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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 | */ | |
28 | #include <linux/config.h> | |
29 | #include <linux/version.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/proc_fs.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/vmalloc.h> | |
34 | #include <linux/mm.h> | |
35 | #include <linux/console.h> | |
36 | #include <linux/module.h> | |
37 | #include <asm/uaccess.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/wait.h> | |
40 | #include <linux/spinlock.h> | |
41 | #include <asm/ioctls.h> | |
42 | #include <linux/kd.h> | |
43 | #include <linux/tty.h> | |
44 | #include <linux/tty_flip.h> | |
45 | #include <linux/sysrq.h> | |
46 | ||
47 | #include <asm/iSeries/vio.h> | |
48 | ||
e45423ea | 49 | #include <asm/iseries/hv_lp_event.h> |
c0a8d05c | 50 | #include <asm/iseries/hv_call_event.h> |
15b17189 | 51 | #include <asm/iseries/hv_lp_config.h> |
1da44037 | 52 | #include <asm/iseries/hv_call.h> |
1da177e4 LT |
53 | |
54 | #ifdef CONFIG_VT | |
55 | #error You must turn off CONFIG_VT to use CONFIG_VIOCONS | |
56 | #endif | |
57 | ||
58 | #define VIOTTY_MAGIC (0x0DCB) | |
59 | #define VTTY_PORTS 10 | |
60 | ||
61 | #define VIOCONS_KERN_WARN KERN_WARNING "viocons: " | |
62 | #define VIOCONS_KERN_INFO KERN_INFO "viocons: " | |
63 | ||
64 | static DEFINE_SPINLOCK(consolelock); | |
65 | static DEFINE_SPINLOCK(consoleloglock); | |
66 | ||
67 | #ifdef CONFIG_MAGIC_SYSRQ | |
68 | static int vio_sysrq_pressed; | |
69 | extern int sysrq_enabled; | |
70 | #endif | |
71 | ||
72 | /* | |
73 | * The structure of the events that flow between us and OS/400. You can't | |
74 | * mess with this unless the OS/400 side changes too | |
75 | */ | |
76 | struct viocharlpevent { | |
77 | struct HvLpEvent event; | |
78 | u32 reserved; | |
79 | u16 version; | |
80 | u16 subtype_result_code; | |
81 | u8 virtual_device; | |
82 | u8 len; | |
83 | u8 data[VIOCHAR_MAX_DATA]; | |
84 | }; | |
85 | ||
86 | #define VIOCHAR_WINDOW 10 | |
87 | #define VIOCHAR_HIGHWATERMARK 3 | |
88 | ||
89 | enum viocharsubtype { | |
90 | viocharopen = 0x0001, | |
91 | viocharclose = 0x0002, | |
92 | viochardata = 0x0003, | |
93 | viocharack = 0x0004, | |
94 | viocharconfig = 0x0005 | |
95 | }; | |
96 | ||
97 | enum viochar_rc { | |
98 | viochar_rc_ebusy = 1 | |
99 | }; | |
100 | ||
101 | #define VIOCHAR_NUM_BUF 16 | |
102 | ||
103 | /* | |
104 | * Our port information. We store a pointer to one entry in the | |
105 | * tty_driver_data | |
106 | */ | |
107 | static struct port_info { | |
108 | int magic; | |
109 | struct tty_struct *tty; | |
110 | HvLpIndex lp; | |
111 | u8 vcons; | |
112 | u64 seq; /* sequence number of last HV send */ | |
113 | u64 ack; /* last ack from HV */ | |
114 | /* | |
115 | * When we get writes faster than we can send it to the partition, | |
116 | * buffer the data here. Note that used is a bit map of used buffers. | |
117 | * It had better have enough bits to hold VIOCHAR_NUM_BUF the bitops assume | |
118 | * it is a multiple of unsigned long | |
119 | */ | |
120 | unsigned long used; | |
121 | u8 *buffer[VIOCHAR_NUM_BUF]; | |
122 | int bufferBytes[VIOCHAR_NUM_BUF]; | |
123 | int curbuf; | |
124 | int bufferOverflow; | |
125 | int overflowMessage; | |
126 | } port_info[VTTY_PORTS]; | |
127 | ||
128 | #define viochar_is_console(pi) ((pi) == &port_info[0]) | |
129 | #define viochar_port(pi) ((pi) - &port_info[0]) | |
130 | ||
131 | static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp); | |
132 | ||
133 | static struct tty_driver *viotty_driver; | |
134 | ||
135 | void hvlog(char *fmt, ...) | |
136 | { | |
137 | int i; | |
138 | unsigned long flags; | |
139 | va_list args; | |
140 | static char buf[256]; | |
141 | ||
142 | spin_lock_irqsave(&consoleloglock, flags); | |
143 | va_start(args, fmt); | |
144 | i = vscnprintf(buf, sizeof(buf) - 1, fmt, args); | |
145 | va_end(args); | |
146 | buf[i++] = '\r'; | |
147 | HvCall_writeLogBuffer(buf, i); | |
148 | spin_unlock_irqrestore(&consoleloglock, flags); | |
149 | } | |
150 | ||
151 | void hvlogOutput(const char *buf, int count) | |
152 | { | |
153 | unsigned long flags; | |
154 | int begin; | |
155 | int index; | |
156 | static const char cr = '\r'; | |
157 | ||
158 | begin = 0; | |
159 | spin_lock_irqsave(&consoleloglock, flags); | |
160 | for (index = 0; index < count; index++) { | |
161 | if (buf[index] == '\n') { | |
162 | /* | |
163 | * Start right after the last '\n' or at the zeroth | |
164 | * array position and output the number of characters | |
165 | * including the newline. | |
166 | */ | |
167 | HvCall_writeLogBuffer(&buf[begin], index - begin + 1); | |
168 | begin = index + 1; | |
169 | HvCall_writeLogBuffer(&cr, 1); | |
170 | } | |
171 | } | |
172 | if ((index - begin) > 0) | |
173 | HvCall_writeLogBuffer(&buf[begin], index - begin); | |
174 | spin_unlock_irqrestore(&consoleloglock, flags); | |
175 | } | |
176 | ||
177 | /* | |
178 | * Make sure we're pointing to a valid port_info structure. Shamelessly | |
179 | * plagerized from serial.c | |
