Loading...
1/******************************************************************************
2 *
3 * Module Name: tbfadt - FADT table utilities
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2011, 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("tbfadt")
50
51/* Local prototypes */
52static ACPI_INLINE void
53acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
54 u8 space_id, u8 byte_width, u64 address);
55
56static void acpi_tb_convert_fadt(void);
57
58static void acpi_tb_validate_fadt(void);
59
60static void acpi_tb_setup_fadt_registers(void);
61
62/* Table for conversion of FADT to common internal format and FADT validation */
63
64typedef struct acpi_fadt_info {
65 char *name;
66 u8 address64;
67 u8 address32;
68 u8 length;
69 u8 default_length;
70 u8 type;
71
72} acpi_fadt_info;
73
74#define ACPI_FADT_REQUIRED 1
75#define ACPI_FADT_SEPARATE_LENGTH 2
76
77static struct acpi_fadt_info fadt_info_table[] = {
78 {"Pm1aEventBlock",
79 ACPI_FADT_OFFSET(xpm1a_event_block),
80 ACPI_FADT_OFFSET(pm1a_event_block),
81 ACPI_FADT_OFFSET(pm1_event_length),
82 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
83 ACPI_FADT_REQUIRED},
84
85 {"Pm1bEventBlock",
86 ACPI_FADT_OFFSET(xpm1b_event_block),
87 ACPI_FADT_OFFSET(pm1b_event_block),
88 ACPI_FADT_OFFSET(pm1_event_length),
89 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
90 0},
91
92 {"Pm1aControlBlock",
93 ACPI_FADT_OFFSET(xpm1a_control_block),
94 ACPI_FADT_OFFSET(pm1a_control_block),
95 ACPI_FADT_OFFSET(pm1_control_length),
96 ACPI_PM1_REGISTER_WIDTH,
97 ACPI_FADT_REQUIRED},
98
99 {"Pm1bControlBlock",
100 ACPI_FADT_OFFSET(xpm1b_control_block),
101 ACPI_FADT_OFFSET(pm1b_control_block),
102 ACPI_FADT_OFFSET(pm1_control_length),
103 ACPI_PM1_REGISTER_WIDTH,
104 0},
105
106 {"Pm2ControlBlock",
107 ACPI_FADT_OFFSET(xpm2_control_block),
108 ACPI_FADT_OFFSET(pm2_control_block),
109 ACPI_FADT_OFFSET(pm2_control_length),
110 ACPI_PM2_REGISTER_WIDTH,
111 ACPI_FADT_SEPARATE_LENGTH},
112
113 {"PmTimerBlock",
114 ACPI_FADT_OFFSET(xpm_timer_block),
115 ACPI_FADT_OFFSET(pm_timer_block),
116 ACPI_FADT_OFFSET(pm_timer_length),
117 ACPI_PM_TIMER_WIDTH,
118 ACPI_FADT_REQUIRED},
119
120 {"Gpe0Block",
121 ACPI_FADT_OFFSET(xgpe0_block),
122 ACPI_FADT_OFFSET(gpe0_block),
123 ACPI_FADT_OFFSET(gpe0_block_length),
124 0,
125 ACPI_FADT_SEPARATE_LENGTH},
126
127 {"Gpe1Block",
128 ACPI_FADT_OFFSET(xgpe1_block),
129 ACPI_FADT_OFFSET(gpe1_block),
130 ACPI_FADT_OFFSET(gpe1_block_length),
131 0,
132 ACPI_FADT_SEPARATE_LENGTH}
133};
134
135#define ACPI_FADT_INFO_ENTRIES \
136 (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
137
138/* Table used to split Event Blocks into separate status/enable registers */
139
140typedef struct acpi_fadt_pm_info {
141 struct acpi_generic_address *target;
142 u8 source;
143 u8 register_num;
144
145} acpi_fadt_pm_info;
146
147static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
148 {&acpi_gbl_xpm1a_status,
149 ACPI_FADT_OFFSET(xpm1a_event_block),
150 0},
151
152 {&acpi_gbl_xpm1a_enable,
153 ACPI_FADT_OFFSET(xpm1a_event_block),
154 1},
155
156 {&acpi_gbl_xpm1b_status,
157 ACPI_FADT_OFFSET(xpm1b_event_block),
158 0},
159
160 {&acpi_gbl_xpm1b_enable,
161 ACPI_FADT_OFFSET(xpm1b_event_block),
162 1}
163};
164
165#define ACPI_FADT_PM_INFO_ENTRIES \
166 (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
167
168/*******************************************************************************
169 *
170 * FUNCTION: acpi_tb_init_generic_address
171 *
172 * PARAMETERS: generic_address - GAS struct to be initialized
173 * byte_width - Width of this register
174 * Address - Address of the register
175 *
176 * RETURN: None
177 *
178 * DESCRIPTION: Initialize a Generic Address Structure (GAS)
179 * See the ACPI specification for a full description and
180 * definition of this structure.
