git.oblomov.eu Git - linux-2.6/blob - drivers/s390/char/sclp_tty.c

   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/config.h>
  12 #include <linux/module.h>
  13 #include <linux/kmod.h>
  14 #include <linux/tty.h>
  15 #include <linux/tty_driver.h>
  16 #include <linux/tty_flip.h>
  17 #include <linux/sched.h>
  18 #include <linux/wait.h>
  19 #include <linux/slab.h>
  20 #include <linux/err.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <asm/uaccess.h>
  24
  25 #include "ctrlchar.h"
  26 #include "sclp.h"
  27 #include "sclp_rw.h"
  28 #include "sclp_tty.h"
  29
  30 #define SCLP_TTY_PRINT_HEADER "sclp tty driver: "
  31
  32 /*
  33  * size of a buffer that collects single characters coming in
  34  * via sclp_tty_put_char()
  35  */
  36 #define SCLP_TTY_BUF_SIZE 512
  37
  38 /*
  39  * There is exactly one SCLP terminal, so we can keep things simple
  40  * and allocate all variables statically.
  41  */
  42
  43 /* Lock to guard over changes to global variables. */
  44 static spinlock_t sclp_tty_lock;
  45 /* List of free pages that can be used for console output buffering. */
  46 static struct list_head sclp_tty_pages;
  47 /* List of full struct sclp_buffer structures ready for output. */
  48 static struct list_head sclp_tty_outqueue;
  49 /* Counter how many buffers are emitted. */
  50 static int sclp_tty_buffer_count;
  51 /* Pointer to current console buffer. */
  52 static struct sclp_buffer *sclp_ttybuf;
  53 /* Timer for delayed output of console messages. */
  54 static struct timer_list sclp_tty_timer;
  55 /* Waitqueue to wait for buffers to get empty. */
  56 static wait_queue_head_t sclp_tty_waitq;
  57
  58 static struct tty_struct *sclp_tty;
  59 static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
  60 static unsigned short int sclp_tty_chars_count;
  61
  62 struct tty_driver *sclp_tty_driver;
  63
  64 extern struct termios  tty_std_termios;
  65
  66 static struct sclp_ioctls sclp_ioctls;
  67 static struct sclp_ioctls sclp_ioctls_init =
  68 {
  69         8,                      /* 1 hor. tab. = 8 spaces */
  70         0,                      /* no echo of input by this driver */
  71         80,                     /* 80 characters/line */
  72         1,                      /* write after 1/10 s without final new line */
  73         MAX_KMEM_PAGES,         /* quick fix: avoid __alloc_pages */
  74         MAX_KMEM_PAGES,         /* take 32/64 pages from kernel memory, */
  75         0,                      /* do not convert to lower case */
  76         0x6c                    /* to seprate upper and lower case */
  77                                 /* ('%' in EBCDIC) */
  78 };
  79
  80 /* This routine is called whenever we try to open a SCLP terminal. */
  81 static int
  82 sclp_tty_open(struct tty_struct *tty, struct file *filp)
  83 {
  84         sclp_tty = tty;
  85         tty->driver_data = NULL;
  86         tty->low_latency = 0;
  87         return 0;
  88 }
  89
  90 /* This routine is called when the SCLP terminal is closed. */
  91 static void
  92 sclp_tty_close(struct tty_struct *tty, struct file *filp)
  93 {
  94         if (tty->count > 1)
  95                 return;
  96         sclp_tty = NULL;
  97 }
  98
  99 /* execute commands to control the i/o behaviour of the SCLP tty at runtime */
 100 static int
 101 sclp_tty_ioctl(struct tty_struct *tty, struct file * file,
 102                unsigned int cmd, unsigned long arg)
 103 {
 104         unsigned long flags;
 105         unsigned int obuf;
 106         int check;
 107         int rc;
 108
 109         if (tty->flags & (1 << TTY_IO_ERROR))
 110                 return -EIO;
 111         rc = 0;
 112         check = 0;
 113         switch (cmd) {
 114         case TIOCSCLPSHTAB:
 115                 /* set width of horizontal tab  */
 116                 if (get_user(sclp_ioctls.htab, (unsigned short __user *) arg))
 117                         rc = -EFAULT;
 118                 else
 119                         check = 1;
 120                 break;
 121         case TIOCSCLPGHTAB:
 122                 /* get width of horizontal tab  */
 123                 if (put_user(sclp_ioctls.htab, (unsigned short __user *) arg))
 124                         rc = -EFAULT;
 125                 break;
 126         case TIOCSCLPSECHO:
 127                 /* enable/disable echo of input */
 128                 if (get_user(sclp_ioctls.echo, (unsigned char __user *) arg))
 129                         rc = -EFAULT;
 130                 break;
 131         case TIOCSCLPGECHO:
 132                 /* Is echo of input enabled ?  */
 133                 if (put_user(sclp_ioctls.echo, (unsigned char __user *) arg))
 134                         rc = -EFAULT;
 135                 break;
 136         case TIOCSCLPSCOLS:
 137                 /* set number of columns for output  */
 138                 if (get_user(sclp_ioctls.columns, (unsigned short __user *) arg))
 139                         rc = -EFAULT;
 140                 else
 141                         check = 1;
 142                 break;
 143         case TIOCSCLPGCOLS:
 144                 /* get number of columns for output  */
 145                 if (put_user(sclp_ioctls.columns, (unsigned short __user *) arg))
 146                         rc = -EFAULT;
 147                 break;
 148         case TIOCSCLPSNL:
 149                 /* enable/disable writing without final new line character  */
 150                 if (get_user(sclp_ioctls.final_nl, (signed char __user *) arg))
 151                         rc = -EFAULT;
 152                 break;
 153         case TIOCSCLPGNL:
 154                 /* Is writing without final new line character enabled ?  */
 155                 if (put_user(sclp_ioctls.final_nl, (signed char __user *) arg))
 156                         rc = -EFAULT;
 157                 break;
 158         case TIOCSCLPSOBUF:
 159                 /*
 160                  * set the maximum buffers size for output, will be rounded
 161                  * up to next 4kB boundary and stored as number of SCCBs
 162                  * (4kB Buffers) limitation: 256 x 4kB
 163                  */
 164                 if (get_user(obuf, (unsigned int __user *) arg) == 0) {
 165                         if (obuf & 0xFFF)
 166                                 sclp_ioctls.max_sccb = (obuf >> 12) + 1;
 167                         else
 168                                 sclp_ioctls.max_sccb = (obuf >> 12);
 169                 } else
 170                         rc = -EFAULT;
 171                 break;
 172         case TIOCSCLPGOBUF:
 173                 /* get the maximum buffers size for output  */
 174                 obuf = sclp_ioctls.max_sccb << 12;
 175                 if (put_user(obuf, (unsigned int __user *) arg))
 176                         rc = -EFAULT;
 177                 break;
 178         case TIOCSCLPGKBUF:
 179                 /* get the number of buffers got from kernel at startup */
 180                 if (put_user(sclp_ioctls.kmem_sccb, (unsigned short __user *) arg))
 181                         rc = -EFAULT;
 182                 break;
 183         case TIOCSCLPSCASE:
 184                 /* enable/disable conversion from upper to lower case */
 185                 if (get_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
 186                         rc = -EFAULT;
 187                 break;
 188         case TIOCSCLPGCASE:
 189                 /* Is conversion from upper to lower case of input enabled? */
 190                 if (put_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
 191                         rc = -EFAULT;
 192                 break;
 193         case TIOCSCLPSDELIM:
 194                 /*
 195                  * set special character used for separating upper and
 196                  * lower case, 0x00 disables this feature
 197                  */
 198                 if (get_user(sclp_ioctls.delim, (unsigned char __user *) arg))
 199                         rc = -EFAULT;
 200                 break;
 201         case TIOCSCLPGDELIM:
 202                 /*
 203                  * get special character used for separating upper and
 204                  * lower case, 0x00 disables this feature
 205                  */
 206                 if (put_user(sclp_ioctls.delim, (unsigned char __user *) arg))
 207                         rc = -EFAULT;
 208                 break;
 209         case TIOCSCLPSINIT:
 210                 /* set initial (default) sclp ioctls  */
 211                 sclp_ioctls = sclp_ioctls_init;
 212                 check = 1;
 213                 break;
 214         default:
 215                 rc = -ENOIOCTLCMD;
 216                 break;
 217         }
 218         if (check) {
 219                 spin_lock_irqsave(&sclp_tty_lock, flags);
 220                 if (sclp_ttybuf != NULL) {
 221                         sclp_set_htab(sclp_ttybuf, sclp_ioctls.htab);
 222                         sclp_set_columns(sclp_ttybuf, sclp_ioctls.columns);
 223                 }
 224                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
 225         }
 226         return rc;
 227 }
 228
 229 /*
 230  * This routine returns the numbers of characters the tty driver
 231  * will accept for queuing to be written.  This number is subject
 232  * to change as output buffers get emptied, or if the output flow
 233  * control is acted. This is not an exact number because not every
 234  * character needs the same space in the sccb. The worst case is
 235  * a string of newlines. Every newlines creates a new mto which
 236  * needs 8 bytes.
