1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 *
4 * Procedures for interfacing to the RTAS on CHRP machines.
5 *
6 * Peter Bergner, IBM March 2001.
7 * Copyright (C) 2001 IBM.
8 */
9
10 #include <stdarg.h>
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/spinlock.h>
14 #include <linux/export.h>
15 #include <linux/init.h>
16 #include <linux/capability.h>
17 #include <linux/delay.h>
18 #include <linux/cpu.h>
19 #include <linux/sched.h>
20 #include <linux/smp.h>
21 #include <linux/completion.h>
22 #include <linux/cpumask.h>
23 #include <linux/memblock.h>
24 #include <linux/slab.h>
25 #include <linux/reboot.h>
26 #include <linux/syscalls.h>
27
28 #include <asm/prom.h>
29 #include <asm/rtas.h>
30 #include <asm/hvcall.h>
31 #include <asm/machdep.h>
32 #include <asm/firmware.h>
33 #include <asm/page.h>
34 #include <asm/param.h>
35 #include <asm/delay.h>
36 #include <linux/uaccess.h>
37 #include <asm/udbg.h>
38 #include <asm/syscalls.h>
39 #include <asm/smp.h>
40 #include <linux/atomic.h>
41 #include <asm/time.h>
42 #include <asm/mmu.h>
43 #include <asm/topology.h>
44 #include <asm/paca.h>
45
46 /* This is here deliberately so it's only used in this file */
47 void enter_rtas(unsigned long);
48
49 struct rtas_t rtas = {
50 .lock = __ARCH_SPIN_LOCK_UNLOCKED
51 };
52 EXPORT_SYMBOL(rtas);
53
54 DEFINE_SPINLOCK(rtas_data_buf_lock);
55 EXPORT_SYMBOL_GPL(rtas_data_buf_lock);
56
57 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __aligned(SZ_4K);
58 EXPORT_SYMBOL_GPL(rtas_data_buf);
59
60 unsigned long rtas_rmo_buf;
61
62 /*
63 * If non-NULL, this gets called when the kernel terminates.
64 * This is done like this so rtas_flash can be a module.
65 */
66 void (*rtas_flash_term_hook)(int);
67 EXPORT_SYMBOL_GPL(rtas_flash_term_hook);
68
69 /* RTAS use home made raw locking instead of spin_lock_irqsave
70 * because those can be called from within really nasty contexts
71 * such as having the timebase stopped which would lockup with
72 * normal locks and spinlock debugging enabled
73 */
lock_rtas(void)74 static unsigned long lock_rtas(void)
75 {
76 unsigned long flags;
77
78 local_irq_save(flags);
79 preempt_disable();
80 arch_spin_lock(&rtas.lock);
81 return flags;
82 }
83
unlock_rtas(unsigned long flags)84 static void unlock_rtas(unsigned long flags)
85 {
86 arch_spin_unlock(&rtas.lock);
87 local_irq_restore(flags);
88 preempt_enable();
89 }
90
91 /*
92 * call_rtas_display_status and call_rtas_display_status_delay
93 * are designed only for very early low-level debugging, which
94 * is why the token is hard-coded to 10.
95 */
call_rtas_display_status(unsigned char c)96 static void call_rtas_display_status(unsigned char c)
97 {
98 unsigned long s;
99
100 if (!rtas.base)
101 return;
102
103 s = lock_rtas();
104 rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);
105 unlock_rtas(s);
106 }
107
call_rtas_display_status_delay(char c)108 static void call_rtas_display_status_delay(char c)
109 {
110 static int pending_newline = 0; /* did last write end with unprinted newline? */
111 static int width = 16;
112
113 if (c == '\n') {
114 while (width-- > 0)
115 call_rtas_display_status(' ');
116 width = 16;
117 mdelay(500);
118 pending_newline = 1;
119 } else {
120 if (pending_newline) {
121 call_rtas_display_status('\r');
122 call_rtas_display_status('\n');
123 }
124 pending_newline = 0;
125 if (width--) {
126 call_rtas_display_status(c);
127 udelay(10000);
128 }
129 }
130 }
131
udbg_init_rtas_panel(void)132 void __init udbg_init_rtas_panel(void)
133 {
134 udbg_putc = call_rtas_display_status_delay;
135 }
136
137 #ifdef CONFIG_UDBG_RTAS_CONSOLE
138
139 /* If you think you're dying before early_init_dt_scan_rtas() does its
140 * work, you can hard code the token values for your firmware here and
141 * hardcode rtas.base/entry etc.
