1 /*
2 * PS3 flash memory os area.
3 *
4 * Copyright (C) 2006 Sony Computer Entertainment Inc.
5 * Copyright 2006 Sony Corp.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/kernel.h>
22 #include <linux/io.h>
23 #include <linux/workqueue.h>
24 #include <linux/fs.h>
25 #include <linux/syscalls.h>
26 #include <linux/export.h>
27 #include <linux/ctype.h>
28 #include <linux/memblock.h>
29 #include <linux/of.h>
30 #include <linux/slab.h>
31
32 #include <asm/prom.h>
33
34 #include "platform.h"
35
36 enum {
37 OS_AREA_SEGMENT_SIZE = 0X200,
38 };
39
40 enum os_area_ldr_format {
41 HEADER_LDR_FORMAT_RAW = 0,
42 HEADER_LDR_FORMAT_GZIP = 1,
43 };
44
45 #define OS_AREA_HEADER_MAGIC_NUM "cell_ext_os_area"
46
47 /**
48 * struct os_area_header - os area header segment.
49 * @magic_num: Always 'cell_ext_os_area'.
50 * @hdr_version: Header format version number.
51 * @db_area_offset: Starting segment number of other os database area.
52 * @ldr_area_offset: Starting segment number of bootloader image area.
53 * @ldr_format: HEADER_LDR_FORMAT flag.
54 * @ldr_size: Size of bootloader image in bytes.
55 *
56 * Note that the docs refer to area offsets. These are offsets in units of
57 * segments from the start of the os area (top of the header). These are
58 * better thought of as segment numbers. The os area of the os area is
59 * reserved for the os image.
60 */
61
62 struct os_area_header {
63 u8 magic_num[16];
64 u32 hdr_version;
65 u32 db_area_offset;
66 u32 ldr_area_offset;
67 u32 _reserved_1;
68 u32 ldr_format;
69 u32 ldr_size;
70 u32 _reserved_2[6];
71 };
72
73 enum os_area_boot_flag {
74 PARAM_BOOT_FLAG_GAME_OS = 0,
75 PARAM_BOOT_FLAG_OTHER_OS = 1,
76 };
77
78 enum os_area_ctrl_button {
79 PARAM_CTRL_BUTTON_O_IS_YES = 0,
80 PARAM_CTRL_BUTTON_X_IS_YES = 1,
81 };
82
83 /**
84 * struct os_area_params - os area params segment.
85 * @boot_flag: User preference of operating system, PARAM_BOOT_FLAG flag.
86 * @num_params: Number of params in this (params) segment.
87 * @rtc_diff: Difference in seconds between 1970 and the ps3 rtc value.
88 * @av_multi_out: User preference of AV output, PARAM_AV_MULTI_OUT flag.
89 * @ctrl_button: User preference of controller button config, PARAM_CTRL_BUTTON
90 * flag.
91 * @static_ip_addr: User preference of static IP address.
92 * @network_mask: User preference of static network mask.
93 * @default_gateway: User preference of static default gateway.
94 * @dns_primary: User preference of static primary dns server.
95 * @dns_secondary: User preference of static secondary dns server.
96 *
97 * The ps3 rtc maintains a read-only value that approximates seconds since
98 * 2000-01-01 00:00:00 UTC.
99 *
100 * User preference of zero for static_ip_addr means use dhcp.
101 */
102
103 struct os_area_params {
104 u32 boot_flag;
105 u32 _reserved_1[3];
106 u32 num_params;
107 u32 _reserved_2[3];
108 /* param 0 */
109 s64 rtc_diff;
110 u8 av_multi_out;
111 u8 ctrl_button;
112 u8 _reserved_3[6];
113 /* param 1 */
114 u8 static_ip_addr[4];
115 u8 network_mask[4];
116 u8 default_gateway[4];
117 u8 _reserved_4[4];
118 /* param 2 */
119 u8 dns_primary[4];
120 u8 dns_secondary[4];
121 u8 _reserved_5[8];
122 };
123
124 #define OS_AREA_DB_MAGIC_NUM "-db-"
125
126 /**
127 * struct os_area_db - Shared flash memory database.
