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1/******************************************************************************
2 *
3 * Module Name: tbutils - ACPI Table utilities
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, 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#include <acpi/acpi.h>
45#include "accommon.h"
46#include "actables.h"
47
48#define _COMPONENT ACPI_TABLES
49ACPI_MODULE_NAME("tbutils")
50
51/* Local prototypes */
52static acpi_physical_address
53acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
54
55#if (!ACPI_REDUCED_HARDWARE)
56/*******************************************************************************
57 *
58 * FUNCTION: acpi_tb_initialize_facs
59 *
60 * PARAMETERS: None
61 *
62 * RETURN: Status
63 *
64 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
65 * for accessing the Global Lock and Firmware Waking Vector
66 *
67 ******************************************************************************/
68
69acpi_status acpi_tb_initialize_facs(void)
70{
71 struct acpi_table_facs *facs;
72
73 /* If Hardware Reduced flag is set, there is no FACS */
74
75 if (acpi_gbl_reduced_hardware) {
76 acpi_gbl_FACS = NULL;
77 return (AE_OK);
78 } else if (acpi_gbl_FADT.Xfacs &&
79 (!acpi_gbl_FADT.facs
80 || !acpi_gbl_use32_bit_facs_addresses)) {
81 (void)acpi_get_table_by_index(acpi_gbl_xfacs_index,
82 ACPI_CAST_INDIRECT_PTR(struct
83 acpi_table_header,
84 &facs));
85 acpi_gbl_FACS = facs;
86 } else if (acpi_gbl_FADT.facs) {
87 (void)acpi_get_table_by_index(acpi_gbl_facs_index,
88 ACPI_CAST_INDIRECT_PTR(struct
89 acpi_table_header,
90 &facs));
91 acpi_gbl_FACS = facs;
92 }
93
94 /* If there is no FACS, just continue. There was already an error msg */
95
96 return (AE_OK);
97}
98#endif /* !ACPI_REDUCED_HARDWARE */
99
100/*******************************************************************************
101 *
102 * FUNCTION: acpi_tb_check_dsdt_header
103 *
104 * PARAMETERS: None
105 *
106 * RETURN: None
107 *
108 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
109 * if the DSDT has been replaced from outside the OS and/or if
110 * the DSDT header has been corrupted.
111 *
112 ******************************************************************************/
113
114void acpi_tb_check_dsdt_header(void)
115{
116
117 /* Compare original length and checksum to current values */
118
119 if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length ||
120 acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
121 ACPI_BIOS_ERROR((AE_INFO,
122 "The DSDT has been corrupted or replaced - "
123 "old, new headers below"));
124
125 acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
126 acpi_tb_print_table_header(0, acpi_gbl_DSDT);
127
128 ACPI_ERROR((AE_INFO,
129 "Please send DMI info to linux-acpi@vger.kernel.org\n"
130 "If system does not work as expected, please boot with acpi=copy_dsdt"));
131
132 /* Disable further error messages */
133
134 acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
135 acpi_gbl_original_dsdt_header.checksum =
136 acpi_gbl_DSDT->checksum;
137 }
138}
139
140/*******************************************************************************
141 *
142 * FUNCTION: acpi_tb_copy_dsdt
143 *
144 * PARAMETERS: table_desc - Installed table to copy
145 *
146 * RETURN: None
147 *
148 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
149 * Some very bad BIOSs are known to either corrupt the DSDT or
150 * install a new, bad DSDT. This copy works around the problem.
