linux/arch/powerpc/platforms/ps3/os-area.c
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   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
  28#include <asm/lmb.h>
  29
  30#include "platform.h"
  31
  32enum {
  33        OS_AREA_SEGMENT_SIZE = 0X200,
  34};
  35
  36enum os_area_ldr_format {
  37        HEADER_LDR_FORMAT_RAW = 0,
  38        HEADER_LDR_FORMAT_GZIP = 1,
  39};
  40
  41#define OS_AREA_HEADER_MAGIC_NUM "cell_ext_os_area"
  42
  43/**
  44 * struct os_area_header - os area header segment.
  45 * @magic_num: Always 'cell_ext_os_area'.
  46 * @hdr_version: Header format version number.
  47 * @db_area_offset: Starting segment number of other os database area.
  48 * @ldr_area_offset: Starting segment number of bootloader image area.
  49 * @ldr_format: HEADER_LDR_FORMAT flag.
  50 * @ldr_size: Size of bootloader image in bytes.
  51 *
  52 * Note that the docs refer to area offsets.  These are offsets in units of
  53 * segments from the start of the os area (top of the header).  These are
  54 * better thought of as segment numbers.  The os area of the os area is
  55 * reserved for the os image.
  56 */
  57
  58struct os_area_header {
  59        u8 magic_num[16];
  60        u32 hdr_version;
  61        u32 db_area_offset;
  62        u32 ldr_area_offset;
  63        u32 _reserved_1;
  64        u32 ldr_format;
  65        u32 ldr_size;
  66        u32 _reserved_2[6];
  67};
  68
  69enum os_area_boot_flag {
  70        PARAM_BOOT_FLAG_GAME_OS = 0,
  71        PARAM_BOOT_FLAG_OTHER_OS = 1,
  72};
  73
  74enum os_area_ctrl_button {
  75        PARAM_CTRL_BUTTON_O_IS_YES = 0,
  76        PARAM_CTRL_BUTTON_X_IS_YES = 1,
  77};
  78
  79/**
  80 * struct os_area_params - os area params segment.
  81 * @boot_flag: User preference of operating system, PARAM_BOOT_FLAG flag.
  82 * @num_params: Number of params in this (params) segment.
  83 * @rtc_diff: Difference in seconds between 1970 and the ps3 rtc value.
  84 * @av_multi_out: User preference of AV output, PARAM_AV_MULTI_OUT flag.
  85 * @ctrl_button: User preference of controller button config, PARAM_CTRL_BUTTON
  86 *      flag.
  87 * @static_ip_addr: User preference of static IP address.
  88 * @network_mask: User preference of static network mask.
  89 * @default_gateway: User preference of static default gateway.
  90 * @dns_primary: User preference of static primary dns server.
  91 * @dns_secondary: User preference of static secondary dns server.
  92 *
  93 * The ps3 rtc maintains a read-only value that approximates seconds since
  94 * 2000-01-01 00:00:00 UTC.
  95 *
  96 * User preference of zero for static_ip_addr means use dhcp.
  97 */
  98
  99struct os_area_params {
 100        u32 boot_flag;
 101        u32 _reserved_1[3];
 102        u32 num_params;
 103        u32 _reserved_2[3];
 104        /* param 0 */
 105        s64 rtc_diff;
 106        u8 av_multi_out;
 107        u8 ctrl_button;
 108        u8 _reserved_3[6];
 109        /* param 1 */
 110        u8 static_ip_addr[4];
 111        u8 network_mask[4];
 112        u8 default_gateway[4];
 113        u8 _reserved_4[4];
 114        /* param 2 */
 115        u8 dns_primary[4];
 116        u8 dns_secondary[4];
 117        u8 _reserved_5[8];
 118};
 119
 120#define OS_AREA_DB_MAGIC_NUM "-db-"
 121
 122/**
 123 * struct os_area_db - Shared flash memory database.
 124 * @magic_num: Always '-db-'.
