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