180 | */ | |
181 | static inline int viotty_paranoia_check(struct port_info *pi, | |
182 | char *name, const char *routine) | |
183 | { | |
184 | static const char *bad_pi_addr = VIOCONS_KERN_WARN | |
185 | "warning: bad address for port_info struct (%s) in %s\n"; | |
186 | static const char *badmagic = VIOCONS_KERN_WARN | |
187 | "warning: bad magic number for port_info struct (%s) in %s\n"; | |
188 | ||
189 | if ((pi < &port_info[0]) || (viochar_port(pi) > VTTY_PORTS)) { | |
190 | printk(bad_pi_addr, name, routine); | |
191 | return 1; | |
192 | } | |
193 | if (pi->magic != VIOTTY_MAGIC) { | |
194 | printk(badmagic, name, routine); | |
195 | return 1; | |
196 | } | |
197 | return 0; | |
198 | } | |
199 | ||
200 | /* | |
201 | * Add data to our pending-send buffers. | |
202 | * | |
203 | * NOTE: Don't use printk in here because it gets nastily recursive. | |
204 | * hvlog can be used to log to the hypervisor buffer | |
205 | */ | |
206 | static int buffer_add(struct port_info *pi, const char *buf, size_t len) | |
207 | { | |
208 | size_t bleft; | |
209 | size_t curlen; | |
210 | const char *curbuf; | |
211 | int nextbuf; | |
212 | ||
213 | curbuf = buf; | |
214 | bleft = len; | |
215 | while (bleft > 0) { | |
216 | /* | |
217 | * If there is no space left in the current buffer, we have | |
218 | * filled everything up, so return. If we filled the previous | |
219 | * buffer we would already have moved to the next one. | |
220 | */ | |
221 | if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) { | |
222 | hvlog ("\n\rviocons: No overflow buffer available for memcpy().\n"); | |
223 | pi->bufferOverflow++; | |
224 | pi->overflowMessage = 1; | |
225 | break; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Turn on the "used" bit for this buffer. If it's already on, | |
230 | * that's fine. | |
231 | */ | |
232 | set_bit(pi->curbuf, &pi->used); | |
233 | ||
234 | /* | |
235 | * See if this buffer has been allocated. If not, allocate it. | |
236 | */ | |
237 | if (pi->buffer[pi->curbuf] == NULL) { | |
238 | pi->buffer[pi->curbuf] = | |
239 | kmalloc(VIOCHAR_MAX_DATA, GFP_ATOMIC); | |
240 | if (pi->buffer[pi->curbuf] == NULL) { | |
241 | hvlog("\n\rviocons: kmalloc failed allocating spaces for buffer %d.", | |
242 | pi->curbuf); | |
243 | break; | |
244 | } | |
245 | } | |
246 | ||
247 | /* Figure out how much we can copy into this buffer. */ | |
248 | if (bleft < (VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf])) | |
249 | curlen = bleft; | |
250 | else | |
251 | curlen = VIOCHAR_MAX_DATA - pi->bufferBytes[pi->curbuf]; | |
252 | ||
253 | /* Copy the data into the buffer. */ | |
254 | memcpy(pi->buffer[pi->curbuf] + pi->bufferBytes[pi->curbuf], | |
255 | curbuf, curlen); | |
256 | ||
257 | pi->bufferBytes[pi->curbuf] += curlen; | |
258 | curbuf += curlen; | |
259 | bleft -= curlen; | |
260 | ||
261 | /* | |
262 | * Now see if we've filled this buffer. If not then | |
263 | * we'll try to use it again later. If we've filled it | |
264 | * up then we'll advance the curbuf to the next in the | |
265 | * circular queue. | |
266 | */ | |
267 | if (pi->bufferBytes[pi->curbuf] == VIOCHAR_MAX_DATA) { | |
268 | nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF; | |
269 | /* | |
270 | * Move to the next buffer if it hasn't been used yet | |
271 | */ | |
272 | if (test_bit(nextbuf, &pi->used) == 0) | |
273 | pi->curbuf = nextbuf; | |
274 | } | |
275 | } | |
276 | return len - bleft; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Send pending data | |
281 | * | |
282 | * NOTE: Don't use printk in here because it gets nastily recursive. | |
283 | * hvlog can be used to log to the hypervisor buffer | |
284 | */ | |
285 | static void send_buffers(struct port_info *pi) | |
286 | { | |
287 | HvLpEvent_Rc hvrc; | |
288 | int nextbuf; | |
289 | struct viocharlpevent *viochar; | |
290 | unsigned long flags; | |
291 | ||
292 | spin_lock_irqsave(&consolelock, flags); | |
293 | ||
294 | viochar = (struct viocharlpevent *) | |
295 | vio_get_event_buffer(viomajorsubtype_chario); | |
296 | ||
297 | /* Make sure we got a buffer */ | |
298 | if (viochar == NULL) { | |
299 | hvlog("\n\rviocons: Can't get viochar buffer in sendBuffers()."); | |
300 | spin_unlock_irqrestore(&consolelock, flags); | |
301 | return; | |
302 | } | |
303 | ||
304 | if (pi->used == 0) { | |
305 | hvlog("\n\rviocons: in sendbuffers(), but no buffers used.\n"); | |
306 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
307 | spin_unlock_irqrestore(&consolelock, flags); | |
308 | return; | |
309 | } | |
310 | ||
311 | /* | |
312 | * curbuf points to the buffer we're filling. We want to | |
313 | * start sending AFTER this one. | |
314 | */ | |
315 | nextbuf = (pi->curbuf + 1) % VIOCHAR_NUM_BUF; | |
316 | ||
317 | /* | |
318 | * Loop until we find a buffer with the used bit on | |
319 | */ | |
320 | while (test_bit(nextbuf, &pi->used) == 0) | |
321 | nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF; | |
322 | ||
323 | initDataEvent(viochar, pi->lp); | |
324 | ||
325 | /* | |