181 *
182 ******************************************************************************/
183
184static ACPI_INLINE void
185acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
186 u8 space_id, u8 byte_width, u64 address)
187{
188
189 /*
190 * The 64-bit Address field is non-aligned in the byte packed
191 * GAS struct.
192 */
193 ACPI_MOVE_64_TO_64(&generic_address->address, &address);
194
195 /* All other fields are byte-wide */
196
197 generic_address->space_id = space_id;
198 generic_address->bit_width = (u8)ACPI_MUL_8(byte_width);
199 generic_address->bit_offset = 0;
200 generic_address->access_width = 0; /* Access width ANY */
201}
202
203/*******************************************************************************
204 *
205 * FUNCTION: acpi_tb_parse_fadt
206 *
207 * PARAMETERS: table_index - Index for the FADT
208 *
209 * RETURN: None
210 *
211 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
212 * (FADT contains the addresses of the DSDT and FACS)
213 *
214 ******************************************************************************/
215
216void acpi_tb_parse_fadt(u32 table_index)
217{
218 u32 length;
219 struct acpi_table_header *table;
220
221 /*
222 * The FADT has multiple versions with different lengths,
223 * and it contains pointers to both the DSDT and FACS tables.
224 *
225 * Get a local copy of the FADT and convert it to a common format
226 * Map entire FADT, assumed to be smaller than one page.
227 */
228 length = acpi_gbl_root_table_list.tables[table_index].length;
229
230 table =
231 acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
232 address, length);
233 if (!table) {
234 return;
235 }
236
237 /*
238 * Validate the FADT checksum before we copy the table. Ignore
239 * checksum error as we want to try to get the DSDT and FACS.
240 */
241 (void)acpi_tb_verify_checksum(table, length);
242
243 /* Create a local copy of the FADT in common ACPI 2.0+ format */
244
245 acpi_tb_create_local_fadt(table, length);
246
247 /* All done with the real FADT, unmap it */
248
249 acpi_os_unmap_memory(table, length);
250
251 /* Obtain the DSDT and FACS tables via their addresses within the FADT */
252
253 acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
254 ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
255
256 acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
257 ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
258}
259
260/*******************************************************************************
261 *
262 * FUNCTION: acpi_tb_create_local_fadt
263 *
264 * PARAMETERS: Table - Pointer to BIOS FADT
265 * Length - Length of the table
266 *
267 * RETURN: None
268 *
269 * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
270 * Performs validation on some important FADT fields.
271 *
272 * NOTE: We create a local copy of the FADT regardless of the version.
273 *
274 ******************************************************************************/
275
276void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
277{
278 /*
279 * Check if the FADT is larger than the largest table that we expect
280 * (the ACPI 2.0/3.0 version). If so, truncate the table, and issue
281 * a warning.
282 */
283 if (length > sizeof(struct acpi_table_fadt)) {
284 ACPI_WARNING((AE_INFO,
285 "FADT (revision %u) is longer than ACPI 2.0 version, "
286 "truncating length %u to %u",
287 table->revision, length,
288 (u32)sizeof(struct acpi_table_fadt)));
289 }
290
291 /* Clear the entire local FADT */
292
293 ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
294
295 /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
296
297 ACPI_MEMCPY(&acpi_gbl_FADT, table,
298 ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
299
300 /* Convert the local copy of the FADT to the common internal format */
301
302 acpi_tb_convert_fadt();
303
304 /* Validate FADT values now, before we make any changes */
305
306 acpi_tb_validate_fadt();
307
308 /* Initialize the global ACPI register structures */
309
310 acpi_tb_setup_fadt_registers();
311}
312
313/*******************************************************************************
314 *
315 * FUNCTION: acpi_tb_convert_fadt
316 *
317 * PARAMETERS: None, uses acpi_gbl_FADT
318 *
319 * RETURN: None
320 *
321 * DESCRIPTION: Converts all versions of the FADT to a common internal format.
322 * Expand 32-bit addresses to 64-bit as necessary.
323 *
324 * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt),
325 * and must contain a copy of the actual FADT.
326 *
327 * Notes on 64-bit register addresses:
328 *
329 * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
330 * fields of the FADT for all ACPI register addresses.
331 *
332 * The 64-bit "X" fields are optional extensions to the original 32-bit FADT
333 * V1.0 fields. Even if they are present in the FADT, they are optional and
334 * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
335 * 32-bit V1.0 fields if the corresponding X field is zero.
336 *
337 * For ACPI 1.0 FADTs, all 32-bit address fields are expanded to the
338 * corresponding "X" fields in the internal FADT.
339 *
340 * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
341 * to the corresponding 64-bit X fields. For compatibility with other ACPI
342 * implementations, we ignore the 64-bit field if the 32-bit field is valid,
343 * regardless of whether the host OS is 32-bit or 64-bit.