 237  */
 238 static int
 239 sclp_tty_write_room (struct tty_struct *tty)
 240 {
 241         unsigned long flags;
 242         struct list_head *l;
 243         int count;
 244
 245         spin_lock_irqsave(&sclp_tty_lock, flags);
 246         count = 0;
 247         if (sclp_ttybuf != NULL)
 248                 count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct mto);
 249         list_for_each(l, &sclp_tty_pages)
 250                 count += NR_EMPTY_MTO_PER_SCCB;
 251         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 252         return count;
 253 }
 254
 255 static void
 256 sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
 257 {
 258         unsigned long flags;
 259         void *page;
 260
 261         do {
 262                 page = sclp_unmake_buffer(buffer);
 263                 spin_lock_irqsave(&sclp_tty_lock, flags);
 264                 /* Remove buffer from outqueue */
 265                 list_del(&buffer->list);
 266                 sclp_tty_buffer_count--;
 267                 list_add_tail((struct list_head *) page, &sclp_tty_pages);
 268                 /* Check if there is a pending buffer on the out queue. */
 269                 buffer = NULL;
 270                 if (!list_empty(&sclp_tty_outqueue))
 271                         buffer = list_entry(sclp_tty_outqueue.next,
 272                                             struct sclp_buffer, list);
 273                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
 274         } while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback));
 275         wake_up(&sclp_tty_waitq);
 276         /* check if the tty needs a wake up call */
 277         if (sclp_tty != NULL) {
 278                 tty_wakeup(sclp_tty);
 279         }
 280 }
 281
 282 static inline void
 283 __sclp_ttybuf_emit(struct sclp_buffer *buffer)
 284 {
 285         unsigned long flags;
 286         int count;
 287         int rc;
 288
 289         spin_lock_irqsave(&sclp_tty_lock, flags);
 290         list_add_tail(&buffer->list, &sclp_tty_outqueue);
 291         count = sclp_tty_buffer_count++;
 292         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 293         if (count)
 294                 return;
 295         rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback);
 296         if (rc)
 297                 sclp_ttybuf_callback(buffer, rc);
 298 }
 299
 300 /*
 301  * When this routine is called from the timer then we flush the
 302  * temporary write buffer.
 303  */
 304 static void
 305 sclp_tty_timeout(unsigned long data)
 306 {
 307         unsigned long flags;
 308         struct sclp_buffer *buf;
 309
 310         spin_lock_irqsave(&sclp_tty_lock, flags);
 311         buf = sclp_ttybuf;
 312         sclp_ttybuf = NULL;
 313         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 314
 315         if (buf != NULL) {
 316                 __sclp_ttybuf_emit(buf);
 317         }
 318 }
 319
 320 /*
 321  * Write a string to the sclp tty.
 322  */
 323 static void
 324 sclp_tty_write_string(const unsigned char *str, int count)
 325 {
 326         unsigned long flags;
 327         void *page;
 328         int written;
 329         struct sclp_buffer *buf;
 330
 331         if (count <= 0)
 332                 return;
 333         spin_lock_irqsave(&sclp_tty_lock, flags);
 334         do {
 335                 /* Create a sclp output buffer if none exists yet */
 336                 if (sclp_ttybuf == NULL) {
 337                         while (list_empty(&sclp_tty_pages)) {
 338                                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
 339                                 if (in_interrupt())
 340                                         sclp_sync_wait();
 341                                 else
 342                                         wait_event(sclp_tty_waitq,
 343                                                 !list_empty(&sclp_tty_pages));
 344                                 spin_lock_irqsave(&sclp_tty_lock, flags);
 345                         }
 346                         page = sclp_tty_pages.next;
 347                         list_del((struct list_head *) page);
 348                         sclp_ttybuf = sclp_make_buffer(page,
 349                                                        sclp_ioctls.columns,
 350                                                        sclp_ioctls.htab);
 351                 }
 352                 /* try to write the string to the current output buffer */
 353                 written = sclp_write(sclp_ttybuf, str, count);
 354                 if (written == count)
 355                         break;
 356                 /*
 357                  * Not all characters could be written to the current
 358                  * output buffer. Emit the buffer, create a new buffer
 359                  * and then output the rest of the string.
