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   1 /*
   2  *  drivers/s390/char/sclp_tty.c
   3  *    SCLP line mode terminal driver.
   4  *
   5  *  S390 version
   6  *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *    Author(s): Martin Peschke <mpeschke@de.ibm.com>
   8  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kmod.h>
  13 #include <linux/tty.h>
  14 #include <linux/tty_driver.h>
  15 #include <linux/tty_flip.h>
  16 #include <linux/sched.h>
  17 #include <linux/wait.h>
  18 #include <linux/slab.h>
  19 #include <linux/err.h>
  20 #include <linux/init.h>
  21 #include <linux/interrupt.h>
  22 #include <asm/uaccess.h>
  23
  24 #include "ctrlchar.h"
  25 #include "sclp.h"
  26 #include "sclp_rw.h"
  27 #include "sclp_tty.h"
  28
  29 #define SCLP_TTY_PRINT_HEADER "sclp tty driver: "
  30
  31 /*
  32  * size of a buffer that collects single characters coming in
  33  * via sclp_tty_put_char()
  34  */
  35 #define SCLP_TTY_BUF_SIZE 512
  36
  37 /*
  38  * There is exactly one SCLP terminal, so we can keep things simple
  39  * and allocate all variables statically.
  40  */
  41
  42 /* Lock to guard over changes to global variables. */
  43 static spinlock_t sclp_tty_lock;
  44 /* List of free pages that can be used for console output buffering. */
  45 static struct list_head sclp_tty_pages;
  46 /* List of full struct sclp_buffer structures ready for output. */
  47 static struct list_head sclp_tty_outqueue;
  48 /* Counter how many buffers are emitted. */
  49 static int sclp_tty_buffer_count;
  50 /* Pointer to current console buffer. */
  51 static struct sclp_buffer *sclp_ttybuf;
  52 /* Timer for delayed output of console messages. */
  53 static struct timer_list sclp_tty_timer;
  54 /* Waitqueue to wait for buffers to get empty. */
  55 static wait_queue_head_t sclp_tty_waitq;
  56
  57 static struct tty_struct *sclp_tty;
  58 static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
  59 static unsigned short int sclp_tty_chars_count;
  60
  61 struct tty_driver *sclp_tty_driver;
  62
  63 static struct sclp_ioctls sclp_ioctls;
  64 static struct sclp_ioctls sclp_ioctls_init =
  65 {
  66         8,                      /* 1 hor. tab. = 8 spaces */
  67         0,                      /* no echo of input by this driver */
  68         80,                     /* 80 characters/line */
  69         1,                      /* write after 1/10 s without final new line */
  70         MAX_KMEM_PAGES,         /* quick fix: avoid __alloc_pages */
  71         MAX_KMEM_PAGES,         /* take 32/64 pages from kernel memory, */
  72         0,                      /* do not convert to lower case */
  73         0x6c                    /* to seprate upper and lower case */
  74                                 /* ('%' in EBCDIC) */
  75 };
  76
  77 /* This routine is called whenever we try to open a SCLP terminal. */
  78 static int
  79 sclp_tty_open(struct tty_struct *tty, struct file *filp)
  80 {
  81         sclp_tty = tty;
  82         tty->driver_data = NULL;
  83         tty->low_latency = 0;
  84         return 0;
  85 }
  86
  87 /* This routine is called when the SCLP terminal is closed. */
  88 static void
  89 sclp_tty_close(struct tty_struct *tty, struct file *filp)
  90 {
  91         if (tty->count > 1)
  92                 return;
  93         sclp_tty = NULL;
  94 }
  95
  96 /* execute commands to control the i/o behaviour of the SCLP tty at runtime */
  97 static int
  98 sclp_tty_ioctl(struct tty_struct *tty, struct file * file,
  99                unsigned int cmd, unsigned long arg)
 100 {
 101         unsigned long flags;
 102         unsigned int obuf;
 103         int check;
 104         int rc;
 105
 106         if (tty->flags & (1 << TTY_IO_ERROR))
 107                 return -EIO;
 108         rc = 0;
 109         check = 0;
 110         switch (cmd) {
 111         case TIOCSCLPSHTAB:
 112                 /* set width of horizontal tab  */
 113                 if (get_user(sclp_ioctls.htab, (unsigned short __user *) arg))
 114                         rc = -EFAULT;
 115                 else
 116                         check = 1;
 117                 break;
 118         case TIOCSCLPGHTAB:
 119                 /* get width of horizontal tab  */
 120                 if (put_user(sclp_ioctls.htab, (unsigned short __user *) arg))
 121                         rc = -EFAULT;
 122                 break;
 123         case TIOCSCLPSECHO:
 124                 /* enable/disable echo of input */
 125                 if (get_user(sclp_ioctls.echo, (unsigned char __user *) arg))
 126                         rc = -EFAULT;
 127                 break;
 128         case TIOCSCLPGECHO:
 129                 /* Is echo of input enabled ?  */
 130                 if (put_user(sclp_ioctls.echo, (unsigned char __user *) arg))
 131                         rc = -EFAULT;
