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 36enum { 37 OS_AREA_SEGMENT_SIZE = 0X200, 38}; 39 40enum 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 62struct 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 73enum os_area_boot_flag { 74 PARAM_BOOT_FLAG_GAME_OS = 0, 75 PARAM_BOOT_FLAG_OTHER_OS = 1, 76}; 77 78enum 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 103struct 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 142struct 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 160enum 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 169enum 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 177struct os_area_db_id { 178 int owner; 179 int key; 180}; 181 182static 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 187static 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 192static 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 197static const struct os_area_db_id os_area_db_id_video_mode = { 198 .owner = OS_AREA_DB_OWNER_LINUX, 199 .key = OS_AREA_DB_KEY_VIDEO_MODE 200}; 201 202#define SECONDS_FROM_1970_TO_2000 946684800LL 203 204/** 205 * struct saved_params - Static working copies of data from the PS3 'os area'. 206 * 207 * The order of preference we use for the rtc_diff source: 208 * 1) The database value. 209 * 2) The game os value. 210 * 3) The number of seconds from 1970 to 2000. 211 */ 212 213struct saved_params { 214 unsigned int valid; 215 s64 rtc_diff; 216 unsigned int av_multi_out; 217} static saved_params; 218 219static struct property property_rtc_diff = { 220 .name = "linux,rtc_diff", 221 .length = sizeof(saved_params.rtc_diff), 222 .value = &saved_params.rtc_diff, 223}; 224 225static struct property property_av_multi_out = { 226 .name = "linux,av_multi_out", 227 .length = sizeof(saved_params.av_multi_out), 228 .value = &saved_params.av_multi_out, 229}; 230 231 232static DEFINE_MUTEX(os_area_flash_mutex); 233 234static const struct ps3_os_area_flash_ops *os_area_flash_ops; 235 236void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops) 237{ 238 mutex_lock(&os_area_flash_mutex); 239 os_area_flash_ops = ops; 240 mutex_unlock(&os_area_flash_mutex); 241} 242EXPORT_SYMBOL_GPL(ps3_os_area_flash_register); 243 244static ssize_t os_area_flash_read(void *buf, size_t count, loff_t pos) 245{ 246 ssize_t res = -ENODEV; 247 248 mutex_lock(&os_area_flash_mutex); 249 if (os_area_flash_ops) 250 res = os_area_flash_ops->read(buf, count, pos); 251 mutex_unlock(&os_area_flash_mutex); 252 253 return res; 254} 255 256static ssize_t os_area_flash_write(const void *buf, size_t count, loff_t pos) 257{ 258 ssize_t res = -ENODEV; 259 260 mutex_lock(&os_area_flash_mutex); 261 if (os_area_flash_ops) 262 res = os_area_flash_ops->write(buf, count, pos); 263 mutex_unlock(&os_area_flash_mutex); 264 265 return res; 266} 267 268 269/** 270 * os_area_set_property - Add or overwrite a saved_params value to the device tree. 271 * 272 * Overwrites an existing property. 