bsd/dev/i386/km.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*      Copyright (c) 1992 NeXT Computer, Inc.  All rights reserved.
  26  *
  27  * km.m - kernel keyboard/monitor module, procedural interface.
  28  *
  29  * HISTORY
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/tty.h>
  34
  35 #include <dev/i386/cons.h>
  36 #include <sys/conf.h>
  37 #include <sys/systm.h>
  38 #include <sys/uio.h>
  39 #include <sys/fcntl.h>          /* for kmopen */
  40 #include <sys/errno.h>
  41 #include <sys/proc.h>           /* for kmopen */
  42 #include <sys/msgbuf.h>
  43 #include <sys/time.h>
  44 #include <dev/kmreg_com.h>
  45 #include <pexpert/pexpert.h>
  46
  47 /*
  48  * 'Global' variables, shared only by this file and conf.c.
  49  */
  50 extern struct tty       cons;
  51 struct tty *km_tty[1] = { &cons };
  52
  53 /*
  54  * this works early on, after initialize_screen() but before autoconf (and thus
  55  * before we have a kmDevice).
  56  */
  57 int disableConsoleOutput;
  58
  59 /*
  60  * 'Global' variables, shared only by this file and kmDevice.m.
  61  */
  62 int initialized = 0;
  63
  64 static int kmoutput(struct tty *tp);
  65 static void kmstart(struct tty *tp);
  66
  67 extern void KeyboardOpen(void);
  68
  69 int kminit()
  70 {
  71          cons.t_dev = makedev(12, 0);
  72         initialized = 1;
  73 }
  74 /*
  75  * cdevsw interface to km driver.
  76  */
  77 int
  78 kmopen(
  79         dev_t dev,
  80         int flag,
  81         int devtype,
  82         struct proc *pp)
  83 {
  84         int rtn;
  85         int unit;
  86         struct tty *tp;
  87         struct winsize *wp;
  88         int ret;
  89
  90         unit = minor(dev);
  91         if(unit >= 1)
  92                 return (ENXIO);
  93
  94         tp = (struct tty *)&cons;
  95         tp->t_oproc = kmstart;
  96         tp->t_param = NULL;
  97         tp->t_dev = dev;
  98
  99         if ( !(tp->t_state & TS_ISOPEN) ) {
 100                 tp->t_iflag = TTYDEF_IFLAG;
 101                 tp->t_oflag = TTYDEF_OFLAG;
 102                 tp->t_cflag = (CREAD | CS8 | CLOCAL);
 103                 tp->t_lflag = TTYDEF_LFLAG;
 104                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
 105                 termioschars(&tp->t_termios);
 106                 ttsetwater(tp);
 107         } else if ((tp->t_state & TS_XCLUDE) && pp->p_ucred->cr_uid != 0)
 108                 return EBUSY;
 109
 110         tp->t_state |= TS_CARR_ON; /* lie and say carrier exists and is on. */
 111         ret = ((*linesw[tp->t_line].l_open)(dev, tp));
 112         {
 113                 PE_Video video;
 114                 wp = &tp->t_winsize;
 115                 /* Magic numbers.  These are CHARWIDTH and CHARHEIGHT
 116                  * from pexpert/i386/video_console.c
 117                  */
 118                 wp->ws_xpixel = 8;
 119                 wp->ws_ypixel = 16;
 120
 121                 if (flag & O_POPUP)
 122                         PE_initialize_console(0, kPETextScreen);
 123
 124                 bzero(&video, sizeof(video));
 125                 PE_current_console(&video);
 126                 if( video.v_width != 0 && video.v_height != 0 ) {
 127                         wp->ws_col = video.v_width / wp->ws_xpixel;
 128                         wp->ws_row = video.v_height / wp->ws_ypixel;
 129                 } else {
 130                         wp->ws_col = 100;
 131                         wp->ws_row = 36;
 132                 }
 133         }
 134         return ret;
 135 }
 136
 137 int
 138 kmclose(
 139         dev_t dev,
 140         int flag,
 141         int mode,
 142         struct proc *p)
 143 {
 144
 145         struct tty *tp;
 146
 147         tp = &cons;
 148         (*linesw[tp->t_line].l_close)(tp,flag);
 149         ttyclose(tp);
 150         return (0);
 151 }
 152
 153 int
 154 kmread(
 155         dev_t dev,
 156         struct uio *uio,
 157         int ioflag)
 158 {
 159         register struct tty *tp;
 160
 161         tp = &cons;
 162         return ((*linesw[tp->t_line].l_read)(tp, uio, ioflag));
 163 }
 164
 165 int
 166 kmwrite(
 167         dev_t dev,
 168         struct uio *uio,
 169         int ioflag)
 170 {
 171         register struct tty *tp;
 172
 173         tp = &cons;
 174         return ((*linesw[tp->t_line].l_write)(tp, uio, ioflag));
 175 }
 176
 177 int
 178 kmioctl(
 179         dev_t dev,
 180         int cmd,
 181         caddr_t data,
 182         int flag,
 183         struct proc *p)
 184 {
 185         int error;