142 */
143 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
144 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
145
udbg_rtascon_putc(char c)146 static void udbg_rtascon_putc(char c)
147 {
148 int tries;
149
150 if (!rtas.base)
151 return;
152
153 /* Add CRs before LFs */
154 if (c == '\n')
155 udbg_rtascon_putc('\r');
156
157 /* if there is more than one character to be displayed, wait a bit */
158 for (tries = 0; tries < 16; tries++) {
159 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
160 break;
161 udelay(1000);
162 }
163 }
164
udbg_rtascon_getc_poll(void)165 static int udbg_rtascon_getc_poll(void)
166 {
167 int c;
168
169 if (!rtas.base)
170 return -1;
171
172 if (rtas_call(rtas_getchar_token, 0, 2, &c))
173 return -1;
174
175 return c;
176 }
177
udbg_rtascon_getc(void)178 static int udbg_rtascon_getc(void)
179 {
180 int c;
181
182 while ((c = udbg_rtascon_getc_poll()) == -1)
183 ;
184
185 return c;
186 }
187
188
udbg_init_rtas_console(void)189 void __init udbg_init_rtas_console(void)
190 {
191 udbg_putc = udbg_rtascon_putc;
192 udbg_getc = udbg_rtascon_getc;
193 udbg_getc_poll = udbg_rtascon_getc_poll;
194 }
195 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
196
rtas_progress(char * s,unsigned short hex)197 void rtas_progress(char *s, unsigned short hex)
198 {
199 struct device_node *root;
200 int width;
201 const __be32 *p;
202 char *os;
203 static int display_character, set_indicator;
204 static int display_width, display_lines, form_feed;
205 static const int *row_width;
206 static DEFINE_SPINLOCK(progress_lock);
207 static int current_line;
208 static int pending_newline = 0; /* did last write end with unprinted newline? */
209
210 if (!rtas.base)
211 return;
212
213 if (display_width == 0) {
214 display_width = 0x10;
215 if ((root = of_find_node_by_path("/rtas"))) {
216 if ((p = of_get_property(root,
217 "ibm,display-line-length", NULL)))
218 display_width = be32_to_cpu(*p);
219 if ((p = of_get_property(root,
220 "ibm,form-feed", NULL)))
221 form_feed = be32_to_cpu(*p);
222 if ((p = of_get_property(root,
223 "ibm,display-number-of-lines", NULL)))
224 display_lines = be32_to_cpu(*p);
225 row_width = of_get_property(root,
226 "ibm,display-truncation-length", NULL);
227 of_node_put(root);
228 }
229 display_character = rtas_token("display-character");
230 set_indicator = rtas_token("set-indicator");
231 }
232
233 if (display_character == RTAS_UNKNOWN_SERVICE) {
234 /* use hex display if available */
235 if (set_indicator != RTAS_UNKNOWN_SERVICE)
236 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
237 return;
238 }
239
240 spin_lock(&progress_lock);
241
242 /*
243 * Last write ended with newline, but we didn't print it since
244 * it would just clear the bottom line of output. Print it now
245 * instead.
246 *
247 * If no newline is pending and form feed is supported, clear the
248 * display with a form feed; otherwise, print a CR to start output
249 * at the beginning of the line.
250 */
251 if (pending_newline) {
252 rtas_call(display_character, 1, 1, NULL, '\r');
253 rtas_call(display_character, 1, 1, NULL, '\n');
254 pending_newline = 0;
255 } else {
256 current_line = 0;
257 if (form_feed)
258 rtas_call(display_character, 1, 1, NULL,
259 (char)form_feed);
260 else
261 rtas_call(display_character, 1, 1, NULL, '\r');
262 }
263
264 if (row_width)
265 width = row_width[current_line];
266 else
267 width = display_width;
268 os = s;
269 while (*os) {
270 if (*os == '\n' || *os == '\r') {
271 /* If newline is the last character, save it
272 * until next call to avoid bumping up the
273 * display output.
274 */
275 if (*os == '\n' && !os[1]) {
276 pending_newline = 1;
277 current_line++;
278 if (current_line > display_lines-1)
279 current_line = display_lines-1;
280 spin_unlock(&progress_lock);
281 return;
282 }
283
284 /* RTAS wants CR-LF, not just LF */
285
286 if (*os == '\n') {
287 rtas_call(display_character, 1, 1, NULL, '\r');
288 rtas_call(display_character, 1, 1, NULL, '\n');
289 } else {
290 /* CR might be used to re-draw a line, so we'll
291 * leave it alone and not add LF.
292 */
293 rtas_call(display_character, 1, 1, NULL, *os);
294 }
295
296 if (row_width)
297 width = row_width[current_line];
298 else
299 width = display_width;
300 } else {
301 width--;
302 rtas_call(display_character, 1, 1, NULL, *os);
303 }
304
305 os++;
306
307 /* if we overwrite the screen length */
308 if (width <= 0)
309 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
310 os++;
311 }
312
313 spin_unlock(&progress_lock);
314 }
315 EXPORT_SYMBOL_GPL(rtas_progress); /* needed by rtas_flash module */
316
rtas_token(const char * service)317 int rtas_token(const char *service)
318 {
319 const __be32 *tokp;
320 if (rtas.dev == NULL)
321 return RTAS_UNKNOWN_SERVICE;
322 tokp = of_get_property(rtas.dev, service, NULL);
323 return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE;
324 }
325 EXPORT_SYMBOL_GPL(rtas_token);
326
rtas_service_present(const char * service)327 int rtas_service_present(const char *service)
328 {
329 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
330 }
331 EXPORT_SYMBOL(rtas_service_present);
332
333 #ifdef CONFIG_RTAS_ERROR_LOGGING
334 /*
335 * Return the firmware-specified size of the error log buffer
336 * for all rtas calls that require an error buffer argument.
337 * This includes 'check-exception' and 'rtas-last-error'.
338 */
rtas_get_error_log_max(void)339 int rtas_get_error_log_max(void)
340 {
341 static int rtas_error_log_max;
342 if (rtas_error_log_max)
343 return rtas_error_log_max;
344
345 rtas_error_log_max = rtas_token ("rtas-error-log-max");
346 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
347 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
348 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
349 rtas_error_log_max);
350 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
351 }
352 return rtas_error_log_max;
353 }
354 EXPORT_SYMBOL(rtas_get_error_log_max);
355
356
357 static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
358 static int rtas_last_error_token;
359
360 /** Return a copy of the detailed error text associated with the
361 * most recent failed call to rtas. Because the error text
362 * might go stale if there are any other intervening rtas calls,
363 * this routine must be called atomically with whatever produced
364 * the error (i.e. with rtas.lock still held from the previous call).