273 */ 274 275static void os_area_set_property(struct device_node *node, 276 struct property *prop) 277{ 278 int result; 279 struct property *tmp = of_find_property(node, prop->name, NULL); 280 281 if (tmp) { 282 pr_debug("%s:%d found %s\n", __func__, __LINE__, prop->name); 283 of_remove_property(node, tmp); 284 } 285 286 result = of_add_property(node, prop); 287 288 if (result) 289 pr_debug("%s:%d of_set_property failed\n", __func__, 290 __LINE__); 291} 292 293/** 294 * os_area_get_property - Get a saved_params value from the device tree. 295 * 296 */ 297 298static void __init os_area_get_property(struct device_node *node, 299 struct property *prop) 300{ 301 const struct property *tmp = of_find_property(node, prop->name, NULL); 302 303 if (tmp) { 304 BUG_ON(prop->length != tmp->length); 305 memcpy(prop->value, tmp->value, prop->length); 306 } else 307 pr_debug("%s:%d not found %s\n", __func__, __LINE__, 308 prop->name); 309} 310 311static void dump_field(char *s, const u8 *field, int size_of_field) 312{ 313#if defined(DEBUG) 314 int i; 315 316 for (i = 0; i < size_of_field; i++) 317 s[i] = isprint(field[i]) ? field[i] : '.'; 318 s[i] = 0; 319#endif 320} 321 322#define dump_header(_a) _dump_header(_a, __func__, __LINE__) 323static void _dump_header(const struct os_area_header *h, const char *func, 324 int line) 325{ 326 char str[sizeof(h->magic_num) + 1]; 327 328 dump_field(str, h->magic_num, sizeof(h->magic_num)); 329 pr_debug("%s:%d: h.magic_num: '%s'\n", func, line, 330 str); 331 pr_debug("%s:%d: h.hdr_version: %u\n", func, line, 332 h->hdr_version); 333 pr_debug("%s:%d: h.db_area_offset: %u\n", func, line, 334 h->db_area_offset); 335 pr_debug("%s:%d: h.ldr_area_offset: %u\n", func, line, 336 h->ldr_area_offset); 337 pr_debug("%s:%d: h.ldr_format: %u\n", func, line, 338 h->ldr_format); 339 pr_debug("%s:%d: h.ldr_size: %xh\n", func, line, 340 h->ldr_size); 341} 342 343#define dump_params(_a) _dump_params(_a, __func__, __LINE__) 344static void _dump_params(const struct os_area_params *p, const char *func, 345 int line) 346{ 347 pr_debug("%s:%d: p.boot_flag: %u\n", func, line, p->boot_flag); 348 pr_debug("%s:%d: p.num_params: %u\n", func, line, p->num_params); 349 pr_debug("%s:%d: p.rtc_diff %lld\n", func, line, p->rtc_diff); 350 pr_debug("%s:%d: p.av_multi_out %u\n", func, line, p->av_multi_out); 351 pr_debug("%s:%d: p.ctrl_button: %u\n", func, line, p->ctrl_button); 352 pr_debug("%s:%d: p.static_ip_addr: %u.%u.%u.%u\n", func, line, 353 p->static_ip_addr[0], p->static_ip_addr[1], 354 p->static_ip_addr[2], p->static_ip_addr[3]); 355 pr_debug("%s:%d: p.network_mask: %u.%u.%u.%u\n", func, line, 356 p->network_mask[0], p->network_mask[1], 357 p->network_mask[2], p->network_mask[3]); 358 pr_debug("%s:%d: p.default_gateway: %u.%u.%u.%u\n", func, line, 359 p->default_gateway[0], p->default_gateway[1], 360 p->default_gateway[2], p->default_gateway[3]); 361 pr_debug("%s:%d: p.dns_primary: %u.%u.%u.%u\n", func, line, 362 p->dns_primary[0], p->dns_primary[1], 363 p->dns_primary[2], p->dns_primary[3]); 364 pr_debug("%s:%d: p.dns_secondary: %u.%u.%u.