 186         struct tty *tp = &cons;
 187         struct winsize *wp;
 188
 189         switch (cmd) {
 190
 191
 192
 193             case KMIOCSIZE:
 194                 wp = (struct winsize *)data;
 195                 *wp = tp->t_winsize;
 196                 return 0;
 197
 198             case TIOCSWINSZ:
 199                 /* Prevent changing of console size --
 200                  * this ensures that login doesn't revert to the
 201                  * termcap-defined size
 202                  */
 203                 return EINVAL;
 204
 205             /* Bodge in the CLOCAL flag as the km device is always local */
 206             case TIOCSETA:
 207             case TIOCSETAW:
 208             case TIOCSETAF: {
 209                 register struct termios *t = (struct termios *)data;
 210                 t->c_cflag |= CLOCAL;
 211                 /* No Break */
 212             }
 213             default:
 214                 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
 215                 if (error >= 0) {
 216                         return error;
 217                 }
 218                 error = ttioctl (tp, cmd, data, flag, p);
 219                 if (error >= 0) {
 220                         return error;
 221                 }
 222                 else {
 223                         return ENOTTY;
 224                 }
 225         }
 226 }
 227
 228 int
 229 kmputc(
 230         int c)
 231 {
 232
 233         if( disableConsoleOutput)
 234                 return( 0);
 235
 236         if(!initialized)
 237                 return( 0);
 238
 239         if(c == '\n')
 240                 cnputc('\r');
 241
 242         cnputc(c);
 243
 244         return 0;
 245 }
 246
 247 int
 248 kmgetc(
 249         dev_t dev)
 250 {
 251         int c;
 252
 253         c= cngetc();
 254
 255         if (c == '\r') {
 256                 c = '\n';
 257         }
 258         cnputc(c);
 259         return c;
 260 }
 261
 262 int
 263 kmgetc_silent(
 264         dev_t dev)
 265 {
 266         int c;
 267
 268         c= cngetc();
 269         if (c == '\r') {
 270                 c = '\n';
 271         }
 272         return c;
 273 }
 274
 275 /*
 276  * Callouts from linesw.
 277  */
 278
 279 #define KM_LOWAT_DELAY  ((ns_time_t)1000)
 280
 281 static void
 282 kmstart(
 283         struct tty *tp)
 284 {
 285         extern int hz;
 286         if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP))
 287                 goto out;
 288         if (tp->t_outq.c_cc == 0)
 289                 goto out;
 290         tp->t_state |= TS_BUSY;
 291         if (tp->t_outq.c_cc > tp->t_lowat) {
 292                 /*
 293                  * Start immediately.
 294                  */
 295                 kmoutput(tp);
 296         }
 297         else {
 298                 /*
 299                  * Wait a bit...
 300                  */
 301 #if 0
 302                 /* FIXME */
 303                 timeout(kmtimeout, tp, hz);
 304 #else
 305                 kmoutput(tp);
 306 #endif
 307         }
 308 out:
 309         ttwwakeup(tp);
 310 }
 311
 312 static void
 313 kmtimeout(void *arg)
 314 {
 315         boolean_t       funnel_state;
 316         struct tty      *tp = (struct tty *) arg;
 317
 318         funnel_state = thread_funnel_set(kernel_flock, TRUE);
 319         kmoutput(tp);
 320         (void) thread_funnel_set(kernel_flock, funnel_state);
 321
 322
 323 }
 324 static int
 325 kmoutput(
 326         struct tty *tp)
 327 {
 328         /*
 329          * FIXME - to be grokked...copied from m68k km.c.
 330          */
 331         char            buf[80];
 332         char            *cp;
 333         int             cc = -1;
 334         extern int hz;
 335
 336
 337         while (tp->t_outq.c_cc > 0) {
 338                 cc = ndqb(&tp->t_outq, 0);
 339                 if (cc == 0)
 340                         break;
 341                 cc = min(cc, sizeof buf);
 342                 (void) q_to_b(&tp->t_outq, buf, cc);
 343                 for (cp = buf; cp < &buf[cc]; cp++) {
 344                     kmputc(*cp & 0x7f);
 345                 }
 346         }
 347         if (tp->t_outq.c_cc > 0) {
 348                 timeout(kmtimeout, tp, hz);
 349         }
 350         tp->t_state &= ~TS_BUSY;
 351         ttwwakeup(tp);
 352
 353         return 0;
 354 }
 355 cons_cinput(char ch)
 356 {
 357         struct tty *tp = &cons;
 358         boolean_t       funnel_state;
 359
 360
 361         (*linesw[tp->t_line].l_rint) (ch, tp);
 362
 363 }
 364