1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * PS3 flash memory os area.
4 *
5 * Copyright (C) 2006 Sony Computer Entertainment Inc.
6 * Copyright 2006 Sony Corp.
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/io.h>
11 #include <linux/workqueue.h>
12 #include <linux/fs.h>
13 #include <linux/syscalls.h>
14 #include <linux/export.h>
15 #include <linux/ctype.h>
16 #include <linux/memblock.h>
17 #include <linux/of.h>
18 #include <linux/slab.h>
19
20 #include "platform.h"
21
22 enum {
23 OS_AREA_SEGMENT_SIZE = 0X200,
24 };
25
26 enum os_area_ldr_format {
27 HEADER_LDR_FORMAT_RAW = 0,
28 HEADER_LDR_FORMAT_GZIP = 1,
29 };
30
31 #define OS_AREA_HEADER_MAGIC_NUM "cell_ext_os_area"
32
33 /**
34 * struct os_area_header - os area header segment.
35 * @magic_num: Always 'cell_ext_os_area'.
36 * @hdr_version: Header format version number.
37 * @db_area_offset: Starting segment number of other os database area.
38 * @ldr_area_offset: Starting segment number of bootloader image area.
39 * @ldr_format: HEADER_LDR_FORMAT flag.
40 * @ldr_size: Size of bootloader image in bytes.
41 *
42 * Note that the docs refer to area offsets. These are offsets in units of
43 * segments from the start of the os area (top of the header). These are
44 * better thought of as segment numbers. The os area of the os area is
45 * reserved for the os image.
46 */
47
48 struct os_area_header {
49 u8 magic_num[16];
50 u32 hdr_version;
51 u32 db_area_offset;
52 u32 ldr_area_offset;
53 u32 _reserved_1;
54 u32 ldr_format;
55 u32 ldr_size;
56 u32 _reserved_2[6];
57 };
58
59 enum os_area_boot_flag {
60 PARAM_BOOT_FLAG_GAME_OS = 0,
61 PARAM_BOOT_FLAG_OTHER_OS = 1,
62 };
63
64 enum os_area_ctrl_button {
65 PARAM_CTRL_BUTTON_O_IS_YES = 0,
66 PARAM_CTRL_BUTTON_X_IS_YES = 1,
67 };
68
69 /**
70 * struct os_area_params - os area params segment.
71 * @boot_flag: User preference of operating system, PARAM_BOOT_FLAG flag.
72 * @num_params: Number of params in this (params) segment.
73 * @rtc_diff: Difference in seconds between 1970 and the ps3 rtc value.
74 * @av_multi_out: User preference of AV output, PARAM_AV_MULTI_OUT flag.
75 * @ctrl_button: User preference of controller button config, PARAM_CTRL_BUTTON
76 * flag.
77 * @static_ip_addr: User preference of static IP address.
78 * @network_mask: User preference of static network mask.
79 * @default_gateway: User preference of static default gateway.
80 * @dns_primary: User preference of static primary dns server.
81 * @dns_secondary: User preference of static secondary dns server.
82 *
83 * The ps3 rtc maintains a read-only value that approximates seconds since
84 * 2000-01-01 00:00:00 UTC.
85 *
86 * User preference of zero for static_ip_addr means use dhcp.
87 */
88
89 struct os_area_params {
90 u32 boot_flag;
91 u32 _reserved_1[3];
92 u32 num_params;
93 u32 _reserved_2[3];
94 /* param 0 */
95 s64 rtc_diff;
96 u8 av_multi_out;
97 u8 ctrl_button;
98 u8 _reserved_3[6];
99 /* param 1 */
100 u8 static_ip_addr[4];
101 u8 network_mask[4];
102 u8 default_gateway[4];
103 u8 _reserved_4[4];
104 /* param 2 */
105 u8 dns_primary[4];
106 u8 dns_secondary[4];
107 u8 _reserved_5[8];
108 };
109
110 #define OS_AREA_DB_MAGIC_NUM "-db-"
111
112 /**
113 * struct os_area_db - Shared flash memory database.
114 * @magic_num: Always '-db-'.
115 * @version: os_area_db format version number.
116 * @index_64: byte offset of the database id index for 64 bit variables.
117 * @count_64: number of usable 64 bit index entries
118 * @index_32: byte offset of the database id index for 32 bit variables.