 360                  */
 361                 buf = sclp_ttybuf;
 362                 sclp_ttybuf = NULL;
 363                 spin_unlock_irqrestore(&sclp_tty_lock, flags);
 364                 __sclp_ttybuf_emit(buf);
 365                 spin_lock_irqsave(&sclp_tty_lock, flags);
 366                 str += written;
 367                 count -= written;
 368         } while (count > 0);
 369         /* Setup timer to output current console buffer after 1/10 second */
 370         if (sclp_ioctls.final_nl) {
 371                 if (sclp_ttybuf != NULL &&
 372                     sclp_chars_in_buffer(sclp_ttybuf) != 0 &&
 373                     !timer_pending(&sclp_tty_timer)) {
 374                         init_timer(&sclp_tty_timer);
 375                         sclp_tty_timer.function = sclp_tty_timeout;
 376                         sclp_tty_timer.data = 0UL;
 377                         sclp_tty_timer.expires = jiffies + HZ/10;
 378                         add_timer(&sclp_tty_timer);
 379                 }
 380         } else {
 381                 if (sclp_ttybuf != NULL &&
 382                     sclp_chars_in_buffer(sclp_ttybuf) != 0) {
 383                         buf = sclp_ttybuf;
 384                         sclp_ttybuf = NULL;
 385                         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 386                         __sclp_ttybuf_emit(buf);
 387                         spin_lock_irqsave(&sclp_tty_lock, flags);
 388                 }
 389         }
 390         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 391 }
 392
 393 /*
 394  * This routine is called by the kernel to write a series of characters to the
 395  * tty device. The characters may come from user space or kernel space. This
 396  * routine will return the number of characters actually accepted for writing.
 397  */
 398 static int
 399 sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
 400 {
 401         if (sclp_tty_chars_count > 0) {
 402                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
 403                 sclp_tty_chars_count = 0;
 404         }
 405         sclp_tty_write_string(buf, count);
 406         return count;
 407 }
 408
 409 /*
 410  * This routine is called by the kernel to write a single character to the tty
 411  * device. If the kernel uses this routine, it must call the flush_chars()
 412  * routine (if defined) when it is done stuffing characters into the driver.
 413  *
 414  * Characters provided to sclp_tty_put_char() are buffered by the SCLP driver.
 415  * If the given character is a '\n' the contents of the SCLP write buffer
 416  * - including previous characters from sclp_tty_put_char() and strings from
 417  * sclp_write() without final '\n' - will be written.
 418  */
 419 static void
 420 sclp_tty_put_char(struct tty_struct *tty, unsigned char ch)
 421 {
 422         sclp_tty_chars[sclp_tty_chars_count++] = ch;
 423         if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) {
 424                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
 425                 sclp_tty_chars_count = 0;
 426         }
 427 }
 428
 429 /*
 430  * This routine is called by the kernel after it has written a series of
 431  * characters to the tty device using put_char().
 432  */
 433 static void
 434 sclp_tty_flush_chars(struct tty_struct *tty)
 435 {
 436         if (sclp_tty_chars_count > 0) {
 437                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
 438                 sclp_tty_chars_count = 0;
 439         }
 440 }
 441
 442 /*
 443  * This routine returns the number of characters in the write buffer of the
 444  * SCLP driver. The provided number includes all characters that are stored
 445  * in the SCCB (will be written next time the SCLP is not busy) as well as
 446  * characters in the write buffer (will not be written as long as there is a
 447  * final line feed missing).