326 | * While we have buffers with data, and our send window | |
327 | * is open, send them | |
328 | */ | |
329 | while ((test_bit(nextbuf, &pi->used)) && | |
330 | ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) { | |
331 | viochar->len = pi->bufferBytes[nextbuf]; | |
332 | viochar->event.xCorrelationToken = pi->seq++; | |
333 | viochar->event.xSizeMinus1 = | |
334 | offsetof(struct viocharlpevent, data) + viochar->len; | |
335 | ||
336 | memcpy(viochar->data, pi->buffer[nextbuf], viochar->len); | |
337 | ||
338 | hvrc = HvCallEvent_signalLpEvent(&viochar->event); | |
339 | if (hvrc) { | |
340 | /* | |
341 | * MUST unlock the spinlock before doing a printk | |
342 | */ | |
343 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
344 | spin_unlock_irqrestore(&consolelock, flags); | |
345 | ||
346 | printk(VIOCONS_KERN_WARN | |
347 | "error sending event! return code %d\n", | |
348 | (int)hvrc); | |
349 | return; | |
350 | } | |
351 | ||
352 | /* | |
353 | * clear the used bit, zero the number of bytes in | |
354 | * this buffer, and move to the next buffer | |
355 | */ | |
356 | clear_bit(nextbuf, &pi->used); | |
357 | pi->bufferBytes[nextbuf] = 0; | |
358 | nextbuf = (nextbuf + 1) % VIOCHAR_NUM_BUF; | |
359 | } | |
360 | ||
361 | /* | |
362 | * If we have emptied all the buffers, start at 0 again. | |
363 | * this will re-use any allocated buffers | |
364 | */ | |
365 | if (pi->used == 0) { | |
366 | pi->curbuf = 0; | |
367 | ||
368 | if (pi->overflowMessage) | |
369 | pi->overflowMessage = 0; | |
370 | ||
371 | if (pi->tty) { | |
372 | tty_wakeup(pi->tty); | |
373 | } | |
374 | } | |
375 | ||
376 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
377 | spin_unlock_irqrestore(&consolelock, flags); | |
378 | } | |
379 | ||
380 | /* | |
381 | * Our internal writer. Gets called both from the console device and | |
382 | * the tty device. the tty pointer will be NULL if called from the console. | |
383 | * Return total number of bytes "written". | |
384 | * | |
385 | * NOTE: Don't use printk in here because it gets nastily recursive. hvlog | |
386 | * can be used to log to the hypervisor buffer | |
387 | */ | |
388 | static int internal_write(struct port_info *pi, const char *buf, size_t len) | |
389 | { | |
390 | HvLpEvent_Rc hvrc; | |
391 | size_t bleft; | |
392 | size_t curlen; | |
393 | const char *curbuf; | |
394 | unsigned long flags; | |
395 | struct viocharlpevent *viochar; | |
396 | ||
397 | /* | |
398 | * Write to the hvlog of inbound data are now done prior to | |
399 | * calling internal_write() since internal_write() is only called in | |
400 | * the event that an lp event path is active, which isn't the case for | |
401 | * logging attempts prior to console initialization. | |
402 | * | |
403 | * If there is already data queued for this port, send it prior to | |
404 | * attempting to send any new data. | |
405 | */ | |
406 | if (pi->used) | |
407 | send_buffers(pi); | |
408 | ||
409 | spin_lock_irqsave(&consolelock, flags); | |
410 | ||
411 | viochar = vio_get_event_buffer(viomajorsubtype_chario); | |
412 | if (viochar == NULL) { | |
413 | spin_unlock_irqrestore(&consolelock, flags); | |
414 | hvlog("\n\rviocons: Can't get vio buffer in internal_write()."); | |
415 | return -EAGAIN; | |
416 | } | |
417 | initDataEvent(viochar, pi->lp); | |
418 | ||
419 | curbuf = buf; | |
420 | bleft = len; | |
421 | ||
422 | while ((bleft > 0) && (pi->used == 0) && | |
423 | ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) { | |
424 | if (bleft > VIOCHAR_MAX_DATA) | |
425 | curlen = VIOCHAR_MAX_DATA; | |
426 | else | |
427 | curlen = bleft; | |
428 | ||
429 | viochar->event.xCorrelationToken = pi->seq++; | |
430 | memcpy(viochar->data, curbuf, curlen); | |
431 | viochar->len = curlen; | |
432 | viochar->event.xSizeMinus1 = | |
433 | offsetof(struct viocharlpevent, data) + curlen; | |
434 | ||
435 | hvrc = HvCallEvent_signalLpEvent(&viochar->event); | |
436 | if (hvrc) { | |
437 | hvlog("viocons: error sending event! %d\n", (int)hvrc); | |
438 | goto out; | |
439 | } | |
440 | curbuf += curlen; | |
441 | bleft -= curlen; | |
442 | } | |
443 | ||
444 | /* If we didn't send it all, buffer as much of it as we can. */ | |
445 | if (bleft > 0) | |
446 | bleft -= buffer_add(pi, curbuf, bleft); | |
447 | out: | |
448 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
449 | spin_unlock_irqrestore(&consolelock, flags); | |
450 | return len - bleft; | |
451 | } | |
452 | ||
453 | static struct port_info *get_port_data(struct tty_struct *tty) | |
454 | { | |
455 | unsigned long flags; | |
456 | struct port_info *pi; | |
457 | ||
458 | spin_lock_irqsave(&consolelock, flags); | |
459 | if (tty) { | |
460 | pi = (struct port_info *)tty->driver_data; | |
461 | if (!pi || viotty_paranoia_check(pi, tty->name, | |
462 | "get_port_data")) { | |
463 | pi = NULL; | |
464 | } | |
465 | } else | |
466 | /* | |
467 | * If this is the console device, use the lp from | |
468 | * the first port entry | |
469 | */ | |
470 | pi = &port_info[0]; | |