151 *
152 ******************************************************************************/
153
154struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
155{
156 struct acpi_table_header *new_table;
157 struct acpi_table_desc *table_desc;
158
159 table_desc = &acpi_gbl_root_table_list.tables[table_index];
160
161 new_table = ACPI_ALLOCATE(table_desc->length);
162 if (!new_table) {
163 ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
164 table_desc->length));
165 return (NULL);
166 }
167
168 memcpy(new_table, table_desc->pointer, table_desc->length);
169 acpi_tb_uninstall_table(table_desc);
170
171 acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
172 tables[acpi_gbl_dsdt_index],
173 ACPI_PTR_TO_PHYSADDR(new_table),
174 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
175 new_table);
176
177 ACPI_INFO(("Forced DSDT copy: length 0x%05X copied locally, original unmapped", new_table->length));
178
179 return (new_table);
180}
181
182/*******************************************************************************
183 *
184 * FUNCTION: acpi_tb_get_root_table_entry
185 *
186 * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
187 * table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
188 *
189 * RETURN: Physical address extracted from the root table
190 *
191 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
192 * both 32-bit and 64-bit platforms
193 *
194 * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
195 * 64-bit platforms.
196 *
197 ******************************************************************************/
198
199static acpi_physical_address
200acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
201{
202 u64 address64;
203
204 /*
205 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
206 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
207 */
208 if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) {
209 /*
210 * 32-bit platform, RSDT: Return 32-bit table entry
211 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
212 */
213 return ((acpi_physical_address)
214 (*ACPI_CAST_PTR(u32, table_entry)));
215 } else {
216 /*
217 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
218 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
219 * return 64-bit
220 */
221 ACPI_MOVE_64_TO_64(&address64, table_entry);
222
223#if ACPI_MACHINE_WIDTH == 32
224 if (address64 > ACPI_UINT32_MAX) {
225
226 /* Will truncate 64-bit address to 32 bits, issue warning */
227
228 ACPI_BIOS_WARNING((AE_INFO,
229 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
230 " truncating",
231 ACPI_FORMAT_UINT64(address64)));
232 }
233#endif
234 return ((acpi_physical_address)(address64));
235 }
236}
237
238/*******************************************************************************
239 *
240 * FUNCTION: acpi_tb_parse_root_table
241 *
242 * PARAMETERS: rsdp - Pointer to the RSDP
243 *
244 * RETURN: Status
245 *
246 * DESCRIPTION: This function is called to parse the Root System Description
247 * Table (RSDT or XSDT)
248 *
249 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
250 * be mapped and cannot be copied because it contains the actual
251 * memory location of the ACPI Global Lock.
252 *
253 ******************************************************************************/
254
255acpi_status ACPI_INIT_FUNCTION
256acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
257{
258 struct acpi_table_rsdp *rsdp;
259 u32 table_entry_size;
260 u32 i;
261 u32 table_count;
262 struct acpi_table_header *table;
263 acpi_physical_address address;
264 u32 length;
265 u8 *table_entry;
266 acpi_status status;
267 u32 table_index;
268
269 ACPI_FUNCTION_TRACE(tb_parse_root_table);
270
271 /* Map the entire RSDP and extract the address of the RSDT or XSDT */
272
273 rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
274 if (!rsdp) {
275 return_ACPI_STATUS(AE_NO_MEMORY);
276 }
277
278 acpi_tb_print_table_header(rsdp_address,
279 ACPI_CAST_PTR(struct acpi_table_header,
280 rsdp));
281
282 /* Use XSDT if present and not overridden. Otherwise, use RSDT */
283
284 if ((rsdp->revision > 1) &&
285 rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) {
286 /*
287 * RSDP contains an XSDT (64-bit physical addresses). We must use
288 * the XSDT if the revision is > 1 and the XSDT pointer is present,
289 * as per the ACPI specification.
290 */
291 address = (acpi_physical_address)rsdp->xsdt_physical_address;
292 table_entry_size = ACPI_XSDT_ENTRY_SIZE;
293 } else {
294 /* Root table is an RSDT (32-bit physical addresses) */
295
296 address = (acpi_physical_address)rsdp->rsdt_physical_address;
297 table_entry_size = ACPI_RSDT_ENTRY_SIZE;
298 }
299
300 /*
301 * It is not possible to map more than one entry in some environments,
302 * so unmap the RSDP here before mapping other tables
303 */
304 acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
305
306 /* Map the RSDT/XSDT table header to get the full table length */
307
308 table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
309 if (!table) {
310 return_ACPI_STATUS(AE_NO_MEMORY);
311 }
312
313 acpi_tb_print_table_header(address, table);
314
315 /*
316 * Validate length of the table, and map entire table.