365 */
__fetch_rtas_last_error(char * altbuf)366 static char *__fetch_rtas_last_error(char *altbuf)
367 {
368 struct rtas_args err_args, save_args;
369 u32 bufsz;
370 char *buf = NULL;
371
372 if (rtas_last_error_token == -1)
373 return NULL;
374
375 bufsz = rtas_get_error_log_max();
376
377 err_args.token = cpu_to_be32(rtas_last_error_token);
378 err_args.nargs = cpu_to_be32(2);
379 err_args.nret = cpu_to_be32(1);
380 err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf));
381 err_args.args[1] = cpu_to_be32(bufsz);
382 err_args.args[2] = 0;
383
384 save_args = rtas.args;
385 rtas.args = err_args;
386
387 enter_rtas(__pa(&rtas.args));
388
389 err_args = rtas.args;
390 rtas.args = save_args;
391
392 /* Log the error in the unlikely case that there was one. */
393 if (unlikely(err_args.args[2] == 0)) {
394 if (altbuf) {
395 buf = altbuf;
396 } else {
397 buf = rtas_err_buf;
398 if (slab_is_available())
399 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
400 }
401 if (buf)
402 memmove(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
403 }
404
405 return buf;
406 }
407
408 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
409
410 #else /* CONFIG_RTAS_ERROR_LOGGING */
411 #define __fetch_rtas_last_error(x) NULL
412 #define get_errorlog_buffer() NULL
413 #endif
414
415
416 static void
va_rtas_call_unlocked(struct rtas_args * args,int token,int nargs,int nret,va_list list)417 va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret,
418 va_list list)
419 {
420 int i;
421
422 args->token = cpu_to_be32(token);
423 args->nargs = cpu_to_be32(nargs);
424 args->nret = cpu_to_be32(nret);
425 args->rets = &(args->args[nargs]);
426
427 for (i = 0; i < nargs; ++i)
428 args->args[i] = cpu_to_be32(va_arg(list, __u32));
429
430 for (i = 0; i < nret; ++i)
431 args->rets[i] = 0;
432
433 enter_rtas(__pa(args));
434 }
435
rtas_call_unlocked(struct rtas_args * args,int token,int nargs,int nret,...)436 void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...)
437 {
438 va_list list;
439
440 va_start(list, nret);
441 va_rtas_call_unlocked(args, token, nargs, nret, list);
442 va_end(list);
443 }
444
rtas_call(int token,int nargs,int nret,int * outputs,...)445 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
446 {
447 va_list list;
448 int i;
449 unsigned long s;
450 struct rtas_args *rtas_args;
451 char *buff_copy = NULL;
452 int ret;
453
454 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
455 return -1;
456
457 s = lock_rtas();
458
459 /* We use the global rtas args buffer */
460 rtas_args = &rtas.args;
461
462 va_start(list, outputs);
463 va_rtas_call_unlocked(rtas_args, token, nargs, nret, list);
464 va_end(list);
465
466 /* A -1 return code indicates that the last command couldn't
467 be completed due to a hardware error. */
468 if (be32_to_cpu(rtas_args->rets[0]) == -1)
469 buff_copy = __fetch_rtas_last_error(NULL);
470
471 if (nret > 1 && outputs != NULL)
472 for (i = 0; i < nret-1; ++i)
473 outputs[i] = be32_to_cpu(rtas_args->rets[i+1]);
474 ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0;
475
476 unlock_rtas(s);
477
478 if (buff_copy) {
479 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
480 if (slab_is_available())
481 kfree(buff_copy);
482 }
483 return ret;
484 }
485 EXPORT_SYMBOL_GPL(rtas_call);
486
487 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
488 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
489 */
rtas_busy_delay_time(int status)490 unsigned int rtas_busy_delay_time(int status)
491 {
492 int order;
493 unsigned int ms = 0;
494
495 if (status == RTAS_BUSY) {
496 ms = 1;
497 } else if (status >= RTAS_EXTENDED_DELAY_MIN &&
498 status <= RTAS_EXTENDED_DELAY_MAX) {
499 order = status - RTAS_EXTENDED_DELAY_MIN;
500 for (ms = 1; order > 0; order--)
501 ms *= 10;
502 }
503
504 return ms;
505 }
506 EXPORT_SYMBOL(rtas_busy_delay_time);
507
508 /* For an RTAS busy status code, perform the hinted delay. */
rtas_busy_delay(int status)509 unsigned int rtas_busy_delay(int status)
510 {
511 unsigned int ms;
512
513 might_sleep();
514 ms = rtas_busy_delay_time(status);
515 if (ms && need_resched())
516 msleep(ms);
517
518 return ms;
519 }
520 EXPORT_SYMBOL_GPL(rtas_busy_delay);
521
rtas_error_rc(int rtas_rc)522 static int rtas_error_rc(int rtas_rc)
523 {
524 int rc;
525
526 switch (rtas_rc) {
527 case -1: /* Hardware Error */
528 rc = -EIO;
529 break;
530 case -3: /* Bad indicator/domain/etc */
531 rc = -EINVAL;
532 break;
533 case -9000: /* Isolation error */
534 rc = -EFAULT;
535 break;
536 case -9001: /* Outstanding TCE/PTE */
537 rc = -EEXIST;
538 break;
539 case -9002: /* No usable slot */
540 rc = -ENODEV;
541 break;
542 default:
543 printk(KERN_ERR "%s: unexpected RTAS error %d\n",
544 __func__, rtas_rc);
545 rc = -ERANGE;
546 break;
547 }
548 return rc;
549 }
550
rtas_get_power_level(int powerdomain,int * level)551 int rtas_get_power_level(int powerdomain, int *level)
552 {
553 int token = rtas_token("get-power-level");
554 int rc;
555
556 if (token == RTAS_UNKNOWN_SERVICE)