 132                 break;
 133         case TIOCSCLPSCOLS:
 134                 /* set number of columns for output  */
 135                 if (get_user(sclp_ioctls.columns, (unsigned short __user *) arg))
 136                         rc = -EFAULT;
 137                 else
 138                         check = 1;
 139                 break;
 140         case TIOCSCLPGCOLS:
 141                 /* get number of columns for output  */
 142                 if (put_user(sclp_ioctls.columns, (unsigned short __user *) arg))
 143                         rc = -EFAULT;
 144                 break;
 145         case TIOCSCLPSNL:
 146                 /* enable/disable writing without final new line character  */
 147                 if (get_user(sclp_ioctls.final_nl, (signed char __user *) arg))
 148                         rc = -EFAULT;
 149                 break;
 150         case TIOCSCLPGNL:
 151                 /* Is writing without final new line character enabled ?  */
 152                 if (put_user(sclp_ioctls.final_nl, (signed char __user *) arg))
 153                         rc = -EFAULT;
 154                 break;
 155         case TIOCSCLPSOBUF:
 156                 /*
 157                  * set the maximum buffers size for output, will be rounded
 158                  * up to next 4kB boundary and stored as number of SCCBs
 159                  * (4kB Buffers) limitation: 256 x 4kB
 160                  */
 161                 if (get_user(obuf, (unsigned int __user *) arg) == 0) {
 162                         if (obuf & 0xFFF)
 163                                 sclp_ioctls.max_sccb = (obuf >> 12) + 1;
 164                         else
 165                                 sclp_ioctls.max_sccb = (obuf >> 12);
 166                 } else
 167                         rc = -EFAULT;
 168                 break;
 169         case TIOCSCLPGOBUF:
 170                 /* get the maximum buffers size for output  */
 171                 obuf = sclp_ioctls.max_sccb << 12;
 172                 if (put_user(obuf, (unsigned int __user *) arg))
 173                         rc = -EFAULT;
 174                 break;
 175         case TIOCSCLPGKBUF:
 176                 /* get the number of buffers got from kernel at startup */
 177                 if (put_user(sclp_ioctls.kmem_sccb, (unsigned short __user *) arg))
 178                         rc = -EFAULT;
 179                 break;
 180         case TIOCSCLPSCASE:
 181                 /* enable/disable conversion from upper to lower case */
 182                 if (get_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
 183                         rc = -EFAULT;
 184                 break;
 185         case TIOCSCLPGCASE:
 186                 /* Is conversion from upper to lower case of input enabled? */
 187                 if (put_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
 188                         rc = -EFAULT;
 189                 break;
 190         case TIOCSCLPSDELIM:
 191                 /*
 192                  * set special character used for separating upper and
 193                  * lower case, 0x00 disables this feature
 194                  */
 195                 if (get_user(sclp_ioctls.delim, (unsigned char __user *) arg))
 196                         rc = -EFAULT;
 197                 break;
 198         case TIOCSCLPGDELIM:
 199                 /*
 200                  * get special character used for separating upper and
 201                  * lower case, 0x00 disables this feature
 202                  */
 203                 if (put_user(sclp_ioctls.delim, (unsigned char __user *) arg))
 204                         rc = -EFAULT;
 205                 break;
 206         case TIOCSCLPSINIT:
 207                 /* set initial (default) sclp ioctls  */
 208                 sclp_ioctls = sclp_ioctls_init;
 209                 check = 1;
 210                 break;
 211         default:
 212                 rc = -ENOIOCTLCMD;
 213                 break;
 214         }
 215         if (check) {
 216                 spin_lock_irqsave(&sclp_tty_lock, flags);
 217                 if (sclp_ttybuf != NULL) {
 218                         sclp_set_htab(sclp_ttybuf, sclp_ioctls.htab);
 219                         sclp_set_columns(sclp_ttybuf, sclp_ioctls.columns);
 220                 }
 221                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
 222         }
 223         return rc;
 224 }
 225
 226 /*
 227  * This routine returns the numbers of characters the tty driver
 228  * will accept for queuing to be written.  This number is subject
 229  * to change as output buffers get emptied, or if the output flow
 230  * control is acted. This is not an exact number because not every
 231  * character needs the same space in the sccb. The worst case is
 232  * a string of newlines. Every newlines creates a new mto which
 233  * needs 8 bytes.