 125 * @version: os_area_db format version number.
 126 * @index_64: byte offset of the database id index for 64 bit variables.
 127 * @count_64: number of usable 64 bit index entries
 128 * @index_32: byte offset of the database id index for 32 bit variables.
 129 * @count_32: number of usable 32 bit index entries
 130 * @index_16: byte offset of the database id index for 16 bit variables.
 131 * @count_16: number of usable 16 bit index entries
 132 *
 133 * Flash rom storage for exclusive use by guests running in the other os lpar.
 134 * The current system configuration allocates 1K (two segments) for other os
 135 * use.
 136 */
 137
 138struct os_area_db {
 139        u8 magic_num[4];
 140        u16 version;
 141        u16 _reserved_1;
 142        u16 index_64;
 143        u16 count_64;
 144        u16 index_32;
 145        u16 count_32;
 146        u16 index_16;
 147        u16 count_16;
 148        u32 _reserved_2;
 149        u8 _db_data[1000];
 150};
 151
 152/**
 153 * enum os_area_db_owner - Data owners.
 154 */
 155
 156enum os_area_db_owner {
 157        OS_AREA_DB_OWNER_ANY = -1,
 158        OS_AREA_DB_OWNER_NONE = 0,
 159        OS_AREA_DB_OWNER_PROTOTYPE = 1,
 160        OS_AREA_DB_OWNER_LINUX = 2,
 161        OS_AREA_DB_OWNER_PETITBOOT = 3,
 162        OS_AREA_DB_OWNER_MAX = 32,
 163};
 164
 165enum os_area_db_key {
 166        OS_AREA_DB_KEY_ANY = -1,
 167        OS_AREA_DB_KEY_NONE = 0,
 168        OS_AREA_DB_KEY_RTC_DIFF = 1,
 169        OS_AREA_DB_KEY_VIDEO_MODE = 2,
 170        OS_AREA_DB_KEY_MAX = 8,
 171};
 172
 173struct os_area_db_id {
 174        int owner;
 175        int key;
 176};
 177
 178static const struct os_area_db_id os_area_db_id_empty = {
 179        .owner = OS_AREA_DB_OWNER_NONE,
 180        .key = OS_AREA_DB_KEY_NONE
 181};
 182
 183static const struct os_area_db_id os_area_db_id_any = {
 184        .owner = OS_AREA_DB_OWNER_ANY,
 185        .key = OS_AREA_DB_KEY_ANY
 186};
 187
 188static const struct os_area_db_id os_area_db_id_rtc_diff = {
 189        .owner = OS_AREA_DB_OWNER_LINUX,
 190        .key = OS_AREA_DB_KEY_RTC_DIFF
 191};
 192
 193static const struct os_area_db_id os_area_db_id_video_mode = {
 194        .owner = OS_AREA_DB_OWNER_LINUX,
 195        .key = OS_AREA_DB_KEY_VIDEO_MODE
 196};
 197
 198#define SECONDS_FROM_1970_TO_2000 946684800LL
 199
 200/**
 201 * struct saved_params - Static working copies of data from the PS3 'os area'.
 202 *
 203 * The order of preference we use for the rtc_diff source:
 204 *  1) The database value.
 205 *  2) The game os value.
 206 *  3) The number of seconds from 1970 to 2000.
 207 */
 208
 209struct saved_params {
 210        unsigned int valid;
 211        s64 rtc_diff;
 212        unsigned int av_multi_out;
 213} static saved_params;
 214
 215static struct property property_rtc_diff = {
 216        .name = "linux,rtc_diff",
 217        .length = sizeof(saved_params.rtc_diff),
 218        .value = &saved_params.rtc_diff,
 219};
 220
 221static struct property property_av_multi_out = {
 222        .name = "linux,av_multi_out",
 223        .length = sizeof(saved_params.av_multi_out),
 224        .value = &saved_params.av_multi_out,
 225};
 226
 227/**
 228 * os_area_set_property - Add or overwrite a saved_params value to the device tree.