%u\n", func, line, 365 p->dns_secondary[0], p->dns_secondary[1], 366 p->dns_secondary[2], p->dns_secondary[3]); 367} 368 369static int verify_header(const struct os_area_header *header) 370{ 371 if (memcmp(header->magic_num, OS_AREA_HEADER_MAGIC_NUM, 372 sizeof(header->magic_num))) { 373 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__); 374 return -1; 375 } 376 377 if (header->hdr_version < 1) { 378 pr_debug("%s:%d hdr_version failed\n", __func__, __LINE__); 379 return -1; 380 } 381 382 if (header->db_area_offset > header->ldr_area_offset) { 383 pr_debug("%s:%d offsets failed\n", __func__, __LINE__); 384 return -1; 385 } 386 387 return 0; 388} 389 390static int db_verify(const struct os_area_db *db) 391{ 392 if (memcmp(db->magic_num, OS_AREA_DB_MAGIC_NUM, 393 sizeof(db->magic_num))) { 394 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__); 395 return -EINVAL; 396 } 397 398 if (db->version != 1) { 399 pr_debug("%s:%d version failed\n", __func__, __LINE__); 400 return -EINVAL; 401 } 402 403 return 0; 404} 405 406struct db_index { 407 uint8_t owner:5; 408 uint8_t key:3; 409}; 410 411struct db_iterator { 412 const struct os_area_db *db; 413 struct os_area_db_id match_id; 414 struct db_index *idx; 415 struct db_index *last_idx; 416 union { 417 uint64_t *value_64; 418 uint32_t *value_32; 419 uint16_t *value_16; 420 }; 421}; 422 423static unsigned int db_align_up(unsigned int val, unsigned int size) 424{ 425 return (val + (size - 1)) & (~(size - 1)); 426} 427 428/** 429 * db_for_each_64 - Iterator for 64 bit entries. 430 * 431 * A NULL value for id can be used to match all entries. 432 * OS_AREA_DB_OWNER_ANY and OS_AREA_DB_KEY_ANY can be used to match all. 433 */ 434 435static int db_for_each_64(const struct os_area_db *db, 436 const struct os_area_db_id *match_id, struct db_iterator *i) 437{ 438next: 439 if (!i->db) { 440 i->db = db; 441 i->match_id = match_id ? *match_id : os_area_db_id_any; 442 i->idx = (void *)db + db->index_64; 443 i->last_idx = i->idx + db->count_64; 444 i->value_64 = (void *)db + db->index_64 445 + db_align_up(db->count_64, 8); 446 } else { 447 i->idx++; 448 i->value_64++; 449 } 450 451 if (i->idx >= i->last_idx) { 452 pr_debug("%s:%d: reached end\n", __func__, __LINE__); 453 return 0; 454 } 455 456 if (i->match_id.owner != OS_AREA_DB_OWNER_ANY 457 && i->match_id.owner != (int)i->idx->owner) 458 goto next; 459 if (i->match_id.key != OS_AREA_DB_KEY_ANY 460 && i->match_id.key != (int)i->idx->key) 461 goto next; 462 463 return 1; 464} 465 466static int db_delete_64(struct os_area_db *db, const struct os_area_db_id *id) 467{ 468 struct db_iterator i; 469 470 for (i.db = NULL; db_for_each_64(db, id, &i); ) { 471 472 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__, 473 i.idx->owner, i.idx->key, 474 (unsigned long long)*i.value_64); 475 476 i.idx->owner = 0; 477 i.idx->key = 0; 478 *i.value_64 = 0; 479 } 480 return 0; 481} 482 483static int db_set_64(struct os_area_db *db, const struct os_area_db_id *id, 484 uint64_t value) 485{ 486 struct db_iterator i; 487 488 pr_debug("%s:%d: (%d:%d) <= %llxh\n", __func__, __LINE__, 489 id->owner, id->key, (unsigned long long)value); 490 491 if (!id->owner || id->owner == OS_AREA_DB_OWNER_ANY 492 || id->key == OS_AREA_DB_KEY_ANY) { 493 pr_debug("%s:%d: bad id: (%d:%d)\n", __func__, 494 __LINE__, id->owner, id->key); 495 return -1; 496 } 497 498 db_delete_64(db, id); 499 500 i.db = NULL; 501 if (db_for_each_64(db, &os_area_db_id_empty, &i)) { 502 503 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__, 504 i.idx->owner, i.idx->key, 505 (unsigned long long)*i.value_64); 506 507 i.idx->owner = id->owner; 508 i.idx->key = id->key; 509 *i.value_64 = value; 510 511 pr_debug("%s:%d: set (%d:%d) <= %llxh\n", __func__, __LINE__, 512 i.idx->owner, i.idx->key, 513 (unsigned long long)*i.value_64); 514 return 0; 515 } 516 pr_debug("%s:%d: database full.