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 #define SECONDS_FROM_1970_TO_2000 946684800LL 198 199 /** 200 * struct saved_params - Static working copies of data from the PS3 'os area'. 201 * 202 * The order of preference we use for the rtc_diff source: 203 * 1) The database value. 204 * 2) The game os value. 205 * 3) The number of seconds from 1970 to 2000. 206 */ 207 208 static struct saved_params { 209 unsigned int valid; 210 s64 rtc_diff; 211 unsigned int av_multi_out; 212 } saved_params; 213 214 static struct property property_rtc_diff = { 215 .name = "linux,rtc_diff", 216 .length = sizeof(saved_params.rtc_diff), 217 .value = &saved_params.rtc_diff, 218 }; 219 220 static struct property property_av_multi_out = { 221 .name = "linux,av_multi_out", 222 .length = sizeof(saved_params.av_multi_out), 223 .value = &saved_params.av_multi_out, 224 }; 225 226 227 static DEFINE_MUTEX(os_area_flash_mutex); 228 229 static const struct ps3_os_area_flash_ops *os_area_flash_ops; 230 231 void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops) 232 { 233 mutex_lock(&os_area_flash_mutex); 234 os_area_flash_ops = ops; 235 mutex_unlock(&os_area_flash_mutex); 236 } 237 EXPORT_SYMBOL_GPL(ps3_os_area_flash_register); 238 239 static ssize_t os_area_flash_read(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->read(buf, count, pos); 246 mutex_unlock(&os_area_flash_mutex); 247 248 return res; 249 } 250 251 static ssize_t os_area_flash_write(const void *buf, size_t count, loff_t pos) 252 { 253 ssize_t res = -ENODEV; 254 255 mutex_lock(&os_area_flash_mutex); 256 if (os_area_flash_ops) 257 res = os_area_flash_ops->write(buf, count, pos); 258 mutex_unlock(&os_area_flash_mutex); 259 260 return res; 261 } 262 263 264 /** 265 * os_area_set_property - Add or overwrite a saved_params value to the device tree. 266 * 267 * Overwrites an existing property. 268 */ 269 270 static void os_area_set_property(struct device_node *node, 271 struct property *prop) 272 { 273 int result; 274 struct property *tmp = of_find_property(node, prop->name, NULL); 275 276 if (tmp) { 277 pr_debug("%s:%d found %s\n", __func__, __LINE__, prop->name); 278 of_remove_property(node, tmp); 279 } 280 281 result = of_add_property(node, prop); 282 283 if (result) 284 pr_debug("%s:%d of_set_property failed\n", __func__, 285 __LINE__); 286 } 287 288 /** 289 * os_area_get_property - Get a saved_params value from the device tree. 290 * 291 */ 292 293 static void __init os_area_get_property(struct device_node *node, 294 struct property *prop) 295 { 296 const struct property *tmp = of_find_property(node, prop->name, NULL); 297 298 if (tmp) { 299 BUG_ON(prop->length != tmp->length); 300 memcpy(prop->value, tmp->value, prop->length); 301 } else 302 pr_debug("%s:%d not found %s\n", __func__, __LINE__, 303 prop->name); 304 } 305 306 static void dump_field(char *s, const u8 *field, int size_of_field) 307 { 308 #if defined(DEBUG) 309 int i; 310 311 for (i = 0; i < size_of_field; i++) 312 s[i] = isprint(field[i]) ? field[i] : '.'; 313 s[i] = 0; 314 #endif 315 } 316 317 #define