344 *
345 ******************************************************************************/
346
347static void acpi_tb_convert_fadt(void)
348{
349 struct acpi_generic_address *address64;
350 u32 address32;
351 u32 i;
352
353 /* Update the local FADT table header length */
354
355 acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
356
357 /*
358 * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
359 * Later code will always use the X 64-bit field. Also, check for an
360 * address mismatch between the 32-bit and 64-bit address fields
361 * (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate
362 * the presence of two FACS or two DSDT tables.
363 */
364 if (!acpi_gbl_FADT.Xfacs) {
365 acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
366 } else if (acpi_gbl_FADT.facs &&
367 (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
368 ACPI_WARNING((AE_INFO,
369 "32/64 FACS address mismatch in FADT - two FACS tables!"));
370 }
371
372 if (!acpi_gbl_FADT.Xdsdt) {
373 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
374 } else if (acpi_gbl_FADT.dsdt &&
375 (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
376 ACPI_WARNING((AE_INFO,
377 "32/64 DSDT address mismatch in FADT - two DSDT tables!"));
378 }
379
380 /*
381 * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
382 * should be zero are indeed zero. This will workaround BIOSs that
383 * inadvertently place values in these fields.
384 *
385 * The ACPI 1.0 reserved fields that will be zeroed are the bytes located at
386 * offset 45, 55, 95, and the word located at offset 109, 110.
387 *
388 * Note: The FADT revision value is unreliable. Only the length can be
389 * trusted.
390 */
391 if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
392 acpi_gbl_FADT.preferred_profile = 0;
393 acpi_gbl_FADT.pstate_control = 0;
394 acpi_gbl_FADT.cst_control = 0;
395 acpi_gbl_FADT.boot_flags = 0;
396 }
397
398 /*
399 * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
400 * generic address structures as necessary. Later code will always use
401 * the 64-bit address structures.
402 *
403 * March 2009:
404 * We now always use the 32-bit address if it is valid (non-null). This
405 * is not in accordance with the ACPI specification which states that
406 * the 64-bit address supersedes the 32-bit version, but we do this for
407 * compatibility with other ACPI implementations. Most notably, in the
408 * case where both the 32 and 64 versions are non-null, we use the 32-bit
409 * version. This is the only address that is guaranteed to have been
410 * tested by the BIOS manufacturer.
411 */
412 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
413 address32 = *ACPI_ADD_PTR(u32,
414 &acpi_gbl_FADT,
415 fadt_info_table[i].address32);
416
417 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
418 &acpi_gbl_FADT,
419 fadt_info_table[i].address64);
420
421 /*
422 * If both 32- and 64-bit addresses are valid (non-zero),
423 * they must match.
424 */
425 if (address64->address && address32 &&
426 (address64->address != (u64) address32)) {
427 ACPI_ERROR((AE_INFO,
428 "32/64X address mismatch in %s: 0x%8.8X/0x%8.8X%8.8X, using 32",
429 fadt_info_table[i].name, address32,
430 ACPI_FORMAT_UINT64(address64->address)));
431 }
432
433 /* Always use 32-bit address if it is valid (non-null) */
434
435 if (address32) {
436 /*
437 * Copy the 32-bit address to the 64-bit GAS structure. The
438 * Space ID is always I/O for 32-bit legacy address fields
439 */
440 acpi_tb_init_generic_address(address64,
441 ACPI_ADR_SPACE_SYSTEM_IO,
442 *ACPI_ADD_PTR(u8,
443 &acpi_gbl_FADT,
444 fadt_info_table
445 [i].length),
446 (u64) address32);
447 }
448 }
449}
450
451/*******************************************************************************
452 *
453 * FUNCTION: acpi_tb_validate_fadt
454 *
455 * PARAMETERS: Table - Pointer to the FADT to be validated
456 *
457 * RETURN: None
458 *
459 * DESCRIPTION: Validate various important fields within the FADT. If a problem
460 * is found, issue a message, but no status is returned.
461 * Used by both the table manager and the disassembler.
462 *
463 * Possible additional checks:
464 * (acpi_gbl_FADT.pm1_event_length >= 4)
465 * (acpi_gbl_FADT.pm1_control_length >= 2)
466 * (acpi_gbl_FADT.pm_timer_length >= 4)
467 * Gpe block lengths must be multiple of 2
468 *
469 ******************************************************************************/
470
471static void acpi_tb_validate_fadt(void)
472{
473 char *name;
474 struct acpi_generic_address *address64;
475 u8 length;
476 u32 i;
477
478 /*
479 * Check for FACS and DSDT address mismatches. An address mismatch between
480 * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
481 * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
482 */
483 if (acpi_gbl_FADT.facs &&
484 (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
485 ACPI_WARNING((AE_INFO,
486 "32/64X FACS address mismatch in FADT - "
487 "0x%8.8X/0x%8.8X%8.8X, using 32",
488 acpi_gbl_FADT.facs,
489 ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs)));
490
491 acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
492 }
493
494 if (acpi_gbl_FADT.dsdt &&
495 (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
496 ACPI_WARNING((AE_INFO,
497 "32/64X DSDT address mismatch in FADT - "
498 "0x%8.8X/0x%8.8X%8.8X, using 32",
499 acpi_gbl_FADT.dsdt,
500 ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt)));
501
502 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
503 }
504
505 /* Examine all of the 64-bit extended address fields (X fields) */
506
507 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
508 /*
509 * Generate pointer to the 64-bit address, get the register
510 * length (width) and the register name
511 */
512 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
513 &acpi_gbl_FADT,
514 fadt_info_table[i].address64);
515 length =
516 *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
517 fadt_info_table[i].length);
518 name = fadt_info_table[i].name;
519
520 /*
521 * For each extended field, check for length mismatch between the
522 * legacy length field and the corresponding 64-bit X length field.
