arch/ppc64/kernel/rtas.c

   1 /*
   2  *
   3  * Procedures for interfacing to the RTAS on CHRP machines.
   4  *
   5  * Peter Bergner, IBM   March 2001.
   6  * Copyright (C) 2001 IBM.
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 #include <stdarg.h>
  15 #include <linux/kernel.h>
  16 #include <linux/types.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20
  21 #include <asm/prom.h>
  22 #include <asm/rtas.h>
  23 #include <asm/semaphore.h>
  24 #include <asm/machdep.h>
  25 #include <asm/page.h>
  26 #include <asm/param.h>
  27 #include <asm/system.h>
  28 #include <asm/abs_addr.h>
  29 #include <asm/udbg.h>
  30 #include <asm/delay.h>
  31 #include <asm/uaccess.h>
  32 #include <asm/systemcfg.h>
  33 #include <asm/ppcdebug.h>
  34
  35 struct flash_block_list_header rtas_firmware_flash_list = {0, NULL};
  36
  37 struct rtas_t rtas = {
  38         .lock = SPIN_LOCK_UNLOCKED
  39 };
  40
  41 EXPORT_SYMBOL(rtas);
  42
  43 char rtas_err_buf[RTAS_ERROR_LOG_MAX];
  44
  45 DEFINE_SPINLOCK(rtas_data_buf_lock);
  46 char rtas_data_buf[RTAS_DATA_BUF_SIZE]__page_aligned;
  47 unsigned long rtas_rmo_buf;
  48
  49 void
  50 call_rtas_display_status(unsigned char c)
  51 {
  52         struct rtas_args *args = &rtas.args;
  53         unsigned long s;
  54
  55         if (!rtas.base)
  56                 return;
  57         spin_lock_irqsave(&rtas.lock, s);
  58
  59         args->token = 10;
  60         args->nargs = 1;
  61         args->nret  = 1;
  62         args->rets  = (rtas_arg_t *)&(args->args[1]);
  63         args->args[0] = (int)c;
  64
  65         enter_rtas(__pa(args));
  66
  67         spin_unlock_irqrestore(&rtas.lock, s);
  68 }
  69
  70 void
  71 call_rtas_display_status_delay(unsigned char c)
  72 {
  73         static int pending_newline = 0;  /* did last write end with unprinted newline? */
  74         static int width = 16;
  75
  76         if (c == '\n') {
  77                 while (width-- > 0)
  78                         call_rtas_display_status(' ');
  79                 width = 16;
  80                 udelay(500000);
  81                 pending_newline = 1;
  82         } else {
  83                 if (pending_newline) {
  84                         call_rtas_display_status('\r');
  85                         call_rtas_display_status('\n');
  86                 }
  87                 pending_newline = 0;
  88                 if (width--) {
  89                         call_rtas_display_status(c);
  90                         udelay(10000);
  91                 }
  92         }
  93 }
  94
  95 void
  96 rtas_progress(char *s, unsigned short hex)
  97 {
  98         struct device_node *root;
  99         int width, *p;
 100         char *os;
 101         static int display_character, set_indicator;
 102         static int display_width, display_lines, *row_width, form_feed;
 103         static DEFINE_SPINLOCK(progress_lock);
 104         static int current_line;
 105         static int pending_newline = 0;  /* did last write end with unprinted newline? */
 106
 107         if (!rtas.base)
 108                 return;
 109
 110         if (display_width == 0) {
 111                 display_width = 0x10;
 112                 if ((root = find_path_device("/rtas"))) {
 113                         if ((p = (unsigned int *)get_property(root,
 114                                         "ibm,display-line-length", NULL)))
 115                                 display_width = *p;
 116                         if ((p = (unsigned int *)get_property(root,
 117                                         "ibm,form-feed", NULL)))
 118                                 form_feed = *p;
 119                         if ((p = (unsigned int *)get_property(root,
 120                                         "ibm,display-number-of-lines", NULL)))
 121                                 display_lines = *p;
 122                         row_width = (unsigned int *)get_property(root,
 123                                         "ibm,display-truncation-length", NULL);
 124                 }
 125                 display_character = rtas_token("display-character");
 126                 set_indicator = rtas_token("set-indicator");
 127         }
 128
 129         if (display_character == RTAS_UNKNOWN_SERVICE) {
 130                 /* use hex display if available */
 131                 if (set_indicator != RTAS_UNKNOWN_SERVICE)
 132                         rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
 133                 return;
 134         }
 135
 136         spin_lock(&progress_lock);
 137
 138         /*
 139          * Last write ended with newline, but we didn't print it since
 140          * it would just clear the bottom line of output. Print it now
 141          * instead.
