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> | |
a9415644 | 20 | #include <linux/capability.h> |
21fe3301 | 21 | #include <linux/delay.h> |
1da177e4 LT |
22 | |
23 | #include <asm/prom.h> | |
24 | #include <asm/rtas.h> | |
25 | #include <asm/semaphore.h> | |
26 | #include <asm/machdep.h> | |
27 | #include <asm/page.h> | |
28 | #include <asm/param.h> | |
29 | #include <asm/system.h> | |
1da177e4 LT |
30 | #include <asm/delay.h> |
31 | #include <asm/uaccess.h> | |
033ef338 | 32 | #include <asm/lmb.h> |
296167ae | 33 | #include <asm/udbg.h> |
1da177e4 | 34 | |
033ef338 | 35 | struct rtas_t rtas = { |
1da177e4 LT |
36 | .lock = SPIN_LOCK_UNLOCKED |
37 | }; | |
38 | ||
39 | EXPORT_SYMBOL(rtas); | |
40 | ||
1da177e4 | 41 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
033ef338 | 42 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
1da177e4 LT |
43 | unsigned long rtas_rmo_buf; |
44 | ||
f4fcbbe9 PM |
45 | /* |
46 | * If non-NULL, this gets called when the kernel terminates. | |
47 | * This is done like this so rtas_flash can be a module. | |
48 | */ | |
49 | void (*rtas_flash_term_hook)(int); | |
50 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
51 | ||
033ef338 PM |
52 | /* |
53 | * call_rtas_display_status and call_rtas_display_status_delay | |
54 | * are designed only for very early low-level debugging, which | |
55 | * is why the token is hard-coded to 10. | |
56 | */ | |
296167ae | 57 | static void call_rtas_display_status(char c) |
1da177e4 LT |
58 | { |
59 | struct rtas_args *args = &rtas.args; | |
60 | unsigned long s; | |
61 | ||
62 | if (!rtas.base) | |
63 | return; | |
64 | spin_lock_irqsave(&rtas.lock, s); | |
65 | ||
66 | args->token = 10; | |
67 | args->nargs = 1; | |
68 | args->nret = 1; | |
69 | args->rets = (rtas_arg_t *)&(args->args[1]); | |
296167ae | 70 | args->args[0] = (unsigned char)c; |
1da177e4 LT |
71 | |
72 | enter_rtas(__pa(args)); | |
73 | ||
74 | spin_unlock_irqrestore(&rtas.lock, s); | |
75 | } | |
76 | ||
296167ae | 77 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
78 | { |
79 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
80 | static int width = 16; | |
81 | ||
82 | if (c == '\n') { | |
83 | while (width-- > 0) | |
84 | call_rtas_display_status(' '); | |
85 | width = 16; | |
21fe3301 | 86 | mdelay(500); |
1da177e4 LT |
87 | pending_newline = 1; |
88 | } else { | |
89 | if (pending_newline) { | |
90 | call_rtas_display_status('\r'); | |
91 | call_rtas_display_status('\n'); | |
92 | } | |
93 | pending_newline = 0; | |
94 | if (width--) { | |
95 | call_rtas_display_status(c); | |
96 | udelay(10000); | |
97 | } | |
98 | } | |
99 | } | |
100 | ||
296167ae ME |
101 | void __init udbg_init_rtas(void) |
102 | { | |
103 | udbg_putc = call_rtas_display_status_delay; | |
104 | } | |
105 | ||
033ef338 | 106 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
107 | { |
108 | struct device_node *root; | |
109 | int width, *p; | |
110 | char *os; | |
111 | static int display_character, set_indicator; | |
8f586b22 | 112 | static int display_width, display_lines, *row_width, form_feed; |
6566c6f1 | 113 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 114 | static int current_line; |
6566c6f1 AB |
115 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
116 | ||
117 | if (!rtas.base) | |
118 | return; | |
119 | ||
8f586b22 MS |
120 | if (display_width == 0) { |
121 | display_width = 0x10; | |
122 | if ((root = find_path_device("/rtas"))) { | |
123 | if ((p = (unsigned int *)get_property(root, | |
124 | "ibm,display-line-length", NULL))) | |
125 | display_width = *p; | |
126 | if ((p = (unsigned int *)get_property(root, | |
127 | "ibm,form-feed", NULL))) | |
128 | form_feed = *p; | |
129 | if ((p = (unsigned int *)get_property(root, | |
130 | "ibm,display-number-of-lines", NULL))) | |