119 * @count_32: number of usable 32 bit index entries
120 * @index_16: byte offset of the database id index for 16 bit variables.
121 * @count_16: number of usable 16 bit index entries
122 *
123 * Flash rom storage for exclusive use by guests running in the other os lpar.
124 * The current system configuration allocates 1K (two segments) for other os
125 * use.
126 */
127
128 struct os_area_db {
129 u8 magic_num[4];
130 u16 version;
131 u16 _reserved_1;
132 u16 index_64;
133 u16 count_64;
134 u16 index_32;
135 u16 count_32;
136 u16 index_16;
137 u16 count_16;
138 u32 _reserved_2;
139 u8 _db_data[1000];
140 };
141
142 /**
143 * enum os_area_db_owner - Data owners.
144 */
145
146 enum os_area_db_owner {
147 OS_AREA_DB_OWNER_ANY = -1,
148 OS_AREA_DB_OWNER_NONE = 0,
149 OS_AREA_DB_OWNER_PROTOTYPE = 1,
150 OS_AREA_DB_OWNER_LINUX = 2,
151 OS_AREA_DB_OWNER_PETITBOOT = 3,
152 OS_AREA_DB_OWNER_MAX = 32,
153 };
154
155 enum os_area_db_key {
156 OS_AREA_DB_KEY_ANY = -1,
157 OS_AREA_DB_KEY_NONE = 0,
158 OS_AREA_DB_KEY_RTC_DIFF = 1,
159 OS_AREA_DB_KEY_VIDEO_MODE = 2,
160 OS_AREA_DB_KEY_MAX = 8,
161 };
162
163 struct os_area_db_id {
164 int owner;
165 int key;
166 };
167
168 static const struct os_area_db_id os_area_db_id_empty = {
169 .owner = OS_AREA_DB_OWNER_NONE,
170 .key = OS_AREA_DB_KEY_NONE
171 };
172
173 static const struct os_area_db_id os_area_db_id_any = {
174 .owner = OS_AREA_DB_OWNER_ANY,
175 .key = OS_AREA_DB_KEY_ANY
176 };
177
178 static const struct os_area_db_id os_area_db_id_rtc_diff = {
179 .owner = OS_AREA_DB_OWNER_LINUX,
180 .key = OS_AREA_DB_KEY_RTC_DIFF
181 };
182
183 #define SECONDS_FROM_1970_TO_2000 946684800LL
184
185 /**
186 * struct saved_params - Static working copies of data from the PS3 'os area'.
187 *
188 * The order of preference we use for the rtc_diff source:
189 * 1) The database value.
190 * 2) The game os value.
191 * 3) The number of seconds from 1970 to 2000.
192 */
193
194 static struct saved_params {
195 unsigned int valid;
196 s64 rtc_diff;
197 unsigned int av_multi_out;
198 } saved_params;
199
200 static struct property property_rtc_diff = {
201 .name = "linux,rtc_diff",
202 .length = sizeof(saved_params.rtc_diff),
203 .value = &saved_params.rtc_diff,
204 };
205
206 static struct property property_av_multi_out = {
207 .name = "linux,av_multi_out",
208 .length = sizeof(saved_params.av_multi_out),
209 .value = &saved_params.av_multi_out,
210 };
211
212
213 static DEFINE_MUTEX(os_area_flash_mutex);
214
215 static const struct ps3_os_area_flash_ops *os_area_flash_ops;
216
217 void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops)
218 {
219 mutex_lock(&os_area_flash_mutex);
220 os_area_flash_ops = ops;
221 mutex_unlock(&os_area_flash_mutex);
222 }
223 EXPORT_SYMBOL_GPL(ps3_os_area_flash_register);
224
225 static ssize_t os_area_flash_read(void *buf, size_t count, loff_t pos)
226 {
227 ssize_t res = -ENODEV;
228
229 mutex_lock(&os_area_flash_mutex);
230 if (os_area_flash_ops)
231 res = os_area_flash_ops->read(buf, count, pos);
232 mutex_unlock(&os_area_flash_mutex);
233
234 return res;
235 }
236
237 static ssize_t os_area_flash_write(const void *buf, size_t count, loff_t pos)
238 {
239 ssize_t res = -ENODEV;
240
241 mutex_lock(&os_area_flash_mutex);
242 if (os_area_flash_ops)
243 res = os_area_flash_ops->write(buf, count, pos);
244 mutex_unlock(&os_area_flash_mutex);
245
246 return res;
247 }
248
249
250 /**
251 * os_area_set_property - Add or overwrite a saved_params value to the device tree.