128 * @magic_num: Always '-db-'.
129 * @version: os_area_db format version number.
130 * @index_64: byte offset of the database id index for 64 bit variables.
131 * @count_64: number of usable 64 bit index entries
132 * @index_32: byte offset of the database id index for 32 bit variables.
133 * @count_32: number of usable 32 bit index entries
134 * @index_16: byte offset of the database id index for 16 bit variables.
135 * @count_16: number of usable 16 bit index entries
136 *
137 * Flash rom storage for exclusive use by guests running in the other os lpar.
138 * The current system configuration allocates 1K (two segments) for other os
139 * use.
140 */
141
142 struct os_area_db {
143 u8 magic_num[4];
144 u16 version;
145 u16 _reserved_1;
146 u16 index_64;
147 u16 count_64;
148 u16 index_32;
149 u16 count_32;
150 u16 index_16;
151 u16 count_16;
152 u32 _reserved_2;
153 u8 _db_data[1000];
154 };
155
156 /**
157 * enum os_area_db_owner - Data owners.
158 */
159
160 enum os_area_db_owner {
161 OS_AREA_DB_OWNER_ANY = -1,
162 OS_AREA_DB_OWNER_NONE = 0,
163 OS_AREA_DB_OWNER_PROTOTYPE = 1,
164 OS_AREA_DB_OWNER_LINUX = 2,
165 OS_AREA_DB_OWNER_PETITBOOT = 3,
166 OS_AREA_DB_OWNER_MAX = 32,
167 };
168
169 enum os_area_db_key {
170 OS_AREA_DB_KEY_ANY = -1,
171 OS_AREA_DB_KEY_NONE = 0,
172 OS_AREA_DB_KEY_RTC_DIFF = 1,
173 OS_AREA_DB_KEY_VIDEO_MODE = 2,
174 OS_AREA_DB_KEY_MAX = 8,
175 };
176
177 struct os_area_db_id {
178 int owner;
179 int key;
180 };
181
182 static const struct os_area_db_id os_area_db_id_empty = {
183 .owner = OS_AREA_DB_OWNER_NONE,
184 .key = OS_AREA_DB_KEY_NONE
185 };
186
187 static const struct os_area_db_id os_area_db_id_any = {
188 .owner = OS_AREA_DB_OWNER_ANY,
189 .key = OS_AREA_DB_KEY_ANY
190 };
191
192 static const struct os_area_db_id os_area_db_id_rtc_diff = {
193 .owner = OS_AREA_DB_OWNER_LINUX,
194 .key = OS_AREA_DB_KEY_RTC_DIFF
195 };
196
197 static const struct os_area_db_id os_area_db_id_video_mode = {
198 .owner = OS_AREA_DB_OWNER_LINUX,
199 .key = OS_AREA_DB_KEY_VIDEO_MODE
200 };
201
202 #define SECONDS_FROM_1970_TO_2000 946684800LL
203
204 /**
205 * struct saved_params - Static working copies of data from the PS3 'os area'.
206 *
207 * The order of preference we use for the rtc_diff source:
208 * 1) The database value.
209 * 2) The game os value.
210 * 3) The number of seconds from 1970 to 2000.
