arch/powerpc/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 #include <linux/delay.h>
  21
  22 #include <asm/prom.h>
  23 #include <asm/rtas.h>
  24 #include <asm/semaphore.h>
  25 #include <asm/machdep.h>
  26 #include <asm/page.h>
  27 #include <asm/param.h>
  28 #include <asm/system.h>
  29 #include <asm/delay.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/lmb.h>
  32
  33 struct rtas_t rtas = {
  34         .lock = SPIN_LOCK_UNLOCKED
  35 };
  36
  37 EXPORT_SYMBOL(rtas);
  38
  39 DEFINE_SPINLOCK(rtas_data_buf_lock);
  40 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
  41 unsigned long rtas_rmo_buf;
  42
  43 /*
  44  * If non-NULL, this gets called when the kernel terminates.
  45  * This is done like this so rtas_flash can be a module.
  46  */
  47 void (*rtas_flash_term_hook)(int);
  48 EXPORT_SYMBOL(rtas_flash_term_hook);
  49
  50 /*
  51  * call_rtas_display_status and call_rtas_display_status_delay
  52  * are designed only for very early low-level debugging, which
  53  * is why the token is hard-coded to 10.
  54  */
  55 void call_rtas_display_status(unsigned char c)
  56 {
  57         struct rtas_args *args = &rtas.args;
  58         unsigned long s;
  59
  60         if (!rtas.base)
  61                 return;
  62         spin_lock_irqsave(&rtas.lock, s);
  63
  64         args->token = 10;
  65         args->nargs = 1;
  66         args->nret  = 1;
  67         args->rets  = (rtas_arg_t *)&(args->args[1]);
  68         args->args[0] = (int)c;
  69
  70         enter_rtas(__pa(args));
  71
  72         spin_unlock_irqrestore(&rtas.lock, s);
  73 }
  74
  75 void call_rtas_display_status_delay(unsigned char c)
  76 {
  77         static int pending_newline = 0;  /* did last write end with unprinted newline? */
  78         static int width = 16;
  79
  80         if (c == '\n') {
  81                 while (width-- > 0)
  82                         call_rtas_display_status(' ');
  83                 width = 16;
  84                 mdelay(500);
  85                 pending_newline = 1;
  86         } else {
  87                 if (pending_newline) {
  88                         call_rtas_display_status('\r');
  89                         call_rtas_display_status('\n');
  90                 }
  91                 pending_newline = 0;
  92                 if (width--) {
  93                         call_rtas_display_status(c);
  94                         udelay(10000);
  95                 }
  96         }
  97 }
  98
  99 void rtas_progress(char *s, unsigned short hex)
 100 {
 101         struct device_node *root;
 102         int width, *p;
 103         char *os;
 104         static int display_character, set_indicator;
 105         static int display_width, display_lines, *row_width, form_feed;
 106         static DEFINE_SPINLOCK(progress_lock);
 107         static int current_line;
 108         static int pending_newline = 0;  /* did last write end with unprinted newline? */
 109
 110         if (!rtas.base)
 111                 return;
 112
 113         if (display_width == 0) {
 114                 display_width = 0x10;
 115                 if ((root = find_path_device("/rtas"))) {
 116                         if ((p = (unsigned int *)get_property(root,
 117                                         "ibm,display-line-length", NULL)))
 118                                 display_width = *p;
 119                         if ((p = (unsigned int *)get_property(root,
 120                                         "ibm,form-feed", NULL)))
 121                                 form_feed = *p;
 122                         if ((p = (unsigned int *)get_property(root,
 123                                         "ibm,display-number-of-lines", NULL)))
 124                                 display_lines = *p;
 125                         row_width = (unsigned int *)get_property(root,
 126                                         "ibm,display-truncation-length", NULL);
 127                 }
 128                 display_character = rtas_token("display-character");
 129                 set_indicator = rtas_token("set-indicator");
 130         }
 131
 132         if (display_character == RTAS_UNKNOWN_SERVICE) {
 133                 /* use hex display if available */
 134                 if (set_indicator != RTAS_UNKNOWN_SERVICE)
 135                         rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
 136                 return;
 137         }
 138
 139         spin_lock(&progress_lock);
 140
 141         /*
 142          * Last write ended with newline, but we didn't print it since
 143          * it would just clear the bottom line of output. Print it now
 144          * instead.
 145          *
 146          * If no newline is pending and form feed is supported, clear the
 147          * display with a form feed; otherwise, print a CR to start output
 148          * at the beginning of the line.