252 *
253 * Overwrites an existing property.
254 */
255
256 static void os_area_set_property(struct device_node *node,
257 struct property *prop)
258 {
259 int result;
260 struct property *tmp = of_find_property(node, prop->name, NULL);
261
262 if (tmp) {
263 pr_debug("%s:%d found %s\n", __func__, __LINE__, prop->name);
264 of_remove_property(node, tmp);
265 }
266
267 result = of_add_property(node, prop);
268
269 if (result)
270 pr_debug("%s:%d of_set_property failed\n", __func__,
271 __LINE__);
272 }
273
274 /**
275 * os_area_get_property - Get a saved_params value from the device tree.
276 *
277 */
278
279 static void __init os_area_get_property(struct device_node *node,
280 struct property *prop)
281 {
282 const struct property *tmp = of_find_property(node, prop->name, NULL);
283
284 if (tmp) {
285 BUG_ON(prop->length != tmp->length);
286 memcpy(prop->value, tmp->value, prop->length);
287 } else
288 pr_debug("%s:%d not found %s\n", __func__, __LINE__,
289 prop->name);
290 }
291
292 static void dump_field(char *s, const u8 *field, int size_of_field)
293 {
294 #if defined(DEBUG)
295 int i;
296
297 for (i = 0; i < size_of_field; i++)
298 s[i] = isprint(field[i]) ? field[i] : '.';
299 s[i] = 0;
300 #endif
301 }
302
303 #define dump_header(_a) _dump_header(_a, __func__, __LINE__)
304 static void _dump_header(const struct os_area_header *h, const char *func,
305 int line)
306 {
307 char str[sizeof(h->magic_num) + 1];
308
309 dump_field(str, h->magic_num, sizeof(h->magic_num));
310 pr_debug("%s:%d: h.magic_num: '%s'\n", func, line,
311 str);
312 pr_debug("%s:%d: h.hdr_version: %u\n", func, line,
313 h->hdr_version);
314 pr_debug("%s:%d: h.db_area_offset: %u\n", func, line,
315 h->db_area_offset);
316 pr_debug("%s:%d: h.ldr_area_offset: %u\n", func, line,
317 h->ldr_area_offset);
318 pr_debug("%s:%d: h.ldr_format: %u\n", func, line,
319 h->ldr_format);
320 pr_debug("%s:%d: h.ldr_size: %xh\n", func, line,
321 h->ldr_size);
322 }
323
324 #define dump_params(_a) _dump_params(_a, __func__, __LINE__)
325 static void _dump_params(const struct os_area_params *p, const char *func,
326 int line)
327 {
328 pr_debug("%s:%d: p.boot_flag: %u\n", func, line, p->boot_flag);
329 pr_debug("%s:%d: p.num_params: %u\n", func, line, p->num_params);
330 pr_debug("%s:%d: p.rtc_diff %lld\n", func, line, p->rtc_diff);
331 pr_debug("%s:%d: p.av_multi_out %u\n", func, line, p->av_multi_out);
332 pr_debug("%s:%d: p.ctrl_button: %u\n", func, line, p->ctrl_button);
333 pr_debug("%s:%d: p.static_ip_addr: %u.%u.%u.%u\n", func, line,
334 p->static_ip_addr[0], p->static_ip_addr[1],
335 p->static_ip_addr[2], p->static_ip_addr[3]);
336 pr_debug("%s:%d: p.network_mask: %u.%u.%u.%u\n", func, line,
337 p->network_mask[0], p->network_mask[1],
338 p->network_mask[2], p->network_mask[3]);
339 pr_debug("%s:%d: p.default_gateway: %u.%u.%u.%u\n", func, line,
340 p->default_gateway[0], p->default_gateway[1],
341 p->default_gateway[2], p->default_gateway[3]);
342 pr_debug("%s:%d: p.dns_primary: %u.%u.%u.%u\n", func, line,
343 p->dns_primary[0], p->dns_primary[1],
344 p->dns_primary[2], p->dns_primary[3]);
345 pr_debug("%s:%d: p.dns_secondary: %u.%u.%u.%u\n", func, line,
346 p->dns_secondary[0], p->dns_secondary[1],
347 p->dns_secondary[2], p->dns_secondary[3]);
348 }
349
350 static int verify_header(const struct os_area_header *header)
351 {
352 if (memcmp(header->magic_num, OS_AREA_HEADER_MAGIC_NUM,
