xref: /openbmc/linux/drivers/acpi/acpica/tbfadt.c (revision b8bb76713ec50df2f11efee386e16f93d51e1076)
1 /******************************************************************************
2  *
3  * Module Name: tbfadt   - FADT table utilities
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2008, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43 
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "actables.h"
47 
48 #define _COMPONENT          ACPI_TABLES
49 ACPI_MODULE_NAME("tbfadt")
50 
51 /* Local prototypes */
52 static inline void
53 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
54 			     u8 space_id, u8 byte_width, u64 address);
55 
56 static void acpi_tb_convert_fadt(void);
57 
58 static void acpi_tb_validate_fadt(void);
59 
60 /* Table for conversion of FADT to common internal format and FADT validation */
61 
62 typedef struct acpi_fadt_info {
63 	char *name;
64 	u8 address64;
65 	u8 address32;
66 	u8 length;
67 	u8 default_length;
68 	u8 type;
69 
70 } acpi_fadt_info;
71 
72 #define ACPI_FADT_REQUIRED          1
73 #define ACPI_FADT_SEPARATE_LENGTH   2
74 
75 static struct acpi_fadt_info fadt_info_table[] = {
76 	{"Pm1aEventBlock",
77 	 ACPI_FADT_OFFSET(xpm1a_event_block),
78 	 ACPI_FADT_OFFSET(pm1a_event_block),
79 	 ACPI_FADT_OFFSET(pm1_event_length),
80 	 ACPI_PM1_REGISTER_WIDTH * 2,	/* Enable + Status register */
81 	 ACPI_FADT_REQUIRED},
82 
83 	{"Pm1bEventBlock",
84 	 ACPI_FADT_OFFSET(xpm1b_event_block),
85 	 ACPI_FADT_OFFSET(pm1b_event_block),
86 	 ACPI_FADT_OFFSET(pm1_event_length),
87 	 ACPI_PM1_REGISTER_WIDTH * 2,	/* Enable + Status register */
88 	 0},
89 
90 	{"Pm1aControlBlock",
91 	 ACPI_FADT_OFFSET(xpm1a_control_block),
92 	 ACPI_FADT_OFFSET(pm1a_control_block),
93 	 ACPI_FADT_OFFSET(pm1_control_length),
94 	 ACPI_PM1_REGISTER_WIDTH,
95 	 ACPI_FADT_REQUIRED},
96 
97 	{"Pm1bControlBlock",
98 	 ACPI_FADT_OFFSET(xpm1b_control_block),
99 	 ACPI_FADT_OFFSET(pm1b_control_block),
100 	 ACPI_FADT_OFFSET(pm1_control_length),
101 	 ACPI_PM1_REGISTER_WIDTH,
102 	 0},
103 
104 	{"Pm2ControlBlock",
105 	 ACPI_FADT_OFFSET(xpm2_control_block),
106 	 ACPI_FADT_OFFSET(pm2_control_block),
107 	 ACPI_FADT_OFFSET(pm2_control_length),
108 	 ACPI_PM2_REGISTER_WIDTH,
109 	 ACPI_FADT_SEPARATE_LENGTH},
110 
111 	{"PmTimerBlock",
112 	 ACPI_FADT_OFFSET(xpm_timer_block),
113 	 ACPI_FADT_OFFSET(pm_timer_block),
114 	 ACPI_FADT_OFFSET(pm_timer_length),
115 	 ACPI_PM_TIMER_WIDTH,
116 	 ACPI_FADT_REQUIRED},
117 
118 	{"Gpe0Block",
119 	 ACPI_FADT_OFFSET(xgpe0_block),
120 	 ACPI_FADT_OFFSET(gpe0_block),
121 	 ACPI_FADT_OFFSET(gpe0_block_length),
122 	 0,
123 	 ACPI_FADT_SEPARATE_LENGTH},
124 
125 	{"Gpe1Block",
126 	 ACPI_FADT_OFFSET(xgpe1_block),
127 	 ACPI_FADT_OFFSET(gpe1_block),
128 	 ACPI_FADT_OFFSET(gpe1_block_length),
129 	 0,
130 	 ACPI_FADT_SEPARATE_LENGTH}
131 };
132 
133 #define ACPI_FADT_INFO_ENTRIES        (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
134 
135 /*******************************************************************************
136  *
137  * FUNCTION:    acpi_tb_init_generic_address
138  *
139  * PARAMETERS:  generic_address     - GAS struct to be initialized
140  *              byte_width          - Width of this register
141  *              Address             - Address of the register
142  *
143  * RETURN:      None
144  *
145  * DESCRIPTION: Initialize a Generic Address Structure (GAS)
146  *              See the ACPI specification for a full description and
147  *              definition of this structure.