dump_header(_a) _dump_header(_a, __func__, __LINE__) 318 static void _dump_header(const struct os_area_header *h, const char *func, 319 int line) 320 { 321 char str[sizeof(h->magic_num) + 1]; 322 323 dump_field(str, h->magic_num, sizeof(h->magic_num)); 324 pr_debug("%s:%d: h.magic_num: '%s'\n", func, line, 325 str); 326 pr_debug("%s:%d: h.hdr_version: %u\n", func, line, 327 h->hdr_version); 328 pr_debug("%s:%d: h.db_area_offset: %u\n", func, line, 329 h->db_area_offset); 330 pr_debug("%s:%d: h.ldr_area_offset: %u\n", func, line, 331 h->ldr_area_offset); 332 pr_debug("%s:%d: h.ldr_format: %u\n", func, line, 333 h->ldr_format); 334 pr_debug("%s:%d: h.ldr_size: %xh\n", func, line, 335 h->ldr_size); 336 } 337 338 #define dump_params(_a) _dump_params(_a, __func__, __LINE__) 339 static void _dump_params(const struct os_area_params *p, const char *func, 340 int line) 341 { 342 pr_debug("%s:%d: p.boot_flag: %u\n", func, line, p->boot_flag); 343 pr_debug("%s:%d: p.num_params: %u\n", func, line, p->num_params); 344 pr_debug("%s:%d: p.rtc_diff %lld\n", func, line, p->rtc_diff); 345 pr_debug("%s:%d: p.av_multi_out %u\n", func, line, p->av_multi_out); 346 pr_debug("%s:%d: p.ctrl_button: %u\n", func, line, p->ctrl_button); 347 pr_debug("%s:%d: p.static_ip_addr: %u.%u.%u.%u\n", func, line, 348 p->static_ip_addr[0], p->static_ip_addr[1], 349 p->static_ip_addr[2], p->static_ip_addr[3]); 350 pr_debug("%s:%d: p.network_mask: %u.%u.%u.%u\n", func, line, 351 p->network_mask[0], p->network_mask[1], 352 p->network_mask[2], p->network_mask[3]); 353 pr_debug("%s:%d: p.default_gateway: %u.%u.%u.%u\n", func, line, 354 p->default_gateway[0], p->default_gateway[1], 355 p->default_gateway[2], p->default_gateway[3]); 356 pr_debug("%s:%d: p.dns_primary: %u.%u.%u.%u\n", func, line, 357 p->dns_primary[0], p->dns_primary[1], 358 p->dns_primary[2], p->dns_primary[3]); 359 pr_debug("%s:%d: p.dns_secondary: %u.%u.%u.%u\n", func, line, 360 p->dns_secondary[0], p->dns_secondary[1], 361 p->dns_secondary[2], p->dns_secondary[3]); 362 } 363 364 static int verify_header(const struct os_area_header *header) 365 { 366 if (memcmp(header->magic_num, OS_AREA_HEADER_MAGIC_NUM, 367 sizeof(header->magic_num))) { 368 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__); 369 return -1; 370 } 371 372 if (header->hdr_version < 1) { 373 pr_debug("%s:%d hdr_version failed\n", __func__, __LINE__); 374 return -1; 375 } 376 377 if (header->db_area_offset > header->ldr_area_offset) { 378 pr_debug("%s:%d offsets failed\n", __func__, __LINE__); 379 return -1; 380 } 381 382 return 0; 383 } 384 385 static int db_verify(const struct os_area_db *db) 386 { 387 if (memcmp(db->magic_num, OS_AREA_DB_MAGIC_NUM, 388 sizeof(db->magic_num))) { 389 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__); 390 return -EINVAL; 391 } 392 393 if (db->version != 1) { 394 pr_debug("%s:%d version failed\n", __func__, __LINE__); 395 return -EINVAL; 396 } 397 398 return 0; 399 } 400 401 struct db_index { 402 uint8_t owner:5; 403 uint8_t key:3; 404 }; 405 406 struct db_iterator { 407 const struct os_area_db *db; 408 struct os_area_db_id match_id; 409 struct db_index *idx; 410 struct db_index *last_idx; 411 union { 412 uint64_t *value_64; 413 uint32_t *value_32; 414 uint16_t *value_16; 415 }; 416 }; 417 418 static unsigned int db_align_up(unsigned int val, unsigned int size) 419 { 420 return (val + (size - 1)) & (~(size - 1)); 421 } 422 423 /** 424 * db_for_each_64 - Iterator for 64 bit entries. 