211 */
212
213 struct saved_params {
214 unsigned int valid;
215 s64 rtc_diff;
216 unsigned int av_multi_out;
217 } static saved_params;
218
219 static struct property property_rtc_diff = {
220 .name = "linux,rtc_diff",
221 .length = sizeof(saved_params.rtc_diff),
222 .value = &saved_params.rtc_diff,
223 };
224
225 static struct property property_av_multi_out = {
226 .name = "linux,av_multi_out",
227 .length = sizeof(saved_params.av_multi_out),
228 .value = &saved_params.av_multi_out,
229 };
230
231
232 static DEFINE_MUTEX(os_area_flash_mutex);
233
234 static const struct ps3_os_area_flash_ops *os_area_flash_ops;
235
ps3_os_area_flash_register(const struct ps3_os_area_flash_ops * ops)236 void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops)
237 {
238 mutex_lock(&os_area_flash_mutex);
239 os_area_flash_ops = ops;
240 mutex_unlock(&os_area_flash_mutex);
241 }
242 EXPORT_SYMBOL_GPL(ps3_os_area_flash_register);
243
os_area_flash_read(void * buf,size_t count,loff_t pos)244 static ssize_t os_area_flash_read(void *buf, size_t count, loff_t pos)
245 {
246 ssize_t res = -ENODEV;
247
248 mutex_lock(&os_area_flash_mutex);
249 if (os_area_flash_ops)
250 res = os_area_flash_ops->read(buf, count, pos);
251 mutex_unlock(&os_area_flash_mutex);
252
253 return res;
254 }
255
os_area_flash_write(const void * buf,size_t count,loff_t pos)256 static ssize_t os_area_flash_write(const void *buf, size_t count, loff_t pos)
257 {
258 ssize_t res = -ENODEV;
259
260 mutex_lock(&os_area_flash_mutex);
261 if (os_area_flash_ops)
262 res = os_area_flash_ops->write(buf, count, pos);
263 mutex_unlock(&os_area_flash_mutex);
264
265 return res;
266 }
267
268
269 /**
270 * os_area_set_property - Add or overwrite a saved_params value to the device tree.
271 *
272 * Overwrites an existing property.
273 */
274
os_area_set_property(struct device_node * node,struct property * prop)275 static void os_area_set_property(struct device_node *node,
276 struct property *prop)
277 {
278 int result;
279 struct property *tmp = of_find_property(node, prop->name, NULL);
280
281 if (tmp) {
282 pr_debug("%s:%d found %s\n", __func__, __LINE__, prop->name);
283 prom_remove_property(node, tmp);
284 }
285
286 result = prom_add_property(node, prop);
287
288 if (result)
289 pr_debug("%s:%d prom_set_property failed\n", __func__,
290 __LINE__);
291 }
292
293 /**
294 * os_area_get_property - Get a saved_params value from the device tree.
295 *
296 */
297
os_area_get_property(struct device_node * node,struct property * prop)298 static void __init os_area_get_property(struct device_node *node,
299 struct property *prop)
300 {
301 const struct property *tmp = of_find_property(node, prop->name, NULL);
302
303 if (tmp) {
304 BUG_ON(prop->length != tmp->length);
305 memcpy(prop->value, tmp->value, prop->length);
306 } else
307 pr_debug("%s:%d not found %s\n", __func__, __LINE__,
308 prop->name);
309 }
310
dump_field(char * s,const u8 * field,int size_of_field)311 static void dump_field(char *s, const u8 *field, int size_of_field)
312 {
313 #if defined(DEBUG)
314 int i;
315
316 for (i = 0; i < size_of_field; i++)
317 s[i] = isprint(field[i]) ? field[i] : '.';
318 s[i] = 0;
319 #endif
320 }
321
322 #define dump_header(_a) _dump_header(_a, __func__, __LINE__)
_dump_header(const struct os_area_header * h,const char * func,int line)323 static void _dump_header(const struct os_area_header *h, const char *func,
324 int line)
325 {
326 char str[sizeof(h->magic_num) + 1];
327
328 dump_field(str, h->magic_num, sizeof(h->magic_num));
