xnu-4903.270.47.tar.gz

[apple/xnu.git] / bsd / dev / i386 / cons.c

diff --git a/bsd/dev/i386/cons.c b/bsd/dev/i386/cons.c
index c2122a600e20b7926f34b12fafdbc6a8be6f7aa0..8a9ee52551037df78fa2714363919ae0da7caab5 100644 (file)
--- a/bsd/dev/i386/cons.c
+++ b/bsd/dev/i386/cons.c
@@ -1,17 +1,20 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  *
  *

- * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
- * 

  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in

- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- * 
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *

  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,


@@ -19,22 +22,30 @@
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.

- * 
- * @APPLE_LICENSE_HEADER_END@
- */
-/* 
- * Copyright (c) 1987, 1988 NeXT, Inc.

  *
  *

- * HISTORY
- *  7-Jan-93  Mac Gillon (mgillon) at NeXT
- *     Integrated POSIX support
- *
- * 12-Aug-87  John Seamons (jks) at NeXT
- *     Ported to NeXT.
- */ 
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */

 
 /*
 
 /*

- * Indirect driver for console.
+ * Indirect driver for console
+ *
+ * The purpose of this driver is to provide a device node indirection for
+ * the console device, which can be any tty class device.  It does this by
+ * externalizing a global pointer "constty", which is then pointed at the
+ * console tty device.
+ *
+ * The default for this pointer is uninitialized; when it is NULL, we fall
+ * back to the "km" device, which is a tty BSD wrapper device for the
+ * Platform Expert console device.  When it is non-NULL, we call through
+ * to the tty device device instead.
+ *
+ * The registration for this device node is static, and the devfs init
+ * code does not externalize a named device for it, to avoid software
+ * seeing the device and trying to open it.
+ *
+ * The upshot of this is that the console driver should not be set as your
+ * controlling tty, since you will get a reference to a device which does
+ * not have an actual device node in /dev, so its name cannot be looked up.

  */
 #include <sys/param.h>
 #include <sys/systm.h>
  */
 #include <sys/param.h>
 #include <sys/systm.h>


@@ -44,201 +55,96 @@
 #include <sys/proc.h>
 #include <sys/uio.h>
 
 #include <sys/proc.h>
 #include <sys/uio.h>
 

-struct tty     cons;
-struct tty     *constty;               /* current console device */
+struct tty      *constty;               /* current console device */

 
 

-/*ARGSUSED*/
-int
-cnopen(dev, flag, devtype, pp)
-       dev_t dev;
-       int flag, devtype;
-       struct proc *pp;
-{
-       dev_t device;
-
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       return ((*cdevsw[major(device)].d_open)(device, flag, devtype, pp));
-}
+/*
+ * The km driver supplied the default console device for the systems
+ * (usually a raw frame buffer driver, but potentially a serial driver).
+ */
+extern struct tty *km_tty[1];

 
 

-/*ARGSUSED*/
-int
-cnclose(dev, flag, mode, pp)
-       dev_t dev;
-       int flag, mode;
-       struct proc *pp;
+/*
+ * cdevsw[] entries for the console device driver
+ */
+int cnopen(__unused dev_t dev, int flag, int devtype, proc_t pp);
+int cnclose(__unused dev_t dev, int flag, int mode, proc_t pp);
+int cnread(__unused dev_t dev, struct uio *uio, int ioflag);
+int cnwrite(__unused dev_t dev, struct uio *uio, int ioflag);
+int cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flg, proc_t p);
+int cnselect(__unused dev_t dev, int flag, void * wql, proc_t p);
+
+static dev_t
+cndev(void)

 {
 {

-       dev_t device;
-
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       return ((*cdevsw[major(device)].d_close)(device, flag, mode, pp));
+       if (constty) {
+               return constty->t_dev;
+       } else {
+               return km_tty[0]->t_dev;
+       }

 }
 
 }
 

-/*ARGSUSED*/

 int
 int

-cnread(dev, uio, ioflag)
-       dev_t dev;
-       struct uio *uio;
-       int ioflag;
+cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp)

 {
 {

-       dev_t device;
-
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       return ((*cdevsw[major(device)].d_read)(device, uio, ioflag));
+       dev = cndev();
+       return (*cdevsw[major(dev)].d_open)(dev, flag, devtype, pp);

 }
 
 }
 

-/*ARGSUSED*/
-int
-cnwrite(dev, uio, ioflag)
-       dev_t dev;
-       struct uio *uio;
-       int ioflag;
-{
-    dev_t device;

