xnu-1486.2.11.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 39a9b3e2b64b12a91909c1b9978e22f62c9d1bce..dbd46a1cc4712ba21f048365933848b24742bbfc 100644 (file)
--- a/bsd/dev/i386/cons.c
+++ b/bsd/dev/i386/cons.c
@@ -1,5 +1,5 @@
 /*
 /*

- * 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_OSREFERENCE_LICENSE_HEADER_START@
  * 


@@ -25,19 +25,27 @@
  * 
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
  * 
  * @APPLE_OSREFERENCE_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.
- */ 

 
 /*
 
 /*

- * 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>


@@ -47,246 +55,95 @@
 #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 */
 

-int cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp);
-int cnclose(__unused dev_t dev, int flag, int mode, struct proc *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];
+
+/*
+ * 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 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, int cmd, caddr_t addr, int flg, struct proc *p);
-int cnselect(__unused dev_t dev, int flag, void * wql, struct proc *p);
-
-void slave_cnenable(void);
-
-int alert(
-       __unused int width, 
-       __unused int height, 
-       __unused const char *title, 
-       const char *msg, 
-       int p1, int p2, int p3, int p4, int p5, int p6, int p7, int p8);
-int alert_done(void);
+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);

 
 

-/*ARGSUSED*/
-int
-cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp)
+static dev_t
+cndev(void)

 {
 {

-       dev_t device;
-       boolean_t funnel_state;
-       int error;
-       
-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-

        if (constty)
        if (constty)

-           device = constty->t_dev;
+               return constty->t_dev;

        else
        else

-           device = cons.t_dev;
-       error =  (*cdevsw[major(device)].d_open)(device, flag, devtype, pp);
-       thread_funnel_set(kernel_flock, funnel_state);
-
-       return(error);
+               return km_tty[0]->t_dev;

 }
 
 }
 

-/*ARGSUSED*/

 int
 int

-cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp)
+cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp)

 {
 {

-       dev_t device;
-       boolean_t funnel_state;
-       int error;
-
-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       error =  (*cdevsw[major(device)].d_close)(device, flag, mode, pp);
-       thread_funnel_set(kernel_flock, funnel_state);
-
-       return(error);
+       dev = cndev();
+       return ((*cdevsw[major(dev)].d_open)(dev, flag, devtype, pp));
+}

 
 
 
 

+int
+cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp)
+{
+       dev = cndev();
+       return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, pp));

 }
 
 }
 

-/*ARGSUSED*/
+

 int
 cnread(__unused dev_t dev, struct uio *uio, int ioflag)
 {
 int
 cnread(__unused dev_t dev, struct uio *uio, int ioflag)
 {

-       dev_t device;
-       boolean_t funnel_state;
-       int error;
-
-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       error = (*cdevsw[major(device)].d_read)(device, uio, ioflag);
-       thread_funnel_set(kernel_flock, funnel_state);
-
-       return(error);
+       dev = cndev();
+       return ((*cdevsw[major(dev)].d_read)(dev, uio, ioflag));

 }
 
 }
 

-/*ARGSUSED*/
+

 int
 cnwrite(__unused dev_t dev, struct uio *uio, int ioflag)
 {
 int
 cnwrite(__unused dev_t dev, struct uio *uio, int ioflag)
 {

-    dev_t device;
-       boolean_t funnel_state;
-       int error;
-
-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-    error =  (*cdevsw[major(device)].d_write)(device, uio, ioflag);
-       thread_funnel_set(kernel_flock, funnel_state);
-
-       return(error);
+       dev = cndev();
+       return ((*cdevsw[major(dev)].d_write)(dev, uio, ioflag));

 }
 
 }
 

-/*ARGSUSED*/
+

 int
 int

-cnioctl(__unused dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
+cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)

 {
 {

-       dev_t device;
-       boolean_t funnel_state;
-       int error;
-
-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
+       dev = cndev();
+#if 0

        /*
         * Superuser can always use this to wrest control of console
         * output from the "virtual" console.
        /*
         * 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) {
         */
        if ((unsigned) cmd == TIOCCONS && constty) {

-               error = proc_suser(p);
-               if (error) {
-                       goto out;
+               int error = proc_suser(p);
+               if (!error) {
+                       constty = NULL;

                }
                }

-               constty = NULL;
-               error = 0;
-               goto out;
+               return(error);

        }
        }

-       error =  (*cdevsw[major(device)].d_ioctl)(device, cmd, addr, flag, p);
-out:
-       thread_funnel_set(kernel_flock, funnel_state);
+#endif /* 0 */

 
 

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

 }
 
 }
 

-/*ARGSUSED*/
-/* called with funnel held */
-int
-cnselect(__unused 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()
+cnselect(__unused dev_t dev, int flag, void *wql, struct proc *p)

 {
 {

-       dev_t device;
-       boolean_t funnel_state;
-       int error;
-
-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       error =  (*cdevsw[major(device)].d_getc)(device);
-       thread_funnel_set(kernel_flock, funnel_state);
-
-       return(error);
+       dev = cndev();
+       return ((*cdevsw[major(dev)].d_select)(dev, flag, wql, p));

 }
 }

-
-/*ARGSUSED*/
-int
-cnputc(c)
-       char c;
-{
-       dev_t device;
-       boolean_t funnel_state;
-       int error;
-
-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-       if (constty)
-           device = constty->t_dev;
-       else
-           device = cons.t_dev;
-       error =  (*cdevsw[major(device)].d_putc)(device, c);
-       thread_funnel_set(kernel_flock, funnel_state);
-
-       return(error);
-}
-#endif
-
-void
-slave_cnenable(void)
-{
-       /* FIXME: what to do here? */
-}
-
-#if 0
-void
-kprintf( const char *format, ...)
-{
-        /* on PPC this outputs to the serial line */
-        /* nop on intel ... umeshv@apple.com */
-
-}
-#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(
-       __unused int width, 
-       __unused int height, 
-       __unused 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(void)
-{
-       /* DoRestore(); */
-       return 0;
-}
-