Commit | Line | Data |
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1da177e4 LT |
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> | |
21fe3301 | 20 | #include <linux/delay.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
29 | #include <asm/delay.h> |
30 | #include <asm/uaccess.h> | |
033ef338 PM |
31 | #include <asm/lmb.h> |
32 | #ifdef CONFIG_PPC64 | |
1da177e4 | 33 | #include <asm/systemcfg.h> |
033ef338 | 34 | #endif |
1da177e4 | 35 | |
033ef338 | 36 | struct rtas_t rtas = { |
1da177e4 LT |
37 | .lock = SPIN_LOCK_UNLOCKED |
38 | }; | |
39 | ||
40 | EXPORT_SYMBOL(rtas); | |
41 | ||
1da177e4 | 42 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
033ef338 | 43 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
1da177e4 LT |
44 | unsigned long rtas_rmo_buf; |
45 | ||
f4fcbbe9 PM |
46 | /* |
47 | * If non-NULL, this gets called when the kernel terminates. | |
48 | * This is done like this so rtas_flash can be a module. | |
49 | */ | |
50 | void (*rtas_flash_term_hook)(int); | |
51 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
52 | ||
033ef338 PM |
53 | /* |
54 | * call_rtas_display_status and call_rtas_display_status_delay | |
55 | * are designed only for very early low-level debugging, which | |
56 | * is why the token is hard-coded to 10. | |
57 | */ | |
58 | void call_rtas_display_status(unsigned char c) | |
1da177e4 LT |
59 | { |
60 | struct rtas_args *args = &rtas.args; | |
61 | unsigned long s; | |
62 | ||
63 | if (!rtas.base) | |
64 | return; | |
65 | spin_lock_irqsave(&rtas.lock, s); | |
66 | ||
67 | args->token = 10; | |
68 | args->nargs = 1; | |
69 | args->nret = 1; | |
70 | args->rets = (rtas_arg_t *)&(args->args[1]); | |
71 | args->args[0] = (int)c; | |
72 | ||
73 | enter_rtas(__pa(args)); | |
74 | ||
75 | spin_unlock_irqrestore(&rtas.lock, s); | |
76 | } | |
77 | ||
033ef338 | 78 | void call_rtas_display_status_delay(unsigned char c) |
1da177e4 LT |
79 | { |
80 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
81 | static int width = 16; | |
82 | ||
83 | if (c == '\n') { | |
84 | while (width-- > 0) | |
85 | call_rtas_display_status(' '); | |
86 | width = 16; | |
21fe3301 | 87 | mdelay(500); |
1da177e4 LT |
88 | pending_newline = 1; |
89 | } else { | |
90 | if (pending_newline) { | |
91 | call_rtas_display_status('\r'); | |
92 | call_rtas_display_status('\n'); | |
93 | } | |
94 | pending_newline = 0; | |
95 | if (width--) { | |
96 | call_rtas_display_status(c); | |
97 | udelay(10000); | |
98 | } | |
99 | } | |
100 | } | |
101 | ||
033ef338 | 102 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
103 | { |
104 | struct device_node *root; | |
105 | int width, *p; | |
106 | char *os; | |
107 | static int display_character, set_indicator; | |
8f586b22 | 108 | static int display_width, display_lines, *row_width, form_feed; |
6566c6f1 | 109 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 110 | static int current_line; |
6566c6f1 AB |
111 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
112 | ||
113 | if (!rtas.base) | |
114 | return; | |
115 | ||
8f586b22 MS |
116 | if (display_width == 0) { |
117 | display_width = 0x10; | |
118 | if ((root = find_path_device("/rtas"))) { | |
119 | if ((p = (unsigned int *)get_property(root, | |
120 | "ibm,display-line-length", NULL))) | |
121 | display_width = *p; | |
122 | if ((p = (unsigned int *)get_property(root, | |
123 | "ibm,form-feed", NULL))) | |
124 | form_feed = *p; | |
125 | if ((p = (unsigned int *)get_property(root, | |
126 | "ibm,display-number-of-lines", NULL))) | |
127 | display_lines = *p; | |
128 | row_width = (unsigned int *)get_property(root, | |
129 | "ibm,display-truncation-length", NULL); | |
130 | } | |
6566c6f1 AB |
131 | display_character = rtas_token("display-character"); |
