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/memblock.h> 28#include <linux/of.h> 29#include <linux/slab.h> 30 31#include <asm/prom.h> 32 33#include "platform.h" 34 35enum { 36 OS_AREA_SEGMENT_SIZE = 0X200, 37}; 38 39enum os_area_ldr_format { 40 HEADER_LDR_FORMAT_RAW = 0, 41 HEADER_LDR_FORMAT_GZIP = 1, 42}; 43 44#define OS_AREA_HEADER_MAGIC_NUM "cell_ext_os_area" 45 46/** 47 * struct os_area_header - os area header segment. 48 * @magic_num: Always 'cell_ext_os_area'. 49 * @hdr_version: Header format version number. 50 * @db_area_offset: Starting segment number of other os database area. 51 * @ldr_area_offset: Starting segment number of bootloader image area. 52 * @ldr_format: HEADER_LDR_FORMAT flag. 53 * @ldr_size: Size of bootloader image in bytes. 54 * 55 * Note that the docs refer to area offsets. These are offsets in units of 56 * segments from the start of the os area (top of the header). These are 57 * better thought of as segment numbers. The os area of the os area is 58 * reserved for the os image. 59 */ 60 61struct os_area_header { 62 u8 magic_num[16]; 63 u32 hdr_version; 64 u32 db_area_offset; 65 u32 ldr_area_offset; 66 u32 _reserved_1; 67 u32 ldr_format; 68 u32 ldr_size; 69 u32 _reserved_2[6]; 70}; 71 72enum os_area_boot_flag { 73 PARAM_BOOT_FLAG_GAME_OS = 0, 74 PARAM_BOOT_FLAG_OTHER_OS = 1, 75}; 76 77enum os_area_ctrl_button { 78 PARAM_CTRL_BUTTON_O_IS_YES = 0, 79 PARAM_CTRL_BUTTON_X_IS_YES = 1, 80}; 81 82/** 83 * struct os_area_params - os area params segment. 84 * @boot_flag: User preference of operating system, PARAM_BOOT_FLAG flag. 85 * @num_params: Number of params in this (params) segment. 86 * @rtc_diff: Difference in seconds between 1970 and the ps3 rtc value. 87 * @av_multi_out: User preference of AV output, PARAM_AV_MULTI_OUT flag. 88 * @ctrl_button: User preference of controller button config, PARAM_CTRL_BUTTON 89 * flag. 90 * @static_ip_addr: User preference of static IP address. 91 * @network_mask: User preference of static network mask. 92 * @default_gateway: User preference of static default gateway. 93 * @dns_primary: User preference of static primary dns server. 94 * @dns_secondary: User preference of static secondary dns server. 95 * 96 * The ps3 rtc maintains a read-only value that approximates seconds since 97 * 2000-01-01 00:00:00 UTC. 98 * 99 * User preference of zero for static_ip_addr means use dhcp. 100 */ 101 102struct os_area_params { 103 u32 boot_flag; 104 u32 _reserved_1[3]; 105 u32 num_params; 106 u32 _reserved_2[3]; 107 /* param 0 */ 108 s64 rtc_diff; 109 u8 av_multi_out; 110 u8 ctrl_button; 111 u8 _reserved_3[6]; 112 /* param 1 */ 113 u8 static_ip_addr[4]; 114 u8 network_mask[4]; 115 u8 default_gateway[4]; 116 u8 _reserved_4[4]; 117 /* param 2 */ 118 u8 dns_primary[4]; 119 u8 dns_secondary[4]; 120 u8 _reserved_5[8]; 121}; 122 123#define OS_AREA_DB_MAGIC_NUM "-db-" 124 125/** 126 * struct os_area_db - Shared flash memory database. 127 * @magic_num: Always '-db-'. 128 * @version: os_area_db format version number. 129 * @index_64: byte offset of the database id index for 64 bit variables. 130 * @count_64: number of usable 64 bit index entries 131 * @index_32: byte offset of the database id index for 32 bit variables. 132 * @count_32: number of usable 32 bit index entries 133 * @index_16: byte offset of the database id index for 16 bit variables. 