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