\n", 517 __func__, __LINE__); 518 return -1; 519} 520 521static int db_get_64(const struct os_area_db *db, 522 const struct os_area_db_id *id, uint64_t *value) 523{ 524 struct db_iterator i; 525 526 i.db = NULL; 527 if (db_for_each_64(db, id, &i)) { 528 *value = *i.value_64; 529 pr_debug("%s:%d: found %lld\n", __func__, __LINE__, 530 (long long int)*i.value_64); 531 return 0; 532 } 533 pr_debug("%s:%d: not found\n", __func__, __LINE__); 534 return -1; 535} 536 537static int db_get_rtc_diff(const struct os_area_db *db, int64_t *rtc_diff) 538{ 539 return db_get_64(db, &os_area_db_id_rtc_diff, (uint64_t*)rtc_diff); 540} 541 542#define dump_db(a) _dump_db(a, __func__, __LINE__) 543static void _dump_db(const struct os_area_db *db, const char *func, 544 int line) 545{ 546 char str[sizeof(db->magic_num) + 1]; 547 548 dump_field(str, db->magic_num, sizeof(db->magic_num)); 549 pr_debug("%s:%d: db.magic_num: '%s'\n", func, line, 550 str); 551 pr_debug("%s:%d: db.version: %u\n", func, line, 552 db->version); 553 pr_debug("%s:%d: db.index_64: %u\n", func, line, 554 db->index_64); 555 pr_debug("%s:%d: db.count_64: %u\n", func, line, 556 db->count_64); 557 pr_debug("%s:%d: db.index_32: %u\n", func, line, 558 db->index_32); 559 pr_debug("%s:%d: db.count_32: %u\n", func, line, 560 db->count_32); 561 pr_debug("%s:%d: db.index_16: %u\n", func, line, 562 db->index_16); 563 pr_debug("%s:%d: db.count_16: %u\n", func, line, 564 db->count_16); 565} 566 567static void os_area_db_init(struct os_area_db *db) 568{ 569 enum { 570 HEADER_SIZE = offsetof(struct os_area_db, _db_data), 571 INDEX_64_COUNT = 64, 572 VALUES_64_COUNT = 57, 573 INDEX_32_COUNT = 64, 574 VALUES_32_COUNT = 57, 575 INDEX_16_COUNT = 64, 576 VALUES_16_COUNT = 57, 577 }; 578 579 memset(db, 0, sizeof(struct os_area_db)); 580 581 memcpy(db->magic_num, OS_AREA_DB_MAGIC_NUM, sizeof(db->magic_num)); 582 db->version = 1; 583 db->index_64 = HEADER_SIZE; 584 db->count_64 = VALUES_64_COUNT; 585 db->index_32 = HEADER_SIZE 586 + INDEX_64_COUNT * sizeof(struct db_index) 587 + VALUES_64_COUNT * sizeof(u64); 588 db->count_32 = VALUES_32_COUNT; 589 db->index_16 = HEADER_SIZE 590 + INDEX_64_COUNT * sizeof(struct db_index) 591 + VALUES_64_COUNT * sizeof(u64) 592 + INDEX_32_COUNT * sizeof(struct db_index) 593 + VALUES_32_COUNT * sizeof(u32); 594 db->count_16 = VALUES_16_COUNT; 595 596 /* Rules to check db layout. */ 597 598 BUILD_BUG_ON(sizeof(struct db_index) != 1); 599 BUILD_BUG_ON(sizeof(struct os_area_db) != 2 * OS_AREA_SEGMENT_SIZE); 600 BUILD_BUG_ON(INDEX_64_COUNT & 0x7); 601 BUILD_BUG_ON(VALUES_64_COUNT > INDEX_64_COUNT); 602 BUILD_BUG_ON(INDEX_32_COUNT & 0x7); 603 BUILD_BUG_ON(VALUES_32_COUNT > INDEX_32_COUNT); 604 BUILD_BUG_ON(INDEX_16_COUNT & 0x7); 605 BUILD_BUG_ON(VALUES_16_COUNT > INDEX_16_COUNT); 606 BUILD_BUG_ON(HEADER_SIZE 607 + INDEX_64_COUNT * sizeof(struct db_index) 608 + VALUES_64_COUNT * sizeof(u64) 609 + INDEX_32_COUNT * sizeof(struct db_index) 610 + VALUES_32_COUNT * sizeof(u32) 611 + INDEX_16_COUNT * sizeof(struct db_index) 612 + VALUES_16_COUNT * sizeof(u16) 613 > sizeof(struct os_area_db)); 614} 615 616/** 617 * update_flash_db - Helper for os_area_queue_work_handler. 