523 */
524 if (address64->address &&
525 (address64->bit_width != ACPI_MUL_8(length))) {
526 ACPI_WARNING((AE_INFO,
527 "32/64X length mismatch in %s: %u/%u",
528 name, ACPI_MUL_8(length),
529 address64->bit_width));
530 }
531
532 if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
533 /*
534 * Field is required (Pm1a_event, Pm1a_control, pm_timer).
535 * Both the address and length must be non-zero.
536 */
537 if (!address64->address || !length) {
538 ACPI_ERROR((AE_INFO,
539 "Required field %s has zero address and/or length:"
540 " 0x%8.8X%8.8X/0x%X",
541 name,
542 ACPI_FORMAT_UINT64(address64->
543 address),
544 length));
545 }
546 } else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
547 /*
548 * Field is optional (PM2Control, GPE0, GPE1) AND has its own
549 * length field. If present, both the address and length must
550 * be valid.
551 */
552 if ((address64->address && !length) ||
553 (!address64->address && length)) {
554 ACPI_WARNING((AE_INFO,
555 "Optional field %s has zero address or length: "
556 "0x%8.8X%8.8X/0x%X",
557 name,
558 ACPI_FORMAT_UINT64(address64->
559 address),
560 length));
561 }
562 }
563 }
564}
565
566/*******************************************************************************
567 *
568 * FUNCTION: acpi_tb_setup_fadt_registers
569 *
570 * PARAMETERS: None, uses acpi_gbl_FADT.
571 *
572 * RETURN: None
573 *
574 * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
575 * force FADT register definitions to their default lengths.
576 *
577 ******************************************************************************/
578
579static void acpi_tb_setup_fadt_registers(void)
580{
581 struct acpi_generic_address *target64;
582 struct acpi_generic_address *source64;
583 u8 pm1_register_byte_width;
584 u32 i;
585
586 /*
587 * Optionally check all register lengths against the default values and
588 * update them if they are incorrect.
589 */
590 if (acpi_gbl_use_default_register_widths) {
591 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
592 target64 =
593 ACPI_ADD_PTR(struct acpi_generic_address,
594 &acpi_gbl_FADT,
595 fadt_info_table[i].address64);
596
597 /*
598 * If a valid register (Address != 0) and the (default_length > 0)
599 * (Not a GPE register), then check the width against the default.
600 */
601 if ((target64->address) &&
602 (fadt_info_table[i].default_length > 0) &&
603 (fadt_info_table[i].default_length !=
604 target64->bit_width)) {
605 ACPI_WARNING((AE_INFO,
606 "Invalid length for %s: %u, using default %u",
607 fadt_info_table[i].name,
608 target64->bit_width,
609 fadt_info_table[i].
610 default_length));
611
612 /* Incorrect size, set width to the default */
613
614 target64->bit_width =
615 fadt_info_table[i].default_length;
616 }
617 }
618 }
619
620 /*
621 * Get the length of the individual PM1 registers (enable and status).
622 * Each register is defined to be (event block length / 2). Extra divide
623 * by 8 converts bits to bytes.
624 */
625 pm1_register_byte_width = (u8)
626 ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
627
628 /*
629 * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
630 * registers. These addresses do not appear (directly) in the FADT, so it
631 * is useful to pre-calculate them from the PM1 Event Block definitions.
632 *
633 * The PM event blocks are split into two register blocks, first is the
634 * PM Status Register block, followed immediately by the PM Enable
635 * Register block. Each is of length (pm1_event_length/2)
636 *
637 * Note: The PM1A event block is required by the ACPI specification.
638 * However, the PM1B event block is optional and is rarely, if ever,
639 * used.
640 */
641
642 for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
643 source64 =
644 ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
645 fadt_pm_info_table[i].source);
646
647 if (source64->address) {
648 acpi_tb_init_generic_address(fadt_pm_info_table[i].
649 target, source64->space_id,
650 pm1_register_byte_width,
651 source64->address +
652 (fadt_pm_info_table[i].