132 | set_indicator = rtas_token("set-indicator"); | |
133 | } | |
134 | ||
135 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
136 | /* use hex display if available */ | |
137 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
138 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
139 | return; | |
140 | } | |
141 | ||
142 | spin_lock(&progress_lock); | |
143 | ||
144 | /* | |
145 | * Last write ended with newline, but we didn't print it since | |
146 | * it would just clear the bottom line of output. Print it now | |
147 | * instead. | |
148 | * | |
8f586b22 MS |
149 | * If no newline is pending and form feed is supported, clear the |
150 | * display with a form feed; otherwise, print a CR to start output | |
151 | * at the beginning of the line. | |
6566c6f1 AB |
152 | */ |
153 | if (pending_newline) { | |
154 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
155 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
156 | pending_newline = 0; | |
157 | } else { | |
8f586b22 MS |
158 | current_line = 0; |
159 | if (form_feed) | |
160 | rtas_call(display_character, 1, 1, NULL, | |
161 | (char)form_feed); | |
162 | else | |
163 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
164 | } |
165 | ||
8f586b22 MS |
166 | if (row_width) |
167 | width = row_width[current_line]; | |
168 | else | |
169 | width = display_width; | |
6566c6f1 AB |
170 | os = s; |
171 | while (*os) { | |
172 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
173 | /* If newline is the last character, save it |
174 | * until next call to avoid bumping up the | |
175 | * display output. | |
176 | */ | |
177 | if (*os == '\n' && !os[1]) { | |
178 | pending_newline = 1; | |
8f586b22 MS |
179 | current_line++; |
180 | if (current_line > display_lines-1) | |
181 | current_line = display_lines-1; | |
6566c6f1 AB |
182 | spin_unlock(&progress_lock); |
183 | return; | |
184 | } | |
185 | ||
186 | /* RTAS wants CR-LF, not just LF */ | |
187 | ||
188 | if (*os == '\n') { | |
189 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
190 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
191 | } else { | |
192 | /* CR might be used to re-draw a line, so we'll | |
193 | * leave it alone and not add LF. | |
194 | */ | |
195 | rtas_call(display_character, 1, 1, NULL, *os); | |
196 | } | |
197 | ||
8f586b22 MS |
198 | if (row_width) |
199 | width = row_width[current_line]; | |
200 | else | |
201 | width = display_width; | |
6566c6f1 AB |
202 | } else { |
203 | width--; | |
204 | rtas_call(display_character, 1, 1, NULL, *os); | |
205 | } | |
206 | ||
207 | os++; | |
208 | ||
209 | /* if we overwrite the screen length */ | |
210 | if (width <= 0) | |
211 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
212 | os++; | |
213 | } | |
214 | ||
6566c6f1 AB |
215 | spin_unlock(&progress_lock); |
216 | } | |
f4fcbbe9 | 217 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 218 | |
033ef338 | 219 | int rtas_token(const char *service) |
1da177e4 LT |
220 | { |
221 | int *tokp; | |
033ef338 | 222 | if (rtas.dev == NULL) |
1da177e4 | 223 | return RTAS_UNKNOWN_SERVICE; |
1da177e4 LT |
224 | tokp = (int *) get_property(rtas.dev, service, NULL); |
225 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; | |
226 | } | |
227 | ||
033ef338 | 228 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
229 | /* |
230 | * Return the firmware-specified size of the error log buffer | |
231 | * for all rtas calls that require an error buffer argument. | |
232 | * This includes 'check-exception' and 'rtas-last-error'. | |
233 | */ | |
234 | int rtas_get_error_log_max(void) | |
235 | { | |
236 | static int rtas_error_log_max; | |
237 | if (rtas_error_log_max) | |
238 | return rtas_error_log_max; | |
239 | ||
240 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
