/*
- * 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_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/proc.h>
#include <sys/uio.h>
-struct tty cons;
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 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)
- device = constty->t_dev;
+ return constty->t_dev;
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
-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)
{
- 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)
{
- 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
-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.
+ *
+ * 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) {
- 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
-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;
-}
-
projects / apple / xnu.git / blobdiff