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