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[deliverable/linux.git] / drivers / acpi / acpica / tbfadt.c
1 /******************************************************************************
2 *
3 * Module Name: tbfadt - FADT table utilities
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "actables.h"
47
48 #define _COMPONENT ACPI_TABLES
49 ACPI_MODULE_NAME("tbfadt")
50
51 /* Local prototypes */
52 static void
53 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
54 u8 space_id,
55 u8 byte_width,
56 u64 address, const char *register_name, u8 flags);
57
58 static void acpi_tb_convert_fadt(void);
59
60 static void acpi_tb_setup_fadt_registers(void);
61
62 static u64
63 acpi_tb_select_address(char *register_name, u32 address32, u64 address64);
64
65 /* Table for conversion of FADT to common internal format and FADT validation */
66
67 typedef struct acpi_fadt_info {
68 const char *name;
69 u16 address64;
70 u16 address32;
71 u16 length;
72 u8 default_length;
73 u8 flags;
74
75 } acpi_fadt_info;
76
77 #define ACPI_FADT_OPTIONAL 0
78 #define ACPI_FADT_REQUIRED 1
79 #define ACPI_FADT_SEPARATE_LENGTH 2
80 #define ACPI_FADT_GPE_REGISTER 4
81
82 static struct acpi_fadt_info fadt_info_table[] = {
83 {"Pm1aEventBlock",
84 ACPI_FADT_OFFSET(xpm1a_event_block),
85 ACPI_FADT_OFFSET(pm1a_event_block),
86 ACPI_FADT_OFFSET(pm1_event_length),
87 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
88 ACPI_FADT_REQUIRED},
89
90 {"Pm1bEventBlock",
91 ACPI_FADT_OFFSET(xpm1b_event_block),
92 ACPI_FADT_OFFSET(pm1b_event_block),
93 ACPI_FADT_OFFSET(pm1_event_length),
94 ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
95 ACPI_FADT_OPTIONAL},
96
97 {"Pm1aControlBlock",
98 ACPI_FADT_OFFSET(xpm1a_control_block),
99 ACPI_FADT_OFFSET(pm1a_control_block),
100 ACPI_FADT_OFFSET(pm1_control_length),
101 ACPI_PM1_REGISTER_WIDTH,
102 ACPI_FADT_REQUIRED},
103
104 {"Pm1bControlBlock",
105 ACPI_FADT_OFFSET(xpm1b_control_block),
106 ACPI_FADT_OFFSET(pm1b_control_block),
107 ACPI_FADT_OFFSET(pm1_control_length),
108 ACPI_PM1_REGISTER_WIDTH,
109 ACPI_FADT_OPTIONAL},
110
111 {"Pm2ControlBlock",
112 ACPI_FADT_OFFSET(xpm2_control_block),
113 ACPI_FADT_OFFSET(pm2_control_block),
114 ACPI_FADT_OFFSET(pm2_control_length),
115 ACPI_PM2_REGISTER_WIDTH,
116 ACPI_FADT_SEPARATE_LENGTH},
117
118 {"PmTimerBlock",
119 ACPI_FADT_OFFSET(xpm_timer_block),
120 ACPI_FADT_OFFSET(pm_timer_block),
121 ACPI_FADT_OFFSET(pm_timer_length),
122 ACPI_PM_TIMER_WIDTH,
123 ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */
124
125 {"Gpe0Block",
126 ACPI_FADT_OFFSET(xgpe0_block),
127 ACPI_FADT_OFFSET(gpe0_block),
128 ACPI_FADT_OFFSET(gpe0_block_length),
129 0,
130 ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER},
131
132 {"Gpe1Block",
133 ACPI_FADT_OFFSET(xgpe1_block),
134 ACPI_FADT_OFFSET(gpe1_block),
135 ACPI_FADT_OFFSET(gpe1_block_length),
136 0,
137 ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}
138 };
139
140 #define ACPI_FADT_INFO_ENTRIES \
141 (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
142
143 /* Table used to split Event Blocks into separate status/enable registers */
144
145 typedef struct acpi_fadt_pm_info {
146 struct acpi_generic_address *target;
147 u16 source;
148 u8 register_num;
149
150 } acpi_fadt_pm_info;
151
152 static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
153 {&acpi_gbl_xpm1a_status,