618 * 619 */ 620 621static int update_flash_db(void) 622{ 623 const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE; 624 struct os_area_header *header; 625 ssize_t count; 626 int error; 627 loff_t pos; 628 struct os_area_db* db; 629 630 /* Read in header and db from flash. */ 631 632 header = kmalloc(buf_len, GFP_KERNEL); 633 if (!header) { 634 pr_debug("%s: kmalloc failed\n", __func__); 635 return -ENOMEM; 636 } 637 638 count = os_area_flash_read(header, buf_len, 0); 639 if (count < 0) { 640 pr_debug("%s: os_area_flash_read failed %zd\n", __func__, 641 count); 642 error = count; 643 goto fail; 644 } 645 646 pos = header->db_area_offset * OS_AREA_SEGMENT_SIZE; 647 if (count < OS_AREA_SEGMENT_SIZE || verify_header(header) || 648 count < pos) { 649 pr_debug("%s: verify_header failed\n", __func__); 650 dump_header(header); 651 error = -EINVAL; 652 goto fail; 653 } 654 655 /* Now got a good db offset and some maybe good db data. */ 656 657 db = (void *)header + pos; 658 659 error = db_verify(db); 660 if (error) { 661 pr_notice("%s: Verify of flash database failed, formatting.\n", 662 __func__); 663 dump_db(db); 664 os_area_db_init(db); 665 } 666 667 /* Now got good db data. */ 668 669 db_set_64(db, &os_area_db_id_rtc_diff, saved_params.rtc_diff); 670 671 count = os_area_flash_write(db, sizeof(struct os_area_db), pos); 672 if (count < sizeof(struct os_area_db)) { 673 pr_debug("%s: os_area_flash_write failed %zd\n", __func__, 674 count); 675 error = count < 0 ? count : -EIO; 676 } 677 678fail: 679 kfree(header); 680 return error; 681} 682 683/** 684 * os_area_queue_work_handler - Asynchronous write handler. 685 * 686 * An asynchronous write for flash memory and the device tree. Do not 687 * call directly, use os_area_queue_work(). 688 */ 689 690static void os_area_queue_work_handler(struct work_struct *work) 691{ 692 struct device_node *node; 693 int error; 694 695 pr_debug(" -> %s:%d\n", __func__, __LINE__); 696 697 node = of_find_node_by_path("/"); 698 if (node) { 699 os_area_set_property(node, &property_rtc_diff); 700 of_node_put(node); 701 } else 702 pr_debug("%s:%d of_find_node_by_path failed\n", 703 __func__, __LINE__); 704 705 error = update_flash_db(); 706 if (error) 707 pr_warning("%s: Could not update FLASH ROM\n", __func__); 708 709 pr_debug(" <- %s:%d\n", __func__, __LINE__); 710} 711 712static void os_area_queue_work(void) 713{ 714 static DECLARE_WORK(q, os_area_queue_work_handler); 715 716 wmb(); 717 schedule_work(&q); 718} 719 720/** 721 * ps3_os_area_save_params - Copy data from os area mirror to @saved_params. 722 * 723 * For the convenience of the guest the HV makes a copy of the os area in 724 * flash to a high address in the boot memory region and then puts that RAM 725 * address and the byte count into the repository for retrieval by the guest. 726 * We copy the data we want into a static variable and allow the memory setup 727 * by the HV to be claimed by the memblock manager. 728 * 729 * The os area mirror will not be available to a second stage kernel, and 730 * the header verify will fail. In this case, the saved_params values will 731 * be set from flash memory or the passed in device tree in ps3_os_area_init(). 