241 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
242 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
243 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
244 | rtas_error_log_max); | |
1da177e4 LT |
245 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
246 | } | |
247 | return rtas_error_log_max; | |
248 | } | |
033ef338 | 249 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
250 | |
251 | ||
033ef338 PM |
252 | char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
253 | int rtas_last_error_token; | |
254 | ||
1da177e4 LT |
255 | /** Return a copy of the detailed error text associated with the |
256 | * most recent failed call to rtas. Because the error text | |
257 | * might go stale if there are any other intervening rtas calls, | |
258 | * this routine must be called atomically with whatever produced | |
259 | * the error (i.e. with rtas.lock still held from the previous call). | |
260 | */ | |
033ef338 | 261 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
262 | { |
263 | struct rtas_args err_args, save_args; | |
264 | u32 bufsz; | |
033ef338 PM |
265 | char *buf = NULL; |
266 | ||
267 | if (rtas_last_error_token == -1) | |
268 | return NULL; | |
1da177e4 LT |
269 | |
270 | bufsz = rtas_get_error_log_max(); | |
271 | ||
033ef338 | 272 | err_args.token = rtas_last_error_token; |
1da177e4 LT |
273 | err_args.nargs = 2; |
274 | err_args.nret = 1; | |
1da177e4 LT |
275 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
276 | err_args.args[1] = bufsz; | |
277 | err_args.args[2] = 0; | |
278 | ||
279 | save_args = rtas.args; | |
280 | rtas.args = err_args; | |
281 | ||
282 | enter_rtas(__pa(&rtas.args)); | |
283 | ||
284 | err_args = rtas.args; | |
285 | rtas.args = save_args; | |
286 | ||
033ef338 PM |
287 | /* Log the error in the unlikely case that there was one. */ |
288 | if (unlikely(err_args.args[2] == 0)) { | |
289 | if (altbuf) { | |
290 | buf = altbuf; | |
291 | } else { | |
292 | buf = rtas_err_buf; | |
293 | if (mem_init_done) | |
294 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
295 | } | |
296 | if (buf) | |
297 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
298 | } | |
299 | ||
300 | return buf; | |
1da177e4 LT |
301 | } |
302 | ||
033ef338 PM |
303 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
304 | ||
305 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
306 | #define __fetch_rtas_last_error(x) NULL | |
307 | #define get_errorlog_buffer() NULL | |
308 | #endif | |
309 | ||
1da177e4 LT |
310 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
311 | { | |
312 | va_list list; | |
033ef338 | 313 | int i; |
1da177e4 LT |
314 | unsigned long s; |
315 | struct rtas_args *rtas_args; | |
033ef338 | 316 | char *buff_copy = NULL; |
1da177e4 LT |
317 | int ret; |
318 | ||
1da177e4 LT |
319 | if (token == RTAS_UNKNOWN_SERVICE) |
320 | return -1; | |
321 | ||
322 | /* Gotta do something different here, use global lock for now... */ | |
323 | spin_lock_irqsave(&rtas.lock, s); | |
324 | rtas_args = &rtas.args; | |
325 | ||
326 | rtas_args->token = token; | |
327 | rtas_args->nargs = nargs; | |
328 | rtas_args->nret = nret; | |
329 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); | |
330 | va_start(list, outputs); | |
033ef338 | 331 | for (i = 0; i < nargs; ++i) |
1da177e4 | 332 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
1da177e4 LT |
333 | va_end(list); |
334 | ||
335 | for (i = 0; i < nret; ++i) | |
336 | rtas_args->rets[i] = 0; | |
337 | ||
1da177e4 | 338 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
339 | |
340 | /* A -1 return code indicates that the last command couldn't | |
341 | be completed due to a hardware error. */ | |
342 | if (rtas_args->rets[0] == -1) | |