329 pr_debug("%s:%d: h.magic_num: '%s'\n", func, line,
330 str);
331 pr_debug("%s:%d: h.hdr_version: %u\n", func, line,
332 h->hdr_version);
333 pr_debug("%s:%d: h.db_area_offset: %u\n", func, line,
334 h->db_area_offset);
335 pr_debug("%s:%d: h.ldr_area_offset: %u\n", func, line,
336 h->ldr_area_offset);
337 pr_debug("%s:%d: h.ldr_format: %u\n", func, line,
338 h->ldr_format);
339 pr_debug("%s:%d: h.ldr_size: %xh\n", func, line,
340 h->ldr_size);
341 }
342
343 #define dump_params(_a) _dump_params(_a, __func__, __LINE__)
_dump_params(const struct os_area_params * p,const char * func,int line)344 static void _dump_params(const struct os_area_params *p, const char *func,
345 int line)
346 {
347 pr_debug("%s:%d: p.boot_flag: %u\n", func, line, p->boot_flag);
348 pr_debug("%s:%d: p.num_params: %u\n", func, line, p->num_params);
349 pr_debug("%s:%d: p.rtc_diff %lld\n", func, line, p->rtc_diff);
350 pr_debug("%s:%d: p.av_multi_out %u\n", func, line, p->av_multi_out);
351 pr_debug("%s:%d: p.ctrl_button: %u\n", func, line, p->ctrl_button);
352 pr_debug("%s:%d: p.static_ip_addr: %u.%u.%u.%u\n", func, line,
353 p->static_ip_addr[0], p->static_ip_addr[1],
354 p->static_ip_addr[2], p->static_ip_addr[3]);
355 pr_debug("%s:%d: p.network_mask: %u.%u.%u.%u\n", func, line,
356 p->network_mask[0], p->network_mask[1],
357 p->network_mask[2], p->network_mask[3]);
358 pr_debug("%s:%d: p.default_gateway: %u.%u.%u.%u\n", func, line,
359 p->default_gateway[0], p->default_gateway[1],
360 p->default_gateway[2], p->default_gateway[3]);
361 pr_debug("%s:%d: p.dns_primary: %u.%u.%u.%u\n", func, line,
362 p->dns_primary[0], p->dns_primary[1],
363 p->dns_primary[2], p->dns_primary[3]);
364 pr_debug("%s:%d: p.dns_secondary: %u.%u.%u.%u\n", func, line,
365 p->dns_secondary[0], p->dns_secondary[1],
366 p->dns_secondary[2], p->dns_secondary[3]);
367 }
368
verify_header(const struct os_area_header * header)369 static int verify_header(const struct os_area_header *header)
370 {
371 if (memcmp(header->magic_num, OS_AREA_HEADER_MAGIC_NUM,
372 sizeof(header->magic_num))) {
373 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__);
374 return -1;
375 }
376
377 if (header->hdr_version < 1) {
378 pr_debug("%s:%d hdr_version failed\n", __func__, __LINE__);
379 return -1;
380 }
381
382 if (header->db_area_offset > header->ldr_area_offset) {
383 pr_debug("%s:%d offsets failed\n", __func__, __LINE__);
384 return -1;
385 }
386
387 return 0;
388 }
389
db_verify(const struct os_area_db * db)390 static int db_verify(const struct os_area_db *db)
391 {
392 if (memcmp(db->magic_num, OS_AREA_DB_MAGIC_NUM,
393 sizeof(db->magic_num))) {
394 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__);
395 return -EINVAL;
396 }
397
398 if (db->version != 1) {
399 pr_debug("%s:%d version failed\n", __func__, __LINE__);
400 return -EINVAL;
401 }
402
403 return 0;
404 }
405
406 struct db_index {
407 uint8_t owner:5;
408 uint8_t key:3;
409 };
410
411 struct db_iterator {
412 const struct os_area_db *db;
413 struct os_area_db_id match_id;
414 struct db_index *idx;
415 struct db_index *last_idx;
416 union {
417 uint64_t *value_64;
418 uint32_t *value_32;
419 uint16_t *value_16;
420 };
421 };
422
db_align_up(unsigned int val,unsigned int size)423 static unsigned int db_align_up(unsigned int val, unsigned int size)
424 {
425 return (val + (size - 1)) & (~(size - 1));
426 }
427
428 /**
429 * db_for_each_64 - Iterator for 64 bit entries.
430 *
431 * A NULL value for id can be used to match all entries.
432 * OS_AREA_DB_OWNER_ANY and OS_AREA_DB_KEY_ANY can be used to match all.