557 return -ENOENT;
558
559 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
560 udelay(1);
561
562 if (rc < 0)
563 return rtas_error_rc(rc);
564 return rc;
565 }
566 EXPORT_SYMBOL_GPL(rtas_get_power_level);
567
rtas_set_power_level(int powerdomain,int level,int * setlevel)568 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
569 {
570 int token = rtas_token("set-power-level");
571 int rc;
572
573 if (token == RTAS_UNKNOWN_SERVICE)
574 return -ENOENT;
575
576 do {
577 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
578 } while (rtas_busy_delay(rc));
579
580 if (rc < 0)
581 return rtas_error_rc(rc);
582 return rc;
583 }
584 EXPORT_SYMBOL_GPL(rtas_set_power_level);
585
rtas_get_sensor(int sensor,int index,int * state)586 int rtas_get_sensor(int sensor, int index, int *state)
587 {
588 int token = rtas_token("get-sensor-state");
589 int rc;
590
591 if (token == RTAS_UNKNOWN_SERVICE)
592 return -ENOENT;
593
594 do {
595 rc = rtas_call(token, 2, 2, state, sensor, index);
596 } while (rtas_busy_delay(rc));
597
598 if (rc < 0)
599 return rtas_error_rc(rc);
600 return rc;
601 }
602 EXPORT_SYMBOL_GPL(rtas_get_sensor);
603
rtas_get_sensor_fast(int sensor,int index,int * state)604 int rtas_get_sensor_fast(int sensor, int index, int *state)
605 {
606 int token = rtas_token("get-sensor-state");
607 int rc;
608
609 if (token == RTAS_UNKNOWN_SERVICE)
610 return -ENOENT;
611
612 rc = rtas_call(token, 2, 2, state, sensor, index);
613 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
614 rc <= RTAS_EXTENDED_DELAY_MAX));
615
616 if (rc < 0)
617 return rtas_error_rc(rc);
618 return rc;
619 }
620
rtas_indicator_present(int token,int * maxindex)621 bool rtas_indicator_present(int token, int *maxindex)
622 {
623 int proplen, count, i;
624 const struct indicator_elem {
625 __be32 token;
626 __be32 maxindex;
627 } *indicators;
628
629 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
630 if (!indicators)
631 return false;
632
633 count = proplen / sizeof(struct indicator_elem);
634
635 for (i = 0; i < count; i++) {
636 if (__be32_to_cpu(indicators[i].token) != token)
637 continue;
638 if (maxindex)
639 *maxindex = __be32_to_cpu(indicators[i].maxindex);
640 return true;
641 }
642
643 return false;
644 }
645 EXPORT_SYMBOL(rtas_indicator_present);
646
rtas_set_indicator(int indicator,int index,int new_value)647 int rtas_set_indicator(int indicator, int index, int new_value)
648 {
649 int token = rtas_token("set-indicator");
650 int rc;
651
652 if (token == RTAS_UNKNOWN_SERVICE)
653 return -ENOENT;
654
655 do {
656 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
657 } while (rtas_busy_delay(rc));
658
659 if (rc < 0)
660 return rtas_error_rc(rc);
661 return rc;
662 }
663 EXPORT_SYMBOL_GPL(rtas_set_indicator);
664
665 /*
666 * Ignoring RTAS extended delay
667 */
rtas_set_indicator_fast(int indicator,int index,int new_value)668 int rtas_set_indicator_fast(int indicator, int index, int new_value)
669 {
670 int rc;
671 int token = rtas_token("set-indicator");
672
673 if (token == RTAS_UNKNOWN_SERVICE)
674 return -ENOENT;
675
676 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
677
678 WARN_ON(rc == RTAS_BUSY || (rc >= RTAS_EXTENDED_DELAY_MIN &&
679 rc <= RTAS_EXTENDED_DELAY_MAX));
680
681 if (rc < 0)
682 return rtas_error_rc(rc);
683
684 return rc;
685 }
686
rtas_restart(char * cmd)687 void __noreturn rtas_restart(char *cmd)
688 {
689 if (rtas_flash_term_hook)
690 rtas_flash_term_hook(SYS_RESTART);
691 printk("RTAS system-reboot returned %d\n",
692 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
693 for (;;);
694 }
695
rtas_power_off(void)696 void rtas_power_off(void)
697 {
698 if (rtas_flash_term_hook)
699 rtas_flash_term_hook(SYS_POWER_OFF);
700 /* allow power on only with power button press */
701 printk("RTAS power-off returned %d\n",
702 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
703 for (;;);
704 }
705
rtas_halt(void)706 void __noreturn rtas_halt(void)
707 {
708 if (rtas_flash_term_hook)
709 rtas_flash_term_hook(SYS_HALT);
710 /* allow power on only with power button press */
711 printk("RTAS power-off returned %d\n",
712 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
713 for (;;);
714 }
715
716 /* Must be in the RMO region, so we place it here */
717 static char rtas_os_term_buf[2048];
718 static s32 ibm_os_term_token = RTAS_UNKNOWN_SERVICE;
719
rtas_os_term(char * str)720 void rtas_os_term(char *str)
721 {
722 int status;
723
724 /*
725 * Firmware with the ibm,extended-os-term property is guaranteed
726 * to always return from an ibm,os-term call. Earlier versions without
727 * this property may terminate the partition which we want to avoid
728 * since it interferes with panic_timeout.
729 */
730 if (ibm_os_term_token == RTAS_UNKNOWN_SERVICE)
731 return;
732
733 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
734
735 /*
736 * Keep calling as long as RTAS returns a "try again" status,
737 * but don't use rtas_busy_delay(), which potentially
738 * schedules.