033ef338 | 343 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
344 | |
345 | if (nret > 1 && outputs != NULL) | |
346 | for (i = 0; i < nret-1; ++i) | |
347 | outputs[i] = rtas_args->rets[i+1]; | |
348 | ret = (nret > 0)? rtas_args->rets[0]: 0; | |
349 | ||
1da177e4 LT |
350 | /* Gotta do something different here, use global lock for now... */ |
351 | spin_unlock_irqrestore(&rtas.lock, s); | |
352 | ||
353 | if (buff_copy) { | |
354 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
355 | if (mem_init_done) | |
356 | kfree(buff_copy); | |
357 | } | |
358 | return ret; | |
359 | } | |
360 | ||
361 | /* Given an RTAS status code of 990n compute the hinted delay of 10^n | |
362 | * (last digit) milliseconds. For now we bound at n=5 (100 sec). | |
363 | */ | |
033ef338 | 364 | unsigned int rtas_extended_busy_delay_time(int status) |
1da177e4 LT |
365 | { |
366 | int order = status - 9900; | |
367 | unsigned long ms; | |
368 | ||
369 | if (order < 0) | |
370 | order = 0; /* RTC depends on this for -2 clock busy */ | |
371 | else if (order > 5) | |
372 | order = 5; /* bound */ | |
373 | ||
374 | /* Use microseconds for reasonable accuracy */ | |
033ef338 | 375 | for (ms = 1; order > 0; order--) |
1da177e4 LT |
376 | ms *= 10; |
377 | ||
378 | return ms; | |
379 | } | |
380 | ||
381 | int rtas_error_rc(int rtas_rc) | |
382 | { | |
383 | int rc; | |
384 | ||
385 | switch (rtas_rc) { | |
386 | case -1: /* Hardware Error */ | |
387 | rc = -EIO; | |
388 | break; | |
389 | case -3: /* Bad indicator/domain/etc */ | |
390 | rc = -EINVAL; | |
391 | break; | |
392 | case -9000: /* Isolation error */ | |
393 | rc = -EFAULT; | |
394 | break; | |
395 | case -9001: /* Outstanding TCE/PTE */ | |
396 | rc = -EEXIST; | |
397 | break; | |
398 | case -9002: /* No usable slot */ | |
399 | rc = -ENODEV; | |
400 | break; | |
401 | default: | |
402 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
403 | __FUNCTION__, rtas_rc); | |
404 | rc = -ERANGE; | |
405 | break; | |
406 | } | |
407 | return rc; | |
408 | } | |
409 | ||
410 | int rtas_get_power_level(int powerdomain, int *level) | |
411 | { | |
412 | int token = rtas_token("get-power-level"); | |
413 | int rc; | |
414 | ||
415 | if (token == RTAS_UNKNOWN_SERVICE) | |
416 | return -ENOENT; | |
417 | ||
418 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
419 | udelay(1); | |
420 | ||
421 | if (rc < 0) | |
422 | return rtas_error_rc(rc); | |
423 | return rc; | |
424 | } | |
425 | ||
426 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
427 | { | |
428 | int token = rtas_token("set-power-level"); | |
429 | unsigned int wait_time; | |
430 | int rc; | |
431 | ||
432 | if (token == RTAS_UNKNOWN_SERVICE) | |
433 | return -ENOENT; | |
434 | ||
435 | while (1) { | |
436 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); | |
437 | if (rc == RTAS_BUSY) | |
438 | udelay(1); | |
439 | else if (rtas_is_extended_busy(rc)) { | |
440 | wait_time = rtas_extended_busy_delay_time(rc); | |
441 | udelay(wait_time * 1000); | |
442 | } else | |
443 | break; | |
444 | } | |
445 | ||
446 | if (rc < 0) | |
447 | return rtas_error_rc(rc); | |
448 | return rc; | |
449 | } | |
450 | ||
451 | int rtas_get_sensor(int sensor, int index, int *state) | |
452 | { | |
453 | int token = rtas_token("get-sensor-state"); | |
454 | unsigned int wait_time; | |
455 | int rc; | |
456 | ||
457 | if (token == RTAS_UNKNOWN_SERVICE) | |
458 | return -ENOENT; | |
459 | ||
460 | while (1) { | |
461 | rc = rtas_call(token, 2, 2, state, sensor, index); | |
462 | if (rc == RTAS_BUSY) | |
463 | udelay(1); | |
464 | else if (rtas_is_extended_busy(rc)) { | |
465 | wait_time = rtas_extended_busy_delay_time(rc); | |
466 | udelay(wait_time * 1000); | |
467 | } else | |
468 | break; | |
469 | } | |
470 | ||
471 | if (rc < 0) | |
