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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: tbfadt - FADT table utilities
5 *
6 * Copyright (C) 2000 - 2018, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12#include "actables.h"
13
14#define _COMPONENT ACPI_TABLES
15ACPI_MODULE_NAME("tbfadt")
16
17/* Local prototypes */
18static void
19acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
20 u8 space_id,
21 u8 byte_width,
22 u64 address, const char *register_name, u8 flags);
23
24static void acpi_tb_convert_fadt(void);
25
26static void acpi_tb_setup_fadt_registers(void);
27
28static u64
29acpi_tb_select_address(char *register_name, u32 address32, u64 address64);
30
31/* Table for conversion of FADT to common internal format and FADT validation */
32
33typedef struct acpi_fadt_info {
34 const char *name;
35 u16 address64;
36 u16 address32;
37 u16 length;
38 u8 default_length;
39 u8 flags;
40
41} acpi_fadt_info;
42
43#define ACPI_FADT_OPTIONAL 0
44#define ACPI_FADT_REQUIRED 1
45#define ACPI_FADT_SEPARATE_LENGTH 2
46#define ACPI_FADT_GPE_REGISTER 4
47
48static struct acpi_fadt_info fadt_info_table[] = {
49 {"Pm1aEventBlock",
50 ACPI_FADT_OFFSET(xpm1a_event_block),
51 ACPI_FADT_OFFSET(pm1a_event_block),
52 ACPI_FADT_OFFSET(pm1_event_length),
53 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
54 ACPI_FADT_REQUIRED},
55
56 {"Pm1bEventBlock",
57 ACPI_FADT_OFFSET(xpm1b_event_block),
58 ACPI_FADT_OFFSET(pm1b_event_block),
59 ACPI_FADT_OFFSET(pm1_event_length),
60 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
61 ACPI_FADT_OPTIONAL},
62
63 {"Pm1aControlBlock",
64 ACPI_FADT_OFFSET(xpm1a_control_block),
65 ACPI_FADT_OFFSET(pm1a_control_block),
66 ACPI_FADT_OFFSET(pm1_control_length),
67 ACPI_PM1_REGISTER_WIDTH,
68 ACPI_FADT_REQUIRED},
69
70 {"Pm1bControlBlock",
71 ACPI_FADT_OFFSET(xpm1b_control_block),
72 ACPI_FADT_OFFSET(pm1b_control_block),
73 ACPI_FADT_OFFSET(pm1_control_length),
74 ACPI_PM1_REGISTER_WIDTH,
75 ACPI_FADT_OPTIONAL},
76
77 {"Pm2ControlBlock",
78 ACPI_FADT_OFFSET(xpm2_control_block),
79 ACPI_FADT_OFFSET(pm2_control_block),
80 ACPI_FADT_OFFSET(pm2_control_length),
81 ACPI_PM2_REGISTER_WIDTH,
82 ACPI_FADT_SEPARATE_LENGTH},
83
84 {"PmTimerBlock",
85 ACPI_FADT_OFFSET(xpm_timer_block),
86 ACPI_FADT_OFFSET(pm_timer_block),
87 ACPI_FADT_OFFSET(pm_timer_length),
88 ACPI_PM_TIMER_WIDTH,
89 ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */
90
91 {"Gpe0Block",
92 ACPI_FADT_OFFSET(xgpe0_block),
93 ACPI_FADT_OFFSET(gpe0_block),
94 ACPI_FADT_OFFSET(gpe0_block_length),
95 0,
96 ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER},
97
98 {"Gpe1Block",
99 ACPI_FADT_OFFSET(xgpe1_block),
100 ACPI_FADT_OFFSET(gpe1_block),
101 ACPI_FADT_OFFSET(gpe1_block_length),
102 0,
103 ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}
104};
105
106#define ACPI_FADT_INFO_ENTRIES \
107 (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
108
109/* Table used to split Event Blocks into separate status/enable registers */
110
111typedef struct acpi_fadt_pm_info {
112 struct acpi_generic_address *target;
113 u16 source;
114 u8 register_num;
115
116} acpi_fadt_pm_info;
117
118static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
119 {&acpi_gbl_xpm1a_status,
120 ACPI_FADT_OFFSET(xpm1a_event_block),
121 0},
122
123 {&acpi_gbl_xpm1a_enable,
