ACPICA: Update all ACPICA copyrights and signons to 2010
[linux-3.10.git] / drivers / acpi / acpica / tbfadt.c
1 /******************************************************************************
2  *
3  * Module Name: tbfadt   - FADT table utilities
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2010, 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 static void acpi_tb_setup_fadt_registers(void);
61
62 /* Table for conversion of FADT to common internal format and FADT validation */
63
64 typedef 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
77 static 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
140 typedef 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
147 static 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
184 static inline void
185 acpi_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
216 void 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
276 void 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 0x%X to 0x%X",
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
347 static 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         if (acpi_gbl_FADT.header.revision < FADT2_REVISION_ID) {
389                 acpi_gbl_FADT.preferred_profile = 0;
390                 acpi_gbl_FADT.pstate_control = 0;
391                 acpi_gbl_FADT.cst_control = 0;
392                 acpi_gbl_FADT.boot_flags = 0;
393         }
394
395         /*
396          * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
397          * generic address structures as necessary. Later code will always use
398          * the 64-bit address structures.
399          *
400          * March 2009:
401          * We now always use the 32-bit address if it is valid (non-null). This
402          * is not in accordance with the ACPI specification which states that
403          * the 64-bit address supersedes the 32-bit version, but we do this for
404          * compatibility with other ACPI implementations. Most notably, in the
405          * case where both the 32 and 64 versions are non-null, we use the 32-bit
406          * version. This is the only address that is guaranteed to have been
407          * tested by the BIOS manufacturer.
408          */
409         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
410                 address32 = *ACPI_ADD_PTR(u32,
411                                           &acpi_gbl_FADT,
412                                           fadt_info_table[i].address32);
413
414                 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
415                                          &acpi_gbl_FADT,
416                                          fadt_info_table[i].address64);
417
418                 /*
419                  * If both 32- and 64-bit addresses are valid (non-zero),
420                  * they must match.
421                  */
422                 if (address64->address && address32 &&
423                     (address64->address != (u64) address32)) {
424                         ACPI_ERROR((AE_INFO,
425                                     "32/64X address mismatch in %s: %8.8X/%8.8X%8.8X, using 32",
426                                     fadt_info_table[i].name, address32,
427                                     ACPI_FORMAT_UINT64(address64->address)));
428                 }
429
430                 /* Always use 32-bit address if it is valid (non-null) */
431
432                 if (address32) {
433                         /*
434                          * Copy the 32-bit address to the 64-bit GAS structure. The
435                          * Space ID is always I/O for 32-bit legacy address fields
436                         */
437                         acpi_tb_init_generic_address(address64,
438                                                      ACPI_ADR_SPACE_SYSTEM_IO,
439                                                      *ACPI_ADD_PTR(u8,
440                                                                    &acpi_gbl_FADT,
441                                                                    fadt_info_table
442                                                                    [i].length),
443                                                      (u64) address32);
444                 }
445         }
446 }
447
448 /*******************************************************************************
449  *
450  * FUNCTION:    acpi_tb_validate_fadt
451  *
452  * PARAMETERS:  Table           - Pointer to the FADT to be validated
453  *
454  * RETURN:      None
455  *
456  * DESCRIPTION: Validate various important fields within the FADT. If a problem
457  *              is found, issue a message, but no status is returned.
458  *              Used by both the table manager and the disassembler.
459  *
460  * Possible additional checks:
461  * (acpi_gbl_FADT.pm1_event_length >= 4)
462  * (acpi_gbl_FADT.pm1_control_length >= 2)
463  * (acpi_gbl_FADT.pm_timer_length >= 4)
464  * Gpe block lengths must be multiple of 2
465  *
466  ******************************************************************************/
467
468 static void acpi_tb_validate_fadt(void)
469 {
470         char *name;
471         struct acpi_generic_address *address64;
472         u8 length;
473         u32 i;
474
475         /*
476          * Check for FACS and DSDT address mismatches. An address mismatch between
477          * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
478          * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
479          */
480         if (acpi_gbl_FADT.facs &&
481             (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
482                 ACPI_WARNING((AE_INFO,
483                               "32/64X FACS address mismatch in FADT - "
484                               "%8.8X/%8.8X%8.8X, using 32",
485                               acpi_gbl_FADT.facs,
486                               ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs)));
487
488                 acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
489         }
490
491         if (acpi_gbl_FADT.dsdt &&
492             (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
493                 ACPI_WARNING((AE_INFO,
494                               "32/64X DSDT address mismatch in FADT - "
495                               "%8.8X/%8.8X%8.8X, using 32",
496                               acpi_gbl_FADT.dsdt,
497                               ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt)));
498
499                 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
500         }
501
502         /* Examine all of the 64-bit extended address fields (X fields) */
503
504         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
505                 /*
506                  * Generate pointer to the 64-bit address, get the register
507                  * length (width) and the register name
508                  */
509                 address64 = ACPI_ADD_PTR(struct acpi_generic_address,
510                                          &acpi_gbl_FADT,
511                                          fadt_info_table[i].address64);
512                 length =
513                     *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
514                                   fadt_info_table[i].length);
515                 name = fadt_info_table[i].name;
516
517                 /*
518                  * For each extended field, check for length mismatch between the
519                  * legacy length field and the corresponding 64-bit X length field.