317 * Minimum length table must contain at least one entry.
318 */
319 length = table->length;
320 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
321
322 if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
323 ACPI_BIOS_ERROR((AE_INFO,
324 "Invalid table length 0x%X in RSDT/XSDT",
325 length));
326 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
327 }
328
329 table = acpi_os_map_memory(address, length);
330 if (!table) {
331 return_ACPI_STATUS(AE_NO_MEMORY);
332 }
333
334 /* Validate the root table checksum */
335
336 status = acpi_tb_verify_checksum(table, length);
337 if (ACPI_FAILURE(status)) {
338 acpi_os_unmap_memory(table, length);
339 return_ACPI_STATUS(status);
340 }
341
342 /* Get the number of entries and pointer to first entry */
343
344 table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
345 table_entry_size);
346 table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
347
348 /* Initialize the root table array from the RSDT/XSDT */
349
350 for (i = 0; i < table_count; i++) {
351
352 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
353
354 address =
355 acpi_tb_get_root_table_entry(table_entry, table_entry_size);
356
357 /* Skip NULL entries in RSDT/XSDT */
358
359 if (!address) {
360 goto next_table;
361 }
362
363 status = acpi_tb_install_standard_table(address,
364 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
365 FALSE, TRUE,
366 &table_index);
367
368 if (ACPI_SUCCESS(status) &&
369 ACPI_COMPARE_NAME(&acpi_gbl_root_table_list.
370 tables[table_index].signature,
371 ACPI_SIG_FADT)) {
372 acpi_gbl_fadt_index = table_index;
373 acpi_tb_parse_fadt();
374 }
375
376next_table:
377
378 table_entry += table_entry_size;
379 }
380
381 acpi_os_unmap_memory(table, length);
382 return_ACPI_STATUS(AE_OK);
383}
384
385/*******************************************************************************
386 *
387 * FUNCTION: acpi_tb_get_table
388 *
389 * PARAMETERS: table_desc - Table descriptor
390 * out_table - Where the pointer to the table is returned
391 *
392 * RETURN: Status and pointer to the requested table
393 *
394 * DESCRIPTION: Increase a reference to a table descriptor and return the
395 * validated table pointer.
396 * If the table descriptor is an entry of the root table list,
397 * this API must be invoked with ACPI_MTX_TABLES acquired.
398 *
399 ******************************************************************************/
400
401acpi_status
402acpi_tb_get_table(struct acpi_table_desc *table_desc,
403 struct acpi_table_header **out_table)
404{
405 acpi_status status;
406
407 ACPI_FUNCTION_TRACE(acpi_tb_get_table);
408
409 if (table_desc->validation_count == 0) {
410
411 /* Table need to be "VALIDATED" */
412
413 status = acpi_tb_validate_table(table_desc);
414 if (ACPI_FAILURE(status)) {
415 return_ACPI_STATUS(status);
416 }
417 }
418
419 table_desc->validation_count++;
420 if (table_desc->validation_count == 0) {
421 ACPI_ERROR((AE_INFO,
422 "Table %p, Validation count is zero after increment\n",
423 table_desc));
424 table_desc->validation_count--;
425 return_ACPI_STATUS(AE_LIMIT);
426 }
427
428 *out_table = table_desc->pointer;
429 return_ACPI_STATUS(AE_OK);
430}
431
432/*******************************************************************************
433 *
434 * FUNCTION: acpi_tb_put_table
435 *
436 * PARAMETERS: table_desc - Table descriptor
437 *
438 * RETURN: None
439 *
440 * DESCRIPTION: Decrease a reference to a table descriptor and release the
441 * validated table pointer if no references.
