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1da177e4 LT |
1 | /* -*- linux-c -*- |
2 | * | |
3 | * drivers/char/viocons.c | |
4 | * | |
5 | * iSeries Virtual Terminal | |
6 | * | |
7 | * Authors: Dave Boutcher <boutcher@us.ibm.com> | |
8 | * Ryan Arnold <ryanarn@us.ibm.com> | |
9 | * Colin Devilbiss <devilbis@us.ibm.com> | |
10 | * Stephen Rothwell <sfr@au1.ibm.com> | |
11 | * | |
12 | * (C) Copyright 2000, 2001, 2002, 2003, 2004 IBM Corporation | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of the | |
17 | * License, or (at your option) anyu later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, but | |
20 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
22 | * General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software Foundation, | |
26 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
27 | */ | |
1da177e4 LT |
28 | #include <linux/kernel.h> |
29 | #include <linux/proc_fs.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/vmalloc.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/console.h> | |
34 | #include <linux/module.h> | |
35 | #include <asm/uaccess.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/wait.h> | |
38 | #include <linux/spinlock.h> | |
39 | #include <asm/ioctls.h> | |
40 | #include <linux/kd.h> | |
41 | #include <linux/tty.h> | |
42 | #include <linux/tty_flip.h> | |
43 | #include <linux/sysrq.h> | |
44 | ||
94c8f9f9 | 45 | #include <asm/firmware.h> |
b4206778 | 46 | #include <asm/iseries/vio.h> |
e45423ea | 47 | #include <asm/iseries/hv_lp_event.h> |
c0a8d05c | 48 | #include <asm/iseries/hv_call_event.h> |
15b17189 | 49 | #include <asm/iseries/hv_lp_config.h> |
1da44037 | 50 | #include <asm/iseries/hv_call.h> |
1da177e4 LT |
51 | |
52 | #ifdef CONFIG_VT | |
53 | #error You must turn off CONFIG_VT to use CONFIG_VIOCONS | |
54 | #endif | |
55 | ||
56 | #define VIOTTY_MAGIC (0x0DCB) | |
57 | #define VTTY_PORTS 10 | |
58 | ||
59 | #define VIOCONS_KERN_WARN KERN_WARNING "viocons: " | |
60 | #define VIOCONS_KERN_INFO KERN_INFO "viocons: " | |
61 | ||
62 | static DEFINE_SPINLOCK(consolelock); | |
63 | static DEFINE_SPINLOCK(consoleloglock); | |
64 | ||
1da177e4 | 65 | static int vio_sysrq_pressed; |
1da177e4 | 66 | |
1da177e4 LT |
67 | #define VIOCHAR_NUM_BUF 16 |
68 | ||
69 | /* | |
70 | * Our port information. We store a pointer to one entry in the | |
71 | * tty_driver_data | |
72 | */ | |
73 | static struct port_info { | |
74 | int magic; | |
75 | struct tty_struct *tty; | |
76 | HvLpIndex lp; | |
77 | u8 vcons; | |
78 | u64 seq; /* sequence number of last HV send */ | |
79 | u64 ack; /* last ack from HV */ | |
80 | /* | |
81 | * When we get writes faster than we can send it to the partition, | |
82 | * buffer the data here. Note that used is a bit map of used buffers. | |
83 | * It had better have enough bits to hold VIOCHAR_NUM_BUF the bitops assume | |
84 | * it is a multiple of unsigned long | |
85 | */ | |
86 | unsigned long used; | |
87 | u8 *buffer[VIOCHAR_NUM_BUF]; | |
88 | int bufferBytes[VIOCHAR_NUM_BUF]; | |
89 | int curbuf; | |
90 | int bufferOverflow; | |
91 | int overflowMessage; | |
92 | } port_info[VTTY_PORTS]; | |
93 | ||
94 | #define viochar_is_console(pi) ((pi) == &port_info[0]) | |
95 | #define viochar_port(pi) ((pi) - &port_info[0]) | |
96 | ||
97 | static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp); | |
98 | ||
99 | static struct tty_driver *viotty_driver; | |
100 | ||
bf6a7112 | 101 | static void hvlog(char *fmt, ...) |
1da177e4 LT |
102 | { |
103 | int i; | |
104 | unsigned long flags; | |
105 | va_list args; | |
106 | static char buf[256]; | |
107 | ||
108 | spin_lock_irqsave(&consoleloglock, flags); | |
109 | va_start(args, fmt); | |
110 | i = vscnprintf(buf, sizeof(buf) - 1, fmt, args); | |
111 | va_end(args); | |
112 | buf[i++] = '\r'; | |
113 | HvCall_writeLogBuffer(buf, i); | |
114 | spin_unlock_irqrestore(&consoleloglock, flags); | |
115 | } | |
116 | ||
bf6a7112 | 117 | static void hvlogOutput(const char *buf, int count) |
1da177e4 LT |
118 | { |
119 | unsigned long flags; | |
120 | int begin; | |
121 | int index; | |
122 | static const char cr = '\r'; | |
123 | ||
124 | begin = 0; | |
125 | spin_lock_irqsave(&consoleloglock, flags); | |
126 | for (index = 0; index < count; index++) { | |
127 | if (buf[index] == '\n') { | |
128 | /* | |
129 | * Start right after the last '\n' or at the zeroth | |
130 | * array position and output the number of characters | |
131 | * including the newline. | |
132 | */ | |
133 | HvCall_writeLogBuffer(&buf[begin], index - begin + 1); | |
134 | begin = index + 1; | |
135 | HvCall_writeLogBuffer(&cr, 1); | |
136 | } | |
137 | } | |
138 | if ((index - begin) > 0) | |
139 | HvCall_writeLogBuffer(&buf[begin], index - begin); | |
140 | spin_unlock_irqrestore(&consoleloglock, flags); | |
141 | } | |
142 | ||
143 | /* | |
144 | * Make sure we're pointing to a valid port_info structure. Shamelessly | |
145 | * plagerized from serial.c | |
146 | */ | |
147 | static inline int viotty_paranoia_check(struct port_info *pi, | |