 234  */
 235 static int
 236 sclp_tty_write_room (struct tty_struct *tty)
 237 {
 238         unsigned long flags;
 239         struct list_head *l;
 240         int count;
 241
 242         spin_lock_irqsave(&sclp_tty_lock, flags);
 243         count = 0;
 244         if (sclp_ttybuf != NULL)
 245                 count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct mto);
 246         list_for_each(l, &sclp_tty_pages)
 247                 count += NR_EMPTY_MTO_PER_SCCB;
 248         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 249         return count;
 250 }
 251
 252 static void
 253 sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
 254 {
 255         unsigned long flags;
 256         void *page;
 257
 258         do {
 259                 page = sclp_unmake_buffer(buffer);
 260                 spin_lock_irqsave(&sclp_tty_lock, flags);
 261                 /* Remove buffer from outqueue */
 262                 list_del(&buffer->list);
 263                 sclp_tty_buffer_count--;
 264                 list_add_tail((struct list_head *) page, &sclp_tty_pages);
 265                 /* Check if there is a pending buffer on the out queue. */
 266                 buffer = NULL;
 267                 if (!list_empty(&sclp_tty_outqueue))
 268                         buffer = list_entry(sclp_tty_outqueue.next,
 269                                             struct sclp_buffer, list);
 270                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
 271         } while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback));
 272         wake_up(&sclp_tty_waitq);
 273         /* check if the tty needs a wake up call */
 274         if (sclp_tty != NULL) {
 275                 tty_wakeup(sclp_tty);
 276         }
 277 }
 278
 279 static inline void
 280 __sclp_ttybuf_emit(struct sclp_buffer *buffer)
 281 {
 282         unsigned long flags;
 283         int count;
 284         int rc;
 285
 286         spin_lock_irqsave(&sclp_tty_lock, flags);
 287         list_add_tail(&buffer->list, &sclp_tty_outqueue);
 288         count = sclp_tty_buffer_count++;
 289         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 290         if (count)
 291                 return;
 292         rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback);
 293         if (rc)
 294                 sclp_ttybuf_callback(buffer, rc);
 295 }
 296
 297 /*
 298  * When this routine is called from the timer then we flush the
 299  * temporary write buffer.
 300  */
 301 static void
 302 sclp_tty_timeout(unsigned long data)
 303 {
 304         unsigned long flags;
 305         struct sclp_buffer *buf;
 306
 307         spin_lock_irqsave(&sclp_tty_lock, flags);
 308         buf = sclp_ttybuf;
 309         sclp_ttybuf = NULL;
 310         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 311
 312         if (buf != NULL) {
 313                 __sclp_ttybuf_emit(buf);
 314         }
 315 }
 316
 317 /*
 318  * Write a string to the sclp tty.
 319  */
 320 static void
 321 sclp_tty_write_string(const unsigned char *str, int count)
 322 {
 323         unsigned long flags;
 324         void *page;
 325         int written;
 326         struct sclp_buffer *buf;
 327
 328         if (count <= 0)
 329                 return;
 330         spin_lock_irqsave(&sclp_tty_lock, flags);
 331         do {
 332                 /* Create a sclp output buffer if none exists yet */
 333                 if (sclp_ttybuf == NULL) {
 334                         while (list_empty(&sclp_tty_pages)) {
 335                                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
 336                                 if (in_interrupt())
 337                                         sclp_sync_wait();
 338                                 else
 339                                         wait_event(sclp_tty_waitq,
 340                                                 !list_empty(&sclp_tty_pages));
 341                                 spin_lock_irqsave(&sclp_tty_lock, flags);
 342                         }
 343                         page = sclp_tty_pages.next;
 344                         list_del((struct list_head *) page);
 345                         sclp_ttybuf = sclp_make_buffer(page,
 346                                                        sclp_ioctls.columns,
 347                                                        sclp_ioctls.htab);
 348                 }
 349                 /* try to write the string to the current output buffer */
 350                 written = sclp_write(sclp_ttybuf, str, count);
 351                 if (written == count)
 352                         break;
 353                 /*
 354                  * Not all characters could be written to the current
 355                  * output buffer. Emit the buffer, create a new buffer
 356                  * and then output the rest of the string.