154 ACPI_FADT_OFFSET(xpm1a_event_block),
155 0},
156
157 {&acpi_gbl_xpm1a_enable,
158 ACPI_FADT_OFFSET(xpm1a_event_block),
159 1},
160
161 {&acpi_gbl_xpm1b_status,
162 ACPI_FADT_OFFSET(xpm1b_event_block),
163 0},
164
165 {&acpi_gbl_xpm1b_enable,
166 ACPI_FADT_OFFSET(xpm1b_event_block),
167 1}
168 };
169
170 #define ACPI_FADT_PM_INFO_ENTRIES \
171 (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
172
173 /*******************************************************************************
174 *
175 * FUNCTION: acpi_tb_init_generic_address
176 *
177 * PARAMETERS: generic_address - GAS struct to be initialized
178 * space_id - ACPI Space ID for this register
179 * byte_width - Width of this register
180 * address - Address of the register
181 * register_name - ASCII name of the ACPI register
182 *
183 * RETURN: None
184 *
185 * DESCRIPTION: Initialize a Generic Address Structure (GAS)
186 * See the ACPI specification for a full description and
187 * definition of this structure.
188 *
189 ******************************************************************************/
190
191 static void
192 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
193 u8 space_id,
194 u8 byte_width,
195 u64 address, const char *register_name, u8 flags)
196 {
197 u8 bit_width;
198
199 /*
200 * Bit width field in the GAS is only one byte long, 255 max.
201 * Check for bit_width overflow in GAS.
202 */
203 bit_width = (u8)(byte_width * 8);
204 if (byte_width > 31) { /* (31*8)=248, (32*8)=256 */
205 /*
206 * No error for GPE blocks, because we do not use the bit_width
207 * for GPEs, the legacy length (byte_width) is used instead to
208 * allow for a large number of GPEs.
209 */
210 if (!(flags & ACPI_FADT_GPE_REGISTER)) {
211 ACPI_ERROR((AE_INFO,
212 "%s - 32-bit FADT register is too long (%u bytes, %u bits) "
213 "to convert to GAS struct - 255 bits max, truncating",
214 register_name, byte_width,
215 (byte_width * 8)));
216 }
217
218 bit_width = 255;
219 }
220
221 /*
222 * The 64-bit Address field is non-aligned in the byte packed
223 * GAS struct.
224 */
225 ACPI_MOVE_64_TO_64(&generic_address->address, &address);
226
227 /* All other fields are byte-wide */
228
229 generic_address->space_id = space_id;
230 generic_address->bit_width = bit_width;
231 generic_address->bit_offset = 0;
232 generic_address->access_width = 0; /* Access width ANY */
233 }
234
235 /*******************************************************************************
236 *
237 * FUNCTION: acpi_tb_select_address
238 *
239 * PARAMETERS: register_name - ASCII name of the ACPI register
240 * address32 - 32-bit address of the register
241 * address64 - 64-bit address of the register
242 *
243 * RETURN: The resolved 64-bit address
244 *
245 * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within
246 * the FADT. Used for the FACS and DSDT addresses.
247 *
248 * NOTES:
249 *
250 * Check for FACS and DSDT address mismatches. An address mismatch between
251 * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
252 * DSDT/X_DSDT) could be a corrupted address field or it might indicate
253 * the presence of two FACS or two DSDT tables.
254 *
255 * November 2013:
256 * By default, as per the ACPICA specification, a valid 64-bit address is
257 * used regardless of the value of the 32-bit address. However, this
258 * behavior can be overridden via the acpi_gbl_use32_bit_fadt_addresses flag.