442 * If the table descriptor is an entry of the root table list,
443 * this API must be invoked with ACPI_MTX_TABLES acquired.
444 *
445 ******************************************************************************/
446
447void acpi_tb_put_table(struct acpi_table_desc *table_desc)
448{
449
450 ACPI_FUNCTION_TRACE(acpi_tb_put_table);
451
452 if (table_desc->validation_count == 0) {
453 ACPI_WARNING((AE_INFO,
454 "Table %p, Validation count is zero before decrement\n",
455 table_desc));
456 return_VOID;
457 }
458 table_desc->validation_count--;
459
460 if (table_desc->validation_count == 0) {
461
462 /* Table need to be "INVALIDATED" */
463
464 acpi_tb_invalidate_table(table_desc);
465 }
466
467 return_VOID;
468}
1/******************************************************************************
2 *
3 * Module Name: tbutils - ACPI Table utilities
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, 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#include <acpi/acpi.h>
45#include "accommon.h"
46#include "actables.h"
47
48#define _COMPONENT ACPI_TABLES
49ACPI_MODULE_NAME("tbutils")
50
51/* Local prototypes */
52static acpi_physical_address
53acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
54
55#if (!ACPI_REDUCED_HARDWARE)
56/*******************************************************************************
57 *
58 * FUNCTION: acpi_tb_initialize_facs
59 *
60 * PARAMETERS: None
61 *
62 * RETURN: Status
63 *
64 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
65 * for accessing the Global Lock and Firmware Waking Vector
66 *
67 ******************************************************************************/
68
69acpi_status acpi_tb_initialize_facs(void)
70{
71 struct acpi_table_facs *facs;
72
73 /* If Hardware Reduced flag is set, there is no FACS */
74
75 if (acpi_gbl_reduced_hardware) {
76 acpi_gbl_FACS = NULL;
77 return (AE_OK);
78 } else if (acpi_gbl_FADT.Xfacs &&
79 (!acpi_gbl_FADT.facs
80 || !acpi_gbl_use32_bit_facs_addresses)) {
81 (void)acpi_get_table_by_index(acpi_gbl_xfacs_index,
82 ACPI_CAST_INDIRECT_PTR(struct
83 acpi_table_header,
84 &facs));
85 acpi_gbl_FACS = facs;
86 } else if (acpi_gbl_FADT.facs) {
87 (void)acpi_get_table_by_index(acpi_gbl_facs_index,
88 ACPI_CAST_INDIRECT_PTR(struct
89 acpi_table_header,
90 &facs));
91 acpi_gbl_FACS = facs;
92 }
93
94 /* If there is no FACS, just continue. There was already an error msg */
95
96 return (AE_OK);
97}
98#endif /* !ACPI_REDUCED_HARDWARE */
99
100/*******************************************************************************
101 *
102 * FUNCTION: acpi_tb_check_dsdt_header
103 *
104 * PARAMETERS: None
105 *
106 * RETURN: None
107 *
108 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
109 * if the DSDT has been replaced from outside the OS and/or if
110 * the DSDT header has been corrupted.
111 *
112 ******************************************************************************/
113
114void acpi_tb_check_dsdt_header(void)
115{
116
117 /* Compare original length and checksum to current values */
118
119 if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length ||
120 acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
121 ACPI_BIOS_ERROR((AE_INFO,
122 "The DSDT has been corrupted or replaced - "
123 "old, new headers below"));
124
125 acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
126 acpi_tb_print_table_header(0, acpi_gbl_DSDT);
127
128 ACPI_ERROR((AE_INFO,
129 "Please send DMI info to linux-acpi@vger.kernel.org\n"
130 "If system does not work as expected, please boot with acpi=copy_dsdt"));
131
132 /* Disable further error messages */
133
134 acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
135 acpi_gbl_original_dsdt_header.checksum =
136 acpi_gbl_DSDT->checksum;
137 }
138}
139
140/*******************************************************************************
141 *
142 * FUNCTION: acpi_tb_copy_dsdt
143 *
144 * PARAMETERS: table_desc - Installed table to copy
145 *
146 * RETURN: None
147 *
148 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
149 * Some very bad BIOSs are known to either corrupt the DSDT or
150 * install a new, bad DSDT. This copy works around the problem.