148 | char *name, const char *routine) | |
149 | { | |
150 | static const char *bad_pi_addr = VIOCONS_KERN_WARN | |
151 | "warning: bad address for port_info struct (%s) in %s\n"; | |
152 | static const char *badmagic = VIOCONS_KERN_WARN | |
153 | "warning: bad magic number for port_info struct (%s) in %s\n"; | |
154 | ||
155 | if ((pi < &port_info[0]) || (viochar_port(pi) > VTTY_PORTS)) { | |
156 | printk(bad_pi_addr, name, routine); | |
157 | return 1; | |
158 | } | |
159 | if (pi->magic != VIOTTY_MAGIC) { | |
160 | printk(badmagic, name, routine); | |
161 | return 1; | |
162 | } | |
163 | return 0; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Add data to our pending-send buffers. | |
168 | * | |
169 | * NOTE: Don't use printk in here because it gets nastily recursive. | |
170 | * hvlog can be used to log to the hypervisor buffer | |
171 | */ | |
172 | static int buffer_add(struct port_info *pi, const char *buf, size_t len) | |
173 | { | |
174 | size_t bleft; | |
175 | size_t curlen; | |
176 | const char *curbuf; | |
177 | int nextbuf; | |
178 | ||
179 | curbuf = buf; | |
180 | bleft = len; | |
181 | while (bleft > 0) { | |
182 | /* | |
183 | * If there is no space left in the current buffer, we have | |
184 | * filled everything up, so return. If we filled the previous | |
185 | * buffer we would already have moved to the next one. | |
186 | */ | |
187 | if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) { | |
188 | hvlog ("\n\rviocons: No overflow buffer available for memcpy().\n"); | |
189 | pi->bufferOverflow++; | |
190 | pi->overflowMessage = 1; | |
191 | break; | |
192 | } | |
193 | ||
194 | /* | |
195 | * Turn on the "used" bit for this buffer. If it's already on, | |
196 | * that's fine. | |
197 | */ | |
198 | set_bit(pi->curbuf, &pi->used); | |
199 | ||
200 | /* | |
201 | * See if this buffer has been allocated. If not, allocate it. | |
202 | */ | |
203 | if (pi->buffer[pi->curbuf] == NULL) { | |
204 | pi->buffer[pi->curbuf] = | |
205 | kmalloc(VIOCHAR_MAX_DATA, GFP_ATOMIC); | |
206 | if (pi->buffer[pi->curbuf] == NULL) { | |
207 | hvlog("\n\rviocons: kmalloc failed allocating spaces for buffer %d.", | |
208 | pi->curbuf); | |
209 | break; | |
210 | } | |
211 | } | |
212 | ||
213 | /* Figure out how much we can copy into this buffer. */ | |
214 | if (bleft < (VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf])) | |
215 | curlen = bleft; | |
216 | else | |
217 | curlen = VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf]; | |
218 | ||
219 | /* Copy the data into the buffer. */ | |
220 | memcpy(pi->buffer[pi->curbuf] + pi->bufferBytes[pi->curbuf], | |
221 | curbuf, curlen); | |
222 | ||
223 | pi->bufferBytes[pi->curbuf] += curlen; | |
224 | curbuf += curlen; | |
225 | bleft -= curlen; | |
226 | ||
227 | /* | |
228 | * Now see if we've filled this buffer. If not then | |
229 | * we'll try to use it again later. If we've filled it | |
230 | * up then we'll advance the curbuf to the next in the | |
231 | * circular queue. | |
232 | */ | |
233 | if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) { | |
234 | nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF; | |
235 | /* | |
236 | * Move to the next buffer if it hasn't been used yet | |
237 | */ | |
238 | if (test_bit(nextbuf, &pi->used) == 0) | |
239 | pi->curbuf = nextbuf; | |
240 | } | |
241 | } | |
242 | return len - bleft; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Send pending data | |
247 | * | |
248 | * NOTE: Don't use printk in here because it gets nastily recursive. | |
249 | * hvlog can be used to log to the hypervisor buffer | |
250 | */ | |
251 | static void send_buffers(struct port_info *pi) | |
252 | { | |
253 | HvLpEvent_Rc hvrc; | |
254 | int nextbuf; | |
255 | struct viocharlpevent *viochar; | |
256 | unsigned long flags; | |
257 | ||
258 | spin_lock_irqsave(&consolelock, flags); | |
259 | ||
260 | viochar = (struct viocharlpevent *) | |
261 | vio_get_event_buffer(viomajorsubtype_chario); | |
262 | ||
263 | /* Make sure we got a buffer */ | |
264 | if (viochar == NULL) { | |
265 | hvlog("\n\rviocons: Can't get viochar buffer in sendBuffers()."); | |
266 | spin_unlock_irqrestore(&consolelock, flags); | |
267 | return; | |
268 | } | |
269 | ||
270 | if (pi->used == 0) { | |
271 | hvlog("\n\rviocons: in sendbuffers(), but no buffers used.\n"); | |
272 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
273 | spin_unlock_irqrestore(&consolelock, flags); | |
274 | return; | |
275 | } | |
276 | ||
277 | /* | |
278 | * curbuf points to the buffer we're filling. We want to | |
279 | * start sending AFTER this one. | |
280 | */ | |
281 | nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF; | |
282 | ||
283 | /* | |
284 | * Loop until we find a buffer with the used bit on | |
285 | */ | |
286 | while (test_bit(nextbuf, &pi->used) == 0) | |
287 | nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF; | |
288 | ||
289 | initDataEvent(viochar, pi->lp); | |
290 | ||
291 | /* | |
292 | * While we have buffers with data, and our send window | |
293 | * is open, send them | |
