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ACPICA: Restructure includes into public/private
[deliverable/linux.git] / drivers / acpi / tables / tbutils.c
1 /******************************************************************************
2 *
3 * Module Name: tbutils - table utilities
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2008, 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 <acpi/accommon.h>
46 #include <acpi/actables.h>
47
48 #define _COMPONENT ACPI_TABLES
49 ACPI_MODULE_NAME("tbutils")
50
51 /* Local prototypes */
52 static acpi_physical_address
53 acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
54
55 /*******************************************************************************
56 *
57 * FUNCTION: acpi_tb_check_xsdt
58 *
59 * PARAMETERS: address - Pointer to the XSDT
60 *
61 * RETURN: status
62 * AE_OK - XSDT is okay
63 * AE_NO_MEMORY - can't map XSDT
64 * AE_INVALID_TABLE_LENGTH - invalid table length
65 * AE_NULL_ENTRY - XSDT has NULL entry
66 *
67 * DESCRIPTION: validate XSDT
68 ******************************************************************************/
69
70 static acpi_status
71 acpi_tb_check_xsdt(acpi_physical_address address)
72 {
73 struct acpi_table_header *table;
74 u32 length;
75 u64 xsdt_entry_address;
76 u8 *table_entry;
77 u32 table_count;
78 int i;
79
80 table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
81 if (!table)
82 return AE_NO_MEMORY;
83
84 length = table->length;
85 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
86 if (length < sizeof(struct acpi_table_header))
87 return AE_INVALID_TABLE_LENGTH;
88
89 table = acpi_os_map_memory(address, length);
90 if (!table)
91 return AE_NO_MEMORY;
92
93 /* Calculate the number of tables described in XSDT */
94 table_count =
95 (u32) ((table->length -
96 sizeof(struct acpi_table_header)) / sizeof(u64));
97 table_entry =
98 ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
99 for (i = 0; i < table_count; i++) {
100 ACPI_MOVE_64_TO_64(&xsdt_entry_address, table_entry);
101 if (!xsdt_entry_address) {
102 /* XSDT has NULL entry */
103 break;
104 }
105 table_entry += sizeof(u64);
106 }
107 acpi_os_unmap_memory(table, length);
108
109 if (i < table_count)
110 return AE_NULL_ENTRY;
111 else
112 return AE_OK;
113 }
114
115 /*******************************************************************************
116 *
117 * FUNCTION: acpi_tb_initialize_facs
118 *
119 * PARAMETERS: None
120 *
121 * RETURN: Status
122 *
123 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
124 * for accessing the Global Lock and Firmware Waking Vector
125 *
126 ******************************************************************************/
127
128 acpi_status acpi_tb_initialize_facs(void)
129 {
130 acpi_status status;
131
132 status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
133 ACPI_CAST_INDIRECT_PTR(struct
134 acpi_table_header,
135 &acpi_gbl_FACS));
136 return status;
137 }
138
139 /*******************************************************************************
140 *
141 * FUNCTION: acpi_tb_tables_loaded
142 *
143 * PARAMETERS: None
144 *
145 * RETURN: TRUE if required ACPI tables are loaded
146 *
147 * DESCRIPTION: Determine if the minimum required ACPI tables are present
148 * (FADT, FACS, DSDT)
149 *
150 ******************************************************************************/
151
152 u8 acpi_tb_tables_loaded(void)
153 {
154
155 if (acpi_gbl_root_table_list.count >= 3) {
156 return (TRUE);
157 }
158
159 return (FALSE);
160 }
161
162 /*******************************************************************************
163 *
164 * FUNCTION: acpi_tb_print_table_header
165 *
166 * PARAMETERS: Address - Table physical address
167 * Header - Table header
168 *
169 * RETURN: None
170 *
171 * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
172 *
173 ******************************************************************************/
174
175 void
176 acpi_tb_print_table_header(acpi_physical_address address,
177 struct acpi_table_header *header)
178 {
179
180 if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
181
182 /* FACS only has signature and length fields of common table header */
183