 229 *
 230 * Overwrites an existing property.
 231 */
 232
 233static void os_area_set_property(struct device_node *node,
 234        struct property *prop)
 235{
 236        int result;
 237        struct property *tmp = of_find_property(node, prop->name, NULL);
 238
 239        if (tmp) {
 240                pr_debug("%s:%d found %s\n", __func__, __LINE__, prop->name);
 241                prom_remove_property(node, tmp);
 242        }
 243
 244        result = prom_add_property(node, prop);
 245
 246        if (result)
 247                pr_debug("%s:%d prom_set_property failed\n", __func__,
 248                        __LINE__);
 249}
 250
 251/**
 252 * os_area_get_property - Get a saved_params value from the device tree.
 253 *
 254 */
 255
 256static void __init os_area_get_property(struct device_node *node,
 257        struct property *prop)
 258{
 259        const struct property *tmp = of_find_property(node, prop->name, NULL);
 260
 261        if (tmp) {
 262                BUG_ON(prop->length != tmp->length);
 263                memcpy(prop->value, tmp->value, prop->length);
 264        } else
 265                pr_debug("%s:%d not found %s\n", __func__, __LINE__,
 266                        prop->name);
 267}
 268
 269static void dump_field(char *s, const u8 *field, int size_of_field)
 270{
 271#if defined(DEBUG)
 272        int i;
 273
 274        for (i = 0; i < size_of_field; i++)
 275                s[i] = isprint(field[i]) ? field[i] : '.';
 276        s[i] = 0;
 277#endif
 278}
 279
 280#define dump_header(_a) _dump_header(_a, __func__, __LINE__)
 281static void _dump_header(const struct os_area_header *h, const char *func,
 282        int line)
 283{
 284        char str[sizeof(h->magic_num) + 1];
 285
 286        dump_field(str, h->magic_num, sizeof(h->magic_num));
 287        pr_debug("%s:%d: h.magic_num:       '%s'\n", func, line,
 288                str);
 289        pr_debug("%s:%d: h.hdr_version:     %u\n", func, line,
 290                h->hdr_version);
 291        pr_debug("%s:%d: h.db_area_offset:  %u\n", func, line,
 292                h->db_area_offset);
 293        pr_debug("%s:%d: h.ldr_area_offset: %u\n", func, line,
 294                h->ldr_area_offset);
 295        pr_debug("%s:%d: h.ldr_format:      %u\n", func, line,
 296                h->ldr_format);
 297        pr_debug("%s:%d: h.ldr_size:        %xh\n", func, line,
 298                h->ldr_size);
 299}
 300
 301#define dump_params(_a) _dump_params(_a, __func__, __LINE__)
 302static void _dump_params(const struct os_area_params *p, const char *func,
 303        int line)
 304{
 305        pr_debug("%s:%d: p.boot_flag:       %u\n", func, line, p->boot_flag);
 306        pr_debug("%s:%d: p.num_params:      %u\n", func, line, p->num_params);
 307        pr_debug("%s:%d: p.rtc_diff         %ld\n", func, line, p->rtc_diff);
 308        pr_debug("%s:%d: p.av_multi_out     %u\n", func, line, p->av_multi_out);
 309        pr_debug("%s:%d: p.ctrl_button:     %u\n", func, line, p->ctrl_button);
 310        pr_debug("%s:%d: p.static_ip_addr:  %u.%u.%u.%u\n", func, line,
 311                p->static_ip_addr[0], p->static_ip_addr[1],
 312                p->static_ip_addr[2], p->static_ip_addr[3]);
 313        pr_debug("%s:%d: p.network_mask:    %u.%u.%u.%u\n", func, line,