732 */ 733 734void __init ps3_os_area_save_params(void) 735{ 736 int result; 737 u64 lpar_addr; 738 unsigned int size; 739 struct os_area_header *header; 740 struct os_area_params *params; 741 struct os_area_db *db; 742 743 pr_debug(" -> %s:%d\n", __func__, __LINE__); 744 745 result = ps3_repository_read_boot_dat_info(&lpar_addr, &size); 746 747 if (result) { 748 pr_debug("%s:%d ps3_repository_read_boot_dat_info failed\n", 749 __func__, __LINE__); 750 return; 751 } 752 753 header = (struct os_area_header *)__va(lpar_addr); 754 params = (struct os_area_params *)__va(lpar_addr 755 + OS_AREA_SEGMENT_SIZE); 756 757 result = verify_header(header); 758 759 if (result) { 760 /* Second stage kernels exit here. */ 761 pr_debug("%s:%d verify_header failed\n", __func__, __LINE__); 762 dump_header(header); 763 return; 764 } 765 766 db = (struct os_area_db *)__va(lpar_addr 767 + header->db_area_offset * OS_AREA_SEGMENT_SIZE); 768 769 dump_header(header); 770 dump_params(params); 771 dump_db(db); 772 773 result = db_verify(db) || db_get_rtc_diff(db, &saved_params.rtc_diff); 774 if (result) 775 saved_params.rtc_diff = params->rtc_diff ? params->rtc_diff 776 : SECONDS_FROM_1970_TO_2000; 777 saved_params.av_multi_out = params->av_multi_out; 778 saved_params.valid = 1; 779 780 memset(header, 0, sizeof(*header)); 781 782 pr_debug(" <- %s:%d\n", __func__, __LINE__); 783} 784 785/** 786 * ps3_os_area_init - Setup os area device tree properties as needed. 787 */ 788 789void __init ps3_os_area_init(void) 790{ 791 struct device_node *node; 792 793 pr_debug(" -> %s:%d\n", __func__, __LINE__); 794 795 node = of_find_node_by_path("/"); 796 797 if (!saved_params.valid && node) { 798 /* Second stage kernels should have a dt entry. */ 799 os_area_get_property(node, &property_rtc_diff); 800 os_area_get_property(node, &property_av_multi_out); 801 } 802 803 if(!saved_params.rtc_diff) 804 saved_params.rtc_diff = SECONDS_FROM_1970_TO_2000; 805 806 if (node) { 807 os_area_set_property(node, &property_rtc_diff); 808 os_area_set_property(node, &property_av_multi_out); 809 of_node_put(node); 810 } else 811 pr_debug("%s:%d of_find_node_by_path failed\n", 812 __func__, __LINE__); 813 814 pr_debug(" <- %s:%d\n", __func__, __LINE__); 815} 816 817/** 818 * ps3_os_area_get_rtc_diff - Returns the rtc diff value. 819 */ 820 821u64 ps3_os_area_get_rtc_diff(void) 822{ 823 return saved_params.rtc_diff; 824} 825EXPORT_SYMBOL_GPL(ps3_os_area_get_rtc_diff); 826 827/** 828 * ps3_os_area_set_rtc_diff - Set the rtc diff value. 829 * 830 * An asynchronous write is needed to support writing updates from 831 * the timer interrupt context. 832 */ 833 834void ps3_os_area_set_rtc_diff(u64 rtc_diff) 835{ 836 if (saved_params.rtc_diff != rtc_diff) { 837 saved_params.rtc_diff = rtc_diff; 838 os_area_queue_work(); 839 } 840} 841EXPORT_SYMBOL_GPL(ps3_os_area_set_rtc_diff); 842 843/** 844 * ps3_os_area_get_av_multi_out - Returns the default video mode. 845 */ 846 847enum ps3_param_av_multi_out ps3_os_area_get_av_multi_out(void) 848{ 849 return saved_params.av_multi_out; 850} 851EXPORT_SYMBOL_GPL(ps3_os_area_get_av_multi_out); 852