520                  */
521                 if (address64->address &&
522                     (address64->bit_width != ACPI_MUL_8(length))) {
523                         ACPI_WARNING((AE_INFO,
524                                       "32/64X length mismatch in %s: %d/%d",
525                                       name, ACPI_MUL_8(length),
526                                       address64->bit_width));
527                 }
528
529                 if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
530                         /*
531                          * Field is required (Pm1a_event, Pm1a_control, pm_timer).
532                          * Both the address and length must be non-zero.
533                          */
534                         if (!address64->address || !length) {
535                                 ACPI_ERROR((AE_INFO,
536                                             "Required field %s has zero address and/or length:"
537                                             " %8.8X%8.8X/%X",
538                                             name,
539                                             ACPI_FORMAT_UINT64(address64->
540                                                                address),
541                                             length));
542                         }
543                 } else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
544                         /*
545                          * Field is optional (PM2Control, GPE0, GPE1) AND has its own
546                          * length field. If present, both the address and length must
547                          * be valid.
548                          */
549                         if ((address64->address && !length) ||
550                             (!address64->address && length)) {
551                                 ACPI_WARNING((AE_INFO,
552                                               "Optional field %s has zero address or length: "
553                                               "%8.8X%8.8X/%X",
554                                               name,
555                                               ACPI_FORMAT_UINT64(address64->
556                                                                  address),
557                                               length));
558                         }
559                 }
560         }
561 }
562
563 /*******************************************************************************
564  *
565  * FUNCTION:    acpi_tb_setup_fadt_registers
566  *
567  * PARAMETERS:  None, uses acpi_gbl_FADT.
568  *
569  * RETURN:      None
570  *
571  * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
572  *              force FADT register definitions to their default lengths.
573  *
574  ******************************************************************************/
575
576 static void acpi_tb_setup_fadt_registers(void)
577 {
578         struct acpi_generic_address *target64;
579         struct acpi_generic_address *source64;
580         u8 pm1_register_byte_width;
581         u32 i;
582
583         /*
584          * Optionally check all register lengths against the default values and
585          * update them if they are incorrect.
586          */
587         if (acpi_gbl_use_default_register_widths) {
588                 for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
589                         target64 =
590                             ACPI_ADD_PTR(struct acpi_generic_address,
591                                          &acpi_gbl_FADT,
592                                          fadt_info_table[i].address64);
593
594                         /*
595                          * If a valid register (Address != 0) and the (default_length > 0)
596                          * (Not a GPE register), then check the width against the default.
597                          */
598                         if ((target64->address) &&
599                             (fadt_info_table[i].default_length > 0) &&
600                             (fadt_info_table[i].default_length !=
601                              target64->bit_width)) {
602                                 ACPI_WARNING((AE_INFO,
603                                               "Invalid length for %s: %d, using default %d",
604                                               fadt_info_table[i].name,
605                                               target64->bit_width,
606                                               fadt_info_table[i].
607                                               default_length));
608
609                                 /* Incorrect size, set width to the default */
610
611                                 target64->bit_width =
612                                     fadt_info_table[i].default_length;
613                         }
614                 }
615         }
616
617         /*
618          * Get the length of the individual PM1 registers (enable and status).
619          * Each register is defined to be (event block length / 2). Extra divide
620          * by 8 converts bits to bytes.
621          */
622         pm1_register_byte_width = (u8)
623             ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
624
625         /*
626          * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
627          * registers. These addresses do not appear (directly) in the FADT, so it
628          * is useful to pre-calculate them from the PM1 Event Block definitions.
629          *
630          * The PM event blocks are split into two register blocks, first is the
631          * PM Status Register block, followed immediately by the PM Enable
632          * Register block. Each is of length (pm1_event_length/2)
633          *
634          * Note: The PM1A event block is required by the ACPI specification.
635          * However, the PM1B event block is optional and is rarely, if ever,
636          * used.
637          */
638
639         for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
640                 source64 =
641                     ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
642                                  fadt_pm_info_table[i].source);
643
644                 if (source64->address) {
645                         acpi_tb_init_generic_address(fadt_pm_info_table[i].
646                                                      target, source64->space_id,
647                                                      pm1_register_byte_width,
648                                                      source64->address +
649                                                      (fadt_pm_info_table[i].
650                                                       register_num *
651                                                       pm1_register_byte_width));
652                 }
653         }
654 }