259 *
260 ******************************************************************************/
261
262 static u64
263 acpi_tb_select_address(char *register_name, u32 address32, u64 address64)
264 {
265
266 if (!address64) {
267
268 /* 64-bit address is zero, use 32-bit address */
269
270 return ((u64)address32);
271 }
272
273 if (address32 && (address64 != (u64)address32)) {
274
275 /* Address mismatch between 32-bit and 64-bit versions */
276
277 ACPI_BIOS_WARNING((AE_INFO,
278 "32/64X %s address mismatch in FADT: "
279 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
280 register_name, address32,
281 ACPI_FORMAT_UINT64(address64),
282 acpi_gbl_use32_bit_fadt_addresses ? 32 :
283 64));
284
285 /* 32-bit address override */
286
287 if (acpi_gbl_use32_bit_fadt_addresses) {
288 return ((u64)address32);
289 }
290 }
291
292 /* Default is to use the 64-bit address */
293
294 return (address64);
295 }
296
297 /*******************************************************************************
298 *
299 * FUNCTION: acpi_tb_parse_fadt
300 *
301 * PARAMETERS: None
302 *
303 * RETURN: None
304 *
305 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
306 * (FADT contains the addresses of the DSDT and FACS)
307 *
308 ******************************************************************************/
309
310 void acpi_tb_parse_fadt(void)
311 {
312 u32 length;
313 struct acpi_table_header *table;
314
315 /*
316 * The FADT has multiple versions with different lengths,
317 * and it contains pointers to both the DSDT and FACS tables.
318 *
319 * Get a local copy of the FADT and convert it to a common format
320 * Map entire FADT, assumed to be smaller than one page.
321 */
322 length = acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index].length;
323
324 table =
325 acpi_os_map_memory(acpi_gbl_root_table_list.
326 tables[acpi_gbl_fadt_index].address, length);
327 if (!table) {
328 return;
329 }
330
331 /*
332 * Validate the FADT checksum before we copy the table. Ignore
333 * checksum error as we want to try to get the DSDT and FACS.
334 */
335 (void)acpi_tb_verify_checksum(table, length);
336
337 /* Create a local copy of the FADT in common ACPI 2.0+ format */
338
339 acpi_tb_create_local_fadt(table, length);
340
341 /* All done with the real FADT, unmap it */
342
343 acpi_os_unmap_memory(table, length);
344
345 /* Obtain the DSDT and FACS tables via their addresses within the FADT */
346
347 acpi_tb_install_fixed_table((acpi_physical_address)acpi_gbl_FADT.Xdsdt,
348 ACPI_SIG_DSDT, &acpi_gbl_dsdt_index);
349
350 /* If Hardware Reduced flag is set, there is no FACS */
351
352 if (!acpi_gbl_reduced_hardware) {
353 if (acpi_gbl_FADT.facs) {
354 acpi_tb_install_fixed_table((acpi_physical_address)
355 acpi_gbl_FADT.facs,
356 ACPI_SIG_FACS,
357 &acpi_gbl_facs_index);
358 }
359 if (acpi_gbl_FADT.Xfacs) {
360 acpi_tb_install_fixed_table((acpi_physical_address)
361 acpi_gbl_FADT.Xfacs,
362 ACPI_SIG_FACS,
363 &acpi_gbl_xfacs_index);
364 }
365 }
366 }
367
368 /*******************************************************************************
369 *
370 * FUNCTION: acpi_tb_create_local_fadt
371 *
372 * PARAMETERS: table - Pointer to BIOS FADT
373 * length - Length of the table
374 *
375 * RETURN: None
376 *
377 * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
378 * Performs validation on some important FADT fields.
379 *
380 * NOTE: We create a local copy of the FADT regardless of the version.
381 *
382 ******************************************************************************/
383
384 void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
385 {
386 /*
387 * Check if the FADT is larger than the largest table that we expect
388 * (typically the current ACPI specification version). If so, truncate
389 * the table, and issue a warning.