471 | spin_unlock_irqrestore(&consolelock, flags); | |
472 | return pi; | |
473 | } | |
474 | ||
475 | /* | |
476 | * Initialize the common fields in a charLpEvent | |
477 | */ | |
478 | static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp) | |
479 | { | |
480 | memset(viochar, 0, sizeof(struct viocharlpevent)); | |
481 | ||
482 | viochar->event.xFlags.xValid = 1; | |
483 | viochar->event.xFlags.xFunction = HvLpEvent_Function_Int; | |
484 | viochar->event.xFlags.xAckInd = HvLpEvent_AckInd_NoAck; | |
485 | viochar->event.xFlags.xAckType = HvLpEvent_AckType_DeferredAck; | |
486 | viochar->event.xType = HvLpEvent_Type_VirtualIo; | |
487 | viochar->event.xSubtype = viomajorsubtype_chario | viochardata; | |
488 | viochar->event.xSourceLp = HvLpConfig_getLpIndex(); | |
489 | viochar->event.xTargetLp = lp; | |
490 | viochar->event.xSizeMinus1 = sizeof(struct viocharlpevent); | |
491 | viochar->event.xSourceInstanceId = viopath_sourceinst(lp); | |
492 | viochar->event.xTargetInstanceId = viopath_targetinst(lp); | |
493 | } | |
494 | ||
495 | /* | |
496 | * early console device write | |
497 | */ | |
498 | static void viocons_write_early(struct console *co, const char *s, unsigned count) | |
499 | { | |
500 | hvlogOutput(s, count); | |
501 | } | |
502 | ||
503 | /* | |
504 | * console device write | |
505 | */ | |
506 | static void viocons_write(struct console *co, const char *s, unsigned count) | |
507 | { | |
508 | int index; | |
509 | int begin; | |
510 | struct port_info *pi; | |
511 | ||
512 | static const char cr = '\r'; | |
513 | ||
514 | /* | |
515 | * Check port data first because the target LP might be valid but | |
516 | * simply not active, in which case we want to hvlog the output. | |
517 | */ | |
518 | pi = get_port_data(NULL); | |
519 | if (pi == NULL) { | |
520 | hvlog("\n\rviocons_write: unable to get port data."); | |
521 | return; | |
522 | } | |
523 | ||
524 | hvlogOutput(s, count); | |
525 | ||
526 | if (!viopath_isactive(pi->lp)) | |
527 | return; | |
528 | ||
529 | /* | |
530 | * Any newline character found will cause a | |
531 | * carriage return character to be emitted as well. | |
532 | */ | |
533 | begin = 0; | |
534 | for (index = 0; index < count; index++) { | |
535 | if (s[index] == '\n') { | |
536 | /* | |
537 | * Newline found. Print everything up to and | |
538 | * including the newline | |
539 | */ | |
540 | internal_write(pi, &s[begin], index - begin + 1); | |
541 | begin = index + 1; | |
542 | /* Emit a carriage return as well */ | |
543 | internal_write(pi, &cr, 1); | |
544 | } | |
545 | } | |
546 | ||
547 | /* If any characters left to write, write them now */ | |
548 | if ((index - begin) > 0) | |
549 | internal_write(pi, &s[begin], index - begin); | |
550 | } | |
551 | ||
552 | /* | |
553 | * Work out the device associate with this console | |
554 | */ | |
555 | static struct tty_driver *viocons_device(struct console *c, int *index) | |
556 | { | |
557 | *index = c->index; | |
558 | return viotty_driver; | |
559 | } | |
560 | ||
561 | /* | |
562 | * console device I/O methods | |
563 | */ | |
564 | static struct console viocons_early = { | |
565 | .name = "viocons", | |
566 | .write = viocons_write_early, | |
567 | .flags = CON_PRINTBUFFER, | |
568 | .index = -1, | |
569 | }; | |
570 | ||
571 | static struct console viocons = { | |
572 | .name = "viocons", | |
573 | .write = viocons_write, | |
574 | .device = viocons_device, | |
575 | .flags = CON_PRINTBUFFER, | |
576 | .index = -1, | |
577 | }; | |
578 | ||
579 | /* | |
580 | * TTY Open method | |
581 | */ | |
582 | static int viotty_open(struct tty_struct *tty, struct file *filp) | |
583 | { | |
584 | int port; | |
585 | unsigned long flags; | |
586 | struct port_info *pi; | |
587 | ||
588 | port = tty->index; | |
589 | ||
590 | if ((port < 0) || (port >= VTTY_PORTS)) | |
591 | return -ENODEV; | |
592 | ||
593 | spin_lock_irqsave(&consolelock, flags); | |
594 | ||
595 | pi = &port_info[port]; | |
596 | /* If some other TTY is already connected here, reject the open */ | |
597 | if ((pi->tty) && (pi->tty != tty)) { | |
598 | spin_unlock_irqrestore(&consolelock, flags); | |
599 | printk(VIOCONS_KERN_WARN | |
600 | "attempt to open device twice from different ttys\n"); | |
601 | return -EBUSY; | |
602 | } | |
603 | tty->driver_data = pi; | |
604 | pi->tty = tty; | |
605 | spin_unlock_irqrestore(&consolelock, flags); | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | /* | |
611 | * TTY Close method | |
612 | */ | |
613 | static void viotty_close(struct tty_struct *tty, struct file *filp) | |
614 | { | |
615 | unsigned long flags; | |
616 | struct port_info *pi; | |
617 | ||
618 | spin_lock_irqsave(&consolelock, flags); | |
619 | pi = (struct port_info *)tty->driver_data; | |
620 | ||
621 | if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_close")) { | |
622 | spin_unlock_irqrestore(&consolelock, flags); | |
623 | return; | |
624 | } | |
625 | if (tty->count == 1) | |
626 | pi->tty = NULL; | |
627 | spin_unlock_irqrestore(&consolelock, flags); | |
628 | } | |