739 */
740 do {
741 status = rtas_call(ibm_os_term_token, 1, 1, NULL,
742 __pa(rtas_os_term_buf));
743 } while (rtas_busy_delay_time(status));
744
745 if (status != 0)
746 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
747 }
748
749 static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
750 #ifdef CONFIG_PPC_PSERIES
__rtas_suspend_last_cpu(struct rtas_suspend_me_data * data,int wake_when_done)751 static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
752 {
753 u16 slb_size = mmu_slb_size;
754 int rc = H_MULTI_THREADS_ACTIVE;
755 int cpu;
756
757 slb_set_size(SLB_MIN_SIZE);
758 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
759
760 while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
761 !atomic_read(&data->error))
762 rc = rtas_call(data->token, 0, 1, NULL);
763
764 if (rc || atomic_read(&data->error)) {
765 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
766 slb_set_size(slb_size);
767 }
768
769 if (atomic_read(&data->error))
770 rc = atomic_read(&data->error);
771
772 atomic_set(&data->error, rc);
773 pSeries_coalesce_init();
774
775 if (wake_when_done) {
776 atomic_set(&data->done, 1);
777
778 for_each_online_cpu(cpu)
779 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
780 }
781
782 if (atomic_dec_return(&data->working) == 0)
783 complete(data->complete);
784
785 return rc;
786 }
787
rtas_suspend_last_cpu(struct rtas_suspend_me_data * data)788 int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
789 {
790 atomic_inc(&data->working);
791 return __rtas_suspend_last_cpu(data, 0);
792 }
793
__rtas_suspend_cpu(struct rtas_suspend_me_data * data,int wake_when_done)794 static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
795 {
796 long rc = H_SUCCESS;
797 unsigned long msr_save;
798 int cpu;
799
800 atomic_inc(&data->working);
801
802 /* really need to ensure MSR.EE is off for H_JOIN */
803 msr_save = mfmsr();
804 mtmsr(msr_save & ~(MSR_EE));
805
806 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
807 rc = plpar_hcall_norets(H_JOIN);
808
809 mtmsr(msr_save);
810
811 if (rc == H_SUCCESS) {
812 /* This cpu was prodded and the suspend is complete. */
813 goto out;
814 } else if (rc == H_CONTINUE) {
815 /* All other cpus are in H_JOIN, this cpu does
816 * the suspend.
817 */
818 return __rtas_suspend_last_cpu(data, wake_when_done);
819 } else {
820 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
821 smp_processor_id(), rc);
822 atomic_set(&data->error, rc);
823 }
824
825 if (wake_when_done) {
826 atomic_set(&data->done, 1);
827
828 /* This cpu did the suspend or got an error; in either case,
829 * we need to prod all other other cpus out of join state.
830 * Extra prods are harmless.
831 */
832 for_each_online_cpu(cpu)
833 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
834 }
835 out:
836 if (atomic_dec_return(&data->working) == 0)
837 complete(data->complete);
838 return rc;
839 }
840
rtas_suspend_cpu(struct rtas_suspend_me_data * data)841 int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
842 {
843 return __rtas_suspend_cpu(data, 0);
844 }
845
rtas_percpu_suspend_me(void * info)846 static void rtas_percpu_suspend_me(void *info)
847 {
848 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
849 }
850
rtas_ibm_suspend_me(u64 handle)851 int rtas_ibm_suspend_me(u64 handle)
852 {
853 long state;
854 long rc;
855 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
856 struct rtas_suspend_me_data data;
857 DECLARE_COMPLETION_ONSTACK(done);
858
859 if (!rtas_service_present("ibm,suspend-me"))
860 return -ENOSYS;
861
862 /* Make sure the state is valid */
863 rc = plpar_hcall(H_VASI_STATE, retbuf, handle);
864
865 state = retbuf[0];
866
867 if (rc) {
868 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
869 return rc;
870 } else if (state == H_VASI_ENABLED) {
871 return -EAGAIN;
872 } else if (state != H_VASI_SUSPENDING) {
873 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
874 state);
875 return -EIO;
876 }
877
878 atomic_set(&data.working, 0);
879 atomic_set(&data.done, 0);
880 atomic_set(&data.error, 0);
881 data.token = rtas_token("ibm,suspend-me");
882 data.complete = &done;
883
884 lock_device_hotplug();
885
886 cpu_hotplug_disable();
887
888 /* Call function on all CPUs. One of us will make the
889 * rtas call
890 */
891 on_each_cpu(rtas_percpu_suspend_me, &data, 0);
892
893 wait_for_completion(&done);
894
895 if (atomic_read(&data.error) != 0)
896 printk(KERN_ERR "Error doing global join\n");
897
898
899 cpu_hotplug_enable();
900
901 unlock_device_hotplug();
902
903 return atomic_read(&data.error);
904 }
905
906 /**
907 * rtas_call_reentrant() - Used for reentrant rtas calls
908 * @token: Token for desired reentrant RTAS call
909 * @nargs: Number of Input Parameters
910 * @nret: Number of Output Parameters
911 * @outputs: Array of outputs
912 * @...: Inputs for desired RTAS call
913 *
914 * According to LoPAR documentation, only "ibm,int-on", "ibm,int-off",
915 * "ibm,get-xive" and "ibm,set-xive" are currently reentrant.
916 * Reentrant calls need their own rtas_args buffer, so not using rtas.args, but
917 * PACA one instead.
918 *
919 * Return: -1 on error,
920 * First output value of RTAS call if (nret > 0),
921 * 0 otherwise,
922 */
rtas_call_reentrant(int token,int nargs,int nret,int * outputs,...)923 int rtas_call_reentrant(int token, int nargs, int nret, int *outputs, ...)
