X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0b4e3aa066abc0728aacb4bbeb86f53f9737156e..refs/heads/master:/bsd/dev/i386/cons.c?ds=inline

diff --git a/bsd/dev/i386/cons.c b/bsd/dev/i386/cons.c
index 118878bd1..8a9ee5255 100644
--- a/bsd/dev/i386/cons.c
+++ b/bsd/dev/i386/cons.c
@@ -1,37 +1,51 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
- * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * 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. 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,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE 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.
+ * 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.
  *
- * 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>
@@ -41,201 +55,96 @@
 #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
-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
-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
-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
-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);
 }
-