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10#include <linux/module.h>
11#include <linux/kmod.h>
12#include <linux/tty.h>
13#include <linux/tty_driver.h>
14#include <linux/tty_flip.h>
15#include <linux/err.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/gfp.h>
19#include <asm/uaccess.h>
20
21#include "ctrlchar.h"
22#include "sclp.h"
23#include "sclp_rw.h"
24#include "sclp_tty.h"
25
26
27
28
29
30#define SCLP_TTY_BUF_SIZE 512
31
32
33
34
35
36
37
38static spinlock_t sclp_tty_lock;
39
40static struct list_head sclp_tty_pages;
41
42static struct list_head sclp_tty_outqueue;
43
44static int sclp_tty_buffer_count;
45
46static struct sclp_buffer *sclp_ttybuf;
47
48static struct timer_list sclp_tty_timer;
49
50static struct tty_port sclp_port;
51static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
52static unsigned short int sclp_tty_chars_count;
53
54struct tty_driver *sclp_tty_driver;
55
56static int sclp_tty_tolower;
57static int sclp_tty_columns = 80;
58
59#define SPACES_PER_TAB 8
60#define CASE_DELIMITER 0x6c
61
62
63static int
64sclp_tty_open(struct tty_struct *tty, struct file *filp)
65{
66 tty_port_tty_set(&sclp_port, tty);
67 tty->driver_data = NULL;
68 sclp_port.low_latency = 0;
69 return 0;
70}
71
72
73static void
74sclp_tty_close(struct tty_struct *tty, struct file *filp)
75{
76 if (tty->count > 1)
77 return;
78 tty_port_tty_set(&sclp_port, NULL);
79}
80
81
82
83
84
85
86
87
88
89
90static int
91sclp_tty_write_room (struct tty_struct *tty)
92{
93 unsigned long flags;
94 struct list_head *l;
95 int count;
96
97 spin_lock_irqsave(&sclp_tty_lock, flags);
98 count = 0;
99 if (sclp_ttybuf != NULL)
100 count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct mto);
101 list_for_each(l, &sclp_tty_pages)
102 count += NR_EMPTY_MTO_PER_SCCB;
103 spin_unlock_irqrestore(&sclp_tty_lock, flags);
104 return count;
105}
106
107static void
108sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
109{
110 unsigned long flags;
111 void *page;
112
113 do {
114 page = sclp_unmake_buffer(buffer);
115 spin_lock_irqsave(&sclp_tty_lock, flags);
116
117 list_del(&buffer->list);
118 sclp_tty_buffer_count--;
119 list_add_tail((struct list_head *) page, &sclp_tty_pages);
120
121 buffer = NULL;
122 if (!list_empty(&sclp_tty_outqueue))
123 buffer = list_entry(sclp_tty_outqueue.next,
124 struct sclp_buffer, list);
125 spin_unlock_irqrestore(&sclp_tty_lock, flags);
126 } while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback));
127
128 tty_port_tty_wakeup(&sclp_port);
129}
130
131static inline void
132__sclp_ttybuf_emit(struct sclp_buffer *buffer)
133{
134 unsigned long flags;
135 int count;
136 int rc;
137
138 spin_lock_irqsave(&sclp_tty_lock, flags);
139 list_add_tail(&buffer->list, &sclp_tty_outqueue);
140 count = sclp_tty_buffer_count++;
141 spin_unlock_irqrestore(&sclp_tty_lock, flags);
142 if (count)
143 return;
144 rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback);
145 if (rc)
146 sclp_ttybuf_callback(buffer, rc);
147}
148
149
150
151
152
153static void
154sclp_tty_timeout(unsigned long data)
155{
156 unsigned long flags;
157 struct sclp_buffer *buf;
158
159 spin_lock_irqsave(&sclp_tty_lock, flags);
160 buf = sclp_ttybuf;
161 sclp_ttybuf = NULL;
162 spin_unlock_irqrestore(&sclp_tty_lock, flags);
163
164 if (buf != NULL) {
165 __sclp_ttybuf_emit(buf);
166 }
167}
168
169
170
171
172static int sclp_tty_write_string(const unsigned char *str, int count, int may_fail)
173{
174 unsigned long flags;
175 void *page;
176 int written;
177 int overall_written;
178 struct sclp_buffer *buf;
179
180 if (count <= 0)
181 return 0;
182 overall_written = 0;
183 spin_lock_irqsave(&sclp_tty_lock, flags);
184 do {
185
186 if (sclp_ttybuf == NULL) {
187 while (list_empty(&sclp_tty_pages)) {
188 spin_unlock_irqrestore(&sclp_tty_lock, flags);
189 if (may_fail)
190 goto out;
191 else
192 sclp_sync_wait();
193 spin_lock_irqsave(&sclp_tty_lock, flags);
194 }
195 page = sclp_tty_pages.next;
196 list_del((struct list_head *) page);
197 sclp_ttybuf = sclp_make_buffer(page, sclp_tty_columns,