924 {
925 va_list list;
926 struct rtas_args *args;
927 unsigned long flags;
928 int i, ret = 0;
929
930 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
931 return -1;
932
933 local_irq_save(flags);
934 preempt_disable();
935
936 /* We use the per-cpu (PACA) rtas args buffer */
937 args = local_paca->rtas_args_reentrant;
938
939 va_start(list, outputs);
940 va_rtas_call_unlocked(args, token, nargs, nret, list);
941 va_end(list);
942
943 if (nret > 1 && outputs)
944 for (i = 0; i < nret - 1; ++i)
945 outputs[i] = be32_to_cpu(args->rets[i + 1]);
946
947 if (nret > 0)
948 ret = be32_to_cpu(args->rets[0]);
949
950 local_irq_restore(flags);
951 preempt_enable();
952
953 return ret;
954 }
955
956 #else /* CONFIG_PPC_PSERIES */
rtas_ibm_suspend_me(u64 handle)957 int rtas_ibm_suspend_me(u64 handle)
958 {
959 return -ENOSYS;
960 }
961 #endif
962
963 /**
964 * Find a specific pseries error log in an RTAS extended event log.
965 * @log: RTAS error/event log
966 * @section_id: two character section identifier
967 *
968 * Returns a pointer to the specified errorlog or NULL if not found.
969 */
get_pseries_errorlog(struct rtas_error_log * log,uint16_t section_id)970 struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
971 uint16_t section_id)
972 {
973 struct rtas_ext_event_log_v6 *ext_log =
974 (struct rtas_ext_event_log_v6 *)log->buffer;
975 struct pseries_errorlog *sect;
976 unsigned char *p, *log_end;
977 uint32_t ext_log_length = rtas_error_extended_log_length(log);
978 uint8_t log_format = rtas_ext_event_log_format(ext_log);
979 uint32_t company_id = rtas_ext_event_company_id(ext_log);
980
981 /* Check that we understand the format */
982 if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) ||
983 log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
984 company_id != RTAS_V6EXT_COMPANY_ID_IBM)
985 return NULL;
986
987 log_end = log->buffer + ext_log_length;
988 p = ext_log->vendor_log;
989
990 while (p < log_end) {
991 sect = (struct pseries_errorlog *)p;
992 if (pseries_errorlog_id(sect) == section_id)
993 return sect;
994 p += pseries_errorlog_length(sect);
995 }
996
997 return NULL;
998 }
999
1000 #ifdef CONFIG_PPC_RTAS_FILTER
1001
1002 /*
1003 * The sys_rtas syscall, as originally designed, allows root to pass
1004 * arbitrary physical addresses to RTAS calls. A number of RTAS calls
1005 * can be abused to write to arbitrary memory and do other things that
1006 * are potentially harmful to system integrity, and thus should only
1007 * be used inside the kernel and not exposed to userspace.
1008 *
1009 * All known legitimate users of the sys_rtas syscall will only ever
1010 * pass addresses that fall within the RMO buffer, and use a known
1011 * subset of RTAS calls.
1012 *
1013 * Accordingly, we filter RTAS requests to check that the call is
1014 * permitted, and that provided pointers fall within the RMO buffer.
1015 * The rtas_filters list contains an entry for each permitted call,
1016 * with the indexes of the parameters which are expected to contain
1017 * addresses and sizes of buffers allocated inside the RMO buffer.
1018 */
1019 struct rtas_filter {
1020 const char *name;
1021 int token;
1022 /* Indexes into the args buffer, -1 if not used */
1023 int buf_idx1;
1024 int size_idx1;
1025 int buf_idx2;
1026 int size_idx2;
1027
1028 int fixed_size;
1029 };
1030
1031 static struct rtas_filter rtas_filters[] __ro_after_init = {
1032 { "ibm,activate-firmware", -1, -1, -1, -1, -1 },
1033 { "ibm,configure-connector", -1, 0, -1, 1, -1, 4096 }, /* Special cased */
1034 { "display-character", -1, -1, -1, -1, -1 },
1035 { "ibm,display-message", -1, 0, -1, -1, -1 },
1036 { "ibm,errinjct", -1, 2, -1, -1, -1, 1024 },
1037 { "ibm,close-errinjct", -1, -1, -1, -1, -1 },
1038 { "ibm,open-errinjct", -1, -1, -1, -1, -1 },
1039 { "ibm,get-config-addr-info2", -1, -1, -1, -1, -1 },
1040 { "ibm,get-dynamic-sensor-state", -1, 1, -1, -1, -1 },
1041 { "ibm,get-indices", -1, 2, 3, -1, -1 },
1042 { "get-power-level", -1, -1, -1, -1, -1 },
1043 { "get-sensor-state", -1, -1, -1, -1, -1 },
1044 { "ibm,get-system-parameter", -1, 1, 2, -1, -1 },
1045 { "get-time-of-day", -1, -1, -1, -1, -1 },
1046 { "ibm,get-vpd", -1, 0, -1, 1, 2 },
1047 { "ibm,lpar-perftools", -1, 2, 3, -1, -1 },
1048 { "ibm,platform-dump", -1, 4, 5, -1, -1 }, /* Special cased */