629 | ||
630 | /* | |
631 | * TTY Write method | |
632 | */ | |
633 | static int viotty_write(struct tty_struct *tty, const unsigned char *buf, | |
634 | int count) | |
635 | { | |
636 | struct port_info *pi; | |
637 | ||
638 | pi = get_port_data(tty); | |
639 | if (pi == NULL) { | |
640 | hvlog("\n\rviotty_write: no port data."); | |
641 | return -ENODEV; | |
642 | } | |
643 | ||
644 | if (viochar_is_console(pi)) | |
645 | hvlogOutput(buf, count); | |
646 | ||
647 | /* | |
648 | * If the path to this LP is closed, don't bother doing anything more. | |
649 | * just dump the data on the floor and return count. For some reason | |
650 | * some user level programs will attempt to probe available tty's and | |
651 | * they'll attempt a viotty_write on an invalid port which maps to an | |
652 | * invalid target lp. If this is the case then ignore the | |
653 | * viotty_write call and, since the viopath isn't active to this | |
654 | * partition, return count. | |
655 | */ | |
656 | if (!viopath_isactive(pi->lp)) | |
657 | return count; | |
658 | ||
659 | return internal_write(pi, buf, count); | |
660 | } | |
661 | ||
662 | /* | |
663 | * TTY put_char method | |
664 | */ | |
665 | static void viotty_put_char(struct tty_struct *tty, unsigned char ch) | |
666 | { | |
667 | struct port_info *pi; | |
668 | ||
669 | pi = get_port_data(tty); | |
670 | if (pi == NULL) | |
671 | return; | |
672 | ||
673 | /* This will append '\r' as well if the char is '\n' */ | |
674 | if (viochar_is_console(pi)) | |
675 | hvlogOutput(&ch, 1); | |
676 | ||
677 | if (viopath_isactive(pi->lp)) | |
678 | internal_write(pi, &ch, 1); | |
679 | } | |
680 | ||
681 | /* | |
682 | * TTY write_room method | |
683 | */ | |
684 | static int viotty_write_room(struct tty_struct *tty) | |
685 | { | |
686 | int i; | |
687 | int room = 0; | |
688 | struct port_info *pi; | |
689 | unsigned long flags; | |
690 | ||
691 | spin_lock_irqsave(&consolelock, flags); | |
692 | pi = (struct port_info *)tty->driver_data; | |
693 | if (!pi || viotty_paranoia_check(pi, tty->name, "viotty_write_room")) { | |
694 | spin_unlock_irqrestore(&consolelock, flags); | |
695 | return 0; | |
696 | } | |
697 | ||
698 | /* If no buffers are used, return the max size. */ | |
699 | if (pi->used == 0) { | |
700 | spin_unlock_irqrestore(&consolelock, flags); | |
701 | return VIOCHAR_MAX_DATA * VIOCHAR_NUM_BUF; | |
702 | } | |
703 | ||
704 | /* | |
705 | * We retain the spinlock because we want to get an accurate | |
706 | * count and it can change on us between each operation if we | |
707 | * don't hold the spinlock. | |
708 | */ | |
709 | for (i = 0; ((i < VIOCHAR_NUM_BUF) && (room < VIOCHAR_MAX_DATA)); i++) | |
710 | room += (VIOCHAR_MAX_DATA - pi->bufferBytes[i]); | |
711 | spin_unlock_irqrestore(&consolelock, flags); | |
712 | ||
713 | if (room > VIOCHAR_MAX_DATA) | |
714 | room = VIOCHAR_MAX_DATA; | |
715 | return room; | |
716 | } | |
717 | ||
718 | /* | |
719 | * TTY chars_in_buffer method | |
720 | */ | |
721 | static int viotty_chars_in_buffer(struct tty_struct *tty) | |
722 | { | |
723 | return 0; | |
724 | } | |
725 | ||
726 | static int viotty_ioctl(struct tty_struct *tty, struct file *file, | |
727 | unsigned int cmd, unsigned long arg) | |
728 | { | |
729 | switch (cmd) { | |
730 | /* | |
731 | * the ioctls below read/set the flags usually shown in the leds | |
732 | * don't use them - they will go away without warning | |
733 | */ | |
734 | case KDGETLED: | |
735 | case KDGKBLED: | |
736 | return put_user(0, (char *)arg); | |
737 | ||
738 | case KDSKBLED: | |
739 | return 0; | |
740 | } | |
741 | ||
742 | return n_tty_ioctl(tty, file, cmd, arg); | |
743 | } | |
744 | ||
745 | /* | |
746 | * Handle an open charLpEvent. Could be either interrupt or ack | |
747 | */ | |
748 | static void vioHandleOpenEvent(struct HvLpEvent *event) | |
749 | { | |
750 | unsigned long flags; | |
751 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
752 | u8 port = cevent->virtual_device; | |
753 | struct port_info *pi; | |
754 | int reject = 0; | |
755 | ||
756 | if (event->xFlags.xFunction == HvLpEvent_Function_Ack) { | |
757 | if (port >= VTTY_PORTS) | |
758 | return; | |
759 | ||
760 | spin_lock_irqsave(&consolelock, flags); | |
761 | /* Got the lock, don't cause console output */ | |
762 | ||
763 | pi = &port_info[port]; | |
764 | if (event->xRc == HvLpEvent_Rc_Good) { | |
765 | pi->seq = pi->ack = 0; | |
766 | /* | |
767 | * This line allows connections from the primary | |
768 | * partition but once one is connected from the | |
769 | * primary partition nothing short of a reboot | |
770 | * of linux will allow access from the hosting | |
771 | * partition again without a required iSeries fix. | |
772 | */ | |
773 | pi->lp = event->xTargetLp; | |
774 | } | |
775 | ||
776 | spin_unlock_irqrestore(&consolelock, flags); | |
777 | if (event->xRc != HvLpEvent_Rc_Good) | |
778 | printk(VIOCONS_KERN_WARN | |
779 | "handle_open_event: event->xRc == (%d).\n", | |
780 | event->xRc); | |
781 | ||
782 | if (event->xCorrelationToken != 0) { | |