353 sizeof(header->magic_num))) {
354 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__);
355 return -1;
356 }
357
358 if (header->hdr_version < 1) {
359 pr_debug("%s:%d hdr_version failed\n", __func__, __LINE__);
360 return -1;
361 }
362
363 if (header->db_area_offset > header->ldr_area_offset) {
364 pr_debug("%s:%d offsets failed\n", __func__, __LINE__);
365 return -1;
366 }
367
368 return 0;
369 }
370
371 static int db_verify(const struct os_area_db *db)
372 {
373 if (memcmp(db->magic_num, OS_AREA_DB_MAGIC_NUM,
374 sizeof(db->magic_num))) {
375 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__);
376 return -EINVAL;
377 }
378
379 if (db->version != 1) {
380 pr_debug("%s:%d version failed\n", __func__, __LINE__);
381 return -EINVAL;
382 }
383
384 return 0;
385 }
386
387 struct db_index {
388 uint8_t owner:5;
389 uint8_t key:3;
390 };
391
392 struct db_iterator {
393 const struct os_area_db *db;
394 struct os_area_db_id match_id;
395 struct db_index *idx;
396 struct db_index *last_idx;
397 union {
398 uint64_t *value_64;
399 uint32_t *value_32;
400 uint16_t *value_16;
401 };
402 };
403
404 static unsigned int db_align_up(unsigned int val, unsigned int size)
405 {
406 return (val + (size - 1)) & (~(size - 1));
407 }
408
409 /**
410 * db_for_each_64 - Iterator for 64 bit entries.
411 *
412 * A NULL value for id can be used to match all entries.
413 * OS_AREA_DB_OWNER_ANY and OS_AREA_DB_KEY_ANY can be used to match all.
414 */
415
416 static int db_for_each_64(const struct os_area_db *db,
417 const struct os_area_db_id *match_id, struct db_iterator *i)
418 {
419 next:
420 if (!i->db) {
421 i->db = db;
422 i->match_id = match_id ? *match_id : os_area_db_id_any;
423 i->idx = (void *)db + db->index_64;
424 i->last_idx = i->idx + db->count_64;
425 i->value_64 = (void *)db + db->index_64
426 + db_align_up(db->count_64, 8);
427 } else {
428 i->idx++;
429 i->value_64++;
430 }
431
432 if (i->idx >= i->last_idx) {
433 pr_debug("%s:%d: reached end\n", __func__, __LINE__);
434 return 0;
435 }
436
437 if (i->match_id.owner != OS_AREA_DB_OWNER_ANY
438 && i->match_id.owner != (int)i->idx->owner)
439 goto next;
440 if (i->match_id.key != OS_AREA_DB_KEY_ANY
441 && i->match_id.key != (int)i->idx->key)
442 goto next;
443
444 return 1;
445 }
446
447 static int db_delete_64(struct os_area_db *db, const struct os_area_db_id *id)
448 {
449 struct db_iterator i;
450
451 for (i.db = NULL; db_for_each_64(db, id, &i); ) {
452
453 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__,
454 i.idx->owner, i.idx->key,
455 (unsigned long long)*i.value_64);
456
457 i.idx->owner = 0;
458 i.idx->key = 0;
459 *i.value_64 = 0;
460 }
461 return 0;
462 }
463
464 static int db_set_64(struct os_area_db *db, const struct os_area_db_id *id,
465 uint64_t value)
466 {
467 struct db_iterator i;
468
469 pr_debug("%s:%d: (%d:%d) <= %llxh\n", __func__, __LINE__,
470 id->owner, id->key, (unsigned long long)value);
471
472 if (!id->owner || id->owner == OS_AREA_DB_OWNER_ANY
473 || id->key == OS_AREA_DB_KEY_ANY) {
474 pr_debug("%s:%d: bad id: (%d:%d)\n", __func__,
475 __LINE__, id->owner, id->key);
476 return -1;
477 }
478
479 db_delete_64(db, id);
480
481 i.db = NULL;
482 if (db_for_each_64(db, &os_area_db_id_empty, &i)) {
483
484 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__,
485 i.idx->owner, i.idx->key,
486 (unsigned long long)*i.value_64);
487
488 i.idx->owner = id->owner;
489 i.idx->key = id->key;