294 | */ | |
295 | while ((test_bit(nextbuf, &pi->used)) && | |
296 | ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) { | |
297 | viochar->len = pi->bufferBytes[nextbuf]; | |
298 | viochar->event.xCorrelationToken = pi->seq++; | |
299 | viochar->event.xSizeMinus1 = | |
300 | offsetof(struct viocharlpevent, data) + viochar->len; | |
301 | ||
302 | memcpy(viochar->data, pi->buffer[nextbuf], viochar->len); | |
303 | ||
304 | hvrc = HvCallEvent_signalLpEvent(&viochar->event); | |
305 | if (hvrc) { | |
306 | /* | |
307 | * MUST unlock the spinlock before doing a printk | |
308 | */ | |
309 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
310 | spin_unlock_irqrestore(&consolelock, flags); | |
311 | ||
312 | printk(VIOCONS_KERN_WARN | |
313 | "error sending event! return code %d\n", | |
314 | (int)hvrc); | |
315 | return; | |
316 | } | |
317 | ||
318 | /* | |
319 | * clear the used bit, zero the number of bytes in | |
320 | * this buffer, and move to the next buffer | |
321 | */ | |
322 | clear_bit(nextbuf, &pi->used); | |
323 | pi->bufferBytes[nextbuf] = 0; | |
324 | nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF; | |
325 | } | |
326 | ||
327 | /* | |
328 | * If we have emptied all the buffers, start at 0 again. | |
329 | * this will re-use any allocated buffers | |
330 | */ | |
331 | if (pi->used == 0) { | |
332 | pi->curbuf = 0; | |
333 | ||
334 | if (pi->overflowMessage) | |
335 | pi->overflowMessage = 0; | |
336 | ||
337 | if (pi->tty) { | |
338 | tty_wakeup(pi->tty); | |
339 | } | |
340 | } | |
341 | ||
342 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
343 | spin_unlock_irqrestore(&consolelock, flags); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Our internal writer. Gets called both from the console device and | |
348 | * the tty device. the tty pointer will be NULL if called from the console. | |
349 | * Return total number of bytes "written". | |
350 | * | |
351 | * NOTE: Don't use printk in here because it gets nastily recursive. hvlog | |
352 | * can be used to log to the hypervisor buffer | |
353 | */ | |
354 | static int internal_write(struct port_info *pi, const char *buf, size_t len) | |
355 | { | |
356 | HvLpEvent_Rc hvrc; | |
357 | size_t bleft; | |
358 | size_t curlen; | |
359 | const char *curbuf; | |
360 | unsigned long flags; | |
361 | struct viocharlpevent *viochar; | |
362 | ||
363 | /* | |
364 | * Write to the hvlog of inbound data are now done prior to | |
365 | * calling internal_write() since internal_write() is only called in | |
366 | * the event that an lp event path is active, which isn't the case for | |
367 | * logging attempts prior to console initialization. | |
368 | * | |
369 | * If there is already data queued for this port, send it prior to | |
370 | * attempting to send any new data. | |
371 | */ | |
372 | if (pi->used) | |
373 | send_buffers(pi); | |
374 | ||
375 | spin_lock_irqsave(&consolelock, flags); | |
376 | ||
377 | viochar = vio_get_event_buffer(viomajorsubtype_chario); | |
378 | if (viochar == NULL) { | |
379 | spin_unlock_irqrestore(&consolelock, flags); | |
380 | hvlog("\n\rviocons: Can't get vio buffer in internal_write()."); | |
381 | return -EAGAIN; | |
382 | } | |
383 | initDataEvent(viochar, pi->lp); | |
384 | ||
385 | curbuf = buf; | |
386 | bleft = len; | |
387 | ||
388 | while ((bleft > 0) && (pi->used == 0) && | |
389 | ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) { | |
390 | if (bleft > VIOCHAR_MAX_DATA) | |
391 | curlen = VIOCHAR_MAX_DATA; | |
392 | else | |
393 | curlen = bleft; | |
394 | ||
395 | viochar->event.xCorrelationToken = pi->seq++; | |
396 | memcpy(viochar->data, curbuf, curlen); | |
397 | viochar->len = curlen; | |
398 | viochar->event.xSizeMinus1 = | |
399 | offsetof(struct viocharlpevent, data) + curlen; | |
400 | ||
401 | hvrc = HvCallEvent_signalLpEvent(&viochar->event); | |
402 | if (hvrc) { | |
403 | hvlog("viocons: error sending event! %d\n", (int)hvrc); | |
404 | goto out; | |
405 | } | |
406 | curbuf += curlen; | |
407 | bleft -= curlen; | |
408 | } | |
409 | ||
410 | /* If we didn't send it all, buffer as much of it as we can. */ | |
411 | if (bleft > 0) | |
412 | bleft -= buffer_add(pi, curbuf, bleft); | |
413 | out: | |
414 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
415 | spin_unlock_irqrestore(&consolelock, flags); | |
416 | return len - bleft; | |
417 | } | |
418 | ||
419 | static struct port_info *get_port_data(struct tty_struct *tty) | |
420 | { | |
421 | unsigned long flags; | |
422 | struct port_info *pi; | |
423 | ||
424 | spin_lock_irqsave(&consolelock, flags); | |
425 | if (tty) { | |
426 | pi = (struct port_info *)tty->driver_data; | |
427 | if (!pi || viotty_paranoia_check(pi, tty->name, | |
428 | "get_port_data")) { | |
429 | pi = NULL; | |
430 | } | |
431 | } else | |
432 | /* | |
433 | * If this is the console device, use the lp from | |
434 | * the first port entry | |
435 | */ | |
436 | pi = &port_info[0]; | |
437 | spin_unlock_irqrestore(&consolelock, flags); | |