 314                p->network_mask[0], p->network_mask[1],
 315                p->network_mask[2], p->network_mask[3]);
 316        pr_debug("%s:%d: p.default_gateway: %u.%u.%u.%u\n", func, line,
 317                p->default_gateway[0], p->default_gateway[1],
 318                p->default_gateway[2], p->default_gateway[3]);
 319        pr_debug("%s:%d: p.dns_primary:     %u.%u.%u.%u\n", func, line,
 320                p->dns_primary[0], p->dns_primary[1],
 321                p->dns_primary[2], p->dns_primary[3]);
 322        pr_debug("%s:%d: p.dns_secondary:   %u.%u.%u.%u\n", func, line,
 323                p->dns_secondary[0], p->dns_secondary[1],
 324                p->dns_secondary[2], p->dns_secondary[3]);
 325}
 326
 327static int verify_header(const struct os_area_header *header)
 328{
 329        if (memcmp(header->magic_num, OS_AREA_HEADER_MAGIC_NUM,
 330                sizeof(header->magic_num))) {
 331                pr_debug("%s:%d magic_num failed\n", __func__, __LINE__);
 332                return -1;
 333        }
 334
 335        if (header->hdr_version < 1) {
 336                pr_debug("%s:%d hdr_version failed\n", __func__, __LINE__);
 337                return -1;
 338        }
 339
 340        if (header->db_area_offset > header->ldr_area_offset) {
 341                pr_debug("%s:%d offsets failed\n", __func__, __LINE__);
 342                return -1;
 343        }
 344
 345        return 0;
 346}
 347
 348static int db_verify(const struct os_area_db *db)
 349{
 350        if (memcmp(db->magic_num, OS_AREA_DB_MAGIC_NUM,
 351                sizeof(db->magic_num))) {
 352                pr_debug("%s:%d magic_num failed\n", __func__, __LINE__);
 353                return -1;
 354        }
 355
 356        if (db->version != 1) {
 357                pr_debug("%s:%d version failed\n", __func__, __LINE__);
 358                return -1;
 359        }
 360
 361        return 0;
 362}
 363
 364struct db_index {
 365       uint8_t owner:5;
 366       uint8_t key:3;
 367};
 368
 369struct db_iterator {
 370        const struct os_area_db *db;
 371        struct os_area_db_id match_id;
 372        struct db_index *idx;
 373        struct db_index *last_idx;
 374        union {
 375                uint64_t *value_64;
 376                uint32_t *value_32;
 377                uint16_t *value_16;
 378        };
 379};
 380
 381static unsigned int db_align_up(unsigned int val, unsigned int size)
 382{
 383        return (val + (size - 1)) & (~(size - 1));
 384}
 385
 386/**
 387 * db_for_each_64 - Iterator for 64 bit entries.
 388 *
 389 * A NULL value for id can be used to match all entries.
 390 * OS_AREA_DB_OWNER_ANY and OS_AREA_DB_KEY_ANY can be used to match all.
 391 */
 392
 393static int db_for_each_64(const struct os_area_db *db,
 394        const struct os_area_db_id *match_id, struct db_iterator *i)
 395{
 396next:
 397        if (!i->db) {
 398                i->db = db;
 399                i->match_id = match_id ? *match_id : os_area_db_id_any;
 400                i->idx = (void *)db + db->index_64;
 401                i->last_idx = i->idx + db->count_64;
 402                i->value_64 = (void *)db + db->index_64
 403                        + db_align_up(db->count_64, 8);
 404        } else {
 405                i->idx++;
 406                i->value_64++;