653 register_num *
654 pm1_register_byte_width));
655 }
656 }
657}
1/******************************************************************************
2 *
3 * Module Name: tbfadt - FADT table utilities
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2012, 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("tbfadt")
50
51/* Local prototypes */
52static ACPI_INLINE void
53acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
54 u8 space_id, u8 byte_width, u64 address);
55
56static void acpi_tb_convert_fadt(void);
57
58static void acpi_tb_validate_fadt(void);
59
60static void acpi_tb_setup_fadt_registers(void);
61
62/* Table for conversion of FADT to common internal format and FADT validation */
63
64typedef struct acpi_fadt_info {
65 char *name;
66 u16 address64;
67 u16 address32;
68 u16 length;
69 u8 default_length;
70 u8 type;
71
72} acpi_fadt_info;
73
74#define ACPI_FADT_OPTIONAL 0
75#define ACPI_FADT_REQUIRED 1
76#define ACPI_FADT_SEPARATE_LENGTH 2
77
78static struct acpi_fadt_info fadt_info_table[] = {
79 {"Pm1aEventBlock",
80 ACPI_FADT_OFFSET(xpm1a_event_block),
81 ACPI_FADT_OFFSET(pm1a_event_block),
82 ACPI_FADT_OFFSET(pm1_event_length),
83 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
84 ACPI_FADT_REQUIRED},
85
86 {"Pm1bEventBlock",
87 ACPI_FADT_OFFSET(xpm1b_event_block),
88 ACPI_FADT_OFFSET(pm1b_event_block),
89 ACPI_FADT_OFFSET(pm1_event_length),
90 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
91 ACPI_FADT_OPTIONAL},
92
93 {"Pm1aControlBlock",
94 ACPI_FADT_OFFSET(xpm1a_control_block),
95 ACPI_FADT_OFFSET(pm1a_control_block),
96 ACPI_FADT_OFFSET(pm1_control_length),
97 ACPI_PM1_REGISTER_WIDTH,
98 ACPI_FADT_REQUIRED},
99
100 {"Pm1bControlBlock",
101 ACPI_FADT_OFFSET(xpm1b_control_block),
102 ACPI_FADT_OFFSET(pm1b_control_block),
103 ACPI_FADT_OFFSET(pm1_control_length),
104 ACPI_PM1_REGISTER_WIDTH,
105 ACPI_FADT_OPTIONAL},
106
107 {"Pm2ControlBlock",
108 ACPI_FADT_OFFSET(xpm2_control_block),
109 ACPI_FADT_OFFSET(pm2_control_block),
110 ACPI_FADT_OFFSET(pm2_control_length),
111 ACPI_PM2_REGISTER_WIDTH,
112 ACPI_FADT_SEPARATE_LENGTH},
113
114 {"PmTimerBlock",
115 ACPI_FADT_OFFSET(xpm_timer_block),
116 ACPI_FADT_OFFSET(pm_timer_block),
117 ACPI_FADT_OFFSET(pm_timer_length),
118 ACPI_PM_TIMER_WIDTH,
119 ACPI_FADT_REQUIRED},
120
121 {"Gpe0Block",
122 ACPI_FADT_OFFSET(xgpe0_block),
123 ACPI_FADT_OFFSET(gpe0_block),
124 ACPI_FADT_OFFSET(gpe0_block_length),
125 0,
126 ACPI_FADT_SEPARATE_LENGTH},
127
128 {"Gpe1Block",
129 ACPI_FADT_OFFSET(xgpe1_block),
130 ACPI_FADT_OFFSET(gpe1_block),
131 ACPI_FADT_OFFSET(gpe1_block_length),
132 0,
133 ACPI_FADT_SEPARATE_LENGTH}
134};
135
136#define ACPI_FADT_INFO_ENTRIES \
137 (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
138
139/* Table used to split Event Blocks into separate status/enable registers */
140
141typedef struct acpi_fadt_pm_info {
142 struct acpi_generic_address *target;
143 u16 source;
144 u8 register_num;
145
146} acpi_fadt_pm_info;
147
148static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
149 {&acpi_gbl_xpm1a_status,
150 ACPI_FADT_OFFSET(xpm1a_event_block),
151 0},
152
153 {&acpi_gbl_xpm1a_enable,
154 ACPI_FADT_OFFSET(xpm1a_event_block),
155 1},
156
157 {&acpi_gbl_xpm1b_status,
158 ACPI_FADT_OFFSET(xpm1b_event_block),
159 0},
160
161 {&acpi_gbl_xpm1b_enable,
162 ACPI_FADT_OFFSET(xpm1b_event_block),
163 1}
164};
165
166#define ACPI_FADT_PM_INFO_ENTRIES \
167 (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
168
169/*******************************************************************************
170 *
171 * FUNCTION: acpi_tb_init_generic_address
172 *
173 * PARAMETERS: generic_address - GAS struct to be initialized
174 * byte_width - Width of this register
175 * Address - Address of the register
176 *
177 * RETURN: None
178 *
179 * DESCRIPTION: Initialize a Generic Address Structure (GAS)
180 * See the ACPI specification for a full description and
181 * definition of this structure.
182 *
183 ******************************************************************************/
184
185static ACPI_INLINE void
186acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
187 u8 space_id, u8 byte_width, u64 address)
188{
189
190 /*
191 * The 64-bit Address field is non-aligned in the byte packed
192 * GAS struct.
