bsd/dev/i386/km.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*      Copyright (c) 1992 NeXT Computer, Inc.  All rights reserved.
  23  *
  24  * km.m - kernel keyboard/monitor module, procedural interface.
  25  *
  26  * HISTORY
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/tty.h>
  31
  32 #include <dev/i386/cons.h>
  33 #include <sys/conf.h>
  34 #include <sys/systm.h>
  35 #include <sys/uio.h>
  36 #include <sys/fcntl.h>          /* for kmopen */
  37 #include <sys/errno.h>
  38 #include <sys/proc.h>           /* for kmopen */
  39 #include <sys/msgbuf.h>
  40 #include <sys/time.h>
  41 #include <dev/kmreg_com.h>
  42 #include <pexpert/pexpert.h>
  43
  44 /*
  45  * 'Global' variables, shared only by this file and conf.c.
  46  */
  47 extern struct tty       cons;
  48 struct tty *km_tty[1] = { &cons };
  49
  50 /*
  51  * this works early on, after initialize_screen() but before autoconf (and thus
  52  * before we have a kmDevice).
  53  */
  54 int disableConsoleOutput;
  55
  56 /*
  57  * 'Global' variables, shared only by this file and kmDevice.m.
  58  */
  59 int initialized = 0;
  60
  61 static int kmoutput(struct tty *tp);
  62 static void kmtimeout(struct tty *tp);
  63 static void kmstart(struct tty *tp);
  64
  65 extern void KeyboardOpen(void);
  66
  67 int kminit()
  68 {
  69          cons.t_dev = makedev(12, 0);
  70         initialized = 1;
  71 }
  72 /*
  73  * cdevsw interface to km driver.
  74  */
  75 int
  76 kmopen(
  77         dev_t dev,
  78         int flag,
  79         int devtype,
  80         struct proc *pp)
  81 {
  82         int rtn;
  83         int unit;
  84         struct tty *tp;
  85         struct winsize *wp;
  86         int ret;
  87
  88         unit = minor(dev);
  89         if(unit >= 1)
  90                 return (ENXIO);
  91
  92         tp = (struct tty *)&cons;
  93         tp->t_oproc = kmstart;
  94         tp->t_param = NULL;
  95         tp->t_dev = dev;
  96
  97         if ( !(tp->t_state & TS_ISOPEN) ) {
  98                 tp->t_iflag = TTYDEF_IFLAG;
  99                 tp->t_oflag = TTYDEF_OFLAG;
 100                 tp->t_cflag = (CREAD | CS8 | CLOCAL);
 101                 tp->t_lflag = TTYDEF_LFLAG;
 102                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
 103                 termioschars(&tp->t_termios);
 104                 ttsetwater(tp);
 105         } else if ((tp->t_state & TS_XCLUDE) && pp->p_ucred->cr_uid != 0)
 106                 return EBUSY;
 107
 108         tp->t_state |= TS_CARR_ON; /* lie and say carrier exists and is on. */
 109         ret = ((*linesw[tp->t_line].l_open)(dev, tp));
 110         {
 111                 PE_Video video;
 112                 wp = &tp->t_winsize;
 113                 /* Magic numbers.  These are CHARWIDTH and CHARHEIGHT
 114                  * from pexpert/i386/video_console.c
 115                  */
 116                 wp->ws_xpixel = 8;
 117                 wp->ws_ypixel = 16;
 118
 119                 if (flag & O_POPUP)
 120                         PE_initialize_console(0, kPETextScreen);
 121
 122                 bzero(&video, sizeof(video));
 123                 PE_current_console(&video);
 124                 if( video.v_width != 0 && video.v_height != 0 ) {
 125                         wp->ws_col = video.v_width / wp->ws_xpixel;
 126                         wp->ws_row = video.v_height / wp->ws_ypixel;
 127                 } else {
 128                         wp->ws_col = 100;
 129                         wp->ws_row = 36;
 130                 }
 131         }
 132         return ret;
 133 }
 134
 135 int
 136 kmclose(
 137         dev_t dev,
 138         int flag,
 139         int mode,
 140         struct proc *p)
 141 {
 142
 143         struct tty *tp;
 144
 145         tp = &cons;
 146         (*linesw[tp->t_line].l_close)(tp,flag);
 147         ttyclose(tp);
 148         return (0);
 149 }
 150
 151 int
 152 kmread(
 153         dev_t dev,
 154         struct uio *uio,
 155         int ioflag)
 156 {
 157         register struct tty *tp;
 158
 159         tp = &cons;
 160         return ((*linesw[tp->t_line].l_read)(tp, uio, ioflag));
 161 }
 162
 163 int
 164 kmwrite(
 165         dev_t dev,
 166         struct uio *uio,
 167         int ioflag)
 168 {
 169         register struct tty *tp;
 170
 171         tp = &cons;
 172         return ((*linesw[tp->t_line].l_write)(tp, uio, ioflag));
 173 }
 174
 175 int
 176 kmioctl(
 177         dev_t dev,
 178         int cmd,
 179         caddr_t data,
 180         int flag,
