent_table(acpi_handle object)
326 {
327 struct acpi_namespace_node *node =
328 ACPI_CAST_PTR(struct acpi_namespace_node, object);
329 acpi_status status = AE_NOT_EXIST;
330 acpi_owner_id owner_id;
331 u32 i;
332
333 ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
334
335 /* Parameter validation */
336
337 if (!object) {
338 return_ACPI_STATUS(AE_BAD_PARAMETER);
339 }
340
341 /*
342 * The node owner_id is currently the same as the parent table ID.
343 * However, this could change in the future.
344 */
345 owner_id = node->owner_id;
346 if (!owner_id) {
347
348 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
349
350 return_ACPI_STATUS(AE_TYPE);
351 }
352
353 /* Must acquire the table lock during this operation */
354
355 status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
356 if (ACPI_FAILURE(status)) {
357 return_ACPI_STATUS(status);
358 }
359
360 /* Find the table in the global table list */
361
362 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
363 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
364 continue;
365 }
366
367 /*
368 * Allow unload of SSDT and OEMx tables only. Do not allow unload
369 * of the DSDT. No other types of tables should get here, since
370 * only these types can contain AML and thus are the only types
371 * that can create namespace objects.
372 */
373 if (ACPI_COMPARE_NAME
374 (acpi_gbl_root_table_list.tables[i].signature.ascii,
375 ACPI_SIG_DSDT)) {
376 status = AE_TYPE;
377 break;
378 }
379
380 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
381 status = acpi_tb_unload_table(i);
382 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
383 break;
384 }
385
386 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
387 return_ACPI_STATUS(status);
388 }
389
390 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)
391
