Commit | Line | Data |
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8bff05b0 SR |
1 | /* |
2 | * iSeries vio driver interface to hvc_console.c | |
3 | * | |
4 | * This code is based heavily on hvc_vio.c and viocons.c | |
5 | * | |
6 | * Copyright (C) 2006 Stephen Rothwell, IBM Corporation | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | #include <stdarg.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/console.h> | |
28 | ||
29 | #include <asm/hvconsole.h> | |
30 | #include <asm/vio.h> | |
31 | #include <asm/prom.h> | |
de0138da | 32 | #include <asm/firmware.h> |
8bff05b0 SR |
33 | #include <asm/iseries/vio.h> |
34 | #include <asm/iseries/hv_call.h> | |
35 | #include <asm/iseries/hv_lp_config.h> | |
36 | #include <asm/iseries/hv_lp_event.h> | |
37 | ||
38 | #include "hvc_console.h" | |
39 | ||
40 | #define VTTY_PORTS 10 | |
41 | ||
42 | static DEFINE_SPINLOCK(consolelock); | |
43 | static DEFINE_SPINLOCK(consoleloglock); | |
44 | ||
45 | static const char hvc_driver_name[] = "hvc_console"; | |
46 | ||
47 | #define IN_BUF_SIZE 200 | |
48 | ||
49 | /* | |
50 | * Our port information. | |
51 | */ | |
52 | static struct port_info { | |
53 | HvLpIndex lp; | |
54 | u64 seq; /* sequence number of last HV send */ | |
55 | u64 ack; /* last ack from HV */ | |
56 | struct hvc_struct *hp; | |
57 | int in_start; | |
58 | int in_end; | |
59 | unsigned char in_buf[IN_BUF_SIZE]; | |
60 | } port_info[VTTY_PORTS] = { | |
61 | [ 0 ... VTTY_PORTS - 1 ] = { | |
62 | .lp = HvLpIndexInvalid | |
63 | } | |
64 | }; | |
65 | ||
66 | #define viochar_is_console(pi) ((pi) == &port_info[0]) | |
67 | ||
68 | static struct vio_device_id hvc_driver_table[] __devinitdata = { | |
69 | {"serial", "IBM,iSeries-vty"}, | |
70 | { "", "" } | |
71 | }; | |
72 | MODULE_DEVICE_TABLE(vio, hvc_driver_table); | |
73 | ||
74 | static void hvlog(char *fmt, ...) | |
75 | { | |
76 | int i; | |
77 | unsigned long flags; | |
78 | va_list args; | |
79 | static char buf[256]; | |
80 | ||
81 | spin_lock_irqsave(&consoleloglock, flags); | |
82 | va_start(args, fmt); | |
83 | i = vscnprintf(buf, sizeof(buf) - 1, fmt, args); | |
84 | va_end(args); | |
85 | buf[i++] = '\r'; | |
86 | HvCall_writeLogBuffer(buf, i); | |
87 | spin_unlock_irqrestore(&consoleloglock, flags); | |
88 | } | |
89 | ||
90 | /* | |
91 | * Initialize the common fields in a charLpEvent | |
92 | */ | |
93 | static void init_data_event(struct viocharlpevent *viochar, HvLpIndex lp) | |
94 | { | |
95 | struct HvLpEvent *hev = &viochar->event; | |
96 | ||
97 | memset(viochar, 0, sizeof(struct viocharlpevent)); | |
98 | ||
99 | hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK | | |
100 | HV_LP_EVENT_INT; | |
101 | hev->xType = HvLpEvent_Type_VirtualIo; | |
102 | hev->xSubtype = viomajorsubtype_chario | viochardata; | |
103 | hev->xSourceLp = HvLpConfig_getLpIndex(); | |
104 | hev->xTargetLp = lp; | |
105 | hev->xSizeMinus1 = sizeof(struct viocharlpevent); | |
106 | hev->xSourceInstanceId = viopath_sourceinst(lp); | |
107 | hev->xTargetInstanceId = viopath_targetinst(lp); | |
108 | } | |
109 | ||
110 | static int get_chars(uint32_t vtermno, char *buf, int count) | |
111 | { | |
112 | struct port_info *pi; | |