193 */
194 ACPI_MOVE_64_TO_64(&generic_address->address, &address);
195
196 /* All other fields are byte-wide */
197
198 generic_address->space_id = space_id;
199 generic_address->bit_width = (u8)ACPI_MUL_8(byte_width);
200 generic_address->bit_offset = 0;
201 generic_address->access_width = 0; /* Access width ANY */
202}
203
204/*******************************************************************************
205 *
206 * FUNCTION: acpi_tb_parse_fadt
207 *
208 * PARAMETERS: table_index - Index for the FADT
209 *
210 * RETURN: None
211 *
212 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
213 * (FADT contains the addresses of the DSDT and FACS)
214 *
215 ******************************************************************************/
216
217void acpi_tb_parse_fadt(u32 table_index)
218{
219 u32 length;
220 struct acpi_table_header *table;
221
222 /*
223 * The FADT has multiple versions with different lengths,
224 * and it contains pointers to both the DSDT and FACS tables.
225 *
226 * Get a local copy of the FADT and convert it to a common format
227 * Map entire FADT, assumed to be smaller than one page.
228 */
229 length = acpi_gbl_root_table_list.tables[table_index].length;
230
231 table =
232 acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
233 address, length);
234 if (!table) {
235 return;
236 }
237
238 /*
239 * Validate the FADT checksum before we copy the table. Ignore
240 * checksum error as we want to try to get the DSDT and FACS.
241 */
242 (void)acpi_tb_verify_checksum(table, length);
243
244 /* Create a local copy of the FADT in common ACPI 2.0+ format */
245
246 acpi_tb_create_local_fadt(table, length);
247
248 /* All done with the real FADT, unmap it */
249
250 acpi_os_unmap_memory(table, length);
251
252 /* Obtain the DSDT and FACS tables via their addresses within the FADT */
253
254 acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
255 ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
256
257 /* If Hardware Reduced flag is set, there is no FACS */
258
259 if (!acpi_gbl_reduced_hardware) {
260 acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.
261 Xfacs, ACPI_SIG_FACS,
262 ACPI_TABLE_INDEX_FACS);
263 }
264}
265
266/*******************************************************************************
267 *
268 * FUNCTION: acpi_tb_create_local_fadt
269 *
270 * PARAMETERS: Table - Pointer to BIOS FADT
271 * Length - Length of the table
272 *
273 * RETURN: None
274 *
275 * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
276 * Performs validation on some important FADT fields.
277 *
278 * NOTE: We create a local copy of the FADT regardless of the version.
279 *
280 ******************************************************************************/
281
282void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
283{
284 /*
285 * Check if the FADT is larger than the largest table that we expect
286 * (the ACPI 5.0 version). If so, truncate the table, and issue
287 * a warning.
288 */
289 if (length > sizeof(struct acpi_table_fadt)) {
290 ACPI_WARNING((AE_INFO,
291 "FADT (revision %u) is longer than ACPI 5.0 version, "
292 "truncating length %u to %u",
293 table->revision, length,
294 (u32)sizeof(struct acpi_table_fadt)));
295 }
296
297 /* Clear the entire local FADT */
298
299 ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
300
301 /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
302
303 ACPI_MEMCPY(&acpi_gbl_FADT, table,
304 ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
305
306 /* Take a copy of the Hardware Reduced flag */
307
308 acpi_gbl_reduced_hardware = FALSE;
309 if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
310 acpi_gbl_reduced_hardware = TRUE;
311 }
312
313 /* Convert the local copy of the FADT to the common internal format */
314
315 acpi_tb_convert_fadt();
316
317 /* Validate FADT values now, before we make any changes */
318
319 acpi_tb_validate_fadt();
320
321 /* Initialize the global ACPI register structures */
322
323 acpi_tb_setup_fadt_registers();
324}
325
326/*******************************************************************************
327 *
328 * FUNCTION: acpi_tb_convert_fadt
329 *
330 * PARAMETERS: None, uses acpi_gbl_FADT
331 *
332 * RETURN: None
333 *
334 * DESCRIPTION: Converts all versions of the FADT to a common internal format.
335 * Expand 32-bit addresses to 64-bit as necessary.
336 *
337 * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt),
338 * and must contain a copy of the actual FADT.
339 *
340 * Notes on 64-bit register addresses:
341 *
342 * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
343 * fields of the FADT for all ACPI register addresses.
344 *
345 * The 64-bit "X" fields are optional extensions to the original 32-bit FADT
346 * V1.0 fields. Even if they are present in the FADT, they are optional and
347 * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
348 * 32-bit V1.0 fields if the corresponding X field is zero.
349 *
350 * For ACPI 1.0 FADTs, all 32-bit address fields are expanded to the
351 * corresponding "X" fields in the internal FADT.
352 *
353 * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
354 * to the corresponding 64-bit X fields. For compatibility with other ACPI
355 * implementations, we ignore the 64-bit field if the 32-bit field is valid,
356 * regardless of whether the host OS is 32-bit or 64-bit.