425 * 426 * A NULL value for id can be used to match all entries. 427 * OS_AREA_DB_OWNER_ANY and OS_AREA_DB_KEY_ANY can be used to match all. 428 */ 429 430 static int db_for_each_64(const struct os_area_db *db, 431 const struct os_area_db_id *match_id, struct db_iterator *i) 432 { 433 next: 434 if (!i->db) { 435 i->db = db; 436 i->match_id = match_id ? *match_id : os_area_db_id_any; 437 i->idx = (void *)db + db->index_64; 438 i->last_idx = i->idx + db->count_64; 439 i->value_64 = (void *)db + db->index_64 440 + db_align_up(db->count_64, 8); 441 } else { 442 i->idx++; 443 i->value_64++; 444 } 445 446 if (i->idx >= i->last_idx) { 447 pr_debug("%s:%d: reached end\n", __func__, __LINE__); 448 return 0; 449 } 450 451 if (i->match_id.owner != OS_AREA_DB_OWNER_ANY 452 && i->match_id.owner != (int)i->idx->owner) 453 goto next; 454 if (i->match_id.key != OS_AREA_DB_KEY_ANY 455 && i->match_id.key != (int)i->idx->key) 456 goto next; 457 458 return 1; 459 } 460 461 static int db_delete_64(struct os_area_db *db, const struct os_area_db_id *id) 462 { 463 struct db_iterator i; 464 465 for (i.db = NULL; db_for_each_64(db, id, &i); ) { 466 467 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__, 468 i.idx->owner, i.idx->key, 469 (unsigned long long)*i.value_64); 470 471 i.idx->owner = 0; 472 i.idx->key = 0; 473 *i.value_64 = 0; 474 } 475 return 0; 476 } 477 478 static int db_set_64(struct os_area_db *db, const struct os_area_db_id *id, 479 uint64_t value) 480 { 481 struct db_iterator i; 482 483 pr_debug("%s:%d: (%d:%d) <= %llxh\n", __func__, __LINE__, 484 id->owner, id->key, (unsigned long long)value); 485 486 if (!id->owner || id->owner == OS_AREA_DB_OWNER_ANY 487 || id->key == OS_AREA_DB_KEY_ANY) { 488 pr_debug("%s:%d: bad id: (%d:%d)\n", __func__, 489 __LINE__, id->owner, id->key); 490 return -1; 491 } 492 493 db_delete_64(db, id); 494 495 i.db = NULL; 496 if (db_for_each_64(db, &os_area_db_id_empty, &i)) { 497 498 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__, 499 i.idx->owner, i.idx->key, 500 (unsigned long long)*i.value_64); 501 502 i.idx->owner = id->owner; 503 i.idx->key = id->key; 504 *i.value_64 = value; 505 506 pr_debug("%s:%d: set (%d:%d) <= %llxh\n", __func__, __LINE__, 507 i.idx->owner, i.idx->key, 508 (unsigned long long)*i.value_64); 509 return 0; 510 } 511 pr_debug("%s:%d: database full.