131 | display_lines = *p; | |
132 | row_width = (unsigned int *)get_property(root, | |
133 | "ibm,display-truncation-length", NULL); | |
134 | } | |
6566c6f1 AB |
135 | display_character = rtas_token("display-character"); |
136 | set_indicator = rtas_token("set-indicator"); | |
137 | } | |
138 | ||
139 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
140 | /* use hex display if available */ | |
141 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
142 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
143 | return; | |
144 | } | |
145 | ||
146 | spin_lock(&progress_lock); | |
147 | ||
148 | /* | |
149 | * Last write ended with newline, but we didn't print it since | |
150 | * it would just clear the bottom line of output. Print it now | |
151 | * instead. | |
152 | * | |
8f586b22 MS |
153 | * If no newline is pending and form feed is supported, clear the |
154 | * display with a form feed; otherwise, print a CR to start output | |
155 | * at the beginning of the line. | |
6566c6f1 AB |
156 | */ |
157 | if (pending_newline) { | |
158 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
159 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
160 | pending_newline = 0; | |
161 | } else { | |
8f586b22 MS |
162 | current_line = 0; |
163 | if (form_feed) | |
164 | rtas_call(display_character, 1, 1, NULL, | |
165 | (char)form_feed); | |
166 | else | |
167 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
168 | } |
169 | ||
8f586b22 MS |
170 | if (row_width) |
171 | width = row_width[current_line]; | |
172 | else | |
173 | width = display_width; | |
6566c6f1 AB |
174 | os = s; |
175 | while (*os) { | |
176 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
177 | /* If newline is the last character, save it |
178 | * until next call to avoid bumping up the | |
179 | * display output. | |
180 | */ | |
181 | if (*os == '\n' && !os[1]) { | |
182 | pending_newline = 1; | |
8f586b22 MS |
183 | current_line++; |
184 | if (current_line > display_lines-1) | |
185 | current_line = display_lines-1; | |
6566c6f1 AB |
186 | spin_unlock(&progress_lock); |
187 | return; | |
188 | } | |
189 | ||
190 | /* RTAS wants CR-LF, not just LF */ | |
191 | ||
192 | if (*os == '\n') { | |
193 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
194 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
195 | } else { | |
196 | /* CR might be used to re-draw a line, so we'll | |
197 | * leave it alone and not add LF. | |
198 | */ | |
199 | rtas_call(display_character, 1, 1, NULL, *os); | |
200 | } | |
201 | ||
8f586b22 MS |
202 | if (row_width) |
203 | width = row_width[current_line]; | |
204 | else | |
205 | width = display_width; | |
6566c6f1 AB |
206 | } else { |
207 | width--; | |
208 | rtas_call(display_character, 1, 1, NULL, *os); | |
209 | } | |
210 | ||
211 | os++; | |
212 | ||
213 | /* if we overwrite the screen length */ | |
214 | if (width <= 0) | |
215 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
216 | os++; | |
217 | } | |
218 | ||
6566c6f1 AB |
219 | spin_unlock(&progress_lock); |
220 | } | |
f4fcbbe9 | 221 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 222 | |
033ef338 | 223 | int rtas_token(const char *service) |
1da177e4 LT |
224 | { |
225 | int *tokp; | |
033ef338 | 226 | if (rtas.dev == NULL) |
1da177e4 | 227 | return RTAS_UNKNOWN_SERVICE; |
1da177e4 LT |
228 | tokp = (int *) get_property(rtas.dev, service, NULL); |
229 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; | |
230 | } | |
231 | ||
033ef338 | 232 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
233 | /* |
234 | * Return the firmware-specified size of the error log buffer | |
235 | * for all rtas calls that require an error buffer argument. | |
236 | * This includes 'check-exception' and 'rtas-last-error'. | |
237 | */ | |
238 | int rtas_get_error_log_max(void) | |