113 | int n = 0; | |
114 | unsigned long flags; | |
115 | ||
116 | if (vtermno >= VTTY_PORTS) | |
117 | return -EINVAL; | |
118 | if (count == 0) | |
119 | return 0; | |
120 | ||
121 | pi = &port_info[vtermno]; | |
122 | spin_lock_irqsave(&consolelock, flags); | |
123 | ||
124 | if (pi->in_end == 0) | |
125 | goto done; | |
126 | ||
127 | n = pi->in_end - pi->in_start; | |
128 | if (n > count) | |
129 | n = count; | |
130 | memcpy(buf, &pi->in_buf[pi->in_start], n); | |
131 | pi->in_start += n; | |
132 | if (pi->in_start == pi->in_end) { | |
133 | pi->in_start = 0; | |
134 | pi->in_end = 0; | |
135 | } | |
136 | done: | |
137 | spin_unlock_irqrestore(&consolelock, flags); | |
138 | return n; | |
139 | } | |
140 | ||
141 | static int put_chars(uint32_t vtermno, const char *buf, int count) | |
142 | { | |
143 | struct viocharlpevent *viochar; | |
144 | struct port_info *pi; | |
145 | HvLpEvent_Rc hvrc; | |
146 | unsigned long flags; | |
147 | int sent = 0; | |
148 | ||
149 | if (vtermno >= VTTY_PORTS) | |
150 | return -EINVAL; | |
151 | ||
152 | pi = &port_info[vtermno]; | |
153 | ||
154 | spin_lock_irqsave(&consolelock, flags); | |
155 | ||
156 | if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) { | |
8bff05b0 | 157 | HvCall_writeLogBuffer(buf, count); |
8bff05b0 SR |
158 | sent = count; |
159 | goto done; | |
160 | } | |
161 | ||
162 | viochar = vio_get_event_buffer(viomajorsubtype_chario); | |
163 | if (viochar == NULL) { | |
164 | hvlog("\n\rviocons: Can't get viochar buffer."); | |
165 | goto done; | |
166 | } | |
167 | ||
168 | while ((count > 0) && ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) { | |
169 | int len; | |
170 | ||
171 | len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count; | |
172 | ||
d86d9b8c | 173 | if (viochar_is_console(pi)) |
8bff05b0 | 174 | HvCall_writeLogBuffer(buf, len); |
8bff05b0 SR |
175 | |
176 | init_data_event(viochar, pi->lp); | |
177 | ||
178 | viochar->len = len; | |
179 | viochar->event.xCorrelationToken = pi->seq++; | |
180 | viochar->event.xSizeMinus1 = | |
181 | offsetof(struct viocharlpevent, data) + len; | |
182 | ||
183 | memcpy(viochar->data, buf, len); | |
184 | ||
185 | hvrc = HvCallEvent_signalLpEvent(&viochar->event); | |
186 | if (hvrc) | |
187 | hvlog("\n\rerror sending event! return code %d\n\r", | |
188 | (int)hvrc); | |
189 | sent += len; | |
190 | count -= len; | |
191 | buf += len; | |
192 | } | |
193 | ||
194 | vio_free_event_buffer(viomajorsubtype_chario, viochar); | |
195 | done: | |
196 | spin_unlock_irqrestore(&consolelock, flags); | |
197 | return sent; | |
198 | } | |
199 | ||
200 | static struct hv_ops hvc_get_put_ops = { | |
201 | .get_chars = get_chars, | |
202 | .put_chars = put_chars, | |
203 | }; | |
204 | ||
205 | static int __devinit hvc_vio_probe(struct vio_dev *vdev, | |
206 | const struct vio_device_id *id) | |
207 | { | |
208 | struct hvc_struct *hp; | |
209 | struct port_info *pi; | |
210 | ||
211 | /* probed with invalid parameters. */ | |
212 | if (!vdev || !id) | |
213 | return -EPERM; | |
214 | ||
215 | if (vdev->unit_address >= VTTY_PORTS) | |
216 | return -ENODEV; | |
217 | ||
218 | pi = &port_info[vdev->unit_address]; | |
219 | ||