783 | atomic_t *aptr= (atomic_t *)event->xCorrelationToken; | |
784 | atomic_set(aptr, 1); | |
785 | } else | |
786 | printk(VIOCONS_KERN_WARN | |
787 | "weird...got open ack without atomic\n"); | |
788 | return; | |
789 | } | |
790 | ||
791 | /* This had better require an ack, otherwise complain */ | |
792 | if (event->xFlags.xAckInd != HvLpEvent_AckInd_DoAck) { | |
793 | printk(VIOCONS_KERN_WARN "viocharopen without ack bit!\n"); | |
794 | return; | |
795 | } | |
796 | ||
797 | spin_lock_irqsave(&consolelock, flags); | |
798 | /* Got the lock, don't cause console output */ | |
799 | ||
800 | /* Make sure this is a good virtual tty */ | |
801 | if (port >= VTTY_PORTS) { | |
802 | event->xRc = HvLpEvent_Rc_SubtypeError; | |
803 | cevent->subtype_result_code = viorc_openRejected; | |
804 | /* | |
805 | * Flag state here since we can't printk while holding | |
806 | * a spinlock. | |
807 | */ | |
808 | reject = 1; | |
809 | } else { | |
810 | pi = &port_info[port]; | |
811 | if ((pi->lp != HvLpIndexInvalid) && | |
812 | (pi->lp != event->xSourceLp)) { | |
813 | /* | |
814 | * If this is tty is already connected to a different | |
815 | * partition, fail. | |
816 | */ | |
817 | event->xRc = HvLpEvent_Rc_SubtypeError; | |
818 | cevent->subtype_result_code = viorc_openRejected; | |
819 | reject = 2; | |
820 | } else { | |
821 | pi->lp = event->xSourceLp; | |
822 | event->xRc = HvLpEvent_Rc_Good; | |
823 | cevent->subtype_result_code = viorc_good; | |
824 | pi->seq = pi->ack = 0; | |
825 | reject = 0; | |
826 | } | |
827 | } | |
828 | ||
829 | spin_unlock_irqrestore(&consolelock, flags); | |
830 | ||
831 | if (reject == 1) | |
832 | printk(VIOCONS_KERN_WARN "open rejected: bad virtual tty.\n"); | |
833 | else if (reject == 2) | |
834 | printk(VIOCONS_KERN_WARN | |
835 | "open rejected: console in exclusive use by another partition.\n"); | |
836 | ||
837 | /* Return the acknowledgement */ | |
838 | HvCallEvent_ackLpEvent(event); | |
839 | } | |
840 | ||
841 | /* | |
842 | * Handle a close charLpEvent. This should ONLY be an Interrupt because the | |
843 | * virtual console should never actually issue a close event to the hypervisor | |
844 | * because the virtual console never goes away. A close event coming from the | |
845 | * hypervisor simply means that there are no client consoles connected to the | |
846 | * virtual console. | |
847 | * | |
848 | * Regardless of the number of connections masqueraded on the other side of | |
849 | * the hypervisor ONLY ONE close event should be called to accompany the ONE | |
850 | * open event that is called. The close event should ONLY be called when NO | |
851 | * MORE connections (masqueraded or not) exist on the other side of the | |
852 | * hypervisor. | |
853 | */ | |
854 | static void vioHandleCloseEvent(struct HvLpEvent *event) | |
855 | { | |
856 | unsigned long flags; | |
857 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
858 | u8 port = cevent->virtual_device; | |
859 | ||
860 | if (event->xFlags.xFunction == HvLpEvent_Function_Int) { | |
861 | if (port >= VTTY_PORTS) { | |
862 | printk(VIOCONS_KERN_WARN | |
863 | "close message from invalid virtual device.\n"); | |
864 | return; | |
865 | } | |
866 | ||
867 | /* For closes, just mark the console partition invalid */ | |
868 | spin_lock_irqsave(&consolelock, flags); | |
869 | /* Got the lock, don't cause console output */ | |
870 | ||
871 | if (port_info[port].lp == event->xSourceLp) | |
872 | port_info[port].lp = HvLpIndexInvalid; | |
873 | ||
874 | spin_unlock_irqrestore(&consolelock, flags); | |
875 | printk(VIOCONS_KERN_INFO "close from %d\n", event->xSourceLp); | |
876 | } else | |
877 | printk(VIOCONS_KERN_WARN | |
878 | "got unexpected close acknowlegement\n"); | |
879 | } | |
880 | ||
881 | /* | |
882 | * Handle a config charLpEvent. Could be either interrupt or ack | |
883 | */ | |
884 | static void vioHandleConfig(struct HvLpEvent *event) | |
885 | { | |
886 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
887 | ||
888 | HvCall_writeLogBuffer(cevent->data, cevent->len); | |
889 | ||
890 | if (cevent->data[0] == 0x01) | |
891 | printk(VIOCONS_KERN_INFO "window resized to %d: %d: %d: %d\n", | |
892 | cevent->data[1], cevent->data[2], | |
893 | cevent->data[3], cevent->data[4]); | |
894 | else | |
895 | printk(VIOCONS_KERN_WARN "unknown config event\n"); | |
896 | } | |
897 | ||
898 | /* | |
899 | * Handle a data charLpEvent. | |
900 | */ | |
901 | static void vioHandleData(struct HvLpEvent *event) | |
902 | { | |
903 | struct tty_struct *tty; | |
904 | unsigned long flags; | |
905 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
906 | struct port_info *pi; | |
907 | int index; | |
908 | u8 port = cevent->virtual_device; | |
909 | ||
910 | if (port >= VTTY_PORTS) { | |
911 | printk(VIOCONS_KERN_WARN "data on invalid virtual device %d\n", | |
912 | port); | |
913 | return; | |
914 | } | |
915 | ||
916 | /* | |
917 | * Hold the spinlock so that we don't take an interrupt that | |
918 | * changes tty between the time we fetch the port_info | |