151 *
152 ******************************************************************************/
153
154struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
155{
156 struct acpi_table_header *new_table;
157 struct acpi_table_desc *table_desc;
158
159 table_desc = &acpi_gbl_root_table_list.tables[table_index];
160
161 new_table = ACPI_ALLOCATE(table_desc->length);
162 if (!new_table) {
163 ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
164 table_desc->length));
165 return (NULL);
166 }
167
168 memcpy(new_table, table_desc->pointer, table_desc->length);
169 acpi_tb_uninstall_table(table_desc);
170
171 acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
172 tables[acpi_gbl_dsdt_index],
173 ACPI_PTR_TO_PHYSADDR(new_table),
174 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
175 new_table);
176
177 ACPI_INFO(("Forced DSDT copy: length 0x%05X copied locally, original unmapped", new_table->length));
178
179 return (new_table);
180}
181
182/*******************************************************************************
183 *
184 * FUNCTION: acpi_tb_get_root_table_entry
185 *
186 * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
187 * table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
188 *
189 * RETURN: Physical address extracted from the root table
190 *
191 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
192 * both 32-bit and 64-bit platforms
193 *
194 * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
195 * 64-bit platforms.
196 *
197 ******************************************************************************/
198
199static acpi_physical_address
200acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
201{
202 u64 address64;
203
204 /*
205 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
206 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
207 */
208 if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) {
209 /*
210 * 32-bit platform, RSDT: Return 32-bit table entry
211 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
212 */
213 return ((acpi_physical_address)
214 (*ACPI_CAST_PTR(u32, table_entry)));
215 } else {
216 /*
217 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
218 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
219 * return 64-bit
220 */
221 ACPI_MOVE_64_TO_64(&address64, table_entry);
222
223#if ACPI_MACHINE_WIDTH == 32
224 if (address64 > ACPI_UINT32_MAX) {
225
226 /* Will truncate 64-bit address to 32 bits, issue warning */
227
228 ACPI_BIOS_WARNING((AE_INFO,
229 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
230 " truncating",
231 ACPI_FORMAT_UINT64(address64)));
232 }
233#endif
234 return ((acpi_physical_address) (address64));
235 }
236}
237
238/*******************************************************************************
239 *
240 * FUNCTION: acpi_tb_parse_root_table
241 *
242 * PARAMETERS: rsdp - Pointer to the RSDP
243 *
244 * RETURN: Status
245 *
246 * DESCRIPTION: This function is called to parse the Root System Description
247 * Table (RSDT or XSDT)
248 *
249 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
250 * be mapped and cannot be copied because it contains the actual
251 * memory location of the ACPI Global Lock.
252 *
253 ******************************************************************************/
254
255acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
256{
257 struct acpi_table_rsdp *rsdp;
258 u32 table_entry_size;
259 u32 i;
260 u32 table_count;
261 struct acpi_table_header *table;
262 acpi_physical_address address;
263 u32 length;
264 u8 *table_entry;
265 acpi_status status;
266 u32 table_index;
267
268 ACPI_FUNCTION_TRACE(tb_parse_root_table);
269
270 /* Map the entire RSDP and extract the address of the RSDT or XSDT */
271
272 rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
273 if (!rsdp) {
274 return_ACPI_STATUS(AE_NO_MEMORY);
275 }
276
277 acpi_tb_print_table_header(rsdp_address,
278 ACPI_CAST_PTR(struct acpi_table_header,
279 rsdp));
280
281 /* Use XSDT if present and not overridden. Otherwise, use RSDT */
282
283 if ((rsdp->revision > 1) &&
284 rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) {
285 /*
286 * RSDP contains an XSDT (64-bit physical addresses). We must use
287 * the XSDT if the revision is > 1 and the XSDT pointer is present,
288 * as per the ACPI specification.