 357                  */
 358                 buf = sclp_ttybuf;
 359                 sclp_ttybuf = NULL;
 360                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
 361                 __sclp_ttybuf_emit(buf);
 362                 spin_lock_irqsave(&sclp_tty_lock, flags);
 363                 str += written;
 364                 count -= written;
 365         } while (count > 0);
 366         /* Setup timer to output current console buffer after 1/10 second */
 367         if (sclp_ioctls.final_nl) {
 368                 if (sclp_ttybuf != NULL &&
 369                     sclp_chars_in_buffer(sclp_ttybuf) != 0 &&
 370                     !timer_pending(&sclp_tty_timer)) {
 371                         init_timer(&sclp_tty_timer);
 372                         sclp_tty_timer.function = sclp_tty_timeout;
 373                         sclp_tty_timer.data = 0UL;
 374                         sclp_tty_timer.expires = jiffies + HZ/10;
 375                         add_timer(&sclp_tty_timer);
 376                 }
 377         } else {
 378                 if (sclp_ttybuf != NULL &&
 379                     sclp_chars_in_buffer(sclp_ttybuf) != 0) {
 380                         buf = sclp_ttybuf;
 381                         sclp_ttybuf = NULL;
 382                         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 383                         __sclp_ttybuf_emit(buf);
 384                         spin_lock_irqsave(&sclp_tty_lock, flags);
 385                 }
 386         }
 387         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 388 }
 389
 390 /*
 391  * This routine is called by the kernel to write a series of characters to the
 392  * tty device. The characters may come from user space or kernel space. This
 393  * routine will return the number of characters actually accepted for writing.
 394  */
 395 static int
 396 sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
 397 {
 398         if (sclp_tty_chars_count > 0) {
 399                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
 400                 sclp_tty_chars_count = 0;
 401         }
 402         sclp_tty_write_string(buf, count);
 403         return count;
 404 }
 405
 406 /*
 407  * This routine is called by the kernel to write a single character to the tty
 408  * device. If the kernel uses this routine, it must call the flush_chars()
 409  * routine (if defined) when it is done stuffing characters into the driver.
 410  *
 411  * Characters provided to sclp_tty_put_char() are buffered by the SCLP driver.
 412  * If the given character is a '\n' the contents of the SCLP write buffer
 413  * - including previous characters from sclp_tty_put_char() and strings from
 414  * sclp_write() without final '\n' - will be written.
 415  */
 416 static void
 417 sclp_tty_put_char(struct tty_struct *tty, unsigned char ch)
 418 {
 419         sclp_tty_chars[sclp_tty_chars_count++] = ch;
 420         if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) {
 421                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
 422                 sclp_tty_chars_count = 0;
 423         }
 424 }
 425
 426 /*
 427  * This routine is called by the kernel after it has written a series of
 428  * characters to the tty device using put_char().
 429  */
 430 static void
 431 sclp_tty_flush_chars(struct tty_struct *tty)
 432 {
 433         if (sclp_tty_chars_count > 0) {
 434                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
 435                 sclp_tty_chars_count = 0;
 436         }
 437 }
 438
 439 /*
 440  * This routine returns the number of characters in the write buffer of the
 441  * SCLP driver. The provided number includes all characters that are stored
 442  * in the SCCB (will be written next time the SCLP is not busy) as well as
 443  * characters in the write buffer (will not be written as long as there is a
 444  * final line feed missing).