433 */
434
db_for_each_64(const struct os_area_db * db,const struct os_area_db_id * match_id,struct db_iterator * i)435 static int db_for_each_64(const struct os_area_db *db,
436 const struct os_area_db_id *match_id, struct db_iterator *i)
437 {
438 next:
439 if (!i->db) {
440 i->db = db;
441 i->match_id = match_id ? *match_id : os_area_db_id_any;
442 i->idx = (void *)db + db->index_64;
443 i->last_idx = i->idx + db->count_64;
444 i->value_64 = (void *)db + db->index_64
445 + db_align_up(db->count_64, 8);
446 } else {
447 i->idx++;
448 i->value_64++;
449 }
450
451 if (i->idx >= i->last_idx) {
452 pr_debug("%s:%d: reached end\n", __func__, __LINE__);
453 return 0;
454 }
455
456 if (i->match_id.owner != OS_AREA_DB_OWNER_ANY
457 && i->match_id.owner != (int)i->idx->owner)
458 goto next;
459 if (i->match_id.key != OS_AREA_DB_KEY_ANY
460 && i->match_id.key != (int)i->idx->key)
461 goto next;
462
463 return 1;
464 }
465
db_delete_64(struct os_area_db * db,const struct os_area_db_id * id)466 static int db_delete_64(struct os_area_db *db, const struct os_area_db_id *id)
467 {
468 struct db_iterator i;
469
470 for (i.db = NULL; db_for_each_64(db, id, &i); ) {
471
472 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__,
473 i.idx->owner, i.idx->key,
474 (unsigned long long)*i.value_64);
475
476 i.idx->owner = 0;
477 i.idx->key = 0;
478 *i.value_64 = 0;
479 }
480 return 0;
481 }
482
db_set_64(struct os_area_db * db,const struct os_area_db_id * id,uint64_t value)483 static int db_set_64(struct os_area_db *db, const struct os_area_db_id *id,
484 uint64_t value)
485 {
486 struct db_iterator i;
487
488 pr_debug("%s:%d: (%d:%d) <= %llxh\n", __func__, __LINE__,
489 id->owner, id->key, (unsigned long long)value);
490
491 if (!id->owner || id->owner == OS_AREA_DB_OWNER_ANY
492 || id->key == OS_AREA_DB_KEY_ANY) {
493 pr_debug("%s:%d: bad id: (%d:%d)\n", __func__,
494 __LINE__, id->owner, id->key);
495 return -1;
496 }
497
498 db_delete_64(db, id);
499
500 i.db = NULL;
501 if (db_for_each_64(db, &os_area_db_id_empty, &i)) {
502
503 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__,
504 i.idx->owner, i.idx->key,
505 (unsigned long long)*i.value_64);
506
507 i.idx->owner = id->owner;
508 i.idx->key = id->key;
509 *i.value_64 = value;
510
511 pr_debug("%s:%d: set (%d:%d) <= %llxh\n", __func__, __LINE__,
512 i.idx->owner, i.idx->key,
513 (unsigned long long)*i.value_64);
514 return 0;
515 }
516 pr_debug("%s:%d: database full.\n",
517 __func__, __LINE__);
518 return -1;
519 }
520
db_get_64(const struct os_area_db * db,const struct os_area_db_id * id,uint64_t * value)521 static int db_get_64(const struct os_area_db *db,
522 const struct os_area_db_id *id, uint64_t *value)
523 {
524 struct db_iterator i;
525
526 i.db = NULL;
527 if (db_for_each_64(db, id, &i)) {
528 *value = *i.value_64;
529 pr_debug("%s:%d: found %lld\n", __func__, __LINE__,
530 (long long int)*i.value_64);
531 return 0;
532 }