239 | { | |
240 | static int rtas_error_log_max; | |
241 | if (rtas_error_log_max) | |
242 | return rtas_error_log_max; | |
243 | ||
244 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
245 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
246 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
247 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
248 | rtas_error_log_max); | |
1da177e4 LT |
249 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
250 | } | |
251 | return rtas_error_log_max; | |
252 | } | |
033ef338 | 253 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
254 | |
255 | ||
033ef338 PM |
256 | char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
257 | int rtas_last_error_token; | |
258 | ||
1da177e4 LT |
259 | /** Return a copy of the detailed error text associated with the |
260 | * most recent failed call to rtas. Because the error text | |
261 | * might go stale if there are any other intervening rtas calls, | |
262 | * this routine must be called atomically with whatever produced | |
263 | * the error (i.e. with rtas.lock still held from the previous call). | |
264 | */ | |
033ef338 | 265 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
266 | { |
267 | struct rtas_args err_args, save_args; | |
268 | u32 bufsz; | |
033ef338 PM |
269 | char *buf = NULL; |
270 | ||
271 | if (rtas_last_error_token == -1) | |
272 | return NULL; | |
1da177e4 LT |
273 | |
274 | bufsz = rtas_get_error_log_max(); | |
275 | ||
033ef338 | 276 | err_args.token = rtas_last_error_token; |
1da177e4 LT |
277 | err_args.nargs = 2; |
278 | err_args.nret = 1; | |
1da177e4 LT |
279 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
280 | err_args.args[1] = bufsz; | |
281 | err_args.args[2] = 0; | |
282 | ||
283 | save_args = rtas.args; | |
284 | rtas.args = err_args; | |
285 | ||
286 | enter_rtas(__pa(&rtas.args)); | |
287 | ||
288 | err_args = rtas.args; | |
289 | rtas.args = save_args; | |
290 | ||
033ef338 PM |
291 | /* Log the error in the unlikely case that there was one. */ |
292 | if (unlikely(err_args.args[2] == 0)) { | |
293 | if (altbuf) { | |
294 | buf = altbuf; | |
295 | } else { | |
296 | buf = rtas_err_buf; | |
297 | if (mem_init_done) | |
298 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
299 | } | |
300 | if (buf) | |
301 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
302 | } | |
303 | ||
304 | return buf; | |
1da177e4 LT |
305 | } |
306 | ||
033ef338 PM |
307 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
308 | ||
309 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
310 | #define __fetch_rtas_last_error(x) NULL | |
311 | #define get_errorlog_buffer() NULL | |
312 | #endif | |
313 | ||
1da177e4 LT |
314 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
315 | { | |
316 | va_list list; | |
033ef338 | 317 | int i; |
1da177e4 LT |
318 | unsigned long s; |
319 | struct rtas_args *rtas_args; | |
033ef338 | 320 | char *buff_copy = NULL; |
1da177e4 LT |
321 | int ret; |
322 | ||
1da177e4 LT |
323 | if (token == RTAS_UNKNOWN_SERVICE) |
324 | return -1; | |
325 | ||
326 | /* Gotta do something different here, use global lock for now... */ | |
327 | spin_lock_irqsave(&rtas.lock, s); | |
328 | rtas_args = &rtas.args; | |
329 | ||
330 | rtas_args->token = token; | |
331 | rtas_args->nargs = nargs; | |
332 | rtas_args->nret = nret; | |
333 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); | |
334 | va_start(list, outputs); | |
033ef338 | 335 | for (i = 0; i < nargs; ++i) |
1da177e4 | 336 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
1da177e4 LT |
337 | va_end(list); |
338 | ||
339 | for (i = 0; i < nret; ++i) | |
340 | rtas_args->rets[i] = 0; | |
341 | ||
1da177e4 | 342 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
343 | |
344 | /* A -1 return code indicates that the last command couldn't | |