390 */
391 if (length > sizeof(struct acpi_table_fadt)) {
392 ACPI_BIOS_WARNING((AE_INFO,
393 "FADT (revision %u) is longer than %s length, "
394 "truncating length %u to %u",
395 table->revision, ACPI_FADT_CONFORMANCE,
396 length,
397 (u32)sizeof(struct acpi_table_fadt)));
398 }
399
400 /* Clear the entire local FADT */
401
402 memset(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
403
404 /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
405
406 memcpy(&acpi_gbl_FADT, table,
407 ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
408
409 /* Take a copy of the Hardware Reduced flag */
410
411 acpi_gbl_reduced_hardware = FALSE;
412 if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
413 acpi_gbl_reduced_hardware = TRUE;
414 }
415
416 /* Convert the local copy of the FADT to the common internal format */
417
418 acpi_tb_convert_fadt();
419
420 /* Initialize the global ACPI register structures */
421
422 acpi_tb_setup_fadt_registers();
423 }
424
425 /*******************************************************************************
426 *
427 * FUNCTION: acpi_tb_convert_fadt
428 *
429 * PARAMETERS: none - acpi_gbl_FADT is used.
430 *
431 * RETURN: None
432 *
433 * DESCRIPTION: Converts all versions of the FADT to a common internal format.
434 * Expand 32-bit addresses to 64-bit as necessary. Also validate
435 * important fields within the FADT.
436 *
437 * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must
438 * contain a copy of the actual BIOS-provided FADT.
439 *
440 * Notes on 64-bit register addresses:
441 *
442 * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
443 * fields of the FADT for all ACPI register addresses.
444 *
445 * The 64-bit X fields are optional extensions to the original 32-bit FADT
446 * V1.0 fields. Even if they are present in the FADT, they are optional and
447 * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
448 * 32-bit V1.0 fields to the 64-bit X fields if the the 64-bit X field is
449 * originally zero.
450 *
451 * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address
452 * fields are expanded to the corresponding 64-bit X fields in the internal
453 * common FADT.
454 *
455 * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
456 * to the corresponding 64-bit X fields, if the 64-bit field is originally
457 * zero. Adhering to the ACPI specification, we completely ignore the 32-bit
458 * field if the 64-bit field is valid, regardless of whether the host OS is
459 * 32-bit or 64-bit.
460 *
461 * Possible additional checks:
462 * (acpi_gbl_FADT.pm1_event_length >= 4)
463 * (acpi_gbl_FADT.pm1_control_length >= 2)
464 * (acpi_gbl_FADT.pm_timer_length >= 4)
465 * Gpe block lengths must be multiple of 2
466 *
467 ******************************************************************************/
468
469 static void acpi_tb_convert_fadt(void)
470 {
471 const char *name;
472 struct acpi_generic_address *address64;
473 u32 address32;
474 u8 length;
475 u8 flags;
476 u32 i;
477
478 /*
479 * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
480 * should be zero are indeed zero. This will workaround BIOSs that
481 * inadvertently place values in these fields.
482 *
483 * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
484 * at offset 45, 55, 95, and the word located at offset 109, 110.
485 *
486 * Note: The FADT revision value is unreliable. Only the length can be
487 * trusted.
488 */
489 if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
490 acpi_gbl_FADT.preferred_profile = 0;
491 acpi_gbl_FADT.pstate_control = 0;
492 acpi_gbl_FADT.cst_control = 0;
493 acpi_gbl_FADT.boot_flags = 0;
494 }
495
496 /*
497 * Now we can update the local FADT length to the length of the
498 * current FADT version as defined by the ACPI specification.
499 * Thus, we will have a common FADT internally.
500 */
501 acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
502
503 /*
504 * Expand the 32-bit DSDT addresses to 64-bit as necessary.
505 * Later ACPICA code will always use the X 64-bit field.