 149          */
 150         if (pending_newline) {
 151                 rtas_call(display_character, 1, 1, NULL, '\r');
 152                 rtas_call(display_character, 1, 1, NULL, '\n');
 153                 pending_newline = 0;
 154         } else {
 155                 current_line = 0;
 156                 if (form_feed)
 157                         rtas_call(display_character, 1, 1, NULL,
 158                                   (char)form_feed);
 159                 else
 160                         rtas_call(display_character, 1, 1, NULL, '\r');
 161         }
 162
 163         if (row_width)
 164                 width = row_width[current_line];
 165         else
 166                 width = display_width;
 167         os = s;
 168         while (*os) {
 169                 if (*os == '\n' || *os == '\r') {
 170                         /* If newline is the last character, save it
 171                          * until next call to avoid bumping up the
 172                          * display output.
 173                          */
 174                         if (*os == '\n' && !os[1]) {
 175                                 pending_newline = 1;
 176                                 current_line++;
 177                                 if (current_line > display_lines-1)
 178                                         current_line = display_lines-1;
 179                                 spin_unlock(&progress_lock);
 180                                 return;
 181                         }
 182
 183                         /* RTAS wants CR-LF, not just LF */
 184
 185                         if (*os == '\n') {
 186                                 rtas_call(display_character, 1, 1, NULL, '\r');
 187                                 rtas_call(display_character, 1, 1, NULL, '\n');
 188                         } else {
 189                                 /* CR might be used to re-draw a line, so we'll
 190                                  * leave it alone and not add LF.
 191                                  */
 192                                 rtas_call(display_character, 1, 1, NULL, *os);
 193                         }
 194
 195                         if (row_width)
 196                                 width = row_width[current_line];
 197                         else
 198                                 width = display_width;
 199                 } else {
 200                         width--;
 201                         rtas_call(display_character, 1, 1, NULL, *os);
 202                 }
 203
 204                 os++;
 205
 206                 /* if we overwrite the screen length */
 207                 if (width <= 0)
 208                         while ((*os != 0) && (*os != '\n') && (*os != '\r'))
 209                                 os++;
 210         }
 211
 212         spin_unlock(&progress_lock);
 213 }
 214 EXPORT_SYMBOL(rtas_progress);           /* needed by rtas_flash module */
 215
 216 int rtas_token(const char *service)
 217 {
 218         int *tokp;
 219         if (rtas.dev == NULL)
 220                 return RTAS_UNKNOWN_SERVICE;
 221         tokp = (int *) get_property(rtas.dev, service, NULL);
 222         return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
 223 }
 224
 225 #ifdef CONFIG_RTAS_ERROR_LOGGING
 226 /*
 227  * Return the firmware-specified size of the error log buffer
 228  *  for all rtas calls that require an error buffer argument.
 229  *  This includes 'check-exception' and 'rtas-last-error'.
 230  */
 231 int rtas_get_error_log_max(void)
 232 {
 233         static int rtas_error_log_max;
 234         if (rtas_error_log_max)
 235                 return rtas_error_log_max;
 236
 237         rtas_error_log_max = rtas_token ("rtas-error-log-max");
 238         if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
 239             (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
 240                 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
 241                         rtas_error_log_max);
 242                 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
 243         }
 244         return rtas_error_log_max;
 245 }
 246 EXPORT_SYMBOL(rtas_get_error_log_max);
 247
 248
 249 char rtas_err_buf[RTAS_ERROR_LOG_MAX];
 250 int rtas_last_error_token;
 251
 252 /** Return a copy of the detailed error text associated with the
 253  *  most recent failed call to rtas.  Because the error text
 254  *  might go stale if there are any other intervening rtas calls,
 255  *  this routine must be called atomically with whatever produced
 256  *  the error (i.e. with rtas.lock still held from the previous call).
