bsd/dev/i386/cons.c

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * Copyright (c) 1987, 1988 NeXT, Inc.
  32  *
  33  * HISTORY
  34  *  7-Jan-93  Mac Gillon (mgillon) at NeXT
  35  *      Integrated POSIX support
  36  *
  37  * 12-Aug-87  John Seamons (jks) at NeXT
  38  *      Ported to NeXT.
  39  */
  40
  41 /*
  42  * Indirect driver for console.
  43  */
  44 #include <sys/param.h>
  45 #include <sys/systm.h>
  46 #include <sys/conf.h>
  47 #include <sys/ioctl.h>
  48 #include <sys/tty.h>
  49 #include <sys/proc.h>
  50 #include <sys/uio.h>
  51
  52 struct tty      cons;
  53 struct tty      *constty;               /* current console device */
  54
  55 int cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp);
  56 int cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp);
  57 int cnread(__unused dev_t dev, struct uio *uio, int ioflag);
  58 int cnwrite(__unused dev_t dev, struct uio *uio, int ioflag);
  59 int cnioctl(__unused dev_t dev, int cmd, caddr_t addr, int flg, struct proc *p);
  60 int cnselect(__unused dev_t dev, int flag, void * wql, struct proc *p);
  61
  62 void slave_cnenable(void);
  63
  64 int alert(
  65         __unused int width,
  66         __unused int height,
  67         __unused const char *title,
  68         const char *msg,
  69         int p1, int p2, int p3, int p4, int p5, int p6, int p7, int p8);
  70 int alert_done(void);
  71
  72 /*ARGSUSED*/
  73 int
  74 cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp)
  75 {
  76         dev_t device;
  77         boolean_t funnel_state;
  78         int error;
  79
  80         funnel_state = thread_funnel_set(kernel_flock, TRUE);
  81
  82         if (constty)
  83             device = constty->t_dev;
  84         else
  85             device = cons.t_dev;
  86         error =  (*cdevsw[major(device)].d_open)(device, flag, devtype, pp);
  87         thread_funnel_set(kernel_flock, funnel_state);
  88
  89         return(error);
  90 }
  91
  92 /*ARGSUSED*/
  93 int
  94 cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp)
  95 {
  96         dev_t device;
  97         boolean_t funnel_state;
  98         int error;
  99
 100         funnel_state = thread_funnel_set(kernel_flock, TRUE);
 101         if (constty)
 102             device = constty->t_dev;
 103         else
 104             device = cons.t_dev;
 105         error =  (*cdevsw[major(device)].d_close)(device, flag, mode, pp);
 106         thread_funnel_set(kernel_flock, funnel_state);
 107
 108         return(error);
 109
 110
 111 }
 112
 113 /*ARGSUSED*/
 114 int
 115 cnread(__unused dev_t dev, struct uio *uio, int ioflag)
 116 {
 117         dev_t device;
 118         boolean_t funnel_state;
 119         int error;
 120
 121         funnel_state = thread_funnel_set(kernel_flock, TRUE);
 122         if (constty)
 123             device = constty->t_dev;
 124         else
 125             device = cons.t_dev;
 126         error = (*cdevsw[major(device)].d_read)(device, uio, ioflag);
 127         thread_funnel_set(kernel_flock, funnel_state);
 128
 129         return(error);
 130 }
 131
 132 /*ARGSUSED*/
 133 int
 134 cnwrite(__unused dev_t dev, struct uio *uio, int ioflag)
 135 {
 136     dev_t device;
 137         boolean_t funnel_state;
 138         int error;
 139
 140         funnel_state = thread_funnel_set(kernel_flock, TRUE);
 141         if (constty)
 142             device = constty->t_dev;
 143         else
 144             device = cons.t_dev;
 145     error =  (*cdevsw[major(device)].d_write)(device, uio, ioflag);
 146         thread_funnel_set(kernel_flock, funnel_state);
 147
 148         return(error);
 149 }
 150
 151 /*ARGSUSED*/
 152 int
 153 cnioctl(__unused dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
 154 {
 155         dev_t device;
 156         boolean_t funnel_state;
 157         int error;
 158
 159         funnel_state = thread_funnel_set(kernel_flock, TRUE);
 160
 161         if (constty)
 162             device = constty->t_dev;
 163         else
 164             device = cons.t_dev;
 165         /*
 166          * Superuser can always use this to wrest control of console
 167          * output from the "virtual" console.