919 | * pointer and the time we paranoia check. | |
920 | */ | |
921 | spin_lock_irqsave(&consolelock, flags); | |
922 | pi = &port_info[port]; | |
923 | ||
924 | /* | |
925 | * Change 05/01/2003 - Ryan Arnold: If a partition other than | |
926 | * the current exclusive partition tries to send us data | |
927 | * events then just drop them on the floor because we don't | |
928 | * want his stinking data. He isn't authorized to receive | |
929 | * data because he wasn't the first one to get the console, | |
930 | * therefore he shouldn't be allowed to send data either. | |
931 | * This will work without an iSeries fix. | |
932 | */ | |
933 | if (pi->lp != event->xSourceLp) { | |
934 | spin_unlock_irqrestore(&consolelock, flags); | |
935 | return; | |
936 | } | |
937 | ||
938 | tty = pi->tty; | |
939 | if (tty == NULL) { | |
940 | spin_unlock_irqrestore(&consolelock, flags); | |
941 | printk(VIOCONS_KERN_WARN "no tty for virtual device %d\n", | |
942 | port); | |
943 | return; | |
944 | } | |
945 | ||
946 | if (tty->magic != TTY_MAGIC) { | |
947 | spin_unlock_irqrestore(&consolelock, flags); | |
948 | printk(VIOCONS_KERN_WARN "tty bad magic\n"); | |
949 | return; | |
950 | } | |
951 | ||
952 | /* | |
953 | * Just to be paranoid, make sure the tty points back to this port | |
954 | */ | |
955 | pi = (struct port_info *)tty->driver_data; | |
956 | if (!pi || viotty_paranoia_check(pi, tty->name, "vioHandleData")) { | |
957 | spin_unlock_irqrestore(&consolelock, flags); | |
958 | return; | |
959 | } | |
960 | spin_unlock_irqrestore(&consolelock, flags); | |
961 | ||
962 | /* | |
963 | * Change 07/21/2003 - Ryan Arnold: functionality added to | |
964 | * support sysrq utilizing ^O as the sysrq key. The sysrq | |
965 | * functionality will only work if built into the kernel and | |
966 | * then only if sysrq is enabled through the proc filesystem. | |
967 | */ | |
968 | for (index = 0; index < cevent->len; index++) { | |
969 | #ifdef CONFIG_MAGIC_SYSRQ | |
970 | if (sysrq_enabled) { | |
971 | /* 0x0f is the ascii character for ^O */ | |
972 | if (cevent->data[index] == '\x0f') { | |
973 | vio_sysrq_pressed = 1; | |
974 | /* | |
975 | * continue because we don't want to add | |
976 | * the sysrq key into the data string. | |
977 | */ | |
978 | continue; | |
979 | } else if (vio_sysrq_pressed) { | |
980 | handle_sysrq(cevent->data[index], NULL, tty); | |
981 | vio_sysrq_pressed = 0; | |
982 | /* | |
983 | * continue because we don't want to add | |
984 | * the sysrq sequence into the data string. | |
985 | */ | |
986 | continue; | |
987 | } | |
988 | } | |
989 | #endif | |
990 | /* | |
991 | * The sysrq sequence isn't included in this check if | |
992 | * sysrq is enabled and compiled into the kernel because | |
993 | * the sequence will never get inserted into the buffer. | |
994 | * Don't attempt to copy more data into the buffer than we | |
995 | * have room for because it would fail without indication. | |
996 | */ | |
997 | if ((tty->flip.count + 1) > TTY_FLIPBUF_SIZE) { | |
998 | printk(VIOCONS_KERN_WARN "input buffer overflow!\n"); | |
999 | break; | |
1000 | } | |
1001 | tty_insert_flip_char(tty, cevent->data[index], TTY_NORMAL); | |
1002 | } | |
1003 | ||
1004 | /* if cevent->len == 0 then no data was added to the buffer and flip.count == 0 */ | |
1005 | if (tty->flip.count) | |
1006 | /* The next call resets flip.count when the data is flushed. */ | |
1007 | tty_flip_buffer_push(tty); | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Handle an ack charLpEvent. | |
1012 | */ | |
1013 | static void vioHandleAck(struct HvLpEvent *event) | |
1014 | { | |
1015 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
1016 | unsigned long flags; | |
1017 | u8 port = cevent->virtual_device; | |
1018 | ||
1019 | if (port >= VTTY_PORTS) { | |
1020 | printk(VIOCONS_KERN_WARN "data on invalid virtual device\n"); | |
1021 | return; | |
1022 | } | |
1023 | ||
1024 | spin_lock_irqsave(&consolelock, flags); | |
1025 | port_info[port].ack = event->xCorrelationToken; | |
1026 | spin_unlock_irqrestore(&consolelock, flags); | |
1027 | ||
1028 | if (port_info[port].used) | |
1029 | send_buffers(&port_info[port]); | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * Handle charLpEvents and route to the appropriate routine | |
1034 | */ | |
1035 | static void vioHandleCharEvent(struct HvLpEvent *event) | |
1036 | { | |
1037 | int charminor; | |
1038 | ||
1039 | if (event == NULL) | |
1040 | return; | |
1041 | ||
1042 | charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK; | |
1043 | switch (charminor) { | |
1044 | case viocharopen: | |
1045 | vioHandleOpenEvent(event); | |
1046 | break; | |
1047 | case viocharclose: | |
1048 | vioHandleCloseEvent(event); | |
1049 | break; | |
1050 | case viochardata: | |
1051 | vioHandleData(event); | |
1052 | break; | |
1053 | case viocharack: | |
1054 | vioHandleAck(event); | |
1055 | break; | |
1056 | case viocharconfig: | |
1057 | vioHandleConfig(event); | |
1058 | break; | |
1059 | default: | |