345 | be completed due to a hardware error. */ | |
346 | if (rtas_args->rets[0] == -1) | |
033ef338 | 347 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
348 | |
349 | if (nret > 1 && outputs != NULL) | |
350 | for (i = 0; i < nret-1; ++i) | |
351 | outputs[i] = rtas_args->rets[i+1]; | |
352 | ret = (nret > 0)? rtas_args->rets[0]: 0; | |
353 | ||
1da177e4 LT |
354 | /* Gotta do something different here, use global lock for now... */ |
355 | spin_unlock_irqrestore(&rtas.lock, s); | |
356 | ||
357 | if (buff_copy) { | |
358 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
359 | if (mem_init_done) | |
360 | kfree(buff_copy); | |
361 | } | |
362 | return ret; | |
363 | } | |
364 | ||
365 | /* Given an RTAS status code of 990n compute the hinted delay of 10^n | |
366 | * (last digit) milliseconds. For now we bound at n=5 (100 sec). | |
367 | */ | |
033ef338 | 368 | unsigned int rtas_extended_busy_delay_time(int status) |
1da177e4 LT |
369 | { |
370 | int order = status - 9900; | |
371 | unsigned long ms; | |
372 | ||
373 | if (order < 0) | |
374 | order = 0; /* RTC depends on this for -2 clock busy */ | |
375 | else if (order > 5) | |
376 | order = 5; /* bound */ | |
377 | ||
378 | /* Use microseconds for reasonable accuracy */ | |
033ef338 | 379 | for (ms = 1; order > 0; order--) |
1da177e4 LT |
380 | ms *= 10; |
381 | ||
382 | return ms; | |
383 | } | |
384 | ||
385 | int rtas_error_rc(int rtas_rc) | |
386 | { | |
387 | int rc; | |
388 | ||
389 | switch (rtas_rc) { | |
390 | case -1: /* Hardware Error */ | |
391 | rc = -EIO; | |
392 | break; | |
393 | case -3: /* Bad indicator/domain/etc */ | |
394 | rc = -EINVAL; | |
395 | break; | |
396 | case -9000: /* Isolation error */ | |
397 | rc = -EFAULT; | |
398 | break; | |
399 | case -9001: /* Outstanding TCE/PTE */ | |
400 | rc = -EEXIST; | |
401 | break; | |
402 | case -9002: /* No usable slot */ | |
403 | rc = -ENODEV; | |
404 | break; | |
405 | default: | |
406 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
407 | __FUNCTION__, rtas_rc); | |
408 | rc = -ERANGE; | |
409 | break; | |
410 | } | |
411 | return rc; | |
412 | } | |
413 | ||
414 | int rtas_get_power_level(int powerdomain, int *level) | |
415 | { | |
416 | int token = rtas_token("get-power-level"); | |
417 | int rc; | |
418 | ||
419 | if (token == RTAS_UNKNOWN_SERVICE) | |
420 | return -ENOENT; | |
421 | ||
422 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
423 | udelay(1); | |
424 | ||
425 | if (rc < 0) | |
426 | return rtas_error_rc(rc); | |
427 | return rc; | |
428 | } | |
429 | ||
430 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
431 | { | |
432 | int token = rtas_token("set-power-level"); | |
433 | unsigned int wait_time; | |
434 | int rc; | |
435 | ||
436 | if (token == RTAS_UNKNOWN_SERVICE) | |
437 | return -ENOENT; | |
438 | ||
439 | while (1) { | |
440 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); | |
441 | if (rc == RTAS_BUSY) | |
442 | udelay(1); | |
443 | else if (rtas_is_extended_busy(rc)) { | |
444 | wait_time = rtas_extended_busy_delay_time(rc); | |
445 | udelay(wait_time * 1000); | |
446 | } else | |
447 | break; | |
448 | } | |
449 | ||
450 | if (rc < 0) | |
451 | return rtas_error_rc(rc); | |
452 | return rc; | |
453 | } | |
454 | ||
455 | int rtas_get_sensor(int sensor, int index, int *state) | |
456 | { | |
457 | int token = rtas_token("get-sensor-state"); | |
458 | unsigned int wait_time; | |
459 | int rc; | |
460 | ||
461 | if (token == RTAS_UNKNOWN_SERVICE) | |
462 | return -ENOENT; | |
463 | ||
464 | while (1) { | |
465 | rc = rtas_call(token, 2, 2, state, sensor, index); | |
466 | if (rc == RTAS_BUSY) | |
467 | udelay(1); | |
468 | else if (rtas_is_extended_busy(rc)) { | |
469 | wait_time = rtas_extended_busy_delay_time(rc); | |
470 | udelay(wait_time * 1000); | |
