aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/tables/tbconvrt.c
blob: 92e0c31539bec52af192cc7ba940d5d5f99bcccf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
/******************************************************************************
 *
 * Module Name: tbconvrt - ACPI Table conversion utilities
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <linux/module.h>

#include <acpi/acpi.h>
#include <acpi/actables.h>


#define _COMPONENT          ACPI_TABLES
	 ACPI_MODULE_NAME    ("tbconvrt")

/* Local prototypes */

static void
acpi_tb_init_generic_address (
	struct acpi_generic_address     *new_gas_struct,
	u8                              register_bit_width,
	acpi_physical_address           address);

static void
acpi_tb_convert_fadt1 (
	struct fadt_descriptor_rev2    *local_fadt,
	struct fadt_descriptor_rev1    *original_fadt);

static void
acpi_tb_convert_fadt2 (
	struct fadt_descriptor_rev2    *local_fadt,
	struct fadt_descriptor_rev2    *original_fadt);


u8 acpi_fadt_is_v1;
EXPORT_SYMBOL(acpi_fadt_is_v1);

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table_count
 *
 * PARAMETERS:  RSDP            - Pointer to the RSDP
 *              RSDT            - Pointer to the RSDT/XSDT
 *
 * RETURN:      The number of tables pointed to by the RSDT or XSDT.
 *
 * DESCRIPTION: Calculate the number of tables.  Automatically handles either
 *              an RSDT or XSDT.
 *
 ******************************************************************************/

u32
acpi_tb_get_table_count (
	struct rsdp_descriptor          *RSDP,
	struct acpi_table_header        *RSDT)
{
	u32                             pointer_size;


	ACPI_FUNCTION_ENTRY ();


	if (RSDP->revision < 2) {
		pointer_size = sizeof (u32);
	}
	else {
		pointer_size = sizeof (u64);
	}

	/*
	 * Determine the number of tables pointed to by the RSDT/XSDT.
	 * This is defined by the ACPI Specification to be the number of
	 * pointers contained within the RSDT/XSDT.  The size of the pointers
	 * is architecture-dependent.
	 */
	return ((RSDT->length - sizeof (struct acpi_table_header)) / pointer_size);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_convert_to_xsdt
 *
 * PARAMETERS:  table_info      - Info about the RSDT
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an RSDT to an XSDT (internal common format)
 *
 ******************************************************************************/

acpi_status
acpi_tb_convert_to_xsdt (
	struct acpi_table_desc          *table_info)
{
	acpi_size                       table_size;
	u32                             i;
	XSDT_DESCRIPTOR         *new_table;


	ACPI_FUNCTION_ENTRY ();


	/* Compute size of the converted XSDT */

	table_size = ((acpi_size) acpi_gbl_rsdt_table_count * sizeof (u64)) +
			  sizeof (struct acpi_table_header);

	/* Allocate an XSDT */

	new_table = ACPI_MEM_CALLOCATE (table_size);
	if (!new_table) {
		return (AE_NO_MEMORY);
	}

	/* Copy the header and set the length */

	ACPI_MEMCPY (new_table, table_info->pointer, sizeof (struct acpi_table_header));
	new_table->length = (u32) table_size;

	/* Copy the table pointers */

	for (i = 0; i < acpi_gbl_rsdt_table_count; i++) {
		if (acpi_gbl_RSDP->revision < 2) {
			ACPI_STORE_ADDRESS (new_table->table_offset_entry[i],
				(ACPI_CAST_PTR (struct rsdt_descriptor_rev1,
					table_info->pointer))->table_offset_entry[i]);
		}
		else {
			new_table->table_offset_entry[i] =
				(ACPI_CAST_PTR (XSDT_DESCRIPTOR,
					table_info->pointer))->table_offset_entry[i];
		}
	}

	/* Delete the original table (either mapped or in a buffer) */

	acpi_tb_delete_single_table (table_info);