184 ACPI_INFO((AE_INFO, "%4.4s %08lX, %04X",
185 header->signature, (unsigned long)address,
186 header->length));
187 } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
188
189 /* RSDP has no common fields */
190
191 ACPI_INFO((AE_INFO, "RSDP %08lX, %04X (r%d %6.6s)",
192 (unsigned long)address,
193 (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
194 revision >
195 0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
196 header)->length : 20,
197 ACPI_CAST_PTR(struct acpi_table_rsdp,
198 header)->revision,
199 ACPI_CAST_PTR(struct acpi_table_rsdp,
200 header)->oem_id));
201 } else {
202 /* Standard ACPI table with full common header */
203
204 ACPI_INFO((AE_INFO,
205 "%4.4s %08lX, %04X (r%d %6.6s %8.8s %8X %4.4s %8X)",
206 header->signature, (unsigned long)address,
207 header->length, header->revision, header->oem_id,
208 header->oem_table_id, header->oem_revision,
209 header->asl_compiler_id,
210 header->asl_compiler_revision));
211 }
212 }
213
214 /*******************************************************************************
215 *
216 * FUNCTION: acpi_tb_validate_checksum
217 *
218 * PARAMETERS: Table - ACPI table to verify
219 * Length - Length of entire table
220 *
221 * RETURN: Status
222 *
223 * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
224 * exception on bad checksum.
225 *
226 ******************************************************************************/
227
228 acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
229 {
230 u8 checksum;
231
232 /* Compute the checksum on the table */
233
234 checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
235
236 /* Checksum ok? (should be zero) */
237
238 if (checksum) {
239 ACPI_WARNING((AE_INFO,
240 "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X",
241 table->signature, table->checksum,
242 (u8) (table->checksum - checksum)));
243
244 #if (ACPI_CHECKSUM_ABORT)
245
246 return (AE_BAD_CHECKSUM);
247 #endif
248 }
249
250 return (AE_OK);
251 }
252
253 /*******************************************************************************
254 *
255 * FUNCTION: acpi_tb_checksum
256 *
257 * PARAMETERS: Buffer - Pointer to memory region to be checked
258 * Length - Length of this memory region
259 *
260 * RETURN: Checksum (u8)
261 *
262 * DESCRIPTION: Calculates circular checksum of memory region.
263 *
264 ******************************************************************************/
265
266 u8 acpi_tb_checksum(u8 *buffer, u32 length)
267 {
268 u8 sum = 0;
269 u8 *end = buffer + length;
270
271 while (buffer < end) {
272 sum = (u8) (sum + *(buffer++));
273 }
274
275 return sum;
276 }
277
278 /*******************************************************************************
279 *
280 * FUNCTION: acpi_tb_install_table
281 *
282 * PARAMETERS: Address - Physical address of DSDT or FACS
283 * Flags - Flags
284 * Signature - Table signature, NULL if no need to
285 * match
286 * table_index - Index into root table array
287 *
288 * RETURN: None
289 *
290 * DESCRIPTION: Install an ACPI table into the global data structure.
291 *
292 ******************************************************************************/
293
294 void
295 acpi_tb_install_table(acpi_physical_address address,
296 u8 flags, char *signature, u32 table_index)
297 {
298 struct acpi_table_header *table;
299
300 if (!address) {
301 ACPI_ERROR((AE_INFO,
302 "Null physical address for ACPI table [%s]",
303 signature));
304 return;
305 }
306
307 /* Map just the table header */
308
309 table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
310 if (!table) {
311 return;
312 }
313
314 /* If a particular signature is expected, signature must match */
315
316 if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
317 ACPI_ERROR((AE_INFO,
318 "Invalid signature 0x%X for ACPI table [%s]",
319 *ACPI_CAST_PTR(u32, table->signature), signature));
320 goto unmap_and_exit;
321 }
322
323 /* Initialize the table entry */
324
325 acpi_gbl_root_table_list.tables[table_index].address = address;
326 acpi_gbl_root_table_list.tables[table_index].length = table->length;
327 acpi_gbl_root_table_list.tables[table_index].flags = flags;
328
329 ACPI_MOVE_32_TO_32(&
330 (acpi_gbl_root_table_list.tables[table_index].