 448  */
 449 static int
 450 sclp_tty_chars_in_buffer(struct tty_struct *tty)
 451 {
 452         unsigned long flags;
 453         struct list_head *l;
 454         struct sclp_buffer *t;
 455         int count;
 456
 457         spin_lock_irqsave(&sclp_tty_lock, flags);
 458         count = 0;
 459         if (sclp_ttybuf != NULL)
 460                 count = sclp_chars_in_buffer(sclp_ttybuf);
 461         list_for_each(l, &sclp_tty_outqueue) {
 462                 t = list_entry(l, struct sclp_buffer, list);
 463                 count += sclp_chars_in_buffer(t);
 464         }
 465         spin_unlock_irqrestore(&sclp_tty_lock, flags);
 466         return count;
 467 }
 468
 469 /*
 470  * removes all content from buffers of low level driver
 471  */
 472 static void
 473 sclp_tty_flush_buffer(struct tty_struct *tty)
 474 {
 475         if (sclp_tty_chars_count > 0) {
 476                 sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
 477                 sclp_tty_chars_count = 0;
 478         }
 479 }
 480
 481 /*
 482  * push input to tty
 483  */
 484 static void
 485 sclp_tty_input(unsigned char* buf, unsigned int count)
 486 {
 487         unsigned int cchar;
 488
 489         /*
 490          * If this tty driver is currently closed
 491          * then throw the received input away.
 492          */
 493         if (sclp_tty == NULL)
 494                 return;
 495         cchar = ctrlchar_handle(buf, count, sclp_tty);
 496         switch (cchar & CTRLCHAR_MASK) {
 497         case CTRLCHAR_SYSRQ:
 498                 break;
 499         case CTRLCHAR_CTRL:
 500                 tty_insert_flip_char(sclp_tty, cchar, TTY_NORMAL);
 501                 tty_flip_buffer_push(sclp_tty);
 502                 break;
 503         case CTRLCHAR_NONE:
 504                 /* send (normal) input to line discipline */
 505                 if (count < 2 ||
 506                     (strncmp((const char *) buf + count - 2, "^n", 2) &&
 507                      strncmp((const char *) buf + count - 2, "\252n", 2))) {
 508                         /* add the auto \n */
 509                         tty_insert_flip_string(sclp_tty, buf, count);
 510                         tty_insert_flip_char(sclp_tty, '\n', TTY_NORMAL);
 511                 } else
 512                         tty_insert_flip_string(sclp_tty, buf, count - 2);
 513                 tty_flip_buffer_push(sclp_tty);
 514                 break;
 515         }
 516 }
 517
 518 /*
 519  * get a EBCDIC string in upper/lower case,
 520  * find out characters in lower/upper case separated by a special character,
 521  * modifiy original string,
 522  * returns length of resulting string
 523  */
 524 static int
 525 sclp_switch_cases(unsigned char *buf, int count,
 526                   unsigned char delim, int tolower)
 527 {
 528         unsigned char *ip, *op;
 529         int toggle;
 530
 531         /* initially changing case is off */
 532         toggle = 0;
 533         ip = op = buf;
 534         while (count-- > 0) {
 535                 /* compare with special character */
 536                 if (*ip == delim) {
 537                         /* followed by another special character? */
 538                         if (count && ip[1] == delim) {
 539                                 /*
 540                                  * ... then put a single copy of the special
 541                                  * character to the output string
 542                                  */
 543                                 *op++ = *ip++;
 544                                 count--;
 545                         } else
 546                                 /*
 547                                  * ... special character follower by a normal
 548                                  * character toggles the case change behaviour
 549                                  */
 550                                 toggle = ~toggle;
 551                         /* skip special character */
 552                         ip++;
 553                 } else
 554                         /* not the special character */
 555                         if (toggle)
 556                                 /* but case switching is on */
 557                                 if (tolower)
 558                                         /* switch to uppercase */
 559                                         *op++ = _ebc_toupper[(int) *ip++];
 560                                 else
 561                                         /* switch to lowercase */