148  *
149  ******************************************************************************/
150 
151 static inline void
152 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
153 			     u8 space_id, u8 byte_width, u64 address)
154 {
155 
156 	/*
157 	 * The 64-bit Address field is non-aligned in the byte packed
158 	 * GAS struct.
159 	 */
160 	ACPI_MOVE_64_TO_64(&generic_address->address, &address);
161 
162 	/* All other fields are byte-wide */
163 
164 	generic_address->space_id = space_id;
165 	generic_address->bit_width = (u8)ACPI_MUL_8(byte_width);
166 	generic_address->bit_offset = 0;
167 	generic_address->access_width = 0;	/* Access width ANY */
168 }
169 
170 /*******************************************************************************
171  *
172  * FUNCTION:    acpi_tb_parse_fadt
173  *
174  * PARAMETERS:  table_index         - Index for the FADT
175  *              Flags               - Flags
176  *
177  * RETURN:      None
178  *
179  * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
180  *              (FADT contains the addresses of the DSDT and FACS)
181  *
182  ******************************************************************************/
183 
184 void acpi_tb_parse_fadt(u32 table_index, u8 flags)
185 {
186 	u32 length;
187 	struct acpi_table_header *table;
188 
189 	/*
190 	 * The FADT has multiple versions with different lengths,
191 	 * and it contains pointers to both the DSDT and FACS tables.
192 	 *
193 	 * Get a local copy of the FADT and convert it to a common format
194 	 * Map entire FADT, assumed to be smaller than one page.
195 	 */
196 	length = acpi_gbl_root_table_list.tables[table_index].length;
197 
198 	table =
199 	    acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
200 			       address, length);
201 	if (!table) {
202 		return;
203 	}
204 
205 	/*
206 	 * Validate the FADT checksum before we copy the table. Ignore
207 	 * checksum error as we want to try to get the DSDT and FACS.
208 	 */
209 	(void)acpi_tb_verify_checksum(table, length);
210 
211 	/* Obtain a local copy of the FADT in common ACPI 2.0+ format */
212 
213 	acpi_tb_create_local_fadt(table, length);
214 
215 	/* All done with the real FADT, unmap it */
216 
217 	acpi_os_unmap_memory(table, length);
218 
219 	/* Obtain the DSDT and FACS tables via their addresses within the FADT */
220 
221 	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
222 			      flags, ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
223 
224 	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
225 			      flags, ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
226 }
227 
228 /*******************************************************************************
229  *
230  * FUNCTION:    acpi_tb_create_local_fadt
231  *
232  * PARAMETERS:  Table               - Pointer to BIOS FADT
233  *              Length              - Length of the table
234  *
235  * RETURN:      None
236  *
237  * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
238  *              Performs validation on some important FADT fields.
239  *
240  * NOTE:        We create a local copy of the FADT regardless of the version.
241  *
242  ******************************************************************************/
243 
244 void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
245 {
246 
247 	/*
248 	 * Check if the FADT is larger than the largest table that we expect
249 	 * (the ACPI 2.0/3.0 version). If so, truncate the table, and issue
250 	 * a warning.
251 	 */
252 	if (length > sizeof(struct acpi_table_fadt)) {
253 		ACPI_WARNING((AE_INFO,
254 			      "FADT (revision %u) is longer than ACPI 2.0 version, "
255 			      "truncating length 0x%X to 0x%zX",
256 			      table->revision, (unsigned)length,
257 			      sizeof(struct acpi_table_fadt)));
258 	}
259 
260 	/* Clear the entire local FADT */
261 
262 	ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
263 
264 	/* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
265 
266 	ACPI_MEMCPY(&acpi_gbl_FADT, table,
267 		    ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
268 
269 	/*
270 	 * 1) Convert the local copy of the FADT to the common internal format
271 	 * 2) Validate some of the important values within the FADT
272 	 */
273 	acpi_tb_convert_fadt();
274 }
275 
276 /*******************************************************************************
277  *
278  * FUNCTION:    acpi_tb_convert_fadt
279  *
280  * PARAMETERS:  None, uses acpi_gbl_FADT
281  *
282  * RETURN:      None
283  *
284  * DESCRIPTION: Converts all versions of the FADT to a common internal format.