	/* Point the table descriptor to the new table */

	table_info->pointer     = ACPI_CAST_PTR (struct acpi_table_header, new_table);
	table_info->length      = table_size;
	table_info->allocation  = ACPI_MEM_ALLOCATED;

	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_init_generic_address
 *
 * PARAMETERS:  new_gas_struct      - GAS struct to be initialized
 *              register_bit_width  - Width of this register
 *              Address             - Address of the register
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize a GAS structure.
 *
 ******************************************************************************/

static void
acpi_tb_init_generic_address (
	struct acpi_generic_address     *new_gas_struct,
	u8                              register_bit_width,
	acpi_physical_address           address)
{

	ACPI_STORE_ADDRESS (new_gas_struct->address, address);

	new_gas_struct->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
	new_gas_struct->register_bit_width = register_bit_width;
	new_gas_struct->register_bit_offset = 0;
	new_gas_struct->access_width    = 0;
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_convert_fadt1
 *
 * PARAMETERS:  local_fadt      - Pointer to new FADT
 *              original_fadt   - Pointer to old FADT
 *
 * RETURN:      None, populates local_fadt
 *
 * DESCRIPTION: Convert an ACPI 1.0 FADT to common internal format
 *
 ******************************************************************************/

static void
acpi_tb_convert_fadt1 (
	struct fadt_descriptor_rev2    *local_fadt,
	struct fadt_descriptor_rev1    *original_fadt)
{

	/* ACPI 1.0 FACS */
	/* The BIOS stored FADT should agree with Revision 1.0 */
	acpi_fadt_is_v1 = 1;

	/*
	 * Copy the table header and the common part of the tables.
	 *
	 * The 2.0 table is an extension of the 1.0 table, so the entire 1.0
	 * table can be copied first, then expand some fields to 64 bits.
	 */
	ACPI_MEMCPY (local_fadt, original_fadt, sizeof (struct fadt_descriptor_rev1));

	/* Convert table pointers to 64-bit fields */

	ACPI_STORE_ADDRESS (local_fadt->xfirmware_ctrl, local_fadt->V1_firmware_ctrl);
	ACPI_STORE_ADDRESS (local_fadt->Xdsdt, local_fadt->V1_dsdt);

	/*
	 * System Interrupt Model isn't used in ACPI 2.0
	 * (local_fadt->Reserved1 = 0;)
	 */

	/*
	 * This field is set by the OEM to convey the preferred power management
	 * profile to OSPM. It doesn't have any 1.0 equivalence.  Since we don't
	 * know what kind of 32-bit system this is, we will use "unspecified".
	 */
	local_fadt->prefer_PM_profile = PM_UNSPECIFIED;

	/*
	 * Processor Performance State Control. This is the value OSPM writes to
	 * the SMI_CMD register to assume processor performance state control
	 * responsibility. There isn't any equivalence in 1.0, but as many 1.x
	 * ACPI tables contain _PCT and _PSS we also keep this value, unless
	 * acpi_strict is set.
	 */
	if (acpi_strict)
		local_fadt->pstate_cnt = 0;

	/*
	 * Support for the _CST object and C States change notification.
	 * This data item hasn't any 1.0 equivalence so leave it zero.
	 */
	local_fadt->cst_cnt = 0;

	/*
	 * FADT Rev 2 was an interim FADT released between ACPI 1.0 and ACPI 2.0.
	 * It primarily adds the FADT reset mechanism.
	 */
	if ((original_fadt->revision == 2) &&
		(original_fadt->length == sizeof (struct fadt_descriptor_rev2_minus))) {
		/*
		 * Grab the entire generic address struct, plus the 1-byte reset value
		 * that immediately follows.
		 */
		ACPI_MEMCPY (&local_fadt->reset_register,
			&(ACPI_CAST_PTR (struct fadt_descriptor_rev2_minus,
				original_fadt))->reset_register,
  			sizeof (struct acpi_generic_address) + 1);
	}
	else {
		/*
		 * Since there isn't any equivalence in 1.0 and since it is highly
		 * likely that a 1.0 system has legacy support.
		 */
		local_fadt->iapc_boot_arch = BAF_LEGACY_DEVICES;
	}