490 *i.value_64 = value;
491
492 pr_debug("%s:%d: set (%d:%d) <= %llxh\n", __func__, __LINE__,
493 i.idx->owner, i.idx->key,
494 (unsigned long long)*i.value_64);
495 return 0;
496 }
497 pr_debug("%s:%d: database full.\n",
498 __func__, __LINE__);
499 return -1;
500 }
501
502 static int __init db_get_64(const struct os_area_db *db,
503 const struct os_area_db_id *id, uint64_t *value)
504 {
505 struct db_iterator i;
506
507 i.db = NULL;
508 if (db_for_each_64(db, id, &i)) {
509 *value = *i.value_64;
510 pr_debug("%s:%d: found %lld\n", __func__, __LINE__,
511 (long long int)*i.value_64);
512 return 0;
513 }
514 pr_debug("%s:%d: not found\n", __func__, __LINE__);
515 return -1;
516 }
517
518 static int __init db_get_rtc_diff(const struct os_area_db *db, int64_t *rtc_diff)
519 {
520 return db_get_64(db, &os_area_db_id_rtc_diff, (uint64_t*)rtc_diff);
521 }
522
523 #define dump_db(a) _dump_db(a, __func__, __LINE__)
524 static void _dump_db(const struct os_area_db *db, const char *func,
525 int line)
526 {
527 char str[sizeof(db->magic_num) + 1];
528
529 dump_field(str, db->magic_num, sizeof(db->magic_num));
530 pr_debug("%s:%d: db.magic_num: '%s'\n", func, line,
531 str);
532 pr_debug("%s:%d: db.version: %u\n", func, line,
533 db->version);
534 pr_debug("%s:%d: db.index_64: %u\n", func, line,
535 db->index_64);
536 pr_debug("%s:%d: db.count_64: %u\n", func, line,
537 db->count_64);
538 pr_debug("%s:%d: db.index_32: %u\n", func, line,
539 db->index_32);
540 pr_debug("%s:%d: db.count_32: %u\n", func, line,
541 db->count_32);
542 pr_debug("%s:%d: db.index_16: %u\n", func, line,
543 db->index_16);
544 pr_debug("%s:%d: db.count_16: %u\n", func, line,
545 db->count_16);
546 }
547
548 static void os_area_db_init(struct os_area_db *db)
549 {
550 enum {
551 HEADER_SIZE = offsetof(struct os_area_db, _db_data),
552 INDEX_64_COUNT = 64,
553 VALUES_64_COUNT = 57,
554 INDEX_32_COUNT = 64,
555 VALUES_32_COUNT = 57,
556 INDEX_16_COUNT = 64,
557 VALUES_16_COUNT = 57,
558 };
559
560 memset(db, 0, sizeof(struct os_area_db));
561
562 memcpy(db->magic_num, OS_AREA_DB_MAGIC_NUM, sizeof(db->magic_num));
563 db->version = 1;
564 db->index_64 = HEADER_SIZE;
565 db->count_64 = VALUES_64_COUNT;
566 db->index_32 = HEADER_SIZE
567 + INDEX_64_COUNT * sizeof(struct db_index)
568 + VALUES_64_COUNT * sizeof(u64);
569 db->count_32 = VALUES_32_COUNT;
570 db->index_16 = HEADER_SIZE
571 + INDEX_64_COUNT * sizeof(struct db_index)
572 + VALUES_64_COUNT * sizeof(u64)
573 + INDEX_32_COUNT * sizeof(struct db_index)
574 + VALUES_32_COUNT * sizeof(u32);
575 db->count_16 = VALUES_16_COUNT;
576
577 /* Rules to check db layout. */
578
579 BUILD_BUG_ON(sizeof(struct db_index) != 1);
580 BUILD_BUG_ON(sizeof(struct os_area_db) != 2 * OS_AREA_SEGMENT_SIZE);
581 BUILD_BUG_ON(INDEX_64_COUNT & 0x7);
582 BUILD_BUG_ON(VALUES_64_COUNT > INDEX_64_COUNT);
583 BUILD_BUG_ON(INDEX_32_COUNT & 0x7);
584 BUILD_BUG_ON(VALUES_32_COUNT > INDEX_32_COUNT);
585 BUILD_BUG_ON(INDEX_16_COUNT & 0x7);
586 BUILD_BUG_ON(VALUES_16_COUNT > INDEX_16_COUNT);
587 BUILD_BUG_ON(HEADER_SIZE
588 + INDEX_64_COUNT * sizeof(struct db_index)
589 + VALUES_64_COUNT * sizeof(u64)
590 + INDEX_32_COUNT * sizeof(struct db_index)
591 + VALUES_32_COUNT * sizeof(u32)
592 + INDEX_16_COUNT * sizeof(struct db_index)
593 + VALUES_16_COUNT * sizeof(u16)
594 > sizeof(struct os_area_db));
595 }
596
597 /**
598 * update_flash_db - Helper for os_area_queue_work_handler.