472 | return rtas_error_rc(rc); | |
473 | return rc; | |
474 | } | |
475 | ||
476 | int rtas_set_indicator(int indicator, int index, int new_value) | |
477 | { | |
478 | int token = rtas_token("set-indicator"); | |
479 | unsigned int wait_time; | |
480 | int rc; | |
481 | ||
482 | if (token == RTAS_UNKNOWN_SERVICE) | |
483 | return -ENOENT; | |
484 | ||
485 | while (1) { | |
486 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
487 | if (rc == RTAS_BUSY) | |
488 | udelay(1); | |
489 | else if (rtas_is_extended_busy(rc)) { | |
490 | wait_time = rtas_extended_busy_delay_time(rc); | |
491 | udelay(wait_time * 1000); | |
492 | } | |
493 | else | |
494 | break; | |
495 | } | |
496 | ||
497 | if (rc < 0) | |
498 | return rtas_error_rc(rc); | |
499 | return rc; | |
500 | } | |
501 | ||
033ef338 | 502 | void rtas_restart(char *cmd) |
1da177e4 | 503 | { |
f4fcbbe9 PM |
504 | if (rtas_flash_term_hook) |
505 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
506 | printk("RTAS system-reboot returned %d\n", |
507 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
508 | for (;;); | |
509 | } | |
510 | ||
033ef338 | 511 | void rtas_power_off(void) |
1da177e4 | 512 | { |
f4fcbbe9 PM |
513 | if (rtas_flash_term_hook) |
514 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
515 | /* allow power on only with power button press */ |
516 | printk("RTAS power-off returned %d\n", | |
517 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
518 | for (;;); | |
519 | } | |
520 | ||
033ef338 | 521 | void rtas_halt(void) |
1da177e4 | 522 | { |
f4fcbbe9 PM |
523 | if (rtas_flash_term_hook) |
524 | rtas_flash_term_hook(SYS_HALT); | |
525 | /* allow power on only with power button press */ | |
526 | printk("RTAS power-off returned %d\n", | |
527 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
528 | for (;;); | |
1da177e4 LT |
529 | } |
530 | ||
531 | /* Must be in the RMO region, so we place it here */ | |
532 | static char rtas_os_term_buf[2048]; | |
533 | ||
534 | void rtas_os_term(char *str) | |
535 | { | |
536 | int status; | |
537 | ||
538 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term")) | |
539 | return; | |
540 | ||
541 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); | |
542 | ||
543 | do { | |
544 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
545 | __pa(rtas_os_term_buf)); | |
546 | ||
547 | if (status == RTAS_BUSY) | |
548 | udelay(1); | |
549 | else if (status != 0) | |
550 | printk(KERN_EMERG "ibm,os-term call failed %d\n", | |
551 | status); | |
552 | } while (status == RTAS_BUSY); | |
553 | } | |
554 | ||
555 | ||
556 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) | |
557 | { | |
558 | struct rtas_args args; | |
559 | unsigned long flags; | |
033ef338 | 560 | char *buff_copy, *errbuf = NULL; |
1da177e4 | 561 | int nargs; |
1da177e4 LT |
562 | |
563 | if (!capable(CAP_SYS_ADMIN)) | |
564 | return -EPERM; | |
565 | ||
566 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
567 | return -EFAULT; | |
568 | ||
569 | nargs = args.nargs; | |
570 | if (nargs > ARRAY_SIZE(args.args) | |
571 | || args.nret > ARRAY_SIZE(args.args) | |
572 | || nargs + args.nret > ARRAY_SIZE(args.args)) | |
573 | return -EINVAL; | |
574 | ||
575 | /* Copy in args. */ | |
576 | if (copy_from_user(args.args, uargs->args, | |
577 | nargs * sizeof(rtas_arg_t)) != 0) | |
578 | return -EFAULT; | |
579 | ||
033ef338 | 580 | buff_copy = get_errorlog_buffer(); |
1da177e4 LT |
581 | |
582 | spin_lock_irqsave(&rtas.lock, flags); | |
583 | ||
584 | rtas.args = args; | |
585 | enter_rtas(__pa(&rtas.args)); | |
586 | args = rtas.args; | |
587 | ||
588 | args.rets = &args.args[nargs]; | |
589 | ||
590 | /* A -1 return code indicates that the last command couldn't | |