124 ACPI_FADT_OFFSET(xpm1a_event_block),
125 1},
126
127 {&acpi_gbl_xpm1b_status,
128 ACPI_FADT_OFFSET(xpm1b_event_block),
129 0},
130
131 {&acpi_gbl_xpm1b_enable,
132 ACPI_FADT_OFFSET(xpm1b_event_block),
133 1}
134};
135
136#define ACPI_FADT_PM_INFO_ENTRIES \
137 (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
138
139/*******************************************************************************
140 *
141 * FUNCTION: acpi_tb_init_generic_address
142 *
143 * PARAMETERS: generic_address - GAS struct to be initialized
144 * space_id - ACPI Space ID for this register
145 * byte_width - Width of this register
146 * address - Address of the register
147 * register_name - ASCII name of the ACPI register
148 *
149 * RETURN: None
150 *
151 * DESCRIPTION: Initialize a Generic Address Structure (GAS)
152 * See the ACPI specification for a full description and
153 * definition of this structure.
154 *
155 ******************************************************************************/
156
157static void
158acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
159 u8 space_id,
160 u8 byte_width,
161 u64 address, const char *register_name, u8 flags)
162{
163 u8 bit_width;
164
165 /*
166 * Bit width field in the GAS is only one byte long, 255 max.
167 * Check for bit_width overflow in GAS.
168 */
169 bit_width = (u8)(byte_width * 8);
170 if (byte_width > 31) { /* (31*8)=248, (32*8)=256 */
171 /*
172 * No error for GPE blocks, because we do not use the bit_width
173 * for GPEs, the legacy length (byte_width) is used instead to
174 * allow for a large number of GPEs.
175 */
176 if (!(flags & ACPI_FADT_GPE_REGISTER)) {
177 ACPI_ERROR((AE_INFO,
178 "%s - 32-bit FADT register is too long (%u bytes, %u bits) "
179 "to convert to GAS struct - 255 bits max, truncating",
180 register_name, byte_width,
181 (byte_width * 8)));
182 }
183
184 bit_width = 255;
185 }
186
187 /*
188 * The 64-bit Address field is non-aligned in the byte packed
189 * GAS struct.
190 */
191 ACPI_MOVE_64_TO_64(&generic_address->address, &address);
192
193 /* All other fields are byte-wide */
194
195 generic_address->space_id = space_id;
196 generic_address->bit_width = bit_width;
197 generic_address->bit_offset = 0;
198 generic_address->access_width = 0; /* Access width ANY */
199}
200
201/*******************************************************************************
202 *
203 * FUNCTION: acpi_tb_select_address
204 *
205 * PARAMETERS: register_name - ASCII name of the ACPI register
206 * address32 - 32-bit address of the register
207 * address64 - 64-bit address of the register
208 *
209 * RETURN: The resolved 64-bit address
210 *
211 * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within
212 * the FADT. Used for the FACS and DSDT addresses.
213 *
214 * NOTES:
215 *
216 * Check for FACS and DSDT address mismatches. An address mismatch between
217 * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
218 * DSDT/X_DSDT) could be a corrupted address field or it might indicate
219 * the presence of two FACS or two DSDT tables.
220 *
221 * November 2013:
222 * By default, as per the ACPICA specification, a valid 64-bit address is
223 * used regardless of the value of the 32-bit address. However, this
224 * behavior can be overridden via the acpi_gbl_use32_bit_fadt_addresses flag.