506 */
507 acpi_gbl_FADT.Xdsdt = acpi_tb_select_address("DSDT",
508 acpi_gbl_FADT.dsdt,
509 acpi_gbl_FADT.Xdsdt);
510
511 /* If Hardware Reduced flag is set, we are all done */
512
513 if (acpi_gbl_reduced_hardware) {
514 return;
515 }
516
517 /* Examine all of the 64-bit extended address fields (X fields) */
518
519 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
520 /*
521 * Get the 32-bit and 64-bit addresses, as well as the register
522 * length and register name.
523 */
524 address32 = *ACPI_ADD_PTR(u32,
525 &acpi_gbl_FADT,
526 fadt_info_table[i].address32);
527
528 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
529 &acpi_gbl_FADT,
530 fadt_info_table[i].address64);
531
532 length = *ACPI_ADD_PTR(u8,
533 &acpi_gbl_FADT,
534 fadt_info_table[i].length);
535
536 name = fadt_info_table[i].name;
537 flags = fadt_info_table[i].flags;
538
539 /*
540 * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
541 * generic address structures as necessary. Later code will always use
542 * the 64-bit address structures.
543 *
544 * November 2013:
545 * Now always use the 64-bit address if it is valid (non-zero), in
546 * accordance with the ACPI specification which states that a 64-bit
547 * address supersedes the 32-bit version. This behavior can be
548 * overridden by the acpi_gbl_use32_bit_fadt_addresses flag.
549 *
550 * During 64-bit address construction and verification,
551 * these cases are handled:
552 *
553 * Address32 zero, Address64 [don't care] - Use Address64
554 *
555 * Address32 non-zero, Address64 zero - Copy/use Address32
556 * Address32 non-zero == Address64 non-zero - Use Address64
557 * Address32 non-zero != Address64 non-zero - Warning, use Address64
558 *
559 * Override: if acpi_gbl_use32_bit_fadt_addresses is TRUE, and:
560 * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32
561 *
562 * Note: space_id is always I/O for 32-bit legacy address fields
563 */
564 if (address32) {
565 if (!address64->address) {
566
567 /* 64-bit address is zero, use 32-bit address */
568
569 acpi_tb_init_generic_address(address64,
570 ACPI_ADR_SPACE_SYSTEM_IO,
571 *ACPI_ADD_PTR(u8,
572 &acpi_gbl_FADT,
573 fadt_info_table
574 [i].
575 length),
576 (u64)address32,
577 name, flags);
578 } else if (address64->address != (u64)address32) {
579
580 /* Address mismatch */
581
582 ACPI_BIOS_WARNING((AE_INFO,
583 "32/64X address mismatch in FADT/%s: "
584 "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
585 name, address32,
586 ACPI_FORMAT_UINT64
587 (address64->address),
588 acpi_gbl_use32_bit_fadt_addresses
589 ? 32 : 64));
590
591 if (acpi_gbl_use32_bit_fadt_addresses) {
592
593 /* 32-bit address override */
594
595 acpi_tb_init_generic_address(address64,
596 ACPI_ADR_SPACE_SYSTEM_IO,
597 *ACPI_ADD_PTR
598 (u8,
599 &acpi_gbl_FADT,
600 fadt_info_table
601 [i].
602 length),
603 (u64)
604 address32,
605 name,
606 flags);
607 }
608 }
609 }
610
611 /*
612 * For each extended field, check for length mismatch between the
613 * legacy length field and the corresponding 64-bit X length field.
614 * Note: If the legacy length field is > 0xFF bits, ignore this
615 * check. (GPE registers can be larger than the 64-bit GAS structure
616 * can accomodate, 0xFF bits).
617 */
618 if (address64->address &&
619 (ACPI_MUL_8(length) <= ACPI_UINT8_MAX) &&
620 (address64->bit_width != ACPI_MUL_8(length))) {
621 ACPI_BIOS_WARNING((AE_INFO,
622 "32/64X length mismatch in FADT/%s: %u/%u",
623 name, ACPI_MUL_8(length),
624 address64->bit_width));
625 }
626
627 if (fadt_info_table[i].flags & ACPI_FADT_REQUIRED) {
628 /*
629 * Field is required (Pm1a_event, Pm1a_control).