134 * @count_16: number of usable 16 bit index entries 135 * 136 * Flash rom storage for exclusive use by guests running in the other os lpar. 137 * The current system configuration allocates 1K (two segments) for other os 138 * use. 139 */ 140 141struct os_area_db { 142 u8 magic_num[4]; 143 u16 version; 144 u16 _reserved_1; 145 u16 index_64; 146 u16 count_64; 147 u16 index_32; 148 u16 count_32; 149 u16 index_16; 150 u16 count_16; 151 u32 _reserved_2; 152 u8 _db_data[1000]; 153}; 154 155/** 156 * enum os_area_db_owner - Data owners. 157 */ 158 159enum os_area_db_owner { 160 OS_AREA_DB_OWNER_ANY = -1, 161 OS_AREA_DB_OWNER_NONE = 0, 162 OS_AREA_DB_OWNER_PROTOTYPE = 1, 163 OS_AREA_DB_OWNER_LINUX = 2, 164 OS_AREA_DB_OWNER_PETITBOOT = 3, 165 OS_AREA_DB_OWNER_MAX = 32, 166}; 167 168enum os_area_db_key { 169 OS_AREA_DB_KEY_ANY = -1, 170 OS_AREA_DB_KEY_NONE = 0, 171 OS_AREA_DB_KEY_RTC_DIFF = 1, 172 OS_AREA_DB_KEY_VIDEO_MODE = 2, 173 OS_AREA_DB_KEY_MAX = 8, 174}; 175 176struct os_area_db_id { 177 int owner; 178 int key; 179}; 180 181static const struct os_area_db_id os_area_db_id_empty = { 182 .owner = OS_AREA_DB_OWNER_NONE, 183 .key = OS_AREA_DB_KEY_NONE 184}; 185 186static const struct os_area_db_id os_area_db_id_any = { 187 .owner = OS_AREA_DB_OWNER_ANY, 188 .key = OS_AREA_DB_KEY_ANY 189}; 190 191static const struct os_area_db_id os_area_db_id_rtc_diff = { 192 .owner = OS_AREA_DB_OWNER_LINUX, 193 .key = OS_AREA_DB_KEY_RTC_DIFF 194}; 195 196static const struct os_area_db_id os_area_db_id_video_mode = { 197 .owner = OS_AREA_DB_OWNER_LINUX, 198 .key = OS_AREA_DB_KEY_VIDEO_MODE 199}; 200 201#define SECONDS_FROM_1970_TO_2000 946684800LL 202 203/** 204 * struct saved_params - Static working copies of data from the PS3 'os area'. 205 * 206 * The order of preference we use for the rtc_diff source: 207 * 1) The database value. 208 * 2) The game os value. 209 * 3) The number of seconds from 1970 to 2000. 210 */ 211 212struct saved_params { 213 unsigned int valid; 214 s64 rtc_diff; 215 unsigned int av_multi_out; 216} static saved_params; 217 218static struct property property_rtc_diff = { 219 .name = "linux,rtc_diff", 220 .length = sizeof(saved_params.rtc_diff), 221 .value = &saved_params.rtc_diff, 222}; 223 224static struct property property_av_multi_out = { 225 .name = "linux,av_multi_out", 226 .length = sizeof(saved_params.av_multi_out), 227 .value = &saved_params.av_multi_out, 228}; 229 230 231static DEFINE_MUTEX(os_area_flash_mutex); 232 233static const struct ps3_os_area_flash_ops *os_area_flash_ops; 234 235void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops) 236{ 237 mutex_lock(&os_area_flash_mutex); 238 os_area_flash_ops = ops; 239 mutex_unlock(&os_area_flash_mutex); 240} 241EXPORT_SYMBOL_GPL(ps3_os_area_flash_register); 242 243static ssize_t os_area_flash_read(void *buf, size_t count, loff_t pos) 244{ 245 ssize_t res = -ENODEV; 246 247 mutex_lock(&os_area_flash_mutex); 248 if (os_area_flash_ops) 249 res = os_area_flash_ops->read(buf, count, pos); 250 mutex_unlock(&os_area_flash_mutex); 251 252 return res; 253} 254 255static ssize_t os_area_flash_write(const void *buf, size_t count, loff_t pos) 256{ 257 ssize_t res = -ENODEV; 258 259 mutex_lock(&os_area_flash_mutex); 260 if (os_area_flash_ops) 261 res = os_area_flash_ops->write(buf, count, pos); 262 mutex_unlock(&os_area_flash_mutex); 263 264 return res; 265} 266 267 268/** 269 * os_area_set_property - Add or overwrite a saved_params value to the device tree. 270 * 271 * Overwrites an existing property. 