 
 

-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-    return ((*cdevsw[major(device)].d_write)(device, uio, ioflag));
-}
-
-/*ARGSUSED*/

 int
 int

-cnioctl(dev, cmd, addr, flag, p)
-       dev_t dev;
-       int cmd;
-       caddr_t addr;
-       int flag;
-       struct proc *p;
+cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp)

 {
 {

-       dev_t device;
-
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       /*
-        * Superuser can always use this to wrest control of console
-        * output from the "virtual" console.
-        */
-       if (cmd == TIOCCONS && constty) {
-               int error = suser(p->p_ucred, (u_short *) NULL);
-               if (error)
-                       return (error);
-               constty = NULL;
-               return (0);
-       }
-       return ((*cdevsw[major(device)].d_ioctl)(device, cmd, addr, flag, p));
+       dev = cndev();
+       return (*cdevsw[major(dev)].d_close)(dev, flag, mode, pp);

 }
 
 }
 

-/*ARGSUSED*/
-int
-cnselect(dev, flag, wql, p)
-       dev_t dev;
-       int flag;
-       void * wql;
-       struct proc *p;
-{
-       dev_t device;
-
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       return ((*cdevsw[major(device)].d_select)(device, flag, wql, p));
-}

 
 

-#if 0  /* FIXME  - using OSFMK console driver for the moment */

 int
 int

-cngetc()
+cnread(__unused dev_t dev, struct uio *uio, int ioflag)

 {
 {

-       dev_t device;
-
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       return ((*cdevsw[major(device)].d_getc)(device));
+       dev = cndev();
+       return (*cdevsw[major(dev)].d_read)(dev, uio, ioflag);

 }
 
 }
 

-/*ARGSUSED*/
+

 int
 int

-cnputc(c)
-       char c;
+cnwrite(__unused dev_t dev, struct uio *uio, int ioflag)

 {
 {

-       dev_t device;
-
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       return ((*cdevsw[major(device)].d_putc)(device, c));
+       dev = cndev();
+       return (*cdevsw[major(dev)].d_write)(dev, uio, ioflag);

 }
 }

-#endif

 
 

-#if    NCPUS > 1
-slave_cnenable()
-{
-       /* FIXME: what to do here? */
-}
-#endif NCPUS > 1

 
 

-#if 0
-void
-kprintf( const char *format, ...)
+int
+cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)

 {
 {

-        /* on PPC this outputs to the serial line */
-        /* nop on intel ... umeshv@apple.com */
+       dev = cndev();
+#if 0
+       /*
+        * Superuser can always use this to wrest control of console
+        * output from the "virtual" console.
+        *
+        * XXX Unfortunately, this code doesn't do what the author thougt
+        * XXX it did; use of the console device, a TIOCCONS would always
+        * XXX disassociate the console from a virtual terminal and send
+        * XXX it back to the fake tty.
+        */
+       if ((unsigned) cmd == TIOCCONS && constty) {
+               int error = proc_suser(p);
+               if (!error) {
+                       constty = NULL;
+               }
+               return error;
+       }
+#endif  /* 0 */

 
 

+       return (*cdevsw[major(dev)].d_ioctl)(dev, cmd, addr, flag, p);

 }
 }

-#endif

 
 

-/*
- * Write message to console; create an alert panel if no text-type window
- * currently exists. Caller must call alert_done() when finished.
- * The height and width arguments are not used; they are provided for 
- * compatibility with the 68k version of alert().
- */
-int 
-alert(
-       int width, 
-       int height, 
-       const char *title, 
-       const char *msg, 
-       int p1, 
-       int p2, 
-       int p3, 
-       int p4, 
-       int p5, 
-       int p6, 
-       int p7, 
-       int p8)
-{
-       char smsg[200];
-       
-       sprintf(smsg, msg,  p1, p2, p3, p4, p5, p6, p7, p8);
-#if FIXME  /* [ */
-       /* DoAlert(title, smsg); */
-#else
-       printf("%s\n",smsg);
-#endif  /* FIXME ] */
-
-       return 0;
-}

 
 

-int 
-alert_done()
+int
+cnselect(__unused dev_t dev, int flag, void *wql, struct proc *p)

 {
 {

-       /* DoRestore(); */
-       return 0;
+       dev = cndev();
+       return (*cdevsw[major(dev)].d_select)(dev, flag, wql, p);

 }
 }

-