225 *
226 ******************************************************************************/
227
228static u64
229acpi_tb_select_address(char *register_name, u32 address32, u64 address64)
230{
231
232 if (!address64) {
233
234 /* 64-bit address is zero, use 32-bit address */
235
236 return ((u64)address32);
237 }
238
239 if (address32 && (address64 != (u64)address32)) {
240
241 /* Address mismatch between 32-bit and 64-bit versions */
242
243 ACPI_BIOS_WARNING((AE_INFO,
244 "32/64X %s address mismatch in FADT: "
245 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
246 register_name, address32,
247 ACPI_FORMAT_UINT64(address64),
248 acpi_gbl_use32_bit_fadt_addresses ? 32 :
249 64));
250
251 /* 32-bit address override */
252
253 if (acpi_gbl_use32_bit_fadt_addresses) {
254 return ((u64)address32);
255 }
256 }
257
258 /* Default is to use the 64-bit address */
259
260 return (address64);
261}
262
263/*******************************************************************************
264 *
265 * FUNCTION: acpi_tb_parse_fadt
266 *
267 * PARAMETERS: None
268 *
269 * RETURN: None
270 *
271 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
272 * (FADT contains the addresses of the DSDT and FACS)
273 *
274 ******************************************************************************/
275
276void acpi_tb_parse_fadt(void)
277{
278 u32 length;
279 struct acpi_table_header *table;
280 struct acpi_table_desc *fadt_desc;
281 acpi_status status;
282
283 /*
284 * The FADT has multiple versions with different lengths,
285 * and it contains pointers to both the DSDT and FACS tables.
286 *
287 * Get a local copy of the FADT and convert it to a common format
288 * Map entire FADT, assumed to be smaller than one page.
289 */
290 fadt_desc = &acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index];
291 status = acpi_tb_get_table(fadt_desc, &table);
292 if (ACPI_FAILURE(status)) {
293 return;
294 }
295 length = fadt_desc->length;
296
297 /*
298 * Validate the FADT checksum before we copy the table. Ignore
299 * checksum error as we want to try to get the DSDT and FACS.
300 */
301 (void)acpi_tb_verify_checksum(table, length);
302
303 /* Create a local copy of the FADT in common ACPI 2.0+ format */
304
305 acpi_tb_create_local_fadt(table, length);
306
307 /* All done with the real FADT, unmap it */
308
309 acpi_tb_put_table(fadt_desc);
310
311 /* Obtain the DSDT and FACS tables via their addresses within the FADT */
312
313 acpi_tb_install_standard_table((acpi_physical_address)acpi_gbl_FADT.
314 Xdsdt,
315 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
316 FALSE, TRUE, &acpi_gbl_dsdt_index);
317
318 /* If Hardware Reduced flag is set, there is no FACS */
319
320 if (!acpi_gbl_reduced_hardware) {
321 if (acpi_gbl_FADT.facs) {
322 acpi_tb_install_standard_table((acpi_physical_address)
323 acpi_gbl_FADT.facs,
324 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
325 FALSE, TRUE,
326 &acpi_gbl_facs_index);
327 }
328 if (acpi_gbl_FADT.Xfacs) {
329 acpi_tb_install_standard_table((acpi_physical_address)
330 acpi_gbl_FADT.Xfacs,
331 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
332 FALSE, TRUE,
333 &acpi_gbl_xfacs_index);
334 }
335 }
336}
337
338/*******************************************************************************
339 *
340 * FUNCTION: acpi_tb_create_local_fadt
341 *
342 * PARAMETERS: table - Pointer to BIOS FADT
343 * length - Length of the table
344 *
345 * RETURN: None
346 *
347 * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
348 * Performs validation on some important FADT fields.
349 *
350 * NOTE: We create a local copy of the FADT regardless of the version.
351 *
352 ******************************************************************************/
353
354void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
355{
356 /*
357 * Check if the FADT is larger than the largest table that we expect
358 * (typically the current ACPI specification version). If so, truncate
359 * the table, and issue a warning.