331 signature), table->signature);
332
333 acpi_tb_print_table_header(address, table);
334
335 if (table_index == ACPI_TABLE_INDEX_DSDT) {
336
337 /* Global integer width is based upon revision of the DSDT */
338
339 acpi_ut_set_integer_width(table->revision);
340 }
341
342 unmap_and_exit:
343 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
344 }
345
346 /*******************************************************************************
347 *
348 * FUNCTION: acpi_tb_get_root_table_entry
349 *
350 * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
351 * table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
352 *
353 * RETURN: Physical address extracted from the root table
354 *
355 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
356 * both 32-bit and 64-bit platforms
357 *
358 * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
359 * 64-bit platforms.
360 *
361 ******************************************************************************/
362
363 static acpi_physical_address
364 acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
365 {
366 u64 address64;
367
368 /*
369 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
370 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
371 */
372 if (table_entry_size == sizeof(u32)) {
373 /*
374 * 32-bit platform, RSDT: Return 32-bit table entry
375 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
376 */
377 return ((acpi_physical_address)
378 (*ACPI_CAST_PTR(u32, table_entry)));
379 } else {
380 /*
381 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
382 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, return 64-bit
383 */
384 ACPI_MOVE_64_TO_64(&address64, table_entry);
385
386 #if ACPI_MACHINE_WIDTH == 32
387 if (address64 > ACPI_UINT32_MAX) {
388
389 /* Will truncate 64-bit address to 32 bits, issue warning */
390
391 ACPI_WARNING((AE_INFO,
392 "64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating",
393 ACPI_FORMAT_UINT64(address64)));
394 }
395 #endif
396 return ((acpi_physical_address) (address64));
397 }
398 }
399
400 /*******************************************************************************
401 *
402 * FUNCTION: acpi_tb_parse_root_table
403 *
404 * PARAMETERS: Rsdp - Pointer to the RSDP
405 * Flags - Flags
406 *
407 * RETURN: Status
408 *
409 * DESCRIPTION: This function is called to parse the Root System Description
410 * Table (RSDT or XSDT)
411 *
412 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
413 * be mapped and cannot be copied because it contains the actual
414 * memory location of the ACPI Global Lock.
415 *
416 ******************************************************************************/
417
418 acpi_status __init
419 acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
420 {
421 struct acpi_table_rsdp *rsdp;
422 u32 table_entry_size;
423 u32 i;
424 u32 table_count;
425 struct acpi_table_header *table;
426 acpi_physical_address address;
427 acpi_physical_address uninitialized_var(rsdt_address);
428 u32 length;
429 u8 *table_entry;
430 acpi_status status;
431
432 ACPI_FUNCTION_TRACE(tb_parse_root_table);
433
434 /*
435 * Map the entire RSDP and extract the address of the RSDT or XSDT
436 */
437 rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
438 if (!rsdp) {
439 return_ACPI_STATUS(AE_NO_MEMORY);
440 }
441
442 acpi_tb_print_table_header(rsdp_address,
443 ACPI_CAST_PTR(struct acpi_table_header,
444 rsdp));
445
446 /* Differentiate between RSDT and XSDT root tables */
447
448 if (rsdp->revision > 1 && rsdp->xsdt_physical_address) {
449 /*
450 * Root table is an XSDT (64-bit physical addresses). We must use the
451 * XSDT if the revision is > 1 and the XSDT pointer is present, as per
452 * the ACPI specification.