198 SPACES_PER_TAB);
199 }
200
201 written = sclp_write(sclp_ttybuf, str, count);
202 overall_written += written;
203 if (written == count)
204 break;
205
206
207
208
209
210 buf = sclp_ttybuf;
211 sclp_ttybuf = NULL;
212 spin_unlock_irqrestore(&sclp_tty_lock, flags);
213 __sclp_ttybuf_emit(buf);
214 spin_lock_irqsave(&sclp_tty_lock, flags);
215 str += written;
216 count -= written;
217 } while (count > 0);
218
219 if (sclp_ttybuf && sclp_chars_in_buffer(sclp_ttybuf) &&
220 !timer_pending(&sclp_tty_timer)) {
221 init_timer(&sclp_tty_timer);
222 sclp_tty_timer.function = sclp_tty_timeout;
223 sclp_tty_timer.data = 0UL;
224 sclp_tty_timer.expires = jiffies + HZ/10;
225 add_timer(&sclp_tty_timer);
226 }
227 spin_unlock_irqrestore(&sclp_tty_lock, flags);
228out:
229 return overall_written;
230}
231
232
233
234
235
236
237static int
238sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
239{
240 if (sclp_tty_chars_count > 0) {
241 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
242 sclp_tty_chars_count = 0;
243 }
244 return sclp_tty_write_string(buf, count, 1);
245}
246
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254
255
256
257static int
258sclp_tty_put_char(struct tty_struct *tty, unsigned char ch)
259{
260 sclp_tty_chars[sclp_tty_chars_count++] = ch;
261 if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) {
262 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
263 sclp_tty_chars_count = 0;
264 }
265 return 1;
266}
267
268
269
270
271
272static void
273sclp_tty_flush_chars(struct tty_struct *tty)
274{
275 if (sclp_tty_chars_count > 0) {
276 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
277 sclp_tty_chars_count = 0;
278 }
279}
280
281
282
283
284
285
286
287
288static int
289sclp_tty_chars_in_buffer(struct tty_struct *tty)
290{
291 unsigned long flags;
292 struct list_head *l;
293 struct sclp_buffer *t;
294 int count;
295
296 spin_lock_irqsave(&sclp_tty_lock, flags);
297 count = 0;
298 if (sclp_ttybuf != NULL)
299 count = sclp_chars_in_buffer(sclp_ttybuf);
300 list_for_each(l, &sclp_tty_outqueue) {
301 t = list_entry(l, struct sclp_buffer, list);
302 count += sclp_chars_in_buffer(t);
303 }
304 spin_unlock_irqrestore(&sclp_tty_lock, flags);
305 return count;
306}
307
308
309
310
311static void
312sclp_tty_flush_buffer(struct tty_struct *tty)
313{
314 if (sclp_tty_chars_count > 0) {
315 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
316 sclp_tty_chars_count = 0;
317 }
318}
319
320
321
322
323static void
324sclp_tty_input(unsigned char* buf, unsigned int count)
325{
326 struct tty_struct *tty = tty_port_tty_get(&sclp_port);
327 unsigned int cchar;
328
329
330
331
332
333 if (tty == NULL)
334 return;
335 cchar = ctrlchar_handle(buf, count, tty);
336 switch (cchar & CTRLCHAR_MASK) {
337 case CTRLCHAR_SYSRQ:
338 break;
339 case CTRLCHAR_CTRL:
340 tty_insert_flip_char(&sclp_port, cchar, TTY_NORMAL);
341 tty_flip_buffer_push(&sclp_port);
342 break;
343 case CTRLCHAR_NONE:
344
345 if (count < 2 ||
346 (strncmp((const char *) buf + count - 2, "^n", 2) &&
347 strncmp((const char *) buf + count - 2, "\252n", 2))) {
348
349 tty_insert_flip_string(&sclp_port, buf, count);
350 tty_insert_flip_char(&sclp_port, '\n', TTY_NORMAL);
351 } else
352 tty_insert_flip_string(&sclp_port, buf, count - 2);
353 tty_flip_buffer_push(&sclp_port);
354 break;
355 }
356 tty_kref_put(tty);
357}
358
359
360
361
362
363
364
365static int sclp_switch_cases(unsigned char *buf, int count)
366{
367 unsigned char *ip, *op;
368 int toggle;
369
370
371 toggle = 0;
372 ip = op = buf;
373 while (count-- > 0) {
374
375 if (*ip == CASE_DELIMITER) {
376
377 if (count && ip[1] == CASE_DELIMITER) {
378
379
380
381
382 *op++ = *ip++;
383 count--;
384 } else
385
386
387
388
389 toggle = ~toggle;
390
391 ip++;
392 } else
393
394 if (toggle)
395
396 if (sclp_tty_tolower)
397
398 *op++ = _ebc_toupper[(int) *ip++];
399 else
400
401 *op++ = _ebc_tolower[(int) *ip++];
402 else
403
404 *op++ = *ip++;
405 }
406
407 return op - buf;
408}
409
410static void sclp_get_input(struct gds_subvector *sv)
411{