 445  */
 446 static int
 447 sclp_tty_chars_in_buffer(struct tty_struct *tty)
 448 {
 449         unsigned long flags;
 450         struct list_head *l;
 451         struct sclp_buffer *t;
 452         int count;
 453
 454         spin_lock_irqsave(&sclp_tty_lock, flags);
 455         count = 0;
 456         if (sclp_ttybuf != NULL)
 457                 count = sclp_chars_in_buffer(sclp_ttybuf);
 458         list_for_each(l, &sclp_tty_outqueue) {
 459                 t = list_entry(l, struct sclp_buffer, list);
 460                 count += sclp_chars_in_buffer(t);
 461         }
 462         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 463         return count;
 464 }
 465
 466 /*
 467  * removes all content from buffers of low level driver
 468  */
 469 static void
 470 sclp_tty_flush_buffer(struct tty_struct *tty)
 471 {
 472         if (sclp_tty_chars_count > 0) {
 473                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
 474                 sclp_tty_chars_count = 0;
 475         }
 476 }
 477
 478 /*
 479  * push input to tty
 480  */
 481 static void
 482 sclp_tty_input(unsigned char* buf, unsigned int count)
 483 {
 484         unsigned int cchar;
 485
 486         /*
 487          * If this tty driver is currently closed
 488          * then throw the received input away.
 489          */
 490         if (sclp_tty == NULL)
 491                 return;
 492         cchar = ctrlchar_handle(buf, count, sclp_tty);
 493         switch (cchar & CTRLCHAR_MASK) {
 494         case CTRLCHAR_SYSRQ:
 495                 break;
 496         case CTRLCHAR_CTRL:
 497                 tty_insert_flip_char(sclp_tty, cchar, TTY_NORMAL);
 498                 tty_flip_buffer_push(sclp_tty);
 499                 break;
 500         case CTRLCHAR_NONE:
 501                 /* send (normal) input to line discipline */
 502                 if (count < 2 ||
 503                     (strncmp((const char *) buf + count - 2, "^n", 2) &&
 504                      strncmp((const char *) buf + count - 2, "\252n", 2))) {
 505                         /* add the auto \n */
 506                         tty_insert_flip_string(sclp_tty, buf, count);
 507                         tty_insert_flip_char(sclp_tty, '\n', TTY_NORMAL);
 508                 } else
 509                         tty_insert_flip_string(sclp_tty, buf, count - 2);
 510                 tty_flip_buffer_push(sclp_tty);
 511                 break;
 512         }
 513 }
 514
 515 /*
 516  * get a EBCDIC string in upper/lower case,
 517  * find out characters in lower/upper case separated by a special character,
 518  * modifiy original string,
 519  * returns length of resulting string
 520  */
 521 static int
 522 sclp_switch_cases(unsigned char *buf, int count,
 523                   unsigned char delim, int tolower)
 524 {
 525         unsigned char *ip, *op;
 526         int toggle;
 527
 528         /* initially changing case is off */
 529         toggle = 0;
 530         ip = op = buf;
 531         while (count-- > 0) {
 532                 /* compare with special character */
 533                 if (*ip == delim) {
 534                         /* followed by another special character? */
 535                         if (count && ip[1] == delim) {
 536                                 /*
 537                                  * ... then put a single copy of the special
 538                                  * character to the output string
 539                                  */
 540                                 *op++ = *ip++;
 541                                 count--;
 542                         } else
 543                                 /*
 544                                  * ... special character follower by a normal
 545                                  * character toggles the case change behaviour
 546                                  */
 547                                 toggle = ~toggle;
 548                         /* skip special character */
 549                         ip++;
 550                 } else
 551                         /* not the special character */
 552                         if (toggle)
 553                                 /* but case switching is on */
 554                                 if (tolower)
 555                                         /* switch to uppercase */
 556                                         *op++ = _ebc_toupper[(int) *ip++];
 557                                 else
 558                                         /* switch to lowercase */