 562                                         *op++ = _ebc_tolower[(int) *ip++];
 563                         else
 564                                 /* no case switching, copy the character */
 565                                 *op++ = *ip++;
 566         }
 567         /* return length of reformatted string. */
 568         return op - buf;
 569 }
 570
 571 static void
 572 sclp_get_input(unsigned char *start, unsigned char *end)
 573 {
 574         int count;
 575
 576         count = end - start;
 577         /*
 578          * if set in ioctl convert EBCDIC to lower case
 579          * (modify original input in SCCB)
 580          */
 581         if (sclp_ioctls.tolower)
 582                 EBC_TOLOWER(start, count);
 583
 584         /*
 585          * if set in ioctl find out characters in lower or upper case
 586          * (depends on current case) separated by a special character,
 587          * works on EBCDIC
 588          */
 589         if (sclp_ioctls.delim)
 590                 count = sclp_switch_cases(start, count,
 591                                           sclp_ioctls.delim,
 592                                           sclp_ioctls.tolower);
 593
 594         /* convert EBCDIC to ASCII (modify original input in SCCB) */
 595         sclp_ebcasc_str(start, count);
 596
 597         /* if set in ioctl write operators input to console  */
 598         if (sclp_ioctls.echo)
 599                 sclp_tty_write(sclp_tty, start, count);
 600
 601         /* transfer input to high level driver */
 602         sclp_tty_input(start, count);
 603 }
 604
 605 static inline struct gds_vector *
 606 find_gds_vector(struct gds_vector *start, struct gds_vector *end, u16 id)
 607 {
 608         struct gds_vector *vec;
 609
 610         for (vec = start; vec < end; vec = (void *) vec + vec->length)
 611                 if (vec->gds_id == id)
 612                         return vec;
 613         return NULL;
 614 }
 615
 616 static inline struct gds_subvector *
 617 find_gds_subvector(struct gds_subvector *start,
 618                    struct gds_subvector *end, u8 key)
 619 {
 620         struct gds_subvector *subvec;
 621
 622         for (subvec = start; subvec < end;
 623              subvec = (void *) subvec + subvec->length)
 624                 if (subvec->key == key)
 625                         return subvec;
 626         return NULL;
 627 }
 628
 629 static inline void
 630 sclp_eval_selfdeftextmsg(struct gds_subvector *start,
 631                          struct gds_subvector *end)
 632 {
 633         struct gds_subvector *subvec;
 634
 635         subvec = start;
 636         while (subvec < end) {
 637                 subvec = find_gds_subvector(subvec, end, 0x30);
 638                 if (!subvec)
 639                         break;
 640                 sclp_get_input((unsigned char *)(subvec + 1),
 641                                (unsigned char *) subvec + subvec->length);
 642                 subvec = (void *) subvec + subvec->length;
 643         }
 644 }
 645
 646 static inline void
 647 sclp_eval_textcmd(struct gds_subvector *start,
 648                   struct gds_subvector *end)
 649 {
 650         struct gds_subvector *subvec;
 651
 652         subvec = start;
 653         while (subvec < end) {
 654                 subvec = find_gds_subvector(subvec, end,
 655                                             GDS_KEY_SelfDefTextMsg);
 656                 if (!subvec)
 657                         break;
 658                 sclp_eval_selfdeftextmsg((struct gds_subvector *)(subvec + 1),
 659                                          (void *)subvec + subvec->length);
 660                 subvec = (void *) subvec + subvec->length;
 661         }
 662 }
 663
 664 static inline void
 665 sclp_eval_cpmsu(struct gds_vector *start, struct gds_vector *end)
 666 {
 667         struct gds_vector *vec;
 668
 669         vec = start;
 670         while (vec < end) {
 671                 vec = find_gds_vector(vec, end, GDS_ID_TextCmd);
 672                 if (!vec)
 673                         break;
 674                 sclp_eval_textcmd((struct gds_subvector *)(vec + 1),
 675                                   (void *) vec + vec->length);
 676                 vec = (void *) vec + vec->length;
 677         }
 678 }
 679
 680
 681 static inline void
 682 sclp_eval_mdsmu(struct gds_vector *start, void *end)
 683 {
 684         struct gds_vector *vec;
 685
 686         vec = find_gds_vector(start, end, GDS_ID_CPMSU);