4e9e95a3 SR |
220 | hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops, |
221 | VIOCHAR_MAX_DATA); | |
8bff05b0 SR |
222 | if (IS_ERR(hp)) |
223 | return PTR_ERR(hp); | |
224 | pi->hp = hp; | |
225 | dev_set_drvdata(&vdev->dev, pi); | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static int __devexit hvc_vio_remove(struct vio_dev *vdev) | |
231 | { | |
232 | struct port_info *pi = dev_get_drvdata(&vdev->dev); | |
233 | struct hvc_struct *hp = pi->hp; | |
234 | ||
235 | return hvc_remove(hp); | |
236 | } | |
237 | ||
238 | static struct vio_driver hvc_vio_driver = { | |
239 | .id_table = hvc_driver_table, | |
240 | .probe = hvc_vio_probe, | |
241 | .remove = hvc_vio_remove, | |
242 | .driver = { | |
243 | .name = hvc_driver_name, | |
244 | .owner = THIS_MODULE, | |
245 | } | |
246 | }; | |
247 | ||
248 | static void hvc_open_event(struct HvLpEvent *event) | |
249 | { | |
250 | unsigned long flags; | |
251 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
252 | u8 port = cevent->virtual_device; | |
253 | struct port_info *pi; | |
254 | int reject = 0; | |
255 | ||
256 | if (hvlpevent_is_ack(event)) { | |
257 | if (port >= VTTY_PORTS) | |
258 | return; | |
259 | ||
260 | spin_lock_irqsave(&consolelock, flags); | |
261 | ||
262 | pi = &port_info[port]; | |
263 | if (event->xRc == HvLpEvent_Rc_Good) { | |
264 | pi->seq = pi->ack = 0; | |
265 | /* | |
266 | * This line allows connections from the primary | |
267 | * partition but once one is connected from the | |
268 | * primary partition nothing short of a reboot | |
269 | * of linux will allow access from the hosting | |
270 | * partition again without a required iSeries fix. | |
271 | */ | |
272 | pi->lp = event->xTargetLp; | |
273 | } | |
274 | ||
275 | spin_unlock_irqrestore(&consolelock, flags); | |
276 | if (event->xRc != HvLpEvent_Rc_Good) | |
277 | printk(KERN_WARNING | |
278 | "hvc: handle_open_event: event->xRc == (%d).\n", | |
279 | event->xRc); | |
280 | ||
281 | if (event->xCorrelationToken != 0) { | |
282 | atomic_t *aptr= (atomic_t *)event->xCorrelationToken; | |
283 | atomic_set(aptr, 1); | |
284 | } else | |
285 | printk(KERN_WARNING | |
286 | "hvc: weird...got open ack without atomic\n"); | |
287 | return; | |
288 | } | |
289 | ||
290 | /* This had better require an ack, otherwise complain */ | |
291 | if (!hvlpevent_need_ack(event)) { | |
292 | printk(KERN_WARNING "hvc: viocharopen without ack bit!\n"); | |
293 | return; | |
294 | } | |
295 | ||
296 | spin_lock_irqsave(&consolelock, flags); | |
297 | ||
298 | /* Make sure this is a good virtual tty */ | |
299 | if (port >= VTTY_PORTS) { | |
300 | event->xRc = HvLpEvent_Rc_SubtypeError; | |
301 | cevent->subtype_result_code = viorc_openRejected; | |
302 | /* | |
303 | * Flag state here since we can't printk while holding | |
304 | * the consolelock spinlock. | |
305 | */ | |
306 | reject = 1; | |
307 | } else { | |
308 | pi = &port_info[port]; | |
309 | if ((pi->lp != HvLpIndexInvalid) && | |
310 | (pi->lp != event->xSourceLp)) { | |
311 | /* | |
312 | * If this is tty is already connected to a different | |
313 | * partition, fail. | |
314 | */ | |
315 | event->xRc = HvLpEvent_Rc_SubtypeError; | |