 142          *
 143          * If no newline is pending and form feed is supported, clear the
 144          * display with a form feed; otherwise, print a CR to start output
 145          * at the beginning of the line.
 146          */
 147         if (pending_newline) {
 148                 rtas_call(display_character, 1, 1, NULL, '\r');
 149                 rtas_call(display_character, 1, 1, NULL, '\n');
 150                 pending_newline = 0;
 151         } else {
 152                 current_line = 0;
 153                 if (form_feed)
 154                         rtas_call(display_character, 1, 1, NULL,
 155                                   (char)form_feed);
 156                 else
 157                         rtas_call(display_character, 1, 1, NULL, '\r');
 158         }
 159
 160         if (row_width)
 161                 width = row_width[current_line];
 162         else
 163                 width = display_width;
 164         os = s;
 165         while (*os) {
 166                 if (*os == '\n' || *os == '\r') {
 167                         /* If newline is the last character, save it
 168                          * until next call to avoid bumping up the
 169                          * display output.
 170                          */
 171                         if (*os == '\n' && !os[1]) {
 172                                 pending_newline = 1;
 173                                 current_line++;
 174                                 if (current_line > display_lines-1)
 175                                         current_line = display_lines-1;
 176                                 spin_unlock(&progress_lock);
 177                                 return;
 178                         }
 179
 180                         /* RTAS wants CR-LF, not just LF */
 181
 182                         if (*os == '\n') {
 183                                 rtas_call(display_character, 1, 1, NULL, '\r');
 184                                 rtas_call(display_character, 1, 1, NULL, '\n');
 185                         } else {
 186                                 /* CR might be used to re-draw a line, so we'll
 187                                  * leave it alone and not add LF.
 188                                  */
 189                                 rtas_call(display_character, 1, 1, NULL, *os);
 190                         }
 191
 192                         if (row_width)
 193                                 width = row_width[current_line];
 194                         else
 195                                 width = display_width;
 196                 } else {
 197                         width--;
 198                         rtas_call(display_character, 1, 1, NULL, *os);
 199                 }
 200
 201                 os++;
 202
 203                 /* if we overwrite the screen length */
 204                 if (width <= 0)
 205                         while ((*os != 0) && (*os != '\n') && (*os != '\r'))
 206                                 os++;
 207         }
 208
 209         spin_unlock(&progress_lock);
 210 }
 211
 212 int
 213 rtas_token(const char *service)
 214 {
 215         int *tokp;
 216         if (rtas.dev == NULL) {
 217                 PPCDBG(PPCDBG_RTAS,"\tNo rtas device in device-tree...\n");
 218                 return RTAS_UNKNOWN_SERVICE;
 219         }
 220         tokp = (int *) get_property(rtas.dev, service, NULL);
 221         return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
 222 }
 223
 224 /*
 225  * Return the firmware-specified size of the error log buffer
 226  *  for all rtas calls that require an error buffer argument.
 227  *  This includes 'check-exception' and 'rtas-last-error'.
 228  */
 229 int rtas_get_error_log_max(void)
 230 {
 231         static int rtas_error_log_max;
 232         if (rtas_error_log_max)
 233                 return rtas_error_log_max;
 234
 235         rtas_error_log_max = rtas_token ("rtas-error-log-max");
 236         if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
 237             (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
 238                 printk (KERN_WARNING "RTAS: bad log buffer size %d\n", rtas_error_log_max);
 239                 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
 240         }
 241         return rtas_error_log_max;
 242 }
 243
 244
 245 /** Return a copy of the detailed error text associated with the
 246  *  most recent failed call to rtas.  Because the error text
 247  *  might go stale if there are any other intervening rtas calls,
 248  *  this routine must be called atomically with whatever produced
 249  *  the error (i.e. with rtas.lock still held from the previous call).