357 *
358 ******************************************************************************/
359
360static void acpi_tb_convert_fadt(void)
361{
362 struct acpi_generic_address *address64;
363 u32 address32;
364 u32 i;
365
366 /*
367 * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
368 * Later code will always use the X 64-bit field. Also, check for an
369 * address mismatch between the 32-bit and 64-bit address fields
370 * (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate
371 * the presence of two FACS or two DSDT tables.
372 */
373 if (!acpi_gbl_FADT.Xfacs) {
374 acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
375 } else if (acpi_gbl_FADT.facs &&
376 (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
377 ACPI_WARNING((AE_INFO,
378 "32/64 FACS address mismatch in FADT - two FACS tables!"));
379 }
380
381 if (!acpi_gbl_FADT.Xdsdt) {
382 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
383 } else if (acpi_gbl_FADT.dsdt &&
384 (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
385 ACPI_WARNING((AE_INFO,
386 "32/64 DSDT address mismatch in FADT - two DSDT tables!"));
387 }
388
389 /*
390 * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
391 * should be zero are indeed zero. This will workaround BIOSs that
392 * inadvertently place values in these fields.
393 *
394 * The ACPI 1.0 reserved fields that will be zeroed are the bytes located at
395 * offset 45, 55, 95, and the word located at offset 109, 110.
396 *
397 * Note: The FADT revision value is unreliable. Only the length can be
398 * trusted.
399 */
400 if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
401 acpi_gbl_FADT.preferred_profile = 0;
402 acpi_gbl_FADT.pstate_control = 0;
403 acpi_gbl_FADT.cst_control = 0;
404 acpi_gbl_FADT.boot_flags = 0;
405 }
406
407 /* Update the local FADT table header length */
408
409 acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
410
411 /*
412 * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
413 * generic address structures as necessary. Later code will always use
414 * the 64-bit address structures.
415 *
416 * March 2009:
417 * We now always use the 32-bit address if it is valid (non-null). This
418 * is not in accordance with the ACPI specification which states that
419 * the 64-bit address supersedes the 32-bit version, but we do this for
420 * compatibility with other ACPI implementations. Most notably, in the
421 * case where both the 32 and 64 versions are non-null, we use the 32-bit
422 * version. This is the only address that is guaranteed to have been
423 * tested by the BIOS manufacturer.
424 */
425 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
426 address32 = *ACPI_ADD_PTR(u32,
427 &acpi_gbl_FADT,
428 fadt_info_table[i].address32);
429
430 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
431 &acpi_gbl_FADT,
432 fadt_info_table[i].address64);
433
434 /*
435 * If both 32- and 64-bit addresses are valid (non-zero),
436 * they must match.
437 */
438 if (address64->address && address32 &&
439 (address64->address != (u64) address32)) {
440 ACPI_ERROR((AE_INFO,
441 "32/64X address mismatch in %s: 0x%8.8X/0x%8.8X%8.8X, using 32",
442 fadt_info_table[i].name, address32,
443 ACPI_FORMAT_UINT64(address64->address)));
444 }
445
446 /* Always use 32-bit address if it is valid (non-null) */
447
448 if (address32) {
449 /*
450 * Copy the 32-bit address to the 64-bit GAS structure. The
451 * Space ID is always I/O for 32-bit legacy address fields
452 */
453 acpi_tb_init_generic_address(address64,
454 ACPI_ADR_SPACE_SYSTEM_IO,
455 *ACPI_ADD_PTR(u8,
456 &acpi_gbl_FADT,
457 fadt_info_table
458 [i].length),
459 (u64) address32);
460 }
461 }
462}
463
464/*******************************************************************************
465 *
466 * FUNCTION: acpi_tb_validate_fadt
467 *
468 * PARAMETERS: Table - Pointer to the FADT to be validated
469 *
470 * RETURN: None
471 *
472 * DESCRIPTION: Validate various important fields within the FADT. If a problem
473 * is found, issue a message, but no status is returned.
474 * Used by both the table manager and the disassembler.
475 *
476 * Possible additional checks:
477 * (acpi_gbl_FADT.pm1_event_length >= 4)
478 * (acpi_gbl_FADT.pm1_control_length >= 2)
479 * (acpi_gbl_FADT.pm_timer_length >= 4)
480 * Gpe block lengths must be multiple of 2
481 *
482 ******************************************************************************/
483
484static void acpi_tb_validate_fadt(void)
485{
486 char *name;
487 struct acpi_generic_address *address64;
488 u8 length;
489 u32 i;
490
491 /*
492 * Check for FACS and DSDT address mismatches. An address mismatch between
493 * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
494 * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
495 */
496 if (acpi_gbl_FADT.facs &&
497 (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
498 ACPI_WARNING((AE_INFO,
499 "32/64X FACS address mismatch in FADT - "
500 "0x%8.8X/0x%8.8X%8.8X, using 32",
501 acpi_gbl_FADT.facs,
502 ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs)));
503
504 acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
505 }
506
507 if (acpi_gbl_FADT.dsdt &&
508 (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
509 ACPI_WARNING((AE_INFO,
510 "32/64X DSDT address mismatch in FADT - "
511 "0x%8.8X/0x%8.8X%8.8X, using 32",
512 acpi_gbl_FADT.dsdt,
513 ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt)));
514
515 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
516 }
517
518 /* If Hardware Reduced flag is set, we are all done */
519
520 if (acpi_gbl_reduced_hardware) {
521 return;
522 }
523
524 /* Examine all of the 64-bit extended address fields (X fields) */
525
526 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
527 /*
528 * Generate pointer to the 64-bit address, get the register
529 * length (width) and the register name
530 */
531 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
532 &acpi_gbl_FADT,
533 fadt_info_table[i].address64);
534 length =
535 *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
536 fadt_info_table[i].length);
537 name = fadt_info_table[i].name;
538
539 /*
540 * For each extended field, check for length mismatch between the
541 * legacy length field and the corresponding 64-bit X length field.