316 | cevent->subtype_result_code = viorc_openRejected; | |
317 | reject = 2; | |
318 | } else { | |
319 | pi->lp = event->xSourceLp; | |
320 | event->xRc = HvLpEvent_Rc_Good; | |
321 | cevent->subtype_result_code = viorc_good; | |
322 | pi->seq = pi->ack = 0; | |
323 | } | |
324 | } | |
325 | ||
326 | spin_unlock_irqrestore(&consolelock, flags); | |
327 | ||
328 | if (reject == 1) | |
329 | printk(KERN_WARNING "hvc: open rejected: bad virtual tty.\n"); | |
330 | else if (reject == 2) | |
331 | printk(KERN_WARNING "hvc: open rejected: console in exclusive " | |
332 | "use by another partition.\n"); | |
333 | ||
334 | /* Return the acknowledgement */ | |
335 | HvCallEvent_ackLpEvent(event); | |
336 | } | |
337 | ||
338 | /* | |
339 | * Handle a close charLpEvent. This should ONLY be an Interrupt because the | |
340 | * virtual console should never actually issue a close event to the hypervisor | |
341 | * because the virtual console never goes away. A close event coming from the | |
342 | * hypervisor simply means that there are no client consoles connected to the | |
343 | * virtual console. | |
344 | */ | |
345 | static void hvc_close_event(struct HvLpEvent *event) | |
346 | { | |
347 | unsigned long flags; | |
348 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
349 | u8 port = cevent->virtual_device; | |
350 | ||
351 | if (!hvlpevent_is_int(event)) { | |
352 | printk(KERN_WARNING | |
353 | "hvc: got unexpected close acknowlegement\n"); | |
354 | return; | |
355 | } | |
356 | ||
357 | if (port >= VTTY_PORTS) { | |
358 | printk(KERN_WARNING | |
359 | "hvc: close message from invalid virtual device.\n"); | |
360 | return; | |
361 | } | |
362 | ||
363 | /* For closes, just mark the console partition invalid */ | |
364 | spin_lock_irqsave(&consolelock, flags); | |
365 | ||
366 | if (port_info[port].lp == event->xSourceLp) | |
367 | port_info[port].lp = HvLpIndexInvalid; | |
368 | ||
369 | spin_unlock_irqrestore(&consolelock, flags); | |
370 | } | |
371 | ||
372 | static void hvc_data_event(struct HvLpEvent *event) | |
373 | { | |
374 | unsigned long flags; | |
375 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
376 | struct port_info *pi; | |
377 | int n; | |
378 | u8 port = cevent->virtual_device; | |
379 | ||
380 | if (port >= VTTY_PORTS) { | |
381 | printk(KERN_WARNING "hvc: data on invalid virtual device %d\n", | |
382 | port); | |
383 | return; | |
384 | } | |
385 | if (cevent->len == 0) | |
386 | return; | |
387 | ||
388 | /* | |
389 | * Change 05/01/2003 - Ryan Arnold: If a partition other than | |
390 | * the current exclusive partition tries to send us data | |
391 | * events then just drop them on the floor because we don't | |
392 | * want his stinking data. He isn't authorized to receive | |
393 | * data because he wasn't the first one to get the console, | |
394 | * therefore he shouldn't be allowed to send data either. | |
395 | * This will work without an iSeries fix. | |
396 | */ | |
397 | pi = &port_info[port]; | |
398 | if (pi->lp != event->xSourceLp) | |
399 | return; | |
400 | ||
401 | spin_lock_irqsave(&consolelock, flags); | |
402 | ||
403 | n = IN_BUF_SIZE - pi->in_end; | |
404 | if (n > cevent->len) | |