 250  */
 251 static int
 252 __fetch_rtas_last_error(void)
 253 {
 254         struct rtas_args err_args, save_args;
 255         u32 bufsz;
 256
 257         bufsz = rtas_get_error_log_max();
 258
 259         err_args.token = rtas_token("rtas-last-error");
 260         err_args.nargs = 2;
 261         err_args.nret = 1;
 262
 263         err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
 264         err_args.args[1] = bufsz;
 265         err_args.args[2] = 0;
 266
 267         save_args = rtas.args;
 268         rtas.args = err_args;
 269
 270         enter_rtas(__pa(&rtas.args));
 271
 272         err_args = rtas.args;
 273         rtas.args = save_args;
 274
 275         return err_args.args[2];
 276 }
 277
 278 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
 279 {
 280         va_list list;
 281         int i, logit = 0;
 282         unsigned long s;
 283         struct rtas_args *rtas_args;
 284         char * buff_copy = NULL;
 285         int ret;
 286
 287         PPCDBG(PPCDBG_RTAS, "Entering rtas_call\n");
 288         PPCDBG(PPCDBG_RTAS, "\ttoken    = 0x%x\n", token);
 289         PPCDBG(PPCDBG_RTAS, "\tnargs    = %d\n", nargs);
 290         PPCDBG(PPCDBG_RTAS, "\tnret     = %d\n", nret);
 291         PPCDBG(PPCDBG_RTAS, "\t&outputs = 0x%lx\n", outputs);
 292         if (token == RTAS_UNKNOWN_SERVICE)
 293                 return -1;
 294
 295         /* Gotta do something different here, use global lock for now... */
 296         spin_lock_irqsave(&rtas.lock, s);
 297         rtas_args = &rtas.args;
 298
 299         rtas_args->token = token;
 300         rtas_args->nargs = nargs;
 301         rtas_args->nret  = nret;
 302         rtas_args->rets  = (rtas_arg_t *)&(rtas_args->args[nargs]);
 303         va_start(list, outputs);
 304         for (i = 0; i < nargs; ++i) {
 305                 rtas_args->args[i] = va_arg(list, rtas_arg_t);
 306                 PPCDBG(PPCDBG_RTAS, "\tnarg[%d] = 0x%x\n", i, rtas_args->args[i]);
 307         }
 308         va_end(list);
 309
 310         for (i = 0; i < nret; ++i)
 311                 rtas_args->rets[i] = 0;
 312
 313         PPCDBG(PPCDBG_RTAS, "\tentering rtas with 0x%lx\n",
 314                 __pa(rtas_args));
 315         enter_rtas(__pa(rtas_args));
 316         PPCDBG(PPCDBG_RTAS, "\treturned from rtas ...\n");
 317
 318         /* A -1 return code indicates that the last command couldn't
 319            be completed due to a hardware error. */
 320         if (rtas_args->rets[0] == -1)
 321                 logit = (__fetch_rtas_last_error() == 0);
 322
 323         ifppcdebug(PPCDBG_RTAS) {
 324                 for(i=0; i < nret ;i++)
 325                         udbg_printf("\tnret[%d] = 0x%lx\n", i, (ulong)rtas_args->rets[i]);
 326         }
 327
 328         if (nret > 1 && outputs != NULL)
 329                 for (i = 0; i < nret-1; ++i)
 330                         outputs[i] = rtas_args->rets[i+1];
 331         ret = (nret > 0)? rtas_args->rets[0]: 0;
 332
 333         /* Log the error in the unlikely case that there was one. */
 334         if (unlikely(logit)) {
 335                 buff_copy = rtas_err_buf;
 336                 if (mem_init_done) {
 337                         buff_copy = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
 338                         if (buff_copy)
 339                                 memcpy(buff_copy, rtas_err_buf,
 340                                        RTAS_ERROR_LOG_MAX);
 341                 }
 342         }
 343
 344         /* Gotta do something different here, use global lock for now... */
 345         spin_unlock_irqrestore(&rtas.lock, s);
 346
 347         if (buff_copy) {
 348                 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
 349                 if (mem_init_done)
 350                         kfree(buff_copy);
 351         }
 352         return ret;
 353 }
 354
 355 /* Given an RTAS status code of 990n compute the hinted delay of 10^n
 356  * (last digit) milliseconds.  For now we bound at n=5 (100 sec).