285  *              Expand all 32-bit addresses to 64-bit.
286  *
287  * NOTE:        acpi_gbl_FADT must be of size (struct acpi_table_fadt),
288  *              and must contain a copy of the actual FADT.
289  *
290  * ACPICA will use the "X" fields of the FADT for all addresses.
291  *
292  * "X" fields are optional extensions to the original V1.0 fields. Even if
293  * they are present in the structure, they can be optionally not used by
294  * setting them to zero. Therefore, we must selectively expand V1.0 fields
295  * if the corresponding X field is zero.
296  *
297  * For ACPI 1.0 FADTs, all address fields are expanded to the corresponding
298  * "X" fields.
299  *
300  * For ACPI 2.0 FADTs, any "X" fields that are NULL are filled in by
301  * expanding the corresponding ACPI 1.0 field.
302  *
303  ******************************************************************************/
304 
305 static void acpi_tb_convert_fadt(void)
306 {
307 	u8 pm1_register_bit_width;
308 	u8 pm1_register_byte_width;
309 	struct acpi_generic_address *target64;
310 	u32 i;
311 
312 	/* Update the local FADT table header length */
313 
314 	acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
315 
316 	/*
317 	 * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
318 	 * Later code will always use the X 64-bit field. Also, check for an
319 	 * address mismatch between the 32-bit and 64-bit address fields
320 	 * (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate
321 	 * the presence of two FACS or two DSDT tables.
322 	 */
323 	if (!acpi_gbl_FADT.Xfacs) {
324 		acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
325 	} else if (acpi_gbl_FADT.facs &&
326 		   (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
327 		ACPI_WARNING((AE_INFO,
328 		    "32/64 FACS address mismatch in FADT - two FACS tables!"));
329 	}
330 
331 	if (!acpi_gbl_FADT.Xdsdt) {
332 		acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
333 	} else if (acpi_gbl_FADT.dsdt &&
334 		   (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
335 		ACPI_WARNING((AE_INFO,
336 		    "32/64 DSDT address mismatch in FADT - two DSDT tables!"));
337 	}
338 
339 	/*
340 	 * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
341 	 * should be zero are indeed zero. This will workaround BIOSs that
342 	 * inadvertently place values in these fields.
343 	 *
344 	 * The ACPI 1.0 reserved fields that will be zeroed are the bytes located at
345 	 * offset 45, 55, 95, and the word located at offset 109, 110.
346 	 */
347 	if (acpi_gbl_FADT.header.revision < FADT2_REVISION_ID) {
348 		acpi_gbl_FADT.preferred_profile = 0;
349 		acpi_gbl_FADT.pstate_control = 0;
350 		acpi_gbl_FADT.cst_control = 0;
351 		acpi_gbl_FADT.boot_flags = 0;
352 	}
353 
354 	/*
355 	 * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
356 	 * generic address structures as necessary. Later code will always use
357 	 * the 64-bit address structures.
358 	 */
359 	for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
360 		target64 =
361 		    ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
362 				 fadt_info_table[i].address64);
363 
364 		/* Expand only if the 64-bit X target is null */
365 
366 		if (!target64->address) {
367 
368 			/* The space_id is always I/O for the 32-bit legacy address fields */
369 
370 			acpi_tb_init_generic_address(target64,
371 						     ACPI_ADR_SPACE_SYSTEM_IO,
372 						     *ACPI_ADD_PTR(u8,
373 								   &acpi_gbl_FADT,
374 								   fadt_info_table
375 								   [i].length),
376 						     (u64) * ACPI_ADD_PTR(u32,
377 									  &acpi_gbl_FADT,
378 									  fadt_info_table
379 									  [i].
380 									  address32));
381 		}
382 	}
383 
384 	/* Validate FADT values now, before we make any changes */
385 
386 	acpi_tb_validate_fadt();
387 
388 	/*
389 	 * Optionally check all register lengths against the default values and
390 	 * update them if they are incorrect.
391 	 */
392 	if (acpi_gbl_use_default_register_widths) {
393 		for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
394 			target64 =
395 			    ACPI_ADD_PTR(struct acpi_generic_address,
396 					 &acpi_gbl_FADT,
397 					 fadt_info_table[i].address64);
398 
399 			/*
400 			 * If a valid register (Address != 0) and the (default_length > 0)
401 			 * (Not a GPE register), then check the width against the default.