289 */
290 address = (acpi_physical_address) rsdp->xsdt_physical_address;
291 table_entry_size = ACPI_XSDT_ENTRY_SIZE;
292 } else {
293 /* Root table is an RSDT (32-bit physical addresses) */
294
295 address = (acpi_physical_address) rsdp->rsdt_physical_address;
296 table_entry_size = ACPI_RSDT_ENTRY_SIZE;
297 }
298
299 /*
300 * It is not possible to map more than one entry in some environments,
301 * so unmap the RSDP here before mapping other tables
302 */
303 acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
304
305 /* Map the RSDT/XSDT table header to get the full table length */
306
307 table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
308 if (!table) {
309 return_ACPI_STATUS(AE_NO_MEMORY);
310 }
311
312 acpi_tb_print_table_header(address, table);
313
314 /*
315 * Validate length of the table, and map entire table.
316 * Minimum length table must contain at least one entry.
317 */
318 length = table->length;
319 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
320
321 if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
322 ACPI_BIOS_ERROR((AE_INFO,
323 "Invalid table length 0x%X in RSDT/XSDT",
324 length));
325 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
326 }
327
328 table = acpi_os_map_memory(address, length);
329 if (!table) {
330 return_ACPI_STATUS(AE_NO_MEMORY);
331 }
332
333 /* Validate the root table checksum */
334
335 status = acpi_tb_verify_checksum(table, length);
336 if (ACPI_FAILURE(status)) {
337 acpi_os_unmap_memory(table, length);
338 return_ACPI_STATUS(status);
339 }
340
341 /* Get the number of entries and pointer to first entry */
342
343 table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
344 table_entry_size);
345 table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
346
347 /* Initialize the root table array from the RSDT/XSDT */
348
349 for (i = 0; i < table_count; i++) {
350
351 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
352
353 address =
354 acpi_tb_get_root_table_entry(table_entry, table_entry_size);
355
356 /* Skip NULL entries in RSDT/XSDT */
357
358 if (!address) {
359 goto next_table;
360 }
361
362 status = acpi_tb_install_standard_table(address,
363 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
364 FALSE, TRUE,
365 &table_index);
366
367 if (ACPI_SUCCESS(status) &&
368 ACPI_COMPARE_NAME(&acpi_gbl_root_table_list.
369 tables[table_index].signature,
370 ACPI_SIG_FADT)) {
371 acpi_gbl_fadt_index = table_index;
372 acpi_tb_parse_fadt();
373 }
374
375next_table:
376
377 table_entry += table_entry_size;
378 }
379
380 acpi_os_unmap_memory(table, length);
381 return_ACPI_STATUS(AE_OK);
382}
383
384/*******************************************************************************
385 *
386 * FUNCTION: acpi_is_valid_signature
387 *
388 * PARAMETERS: signature - Sig string to be validated
389 *
390 * RETURN: TRUE if signature is has 4 valid ACPI characters
391 *
392 * DESCRIPTION: Validate an ACPI table signature.
393 *
394 ******************************************************************************/
395
396u8 acpi_is_valid_signature(char *signature)
397{
398 u32 i;
399
400 /* Validate each character in the signature */
401
402 for (i = 0; i < ACPI_NAME_SIZE; i++) {
403 if (!acpi_ut_valid_acpi_char(signature[i], i)) {
404 return (FALSE);
405 }
406 }
407
408 return (TRUE);
409}