 559                                         *op++ = _ebc_tolower[(int) *ip++];
 560                         else
 561                                 /* no case switching, copy the character */
 562                                 *op++ = *ip++;
 563         }
 564         /* return length of reformatted string. */
 565         return op - buf;
 566 }
 567
 568 static void
 569 sclp_get_input(unsigned char *start, unsigned char *end)
 570 {
 571         int count;
 572
 573         count = end - start;
 574         /*
 575          * if set in ioctl convert EBCDIC to lower case
 576          * (modify original input in SCCB)
 577          */
 578         if (sclp_ioctls.tolower)
 579                 EBC_TOLOWER(start, count);
 580
 581         /*
 582          * if set in ioctl find out characters in lower or upper case
 583          * (depends on current case) separated by a special character,
 584          * works on EBCDIC
 585          */
 586         if (sclp_ioctls.delim)
 587                 count = sclp_switch_cases(start, count,
 588                                           sclp_ioctls.delim,
 589                                           sclp_ioctls.tolower);
 590
 591         /* convert EBCDIC to ASCII (modify original input in SCCB) */
 592         sclp_ebcasc_str(start, count);
 593
 594         /* if set in ioctl write operators input to console  */
 595         if (sclp_ioctls.echo)
 596                 sclp_tty_write(sclp_tty, start, count);
 597
 598         /* transfer input to high level driver */
 599         sclp_tty_input(start, count);
 600 }
 601
 602 static inline struct gds_vector *
 603 find_gds_vector(struct gds_vector *start, struct gds_vector *end, u16 id)
 604 {
 605         struct gds_vector *vec;
 606
 607         for (vec = start; vec < end; vec = (void *) vec + vec->length)
 608                 if (vec->gds_id == id)
 609                         return vec;
 610         return NULL;
 611 }
 612
 613 static inline struct gds_subvector *
 614 find_gds_subvector(struct gds_subvector *start,
 615                    struct gds_subvector *end, u8 key)
 616 {
 617         struct gds_subvector *subvec;
 618
 619         for (subvec = start; subvec < end;
 620              subvec = (void *) subvec + subvec->length)
 621                 if (subvec->key == key)
 622                         return subvec;
 623         return NULL;
 624 }
 625
 626 static inline void
 627 sclp_eval_selfdeftextmsg(struct gds_subvector *start,
 628                          struct gds_subvector *end)
 629 {
 630         struct gds_subvector *subvec;
 631
 632         subvec = start;
 633         while (subvec < end) {
 634                 subvec = find_gds_subvector(subvec, end, 0x30);
 635                 if (!subvec)
 636                         break;
 637                 sclp_get_input((unsigned char *)(subvec + 1),
 638                                (unsigned char *) subvec + subvec->length);
 639                 subvec = (void *) subvec + subvec->length;
 640         }
 641 }
 642
 643 static inline void
 644 sclp_eval_textcmd(struct gds_subvector *start,
 645                   struct gds_subvector *end)
 646 {
 647         struct gds_subvector *subvec;
 648
 649         subvec = start;
 650         while (subvec < end) {
 651                 subvec = find_gds_subvector(subvec, end,
 652                                             GDS_KEY_SelfDefTextMsg);
 653                 if (!subvec)
 654                         break;
 655                 sclp_eval_selfdeftextmsg((struct gds_subvector *)(subvec + 1),
 656                                          (void *)subvec + subvec->length);
 657                 subvec = (void *) subvec + subvec->length;
 658         }
 659 }
 660
 661 static inline void
 662 sclp_eval_cpmsu(struct gds_vector *start, struct gds_vector *end)
 663 {
 664         struct gds_vector *vec;
 665
 666         vec = start;
 667         while (vec < end) {
 668                 vec = find_gds_vector(vec, end, GDS_ID_TextCmd);
 669                 if (!vec)
 670                         break;
 671                 sclp_eval_textcmd((struct gds_subvector *)(vec + 1),
 672                                   (void *) vec + vec->length);
 673                 vec = (void *) vec + vec->length;
 674         }
 675 }
 676
 677
 678 static inline void
 679 sclp_eval_mdsmu(struct gds_vector *start, void *end)
 680 {
 681         struct gds_vector *vec;
 682
 683         vec = find_gds_vector(start, end, GDS_ID_CPMSU);