438 | return pi; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Initialize the common fields in a charLpEvent | |
443 | */ | |
444 | static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp) | |
445 | { | |
677f8c0d SR |
446 | struct HvLpEvent *hev = &viochar->event; |
447 | ||
1da177e4 LT |
448 | memset(viochar, 0, sizeof(struct viocharlpevent)); |
449 | ||
677f8c0d SR |
450 | hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK | |
451 | HV_LP_EVENT_INT; | |
452 | hev->xType = HvLpEvent_Type_VirtualIo; | |
453 | hev->xSubtype = viomajorsubtype_chario | viochardata; | |
454 | hev->xSourceLp = HvLpConfig_getLpIndex(); | |
455 | hev->xTargetLp = lp; | |
456 | hev->xSizeMinus1 = sizeof(struct viocharlpevent); | |
457 | hev->xSourceInstanceId = viopath_sourceinst(lp); | |
458 | hev->xTargetInstanceId = viopath_targetinst(lp); | |
1da177e4 LT |
459 | } |
460 | ||
461 | /* | |
462 | * early console device write | |
463 | */ | |
464 | static void viocons_write_early(struct console *co, const char *s, unsigned count) | |
465 | { | |
466 | hvlogOutput(s, count); | |
467 | } | |
468 | ||
469 | /* | |
470 | * console device write | |
471 | */ | |
472 | static void viocons_write(struct console *co, const char *s, unsigned count) | |
473 | { | |
474 | int index; | |
475 | int begin; | |
476 | struct port_info *pi; | |
477 | ||
478 | static const char cr = '\r'; | |
479 | ||
480 | /* | |
481 | * Check port data first because the target LP might be valid but | |
482 | * simply not active, in which case we want to hvlog the output. | |
483 | */ | |
484 | pi = get_port_data(NULL); | |
485 | if (pi == NULL) { | |
486 | hvlog("\n\rviocons_write: unable to get port data."); | |
487 | return; | |
488 | } | |
489 | ||
490 | hvlogOutput(s, count); | |
491 | ||
492 | if (!viopath_isactive(pi->lp)) | |
493 | return; | |
494 | ||
495 | /* | |
496 | * Any newline character found will cause a | |
497 | * carriage return character to be emitted as well. | |
498 | */ | |
499 | begin = 0; | |
500 | for (index = 0; index < count; index++) { | |
501 | if (s[index] == '\n') { | |
502 | /* | |
503 | * Newline found. Print everything up to and | |
504 | * including the newline | |
505 | */ | |
506 | internal_write(pi, &s[begin], index - begin + 1); | |
507 | begin = index + 1; | |
508 | /* Emit a carriage return as well */ | |
509 | internal_write(pi, &cr, 1); | |
510 | } | |
511 | } | |
512 | ||
513 | /* If any characters left to write, write them now */ | |
514 | if ((index - begin) > 0) | |
515 | internal_write(pi, &s[begin], index - begin); | |
516 | } | |
517 | ||
518 | /* | |
519 | * Work out the device associate with this console | |
520 | */ | |
521 | static struct tty_driver *viocons_device(struct console *c, int *index) | |
522 | { | |
523 | *index = c->index; | |
524 | return viotty_driver; | |
525 | } | |
526 | ||
527 | /* | |
528 | * console device I/O methods | |
529 | */ | |
530 | static struct console viocons_early = { | |
531 | .name = "viocons", | |
532 | .write = viocons_write_early, | |
533 | .flags = CON_PRINTBUFFER, | |
534 | .index = -1, | |
535 | }; | |
536 | ||
537 | static struct console viocons = { | |
538 | .name = "viocons", | |
539 | .write = viocons_write, | |
540 | .device = viocons_device, | |
541 | .flags = CON_PRINTBUFFER, | |
542 | .index = -1, | |
543 | }; | |
544 | ||
545 | /* | |
546 | * TTY Open method | |
547 | */ | |
548 | static int viotty_open(struct tty_struct *tty, struct file *filp) | |
549 | { | |
550 | int port; | |
551 | unsigned long flags; | |
552 | struct port_info *pi; | |
553 | ||
554 | port = tty->index; | |
555 | ||
556 | if ((port < 0) || (port >= VTTY_PORTS)) | |
557 | return -ENODEV; | |
558 | ||
559 | spin_lock_irqsave(&consolelock, flags); | |
560 | ||
561 | pi = &port_info[port]; | |
562 | /* If some other TTY is already connected here, reject the open */ | |
563 | if ((pi->tty) && (pi->tty != tty)) { | |
564 | spin_unlock_irqrestore(&consolelock, flags); | |
565 | printk(VIOCONS_KERN_WARN | |
566 | "attempt to open device twice from different ttys\n"); | |
567 | return -EBUSY; | |
568 | } | |
569 | tty->driver_data = pi; | |
570 | pi->tty = tty; | |
571 | spin_unlock_irqrestore(&consolelock, flags); | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | /* | |
577 | * TTY Close method | |
578 | */ | |
579 | static void viotty_close(struct tty_struct *tty, struct file *filp) | |
580 | { | |
581 | unsigned long flags; | |
582 | struct port_info *pi; | |
583 | ||
584 | spin_lock_irqsave(&consolelock, flags); | |
585 | pi = (struct port_info *)tty->driver_data; | |
586 | ||
587 | if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_close")) { | |
588 | spin_unlock_irqrestore(&consolelock, flags); | |
589 | return; | |
590 | } | |
591 | if (tty->count == 1) | |
592 | pi->tty = NULL; | |
593 | spin_unlock_irqrestore(&consolelock, flags); | |
594 | } | |
595 | ||
596 | /* | |
597 | * TTY Write method | |
598 | */ | |
599 | static int viotty_write(struct tty_struct *tty, const unsigned char *buf, | |
600 | int count) | |
601 | { | |
602 | struct port_info *pi; | |