471 | } else | |
472 | break; | |
473 | } | |
474 | ||
475 | if (rc < 0) | |
476 | return rtas_error_rc(rc); | |
477 | return rc; | |
478 | } | |
479 | ||
480 | int rtas_set_indicator(int indicator, int index, int new_value) | |
481 | { | |
482 | int token = rtas_token("set-indicator"); | |
483 | unsigned int wait_time; | |
484 | int rc; | |
485 | ||
486 | if (token == RTAS_UNKNOWN_SERVICE) | |
487 | return -ENOENT; | |
488 | ||
489 | while (1) { | |
490 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
491 | if (rc == RTAS_BUSY) | |
492 | udelay(1); | |
493 | else if (rtas_is_extended_busy(rc)) { | |
494 | wait_time = rtas_extended_busy_delay_time(rc); | |
495 | udelay(wait_time * 1000); | |
496 | } | |
497 | else | |
498 | break; | |
499 | } | |
500 | ||
501 | if (rc < 0) | |
502 | return rtas_error_rc(rc); | |
503 | return rc; | |
504 | } | |
505 | ||
033ef338 | 506 | void rtas_restart(char *cmd) |
1da177e4 | 507 | { |
f4fcbbe9 PM |
508 | if (rtas_flash_term_hook) |
509 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
510 | printk("RTAS system-reboot returned %d\n", |
511 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
512 | for (;;); | |
513 | } | |
514 | ||
033ef338 | 515 | void rtas_power_off(void) |
1da177e4 | 516 | { |
f4fcbbe9 PM |
517 | if (rtas_flash_term_hook) |
518 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
519 | /* allow power on only with power button press */ |
520 | printk("RTAS power-off returned %d\n", | |
521 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
522 | for (;;); | |
523 | } | |
524 | ||
033ef338 | 525 | void rtas_halt(void) |
1da177e4 | 526 | { |
f4fcbbe9 PM |
527 | if (rtas_flash_term_hook) |
528 | rtas_flash_term_hook(SYS_HALT); | |
529 | /* allow power on only with power button press */ | |
530 | printk("RTAS power-off returned %d\n", | |
531 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
532 | for (;;); | |
1da177e4 LT |
533 | } |
534 | ||
535 | /* Must be in the RMO region, so we place it here */ | |
536 | static char rtas_os_term_buf[2048]; | |
537 | ||
538 | void rtas_os_term(char *str) | |
539 | { | |
540 | int status; | |
541 | ||
542 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term")) | |
543 | return; | |
544 | ||
545 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); | |
546 | ||
547 | do { | |
548 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
549 | __pa(rtas_os_term_buf)); | |
550 | ||
551 | if (status == RTAS_BUSY) | |
552 | udelay(1); | |
553 | else if (status != 0) | |
554 | printk(KERN_EMERG "ibm,os-term call failed %d\n", | |
555 | status); | |
556 | } while (status == RTAS_BUSY); | |
557 | } | |
558 | ||
559 | ||
560 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) | |
561 | { | |
562 | struct rtas_args args; | |
563 | unsigned long flags; | |
033ef338 | 564 | char *buff_copy, *errbuf = NULL; |
1da177e4 | 565 | int nargs; |
1da177e4 LT |
566 | |
567 | if (!capable(CAP_SYS_ADMIN)) | |
568 | return -EPERM; | |
569 | ||
570 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
571 | return -EFAULT; | |
572 | ||
573 | nargs = args.nargs; | |
574 | if (nargs > ARRAY_SIZE(args.args) | |
575 | || args.nret > ARRAY_SIZE(args.args) | |
576 | || nargs + args.nret > ARRAY_SIZE(args.args)) | |
577 | return -EINVAL; | |
578 | ||
579 | /* Copy in args. */ | |
580 | if (copy_from_user(args.args, uargs->args, | |
581 | nargs * sizeof(rtas_arg_t)) != 0) | |
582 | return -EFAULT; | |
583 | ||
033ef338 | 584 | buff_copy = get_errorlog_buffer(); |
1da177e4 LT |
585 | |
586 | spin_lock_irqsave(&rtas.lock, flags); | |
587 | ||
588 | rtas.args = args; | |
589 | enter_rtas(__pa(&rtas.args)); | |
590 | args = rtas.args; | |
591 | ||
592 | args.rets = &args.args[nargs]; | |
593 | ||
594 | /* A -1 return code indicates that the last command couldn't | |