1049 { "ibm,read-slot-reset-state", -1, -1, -1, -1, -1 },
1050 { "ibm,scan-log-dump", -1, 0, 1, -1, -1 },
1051 { "ibm,set-dynamic-indicator", -1, 2, -1, -1, -1 },
1052 { "ibm,set-eeh-option", -1, -1, -1, -1, -1 },
1053 { "set-indicator", -1, -1, -1, -1, -1 },
1054 { "set-power-level", -1, -1, -1, -1, -1 },
1055 { "set-time-for-power-on", -1, -1, -1, -1, -1 },
1056 { "ibm,set-system-parameter", -1, 1, -1, -1, -1 },
1057 { "set-time-of-day", -1, -1, -1, -1, -1 },
1058 { "ibm,suspend-me", -1, -1, -1, -1, -1 },
1059 { "ibm,update-nodes", -1, 0, -1, -1, -1, 4096 },
1060 { "ibm,update-properties", -1, 0, -1, -1, -1, 4096 },
1061 { "ibm,physical-attestation", -1, 0, 1, -1, -1 },
1062 };
1063
in_rmo_buf(u32 base,u32 end)1064 static bool in_rmo_buf(u32 base, u32 end)
1065 {
1066 return base >= rtas_rmo_buf &&
1067 base < (rtas_rmo_buf + RTAS_RMOBUF_MAX) &&
1068 base <= end &&
1069 end >= rtas_rmo_buf &&
1070 end < (rtas_rmo_buf + RTAS_RMOBUF_MAX);
1071 }
1072
block_rtas_call(int token,int nargs,struct rtas_args * args)1073 static bool block_rtas_call(int token, int nargs,
1074 struct rtas_args *args)
1075 {
1076 int i;
1077
1078 for (i = 0; i < ARRAY_SIZE(rtas_filters); i++) {
1079 struct rtas_filter *f = &rtas_filters[i];
1080 u32 base, size, end;
1081
1082 if (token != f->token)
1083 continue;
1084
1085 if (f->buf_idx1 != -1) {
1086 base = be32_to_cpu(args->args[f->buf_idx1]);
1087 if (f->size_idx1 != -1)
1088 size = be32_to_cpu(args->args[f->size_idx1]);
1089 else if (f->fixed_size)
1090 size = f->fixed_size;
1091 else
1092 size = 1;
1093
1094 end = base + size - 1;
1095
1096 /*
1097 * Special case for ibm,platform-dump - NULL buffer
1098 * address is used to indicate end of dump processing
1099 */
1100 if (!strcmp(f->name, "ibm,platform-dump") &&
1101 base == 0)
1102 return false;
1103
1104 if (!in_rmo_buf(base, end))
1105 goto err;
1106 }
1107
1108 if (f->buf_idx2 != -1) {
1109 base = be32_to_cpu(args->args[f->buf_idx2]);
1110 if (f->size_idx2 != -1)
1111 size = be32_to_cpu(args->args[f->size_idx2]);
1112 else if (f->fixed_size)
1113 size = f->fixed_size;
1114 else
1115 size = 1;
1116 end = base + size - 1;
1117
1118 /*
1119 * Special case for ibm,configure-connector where the
1120 * address can be 0
1121 */
1122 if (!strcmp(f->name, "ibm,configure-connector") &&
1123 base == 0)
1124 return false;
1125
1126 if (!in_rmo_buf(base, end))
1127 goto err;
1128 }
1129
1130 return false;
1131 }
1132
1133 err:
1134 pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n");
1135 pr_err_ratelimited("sys_rtas: token=0x%x, nargs=%d (called by %s)\n",
1136 token, nargs, current->comm);
1137 return true;
1138 }
1139
1140 #else
1141
block_rtas_call(int token,int nargs,struct rtas_args * args)1142 static bool block_rtas_call(int token, int nargs,
1143 struct rtas_args *args)
1144 {
1145 return false;
1146 }
1147
1148 #endif /* CONFIG_PPC_RTAS_FILTER */
1149
1150 /* We assume to be passed big endian arguments */
SYSCALL_DEFINE1(rtas,struct rtas_args __user *,uargs)1151 SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
1152 {
1153 struct rtas_args args;
1154 unsigned long flags;
1155 char *buff_copy, *errbuf = NULL;
1156 int nargs, nret, token;
1157
1158 if (!capable(CAP_SYS_ADMIN))
1159 return -EPERM;
1160
1161 if (!rtas.entry)
1162 return -EINVAL;
1163
1164 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
1165 return -EFAULT;
1166
1167 nargs = be32_to_cpu(args.nargs);
1168 nret = be32_to_cpu(args.nret);
1169 token = be32_to_cpu(args.token);
1170
1171 if (nargs >= ARRAY_SIZE(args.args)
1172 || nret > ARRAY_SIZE(args.args)
1173 || nargs + nret > ARRAY_SIZE(args.args))
1174 return -EINVAL;
1175
1176 /* Copy in args. */
1177 if (copy_from_user(args.args, uargs->args,
1178 nargs * sizeof(rtas_arg_t)) != 0)
1179 return -EFAULT;
1180
1181 if (token == RTAS_UNKNOWN_SERVICE)
1182 return -EINVAL;
1183
1184 args.rets = &args.args[nargs];
1185 memset(args.rets, 0, nret * sizeof(rtas_arg_t));
1186
1187 if (block_rtas_call(token, nargs, &args))
1188 return -EINVAL;
1189
1190 /* Need to handle ibm,suspend_me call specially */
1191 if (token == ibm_suspend_me_token) {
1192
1193 /*
1194 * rtas_ibm_suspend_me assumes the streamid handle is in cpu
1195 * endian, or at least the hcall within it requires it.