 684         if (vec)
 685                 sclp_eval_cpmsu(vec + 1, (void *) vec + vec->length);
 686 }
 687
 688 static void
 689 sclp_tty_receiver(struct evbuf_header *evbuf)
 690 {
 691         struct gds_vector *start, *end, *vec;
 692
 693         start = (struct gds_vector *)(evbuf + 1);
 694         end = (void *) evbuf + evbuf->length;
 695         vec = find_gds_vector(start, end, GDS_ID_MDSMU);
 696         if (vec)
 697                 sclp_eval_mdsmu(vec + 1, (void *) vec + vec->length);
 698 }
 699
 700 static void
 701 sclp_tty_state_change(struct sclp_register *reg)
 702 {
 703 }
 704
 705 static struct sclp_register sclp_input_event =
 706 {
 707         .receive_mask = EvTyp_OpCmd_Mask | EvTyp_PMsgCmd_Mask,
 708         .state_change_fn = sclp_tty_state_change,
 709         .receiver_fn = sclp_tty_receiver
 710 };
 711
 712 static const struct tty_operations sclp_ops = {
 713         .open = sclp_tty_open,
 714         .close = sclp_tty_close,
 715         .write = sclp_tty_write,
 716         .put_char = sclp_tty_put_char,
 717         .flush_chars = sclp_tty_flush_chars,
 718         .write_room = sclp_tty_write_room,
 719         .chars_in_buffer = sclp_tty_chars_in_buffer,
 720         .flush_buffer = sclp_tty_flush_buffer,
 721         .ioctl = sclp_tty_ioctl,
 722 };
 723
 724 int __init
 725 sclp_tty_init(void)
 726 {
 727         struct tty_driver *driver;
 728         void *page;
 729         int i;
 730         int rc;
 731
 732         if (!CONSOLE_IS_SCLP)
 733                 return 0;
 734         driver = alloc_tty_driver(1);
 735         if (!driver)
 736                 return -ENOMEM;
 737
 738         rc = sclp_rw_init();
 739         if (rc) {
 740                 printk(KERN_ERR SCLP_TTY_PRINT_HEADER
 741                        "could not register tty - "
 742                        "sclp_rw_init returned %d\n", rc);
 743                 put_tty_driver(driver);
 744                 return rc;
 745         }
 746         /* Allocate pages for output buffering */
 747         INIT_LIST_HEAD(&sclp_tty_pages);
 748         for (i = 0; i < MAX_KMEM_PAGES; i++) {
 749                 page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 750                 if (page == NULL) {
 751                         put_tty_driver(driver);
 752                         return -ENOMEM;
 753                 }
 754                 list_add_tail((struct list_head *) page, &sclp_tty_pages);
 755         }
 756         INIT_LIST_HEAD(&sclp_tty_outqueue);
 757         spin_lock_init(&sclp_tty_lock);
 758         init_waitqueue_head(&sclp_tty_waitq);
 759         init_timer(&sclp_tty_timer);
 760         sclp_ttybuf = NULL;
 761         sclp_tty_buffer_count = 0;
 762         if (MACHINE_IS_VM) {
 763                 /*
 764                  * save 4 characters for the CPU number
 765                  * written at start of each line by VM/CP
 766                  */
 767                 sclp_ioctls_init.columns = 76;
 768                 /* case input lines to lowercase */
 769                 sclp_ioctls_init.tolower = 1;
 770         }
 771         sclp_ioctls = sclp_ioctls_init;
 772         sclp_tty_chars_count = 0;
 773         sclp_tty = NULL;
 774
 775         rc = sclp_register(&sclp_input_event);
 776         if (rc) {
 777                 put_tty_driver(driver);
 778                 return rc;
 779         }
 780
 781         driver->owner = THIS_MODULE;
 782         driver->driver_name = "sclp_line";
 783         driver->name = "sclp_line";
 784         driver->major = TTY_MAJOR;
 785         driver->minor_start = 64;
 786         driver->type = TTY_DRIVER_TYPE_SYSTEM;
 787         driver->subtype = SYSTEM_TYPE_TTY;
 788         driver->init_termios = tty_std_termios;
 789         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
 790         driver->init_termios.c_oflag = ONLCR | XTABS;
 791         driver->init_termios.c_lflag = ISIG | ECHO;
 792         driver->flags = TTY_DRIVER_REAL_RAW;
 793         tty_set_operations(driver, &sclp_ops);
 794         rc = tty_register_driver(driver);
 795         if (rc) {
 796                 printk(KERN_ERR SCLP_TTY_PRINT_HEADER
 797                        "could not register tty - "
 798                        "tty_register_driver returned %d\n", rc);
 799                 put_tty_driver(driver);
 800                 return rc;
 801         }
 802         sclp_tty_driver = driver;
 803         return 0;
 804 }
 805 module_init(sclp_tty_init);