603 | ||
604 | pi = get_port_data(tty); | |
605 | if (pi == NULL) { | |
606 | hvlog("\n\rviotty_write: no port data."); | |
607 | return -ENODEV; | |
608 | } | |
609 | ||
610 | if (viochar_is_console(pi)) | |
611 | hvlogOutput(buf, count); | |
612 | ||
613 | /* | |
614 | * If the path to this LP is closed, don't bother doing anything more. | |
615 | * just dump the data on the floor and return count. For some reason | |
616 | * some user level programs will attempt to probe available tty's and | |
617 | * they'll attempt a viotty_write on an invalid port which maps to an | |
618 | * invalid target lp. If this is the case then ignore the | |
619 | * viotty_write call and, since the viopath isn't active to this | |
620 | * partition, return count. | |
621 | */ | |
622 | if (!viopath_isactive(pi->lp)) | |
623 | return count; | |
624 | ||
625 | return internal_write(pi, buf, count); | |
626 | } | |
627 | ||
628 | /* | |
629 | * TTY put_char method | |
630 | */ | |
631 | static void viotty_put_char(struct tty_struct *tty, unsigned char ch) | |
632 | { | |
633 | struct port_info *pi; | |
634 | ||
635 | pi = get_port_data(tty); | |
636 | if (pi == NULL) | |
637 | return; | |
638 | ||
639 | /* This will append '\r' as well if the char is '\n' */ | |
640 | if (viochar_is_console(pi)) | |
641 | hvlogOutput(&ch, 1); | |
642 | ||
643 | if (viopath_isactive(pi->lp)) | |
644 | internal_write(pi, &ch, 1); | |
645 | } | |
646 | ||
647 | /* | |
648 | * TTY write_room method | |
649 | */ | |
650 | static int viotty_write_room(struct tty_struct *tty) | |
651 | { | |
652 | int i; | |
653 | int room = 0; | |
654 | struct port_info *pi; | |
655 | unsigned long flags; | |
656 | ||
657 | spin_lock_irqsave(&consolelock, flags); | |
658 | pi = (struct port_info *)tty->driver_data; | |
659 | if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_write_room")) { | |
660 | spin_unlock_irqrestore(&consolelock, flags); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | /* If no buffers are used, return the max size. */ | |
665 | if (pi->used == 0) { | |
666 | spin_unlock_irqrestore(&consolelock, flags); | |
667 | return VIOCHAR_MAX_DATA * VIOCHAR_NUM_BUF; | |
668 | } | |
669 | ||
670 | /* | |
671 | * We retain the spinlock because we want to get an accurate | |
672 | * count and it can change on us between each operation if we | |
673 | * don't hold the spinlock. | |
674 | */ | |
675 | for (i = 0; ((i < VIOCHAR_NUM_BUF) && (room < VIOCHAR_MAX_DATA)); i++) | |
676 | room += (VIOCHAR_MAX_DATA - pi->bufferBytes[i]); | |
677 | spin_unlock_irqrestore(&consolelock, flags); | |
678 | ||
679 | if (room > VIOCHAR_MAX_DATA) | |
680 | room = VIOCHAR_MAX_DATA; | |
681 | return room; | |
682 | } | |
683 | ||
684 | /* | |
685 | * TTY chars_in_buffer method | |
686 | */ | |
687 | static int viotty_chars_in_buffer(struct tty_struct *tty) | |
688 | { | |
689 | return 0; | |
690 | } | |
691 | ||
692 | static int viotty_ioctl(struct tty_struct *tty, struct file *file, | |
693 | unsigned int cmd, unsigned long arg) | |
694 | { | |
695 | switch (cmd) { | |
696 | /* | |
697 | * the ioctls below read/set the flags usually shown in the leds | |
698 | * don't use them - they will go away without warning | |
699 | */ | |
700 | case KDGETLED: | |
701 | case KDGKBLED: | |
702 | return put_user(0, (char *)arg); | |
703 | ||
704 | case KDSKBLED: | |
705 | return 0; | |
706 | } | |
707 | ||
708 | return n_tty_ioctl(tty, file, cmd, arg); | |
709 | } | |
710 | ||
711 | /* | |
712 | * Handle an open charLpEvent. Could be either interrupt or ack | |
713 | */ | |
714 | static void vioHandleOpenEvent(struct HvLpEvent *event) | |
715 | { | |
716 | unsigned long flags; | |
717 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
718 | u8 port = cevent->virtual_device; | |
719 | struct port_info *pi; | |
720 | int reject = 0; | |
721 | ||
677f8c0d | 722 | if (hvlpevent_is_ack(event)) { |
1da177e4 LT |
723 | if (port >= VTTY_PORTS) |
724 | return; | |
725 | ||
726 | spin_lock_irqsave(&consolelock, flags); | |
727 | /* Got the lock, don't cause console output */ | |
728 | ||
729 | pi = &port_info[port]; | |
730 | if (event->xRc == HvLpEvent_Rc_Good) { | |
731 | pi->seq = pi->ack = 0; | |
732 | /* | |
733 | * This line allows connections from the primary | |
734 | * partition but once one is connected from the | |
735 | * primary partition nothing short of a reboot | |
736 | * of linux will allow access from the hosting | |
737 | * partition again without a required iSeries fix. | |
738 | */ | |
739 | pi->lp = event->xTargetLp; | |
740 | } | |
741 | ||
742 | spin_unlock_irqrestore(&consolelock, flags); | |
743 | if (event->xRc != HvLpEvent_Rc_Good) | |
744 | printk(VIOCONS_KERN_WARN | |
745 | "handle_open_event: event->xRc == (%d).\n", | |
746 | event->xRc); | |
747 | ||
748 | if (event->xCorrelationToken != 0) { | |
749 | atomic_t *aptr= (atomic_t *)event->xCorrelationToken; | |
750 | atomic_set(aptr, 1); | |
751 | } else | |
752 | printk(VIOCONS_KERN_WARN | |
753 | "weird...got open ack without atomic\n"); | |
754 | return; | |
755 | } | |