1196 */
1197 int rc = 0;
1198 u64 handle = ((u64)be32_to_cpu(args.args[0]) << 32)
1199 | be32_to_cpu(args.args[1]);
1200 rc = rtas_ibm_suspend_me(handle);
1201 if (rc == -EAGAIN)
1202 args.rets[0] = cpu_to_be32(RTAS_NOT_SUSPENDABLE);
1203 else if (rc == -EIO)
1204 args.rets[0] = cpu_to_be32(-1);
1205 else if (rc)
1206 return rc;
1207 goto copy_return;
1208 }
1209
1210 buff_copy = get_errorlog_buffer();
1211
1212 flags = lock_rtas();
1213
1214 rtas.args = args;
1215 enter_rtas(__pa(&rtas.args));
1216 args = rtas.args;
1217
1218 /* A -1 return code indicates that the last command couldn't
1219 be completed due to a hardware error. */
1220 if (be32_to_cpu(args.rets[0]) == -1)
1221 errbuf = __fetch_rtas_last_error(buff_copy);
1222
1223 unlock_rtas(flags);
1224
1225 if (buff_copy) {
1226 if (errbuf)
1227 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
1228 kfree(buff_copy);
1229 }
1230
1231 copy_return:
1232 /* Copy out args. */
1233 if (copy_to_user(uargs->args + nargs,
1234 args.args + nargs,
1235 nret * sizeof(rtas_arg_t)) != 0)
1236 return -EFAULT;
1237
1238 return 0;
1239 }
1240
1241 /*
1242 * Call early during boot, before mem init, to retrieve the RTAS
1243 * information from the device-tree and allocate the RMO buffer for userland
1244 * accesses.
1245 */
rtas_initialize(void)1246 void __init rtas_initialize(void)
1247 {
1248 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
1249 u32 base, size, entry;
1250 int no_base, no_size, no_entry;
1251 #ifdef CONFIG_PPC_RTAS_FILTER
1252 int i;
1253 #endif
1254
1255 /* Get RTAS dev node and fill up our "rtas" structure with infos
1256 * about it.
1257 */
1258 rtas.dev = of_find_node_by_name(NULL, "rtas");
1259 if (!rtas.dev)
1260 return;
1261
1262 no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);
1263 no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);
1264 if (no_base || no_size) {
1265 of_node_put(rtas.dev);
1266 rtas.dev = NULL;
1267 return;
1268 }
1269
1270 rtas.base = base;
1271 rtas.size = size;
1272 no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);
1273 rtas.entry = no_entry ? rtas.base : entry;
1274
1275 /*
1276 * Discover these now to avoid device tree lookups in the
1277 * panic path.
1278 */
1279 if (of_property_read_bool(rtas.dev, "ibm,extended-os-term"))
1280 ibm_os_term_token = rtas_token("ibm,os-term");
1281
1282 /* If RTAS was found, allocate the RMO buffer for it and look for
1283 * the stop-self token if any
1284 */
1285 #ifdef CONFIG_PPC64
1286 if (firmware_has_feature(FW_FEATURE_LPAR)) {
1287 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
1288 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
1289 }
1290 #endif
1291 rtas_rmo_buf = memblock_phys_alloc_range(RTAS_RMOBUF_MAX, PAGE_SIZE,
1292 0, rtas_region);
1293 if (!rtas_rmo_buf)
1294 panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",
1295 PAGE_SIZE, &rtas_region);
1296
1297 #ifdef CONFIG_RTAS_ERROR_LOGGING
1298 rtas_last_error_token = rtas_token("rtas-last-error");
1299 #endif
1300
1301 #ifdef CONFIG_PPC_RTAS_FILTER
1302 for (i = 0; i < ARRAY_SIZE(rtas_filters); i++) {
1303 rtas_filters[i].token = rtas_token(rtas_filters[i].name);
1304 }
1305 #endif
1306 }
1307
early_init_dt_scan_rtas(unsigned long node,const char * uname,int depth,void * data)1308 int __init early_init_dt_scan_rtas(unsigned long node,
1309 const char *uname, int depth, void *data)
1310 {
1311 const u32 *basep, *entryp, *sizep;
1312
1313 if (depth != 1 || strcmp(uname, "rtas") != 0)
1314 return 0;
1315
1316 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
1317 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
1318 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
1319
1320 #ifdef CONFIG_PPC64
1321 /* need this feature to decide the crashkernel offset */
1322 if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL))
1323 powerpc_firmware_features |= FW_FEATURE_LPAR;
1324 #endif
1325
1326 if (basep && entryp && sizep) {
1327 rtas.base = *basep;
1328 rtas.entry = *entryp;
1329 rtas.size = *sizep;
1330 }
1331
1332 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1333 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1334 if (basep)
1335 rtas_putchar_token = *basep;
1336
1337 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1338 if (basep)
1339 rtas_getchar_token = *basep;
1340
1341 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1342 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1343 udbg_init_rtas_console();
1344
1345 #endif
1346
1347 /* break now */
1348 return 1;
1349 }
1350
1351 static arch_spinlock_t timebase_lock;
1352 static u64 timebase = 0;
1353
rtas_give_timebase(void)1354 void rtas_give_timebase(void)
1355 {
1356 unsigned long flags;
1357
1358 local_irq_save(flags);
1359 hard_irq_disable();
1360 arch_spin_lock(&timebase_lock);
1361 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1362 timebase = get_tb();
1363 arch_spin_unlock(&timebase_lock);
1364
1365 while (timebase)
1366 barrier();
1367 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1368 local_irq_restore(flags);
1369 }
1370
rtas_take_timebase(void)1371 void rtas_take_timebase(void)
1372 {
1373 while (!timebase)
1374 barrier();
1375 arch_spin_lock(&timebase_lock);
1376 set_tb(timebase >> 32, timebase & 0xffffffff);
1377 timebase = 0;
1378 arch_spin_unlock(&timebase_lock);
1379 }
1380