 407        }
 408
 409        if (i->idx >= i->last_idx) {
 410                pr_debug("%s:%d: reached end\n", __func__, __LINE__);
 411                return 0;
 412        }
 413
 414        if (i->match_id.owner != OS_AREA_DB_OWNER_ANY
 415                && i->match_id.owner != (int)i->idx->owner)
 416                goto next;
 417        if (i->match_id.key != OS_AREA_DB_KEY_ANY
 418                && i->match_id.key != (int)i->idx->key)
 419                goto next;
 420
 421        return 1;
 422}
 423
 424static int db_delete_64(struct os_area_db *db, const struct os_area_db_id *id)
 425{
 426        struct db_iterator i;
 427
 428        for (i.db = NULL; db_for_each_64(db, id, &i); ) {
 429
 430                pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__,
 431                        i.idx->owner, i.idx->key,
 432                        (unsigned long long)*i.value_64);
 433
 434                i.idx->owner = 0;
 435                i.idx->key = 0;
 436                *i.value_64 = 0;
 437        }
 438        return 0;
 439}
 440
 441static int db_set_64(struct os_area_db *db, const struct os_area_db_id *id,
 442        uint64_t value)
 443{
 444        struct db_iterator i;
 445
 446        pr_debug("%s:%d: (%d:%d) <= %llxh\n", __func__, __LINE__,
 447                id->owner, id->key, (unsigned long long)value);
 448
 449        if (!id->owner || id->owner == OS_AREA_DB_OWNER_ANY
 450                || id->key == OS_AREA_DB_KEY_ANY) {
 451                pr_debug("%s:%d: bad id: (%d:%d)\n", __func__,
 452                        __LINE__, id->owner, id->key);
 453                return -1;
 454        }
 455
 456        db_delete_64(db, id);
 457
 458        i.db = NULL;
 459        if (db_for_each_64(db, &os_area_db_id_empty, &i)) {
 460
 461                pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__,
 462                        i.idx->owner, i.idx->key,
 463                        (unsigned long long)*i.value_64);
 464
 465                i.idx->owner = id->owner;
 466                i.idx->key = id->key;
 467                *i.value_64 = value;
 468
 469                pr_debug("%s:%d: set (%d:%d) <= %llxh\n", __func__, __LINE__,
 470                        i.idx->owner, i.idx->key,
 471                        (unsigned long long)*i.value_64);
 472                return 0;
 473        }
 474        pr_debug("%s:%d: database full.\n",
 475                __func__, __LINE__);
 476        return -1;
 477}
 478
 479static int db_get_64(const struct os_area_db *db,
 480        const struct os_area_db_id *id, uint64_t *value)
 481{
 482        struct db_iterator i;
 483
 484        i.db = NULL;
 485        if (db_for_each_64(db, id, &i)) {
 486                *value = *i.value_64;
 487                pr_debug("%s:%d: found %lld\n", __func__, __LINE__,
 488                                (long long int)*i.value_64);
 489                return 0;
 490        }
 491        pr_debug("%s:%d: not found\n", __func__, __LINE__);
 492        return -1;
 493}
 494
 495static int db_get_rtc_diff(const struct os_area_db *db, int64_t *rtc_diff)
 496{
 497        return db_get_64(db, &os_area_db_id_rtc_diff, (uint64_t*)rtc_diff);
 498}
 499
 500#define dump_db(a) _dump_db(a, __func__, __LINE__)
 501static void _dump_db(const struct os_area_db *db, const char *func,