 357  */
 358 unsigned int
 359 rtas_extended_busy_delay_time(int status)
 360 {
 361         int order = status - 9900;
 362         unsigned long ms;
 363
 364         if (order < 0)
 365                 order = 0;      /* RTC depends on this for -2 clock busy */
 366         else if (order > 5)
 367                 order = 5;      /* bound */
 368
 369         /* Use microseconds for reasonable accuracy */
 370         for (ms=1; order > 0; order--)
 371                 ms *= 10;
 372
 373         return ms;
 374 }
 375
 376 int rtas_error_rc(int rtas_rc)
 377 {
 378         int rc;
 379
 380         switch (rtas_rc) {
 381                 case -1:                /* Hardware Error */
 382                         rc = -EIO;
 383                         break;
 384                 case -3:                /* Bad indicator/domain/etc */
 385                         rc = -EINVAL;
 386                         break;
 387                 case -9000:             /* Isolation error */
 388                         rc = -EFAULT;
 389                         break;
 390                 case -9001:             /* Outstanding TCE/PTE */
 391                         rc = -EEXIST;
 392                         break;
 393                 case -9002:             /* No usable slot */
 394                         rc = -ENODEV;
 395                         break;
 396                 default:
 397                         printk(KERN_ERR "%s: unexpected RTAS error %d\n",
 398                                         __FUNCTION__, rtas_rc);
 399                         rc = -ERANGE;
 400                         break;
 401         }
 402         return rc;
 403 }
 404
 405 int rtas_get_power_level(int powerdomain, int *level)
 406 {
 407         int token = rtas_token("get-power-level");
 408         int rc;
 409
 410         if (token == RTAS_UNKNOWN_SERVICE)
 411                 return -ENOENT;
 412
 413         while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
 414                 udelay(1);
 415
 416         if (rc < 0)
 417                 return rtas_error_rc(rc);
 418         return rc;
 419 }
 420
 421 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
 422 {
 423         int token = rtas_token("set-power-level");
 424         unsigned int wait_time;
 425         int rc;
 426
 427         if (token == RTAS_UNKNOWN_SERVICE)
 428                 return -ENOENT;
 429
 430         while (1) {
 431                 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
 432                 if (rc == RTAS_BUSY)
 433                         udelay(1);
 434                 else if (rtas_is_extended_busy(rc)) {
 435                         wait_time = rtas_extended_busy_delay_time(rc);
 436                         udelay(wait_time * 1000);
 437                 } else
 438                         break;
 439         }
 440
 441         if (rc < 0)
 442                 return rtas_error_rc(rc);
 443         return rc;
 444 }
 445
 446 int rtas_get_sensor(int sensor, int index, int *state)
 447 {
 448         int token = rtas_token("get-sensor-state");
 449         unsigned int wait_time;
 450         int rc;
 451
 452         if (token == RTAS_UNKNOWN_SERVICE)
 453                 return -ENOENT;
 454
 455         while (1) {
 456                 rc = rtas_call(token, 2, 2, state, sensor, index);
 457                 if (rc == RTAS_BUSY)
 458                         udelay(1);
 459                 else if (rtas_is_extended_busy(rc)) {
 460                         wait_time = rtas_extended_busy_delay_time(rc);
 461                         udelay(wait_time * 1000);
 462                 } else
 463                         break;
 464         }
 465
 466         if (rc < 0)
 467                 return rtas_error_rc(rc);
 468         return rc;
 469 }
 470
 471 int rtas_set_indicator(int indicator, int index, int new_value)
 472 {
 473         int token = rtas_token("set-indicator");
 474         unsigned int wait_time;
 475         int rc;
 476
 477         if (token == RTAS_UNKNOWN_SERVICE)
 478                 return -ENOENT;
 479
 480         while (1) {
 481                 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
 482                 if (rc == RTAS_BUSY)
 483                         udelay(1);
 484                 else if (rtas_is_extended_busy(rc)) {
 485                         wait_time = rtas_extended_busy_delay_time(rc);
 486                         udelay(wait_time * 1000);
 487                 }
 488                 else
 489                         break;
 490         }
 491
 492         if (rc < 0)
 493                 return rtas_error_rc(rc);
 494         return rc;
 495 }
 496
 497 #define FLASH_BLOCK_LIST_VERSION (1UL)
 498 static void
 499 rtas_flash_firmware(void)
 500 {
 501         unsigned long image_size;
 502         struct flash_block_list *f, *next, *flist;
 503         unsigned long rtas_block_list;
 504         int i, status, update_token;
 505
 506         update_token = rtas_token("ibm,update-flash-64-and-reboot");
 507         if (update_token == RTAS_UNKNOWN_SERVICE) {
 508                 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot is not available -- not a service partition?\n");
 509                 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
 510                 return;
 511         }
 512
 513         /* NOTE: the "first" block list is a global var with no data
 514          * blocks in the kernel data segment.  We do this because
 515          * we want to ensure this block_list addr is under 4GB.