272 */ 273 274static void os_area_set_property(struct device_node *node, 275 struct property *prop) 276{ 277 int result; 278 struct property *tmp = of_find_property(node, prop->name, NULL); 279 280 if (tmp) { 281 pr_debug("%s:%d found %s\n", __func__, __LINE__, prop->name); 282 prom_remove_property(node, tmp); 283 } 284 285 result = prom_add_property(node, prop); 286 287 if (result) 288 pr_debug("%s:%d prom_set_property failed\n", __func__, 289 __LINE__); 290} 291 292/** 293 * os_area_get_property - Get a saved_params value from the device tree. 294 * 295 */ 296 297static void __init os_area_get_property(struct device_node *node, 298 struct property *prop) 299{ 300 const struct property *tmp = of_find_property(node, prop->name, NULL); 301 302 if (tmp) { 303 BUG_ON(prop->length != tmp->length); 304 memcpy(prop->value, tmp->value, prop->length); 305 } else 306 pr_debug("%s:%d not found %s\n", __func__, __LINE__, 307 prop->name); 308} 309 310static void dump_field(char *s, const u8 *field, int size_of_field) 311{ 312#if defined(DEBUG) 313 int i; 314 315 for (i = 0; i < size_of_field; i++) 316 s[i] = isprint(field[i]) ? field[i] : '.'; 317 s[i] = 0; 318#endif 319} 320 321#define dump_header(_a) _dump_header(_a, __func__, __LINE__) 322static void _dump_header(const struct os_area_header *h, const char *func, 323 int line) 324{ 325 char str[sizeof(h->magic_num) + 1]; 326 327 dump_field(str, h->magic_num, sizeof(h->magic_num)); 328 pr_debug("%s:%d: h.magic_num: '%s'\n", func, line, 329 str); 330 pr_debug("%s:%d: h.hdr_version: %u\n", func, line, 331 h->hdr_version); 332 pr_debug("%s:%d: h.db_area_offset: %u\n", func, line, 333 h->db_area_offset); 334 pr_debug("%s:%d: h.ldr_area_offset: %u\n", func, line, 335 h->ldr_area_offset); 336 pr_debug("%s:%d: h.ldr_format: %u\n", func, line, 337 h->ldr_format); 338 pr_debug("%s:%d: h.ldr_size: %xh\n", func, line, 339 h->ldr_size); 340} 341 342#define dump_params(_a) _dump_params(_a, __func__, __LINE__) 343static void _dump_params(const struct os_area_params *p, const char *func, 344 int line) 345{ 346 pr_debug("%s:%d: p.boot_flag: %u\n", func, line, p->boot_flag); 347 pr_debug("%s:%d: p.num_params: %u\n", func, line, p->num_params); 348 pr_debug("%s:%d: p.rtc_diff %lld\n", func, line, p->rtc_diff); 349 pr_debug("%s:%d: p.av_multi_out %u\n", func, line, p->av_multi_out); 350 pr_debug("%s:%d: p.ctrl_button: %u\n", func, line, p->ctrl_button); 351 pr_debug("%s:%d: p.static_ip_addr: %u.%u.%u.%u\n", func, line, 352 p->static_ip_addr[0], p->static_ip_addr[1], 353 p->static_ip_addr[2], p->static_ip_addr[3]); 354 pr_debug("%s:%d: p.network_mask: %u.%u.%u.%u\n", func, line, 355 p->network_mask[0], p->network_mask[1], 356 p->network_mask[2], p->network_mask[3]); 357 pr_debug("%s:%d: p.default_gateway: %u.%u.%u.%u\n", func, line, 358 p->default_gateway[0], p->default_gateway[1], 359 p->default_gateway[2], p->default_gateway[3]); 360 pr_debug("%s:%d: p.dns_primary: %u.%u.%u.%u\n", func, line, 361 p->dns_primary[0], p->dns_primary[1], 362 p->dns_primary[2], p->dns_primary[3]); 363 pr_debug("%s:%d: p.dns_secondary: %u.%u.%u.