 502        int line)
 503{
 504        char str[sizeof(db->magic_num) + 1];
 505
 506        dump_field(str, db->magic_num, sizeof(db->magic_num));
 507        pr_debug("%s:%d: db.magic_num:      '%s'\n", func, line,
 508                str);
 509        pr_debug("%s:%d: db.version:         %u\n", func, line,
 510                db->version);
 511        pr_debug("%s:%d: db.index_64:        %u\n", func, line,
 512                db->index_64);
 513        pr_debug("%s:%d: db.count_64:        %u\n", func, line,
 514                db->count_64);
 515        pr_debug("%s:%d: db.index_32:        %u\n", func, line,
 516                db->index_32);
 517        pr_debug("%s:%d: db.count_32:        %u\n", func, line,
 518                db->count_32);
 519        pr_debug("%s:%d: db.index_16:        %u\n", func, line,
 520                db->index_16);
 521        pr_debug("%s:%d: db.count_16:        %u\n", func, line,
 522                db->count_16);
 523}
 524
 525static void os_area_db_init(struct os_area_db *db)
 526{
 527        enum {
 528                HEADER_SIZE = offsetof(struct os_area_db, _db_data),
 529                INDEX_64_COUNT = 64,
 530                VALUES_64_COUNT = 57,
 531                INDEX_32_COUNT = 64,
 532                VALUES_32_COUNT = 57,
 533                INDEX_16_COUNT = 64,
 534                VALUES_16_COUNT = 57,
 535        };
 536
 537        memset(db, 0, sizeof(struct os_area_db));
 538
 539        memcpy(db->magic_num, OS_AREA_DB_MAGIC_NUM, sizeof(db->magic_num));
 540        db->version = 1;
 541        db->index_64 = HEADER_SIZE;
 542        db->count_64 = VALUES_64_COUNT;
 543        db->index_32 = HEADER_SIZE
 544                        + INDEX_64_COUNT * sizeof(struct db_index)
 545                        + VALUES_64_COUNT * sizeof(u64);
 546        db->count_32 = VALUES_32_COUNT;
 547        db->index_16 = HEADER_SIZE
 548                        + INDEX_64_COUNT * sizeof(struct db_index)
 549                        + VALUES_64_COUNT * sizeof(u64)
 550                        + INDEX_32_COUNT * sizeof(struct db_index)
 551                        + VALUES_32_COUNT * sizeof(u32);
 552        db->count_16 = VALUES_16_COUNT;
 553
 554        /* Rules to check db layout. */
 555
 556        BUILD_BUG_ON(sizeof(struct db_index) != 1);
 557        BUILD_BUG_ON(sizeof(struct os_area_db) != 2 * OS_AREA_SEGMENT_SIZE);
 558        BUILD_BUG_ON(INDEX_64_COUNT & 0x7);
 559        BUILD_BUG_ON(VALUES_64_COUNT > INDEX_64_COUNT);
 560        BUILD_BUG_ON(INDEX_32_COUNT & 0x7);
 561        BUILD_BUG_ON(VALUES_32_COUNT > INDEX_32_COUNT);
 562        BUILD_BUG_ON(INDEX_16_COUNT & 0x7);
 563        BUILD_BUG_ON(VALUES_16_COUNT > INDEX_16_COUNT);
 564        BUILD_BUG_ON(HEADER_SIZE
 565                        + INDEX_64_COUNT * sizeof(struct db_index)
 566                        + VALUES_64_COUNT * sizeof(u64)
 567                        + INDEX_32_COUNT * sizeof(struct db_index)
 568                        + VALUES_32_COUNT * sizeof(u32)
 569                        + INDEX_16_COUNT * sizeof(struct db_index)
 570                        + VALUES_16_COUNT * sizeof(u16)
 571                        > sizeof(struct os_area_db));
 572}
 573
 574/**
 575 * update_flash_db - Helper for os_area_queue_work_handler.