591 | be completed due to a hardware error. */ | |
033ef338 PM |
592 | if (args.rets[0] == -1) |
593 | errbuf = __fetch_rtas_last_error(buff_copy); | |
1da177e4 LT |
594 | |
595 | spin_unlock_irqrestore(&rtas.lock, flags); | |
596 | ||
597 | if (buff_copy) { | |
033ef338 PM |
598 | if (errbuf) |
599 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
600 | kfree(buff_copy); |
601 | } | |
602 | ||
603 | /* Copy out args. */ | |
604 | if (copy_to_user(uargs->args + nargs, | |
605 | args.args + nargs, | |
606 | args.nret * sizeof(rtas_arg_t)) != 0) | |
607 | return -EFAULT; | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | /* This version can't take the spinlock, because it never returns */ | |
613 | ||
614 | struct rtas_args rtas_stop_self_args = { | |
615 | /* The token is initialized for real in setup_system() */ | |
616 | .token = RTAS_UNKNOWN_SERVICE, | |
617 | .nargs = 0, | |
618 | .nret = 1, | |
619 | .rets = &rtas_stop_self_args.args[0], | |
620 | }; | |
621 | ||
622 | void rtas_stop_self(void) | |
623 | { | |
624 | struct rtas_args *rtas_args = &rtas_stop_self_args; | |
625 | ||
626 | local_irq_disable(); | |
627 | ||
628 | BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE); | |
629 | ||
630 | printk("cpu %u (hwid %u) Ready to die...\n", | |
631 | smp_processor_id(), hard_smp_processor_id()); | |
632 | enter_rtas(__pa(rtas_args)); | |
633 | ||
634 | panic("Alas, I survived.\n"); | |
635 | } | |
636 | ||
637 | /* | |
638 | * Call early during boot, before mem init or bootmem, to retreive the RTAS | |
639 | * informations from the device-tree and allocate the RMO buffer for userland | |
640 | * accesses. | |
641 | */ | |
642 | void __init rtas_initialize(void) | |
643 | { | |
033ef338 PM |
644 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
645 | ||
1da177e4 LT |
646 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
647 | * about it. | |
648 | */ | |
649 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
650 | if (rtas.dev) { | |
651 | u32 *basep, *entryp; | |
652 | u32 *sizep; | |
653 | ||
654 | basep = (u32 *)get_property(rtas.dev, "linux,rtas-base", NULL); | |
655 | sizep = (u32 *)get_property(rtas.dev, "rtas-size", NULL); | |
656 | if (basep != NULL && sizep != NULL) { | |
657 | rtas.base = *basep; | |
658 | rtas.size = *sizep; | |
659 | entryp = (u32 *)get_property(rtas.dev, "linux,rtas-entry", NULL); | |
660 | if (entryp == NULL) /* Ugh */ | |
661 | rtas.entry = rtas.base; | |
662 | else | |
663 | rtas.entry = *entryp; | |
664 | } else | |
665 | rtas.dev = NULL; | |
666 | } | |
033ef338 PM |
667 | if (!rtas.dev) |
668 | return; | |
669 | ||
1da177e4 LT |
670 | /* If RTAS was found, allocate the RMO buffer for it and look for |
671 | * the stop-self token if any | |
672 | */ | |
033ef338 PM |
673 | #ifdef CONFIG_PPC64 |
674 | if (systemcfg->platform == PLATFORM_PSERIES_LPAR) | |
675 | rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX); | |
676 | #endif | |
677 | rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); | |
1da177e4 LT |
678 | |
679 | #ifdef CONFIG_HOTPLUG_CPU | |
033ef338 | 680 | rtas_stop_self_args.token = rtas_token("stop-self"); |
1da177e4 | 681 | #endif /* CONFIG_HOTPLUG_CPU */ |
033ef338 PM |
682 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
683 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
684 | #endif | |
1da177e4 LT |
685 | } |
686 | ||
687 | ||
1da177e4 LT |
688 | EXPORT_SYMBOL(rtas_token); |
689 | EXPORT_SYMBOL(rtas_call); | |
690 | EXPORT_SYMBOL(rtas_data_buf); | |
691 | EXPORT_SYMBOL(rtas_data_buf_lock); | |
692 | EXPORT_SYMBOL(rtas_extended_busy_delay_time); | |
693 | EXPORT_SYMBOL(rtas_get_sensor); | |
694 | EXPORT_SYMBOL(rtas_get_power_level); | |
695 | EXPORT_SYMBOL(rtas_set_power_level); | |
696 | EXPORT_SYMBOL(rtas_set_indicator); |