756 | ||
757 | /* This had better require an ack, otherwise complain */ | |
677f8c0d | 758 | if (!hvlpevent_need_ack(event)) { |
1da177e4 LT |
759 | printk(VIOCONS_KERN_WARN "viocharopen without ack bit!\n"); |
760 | return; | |
761 | } | |
762 | ||
763 | spin_lock_irqsave(&consolelock, flags); | |
764 | /* Got the lock, don't cause console output */ | |
765 | ||
766 | /* Make sure this is a good virtual tty */ | |
767 | if (port >= VTTY_PORTS) { | |
768 | event->xRc = HvLpEvent_Rc_SubtypeError; | |
769 | cevent->subtype_result_code = viorc_openRejected; | |
770 | /* | |
771 | * Flag state here since we can't printk while holding | |
772 | * a spinlock. | |
773 | */ | |
774 | reject = 1; | |
775 | } else { | |
776 | pi = &port_info[port]; | |
777 | if ((pi->lp != HvLpIndexInvalid) && | |
778 | (pi->lp != event->xSourceLp)) { | |
779 | /* | |
780 | * If this is tty is already connected to a different | |
781 | * partition, fail. | |
782 | */ | |
783 | event->xRc = HvLpEvent_Rc_SubtypeError; | |
784 | cevent->subtype_result_code = viorc_openRejected; | |
785 | reject = 2; | |
786 | } else { | |
787 | pi->lp = event->xSourceLp; | |
788 | event->xRc = HvLpEvent_Rc_Good; | |
789 | cevent->subtype_result_code = viorc_good; | |
790 | pi->seq = pi->ack = 0; | |
791 | reject = 0; | |
792 | } | |
793 | } | |
794 | ||
795 | spin_unlock_irqrestore(&consolelock, flags); | |
796 | ||
797 | if (reject == 1) | |
798 | printk(VIOCONS_KERN_WARN "open rejected: bad virtual tty.\n"); | |
799 | else if (reject == 2) | |
800 | printk(VIOCONS_KERN_WARN | |
801 | "open rejected: console in exclusive use by another partition.\n"); | |
802 | ||
803 | /* Return the acknowledgement */ | |
804 | HvCallEvent_ackLpEvent(event); | |
805 | } | |
806 | ||
807 | /* | |
808 | * Handle a close charLpEvent. This should ONLY be an Interrupt because the | |
809 | * virtual console should never actually issue a close event to the hypervisor | |
810 | * because the virtual console never goes away. A close event coming from the | |
811 | * hypervisor simply means that there are no client consoles connected to the | |
812 | * virtual console. | |
813 | * | |
814 | * Regardless of the number of connections masqueraded on the other side of | |
815 | * the hypervisor ONLY ONE close event should be called to accompany the ONE | |
816 | * open event that is called. The close event should ONLY be called when NO | |
817 | * MORE connections (masqueraded or not) exist on the other side of the | |
818 | * hypervisor. | |
819 | */ | |
820 | static void vioHandleCloseEvent(struct HvLpEvent *event) | |
821 | { | |
822 | unsigned long flags; | |
823 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
824 | u8 port = cevent->virtual_device; | |
825 | ||
677f8c0d | 826 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
827 | if (port >= VTTY_PORTS) { |
828 | printk(VIOCONS_KERN_WARN | |
829 | "close message from invalid virtual device.\n"); | |
830 | return; | |
831 | } | |
832 | ||
833 | /* For closes, just mark the console partition invalid */ | |
834 | spin_lock_irqsave(&consolelock, flags); | |
835 | /* Got the lock, don't cause console output */ | |
836 | ||
837 | if (port_info[port].lp == event->xSourceLp) | |
838 | port_info[port].lp = HvLpIndexInvalid; | |
839 | ||
840 | spin_unlock_irqrestore(&consolelock, flags); | |
841 | printk(VIOCONS_KERN_INFO "close from %d\n", event->xSourceLp); | |
842 | } else | |
843 | printk(VIOCONS_KERN_WARN | |
844 | "got unexpected close acknowlegement\n"); | |
845 | } | |
846 | ||
847 | /* | |
848 | * Handle a config charLpEvent. Could be either interrupt or ack | |
849 | */ | |
850 | static void vioHandleConfig(struct HvLpEvent *event) | |
851 | { | |
852 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
853 | ||
854 | HvCall_writeLogBuffer(cevent->data, cevent->len); | |
855 | ||
856 | if (cevent->data[0] == 0x01) | |
857 | printk(VIOCONS_KERN_INFO "window resized to %d: %d: %d: %d\n", | |
858 | cevent->data[1], cevent->data[2], | |
859 | cevent->data[3], cevent->data[4]); | |
860 | else | |
861 | printk(VIOCONS_KERN_WARN "unknown config event\n"); | |
862 | } | |
863 | ||
864 | /* | |
865 | * Handle a data charLpEvent. | |
866 | */ | |
867 | static void vioHandleData(struct HvLpEvent *event) | |
868 | { | |
869 | struct tty_struct *tty; | |
870 | unsigned long flags; | |
871 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
872 | struct port_info *pi; | |
873 | int index; | |
415c2e08 | 874 | int num_pushed; |
1da177e4 LT |
875 | u8 port = cevent->virtual_device; |
876 | ||
877 | if (port >= VTTY_PORTS) { | |
878 | printk(VIOCONS_KERN_WARN "data on invalid virtual device %d\n", | |
879 | port); | |
880 | return; | |
881 | } | |
882 | ||
883 | /* | |
884 | * Hold the spinlock so that we don't take an interrupt that | |
885 | * changes tty between the time we fetch the port_info | |
886 | * pointer and the time we paranoia check. | |
887 | */ | |
888 | spin_lock_irqsave(&consolelock, flags); | |
889 | pi = &port_info[port]; | |
890 | ||
891 | /* | |