599 *
600 */
601
602 static int update_flash_db(void)
603 {
604 const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE;
605 struct os_area_header *header;
606 ssize_t count;
607 int error;
608 loff_t pos;
609 struct os_area_db* db;
610
611 /* Read in header and db from flash. */
612
613 header = kmalloc(buf_len, GFP_KERNEL);
614 if (!header)
615 return -ENOMEM;
616
617 count = os_area_flash_read(header, buf_len, 0);
618 if (count < 0) {
619 pr_debug("%s: os_area_flash_read failed %zd\n", __func__,
620 count);
621 error = count;
622 goto fail;
623 }
624
625 pos = header->db_area_offset * OS_AREA_SEGMENT_SIZE;
626 if (count < OS_AREA_SEGMENT_SIZE || verify_header(header) ||
627 count < pos) {
628 pr_debug("%s: verify_header failed\n", __func__);
629 dump_header(header);
630 error = -EINVAL;
631 goto fail;
632 }
633
634 /* Now got a good db offset and some maybe good db data. */
635
636 db = (void *)header + pos;
637
638 error = db_verify(db);
639 if (error) {
640 pr_notice("%s: Verify of flash database failed, formatting.\n",
641 __func__);
642 dump_db(db);
643 os_area_db_init(db);
644 }
645
646 /* Now got good db data. */
647
648 db_set_64(db, &os_area_db_id_rtc_diff, saved_params.rtc_diff);
649
650 count = os_area_flash_write(db, sizeof(struct os_area_db), pos);
651 if (count < 0 || count < sizeof(struct os_area_db)) {
652 pr_debug("%s: os_area_flash_write failed %zd\n", __func__,
653 count);
654 error = count < 0 ? count : -EIO;
655 }
656
657 fail:
658 kfree(header);
659 return error;
660 }
661
662 /**
663 * os_area_queue_work_handler - Asynchronous write handler.
664 *
665 * An asynchronous write for flash memory and the device tree. Do not
666 * call directly, use os_area_queue_work().
667 */
668
669 static void os_area_queue_work_handler(struct work_struct *work)
670 {
671 struct device_node *node;
672 int error;
673
674 pr_debug(" -> %s:%d\n", __func__, __LINE__);
675
676 node = of_find_node_by_path("/");
677 if (node) {
678 os_area_set_property(node, &property_rtc_diff);
679 of_node_put(node);
680 } else
681 pr_debug("%s:%d of_find_node_by_path failed\n",
682 __func__, __LINE__);
683
684 error = update_flash_db();
685 if (error)
686 pr_warn("%s: Could not update FLASH ROM\n", __func__);
687
688 pr_debug(" <- %s:%d\n", __func__, __LINE__);
689 }
690
691 static void os_area_queue_work(void)
692 {
693 static DECLARE_WORK(q, os_area_queue_work_handler);
694
695 wmb();
696 schedule_work(&q);
697 }
698
699 /**
700 * ps3_os_area_save_params - Copy data from os area mirror to @saved_params.
701 *
702 * For the convenience of the guest the HV makes a copy of the os area in
703 * flash to a high address in the boot memory region and then puts that RAM
704 * address and the byte count into the repository for retrieval by the guest.