%u\n", func, line, 364 p->dns_secondary[0], p->dns_secondary[1], 365 p->dns_secondary[2], p->dns_secondary[3]); 366} 367 368static int verify_header(const struct os_area_header *header) 369{ 370 if (memcmp(header->magic_num, OS_AREA_HEADER_MAGIC_NUM, 371 sizeof(header->magic_num))) { 372 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__); 373 return -1; 374 } 375 376 if (header->hdr_version < 1) { 377 pr_debug("%s:%d hdr_version failed\n", __func__, __LINE__); 378 return -1; 379 } 380 381 if (header->db_area_offset > header->ldr_area_offset) { 382 pr_debug("%s:%d offsets failed\n", __func__, __LINE__); 383 return -1; 384 } 385 386 return 0; 387} 388 389static int db_verify(const struct os_area_db *db) 390{ 391 if (memcmp(db->magic_num, OS_AREA_DB_MAGIC_NUM, 392 sizeof(db->magic_num))) { 393 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__); 394 return -EINVAL; 395 } 396 397 if (db->version != 1) { 398 pr_debug("%s:%d version failed\n", __func__, __LINE__); 399 return -EINVAL; 400 } 401 402 return 0; 403} 404 405struct db_index { 406 uint8_t owner:5; 407 uint8_t key:3; 408}; 409 410struct db_iterator { 411 const struct os_area_db *db; 412 struct os_area_db_id match_id; 413 struct db_index *idx; 414 struct db_index *last_idx; 415 union { 416 uint64_t *value_64; 417 uint32_t *value_32; 418 uint16_t *value_16; 419 }; 420}; 421 422static unsigned int db_align_up(unsigned int val, unsigned int size) 423{ 424 return (val + (size - 1)) & (~(size - 1)); 425} 426 427/** 428 * db_for_each_64 - Iterator for 64 bit entries. 429 * 430 * A NULL value for id can be used to match all entries. 431 * OS_AREA_DB_OWNER_ANY and OS_AREA_DB_KEY_ANY can be used to match all. 432 */ 433 434static int db_for_each_64(const struct os_area_db *db, 435 const struct os_area_db_id *match_id, struct db_iterator *i) 436{ 437next: 438 if (!i->db) { 439 i->db = db; 440 i->match_id = match_id ? *match_id : os_area_db_id_any; 441 i->idx = (void *)db + db->index_64; 442 i->last_idx = i->idx + db->count_64; 443 i->value_64 = (void *)db + db->index_64 444 + db_align_up(db->count_64, 8); 445 } else { 446 i->idx++; 447 i->value_64++; 448 } 449 450 if (i->idx >= i->last_idx) { 451 pr_debug("%s:%d: reached end\n", __func__, __LINE__); 452 return 0; 453 } 454 455 if (i->match_id.owner != OS_AREA_DB_OWNER_ANY 456 && i->match_id.owner != (int)i->idx->owner) 457 goto next; 458 if (i->match_id.key != OS_AREA_DB_KEY_ANY 459 && i->match_id.key != (int)i->idx->key) 460 goto next; 461 462 return 1; 463} 464 465static int db_delete_64(struct os_area_db *db, const struct os_area_db_id *id) 466{ 467 struct db_iterator i; 468 469 for (i.db = NULL; db_for_each_64(db, id, &i); ) { 470 471 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__, 472 i.idx->owner, i.idx->key, 473 (unsigned long long)*i.value_64); 474 475 i.idx->owner = 0; 476 i.idx->key = 0; 477 *i.value_64 = 0; 478 } 479 return 0; 480} 481 482static int db_set_64(struct os_area_db *db, const struct os_area_db_id *id, 483 uint64_t value) 484{ 485 struct db_iterator i; 486 487 pr_debug("%s:%d: (%d:%d) <= %llxh\n", __func__, __LINE__, 488 id->owner, id->key, (unsigned long long)value); 489 490 if (!id->owner || id->owner == OS_AREA_DB_OWNER_ANY 491 || id->key == OS_AREA_DB_KEY_ANY) { 492 pr_debug("%s:%d: bad id: (%d:%d)\n", __func__, 493 __LINE__, id->owner, id->key); 494 return -1; 495 } 