533 pr_debug("%s:%d: not found\n", __func__, __LINE__);
534 return -1;
535 }
536
db_get_rtc_diff(const struct os_area_db * db,int64_t * rtc_diff)537 static int db_get_rtc_diff(const struct os_area_db *db, int64_t *rtc_diff)
538 {
539 return db_get_64(db, &os_area_db_id_rtc_diff, (uint64_t*)rtc_diff);
540 }
541
542 #define dump_db(a) _dump_db(a, __func__, __LINE__)
_dump_db(const struct os_area_db * db,const char * func,int line)543 static void _dump_db(const struct os_area_db *db, const char *func,
544 int line)
545 {
546 char str[sizeof(db->magic_num) + 1];
547
548 dump_field(str, db->magic_num, sizeof(db->magic_num));
549 pr_debug("%s:%d: db.magic_num: '%s'\n", func, line,
550 str);
551 pr_debug("%s:%d: db.version: %u\n", func, line,
552 db->version);
553 pr_debug("%s:%d: db.index_64: %u\n", func, line,
554 db->index_64);
555 pr_debug("%s:%d: db.count_64: %u\n", func, line,
556 db->count_64);
557 pr_debug("%s:%d: db.index_32: %u\n", func, line,
558 db->index_32);
559 pr_debug("%s:%d: db.count_32: %u\n", func, line,
560 db->count_32);
561 pr_debug("%s:%d: db.index_16: %u\n", func, line,
562 db->index_16);
563 pr_debug("%s:%d: db.count_16: %u\n", func, line,
564 db->count_16);
565 }
566
os_area_db_init(struct os_area_db * db)567 static void os_area_db_init(struct os_area_db *db)
568 {
569 enum {
570 HEADER_SIZE = offsetof(struct os_area_db, _db_data),
571 INDEX_64_COUNT = 64,
572 VALUES_64_COUNT = 57,
573 INDEX_32_COUNT = 64,
574 VALUES_32_COUNT = 57,
575 INDEX_16_COUNT = 64,
576 VALUES_16_COUNT = 57,
577 };
578
579 memset(db, 0, sizeof(struct os_area_db));
580
581 memcpy(db->magic_num, OS_AREA_DB_MAGIC_NUM, sizeof(db->magic_num));
582 db->version = 1;
583 db->index_64 = HEADER_SIZE;
584 db->count_64 = VALUES_64_COUNT;
585 db->index_32 = HEADER_SIZE
586 + INDEX_64_COUNT * sizeof(struct db_index)
587 + VALUES_64_COUNT * sizeof(u64);
588 db->count_32 = VALUES_32_COUNT;
589 db->index_16 = HEADER_SIZE
590 + INDEX_64_COUNT * sizeof(struct db_index)
591 + VALUES_64_COUNT * sizeof(u64)
592 + INDEX_32_COUNT * sizeof(struct db_index)
593 + VALUES_32_COUNT * sizeof(u32);
594 db->count_16 = VALUES_16_COUNT;
595
596 /* Rules to check db layout. */
597
598 BUILD_BUG_ON(sizeof(struct db_index) != 1);
599 BUILD_BUG_ON(sizeof(struct os_area_db) != 2 * OS_AREA_SEGMENT_SIZE);
600 BUILD_BUG_ON(INDEX_64_COUNT & 0x7);
601 BUILD_BUG_ON(VALUES_64_COUNT > INDEX_64_COUNT);
602 BUILD_BUG_ON(INDEX_32_COUNT & 0x7);
603 BUILD_BUG_ON(VALUES_32_COUNT > INDEX_32_COUNT);
604 BUILD_BUG_ON(INDEX_16_COUNT & 0x7);
605 BUILD_BUG_ON(VALUES_16_COUNT > INDEX_16_COUNT);
606 BUILD_BUG_ON(HEADER_SIZE
607 + INDEX_64_COUNT * sizeof(struct db_index)
608 + VALUES_64_COUNT * sizeof(u64)
609 + INDEX_32_COUNT * sizeof(struct db_index)
610 + VALUES_32_COUNT * sizeof(u32)
611 + INDEX_16_COUNT * sizeof(struct db_index)
612 + VALUES_16_COUNT * sizeof(u16)
613 > sizeof(struct os_area_db));
614 }
615
616 /**
617 * update_flash_db - Helper for os_area_queue_work_handler.