595 | be completed due to a hardware error. */ | |
033ef338 PM |
596 | if (args.rets[0] == -1) |
597 | errbuf = __fetch_rtas_last_error(buff_copy); | |
1da177e4 LT |
598 | |
599 | spin_unlock_irqrestore(&rtas.lock, flags); | |
600 | ||
601 | if (buff_copy) { | |
033ef338 PM |
602 | if (errbuf) |
603 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
604 | kfree(buff_copy); |
605 | } | |
606 | ||
607 | /* Copy out args. */ | |
608 | if (copy_to_user(uargs->args + nargs, | |
609 | args.args + nargs, | |
610 | args.nret * sizeof(rtas_arg_t)) != 0) | |
611 | return -EFAULT; | |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
616 | /* This version can't take the spinlock, because it never returns */ | |
617 | ||
618 | struct rtas_args rtas_stop_self_args = { | |
619 | /* The token is initialized for real in setup_system() */ | |
620 | .token = RTAS_UNKNOWN_SERVICE, | |
621 | .nargs = 0, | |
622 | .nret = 1, | |
623 | .rets = &rtas_stop_self_args.args[0], | |
624 | }; | |
625 | ||
626 | void rtas_stop_self(void) | |
627 | { | |
628 | struct rtas_args *rtas_args = &rtas_stop_self_args; | |
629 | ||
630 | local_irq_disable(); | |
631 | ||
632 | BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE); | |
633 | ||
634 | printk("cpu %u (hwid %u) Ready to die...\n", | |
635 | smp_processor_id(), hard_smp_processor_id()); | |
636 | enter_rtas(__pa(rtas_args)); | |
637 | ||
638 | panic("Alas, I survived.\n"); | |
639 | } | |
640 | ||
641 | /* | |
943ffb58 | 642 | * Call early during boot, before mem init or bootmem, to retrieve the RTAS |
1da177e4 LT |
643 | * informations from the device-tree and allocate the RMO buffer for userland |
644 | * accesses. | |
645 | */ | |
646 | void __init rtas_initialize(void) | |
647 | { | |
033ef338 PM |
648 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
649 | ||
1da177e4 LT |
650 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
651 | * about it. | |
652 | */ | |
653 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
654 | if (rtas.dev) { | |
655 | u32 *basep, *entryp; | |
656 | u32 *sizep; | |
657 | ||
658 | basep = (u32 *)get_property(rtas.dev, "linux,rtas-base", NULL); | |
659 | sizep = (u32 *)get_property(rtas.dev, "rtas-size", NULL); | |
660 | if (basep != NULL && sizep != NULL) { | |
661 | rtas.base = *basep; | |
662 | rtas.size = *sizep; | |
663 | entryp = (u32 *)get_property(rtas.dev, "linux,rtas-entry", NULL); | |
664 | if (entryp == NULL) /* Ugh */ | |
665 | rtas.entry = rtas.base; | |
666 | else | |
667 | rtas.entry = *entryp; | |
668 | } else | |
669 | rtas.dev = NULL; | |
670 | } | |
033ef338 PM |
671 | if (!rtas.dev) |
672 | return; | |
673 | ||
1da177e4 LT |
674 | /* If RTAS was found, allocate the RMO buffer for it and look for |
675 | * the stop-self token if any | |
676 | */ | |
033ef338 | 677 | #ifdef CONFIG_PPC64 |
799d6046 | 678 | if (_machine == PLATFORM_PSERIES_LPAR) |
033ef338 PM |
679 | rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX); |
680 | #endif | |
681 | rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); | |
1da177e4 LT |
682 | |
683 | #ifdef CONFIG_HOTPLUG_CPU | |
033ef338 | 684 | rtas_stop_self_args.token = rtas_token("stop-self"); |
1da177e4 | 685 | #endif /* CONFIG_HOTPLUG_CPU */ |
033ef338 PM |
686 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
687 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
688 | #endif | |
1da177e4 LT |
689 | } |
690 | ||
691 | ||
1da177e4 LT |
692 | EXPORT_SYMBOL(rtas_token); |
693 | EXPORT_SYMBOL(rtas_call); | |
694 | EXPORT_SYMBOL(rtas_data_buf); | |
695 | EXPORT_SYMBOL(rtas_data_buf_lock); | |
696 | EXPORT_SYMBOL(rtas_extended_busy_delay_time); | |
697 | EXPORT_SYMBOL(rtas_get_sensor); | |
698 | EXPORT_SYMBOL(rtas_get_power_level); | |
699 | EXPORT_SYMBOL(rtas_set_power_level); | |
700 | EXPORT_SYMBOL(rtas_set_indicator); |