402 			 */
403 			if ((target64->address) &&
404 			    (fadt_info_table[i].default_length > 0) &&
405 			    (fadt_info_table[i].default_length !=
406 			     target64->bit_width)) {
407 				ACPI_WARNING((AE_INFO,
408 					      "Invalid length for %s: %d, using default %d",
409 					      fadt_info_table[i].name,
410 					      target64->bit_width,
411 					      fadt_info_table[i].
412 					      default_length));
413 
414 				/* Incorrect size, set width to the default */
415 
416 				target64->bit_width =
417 				    fadt_info_table[i].default_length;
418 			}
419 		}
420 	}
421 
422 	/*
423 	 * Get the length of the individual PM1 registers (enable and status).
424 	 * Each register is defined to be (event block length / 2).
425 	 */
426 	pm1_register_bit_width =
427 	    (u8)ACPI_DIV_2(acpi_gbl_FADT.xpm1a_event_block.bit_width);
428 	pm1_register_byte_width = (u8)ACPI_DIV_8(pm1_register_bit_width);
429 
430 	/*
431 	 * Adjust the lengths of the PM1 Event Blocks so that they can be used to
432 	 * access the PM1 status register(s). Use (width / 2)
433 	 */
434 	acpi_gbl_FADT.xpm1a_event_block.bit_width = pm1_register_bit_width;
435 	acpi_gbl_FADT.xpm1b_event_block.bit_width = pm1_register_bit_width;
436 
437 	/*
438 	 * Calculate separate GAS structs for the PM1 Enable registers.
439 	 * These addresses do not appear (directly) in the FADT, so it is
440 	 * useful to calculate them once, here.
441 	 *
442 	 * The PM event blocks are split into two register blocks, first is the
443 	 * PM Status Register block, followed immediately by the PM Enable
444 	 * Register block. Each is of length (xpm1x_event_block.bit_width/2).
445 	 *
446 	 * On various systems the v2 fields (and particularly the bit widths)
447 	 * cannot be relied upon, though. Hence resort to using the v1 length
448 	 * here (and warn about the inconsistency).
449 	 */
450 	if (acpi_gbl_FADT.xpm1a_event_block.bit_width
451 	    != acpi_gbl_FADT.pm1_event_length * 8)
452 		printk(KERN_WARNING "FADT: "
453 		       "X_PM1a_EVT_BLK.bit_width (%u) does not match"
454 		       " PM1_EVT_LEN (%u)\n",
455 		       acpi_gbl_FADT.xpm1a_event_block.bit_width,
456 		       acpi_gbl_FADT.pm1_event_length);
457 
458 	/* The PM1A register block is required */
459 
460 	acpi_tb_init_generic_address(&acpi_gbl_xpm1a_enable,
461 				     acpi_gbl_FADT.xpm1a_event_block.space_id,
462 				     pm1_register_byte_width,
463 				     (acpi_gbl_FADT.xpm1a_event_block.address +
464 				      pm1_register_byte_width));
465 	/* Don't forget to copy space_id of the GAS */
466 	acpi_gbl_xpm1a_enable.space_id =
467 	    acpi_gbl_FADT.xpm1a_event_block.space_id;
468 
469 	/* The PM1B register block is optional, ignore if not present */
470 
471 	if (acpi_gbl_FADT.xpm1b_event_block.address) {
472 		if (acpi_gbl_FADT.xpm1b_event_block.bit_width
473 		    != acpi_gbl_FADT.pm1_event_length * 8)
474 			printk(KERN_WARNING "FADT: "
475 			       "X_PM1b_EVT_BLK.bit_width (%u) does not match"
476 			       " PM1_EVT_LEN (%u)\n",
477 			       acpi_gbl_FADT.xpm1b_event_block.bit_width,
478 			       acpi_gbl_FADT.pm1_event_length);
479 		acpi_tb_init_generic_address(&acpi_gbl_xpm1b_enable,
480 					     acpi_gbl_FADT.xpm1b_event_block.space_id,
481 					     pm1_register_byte_width,
482 					     (acpi_gbl_FADT.xpm1b_event_block.
483 					      address + pm1_register_byte_width));
484 		/* Don't forget to copy space_id of the GAS */
485 		acpi_gbl_xpm1b_enable.space_id =
486 		    acpi_gbl_FADT.xpm1b_event_block.space_id;
487 
488 	}
489 }
490 
491 /******************************************************************************
492  *
493  * FUNCTION:    acpi_tb_validate_fadt
494  *
495  * PARAMETERS:  Table           - Pointer to the FADT to be validated
496  *
497  * RETURN:      None
498  *
499  * DESCRIPTION: Validate various important fields within the FADT. If a problem
500  *              is found, issue a message, but no status is returned.