405 | n = cevent->len; | |
406 | if (n > 0) { | |
407 | memcpy(&pi->in_buf[pi->in_end], cevent->data, n); | |
408 | pi->in_end += n; | |
409 | } | |
410 | spin_unlock_irqrestore(&consolelock, flags); | |
411 | if (n == 0) | |
412 | printk(KERN_WARNING "hvc: input buffer overflow\n"); | |
413 | } | |
414 | ||
415 | static void hvc_ack_event(struct HvLpEvent *event) | |
416 | { | |
417 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
418 | unsigned long flags; | |
419 | u8 port = cevent->virtual_device; | |
420 | ||
421 | if (port >= VTTY_PORTS) { | |
422 | printk(KERN_WARNING "hvc: data on invalid virtual device\n"); | |
423 | return; | |
424 | } | |
425 | ||
426 | spin_lock_irqsave(&consolelock, flags); | |
427 | port_info[port].ack = event->xCorrelationToken; | |
428 | spin_unlock_irqrestore(&consolelock, flags); | |
429 | } | |
430 | ||
431 | static void hvc_config_event(struct HvLpEvent *event) | |
432 | { | |
433 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; | |
434 | ||
435 | if (cevent->data[0] == 0x01) | |
436 | printk(KERN_INFO "hvc: window resized to %d: %d: %d: %d\n", | |
437 | cevent->data[1], cevent->data[2], | |
438 | cevent->data[3], cevent->data[4]); | |
439 | else | |
440 | printk(KERN_WARNING "hvc: unknown config event\n"); | |
441 | } | |
442 | ||
443 | static void hvc_handle_event(struct HvLpEvent *event) | |
444 | { | |
445 | int charminor; | |
446 | ||
447 | if (event == NULL) | |
448 | return; | |
449 | ||
450 | charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK; | |
451 | switch (charminor) { | |
452 | case viocharopen: | |
453 | hvc_open_event(event); | |
454 | break; | |
455 | case viocharclose: | |
456 | hvc_close_event(event); | |
457 | break; | |
458 | case viochardata: | |
459 | hvc_data_event(event); | |
460 | break; | |
461 | case viocharack: | |
462 | hvc_ack_event(event); | |
463 | break; | |
464 | case viocharconfig: | |
465 | hvc_config_event(event); | |
466 | break; | |
467 | default: | |
468 | if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { | |
469 | event->xRc = HvLpEvent_Rc_InvalidSubtype; | |
470 | HvCallEvent_ackLpEvent(event); | |
471 | } | |
472 | } | |
473 | } | |
474 | ||
475 | static int send_open(HvLpIndex remoteLp, void *sem) | |
476 | { | |
477 | return HvCallEvent_signalLpEventFast(remoteLp, | |
478 | HvLpEvent_Type_VirtualIo, | |
479 | viomajorsubtype_chario | viocharopen, | |
480 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
481 | viopath_sourceinst(remoteLp), | |
482 | viopath_targetinst(remoteLp), | |
483 | (u64)(unsigned long)sem, VIOVERSION << 16, | |
484 | 0, 0, 0, 0); | |
485 | } | |
486 | ||
487 | static int hvc_vio_init(void) | |
488 | { | |
489 | atomic_t wait_flag; | |
490 | int rc; | |
491 | ||
de0138da SR |
492 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
493 | return -EIO; | |
494 | ||
8bff05b0 SR |
495 | /* +2 for fudge */ |
496 | rc = viopath_open(HvLpConfig_getPrimaryLpIndex(), | |
497 | viomajorsubtype_chario, VIOCHAR_WINDOW + 2); | |
498 | if (rc) | |
499 | printk(KERN_WARNING "hvc: error opening to primary %d\n", rc); | |
500 | ||
501 | if (viopath_hostLp == HvLpIndexInvalid) | |
502 | vio_set_hostlp(); | |
503 | ||
504 | /* | |