496 497 db_delete_64(db, id); 498 499 i.db = NULL; 500 if (db_for_each_64(db, &os_area_db_id_empty, &i)) { 501 502 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__, 503 i.idx->owner, i.idx->key, 504 (unsigned long long)*i.value_64); 505 506 i.idx->owner = id->owner; 507 i.idx->key = id->key; 508 *i.value_64 = value; 509 510 pr_debug("%s:%d: set (%d:%d) <= %llxh\n", __func__, __LINE__, 511 i.idx->owner, i.idx->key, 512 (unsigned long long)*i.value_64); 513 return 0; 514 } 515 pr_debug("%s:%d: database full.\n", 516 __func__, __LINE__); 517 return -1; 518} 519 520static int db_get_64(const struct os_area_db *db, 521 const struct os_area_db_id *id, uint64_t *value) 522{ 523 struct db_iterator i; 524 525 i.db = NULL; 526 if (db_for_each_64(db, id, &i)) { 527 *value = *i.value_64; 528 pr_debug("%s:%d: found %lld\n", __func__, __LINE__, 529 (long long int)*i.value_64); 530 return 0; 531 } 532 pr_debug("%s:%d: not found\n", __func__, __LINE__); 533 return -1; 534} 535 536static int db_get_rtc_diff(const struct os_area_db *db, int64_t *rtc_diff) 537{ 538 return db_get_64(db, &os_area_db_id_rtc_diff, (uint64_t*)rtc_diff); 539} 540 541#define dump_db(a) _dump_db(a, __func__, __LINE__) 542static void _dump_db(const struct os_area_db *db, const char *func, 543 int line) 544{ 545 char str[sizeof(db->magic_num) + 1]; 546 547 dump_field(str, db->magic_num, sizeof(db->magic_num)); 548 pr_debug("%s:%d: db.magic_num: '%s'\n", func, line, 549 str); 550 pr_debug("%s:%d: db.version: %u\n", func, line, 551 db->version); 552 pr_debug("%s:%d: db.index_64: %u\n", func, line, 553 db->index_64); 554 pr_debug("%s:%d: db.count_64: %u\n", func, line, 555 db->count_64); 556 pr_debug("%s:%d: db.index_32: %u\n", func, line, 557 db->index_32); 558 pr_debug("%s:%d: db.count_32: %u\n", func, line, 559 db->count_32); 560 pr_debug("%s:%d: db.index_16: %u\n", func, line, 561 db->index_16); 562 pr_debug("%s:%d: db.count_16: %u\n", func, line, 563 db->count_16); 564} 565 566static void os_area_db_init(struct os_area_db *db) 567{ 568 enum { 569 HEADER_SIZE = offsetof(struct os_area_db, _db_data), 570 INDEX_64_COUNT = 64, 571 VALUES_64_COUNT = 57, 572 INDEX_32_COUNT = 64, 573 VALUES_32_COUNT = 57, 574 INDEX_16_COUNT = 64, 575 VALUES_16_COUNT = 57, 576 }; 577 578 memset(db, 0, sizeof(struct os_area_db)); 579 580 memcpy(db->magic_num, OS_AREA_DB_MAGIC_NUM, sizeof(db->magic_num)); 581 db->version = 1; 582 db->index_64 = HEADER_SIZE; 583 db->count_64 = VALUES_64_COUNT; 584 db->index_32 = HEADER_SIZE 585 + INDEX_64_COUNT * sizeof(struct db_index) 586 + VALUES_64_COUNT * sizeof(u64); 587 db->count_32 = VALUES_32_COUNT; 588 db->index_16 = HEADER_SIZE 589 + INDEX_64_COUNT * sizeof(struct db_index) 590 + VALUES_64_COUNT * sizeof(u64) 591 + INDEX_32_COUNT * sizeof(struct db_index) 592 + VALUES_32_COUNT * sizeof(u32); 593 db->count_16 = VALUES_16_COUNT; 594 595 /* Rules to check db layout. */ 596 597 BUILD_BUG_ON(sizeof(struct db_index) != 1); 598 BUILD_BUG_ON(sizeof(struct os_area_db) != 2 * OS_AREA_SEGMENT_SIZE); 599 BUILD_BUG_ON(INDEX_64_COUNT & 0x7); 600 BUILD_BUG_ON(VALUES_64_COUNT > INDEX_64_COUNT); 601 BUILD_BUG_ON(INDEX_32_COUNT & 0x7); 602 BUILD_BUG_ON(VALUES_32_COUNT > INDEX_32_COUNT); 603 BUILD_BUG_ON(INDEX_16_COUNT & 0x7); 604 BUILD_BUG_ON(VALUES_16_COUNT > INDEX_16_COUNT); 605 BUILD_BUG_ON(HEADER_SIZE 606 + INDEX_64_COUNT * sizeof(struct db_index) 607 + VALUES_64_COUNT * sizeof(u64) 608 + INDEX_32_COUNT * sizeof(struct db_index) 609 + VALUES_32_COUNT * sizeof(u32) 610 + INDEX_16_COUNT * sizeof(struct db_index) 611 + VALUES_16_COUNT * sizeof(u16) 612 > sizeof(struct os_area_db)); 613} 614 615/** 616 * update_flash_db - Helper for os_area_queue_work_handler. 