	/*
	 * Convert the V1.0 block addresses to V2.0 GAS structures
	 */
	acpi_tb_init_generic_address (&local_fadt->xpm1a_evt_blk, local_fadt->pm1_evt_len,
			  (acpi_physical_address)   local_fadt->V1_pm1a_evt_blk);
	acpi_tb_init_generic_address (&local_fadt->xpm1b_evt_blk, local_fadt->pm1_evt_len,
			  (acpi_physical_address)   local_fadt->V1_pm1b_evt_blk);
	acpi_tb_init_generic_address (&local_fadt->xpm1a_cnt_blk, local_fadt->pm1_cnt_len,
			  (acpi_physical_address)   local_fadt->V1_pm1a_cnt_blk);
	acpi_tb_init_generic_address (&local_fadt->xpm1b_cnt_blk, local_fadt->pm1_cnt_len,
			  (acpi_physical_address)   local_fadt->V1_pm1b_cnt_blk);
	acpi_tb_init_generic_address (&local_fadt->xpm2_cnt_blk, local_fadt->pm2_cnt_len,
			  (acpi_physical_address)   local_fadt->V1_pm2_cnt_blk);
	acpi_tb_init_generic_address (&local_fadt->xpm_tmr_blk, local_fadt->pm_tm_len,
			  (acpi_physical_address)   local_fadt->V1_pm_tmr_blk);
	acpi_tb_init_generic_address (&local_fadt->xgpe0_blk, 0,
			  (acpi_physical_address)   local_fadt->V1_gpe0_blk);
	acpi_tb_init_generic_address (&local_fadt->xgpe1_blk, 0,
			  (acpi_physical_address)   local_fadt->V1_gpe1_blk);

	/* Create separate GAS structs for the PM1 Enable registers */

	acpi_tb_init_generic_address (&acpi_gbl_xpm1a_enable,
		 (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
		 (acpi_physical_address)
			(local_fadt->xpm1a_evt_blk.address +
			ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));

	/* PM1B is optional; leave null if not present */

	if (local_fadt->xpm1b_evt_blk.address) {
		acpi_tb_init_generic_address (&acpi_gbl_xpm1b_enable,
			 (u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
			 (acpi_physical_address)
				(local_fadt->xpm1b_evt_blk.address +
				ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
	}
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_convert_fadt2
 *
 * PARAMETERS:  local_fadt      - Pointer to new FADT
 *              original_fadt   - Pointer to old FADT
 *
 * RETURN:      None, populates local_fadt
 *
 * DESCRIPTION: Convert an ACPI 2.0 FADT to common internal format.
 *              Handles optional "X" fields.
 *
 ******************************************************************************/

static void
acpi_tb_convert_fadt2 (
	struct fadt_descriptor_rev2    *local_fadt,
	struct fadt_descriptor_rev2    *original_fadt)
{

	/* We have an ACPI 2.0 FADT but we must copy it to our local buffer */

	ACPI_MEMCPY (local_fadt, original_fadt, sizeof (struct fadt_descriptor_rev2));

	/*
	 * "X" fields are optional extensions to the original V1.0 fields, so
	 * we must selectively expand V1.0 fields if the corresponding X field
	 * is zero.
	 */
	if (!(local_fadt->xfirmware_ctrl)) {
		ACPI_STORE_ADDRESS (local_fadt->xfirmware_ctrl,
			local_fadt->V1_firmware_ctrl);
	}

	if (!(local_fadt->Xdsdt)) {
		ACPI_STORE_ADDRESS (local_fadt->Xdsdt, local_fadt->V1_dsdt);
	}

	if (!(local_fadt->xpm1a_evt_blk.address)) {
		acpi_tb_init_generic_address (&local_fadt->xpm1a_evt_blk,
			local_fadt->pm1_evt_len,
			(acpi_physical_address) local_fadt->V1_pm1a_evt_blk);
	}