360 */
361 if (length > sizeof(struct acpi_table_fadt)) {
362 ACPI_BIOS_WARNING((AE_INFO,
363 "FADT (revision %u) is longer than %s length, "
364 "truncating length %u to %u",
365 table->revision, ACPI_FADT_CONFORMANCE,
366 length,
367 (u32)sizeof(struct acpi_table_fadt)));
368 }
369
370 /* Clear the entire local FADT */
371
372 memset(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
373
374 /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
375
376 memcpy(&acpi_gbl_FADT, table,
377 ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
378
379 /* Take a copy of the Hardware Reduced flag */
380
381 acpi_gbl_reduced_hardware = FALSE;
382 if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
383 acpi_gbl_reduced_hardware = TRUE;
384 }
385
386 /* Convert the local copy of the FADT to the common internal format */
387
388 acpi_tb_convert_fadt();
389
390 /* Initialize the global ACPI register structures */
391
392 acpi_tb_setup_fadt_registers();
393}
394
395/*******************************************************************************
396 *
397 * FUNCTION: acpi_tb_convert_fadt
398 *
399 * PARAMETERS: none - acpi_gbl_FADT is used.
400 *
401 * RETURN: None
402 *
403 * DESCRIPTION: Converts all versions of the FADT to a common internal format.
404 * Expand 32-bit addresses to 64-bit as necessary. Also validate
405 * important fields within the FADT.
406 *
407 * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must
408 * contain a copy of the actual BIOS-provided FADT.
409 *
410 * Notes on 64-bit register addresses:
411 *
412 * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
413 * fields of the FADT for all ACPI register addresses.
414 *
415 * The 64-bit X fields are optional extensions to the original 32-bit FADT
416 * V1.0 fields. Even if they are present in the FADT, they are optional and
417 * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
418 * 32-bit V1.0 fields to the 64-bit X fields if the 64-bit X field is originally
419 * zero.
420 *
421 * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address
422 * fields are expanded to the corresponding 64-bit X fields in the internal
423 * common FADT.
424 *
425 * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
426 * to the corresponding 64-bit X fields, if the 64-bit field is originally
427 * zero. Adhering to the ACPI specification, we completely ignore the 32-bit
428 * field if the 64-bit field is valid, regardless of whether the host OS is
429 * 32-bit or 64-bit.
430 *
431 * Possible additional checks:
432 * (acpi_gbl_FADT.pm1_event_length >= 4)
433 * (acpi_gbl_FADT.pm1_control_length >= 2)
434 * (acpi_gbl_FADT.pm_timer_length >= 4)
435 * Gpe block lengths must be multiple of 2
436 *
437 ******************************************************************************/
438
439static void acpi_tb_convert_fadt(void)
440{
441 const char *name;
442 struct acpi_generic_address *address64;
443 u32 address32;
444 u8 length;
445 u8 flags;
446 u32 i;
447
448 /*
449 * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
450 * should be zero are indeed zero. This will workaround BIOSs that
451 * inadvertently place values in these fields.
452 *
453 * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
454 * at offset 45, 55, 95, and the word located at offset 109, 110.
455 *
456 * Note: The FADT revision value is unreliable. Only the length can be
457 * trusted.
458 */
459 if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
460 acpi_gbl_FADT.preferred_profile = 0;
461 acpi_gbl_FADT.pstate_control = 0;
462 acpi_gbl_FADT.cst_control = 0;
463 acpi_gbl_FADT.boot_flags = 0;
464 }
465
466 /*
467 * Now we can update the local FADT length to the length of the
468 * current FADT version as defined by the ACPI specification.
469 * Thus, we will have a common FADT internally.
470 */
471 acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
472
473 /*
474 * Expand the 32-bit DSDT addresses to 64-bit as necessary.
475 * Later ACPICA code will always use the X 64-bit field.
476 */
477 acpi_gbl_FADT.Xdsdt = acpi_tb_select_address("DSDT",
478 acpi_gbl_FADT.dsdt,
479 acpi_gbl_FADT.Xdsdt);
480
481 /* If Hardware Reduced flag is set, we are all done */
482
483 if (acpi_gbl_reduced_hardware) {
484 return;
485 }
486
487 /* Examine all of the 64-bit extended address fields (X fields) */
488
489 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
490 /*
491 * Get the 32-bit and 64-bit addresses, as well as the register
492 * length and register name.