453 */
454 address = (acpi_physical_address) rsdp->xsdt_physical_address;
455 table_entry_size = sizeof(u64);
456 rsdt_address = (acpi_physical_address)
457 rsdp->rsdt_physical_address;
458 } else {
459 /* Root table is an RSDT (32-bit physical addresses) */
460
461 address = (acpi_physical_address) rsdp->rsdt_physical_address;
462 table_entry_size = sizeof(u32);
463 }
464
465 /*
466 * It is not possible to map more than one entry in some environments,
467 * so unmap the RSDP here before mapping other tables
468 */
469 acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
470
471 if (table_entry_size == sizeof(u64)) {
472 if (acpi_tb_check_xsdt(address) == AE_NULL_ENTRY) {
473 /* XSDT has NULL entry, RSDT is used */
474 address = rsdt_address;
475 table_entry_size = sizeof(u32);
476 ACPI_WARNING((AE_INFO, "BIOS XSDT has NULL entry, "
477 "using RSDT"));
478 }
479 }
480 /* Map the RSDT/XSDT table header to get the full table length */
481
482 table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
483 if (!table) {
484 return_ACPI_STATUS(AE_NO_MEMORY);
485 }
486
487 acpi_tb_print_table_header(address, table);
488
489 /* Get the length of the full table, verify length and map entire table */
490
491 length = table->length;
492 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
493
494 if (length < sizeof(struct acpi_table_header)) {
495 ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
496 length));
497 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
498 }
499
500 table = acpi_os_map_memory(address, length);
501 if (!table) {
502 return_ACPI_STATUS(AE_NO_MEMORY);
503 }
504
505 /* Validate the root table checksum */
506
507 status = acpi_tb_verify_checksum(table, length);
508 if (ACPI_FAILURE(status)) {
509 acpi_os_unmap_memory(table, length);
510 return_ACPI_STATUS(status);
511 }
512
513 /* Calculate the number of tables described in the root table */
514
515 table_count =
516 (u32) ((table->length -
517 sizeof(struct acpi_table_header)) / table_entry_size);
518
519 /*
520 * First two entries in the table array are reserved for the DSDT and FACS,
521 * which are not actually present in the RSDT/XSDT - they come from the FADT
522 */
523 table_entry =
524 ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
525 acpi_gbl_root_table_list.count = 2;
526
527 /*
528 * Initialize the root table array from the RSDT/XSDT
529 */
530 for (i = 0; i < table_count; i++) {
531 if (acpi_gbl_root_table_list.count >=
532 acpi_gbl_root_table_list.size) {
533
534 /* There is no more room in the root table array, attempt resize */
535
536 status = acpi_tb_resize_root_table_list();
537 if (ACPI_FAILURE(status)) {
538 ACPI_WARNING((AE_INFO,
539 "Truncating %u table entries!",
540 (unsigned)
541 (acpi_gbl_root_table_list.size -
542 acpi_gbl_root_table_list.
543 count)));
544 break;
545 }
546 }
547
548 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
549
550 acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
551 address =
552 acpi_tb_get_root_table_entry(table_entry, table_entry_size);
553
554 table_entry += table_entry_size;
555 acpi_gbl_root_table_list.count++;
556 }
557
558 /*
559 * It is not possible to map more than one entry in some environments,
560 * so unmap the root table here before mapping other tables
561 */
562 acpi_os_unmap_memory(table, length);
563
564 /*
565 * Complete the initialization of the root table array by examining
566 * the header of each table
567 */
568 for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
569 acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
570 address, flags, NULL, i);
571
572 /* Special case for FADT - get the DSDT and FACS */
573
574 if (ACPI_COMPARE_NAME
575 (&acpi_gbl_root_table_list.tables[i].signature,
576 ACPI_SIG_FADT)) {
577 acpi_tb_parse_fadt(i, flags);
578 }
579 }
580
581 return_ACPI_STATUS(AE_OK);
582 }
Linux kernel - Deliverables
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