1060 | if ((event->xFlags.xFunction == HvLpEvent_Function_Int) && | |
1061 | (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) { | |
1062 | event->xRc = HvLpEvent_Rc_InvalidSubtype; | |
1063 | HvCallEvent_ackLpEvent(event); | |
1064 | } | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * Send an open event | |
1070 | */ | |
1071 | static int send_open(HvLpIndex remoteLp, void *sem) | |
1072 | { | |
1073 | return HvCallEvent_signalLpEventFast(remoteLp, | |
1074 | HvLpEvent_Type_VirtualIo, | |
1075 | viomajorsubtype_chario | viocharopen, | |
1076 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
1077 | viopath_sourceinst(remoteLp), | |
1078 | viopath_targetinst(remoteLp), | |
1079 | (u64)(unsigned long)sem, VIOVERSION << 16, | |
1080 | 0, 0, 0, 0); | |
1081 | } | |
1082 | ||
1083 | static struct tty_operations serial_ops = { | |
1084 | .open = viotty_open, | |
1085 | .close = viotty_close, | |
1086 | .write = viotty_write, | |
1087 | .put_char = viotty_put_char, | |
1088 | .write_room = viotty_write_room, | |
1089 | .chars_in_buffer = viotty_chars_in_buffer, | |
1090 | .ioctl = viotty_ioctl, | |
1091 | }; | |
1092 | ||
1093 | static int __init viocons_init2(void) | |
1094 | { | |
1095 | atomic_t wait_flag; | |
1096 | int rc; | |
1097 | ||
1098 | /* +2 for fudge */ | |
1099 | rc = viopath_open(HvLpConfig_getPrimaryLpIndex(), | |
1100 | viomajorsubtype_chario, VIOCHAR_WINDOW + 2); | |
1101 | if (rc) | |
1102 | printk(VIOCONS_KERN_WARN "error opening to primary %d\n", rc); | |
1103 | ||
1104 | if (viopath_hostLp == HvLpIndexInvalid) | |
1105 | vio_set_hostlp(); | |
1106 | ||
1107 | /* | |
1108 | * And if the primary is not the same as the hosting LP, open to the | |
1109 | * hosting lp | |
1110 | */ | |
1111 | if ((viopath_hostLp != HvLpIndexInvalid) && | |
1112 | (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) { | |
1113 | printk(VIOCONS_KERN_INFO "open path to hosting (%d)\n", | |
1114 | viopath_hostLp); | |
1115 | rc = viopath_open(viopath_hostLp, viomajorsubtype_chario, | |
1116 | VIOCHAR_WINDOW + 2); /* +2 for fudge */ | |
1117 | if (rc) | |
1118 | printk(VIOCONS_KERN_WARN | |
1119 | "error opening to partition %d: %d\n", | |
1120 | viopath_hostLp, rc); | |
1121 | } | |
1122 | ||
1123 | if (vio_setHandler(viomajorsubtype_chario, vioHandleCharEvent) < 0) | |
1124 | printk(VIOCONS_KERN_WARN | |
1125 | "error seting handler for console events!\n"); | |
1126 | ||
1127 | /* | |
1128 | * First, try to open the console to the hosting lp. | |
1129 | * Wait on a semaphore for the response. | |
1130 | */ | |
1131 | atomic_set(&wait_flag, 0); | |
1132 | if ((viopath_isactive(viopath_hostLp)) && | |
1133 | (send_open(viopath_hostLp, (void *)&wait_flag) == 0)) { | |
1134 | printk(VIOCONS_KERN_INFO "hosting partition %d\n", | |
1135 | viopath_hostLp); | |
1136 | while (atomic_read(&wait_flag) == 0) | |
1137 | mb(); | |
1138 | atomic_set(&wait_flag, 0); | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * If we don't have an active console, try the primary | |
1143 | */ | |
1144 | if ((!viopath_isactive(port_info[0].lp)) && | |
1145 | (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) && | |
1146 | (send_open(HvLpConfig_getPrimaryLpIndex(), (void *)&wait_flag) | |
1147 | == 0)) { | |
1148 | printk(VIOCONS_KERN_INFO "opening console to primary partition\n"); | |
1149 | while (atomic_read(&wait_flag) == 0) | |
1150 | mb(); | |
1151 | } | |
1152 | ||
1153 | /* Initialize the tty_driver structure */ | |
1154 | viotty_driver = alloc_tty_driver(VTTY_PORTS); | |
1155 | viotty_driver->owner = THIS_MODULE; | |
1156 | viotty_driver->driver_name = "vioconsole"; | |
1157 | viotty_driver->devfs_name = "vcs/"; | |
1158 | viotty_driver->name = "tty"; | |
1159 | viotty_driver->name_base = 1; | |
1160 | viotty_driver->major = TTY_MAJOR; | |
1161 | viotty_driver->minor_start = 1; | |
1162 | viotty_driver->type = TTY_DRIVER_TYPE_CONSOLE; | |
1163 | viotty_driver->subtype = 1; | |
1164 | viotty_driver->init_termios = tty_std_termios; | |
1165 | viotty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS; | |
1166 | tty_set_operations(viotty_driver, &serial_ops); | |
1167 | ||
1168 | if (tty_register_driver(viotty_driver)) { | |
1169 | printk(VIOCONS_KERN_WARN "couldn't register console driver\n"); | |
1170 | put_tty_driver(viotty_driver); | |
1171 | viotty_driver = NULL; | |
1172 | } | |
1173 | ||
1174 | unregister_console(&viocons_early); | |
1175 | register_console(&viocons); | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | static int __init viocons_init(void) | |
1181 | { | |
1182 | int i; | |
1183 | ||
1184 | printk(VIOCONS_KERN_INFO "registering console\n"); | |
1185 | for (i = 0; i < VTTY_PORTS; i++) { | |
1186 | port_info[i].lp = HvLpIndexInvalid; | |
1187 | port_info[i].magic = VIOTTY_MAGIC; | |
1188 | } | |
1189 | HvCall_setLogBufferFormatAndCodepage(HvCall_LogBuffer_ASCII, 437); | |
1190 | register_console(&viocons_early); | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | console_initcall(viocons_init); | |
1195 | module_init(viocons_init2); |