 576 *
 577 */
 578
 579static void update_flash_db(void)
 580{
 581        int result;
 582        int file;
 583        off_t offset;
 584        ssize_t count;
 585        static const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE;
 586        const struct os_area_header *header;
 587        struct os_area_db* db;
 588
 589        /* Read in header and db from flash. */
 590
 591        file = sys_open("/dev/ps3flash", O_RDWR, 0);
 592
 593        if (file < 0) {
 594                pr_debug("%s:%d sys_open failed\n", __func__, __LINE__);
 595                goto fail_open;
 596        }
 597
 598        header = kmalloc(buf_len, GFP_KERNEL);
 599
 600        if (!header) {
 601                pr_debug("%s:%d kmalloc failed\n", __func__, __LINE__);
 602                goto fail_malloc;
 603        }
 604
 605        offset = sys_lseek(file, 0, SEEK_SET);
 606
 607        if (offset != 0) {
 608                pr_debug("%s:%d sys_lseek failed\n", __func__, __LINE__);
 609                goto fail_header_seek;
 610        }
 611
 612        count = sys_read(file, (char __user *)header, buf_len);
 613
 614        result = count < OS_AREA_SEGMENT_SIZE || verify_header(header)
 615                || count < header->db_area_offset * OS_AREA_SEGMENT_SIZE;
 616
 617        if (result) {
 618                pr_debug("%s:%d verify_header failed\n", __func__, __LINE__);
 619                dump_header(header);
 620                goto fail_header;
 621        }
 622
 623        /* Now got a good db offset and some maybe good db data. */
 624
 625        db = (void*)header + header->db_area_offset * OS_AREA_SEGMENT_SIZE;
 626
 627        result = db_verify(db);
 628
 629        if (result) {
 630                printk(KERN_NOTICE "%s:%d: Verify of flash database failed, "
 631                        "formatting.\n", __func__, __LINE__);
 632                dump_db(db);
 633                os_area_db_init(db);
 634        }
 635
 636        /* Now got good db data. */
 637
 638        db_set_64(db, &os_area_db_id_rtc_diff, saved_params.rtc_diff);
 639
 640        offset = sys_lseek(file, header->db_area_offset * OS_AREA_SEGMENT_SIZE,
 641                SEEK_SET);
 642
 643        if (offset != header->db_area_offset * OS_AREA_SEGMENT_SIZE) {
 644                pr_debug("%s:%d sys_lseek failed\n", __func__, __LINE__);
 645                goto fail_db_seek;
 646        }
 647
 648        count = sys_write(file, (const char __user *)db,
 649                sizeof(struct os_area_db));
 650
 651        if (count < sizeof(struct os_area_db)) {
 652                pr_debug("%s:%d sys_write failed\n", __func__, __LINE__);
 653        }
 654
 655fail_db_seek:
 656fail_header:
 657fail_header_seek:
 658        kfree(header);
 659fail_malloc:
 660        sys_close(file);
 661fail_open:
 662        return;
 663}
 664
 665/**
 666 * os_area_queue_work_handler - Asynchronous write handler.
 667 *
 668 * An asynchronous write for flash memory and the device tree.  Do not
 669 * call directly, use os_area_queue_work().
 670 */
 671
 672static void os_area_queue_work_handler(struct work_struct *work)
 673{
 674        struct device_node *node;
 675
 676        pr_debug(" -> %s:%d\n", __func__, __LINE__);
 677
 678        node = of_find_node_by_path("/");
 679
 680        if (node) {
 681                os_area_set_property(node, &property_rtc_diff);
 682                of_node_put(node);
 683        } else
 684                pr_debug("%s:%d of_find_node_by_path failed\n",
 685                        __func__, __LINE__);
 686
 687#if defined(CONFIG_PS3_FLASH) || defined(CONFIG_PS3_FLASH_MODULE)
 688        update_flash_db();
 689#else
 690        printk(KERN_WARNING "%s:%d: No flash rom driver configured.\n",
 691                __func__, __LINE__);
 692#endif
 693        pr_debug(" <- %s:%d\n", __func__, __LINE__);
 694}
 695
 696static void os_area_queue_work(void)
 697{
 698        static DECLARE_WORK(q, os_area_queue_work_handler);
 699
 700        wmb();
 701        schedule_work(&q);
 702}
 703
 704/**
 705 * ps3_os_area_save_params - Copy data from os area mirror to @saved_params.
 706 *
 707 * For the convenience of the guest the HV makes a copy of the os area in
 708 * flash to a high address in the boot memory region and then puts that RAM
 709 * address and the byte count into the repository for retrieval by the guest.
 710 * We copy the data we want into a static variable and allow the memory setup
 711 * by the HV to be claimed by the lmb manager.
 712 *
 713 * The os area mirror will not be available to a second stage kernel, and
 714 * the header verify will fail.  In this case, the saved_params values will
 715 * be set from flash memory or the passed in device tree in ps3_os_area_init().