 168          */
 169         if ((unsigned) cmd == TIOCCONS && constty) {
 170                 error = proc_suser(p);
 171                 if (error) {
 172                         goto out;
 173                 }
 174                 constty = NULL;
 175                 error = 0;
 176                 goto out;
 177         }
 178         error =  (*cdevsw[major(device)].d_ioctl)(device, cmd, addr, flag, p);
 179 out:
 180         thread_funnel_set(kernel_flock, funnel_state);
 181
 182         return(error);
 183 }
 184
 185 /*ARGSUSED*/
 186 /* called with funnel held */
 187 int
 188 cnselect(__unused dev_t dev, int flag, void * wql, struct proc *p)
 189 {
 190         dev_t device;
 191
 192         if (constty)
 193             device = constty->t_dev;
 194         else
 195             device = cons.t_dev;
 196         return ((*cdevsw[major(device)].d_select)(device, flag, wql, p));
 197 }
 198
 199 #if 0   /* FIXME  - using OSFMK console driver for the moment */
 200 int
 201 cngetc()
 202 {
 203         dev_t device;
 204         boolean_t funnel_state;
 205         int error;
 206
 207         funnel_state = thread_funnel_set(kernel_flock, TRUE);
 208         if (constty)
 209             device = constty->t_dev;
 210         else
 211             device = cons.t_dev;
 212         error =  (*cdevsw[major(device)].d_getc)(device);
 213         thread_funnel_set(kernel_flock, funnel_state);
 214
 215         return(error);
 216 }
 217
 218 /*ARGSUSED*/
 219 int
 220 cnputc(c)
 221         char c;
 222 {
 223         dev_t device;
 224         boolean_t funnel_state;
 225         int error;
 226
 227         funnel_state = thread_funnel_set(kernel_flock, TRUE);
 228         if (constty)
 229             device = constty->t_dev;
 230         else
 231             device = cons.t_dev;
 232         error =  (*cdevsw[major(device)].d_putc)(device, c);
 233         thread_funnel_set(kernel_flock, funnel_state);
 234
 235         return(error);
 236 }
 237 #endif
 238
 239 void
 240 slave_cnenable(void)
 241 {
 242         /* FIXME: what to do here? */
 243 }
 244
 245 #if 0
 246 void
 247 kprintf( const char *format, ...)
 248 {
 249         /* on PPC this outputs to the serial line */
 250         /* nop on intel ... umeshv@apple.com */
 251
 252 }
 253 #endif
 254
 255 /*
 256  * Write message to console; create an alert panel if no text-type window
 257  * currently exists. Caller must call alert_done() when finished.
 258  * The height and width arguments are not used; they are provided for
 259  * compatibility with the 68k version of alert().
 260  */
 261 int
 262 alert(
 263         __unused int width,
 264         __unused int height,
 265         __unused const char *title,
 266         const char *msg,
 267         int p1,
 268         int p2,
 269         int p3,
 270         int p4,
 271         int p5,
 272         int p6,
 273         int p7,
 274         int p8)
 275 {
 276         char smsg[200];
 277
 278         sprintf(smsg, msg,  p1, p2, p3, p4, p5, p6, p7, p8);
 279 #if FIXME  /* [ */
 280         /* DoAlert(title, smsg); */
 281 #else
 282         printf("%s\n",smsg);
 283 #endif  /* FIXME ] */
 284
 285         return 0;
 286 }
 287
 288 int
 289 alert_done(void)
 290 {
 291         /* DoRestore(); */
 292         return 0;
 293 }
 294