\n", 512 __func__, __LINE__); 513 return -1; 514 } 515 516 static int db_get_64(const struct os_area_db *db, 517 const struct os_area_db_id *id, uint64_t *value) 518 { 519 struct db_iterator i; 520 521 i.db = NULL; 522 if (db_for_each_64(db, id, &i)) { 523 *value = *i.value_64; 524 pr_debug("%s:%d: found %lld\n", __func__, __LINE__, 525 (long long int)*i.value_64); 526 return 0; 527 } 528 pr_debug("%s:%d: not found\n", __func__, __LINE__); 529 return -1; 530 } 531 532 static int db_get_rtc_diff(const struct os_area_db *db, int64_t *rtc_diff) 533 { 534 return db_get_64(db, &os_area_db_id_rtc_diff, (uint64_t*)rtc_diff); 535 } 536 537 #define dump_db(a) _dump_db(a, __func__, __LINE__) 538 static void _dump_db(const struct os_area_db *db, const char *func, 539 int line) 540 { 541 char str[sizeof(db->magic_num) + 1]; 542 543 dump_field(str, db->magic_num, sizeof(db->magic_num)); 544 pr_debug("%s:%d: db.magic_num: '%s'\n", func, line, 545 str); 546 pr_debug("%s:%d: db.version: %u\n", func, line, 547 db->version); 548 pr_debug("%s:%d: db.index_64: %u\n", func, line, 549 db->index_64); 550 pr_debug("%s:%d: db.count_64: %u\n", func, line, 551 db->count_64); 552 pr_debug("%s:%d: db.index_32: %u\n", func, line, 553 db->index_32); 554 pr_debug("%s:%d: db.count_32: %u\n", func, line, 555 db->count_32); 556 pr_debug("%s:%d: db.index_16: %u\n", func, line, 557 db->index_16); 558 pr_debug("%s:%d: db.count_16: %u\n", func, line, 559 db->count_16); 560 } 561 562 static void os_area_db_init(struct os_area_db *db) 563 { 564 enum { 565 HEADER_SIZE = offsetof(struct os_area_db, _db_data), 566 INDEX_64_COUNT = 64, 567 VALUES_64_COUNT = 57, 568 INDEX_32_COUNT = 64, 569 VALUES_32_COUNT = 57, 570 INDEX_16_COUNT = 64, 571 VALUES_16_COUNT = 57, 572 }; 573 574 memset(db, 0, sizeof(struct os_area_db)); 575 576 memcpy(db->magic_num, OS_AREA_DB_MAGIC_NUM, sizeof(db->magic_num)); 577 db->version = 1; 578 db->index_64 = HEADER_SIZE; 579 db->count_64 = VALUES_64_COUNT; 580 db->index_32 = HEADER_SIZE 581 + INDEX_64_COUNT * sizeof(struct db_index) 582 + VALUES_64_COUNT * sizeof(u64); 583 db->count_32 = VALUES_32_COUNT; 584 db->index_16 = HEADER_SIZE 585 + INDEX_64_COUNT * sizeof(struct db_index) 586 + VALUES_64_COUNT * sizeof(u64) 587 + INDEX_32_COUNT * sizeof(struct db_index) 588 + VALUES_32_COUNT * sizeof(u32); 589 db->count_16 = VALUES_16_COUNT; 590 591 /* Rules to check db layout. */ 592 593 BUILD_BUG_ON(sizeof(struct db_index) != 1); 594 BUILD_BUG_ON(sizeof(struct os_area_db) != 2 * OS_AREA_SEGMENT_SIZE); 595 BUILD_BUG_ON(INDEX_64_COUNT & 0x7); 596 BUILD_BUG_ON(VALUES_64_COUNT > INDEX_64_COUNT); 597 BUILD_BUG_ON(INDEX_32_COUNT & 0x7); 598 BUILD_BUG_ON(VALUES_32_COUNT > INDEX_32_COUNT); 599 BUILD_BUG_ON(INDEX_16_COUNT & 0x7); 600 BUILD_BUG_ON(VALUES_16_COUNT > INDEX_16_COUNT); 601 BUILD_BUG_ON(HEADER_SIZE 602 + INDEX_64_COUNT * sizeof(struct db_index) 603 + VALUES_64_COUNT * sizeof(u64) 604 + INDEX_32_COUNT * sizeof(struct db_index) 605 + VALUES_32_COUNT * sizeof(u32) 606 + INDEX_16_COUNT * sizeof(struct db_index) 607 + VALUES_16_COUNT * sizeof(u16) 608 > sizeof(struct os_area_db)); 609 } 610 611 /** 612 * update_flash_db - Helper for os_area_queue_work_handler. 