617 * 618 */ 619 620static int update_flash_db(void) 621{ 622 const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE; 623 struct os_area_header *header; 624 ssize_t count; 625 int error; 626 loff_t pos; 627 struct os_area_db* db; 628 629 /* Read in header and db from flash. */ 630 631 header = kmalloc(buf_len, GFP_KERNEL); 632 if (!header) { 633 pr_debug("%s: kmalloc failed\n", __func__); 634 return -ENOMEM; 635 } 636 637 count = os_area_flash_read(header, buf_len, 0); 638 if (count < 0) { 639 pr_debug("%s: os_area_flash_read failed %zd\n", __func__, 640 count); 641 error = count; 642 goto fail; 643 } 644 645 pos = header->db_area_offset * OS_AREA_SEGMENT_SIZE; 646 if (count < OS_AREA_SEGMENT_SIZE || verify_header(header) || 647 count < pos) { 648 pr_debug("%s: verify_header failed\n", __func__); 649 dump_header(header); 650 error = -EINVAL; 651 goto fail; 652 } 653 654 /* Now got a good db offset and some maybe good db data. */ 655 656 db = (void *)header + pos; 657 658 error = db_verify(db); 659 if (error) { 660 pr_notice("%s: Verify of flash database failed, formatting.\n", 661 __func__); 662 dump_db(db); 663 os_area_db_init(db); 664 } 665 666 /* Now got good db data. */ 667 668 db_set_64(db, &os_area_db_id_rtc_diff, saved_params.rtc_diff); 669 670 count = os_area_flash_write(db, sizeof(struct os_area_db), pos); 671 if (count < sizeof(struct os_area_db)) { 672 pr_debug("%s: os_area_flash_write failed %zd\n", __func__, 673 count); 674 error = count < 0 ? count : -EIO; 675 } 676 677fail: 678 kfree(header); 679 return error; 680} 681 682/** 683 * os_area_queue_work_handler - Asynchronous write handler. 684 * 685 * An asynchronous write for flash memory and the device tree. Do not 686 * call directly, use os_area_queue_work(). 687 */ 688 689static void os_area_queue_work_handler(struct work_struct *work) 690{ 691 struct device_node *node; 692 int error; 693 694 pr_debug(" -> %s:%d\n", __func__, __LINE__); 695 696 node = of_find_node_by_path("/"); 697 if (node) { 698 os_area_set_property(node, &property_rtc_diff); 699 of_node_put(node); 700 } else 701 pr_debug("%s:%d of_find_node_by_path failed\n", 702 __func__, __LINE__); 703 704 error = update_flash_db(); 705 if (error) 706 pr_warning("%s: Could not update FLASH ROM\n", __func__); 707 708 pr_debug(" <- %s:%d\n", __func__, __LINE__); 709} 710 711static void os_area_queue_work(void) 712{ 713 static DECLARE_WORK(q, os_area_queue_work_handler); 714 715 wmb(); 716 schedule_work(&q); 717} 718 719/** 720 * ps3_os_area_save_params - Copy data from os area mirror to @saved_params. 721 * 722 * For the convenience of the guest the HV makes a copy of the os area in 723 * flash to a high address in the boot memory region and then puts that RAM 724 * address and the byte count into the repository for retrieval by the guest. 725 * We copy the data we want into a static variable and allow the memory setup 726 * by the HV to be claimed by the memblock manager. 