618 *
619 */
620
update_flash_db(void)621 static int update_flash_db(void)
622 {
623 const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE;
624 struct os_area_header *header;
625 ssize_t count;
626 int error;
627 loff_t pos;
628 struct os_area_db* db;
629
630 /* Read in header and db from flash. */
631
632 header = kmalloc(buf_len, GFP_KERNEL);
633 if (!header) {
634 pr_debug("%s: kmalloc failed\n", __func__);
635 return -ENOMEM;
636 }
637
638 count = os_area_flash_read(header, buf_len, 0);
639 if (count < 0) {
640 pr_debug("%s: os_area_flash_read failed %zd\n", __func__,
641 count);
642 error = count;
643 goto fail;
644 }
645
646 pos = header->db_area_offset * OS_AREA_SEGMENT_SIZE;
647 if (count < OS_AREA_SEGMENT_SIZE || verify_header(header) ||
648 count < pos) {
649 pr_debug("%s: verify_header failed\n", __func__);
650 dump_header(header);
651 error = -EINVAL;
652 goto fail;
653 }
654
655 /* Now got a good db offset and some maybe good db data. */
656
657 db = (void *)header + pos;
658
659 error = db_verify(db);
660 if (error) {
661 pr_notice("%s: Verify of flash database failed, formatting.\n",
662 __func__);
663 dump_db(db);
664 os_area_db_init(db);
665 }
666
667 /* Now got good db data. */
668
669 db_set_64(db, &os_area_db_id_rtc_diff, saved_params.rtc_diff);
670
671 count = os_area_flash_write(db, sizeof(struct os_area_db), pos);
672 if (count < sizeof(struct os_area_db)) {
673 pr_debug("%s: os_area_flash_write failed %zd\n", __func__,
674 count);
675 error = count < 0 ? count : -EIO;
676 }
677
678 fail:
679 kfree(header);
680 return error;
681 }
682
683 /**
684 * os_area_queue_work_handler - Asynchronous write handler.
685 *
686 * An asynchronous write for flash memory and the device tree. Do not
687 * call directly, use os_area_queue_work().
688 */
689
os_area_queue_work_handler(struct work_struct * work)690 static void os_area_queue_work_handler(struct work_struct *work)
691 {
692 struct device_node *node;
693 int error;
694
695 pr_debug(" -> %s:%d\n", __func__, __LINE__);
696
697 node = of_find_node_by_path("/");
698 if (node) {
699 os_area_set_property(node, &property_rtc_diff);
700 of_node_put(node);
701 } else
702 pr_debug("%s:%d of_find_node_by_path failed\n",
703 __func__, __LINE__);
704
705 error = update_flash_db();
706 if (error)
707 pr_warning("%s: Could not update FLASH ROM\n", __func__);
708
709 pr_debug(" <- %s:%d\n", __func__, __LINE__);
710 }
711
os_area_queue_work(void)712 static void os_area_queue_work(void)
713 {
714 static DECLARE_WORK(q, os_area_queue_work_handler);
715
716 wmb();
717 schedule_work(&q);
718 }
719
720 /**
721 * ps3_os_area_save_params - Copy data from os area mirror to @saved_params.
722 *
723 * For the convenience of the guest the HV makes a copy of the os area in
724 * flash to a high address in the boot memory region and then puts that RAM
725 * address and the byte count into the repository for retrieval by the guest.
726 * We copy the data we want into a static variable and allow the memory setup
727 * by the HV to be claimed by the memblock manager.
728 *
729 * The os area mirror will not be available to a second stage kernel, and
730 * the header verify will fail. In this case, the saved_params values will
731 * be set from flash memory or the passed in device tree in ps3_os_area_init().