613 * 614 */ 615 616 static int update_flash_db(void) 617 { 618 const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE; 619 struct os_area_header *header; 620 ssize_t count; 621 int error; 622 loff_t pos; 623 struct os_area_db* db; 624 625 /* Read in header and db from flash. */ 626 627 header = kmalloc(buf_len, GFP_KERNEL); 628 if (!header) { 629 pr_debug("%s: kmalloc failed\n", __func__); 630 return -ENOMEM; 631 } 632 633 count = os_area_flash_read(header, buf_len, 0); 634 if (count < 0) { 635 pr_debug("%s: os_area_flash_read failed %zd\n", __func__, 636 count); 637 error = count; 638 goto fail; 639 } 640 641 pos = header->db_area_offset * OS_AREA_SEGMENT_SIZE; 642 if (count < OS_AREA_SEGMENT_SIZE || verify_header(header) || 643 count < pos) { 644 pr_debug("%s: verify_header failed\n", __func__); 645 dump_header(header); 646 error = -EINVAL; 647 goto fail; 648 } 649 650 /* Now got a good db offset and some maybe good db data. */ 651 652 db = (void *)header + pos; 653 654 error = db_verify(db); 655 if (error) { 656 pr_notice("%s: Verify of flash database failed, formatting.\n", 657 __func__); 658 dump_db(db); 659 os_area_db_init(db); 660 } 661 662 /* Now got good db data. */ 663 664 db_set_64(db, &os_area_db_id_rtc_diff, saved_params.rtc_diff); 665 666 count = os_area_flash_write(db, sizeof(struct os_area_db), pos); 667 if (count < 0 || count < sizeof(struct os_area_db)) { 668 pr_debug("%s: os_area_flash_write failed %zd\n", __func__, 669 count); 670 error = count < 0 ? count : -EIO; 671 } 672 673 fail: 674 kfree(header); 675 return error; 676 } 677 678 /** 679 * os_area_queue_work_handler - Asynchronous write handler. 680 * 681 * An asynchronous write for flash memory and the device tree. Do not 682 * call directly, use os_area_queue_work(). 683 */ 684 685 static void os_area_queue_work_handler(struct work_struct *work) 686 { 687 struct device_node *node; 688 int error; 689 690 pr_debug(" -> %s:%d\n", __func__, __LINE__); 691 692 node = of_find_node_by_path("/"); 693 if (node) { 694 os_area_set_property(node, &property_rtc_diff); 695 of_node_put(node); 696 } else 697 pr_debug("%s:%d of_find_node_by_path failed\n", 698 __func__, __LINE__); 699 700 error = update_flash_db(); 701 if (error) 702 pr_warn("%s: Could not update FLASH ROM\n", __func__); 703 704 pr_debug(" <- %s:%d\n", __func__, __LINE__); 705 } 706 707 static void os_area_queue_work(void) 708 { 709 static DECLARE_WORK(q, os_area_queue_work_handler); 710 711 wmb(); 712 schedule_work(&q); 713 } 714 715 /** 716 * ps3_os_area_save_params - Copy data from os area mirror to @saved_params. 717 * 718 * For the convenience of the guest the HV makes a copy of the os area in 719 * flash to a high address in the boot memory region and then puts that RAM 720 * address and the byte count into the repository for retrieval by the guest. 721 * We copy the data we want into a static variable and allow the memory setup 722 * by the HV to be claimed by the memblock manager. 723 * 724 * The os area mirror will not be available to a second stage kernel, and 725 * the header verify will fail. In this case, the saved_params values will 726 * be set from flash memory or the passed in device tree in ps3_os_area_init(). 