542 */
543 if (address64->address &&
544 (address64->bit_width != ACPI_MUL_8(length))) {
545 ACPI_WARNING((AE_INFO,
546 "32/64X length mismatch in %s: %u/%u",
547 name, ACPI_MUL_8(length),
548 address64->bit_width));
549 }
550
551 if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
552 /*
553 * Field is required (Pm1a_event, Pm1a_control, pm_timer).
554 * Both the address and length must be non-zero.
555 */
556 if (!address64->address || !length) {
557 ACPI_ERROR((AE_INFO,
558 "Required field %s has zero address and/or length:"
559 " 0x%8.8X%8.8X/0x%X",
560 name,
561 ACPI_FORMAT_UINT64(address64->
562 address),
563 length));
564 }
565 } else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
566 /*
567 * Field is optional (PM2Control, GPE0, GPE1) AND has its own
568 * length field. If present, both the address and length must
569 * be valid.
570 */
571 if ((address64->address && !length) ||
572 (!address64->address && length)) {
573 ACPI_WARNING((AE_INFO,
574 "Optional field %s has zero address or length: "
575 "0x%8.8X%8.8X/0x%X",
576 name,
577 ACPI_FORMAT_UINT64(address64->
578 address),
579 length));
580 }
581 }
582 }
583}
584
585/*******************************************************************************
586 *
587 * FUNCTION: acpi_tb_setup_fadt_registers
588 *
589 * PARAMETERS: None, uses acpi_gbl_FADT.
590 *
591 * RETURN: None
592 *
593 * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
594 * force FADT register definitions to their default lengths.
595 *
596 ******************************************************************************/
597
598static void acpi_tb_setup_fadt_registers(void)
599{
600 struct acpi_generic_address *target64;
601 struct acpi_generic_address *source64;
602 u8 pm1_register_byte_width;
603 u32 i;
604
605 /*
606 * Optionally check all register lengths against the default values and
607 * update them if they are incorrect.
608 */
609 if (acpi_gbl_use_default_register_widths) {
610 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
611 target64 =
612 ACPI_ADD_PTR(struct acpi_generic_address,
613 &acpi_gbl_FADT,
614 fadt_info_table[i].address64);
615
616 /*
617 * If a valid register (Address != 0) and the (default_length > 0)
618 * (Not a GPE register), then check the width against the default.
619 */
620 if ((target64->address) &&
621 (fadt_info_table[i].default_length > 0) &&
622 (fadt_info_table[i].default_length !=
623 target64->bit_width)) {
624 ACPI_WARNING((AE_INFO,
625 "Invalid length for %s: %u, using default %u",
626 fadt_info_table[i].name,
627 target64->bit_width,
628 fadt_info_table[i].
629 default_length));
630
631 /* Incorrect size, set width to the default */
632
633 target64->bit_width =
634 fadt_info_table[i].default_length;
635 }
636 }
637 }
638
639 /*
640 * Get the length of the individual PM1 registers (enable and status).
641 * Each register is defined to be (event block length / 2). Extra divide
642 * by 8 converts bits to bytes.
643 */
644 pm1_register_byte_width = (u8)
645 ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
646
647 /*
648 * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
649 * registers. These addresses do not appear (directly) in the FADT, so it
650 * is useful to pre-calculate them from the PM1 Event Block definitions.
651 *
652 * The PM event blocks are split into two register blocks, first is the
653 * PM Status Register block, followed immediately by the PM Enable
654 * Register block. Each is of length (pm1_event_length/2)
655 *
656 * Note: The PM1A event block is required by the ACPI specification.
657 * However, the PM1B event block is optional and is rarely, if ever,
658 * used.
659 */
660
661 for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
662 source64 =
663 ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
664 fadt_pm_info_table[i].source);
665
666 if (source64->address) {
667 acpi_tb_init_generic_address(fadt_pm_info_table[i].
668 target, source64->space_id,
669 pm1_register_byte_width,
670 source64->address +
671 (fadt_pm_info_table[i].
672 register_num *
673 pm1_register_byte_width));
674 }
675 }
676}