732 */
733
ps3_os_area_save_params(void)734 void __init ps3_os_area_save_params(void)
735 {
736 int result;
737 u64 lpar_addr;
738 unsigned int size;
739 struct os_area_header *header;
740 struct os_area_params *params;
741 struct os_area_db *db;
742
743 pr_debug(" -> %s:%d\n", __func__, __LINE__);
744
745 result = ps3_repository_read_boot_dat_info(&lpar_addr, &size);
746
747 if (result) {
748 pr_debug("%s:%d ps3_repository_read_boot_dat_info failed\n",
749 __func__, __LINE__);
750 return;
751 }
752
753 header = (struct os_area_header *)__va(lpar_addr);
754 params = (struct os_area_params *)__va(lpar_addr
755 + OS_AREA_SEGMENT_SIZE);
756
757 result = verify_header(header);
758
759 if (result) {
760 /* Second stage kernels exit here. */
761 pr_debug("%s:%d verify_header failed\n", __func__, __LINE__);
762 dump_header(header);
763 return;
764 }
765
766 db = (struct os_area_db *)__va(lpar_addr
767 + header->db_area_offset * OS_AREA_SEGMENT_SIZE);
768
769 dump_header(header);
770 dump_params(params);
771 dump_db(db);
772
773 result = db_verify(db) || db_get_rtc_diff(db, &saved_params.rtc_diff);
774 if (result)
775 saved_params.rtc_diff = params->rtc_diff ? params->rtc_diff
776 : SECONDS_FROM_1970_TO_2000;
777 saved_params.av_multi_out = params->av_multi_out;
778 saved_params.valid = 1;
779
780 memset(header, 0, sizeof(*header));
781
782 pr_debug(" <- %s:%d\n", __func__, __LINE__);
783 }
784
785 /**
786 * ps3_os_area_init - Setup os area device tree properties as needed.
787 */
788
ps3_os_area_init(void)789 void __init ps3_os_area_init(void)
790 {
791 struct device_node *node;
792
793 pr_debug(" -> %s:%d\n", __func__, __LINE__);
794
795 node = of_find_node_by_path("/");
796
797 if (!saved_params.valid && node) {
798 /* Second stage kernels should have a dt entry. */
799 os_area_get_property(node, &property_rtc_diff);
800 os_area_get_property(node, &property_av_multi_out);
801 }
802
803 if(!saved_params.rtc_diff)
804 saved_params.rtc_diff = SECONDS_FROM_1970_TO_2000;
805
806 if (node) {
807 os_area_set_property(node, &property_rtc_diff);
808 os_area_set_property(node, &property_av_multi_out);
809 of_node_put(node);
810 } else
811 pr_debug("%s:%d of_find_node_by_path failed\n",
812 __func__, __LINE__);
813
814 pr_debug(" <- %s:%d\n", __func__, __LINE__);
815 }
816
817 /**
818 * ps3_os_area_get_rtc_diff - Returns the rtc diff value.
819 */
820
ps3_os_area_get_rtc_diff(void)821 u64 ps3_os_area_get_rtc_diff(void)
822 {
823 return saved_params.rtc_diff;
824 }
825 EXPORT_SYMBOL_GPL(ps3_os_area_get_rtc_diff);
826
827 /**
828 * ps3_os_area_set_rtc_diff - Set the rtc diff value.
829 *
830 * An asynchronous write is needed to support writing updates from
831 * the timer interrupt context.
832 */
833
ps3_os_area_set_rtc_diff(u64 rtc_diff)834 void ps3_os_area_set_rtc_diff(u64 rtc_diff)
835 {
836 if (saved_params.rtc_diff != rtc_diff) {
837 saved_params.rtc_diff = rtc_diff;
838 os_area_queue_work();
839 }
840 }
841 EXPORT_SYMBOL_GPL(ps3_os_area_set_rtc_diff);
842
843 /**
844 * ps3_os_area_get_av_multi_out - Returns the default video mode.
845 */
846
ps3_os_area_get_av_multi_out(void)847 enum ps3_param_av_multi_out ps3_os_area_get_av_multi_out(void)
848 {
849 return saved_params.av_multi_out;
850 }
851 EXPORT_SYMBOL_GPL(ps3_os_area_get_av_multi_out);
852