505 | * And if the primary is not the same as the hosting LP, open to the | |
506 | * hosting lp | |
507 | */ | |
508 | if ((viopath_hostLp != HvLpIndexInvalid) && | |
509 | (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) { | |
510 | printk(KERN_INFO "hvc: open path to hosting (%d)\n", | |
511 | viopath_hostLp); | |
512 | rc = viopath_open(viopath_hostLp, viomajorsubtype_chario, | |
513 | VIOCHAR_WINDOW + 2); /* +2 for fudge */ | |
514 | if (rc) | |
515 | printk(KERN_WARNING | |
516 | "error opening to partition %d: %d\n", | |
517 | viopath_hostLp, rc); | |
518 | } | |
519 | ||
520 | if (vio_setHandler(viomajorsubtype_chario, hvc_handle_event) < 0) | |
521 | printk(KERN_WARNING | |
522 | "hvc: error seting handler for console events!\n"); | |
523 | ||
524 | /* | |
525 | * First, try to open the console to the hosting lp. | |
526 | * Wait on a semaphore for the response. | |
527 | */ | |
528 | atomic_set(&wait_flag, 0); | |
529 | if ((viopath_isactive(viopath_hostLp)) && | |
530 | (send_open(viopath_hostLp, &wait_flag) == 0)) { | |
531 | printk(KERN_INFO "hvc: hosting partition %d\n", viopath_hostLp); | |
532 | while (atomic_read(&wait_flag) == 0) | |
533 | mb(); | |
534 | atomic_set(&wait_flag, 0); | |
535 | } | |
536 | ||
537 | /* | |
538 | * If we don't have an active console, try the primary | |
539 | */ | |
540 | if ((!viopath_isactive(port_info[0].lp)) && | |
541 | (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) && | |
542 | (send_open(HvLpConfig_getPrimaryLpIndex(), &wait_flag) == 0)) { | |
543 | printk(KERN_INFO "hvc: opening console to primary partition\n"); | |
544 | while (atomic_read(&wait_flag) == 0) | |
545 | mb(); | |
546 | } | |
547 | ||
548 | /* Register as a vio device to receive callbacks */ | |
549 | rc = vio_register_driver(&hvc_vio_driver); | |
550 | ||
551 | return rc; | |
552 | } | |
553 | module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */ | |
554 | ||
555 | static void hvc_vio_exit(void) | |
556 | { | |
557 | vio_unregister_driver(&hvc_vio_driver); | |
558 | } | |
559 | module_exit(hvc_vio_exit); | |
560 | ||
561 | /* the device tree order defines our numbering */ | |
562 | static int hvc_find_vtys(void) | |
563 | { | |
564 | struct device_node *vty; | |
565 | int num_found = 0; | |
566 | ||
567 | for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL; | |
568 | vty = of_find_node_by_name(vty, "vty")) { | |
de0138da | 569 | const uint32_t *vtermno; |
8bff05b0 SR |
570 | |
571 | /* We have statically defined space for only a certain number | |
572 | * of console adapters. | |
573 | */ | |
574 | if ((num_found >= MAX_NR_HVC_CONSOLES) || | |
575 | (num_found >= VTTY_PORTS)) | |
576 | break; | |
577 | ||
de0138da | 578 | vtermno = get_property(vty, "reg", NULL); |
8bff05b0 SR |
579 | if (!vtermno) |
580 | continue; | |
581 | ||
582 | if (!device_is_compatible(vty, "IBM,iSeries-vty")) | |
583 | continue; | |
584 | ||
585 | if (num_found == 0) | |
586 | add_preferred_console("hvc", 0, NULL); | |
587 | hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops); | |
588 | ++num_found; | |
589 | } | |
590 | ||
591 | return num_found; | |
592 | } | |
593 | console_initcall(hvc_find_vtys); |