 516          */
 517         rtas_firmware_flash_list.num_blocks = 0;
 518         flist = (struct flash_block_list *)&rtas_firmware_flash_list;
 519         rtas_block_list = virt_to_abs(flist);
 520         if (rtas_block_list >= 4UL*1024*1024*1024) {
 521                 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
 522                 return;
 523         }
 524
 525         printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
 526         /* Update the block_list in place. */
 527         image_size = 0;
 528         for (f = flist; f; f = next) {
 529                 /* Translate data addrs to absolute */
 530                 for (i = 0; i < f->num_blocks; i++) {
 531                         f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
 532                         image_size += f->blocks[i].length;
 533                 }
 534                 next = f->next;
 535                 /* Don't translate NULL pointer for last entry */
 536                 if (f->next)
 537                         f->next = (struct flash_block_list *)virt_to_abs(f->next);
 538                 else
 539                         f->next = NULL;
 540                 /* make num_blocks into the version/length field */
 541                 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
 542         }
 543
 544         printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
 545         printk(KERN_ALERT "FLASH: performing flash and reboot\n");
 546         rtas_progress("Flashing        \n", 0x0);
 547         rtas_progress("Please Wait...  ", 0x0);
 548         printk(KERN_ALERT "FLASH: this will take several minutes.  Do not power off!\n");
 549         status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
 550         switch (status) {       /* should only get "bad" status */
 551             case 0:
 552                 printk(KERN_ALERT "FLASH: success\n");
 553                 break;
 554             case -1:
 555                 printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
 556                 break;
 557             case -3:
 558                 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
 559                 break;
 560             case -4:
 561                 printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
 562                 break;
 563             default:
 564                 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
 565                 break;
 566         }
 567 }
 568
 569 void rtas_flash_bypass_warning(void)
 570 {
 571         printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
 572         printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
 573 }
 574
 575
 576 void
 577 rtas_restart(char *cmd)
 578 {
 579         if (rtas_firmware_flash_list.next)
 580                 rtas_flash_firmware();
 581
 582         printk("RTAS system-reboot returned %d\n",
 583                rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
 584         for (;;);
 585 }
 586
 587 void
 588 rtas_power_off(void)
 589 {
 590         if (rtas_firmware_flash_list.next)
 591                 rtas_flash_bypass_warning();
 592         /* allow power on only with power button press */
 593         printk("RTAS power-off returned %d\n",
 594                rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
 595         for (;;);
 596 }
 597
 598 void
 599 rtas_halt(void)
 600 {
 601         if (rtas_firmware_flash_list.next)
 602                 rtas_flash_bypass_warning();
 603         rtas_power_off();
 604 }
 605
 606 /* Must be in the RMO region, so we place it here */
 607 static char rtas_os_term_buf[2048];
 608
 609 void rtas_os_term(char *str)
 610 {
 611         int status;
 612
 613         if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term"))
 614                 return;
 615
 616         snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
 617
 618         do {
 619                 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
 620                                    __pa(rtas_os_term_buf));
 621
 622                 if (status == RTAS_BUSY)
 623                         udelay(1);
 624                 else if (status != 0)
 625                         printk(KERN_EMERG "ibm,os-term call failed %d\n",
 626                                status);
 627         } while (status == RTAS_BUSY);
 628 }
 629
 630
 631 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
 632 {
 633         struct rtas_args args;
 634         unsigned long flags;
 635         char * buff_copy;
 636         int nargs;
 637         int err_rc = 0;
 638
 639         if (!capable(CAP_SYS_ADMIN))
 640                 return -EPERM;
 641
 642         if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
 643                 return -EFAULT;
 644
 645         nargs = args.nargs;
 646         if (nargs > ARRAY_SIZE(args.args)
