bsd/dev/ppc/cons.c

   1 /*
   2  * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_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 License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1987, 1988 NeXT, Inc.
  30  *
  31  * HISTORY
  32  *  7-Jan-93  Mac Gillon (mgillon) at NeXT
  33  *      Integrated POSIX support
  34  *
  35  * 12-Aug-87  John Seamons (jks) at NeXT
  36  *      Ported to NeXT.
  37  */
  38
  39 /*
  40  * Indirect driver for console.
  41  */
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/conf.h>
  45 #include <sys/ioctl.h>
  46 #include <sys/tty.h>
  47 #include <sys/proc.h>
  48 #include <sys/uio.h>
  49 #include <machine/cons.h>
  50
  51 struct tty      *constty;       /* current console device */
  52
  53 /*
  54  * The km driver supplied the default console device for the systems
  55  * (usually a raw frame buffer driver, but potentially a serial driver).
  56  */
  57 extern struct tty *km_tty[1];
  58
  59 static dev_t
  60 cndev(void)
  61 {
  62         if (constty)
  63                 return constty->t_dev;
  64         else
  65                 return km_tty[0]->t_dev;
  66 }
  67
  68 /*ARGSUSED*/
  69 int
  70 consopen(__unused dev_t dev, int flag, int devtype, struct proc *pp)
  71 {
  72         dev = cndev();
  73         return ((*cdevsw[major(dev)].d_open)(dev, flag, devtype, pp));
  74 }
  75
  76
  77 /*ARGSUSED*/
  78 int
  79 consclose(__unused dev_t dev, int flag, int mode, struct proc *pp)
  80 {
  81         dev = cndev();
  82         return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, pp));
  83 }
  84
  85
  86 /*ARGSUSED*/
  87 int
  88 consread(__unused dev_t dev, struct uio *uio, int ioflag)
  89 {
  90         dev = cndev();
  91         return ((*cdevsw[major(dev)].d_read)(dev, uio, ioflag));
  92 }
  93
  94
  95 /*ARGSUSED*/
  96 int
  97 conswrite(__unused dev_t dev, struct uio *uio, int ioflag)
  98 {
  99         dev = cndev();
 100         return ((*cdevsw[major(dev)].d_write)(dev, uio, ioflag));
 101 }
 102
 103
 104 /*ARGSUSED*/
 105 int
 106 consioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
 107 {
 108         dev = cndev();
 109 #if 0
 110         /*
 111          * Superuser can always use this to wrest control of console
 112          * output from the "virtual" console.
 113          *
 114          * XXX Unfortunately, this code doesn't do what the author thougt
 115          * XXX it did; use of the console device, a TIOCCONS would always
 116          * XXX disassociate the console from a virtual terminal and send
 117          * XXX it back to the fake tty.
 118          */
 119         if ((unsigned) cmd == TIOCCONS && constty) {
 120                 int error = proc_suser(p);
 121                 if (!error) {
 122                         constty = NULL;
 123                 }
 124                 return(error);
 125         }
 126 #endif  /* 0 */
 127
 128         return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, addr, flag, p));
 129 }
 130
 131
 132 /*ARGSUSED*/
 133 /* called with funnel held */
 134 int
 135 consselect(__unused dev_t dev, int flag, void *wql, struct proc *p)
 136 {
 137         dev = cndev();
 138         return ((*cdevsw[major(dev)].d_select)(dev, flag, wql, p));
 139 }