892 | * Change 05/01/2003 - Ryan Arnold: If a partition other than | |
893 | * the current exclusive partition tries to send us data | |
894 | * events then just drop them on the floor because we don't | |
895 | * want his stinking data. He isn't authorized to receive | |
896 | * data because he wasn't the first one to get the console, | |
897 | * therefore he shouldn't be allowed to send data either. | |
898 | * This will work without an iSeries fix. | |
899 | */ | |
900 | if (pi->lp != event->xSourceLp) { | |
901 | spin_unlock_irqrestore(&consolelock, flags); | |
902 | return; | |
903 | } | |
904 | ||
905 | tty = pi->tty; | |
906 | if (tty == NULL) { | |
907 | spin_unlock_irqrestore(&consolelock, flags); | |
908 | printk(VIOCONS_KERN_WARN "no tty for virtual device %d\n", | |
909 | port); | |
910 | return; | |
911 | } | |
912 | ||
913 | if (tty->magic != TTY_MAGIC) { | |
914 | spin_unlock_irqrestore(&consolelock, flags); | |
915 | printk(VIOCONS_KERN_WARN "tty bad magic\n"); | |
916 | return; | |
917 | } | |
918 | ||
919 | /* | |
920 | * Just to be paranoid, make sure the tty points back to this port | |
921 | */ | |
922 | pi = (struct port_info *)tty->driver_data; | |
923 | if (!pi || viotty_paranoia_check(pi, tty->name, "vioHandleData")) { | |
924 | spin_unlock_irqrestore(&consolelock, flags); | |
925 | return; | |
926 | } | |
927 | spin_unlock_irqrestore(&consolelock, flags); | |
928 | ||
929 | /* | |
930 | * Change 07/21/2003 - Ryan Arnold: functionality added to | |
931 | * support sysrq utilizing ^O as the sysrq key. The sysrq | |
932 | * functionality will only work if built into the kernel and | |
933 | * then only if sysrq is enabled through the proc filesystem. | |
934 | */ | |
415c2e08 | 935 | num_pushed = 0; |
1da177e4 | 936 | for (index = 0; index < cevent->len; index++) { |
5d6f647f IM |
937 | /* |
938 | * Will be optimized away if !CONFIG_MAGIC_SYSRQ: | |
939 | */ | |
940 | if (sysrq_on()) { | |
1da177e4 LT |
941 | /* 0x0f is the ascii character for ^O */ |
942 | if (cevent->data[index] == '\x0f') { | |
943 | vio_sysrq_pressed = 1; | |
944 | /* | |
945 | * continue because we don't want to add | |
946 | * the sysrq key into the data string. | |
947 | */ | |
948 | continue; | |
949 | } else if (vio_sysrq_pressed) { | |
27db2d0c | 950 | handle_sysrq(cevent->data[index], tty); |
1da177e4 LT |
951 | vio_sysrq_pressed = 0; |
952 | /* | |
953 | * continue because we don't want to add | |
954 | * the sysrq sequence into the data string. | |
955 | */ | |
956 | continue; | |
957 | } | |
958 | } | |
1da177e4 LT |
959 | /* |
960 | * The sysrq sequence isn't included in this check if | |
961 | * sysrq is enabled and compiled into the kernel because | |
962 | * the sequence will never get inserted into the buffer. | |
963 | * Don't attempt to copy more data into the buffer than we | |
964 | * have room for because it would fail without indication. | |
965 | */ | |
33f0f88f | 966 | if(tty_insert_flip_char(tty, cevent->data[index], TTY_NORMAL) == 0) { |
1da177e4 LT |
967 | printk(VIOCONS_KERN_WARN "input buffer overflow!\n"); |
968 | break; | |
969 | } | |
415c2e08 | 970 | num_pushed++; |
1da177e4 LT |
971 | } |
972 | ||
415c2e08 | 973 | if (num_pushed) |
1da177e4 LT |
974 | tty_flip_buffer_push(tty); |
975 | } | |
976 | ||
977 | /* | |
978 | * Handle an ack charLpEvent. | |
979 | */ | |
980 | static void vioHandleAck(struct HvLpEvent *event) | |
981 | { | |
982 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
983 | unsigned long flags; | |
984 | u8 port = cevent->virtual_device; | |
985 | ||
986 | if (port >= VTTY_PORTS) { | |
987 | printk(VIOCONS_KERN_WARN "data on invalid virtual device\n"); | |
988 | return; | |
989 | } | |
990 | ||
991 | spin_lock_irqsave(&consolelock, flags); | |
992 | port_info[port].ack = event->xCorrelationToken; | |
993 | spin_unlock_irqrestore(&consolelock, flags); | |
994 | ||
995 | if (port_info[port].used) | |
996 | send_buffers(&port_info[port]); | |
997 | } | |
998 | ||
999 | /* | |
1000 | * Handle charLpEvents and route to the appropriate routine | |
1001 | */ | |
1002 | static void vioHandleCharEvent(struct HvLpEvent *event) | |
1003 | { | |
1004 | int charminor; | |
1005 | ||
1006 | if (event == NULL) | |
1007 | return; | |
1008 | ||
1009 | charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK; | |
1010 | switch (charminor) { | |
1011 | case viocharopen: | |
1012 | vioHandleOpenEvent(event); | |
1013 | break; | |
1014 | case viocharclose: | |
1015 | vioHandleCloseEvent(event); | |
1016 | break; | |
1017 | case viochardata: | |
1018 | vioHandleData(event); | |
1019 | break; | |
1020 | case viocharack: | |
1021 | vioHandleAck(event); | |
1022 | break; | |
1023 | case viocharconfig: | |
1024 | vioHandleConfig(event); | |
1025 | break; | |
1026 | default: | |
677f8c0d | 1027 | if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { |
1da177e4 LT |
1028 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
1029 | HvCallEvent_ackLpEvent(event); | |
1030 | } | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Send an open event | |