 647             || args.nret > ARRAY_SIZE(args.args)
 648             || nargs + args.nret > ARRAY_SIZE(args.args))
 649                 return -EINVAL;
 650
 651         /* Copy in args. */
 652         if (copy_from_user(args.args, uargs->args,
 653                            nargs * sizeof(rtas_arg_t)) != 0)
 654                 return -EFAULT;
 655
 656         buff_copy = kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL);
 657
 658         spin_lock_irqsave(&rtas.lock, flags);
 659
 660         rtas.args = args;
 661         enter_rtas(__pa(&rtas.args));
 662         args = rtas.args;
 663
 664         args.rets = &args.args[nargs];
 665
 666         /* A -1 return code indicates that the last command couldn't
 667            be completed due to a hardware error. */
 668         if (args.rets[0] == -1) {
 669                 err_rc = __fetch_rtas_last_error();
 670                 if ((err_rc == 0) && buff_copy) {
 671                         memcpy(buff_copy, rtas_err_buf, RTAS_ERROR_LOG_MAX);
 672                 }
 673         }
 674
 675         spin_unlock_irqrestore(&rtas.lock, flags);
 676
 677         if (buff_copy) {
 678                 if ((args.rets[0] == -1) && (err_rc == 0)) {
 679                         log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
 680                 }
 681                 kfree(buff_copy);
 682         }
 683
 684         /* Copy out args. */
 685         if (copy_to_user(uargs->args + nargs,
 686                          args.args + nargs,
 687                          args.nret * sizeof(rtas_arg_t)) != 0)
 688                 return -EFAULT;
 689
 690         return 0;
 691 }
 692
 693 /* This version can't take the spinlock, because it never returns */
 694
 695 struct rtas_args rtas_stop_self_args = {
 696         /* The token is initialized for real in setup_system() */
 697         .token = RTAS_UNKNOWN_SERVICE,
 698         .nargs = 0,
 699         .nret = 1,
 700         .rets = &rtas_stop_self_args.args[0],
 701 };
 702
 703 void rtas_stop_self(void)
 704 {
 705         struct rtas_args *rtas_args = &rtas_stop_self_args;
 706
 707         local_irq_disable();
 708
 709         BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE);
 710
 711         printk("cpu %u (hwid %u) Ready to die...\n",
 712                smp_processor_id(), hard_smp_processor_id());
 713         enter_rtas(__pa(rtas_args));
 714
 715         panic("Alas, I survived.\n");
 716 }
 717
 718 /*
 719  * Call early during boot, before mem init or bootmem, to retreive the RTAS
 720  * informations from the device-tree and allocate the RMO buffer for userland
 721  * accesses.
 722  */
 723 void __init rtas_initialize(void)
 724 {
 725         /* Get RTAS dev node and fill up our "rtas" structure with infos
 726          * about it.
 727          */
 728         rtas.dev = of_find_node_by_name(NULL, "rtas");
 729         if (rtas.dev) {
 730                 u32 *basep, *entryp;
 731                 u32 *sizep;
 732
 733                 basep = (u32 *)get_property(rtas.dev, "linux,rtas-base", NULL);
 734                 sizep = (u32 *)get_property(rtas.dev, "rtas-size", NULL);
 735                 if (basep != NULL && sizep != NULL) {
 736                         rtas.base = *basep;
 737                         rtas.size = *sizep;
 738                         entryp = (u32 *)get_property(rtas.dev, "linux,rtas-entry", NULL);
 739                         if (entryp == NULL) /* Ugh */
 740                                 rtas.entry = rtas.base;
 741                         else
 742                                 rtas.entry = *entryp;
 743                 } else
 744                         rtas.dev = NULL;
 745         }
 746         /* If RTAS was found, allocate the RMO buffer for it and look for
 747          * the stop-self token if any
 748          */
 749         if (rtas.dev) {
 750                 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
 751                 if (systemcfg->platform == PLATFORM_PSERIES_LPAR)
 752                         rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);
 753
 754                 rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE,
 755                                                         rtas_region);
 756
 757 #ifdef CONFIG_HOTPLUG_CPU
 758                 rtas_stop_self_args.token = rtas_token("stop-self");
 759 #endif /* CONFIG_HOTPLUG_CPU */
 760         }
 761
 762 }
 763
 764
 765 EXPORT_SYMBOL(rtas_firmware_flash_list);
 766 EXPORT_SYMBOL(rtas_token);
 767 EXPORT_SYMBOL(rtas_call);
 768 EXPORT_SYMBOL(rtas_data_buf);
 769 EXPORT_SYMBOL(rtas_data_buf_lock);
 770 EXPORT_SYMBOL(rtas_extended_busy_delay_time);
 771 EXPORT_SYMBOL(rtas_get_sensor);
 772 EXPORT_SYMBOL(rtas_get_power_level);
 773 EXPORT_SYMBOL(rtas_set_power_level);
 774 EXPORT_SYMBOL(rtas_set_indicator);
 775 EXPORT_SYMBOL(rtas_get_error_log_max);