705 * We copy the data we want into a static variable and allow the memory setup
706 * by the HV to be claimed by the memblock manager.
707 *
708 * The os area mirror will not be available to a second stage kernel, and
709 * the header verify will fail. In this case, the saved_params values will
710 * be set from flash memory or the passed in device tree in ps3_os_area_init().
711 */
712
713 void __init ps3_os_area_save_params(void)
714 {
715 int result;
716 u64 lpar_addr;
717 unsigned int size;
718 struct os_area_header *header;
719 struct os_area_params *params;
720 struct os_area_db *db;
721
722 pr_debug(" -> %s:%d\n", __func__, __LINE__);
723
724 result = ps3_repository_read_boot_dat_info(&lpar_addr, &size);
725
726 if (result) {
727 pr_debug("%s:%d ps3_repository_read_boot_dat_info failed\n",
728 __func__, __LINE__);
729 return;
730 }
731
732 header = (struct os_area_header *)__va(lpar_addr);
733 params = (struct os_area_params *)__va(lpar_addr
734 + OS_AREA_SEGMENT_SIZE);
735
736 result = verify_header(header);
737
738 if (result) {
739 /* Second stage kernels exit here. */
740 pr_debug("%s:%d verify_header failed\n", __func__, __LINE__);
741 dump_header(header);
742 return;
743 }
744
745 db = (struct os_area_db *)__va(lpar_addr
746 + header->db_area_offset * OS_AREA_SEGMENT_SIZE);
747
748 dump_header(header);
749 dump_params(params);
750 dump_db(db);
751
752 result = db_verify(db) || db_get_rtc_diff(db, &saved_params.rtc_diff);
753 if (result)
754 saved_params.rtc_diff = params->rtc_diff ? params->rtc_diff
755 : SECONDS_FROM_1970_TO_2000;
756 saved_params.av_multi_out = params->av_multi_out;
757 saved_params.valid = 1;
758
759 memset(header, 0, sizeof(*header));
760
761 pr_debug(" <- %s:%d\n", __func__, __LINE__);
762 }
763
764 /**
765 * ps3_os_area_init - Setup os area device tree properties as needed.
766 */
767
768 void __init ps3_os_area_init(void)
769 {
770 struct device_node *node;
771
772 pr_debug(" -> %s:%d\n", __func__, __LINE__);
773
774 node = of_find_node_by_path("/");
775
776 if (!saved_params.valid && node) {
777 /* Second stage kernels should have a dt entry. */
778 os_area_get_property(node, &property_rtc_diff);
779 os_area_get_property(node, &property_av_multi_out);
780 }
781
782 if(!saved_params.rtc_diff)
783 saved_params.rtc_diff = SECONDS_FROM_1970_TO_2000;
784
785 if (node) {
786 os_area_set_property(node, &property_rtc_diff);
787 os_area_set_property(node, &property_av_multi_out);
788 of_node_put(node);
789 } else
790 pr_debug("%s:%d of_find_node_by_path failed\n",
791 __func__, __LINE__);
792
793 pr_debug(" <- %s:%d\n", __func__, __LINE__);
794 }
795
796 /**
797 * ps3_os_area_get_rtc_diff - Returns the rtc diff value.
798 */
799
800 u64 ps3_os_area_get_rtc_diff(void)
801 {
802 return saved_params.rtc_diff;
803 }
804 EXPORT_SYMBOL_GPL(ps3_os_area_get_rtc_diff);
805
806 /**
807 * ps3_os_area_set_rtc_diff - Set the rtc diff value.
808 *
809 * An asynchronous write is needed to support writing updates from
810 * the timer interrupt context.
811 */
812
813 void ps3_os_area_set_rtc_diff(u64 rtc_diff)
814 {
815 if (saved_params.rtc_diff != rtc_diff) {
816 saved_params.rtc_diff = rtc_diff;
817 os_area_queue_work();
818 }
819 }
820 EXPORT_SYMBOL_GPL(ps3_os_area_set_rtc_diff);
821
822 /**
823 * ps3_os_area_get_av_multi_out - Returns the default video mode.
824 */
825
826 enum ps3_param_av_multi_out ps3_os_area_get_av_multi_out(void)
827 {
828 return saved_params.av_multi_out;
829 }
830 EXPORT_SYMBOL_GPL(ps3_os_area_get_av_multi_out);
831
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