412 unsigned char *str;
413 int count;
414
415 str = (unsigned char *) (sv + 1);
416 count = sv->length - sizeof(*sv);
417 if (sclp_tty_tolower)
418 EBC_TOLOWER(str, count);
419 count = sclp_switch_cases(str, count);
420
421 sclp_ebcasc_str(str, count);
422
423
424 sclp_tty_input(str, count);
425}
426
427static inline void sclp_eval_selfdeftextmsg(struct gds_subvector *sv)
428{
429 void *end;
430
431 end = (void *) sv + sv->length;
432 for (sv = sv + 1; (void *) sv < end; sv = (void *) sv + sv->length)
433 if (sv->key == 0x30)
434 sclp_get_input(sv);
435}
436
437static inline void sclp_eval_textcmd(struct gds_vector *v)
438{
439 struct gds_subvector *sv;
440 void *end;
441
442 end = (void *) v + v->length;
443 for (sv = (struct gds_subvector *) (v + 1);
444 (void *) sv < end; sv = (void *) sv + sv->length)
445 if (sv->key == GDS_KEY_SELFDEFTEXTMSG)
446 sclp_eval_selfdeftextmsg(sv);
447
448}
449
450static inline void sclp_eval_cpmsu(struct gds_vector *v)
451{
452 void *end;
453
454 end = (void *) v + v->length;
455 for (v = v + 1; (void *) v < end; v = (void *) v + v->length)
456 if (v->gds_id == GDS_ID_TEXTCMD)
457 sclp_eval_textcmd(v);
458}
459
460
461static inline void sclp_eval_mdsmu(struct gds_vector *v)
462{
463 v = sclp_find_gds_vector(v + 1, (void *) v + v->length, GDS_ID_CPMSU);
464 if (v)
465 sclp_eval_cpmsu(v);
466}
467
468static void sclp_tty_receiver(struct evbuf_header *evbuf)
469{
470 struct gds_vector *v;
471
472 v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length,
473 GDS_ID_MDSMU);
474 if (v)
475 sclp_eval_mdsmu(v);
476}
477
478static void
479sclp_tty_state_change(struct sclp_register *reg)
480{
481}
482
483static struct sclp_register sclp_input_event =
484{
485 .receive_mask = EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK,
486 .state_change_fn = sclp_tty_state_change,
487 .receiver_fn = sclp_tty_receiver
488};
489
490static const struct tty_operations sclp_ops = {
491 .open = sclp_tty_open,
492 .close = sclp_tty_close,
493 .write = sclp_tty_write,
494 .put_char = sclp_tty_put_char,
495 .flush_chars = sclp_tty_flush_chars,
496 .write_room = sclp_tty_write_room,
497 .chars_in_buffer = sclp_tty_chars_in_buffer,
498 .flush_buffer = sclp_tty_flush_buffer,
499};
500
501static int __init
502sclp_tty_init(void)
503{
504 struct tty_driver *driver;
505 void *page;
506 int i;
507 int rc;
508
509 if (!CONSOLE_IS_SCLP)
510 return 0;
511 driver = alloc_tty_driver(1);
512 if (!driver)
513 return -ENOMEM;
514
515 rc = sclp_rw_init();
516 if (rc) {
517 put_tty_driver(driver);
518 return rc;
519 }
520
521 INIT_LIST_HEAD(&sclp_tty_pages);
522 for (i = 0; i < MAX_KMEM_PAGES; i++) {
523 page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
524 if (page == NULL) {
525 put_tty_driver(driver);
526 return -ENOMEM;
527 }
528 list_add_tail((struct list_head *) page, &sclp_tty_pages);
529 }
530 INIT_LIST_HEAD(&sclp_tty_outqueue);
531 spin_lock_init(&sclp_tty_lock);
532 init_timer(&sclp_tty_timer);
533 sclp_ttybuf = NULL;
534 sclp_tty_buffer_count = 0;
535 if (MACHINE_IS_VM) {
536
537
538
539
540 sclp_tty_columns = 76;
541
542 sclp_tty_tolower = 1;
543 }
544 sclp_tty_chars_count = 0;
545
546 rc = sclp_register(&sclp_input_event);
547 if (rc) {
548 put_tty_driver(driver);
549 return rc;
550 }
551
552 tty_port_init(&sclp_port);
553
554 driver->driver_name = "sclp_line";
555 driver->name = "sclp_line";
556 driver->major = TTY_MAJOR;
557 driver->minor_start = 64;
558 driver->type = TTY_DRIVER_TYPE_SYSTEM;
559 driver->subtype = SYSTEM_TYPE_TTY;
560 driver->init_termios = tty_std_termios;
561 driver->init_termios.c_iflag = IGNBRK | IGNPAR;
562 driver->init_termios.c_oflag = ONLCR | XTABS;
563 driver->init_termios.c_lflag = ISIG | ECHO;
564 driver->flags = TTY_DRIVER_REAL_RAW;
565 tty_set_operations(driver, &sclp_ops);
566 tty_port_link_device(&sclp_port, driver, 0);
567 rc = tty_register_driver(driver);
568 if (rc) {
569 put_tty_driver(driver);
570 tty_port_destroy(&sclp_port);
571 return rc;
572 }
573 sclp_tty_driver = driver;
574 return 0;
575}
576module_init(sclp_tty_init);
577