 257  */
 258 static char *__fetch_rtas_last_error(char *altbuf)
 259 {
 260         struct rtas_args err_args, save_args;
 261         u32 bufsz;
 262         char *buf = NULL;
 263
 264         if (rtas_last_error_token == -1)
 265                 return NULL;
 266
 267         bufsz = rtas_get_error_log_max();
 268
 269         err_args.token = rtas_last_error_token;
 270         err_args.nargs = 2;
 271         err_args.nret = 1;
 272         err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
 273         err_args.args[1] = bufsz;
 274         err_args.args[2] = 0;
 275
 276         save_args = rtas.args;
 277         rtas.args = err_args;
 278
 279         enter_rtas(__pa(&rtas.args));
 280
 281         err_args = rtas.args;
 282         rtas.args = save_args;
 283
 284         /* Log the error in the unlikely case that there was one. */
 285         if (unlikely(err_args.args[2] == 0)) {
 286                 if (altbuf) {
 287                         buf = altbuf;
 288                 } else {
 289                         buf = rtas_err_buf;
 290                         if (mem_init_done)
 291                                 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
 292                 }
 293                 if (buf)
 294                         memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
 295         }
 296
 297         return buf;
 298 }
 299
 300 #define get_errorlog_buffer()   kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
 301
 302 #else /* CONFIG_RTAS_ERROR_LOGGING */
 303 #define __fetch_rtas_last_error(x)      NULL
 304 #define get_errorlog_buffer()           NULL
 305 #endif
 306
 307 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
 308 {
 309         va_list list;
 310         int i;
 311         unsigned long s;
 312         struct rtas_args *rtas_args;
 313         char *buff_copy = NULL;
 314         int ret;
 315
 316         if (token == RTAS_UNKNOWN_SERVICE)
 317                 return -1;
 318
 319         /* Gotta do something different here, use global lock for now... */
 320         spin_lock_irqsave(&rtas.lock, s);
 321         rtas_args = &rtas.args;
 322
 323         rtas_args->token = token;
 324         rtas_args->nargs = nargs;
 325         rtas_args->nret  = nret;
 326         rtas_args->rets  = (rtas_arg_t *)&(rtas_args->args[nargs]);
 327         va_start(list, outputs);
 328         for (i = 0; i < nargs; ++i)
 329                 rtas_args->args[i] = va_arg(list, rtas_arg_t);
 330         va_end(list);
 331
 332         for (i = 0; i < nret; ++i)
 333                 rtas_args->rets[i] = 0;
 334
 335         enter_rtas(__pa(rtas_args));
 336
 337         /* A -1 return code indicates that the last command couldn't
 338            be completed due to a hardware error. */
 339         if (rtas_args->rets[0] == -1)
 340                 buff_copy = __fetch_rtas_last_error(NULL);
 341
 342         if (nret > 1 && outputs != NULL)
 343                 for (i = 0; i < nret-1; ++i)
 344                         outputs[i] = rtas_args->rets[i+1];
 345         ret = (nret > 0)? rtas_args->rets[0]: 0;
 346
 347         /* Gotta do something different here, use global lock for now... */
 348         spin_unlock_irqrestore(&rtas.lock, s);
 349
 350         if (buff_copy) {
 351                 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
 352                 if (mem_init_done)
 353                         kfree(buff_copy);
 354         }
 355         return ret;
 356 }
 357
 358 /* Given an RTAS status code of 990n compute the hinted delay of 10^n
 359  * (last digit) milliseconds.  For now we bound at n=5 (100 sec).
 360  */
 361 unsigned int rtas_extended_busy_delay_time(int status)
 362 {
 363         int order = status - 9900;
 364         unsigned long ms;
 365
 366         if (order < 0)
 367                 order = 0;      /* RTC depends on this for -2 clock busy */
 368         else if (order > 5)
 369                 order = 5;      /* bound */
 370
 371         /* Use microseconds for reasonable accuracy */
 372         for (ms = 1; order > 0; order--)
 373                 ms *= 10;
 374
 375         return ms;
 376 }
 377
 378 int rtas_error_rc(int rtas_rc)
 379 {
 380         int rc;
 381
 382         switch (rtas_rc) {
 383                 case -1:                /* Hardware Error */
 384                         rc = -EIO;
 385                         break;
 386                 case -3:                /* Bad indicator/domain/etc */
 387                         rc = -EINVAL;
 388                         break;
 389                 case -9000:             /* Isolation error */
 390                         rc = -EFAULT;
 391                         break;
 392                 case -9001:             /* Outstanding TCE/PTE */
 393                         rc = -EEXIST;
 394                         break;
 395                 case -9002:             /* No usable slot */
 396                         rc = -ENODEV;
 397                         break;
 398                 default:
 399                         printk(KERN_ERR "%s: unexpected RTAS error %d\n",
 400                                         __FUNCTION__, rtas_rc);
 401                         rc = -ERANGE;
 402                         break;
 403         }
 404         return rc;
 405 }
 406
 407 int rtas_get_power_level(int powerdomain, int *level)
 408 {
 409         int token = rtas_token("get-power-level");
 410         int rc;
 411
 412         if (token == RTAS_UNKNOWN_SERVICE)
 413                 return -ENOENT;
 414
 415         while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
 416                 udelay(1);
 417
 418         if (rc < 0)
 419                 return rtas_error_rc(rc);
 420         return rc;
 421 }
 422
 423 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
 424 {
 425         int token = rtas_token("set-power-level");
 426         unsigned int wait_time;
 427         int rc;
 428
 429         if (token == RTAS_UNKNOWN_SERVICE)
 430                 return -ENOENT;
 431
 432         while (1) {
 433                 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
 434                 if (rc == RTAS_BUSY)
 435                         udelay(1);
 436                 else if (rtas_is_extended_busy(rc)) {
 437                         wait_time = rtas_extended_busy_delay_time(rc);
 438                         udelay(wait_time * 1000);
 439                 } else
 440                         break;
 441         }
 442
 443         if (rc < 0)
 444                 return rtas_error_rc(rc);
 445         return rc;
 446 }
 447
 448 int rtas_get_sensor(int sensor, int index, int *state)
 449 {
 450         int token = rtas_token("get-sensor-state");
 451         unsigned int wait_time;
 452         int rc;
 453
 454         if (token == RTAS_UNKNOWN_SERVICE)
 455                 return -ENOENT;
 456
 457         while (1) {
 458                 rc = rtas_call(token, 2, 2, state, sensor, index);
 459                 if (rc == RTAS_BUSY)
 460                         udelay(1);
 461                 else if (rtas_is_extended_busy(rc)) {
 462                         wait_time = rtas_extended_busy_delay_time(rc);
 463                         udelay(wait_time * 1000);
 464                 } else
 465                         break;
 466         }
 467
 468         if (rc < 0)
 469                 return rtas_error_rc(rc);
 470         return rc;
 471 }
 472
 473 int rtas_set_indicator(int indicator, int index, int new_value)
 474 {
 475         int token = rtas_token("set-indicator");
 476         unsigned int wait_time;
 477         int rc;
 478
 479         if (token == RTAS_UNKNOWN_SERVICE)
 480                 return -ENOENT;
 481
 482         while (1) {
 483                 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
 484                 if (rc == RTAS_BUSY)
 485                         udelay(1);
 486                 else if (rtas_is_extended_busy(rc)) {
 487                         wait_time = rtas_extended_busy_delay_time(rc);
 488                         udelay(wait_time * 1000);
 489                 }
 490                 else
 491                         break;
 492         }
 493
 494         if (rc < 0)
 495                 return rtas_error_rc(rc);
 496         return rc;
 497 }
 498
 499 void rtas_restart(char *cmd)
 500 {
 501         if (rtas_flash_term_hook)
 502                 rtas_flash_term_hook(SYS_RESTART);
 503         printk("RTAS system-reboot returned %d\n",
 504                rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
 505         for (;;);
 506 }
 507
 508 void rtas_power_off(void)
 509 {
 510         if (rtas_flash_term_hook)
 511                 rtas_flash_term_hook(SYS_POWER_OFF);
 512         /* allow power on only with power button press */
 513         printk("RTAS power-off returned %d\n",
 514                rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
 515         for (;;);
 516 }
 517
 518 void rtas_halt(void)
 519 {
 520         if (rtas_flash_term_hook)
 521                 rtas_flash_term_hook(SYS_HALT);
 522         /* allow power on only with power button press */
 523         printk("RTAS power-off returned %d\n",
 524                rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
 525         for (;;);
 526 }
 527
 528 /* Must be in the RMO region, so we place it here */
 529 static char rtas_os_term_buf[2048];
 530
 531 void rtas_os_term(char *str)
 532 {
 533         int status;
 534
 535         if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term"))
 536                 return;
 537
 538         snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
 539
 540         do {
 541                 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
 542                                    __pa(rtas_os_term_buf));
 543
 544                 if (status == RTAS_BUSY)
 545                         udelay(1);
 546                 else if (status != 0)
 547                         printk(KERN_EMERG "ibm,os-term call failed %d\n",
 548                                status);
 549         } while (status == RTAS_BUSY);
 550 }
 551