	if (!(local_fadt->xpm1b_evt_blk.address)) {
		acpi_tb_init_generic_address (&local_fadt->xpm1b_evt_blk,
			local_fadt->pm1_evt_len,
			(acpi_physical_address) local_fadt->V1_pm1b_evt_blk);
	}

	if (!(local_fadt->xpm1a_cnt_blk.address)) {
		acpi_tb_init_generic_address (&local_fadt->xpm1a_cnt_blk,
			local_fadt->pm1_cnt_len,
			(acpi_physical_address) local_fadt->V1_pm1a_cnt_blk);
	}

	if (!(local_fadt->xpm1b_cnt_blk.address)) {
		acpi_tb_init_generic_address (&local_fadt->xpm1b_cnt_blk,
			local_fadt->pm1_cnt_len,
			(acpi_physical_address) local_fadt->V1_pm1b_cnt_blk);
	}

	if (!(local_fadt->xpm2_cnt_blk.address)) {
		acpi_tb_init_generic_address (&local_fadt->xpm2_cnt_blk,
			local_fadt->pm2_cnt_len,
			(acpi_physical_address) local_fadt->V1_pm2_cnt_blk);
	}

	if (!(local_fadt->xpm_tmr_blk.address)) {
		acpi_tb_init_generic_address (&local_fadt->xpm_tmr_blk,
			local_fadt->pm_tm_len,
			(acpi_physical_address) local_fadt->V1_pm_tmr_blk);
	}

	if (!(local_fadt->xgpe0_blk.address)) {
		acpi_tb_init_generic_address (&local_fadt->xgpe0_blk,
			0, (acpi_physical_address) local_fadt->V1_gpe0_blk);
	}

	if (!(local_fadt->xgpe1_blk.address)) {
		acpi_tb_init_generic_address (&local_fadt->xgpe1_blk,
			0, (acpi_physical_address) local_fadt->V1_gpe1_blk);
	}

	/* Create separate GAS structs for the PM1 Enable registers */

	acpi_tb_init_generic_address (&acpi_gbl_xpm1a_enable,
		(u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
		(acpi_physical_address)
			(local_fadt->xpm1a_evt_blk.address +
			ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));

	acpi_gbl_xpm1a_enable.address_space_id =
		local_fadt->xpm1a_evt_blk.address_space_id;

	/* PM1B is optional; leave null if not present */

	if (local_fadt->xpm1b_evt_blk.address) {
		acpi_tb_init_generic_address (&acpi_gbl_xpm1b_enable,
			(u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
			(acpi_physical_address)
				(local_fadt->xpm1b_evt_blk.address +
				ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));

		acpi_gbl_xpm1b_enable.address_space_id =
			local_fadt->xpm1b_evt_blk.address_space_id;
	}
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_convert_table_fadt
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Converts a BIOS supplied ACPI 1.0 FADT to a local
 *              ACPI 2.0 FADT. If the BIOS supplied a 2.0 FADT then it is simply
 *              copied to the local FADT.  The ACPI CA software uses this
 *              local FADT. Thus a significant amount of special #ifdef
 *              type codeing is saved.
 *
 ******************************************************************************/

acpi_status
acpi_tb_convert_table_fadt (
	void)
{
	struct fadt_descriptor_rev2    *local_fadt;
	struct acpi_table_desc         *table_desc;


	ACPI_FUNCTION_TRACE ("tb_convert_table_fadt");


	/*
	 * acpi_gbl_FADT is valid. Validate the FADT length. The table must be
	 * at least as long as the version 1.0 FADT
	 */
	if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev1)) {
		ACPI_REPORT_ERROR (("FADT is invalid, too short: 0x%X\n",
			acpi_gbl_FADT->length));
		return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
	}