501  *              Used by both the table manager and the disassembler.
502  *
503  * Possible additional checks:
504  * (acpi_gbl_FADT.pm1_event_length >= 4)
505  * (acpi_gbl_FADT.pm1_control_length >= 2)
506  * (acpi_gbl_FADT.pm_timer_length >= 4)
507  * Gpe block lengths must be multiple of 2
508  *
509  ******************************************************************************/
510 
511 static void acpi_tb_validate_fadt(void)
512 {
513 	char *name;
514 	u32 *address32;
515 	struct acpi_generic_address *address64;
516 	u8 length;
517 	u32 i;
518 
519 	/*
520 	 * Check for FACS and DSDT address mismatches. An address mismatch between
521 	 * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
522 	 * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
523 	 */
524 	if (acpi_gbl_FADT.facs &&
525 	    (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
526 		ACPI_WARNING((AE_INFO,
527 			      "32/64X FACS address mismatch in FADT - "
528 			      "two FACS tables! %8.8X/%8.8X%8.8X",
529 			      acpi_gbl_FADT.facs,
530 			      ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs)));
531 	}
532 
533 	if (acpi_gbl_FADT.dsdt &&
534 	    (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
535 		ACPI_WARNING((AE_INFO,
536 			      "32/64X DSDT address mismatch in FADT - "
537 			      "two DSDT tables! %8.8X/%8.8X%8.8X",
538 			      acpi_gbl_FADT.dsdt,
539 			      ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt)));
540 	}
541 
542 	/* Examine all of the 64-bit extended address fields (X fields) */
543 
544 	for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
545 		/*
546 		 * Generate pointers to the 32-bit and 64-bit addresses, get the
547 		 * register length (width), and the register name
548 		 */
549 		address64 = ACPI_ADD_PTR(struct acpi_generic_address,
550 					 &acpi_gbl_FADT,
551 					 fadt_info_table[i].address64);
552 		address32 =
553 		    ACPI_ADD_PTR(u32, &acpi_gbl_FADT,
554 				 fadt_info_table[i].address32);
555 		length =
556 		    *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
557 				  fadt_info_table[i].length);
558 		name = fadt_info_table[i].name;
559 
560 		/*
561 		 * For each extended field, check for length mismatch between the
562 		 * legacy length field and the corresponding 64-bit X length field.
563 		 */
564 		if (address64 && (address64->bit_width != ACPI_MUL_8(length))) {
565 			ACPI_WARNING((AE_INFO,
566 				      "32/64X length mismatch in %s: %d/%d",
567 				      name, ACPI_MUL_8(length),
568 				      address64->bit_width));
569 		}
570 
571 		if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
572 			/*
573 			 * Field is required (Pm1a_event, Pm1a_control, pm_timer).
574 			 * Both the address and length must be non-zero.
575 			 */
576 			if (!address64->address || !length) {
577 				ACPI_ERROR((AE_INFO,
578 					    "Required field %s has zero address and/or length: %8.8X%8.8X/%X",
579 					    name,
580 					    ACPI_FORMAT_UINT64(address64->
581 							       address),
582 					    length));
583 			}
584 		} else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
585 			/*
586 			 * Field is optional (PM2Control, GPE0, GPE1) AND has its own
587 			 * length field. If present, both the address and length must be valid.
588 			 */
589 			if ((address64->address && !length)
590 			    || (!address64->address && length)) {
591 				ACPI_WARNING((AE_INFO,
592 					      "Optional field %s has zero address or length: %8.8X%8.8X/%X",
593 					      name,
594 					      ACPI_FORMAT_UINT64(address64->
595 								 address),
596 					      length));
597 			}
598 		}
599 
600 		/* If both 32- and 64-bit addresses are valid (non-zero), they must match */
601 
602 		if (address64->address && *address32 &&
603 		    (address64->address != (u64) * address32)) {
604 			ACPI_ERROR((AE_INFO,
605 				    "32/64X address mismatch in %s: %8.8X/%8.8X%8.8X, using 64X",
606 				    name, *address32,
607 				    ACPI_FORMAT_UINT64(address64->address)));
608 		}
609 	}
610 }
611