 552
 553 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
 554 {
 555         struct rtas_args args;
 556         unsigned long flags;
 557         char *buff_copy, *errbuf = NULL;
 558         int nargs;
 559
 560         if (!capable(CAP_SYS_ADMIN))
 561                 return -EPERM;
 562
 563         if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
 564                 return -EFAULT;
 565
 566         nargs = args.nargs;
 567         if (nargs > ARRAY_SIZE(args.args)
 568             || args.nret > ARRAY_SIZE(args.args)
 569             || nargs + args.nret > ARRAY_SIZE(args.args))
 570                 return -EINVAL;
 571
 572         /* Copy in args. */
 573         if (copy_from_user(args.args, uargs->args,
 574                            nargs * sizeof(rtas_arg_t)) != 0)
 575                 return -EFAULT;
 576
 577         buff_copy = get_errorlog_buffer();
 578
 579         spin_lock_irqsave(&rtas.lock, flags);
 580
 581         rtas.args = args;
 582         enter_rtas(__pa(&rtas.args));
 583         args = rtas.args;
 584
 585         args.rets = &args.args[nargs];
 586
 587         /* A -1 return code indicates that the last command couldn't
 588            be completed due to a hardware error. */
 589         if (args.rets[0] == -1)
 590                 errbuf = __fetch_rtas_last_error(buff_copy);
 591
 592         spin_unlock_irqrestore(&rtas.lock, flags);
 593
 594         if (buff_copy) {
 595                 if (errbuf)
 596                         log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
 597                 kfree(buff_copy);
 598         }
 599
 600         /* Copy out args. */
 601         if (copy_to_user(uargs->args + nargs,
 602                          args.args + nargs,
 603                          args.nret * sizeof(rtas_arg_t)) != 0)
 604                 return -EFAULT;
 605
 606         return 0;
 607 }
 608
 609 /* This version can't take the spinlock, because it never returns */
 610
 611 struct rtas_args rtas_stop_self_args = {
 612         /* The token is initialized for real in setup_system() */
 613         .token = RTAS_UNKNOWN_SERVICE,
 614         .nargs = 0,
 615         .nret = 1,
 616         .rets = &rtas_stop_self_args.args[0],
 617 };
 618
 619 void rtas_stop_self(void)
 620 {
 621         struct rtas_args *rtas_args = &rtas_stop_self_args;
 622
 623         local_irq_disable();
 624
 625         BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE);
 626
 627         printk("cpu %u (hwid %u) Ready to die...\n",
 628                smp_processor_id(), hard_smp_processor_id());
 629         enter_rtas(__pa(rtas_args));
 630
 631         panic("Alas, I survived.\n");
 632 }
 633
 634 /*
 635  * Call early during boot, before mem init or bootmem, to retreive the RTAS
 636  * informations from the device-tree and allocate the RMO buffer for userland
 637  * accesses.
 638  */
 639 void __init rtas_initialize(void)
 640 {
 641         unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
 642
 643         /* Get RTAS dev node and fill up our "rtas" structure with infos
 644          * about it.
 645          */
 646         rtas.dev = of_find_node_by_name(NULL, "rtas");
 647         if (rtas.dev) {
 648                 u32 *basep, *entryp;
 649                 u32 *sizep;
 650
 651                 basep = (u32 *)get_property(rtas.dev, "linux,rtas-base", NULL);
 652                 sizep = (u32 *)get_property(rtas.dev, "rtas-size", NULL);
 653                 if (basep != NULL && sizep != NULL) {
 654                         rtas.base = *basep;
 655                         rtas.size = *sizep;
 656                         entryp = (u32 *)get_property(rtas.dev, "linux,rtas-entry", NULL);
 657                         if (entryp == NULL) /* Ugh */
 658                                 rtas.entry = rtas.base;
 659                         else
 660                                 rtas.entry = *entryp;
 661                 } else
 662                         rtas.dev = NULL;
 663         }
 664         if (!rtas.dev)
 665                 return;
 666
 667         /* If RTAS was found, allocate the RMO buffer for it and look for
 668          * the stop-self token if any
 669          */
 670 #ifdef CONFIG_PPC64
 671         if (_machine == PLATFORM_PSERIES_LPAR)
 672                 rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);
 673 #endif
 674         rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
 675
 676 #ifdef CONFIG_HOTPLUG_CPU
 677         rtas_stop_self_args.token = rtas_token("stop-self");
 678 #endif /* CONFIG_HOTPLUG_CPU */
 679 #ifdef CONFIG_RTAS_ERROR_LOGGING
 680         rtas_last_error_token = rtas_token("rtas-last-error");
 681 #endif
 682 }
 683
 684
 685 EXPORT_SYMBOL(rtas_token);
 686 EXPORT_SYMBOL(rtas_call);
 687 EXPORT_SYMBOL(rtas_data_buf);
 688 EXPORT_SYMBOL(rtas_data_buf_lock);
 689 EXPORT_SYMBOL(rtas_extended_busy_delay_time);
 690 EXPORT_SYMBOL(rtas_get_sensor);
 691 EXPORT_SYMBOL(rtas_get_power_level);
 692 EXPORT_SYMBOL(rtas_set_power_level);
 693 EXPORT_SYMBOL(rtas_set_indicator);