727 */ 728 729 void __init ps3_os_area_save_params(void) 730 { 731 int result; 732 u64 lpar_addr; 733 unsigned int size; 734 struct os_area_header *header; 735 struct os_area_params *params; 736 struct os_area_db *db; 737 738 pr_debug(" -> %s:%d\n", __func__, __LINE__); 739 740 result = ps3_repository_read_boot_dat_info(&lpar_addr, &size); 741 742 if (result) { 743 pr_debug("%s:%d ps3_repository_read_boot_dat_info failed\n", 744 __func__, __LINE__); 745 return; 746 } 747 748 header = (struct os_area_header *)__va(lpar_addr); 749 params = (struct os_area_params *)__va(lpar_addr 750 + OS_AREA_SEGMENT_SIZE); 751 752 result = verify_header(header); 753 754 if (result) { 755 /* Second stage kernels exit here. */ 756 pr_debug("%s:%d verify_header failed\n", __func__, __LINE__); 757 dump_header(header); 758 return; 759 } 760 761 db = (struct os_area_db *)__va(lpar_addr 762 + header->db_area_offset * OS_AREA_SEGMENT_SIZE); 763 764 dump_header(header); 765 dump_params(params); 766 dump_db(db); 767 768 result = db_verify(db) || db_get_rtc_diff(db, &saved_params.rtc_diff); 769 if (result) 770 saved_params.rtc_diff = params->rtc_diff ? params->rtc_diff 771 : SECONDS_FROM_1970_TO_2000; 772 saved_params.av_multi_out = params->av_multi_out; 773 saved_params.valid = 1; 774 775 memset(header, 0, sizeof(*header)); 776 777 pr_debug(" <- %s:%d\n", __func__, __LINE__); 778 } 779 780 /** 781 * ps3_os_area_init - Setup os area device tree properties as needed. 782 */ 783 784 void __init ps3_os_area_init(void) 785 { 786 struct device_node *node; 787 788 pr_debug(" -> %s:%d\n", __func__, __LINE__); 789 790 node = of_find_node_by_path("/"); 791 792 if (!saved_params.valid && node) { 793 /* Second stage kernels should have a dt entry. */ 794 os_area_get_property(node, &property_rtc_diff); 795 os_area_get_property(node, &property_av_multi_out); 796 } 797 798 if(!saved_params.rtc_diff) 799 saved_params.rtc_diff = SECONDS_FROM_1970_TO_2000; 800 801 if (node) { 802 os_area_set_property(node, &property_rtc_diff); 803 os_area_set_property(node, &property_av_multi_out); 804 of_node_put(node); 805 } else 806 pr_debug("%s:%d of_find_node_by_path failed\n", 807 __func__, __LINE__); 808 809 pr_debug(" <- %s:%d\n", __func__, __LINE__); 810 } 811 812 /** 813 * ps3_os_area_get_rtc_diff - Returns the rtc diff value. 814 */ 815 816 u64 ps3_os_area_get_rtc_diff(void) 817 { 818 return saved_params.rtc_diff; 819 } 820 EXPORT_SYMBOL_GPL(ps3_os_area_get_rtc_diff); 821 822 /** 823 * ps3_os_area_set_rtc_diff - Set the rtc diff value. 824 * 825 * An asynchronous write is needed to support writing updates from 826 * the timer interrupt context. 827 */ 828 829 void ps3_os_area_set_rtc_diff(u64 rtc_diff) 830 { 831 if (saved_params.rtc_diff != rtc_diff) { 832 saved_params.rtc_diff = rtc_diff; 833 os_area_queue_work(); 834 } 835 } 836 EXPORT_SYMBOL_GPL(ps3_os_area_set_rtc_diff); 837 838 /** 839 * ps3_os_area_get_av_multi_out - Returns the default video mode. 840 */ 841 842 enum ps3_param_av_multi_out ps3_os_area_get_av_multi_out(void) 843 { 844 return saved_params.av_multi_out; 845 } 846 EXPORT_SYMBOL_GPL(ps3_os_area_get_av_multi_out); 847