 716 */
 717
 718void __init ps3_os_area_save_params(void)
 719{
 720        int result;
 721        u64 lpar_addr;
 722        unsigned int size;
 723        struct os_area_header *header;
 724        struct os_area_params *params;
 725        struct os_area_db *db;
 726
 727        pr_debug(" -> %s:%d\n", __func__, __LINE__);
 728
 729        result = ps3_repository_read_boot_dat_info(&lpar_addr, &size);
 730
 731        if (result) {
 732                pr_debug("%s:%d ps3_repository_read_boot_dat_info failed\n",
 733                        __func__, __LINE__);
 734                return;
 735        }
 736
 737        header = (struct os_area_header *)__va(lpar_addr);
 738        params = (struct os_area_params *)__va(lpar_addr
 739                + OS_AREA_SEGMENT_SIZE);
 740
 741        result = verify_header(header);
 742
 743        if (result) {
 744                /* Second stage kernels exit here. */
 745                pr_debug("%s:%d verify_header failed\n", __func__, __LINE__);
 746                dump_header(header);
 747                return;
 748        }
 749
 750        db = (struct os_area_db *)__va(lpar_addr
 751                + header->db_area_offset * OS_AREA_SEGMENT_SIZE);
 752
 753        dump_header(header);
 754        dump_params(params);
 755        dump_db(db);
 756
 757        result = db_verify(db) || db_get_rtc_diff(db, &saved_params.rtc_diff);
 758        if (result)
 759                saved_params.rtc_diff = params->rtc_diff ? params->rtc_diff
 760                        : SECONDS_FROM_1970_TO_2000;
 761        saved_params.av_multi_out = params->av_multi_out;
 762        saved_params.valid = 1;
 763
 764        memset(header, 0, sizeof(*header));
 765
 766        pr_debug(" <- %s:%d\n", __func__, __LINE__);
 767}
 768
 769/**
 770 * ps3_os_area_init - Setup os area device tree properties as needed.
 771 */
 772
 773void __init ps3_os_area_init(void)
 774{
 775        struct device_node *node;
 776
 777        pr_debug(" -> %s:%d\n", __func__, __LINE__);
 778
 779        node = of_find_node_by_path("/");
 780
 781        if (!saved_params.valid && node) {
 782                /* Second stage kernels should have a dt entry. */
 783                os_area_get_property(node, &property_rtc_diff);
 784                os_area_get_property(node, &property_av_multi_out);
 785        }
 786
 787        if(!saved_params.rtc_diff)
 788                saved_params.rtc_diff = SECONDS_FROM_1970_TO_2000;
 789
 790        if (node) {
 791                os_area_set_property(node, &property_rtc_diff);
 792                os_area_set_property(node, &property_av_multi_out);
 793                of_node_put(node);
 794        } else
 795                pr_debug("%s:%d of_find_node_by_path failed\n",
 796                        __func__, __LINE__);
 797
 798        pr_debug(" <- %s:%d\n", __func__, __LINE__);
 799}
 800
 801/**
 802 * ps3_os_area_get_rtc_diff - Returns the rtc diff value.
 803 */
 804
 805u64 ps3_os_area_get_rtc_diff(void)
 806{
 807        return saved_params.rtc_diff;
 808}
 809
 810/**
 811 * ps3_os_area_set_rtc_diff - Set the rtc diff value.
 812 *
 813 * An asynchronous write is needed to support writing updates from
 814 * the timer interrupt context.
 815 */
 816
 817void ps3_os_area_set_rtc_diff(u64 rtc_diff)
 818{
 819        if (saved_params.rtc_diff != rtc_diff) {
 820                saved_params.rtc_diff = rtc_diff;
 821                os_area_queue_work();
 822        }
 823}
 824
 825/**
 826 * ps3_os_area_get_av_multi_out - Returns the default video mode.
 827 */
 828
 829enum ps3_param_av_multi_out ps3_os_area_get_av_multi_out(void)
 830{
 831    return saved_params.av_multi_out;
 832}
 833EXPORT_SYMBOL_GPL(ps3_os_area_get_av_multi_out);
 834