xnu-4570.1.46.tar.gz

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

diff --git a/bsd/dev/arm/cons.c b/bsd/dev/arm/cons.c
new file mode 100644 (file)
index 0000000..910c152
--- /dev/null
+++ b/bsd/dev/arm/cons.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
+ */
+/*
+ * 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.
+ */
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/ioctl.h>
+#include <sys/tty.h>
+#include <sys/proc.h>
+#include <sys/uio.h>
+
+struct tty     *constty;               /* current console device */
+
+/*
+ * 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, 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)
+{
+       if (constty)
+               return constty->t_dev;
+       else
+               return km_tty[0]->t_dev;
+}
+
+int
+cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp)
+{
+       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));
+}
+
+
+int
+cnread(__unused dev_t dev, struct uio *uio, int ioflag)
+{
+       dev = cndev();
+       return ((*cdevsw[major(dev)].d_read)(dev, uio, ioflag));
+}
+
+
+int
+cnwrite(__unused dev_t dev, struct uio *uio, int ioflag)
+{
+       dev = cndev();
+       return ((*cdevsw[major(dev)].d_write)(dev, uio, ioflag));
+}
+
+
+int
+cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
+{
+       dev = cndev();
+
+       /*
+        * XXX This check prevents the cons.c code from being shared between
+        * XXX all architectures; it is probably not needed on ARM, either,
+        * XXX but I have no test platforms or ability to run a kernel.
+        *
+        * Superuser can always use this to wrest control of console
+        * output from the "virtual" console.
+        */
+       if ((unsigned) cmd == TIOCCONS && constty) {
+               int             error = proc_suser(p);
+               if (error)
+                       return (error);
+               constty = NULL;
+               return (0);
+       }
+       return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, addr, flag, p));
+}
+
+
+int
+cnselect(__unused dev_t dev, int flag, void *wql, struct proc *p)
+{
+       dev = cndev();
+       return ((*cdevsw[major(dev)].d_select)(dev, flag, wql, p));
+}