 687         if (vec)
 688                 sclp_eval_cpmsu(vec + 1, (void *) vec + vec->length);
 689 }
 690
 691 static void
 692 sclp_tty_receiver(struct evbuf_header *evbuf)
 693 {
 694         struct gds_vector *start, *end, *vec;
 695
 696         start = (struct gds_vector *)(evbuf + 1);
 697         end = (void *) evbuf + evbuf->length;
 698         vec = find_gds_vector(start, end, GDS_ID_MDSMU);
 699         if (vec)
 700                 sclp_eval_mdsmu(vec + 1, (void *) vec + vec->length);
 701 }
 702
 703 static void
 704 sclp_tty_state_change(struct sclp_register *reg)
 705 {
 706 }
 707
 708 static struct sclp_register sclp_input_event =
 709 {
 710         .receive_mask = EvTyp_OpCmd_Mask | EvTyp_PMsgCmd_Mask,
 711         .state_change_fn = sclp_tty_state_change,
 712         .receiver_fn = sclp_tty_receiver
 713 };
 714
 715 static struct tty_operations sclp_ops = {
 716         .open = sclp_tty_open,
 717         .close = sclp_tty_close,
 718         .write = sclp_tty_write,
 719         .put_char = sclp_tty_put_char,
 720         .flush_chars = sclp_tty_flush_chars,
 721         .write_room = sclp_tty_write_room,
 722         .chars_in_buffer = sclp_tty_chars_in_buffer,
 723         .flush_buffer = sclp_tty_flush_buffer,
 724         .ioctl = sclp_tty_ioctl,
 725 };
 726
 727 int __init
 728 sclp_tty_init(void)
 729 {
 730         struct tty_driver *driver;
 731         void *page;
 732         int i;
 733         int rc;
 734
 735         if (!CONSOLE_IS_SCLP)
 736                 return 0;
 737         driver = alloc_tty_driver(1);
 738         if (!driver)
 739                 return -ENOMEM;
 740
 741         rc = sclp_rw_init();
 742         if (rc) {
 743                 printk(KERN_ERR SCLP_TTY_PRINT_HEADER
 744                        "could not register tty - "
 745                        "sclp_rw_init returned %d\n", rc);
 746                 put_tty_driver(driver);
 747                 return rc;
 748         }
 749         /* Allocate pages for output buffering */
 750         INIT_LIST_HEAD(&sclp_tty_pages);
 751         for (i = 0; i < MAX_KMEM_PAGES; i++) {
 752                 page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 753                 if (page == NULL) {
 754                         put_tty_driver(driver);
 755                         return -ENOMEM;
 756                 }
 757                 list_add_tail((struct list_head *) page, &sclp_tty_pages);
 758         }
 759         INIT_LIST_HEAD(&sclp_tty_outqueue);
 760         spin_lock_init(&sclp_tty_lock);
 761         init_waitqueue_head(&sclp_tty_waitq);
 762         init_timer(&sclp_tty_timer);
 763         sclp_ttybuf = NULL;
 764         sclp_tty_buffer_count = 0;
 765         if (MACHINE_IS_VM) {
 766                 /*
 767                  * save 4 characters for the CPU number
 768                  * written at start of each line by VM/CP
 769                  */
 770                 sclp_ioctls_init.columns = 76;
 771                 /* case input lines to lowercase */
 772                 sclp_ioctls_init.tolower = 1;
 773         }
 774         sclp_ioctls = sclp_ioctls_init;
 775         sclp_tty_chars_count = 0;
 776         sclp_tty = NULL;
 777
 778         rc = sclp_register(&sclp_input_event);
 779         if (rc) {
 780                 put_tty_driver(driver);
 781                 return rc;
 782         }
 783
 784         driver->owner = THIS_MODULE;
 785         driver->driver_name = "sclp_line";
 786         driver->name = "sclp_line";
 787         driver->major = TTY_MAJOR;
 788         driver->minor_start = 64;
 789         driver->type = TTY_DRIVER_TYPE_SYSTEM;
 790         driver->subtype = SYSTEM_TYPE_TTY;
 791         driver->init_termios = tty_std_termios;
 792         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
 793         driver->init_termios.c_oflag = ONLCR | XTABS;
 794         driver->init_termios.c_lflag = ISIG | ECHO;
 795         driver->flags = TTY_DRIVER_REAL_RAW;
 796         tty_set_operations(driver, &sclp_ops);
 797         rc = tty_register_driver(driver);
 798         if (rc) {
 799                 printk(KERN_ERR SCLP_TTY_PRINT_HEADER
 800                        "could not register tty - "
 801                        "tty_register_driver returned %d\n", rc);
 802                 put_tty_driver(driver);
 803                 return rc;
 804         }
 805         sclp_tty_driver = driver;
 806         return 0;
 807 }
 808 module_init(sclp_tty_init);