493 */
494 address32 = *ACPI_ADD_PTR(u32,
495 &acpi_gbl_FADT,
496 fadt_info_table[i].address32);
497
498 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
499 &acpi_gbl_FADT,
500 fadt_info_table[i].address64);
501
502 length = *ACPI_ADD_PTR(u8,
503 &acpi_gbl_FADT,
504 fadt_info_table[i].length);
505
506 name = fadt_info_table[i].name;
507 flags = fadt_info_table[i].flags;
508
509 /*
510 * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
511 * generic address structures as necessary. Later code will always use
512 * the 64-bit address structures.
513 *
514 * November 2013:
515 * Now always use the 64-bit address if it is valid (non-zero), in
516 * accordance with the ACPI specification which states that a 64-bit
517 * address supersedes the 32-bit version. This behavior can be
518 * overridden by the acpi_gbl_use32_bit_fadt_addresses flag.
519 *
520 * During 64-bit address construction and verification,
521 * these cases are handled:
522 *
523 * Address32 zero, Address64 [don't care] - Use Address64
524 *
525 * No override: if acpi_gbl_use32_bit_fadt_addresses is FALSE, and:
526 * Address32 non-zero, Address64 zero - Copy/use Address32
527 * Address32 non-zero == Address64 non-zero - Use Address64
528 * Address32 non-zero != Address64 non-zero - Warning, use Address64
529 *
530 * Override: if acpi_gbl_use32_bit_fadt_addresses is TRUE, and:
531 * Address32 non-zero, Address64 zero - Copy/use Address32
532 * Address32 non-zero == Address64 non-zero - Copy/use Address32
533 * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32
534 *
535 * Note: space_id is always I/O for 32-bit legacy address fields
536 */
537 if (address32) {
538 if (address64->address) {
539 if (address64->address != (u64)address32) {
540
541 /* Address mismatch */
542
543 ACPI_BIOS_WARNING((AE_INFO,
544 "32/64X address mismatch in FADT/%s: "
545 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
546 name, address32,
547 ACPI_FORMAT_UINT64
548 (address64->address),
549 acpi_gbl_use32_bit_fadt_addresses
550 ? 32 : 64));
551 }
552
553 /*
554 * For each extended field, check for length mismatch
555 * between the legacy length field and the corresponding
556 * 64-bit X length field.
557 * Note: If the legacy length field is > 0xFF bits, ignore
558 * this check. (GPE registers can be larger than the
559 * 64-bit GAS structure can accomodate, 0xFF bits).
560 */
561 if ((ACPI_MUL_8(length) <= ACPI_UINT8_MAX) &&
562 (address64->bit_width !=
563 ACPI_MUL_8(length))) {
564 ACPI_BIOS_WARNING((AE_INFO,
565 "32/64X length mismatch in FADT/%s: %u/%u",
566 name,
567 ACPI_MUL_8(length),
568 address64->
569 bit_width));
570 }
571 }
572
573 /*
574 * Hardware register access code always uses the 64-bit fields.
575 * So if the 64-bit field is zero or is to be overridden,
576 * initialize it with the 32-bit fields.
577 * Note that when the 32-bit address favor is specified, the
578 * 64-bit fields are always re-initialized so that
579 * access_size/bit_width/bit_offset fields can be correctly
580 * configured to the values to trigger a 32-bit compatible
581 * access mode in the hardware register access code.
582 */
583 if (!address64->address
584 || acpi_gbl_use32_bit_fadt_addresses) {
585 acpi_tb_init_generic_address(address64,
586 ACPI_ADR_SPACE_SYSTEM_IO,
587 length,
588 (u64)address32,
589 name, flags);
590 }
591 }
592
593 if (fadt_info_table[i].flags & ACPI_FADT_REQUIRED) {
594 /*
595 * Field is required (Pm1a_event, Pm1a_control).