630 * Both the address and length must be non-zero.
631 */
632 if (!address64->address || !length) {
633 ACPI_BIOS_ERROR((AE_INFO,
634 "Required FADT field %s has zero address and/or length: "
635 "0x%8.8X%8.8X/0x%X",
636 name,
637 ACPI_FORMAT_UINT64(address64->
638 address),
639 length));
640 }
641 } else if (fadt_info_table[i].flags & ACPI_FADT_SEPARATE_LENGTH) {
642 /*
643 * Field is optional (Pm2_control, GPE0, GPE1) AND has its own
644 * length field. If present, both the address and length must
645 * be valid.
646 */
647 if ((address64->address && !length) ||
648 (!address64->address && length)) {
649 ACPI_BIOS_WARNING((AE_INFO,
650 "Optional FADT field %s has valid %s but zero %s: "
651 "0x%8.8X%8.8X/0x%X", name,
652 (length ? "Length" :
653 "Address"),
654 (length ? "Address" :
655 "Length"),
656 ACPI_FORMAT_UINT64
657 (address64->address),
658 length));
659 }
660 }
661 }
662 }
663
664 /*******************************************************************************
665 *
666 * FUNCTION: acpi_tb_setup_fadt_registers
667 *
668 * PARAMETERS: None, uses acpi_gbl_FADT.
669 *
670 * RETURN: None
671 *
672 * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
673 * force FADT register definitions to their default lengths.
674 *
675 ******************************************************************************/
676
677 static void acpi_tb_setup_fadt_registers(void)
678 {
679 struct acpi_generic_address *target64;
680 struct acpi_generic_address *source64;
681 u8 pm1_register_byte_width;
682 u32 i;
683
684 /*
685 * Optionally check all register lengths against the default values and
686 * update them if they are incorrect.
687 */
688 if (acpi_gbl_use_default_register_widths) {
689 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
690 target64 =
691 ACPI_ADD_PTR(struct acpi_generic_address,
692 &acpi_gbl_FADT,
693 fadt_info_table[i].address64);
694
695 /*
696 * If a valid register (Address != 0) and the (default_length > 0)
697 * (Not a GPE register), then check the width against the default.
698 */
699 if ((target64->address) &&
700 (fadt_info_table[i].default_length > 0) &&
701 (fadt_info_table[i].default_length !=
702 target64->bit_width)) {
703 ACPI_BIOS_WARNING((AE_INFO,
704 "Invalid length for FADT/%s: %u, using default %u",
705 fadt_info_table[i].name,
706 target64->bit_width,
707 fadt_info_table[i].
708 default_length));
709
710 /* Incorrect size, set width to the default */
711
712 target64->bit_width =
713 fadt_info_table[i].default_length;
714 }
715 }
716 }
717
718 /*
719 * Get the length of the individual PM1 registers (enable and status).
720 * Each register is defined to be (event block length / 2). Extra divide
721 * by 8 converts bits to bytes.
722 */
723 pm1_register_byte_width = (u8)
724 ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
725
726 /*
727 * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
728 * registers. These addresses do not appear (directly) in the FADT, so it
729 * is useful to pre-calculate them from the PM1 Event Block definitions.
730 *
731 * The PM event blocks are split into two register blocks, first is the
732 * PM Status Register block, followed immediately by the PM Enable
733 * Register block. Each is of length (pm1_event_length/2)
734 *
735 * Note: The PM1A event block is required by the ACPI specification.
736 * However, the PM1B event block is optional and is rarely, if ever,
737 * used.
738 */
739
740 for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
741 source64 =
742 ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
743 fadt_pm_info_table[i].source);
744
745 if (source64->address) {
746 acpi_tb_init_generic_address(fadt_pm_info_table[i].
747 target, source64->space_id,
748 pm1_register_byte_width,
749 source64->address +
750 (fadt_pm_info_table[i].
751 register_num *
752 pm1_register_byte_width),
753 "PmRegisters", 0);
754 }
755 }
756 }
Linux kernel - Deliverables
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