 181         struct proc *p)
 182 {
 183         int error;
 184         struct tty *tp = &cons;
 185         struct winsize *wp;
 186
 187         switch (cmd) {
 188
 189
 190
 191             case KMIOCSIZE:
 192                 wp = (struct winsize *)data;
 193                 *wp = tp->t_winsize;
 194                 return 0;
 195
 196             case TIOCSWINSZ:
 197                 /* Prevent changing of console size --
 198                  * this ensures that login doesn't revert to the
 199                  * termcap-defined size
 200                  */
 201                 return EINVAL;
 202
 203             /* Bodge in the CLOCAL flag as the km device is always local */
 204             case TIOCSETA:
 205             case TIOCSETAW:
 206             case TIOCSETAF: {
 207                 register struct termios *t = (struct termios *)data;
 208                 t->c_cflag |= CLOCAL;
 209                 /* No Break */
 210             }
 211             default:
 212                 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
 213                 if (error >= 0) {
 214                         return error;
 215                 }
 216                 error = ttioctl (tp, cmd, data, flag, p);
 217                 if (error >= 0) {
 218                         return error;
 219                 }
 220                 else {
 221                         return ENOTTY;
 222                 }
 223         }
 224 }
 225
 226 int
 227 kmputc(
 228         int c)
 229 {
 230
 231         if( disableConsoleOutput)
 232                 return( 0);
 233
 234         if(!initialized)
 235                 return( 0);
 236
 237         if(c == '\n')
 238                 cnputc('\r');
 239
 240         cnputc(c);
 241
 242         return 0;
 243 }
 244
 245 int
 246 kmgetc(
 247         dev_t dev)
 248 {
 249         int c;
 250
 251         c= cngetc();
 252
 253         if (c == '\r') {
 254                 c = '\n';
 255         }
 256         cnputc(c);
 257         return c;
 258 }
 259
 260 int
 261 kmgetc_silent(
 262         dev_t dev)
 263 {
 264         int c;
 265
 266         c= cngetc();
 267         if (c == '\r') {
 268                 c = '\n';
 269         }
 270         return c;
 271 }
 272
 273 /*
 274  * Callouts from linesw.
 275  */
 276
 277 #define KM_LOWAT_DELAY  ((ns_time_t)1000)
 278
 279 static void
 280 kmstart(
 281         struct tty *tp)
 282 {
 283         extern int hz;
 284         if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP))
 285                 goto out;
 286         if (tp->t_outq.c_cc == 0)
 287                 goto out;
 288         tp->t_state |= TS_BUSY;
 289         if (tp->t_outq.c_cc > tp->t_lowat) {
 290                 /*
 291                  * Start immediately.
 292                  */
 293                 kmoutput(tp);
 294         }
 295         else {
 296                 /*
 297                  * Wait a bit...
 298                  */
 299 #if 0
 300                 /* FIXME */
 301                 timeout(kmtimeout, tp, hz);
 302 #else
 303                 kmoutput(tp);
 304 #endif
 305         }
 306 out:
 307         ttwwakeup(tp);
 308 }
 309
 310 static void
 311 kmtimeout( struct tty *tp)
 312 {
 313         boolean_t       funnel_state;
 314
 315         funnel_state = thread_funnel_set(kernel_flock, TRUE);
 316         kmoutput(tp);
 317         (void) thread_funnel_set(kernel_flock, funnel_state);
 318
 319
 320 }
 321 static int
 322 kmoutput(
 323         struct tty *tp)
 324 {
 325         /*
 326          * FIXME - to be grokked...copied from m68k km.c.
 327          */
 328         char            buf[80];
 329         char            *cp;
 330         int             cc = -1;
 331         extern int hz;
 332
 333
 334         while (tp->t_outq.c_cc > 0) {
 335                 cc = ndqb(&tp->t_outq, 0);
 336                 if (cc == 0)
 337                         break;
 338                 cc = min(cc, sizeof buf);
 339                 (void) q_to_b(&tp->t_outq, buf, cc);
 340                 for (cp = buf; cp < &buf[cc]; cp++) {
 341                     kmputc(*cp & 0x7f);
 342                 }
 343         }
 344         if (tp->t_outq.c_cc > 0) {
 345                 timeout(kmtimeout, tp, hz);
 346         }
 347         tp->t_state &= ~TS_BUSY;
 348         ttwwakeup(tp);
 349
 350         return 0;
 351 }
 352 cons_cinput(char ch)
 353 {
 354         struct tty *tp = &cons;
 355         boolean_t       funnel_state;
 356
 357
 358         (*linesw[tp->t_line].l_rint) (ch, tp);
 359
 360 }
 361