596 * Both the address and length must be non-zero.
597 */
598 if (!address64->address || !length) {
599 ACPI_BIOS_ERROR((AE_INFO,
600 "Required FADT field %s has zero address and/or length: "
601 "0x%8.8X%8.8X/0x%X",
602 name,
603 ACPI_FORMAT_UINT64(address64->
604 address),
605 length));
606 }
607 } else if (fadt_info_table[i].flags & ACPI_FADT_SEPARATE_LENGTH) {
608 /*
609 * Field is optional (Pm2_control, GPE0, GPE1) AND has its own
610 * length field. If present, both the address and length must
611 * be valid.
612 */
613 if ((address64->address && !length) ||
614 (!address64->address && length)) {
615 ACPI_BIOS_WARNING((AE_INFO,
616 "Optional FADT field %s has valid %s but zero %s: "
617 "0x%8.8X%8.8X/0x%X", name,
618 (length ? "Length" :
619 "Address"),
620 (length ? "Address" :
621 "Length"),
622 ACPI_FORMAT_UINT64
623 (address64->address),
624 length));
625 }
626 }
627 }
628}
629
630/*******************************************************************************
631 *
632 * FUNCTION: acpi_tb_setup_fadt_registers
633 *
634 * PARAMETERS: None, uses acpi_gbl_FADT.
635 *
636 * RETURN: None
637 *
638 * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
639 * force FADT register definitions to their default lengths.
640 *
641 ******************************************************************************/
642
643static void acpi_tb_setup_fadt_registers(void)
644{
645 struct acpi_generic_address *target64;
646 struct acpi_generic_address *source64;
647 u8 pm1_register_byte_width;
648 u32 i;
649
650 /*
651 * Optionally check all register lengths against the default values and
652 * update them if they are incorrect.
653 */
654 if (acpi_gbl_use_default_register_widths) {
655 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
656 target64 =
657 ACPI_ADD_PTR(struct acpi_generic_address,
658 &acpi_gbl_FADT,
659 fadt_info_table[i].address64);
660
661 /*
662 * If a valid register (Address != 0) and the (default_length > 0)
663 * (Not a GPE register), then check the width against the default.
664 */
665 if ((target64->address) &&
666 (fadt_info_table[i].default_length > 0) &&
667 (fadt_info_table[i].default_length !=
668 target64->bit_width)) {
669 ACPI_BIOS_WARNING((AE_INFO,
670 "Invalid length for FADT/%s: %u, using default %u",
671 fadt_info_table[i].name,
672 target64->bit_width,
673 fadt_info_table[i].
674 default_length));
675
676 /* Incorrect size, set width to the default */
677
678 target64->bit_width =
679 fadt_info_table[i].default_length;
680 }
681 }
682 }
683
684 /*
685 * Get the length of the individual PM1 registers (enable and status).
686 * Each register is defined to be (event block length / 2). Extra divide
687 * by 8 converts bits to bytes.
688 */
689 pm1_register_byte_width = (u8)
690 ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
691
692 /*
693 * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
694 * registers. These addresses do not appear (directly) in the FADT, so it
695 * is useful to pre-calculate them from the PM1 Event Block definitions.
696 *
697 * The PM event blocks are split into two register blocks, first is the
698 * PM Status Register block, followed immediately by the PM Enable
699 * Register block. Each is of length (pm1_event_length/2)
700 *
701 * Note: The PM1A event block is required by the ACPI specification.
702 * However, the PM1B event block is optional and is rarely, if ever,
703 * used.
704 */
705
706 for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
707 source64 =
708 ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
709 fadt_pm_info_table[i].source);
710
711 if (source64->address) {
712 acpi_tb_init_generic_address(fadt_pm_info_table[i].
713 target, source64->space_id,
714 pm1_register_byte_width,
715 source64->address +
716 (fadt_pm_info_table[i].
717 register_num *
718 pm1_register_byte_width),
719 "PmRegisters", 0);
720 }
721 }
722}