	/* Allocate buffer for the ACPI 2.0(+) FADT */

	local_fadt = ACPI_MEM_CALLOCATE (sizeof (struct fadt_descriptor_rev2));
	if (!local_fadt) {
		return_ACPI_STATUS (AE_NO_MEMORY);
	}

	if (acpi_gbl_FADT->revision >= FADT2_REVISION_ID) {
		if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev2)) {
			/* Length is too short to be a V2.0 table */

			ACPI_REPORT_WARNING ((
				"Inconsistent FADT length (0x%X) and revision (0x%X), using FADT V1.0 portion of table\n",
				acpi_gbl_FADT->length, acpi_gbl_FADT->revision));

			acpi_tb_convert_fadt1 (local_fadt, (void *) acpi_gbl_FADT);
		}
		else {
			/* Valid V2.0 table */

			acpi_tb_convert_fadt2 (local_fadt, acpi_gbl_FADT);
		}
	}
	else {
		/* Valid V1.0 table */

		acpi_tb_convert_fadt1 (local_fadt, (void *) acpi_gbl_FADT);
	}

	/* Global FADT pointer will point to the new common V2.0 FADT */

	acpi_gbl_FADT = local_fadt;
	acpi_gbl_FADT->length = sizeof (FADT_DESCRIPTOR);

	/* Free the original table */

	table_desc = acpi_gbl_table_lists[ACPI_TABLE_FADT].next;
	acpi_tb_delete_single_table (table_desc);

	/* Install the new table */

	table_desc->pointer     = ACPI_CAST_PTR (struct acpi_table_header, acpi_gbl_FADT);
	table_desc->allocation  = ACPI_MEM_ALLOCATED;
	table_desc->length      = sizeof (struct fadt_descriptor_rev2);

	/* Dump the entire FADT */

	ACPI_DEBUG_PRINT ((ACPI_DB_TABLES,
		"Hex dump of common internal FADT, size %d (%X)\n",
		acpi_gbl_FADT->length, acpi_gbl_FADT->length));
	ACPI_DUMP_BUFFER ((u8 *) (acpi_gbl_FADT), acpi_gbl_FADT->length);

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_build_common_facs
 *
 * PARAMETERS:  table_info      - Info for currently installed FACS
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert ACPI 1.0 and ACPI 2.0 FACS to a common internal
 *              table format.
 *
 ******************************************************************************/

acpi_status
acpi_tb_build_common_facs (
	struct acpi_table_desc          *table_info)
{

	ACPI_FUNCTION_TRACE ("tb_build_common_facs");


	/* Absolute minimum length is 24, but the ACPI spec says 64 */

	if (acpi_gbl_FACS->length < 24) {
		ACPI_REPORT_ERROR (("Invalid FACS table length: 0x%X\n",
			acpi_gbl_FACS->length));
		return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
	}

	if (acpi_gbl_FACS->length < 64) {
		ACPI_REPORT_WARNING ((
			"FACS is shorter than the ACPI specification allows: 0x%X, using anyway\n",
			acpi_gbl_FACS->length));
	}

	/* Copy fields to the new FACS */

	acpi_gbl_common_fACS.global_lock = &(acpi_gbl_FACS->global_lock);

	if ((acpi_gbl_RSDP->revision < 2) ||
		(acpi_gbl_FACS->length < 32) ||
		(!(acpi_gbl_FACS->xfirmware_waking_vector))) {
		/* ACPI 1.0 FACS or short table or optional X_ field is zero */

		acpi_gbl_common_fACS.firmware_waking_vector = ACPI_CAST_PTR (u64,
				&(acpi_gbl_FACS->firmware_waking_vector));
		acpi_gbl_common_fACS.vector_width = 32;
	}
	else {
		/* ACPI 2.0 FACS with valid X_ field */

		acpi_gbl_common_fACS.firmware_waking_vector = &acpi_gbl_FACS->xfirmware_waking_vector;
		acpi_gbl_common_fACS.vector_width = 64;
	}

	return_ACPI_STATUS (AE_OK);
}