727 * 728 * The os area mirror will not be available to a second stage kernel, and 729 * the header verify will fail. In this case, the saved_params values will 730 * be set from flash memory or the passed in device tree in ps3_os_area_init(). 731 */ 732 733void __init ps3_os_area_save_params(void) 734{ 735 int result; 736 u64 lpar_addr; 737 unsigned int size; 738 struct os_area_header *header; 739 struct os_area_params *params; 740 struct os_area_db *db; 741 742 pr_debug(" -> %s:%d\n", __func__, __LINE__); 743 744 result = ps3_repository_read_boot_dat_info(&lpar_addr, &size); 745 746 if (result) { 747 pr_debug("%s:%d ps3_repository_read_boot_dat_info failed\n", 748 __func__, __LINE__); 749 return; 750 } 751 752 header = (struct os_area_header *)__va(lpar_addr); 753 params = (struct os_area_params *)__va(lpar_addr 754 + OS_AREA_SEGMENT_SIZE); 755 756 result = verify_header(header); 757 758 if (result) { 759 /* Second stage kernels exit here. */ 760 pr_debug("%s:%d verify_header failed\n", __func__, __LINE__); 761 dump_header(header); 762 return; 763 } 764 765 db = (struct os_area_db *)__va(lpar_addr 766 + header->db_area_offset * OS_AREA_SEGMENT_SIZE); 767 768 dump_header(header); 769 dump_params(params); 770 dump_db(db); 771 772 result = db_verify(db) || db_get_rtc_diff(db, &saved_params.rtc_diff); 773 if (result) 774 saved_params.rtc_diff = params->rtc_diff ? params->rtc_diff 775 : SECONDS_FROM_1970_TO_2000; 776 saved_params.av_multi_out = params->av_multi_out; 777 saved_params.valid = 1; 778 779 memset(header, 0, sizeof(*header)); 780 781 pr_debug(" <- %s:%d\n", __func__, __LINE__); 782} 783 784/** 785 * ps3_os_area_init - Setup os area device tree properties as needed. 786 */ 787 788void __init ps3_os_area_init(void) 789{ 790 struct device_node *node; 791 792 pr_debug(" -> %s:%d\n", __func__, __LINE__); 793 794 node = of_find_node_by_path("/"); 795 796 if (!saved_params.valid && node) { 797 /* Second stage kernels should have a dt entry. */ 798 os_area_get_property(node, &property_rtc_diff); 799 os_area_get_property(node, &property_av_multi_out); 800 } 801 802 if(!saved_params.rtc_diff) 803 saved_params.rtc_diff = SECONDS_FROM_1970_TO_2000; 804 805 if (node) { 806 os_area_set_property(node, &property_rtc_diff); 807 os_area_set_property(node, &property_av_multi_out); 808 of_node_put(node); 809 } else 810 pr_debug("%s:%d of_find_node_by_path failed\n", 811 __func__, __LINE__); 812 813 pr_debug(" <- %s:%d\n", __func__, __LINE__); 814} 815 816/** 817 * ps3_os_area_get_rtc_diff - Returns the rtc diff value. 818 */ 819 820u64 ps3_os_area_get_rtc_diff(void) 821{ 822 return saved_params.rtc_diff; 823} 824EXPORT_SYMBOL_GPL(ps3_os_area_get_rtc_diff); 825 826/** 827 * ps3_os_area_set_rtc_diff - Set the rtc diff value. 828 * 829 * An asynchronous write is needed to support writing updates from 830 * the timer interrupt context. 831 */ 832 833void ps3_os_area_set_rtc_diff(u64 rtc_diff) 834{ 835 if (saved_params.rtc_diff != rtc_diff) { 836 saved_params.rtc_diff = rtc_diff; 837 os_area_queue_work(); 838 } 839} 840EXPORT_SYMBOL_GPL(ps3_os_area_set_rtc_diff); 841 842/** 843 * ps3_os_area_get_av_multi_out - Returns the default video mode. 844 */ 845 846enum ps3_param_av_multi_out ps3_os_area_get_av_multi_out(void) 847{ 848 return saved_params.av_multi_out; 849} 850EXPORT_SYMBOL_GPL(ps3_os_area_get_av_multi_out); 851