1036 | */ | |
1037 | static int send_open(HvLpIndex remoteLp, void *sem) | |
1038 | { | |
1039 | return HvCallEvent_signalLpEventFast(remoteLp, | |
1040 | HvLpEvent_Type_VirtualIo, | |
1041 | viomajorsubtype_chario | viocharopen, | |
1042 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
1043 | viopath_sourceinst(remoteLp), | |
1044 | viopath_targetinst(remoteLp), | |
1045 | (u64)(unsigned long)sem, VIOVERSION << 16, | |
1046 | 0, 0, 0, 0); | |
1047 | } | |
1048 | ||
b68e31d0 | 1049 | static const struct tty_operations serial_ops = { |
1da177e4 LT |
1050 | .open = viotty_open, |
1051 | .close = viotty_close, | |
1052 | .write = viotty_write, | |
1053 | .put_char = viotty_put_char, | |
1054 | .write_room = viotty_write_room, | |
1055 | .chars_in_buffer = viotty_chars_in_buffer, | |
1056 | .ioctl = viotty_ioctl, | |
1057 | }; | |
1058 | ||
1059 | static int __init viocons_init2(void) | |
1060 | { | |
1061 | atomic_t wait_flag; | |
1062 | int rc; | |
1063 | ||
94c8f9f9 SR |
1064 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
1065 | return -ENODEV; | |
1066 | ||
1da177e4 LT |
1067 | /* +2 for fudge */ |
1068 | rc = viopath_open(HvLpConfig_getPrimaryLpIndex(), | |
1069 | viomajorsubtype_chario, VIOCHAR_WINDOW + 2); | |
1070 | if (rc) | |
1071 | printk(VIOCONS_KERN_WARN "error opening to primary %d\n", rc); | |
1072 | ||
1073 | if (viopath_hostLp == HvLpIndexInvalid) | |
1074 | vio_set_hostlp(); | |
1075 | ||
1076 | /* | |
1077 | * And if the primary is not the same as the hosting LP, open to the | |
1078 | * hosting lp | |
1079 | */ | |
1080 | if ((viopath_hostLp != HvLpIndexInvalid) && | |
1081 | (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) { | |
1082 | printk(VIOCONS_KERN_INFO "open path to hosting (%d)\n", | |
1083 | viopath_hostLp); | |
1084 | rc = viopath_open(viopath_hostLp, viomajorsubtype_chario, | |
1085 | VIOCHAR_WINDOW + 2); /* +2 for fudge */ | |
1086 | if (rc) | |
1087 | printk(VIOCONS_KERN_WARN | |
1088 | "error opening to partition %d: %d\n", | |
1089 | viopath_hostLp, rc); | |
1090 | } | |
1091 | ||
1092 | if (vio_setHandler(viomajorsubtype_chario, vioHandleCharEvent) < 0) | |
1093 | printk(VIOCONS_KERN_WARN | |
1094 | "error seting handler for console events!\n"); | |
1095 | ||
1096 | /* | |
1097 | * First, try to open the console to the hosting lp. | |
1098 | * Wait on a semaphore for the response. | |
1099 | */ | |
1100 | atomic_set(&wait_flag, 0); | |
1101 | if ((viopath_isactive(viopath_hostLp)) && | |
1102 | (send_open(viopath_hostLp, (void *)&wait_flag) == 0)) { | |
1103 | printk(VIOCONS_KERN_INFO "hosting partition %d\n", | |
1104 | viopath_hostLp); | |
1105 | while (atomic_read(&wait_flag) == 0) | |
1106 | mb(); | |
1107 | atomic_set(&wait_flag, 0); | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * If we don't have an active console, try the primary | |
1112 | */ | |
1113 | if ((!viopath_isactive(port_info[0].lp)) && | |
1114 | (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) && | |
1115 | (send_open(HvLpConfig_getPrimaryLpIndex(), (void *)&wait_flag) | |
1116 | == 0)) { | |
1117 | printk(VIOCONS_KERN_INFO "opening console to primary partition\n"); | |
1118 | while (atomic_read(&wait_flag) == 0) | |
1119 | mb(); | |
1120 | } | |
1121 | ||
1122 | /* Initialize the tty_driver structure */ | |
1123 | viotty_driver = alloc_tty_driver(VTTY_PORTS); | |
1124 | viotty_driver->owner = THIS_MODULE; | |
1125 | viotty_driver->driver_name = "vioconsole"; | |
1da177e4 LT |
1126 | viotty_driver->name = "tty"; |
1127 | viotty_driver->name_base = 1; | |
1128 | viotty_driver->major = TTY_MAJOR; | |
1129 | viotty_driver->minor_start = 1; | |
1130 | viotty_driver->type = TTY_DRIVER_TYPE_CONSOLE; | |
1131 | viotty_driver->subtype = 1; | |
1132 | viotty_driver->init_termios = tty_std_termios; | |
1133 | viotty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS; | |
1134 | tty_set_operations(viotty_driver, &serial_ops); | |
1135 | ||
1136 | if (tty_register_driver(viotty_driver)) { | |
1137 | printk(VIOCONS_KERN_WARN "couldn't register console driver\n"); | |
1138 | put_tty_driver(viotty_driver); | |
1139 | viotty_driver = NULL; | |
1140 | } | |
1141 | ||
1142 | unregister_console(&viocons_early); | |
1143 | register_console(&viocons); | |
1144 | ||
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | static int __init viocons_init(void) | |
1149 | { | |
1150 | int i; | |
1151 | ||
94c8f9f9 SR |
1152 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
1153 | return -ENODEV; | |
1154 | ||
1da177e4 LT |
1155 | printk(VIOCONS_KERN_INFO "registering console\n"); |
1156 | for (i = 0; i < VTTY_PORTS; i++) { | |
1157 | port_info[i].lp = HvLpIndexInvalid; | |
1158 | port_info[i].magic = VIOTTY_MAGIC; | |
1159 | } | |
1160 | HvCall_setLogBufferFormatAndCodepage(HvCall_LogBuffer_ASCII, 437); | |
8bff05b0 | 1161 | add_preferred_console("viocons", 0, NULL); |
1da177e4 LT |
1162 | register_console(&viocons_early); |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | console_initcall(viocons_init); | |
1167 | module_init(viocons_init2); |