add CONFIG_VT_UNICODE

As of now, the kernel defaults to non-unicode and XLATE for the keyboard.
We've been changing this in Fedora, but that requires patching the defaults
in the kernel.

The attached introduces CONFIG_VT_UNICODE, which sets the console in
unicode mode by default on boot, including both the virtual terminal and
the keyboard driver.

Signed-off-by: Bill Nottingham <notting@redhat.com>
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/Kconfig

@@ -36,6 +36,23 @@ config VT
 	  If unsure, say Y, or else you won't be able to do much with your new
 	  shiny Linux system :-)
 
+config VT_UNICODE
+	bool "Virtual console is Unicode by default"
+	depends on VT
+	default n
+	---help---
+	  If you say Y here, the virtual terminal will be in UTF-8 by default,
+	  and the keyboard will run in unicode mode.
+
+	  If you say N here, the virtual terminal will not be in UTF-8 by
+	  default, and the keyboard will run in XLATE mode.
+
+	  This can also be changed by passing 'default_utf8=<0|1>' on the
+	  kernel command line.
+
+	  Historically, the kernel has defaulted to non-UTF8 and XLATE mode.
+	  If unsure, say N here.
+
 config VT_CONSOLE
 	bool "Support for console on virtual terminal" if EMBEDDED
 	depends on VT

drivers/char/keyboard.c

@@ -1381,7 +1381,7 @@ int __init kbd_init(void)
 		kbd_table[i].lockstate = KBD_DEFLOCK;
 		kbd_table[i].slockstate = 0;
 		kbd_table[i].modeflags = KBD_DEFMODE;
-		kbd_table[i].kbdmode = VC_XLATE;
+		kbd_table[i].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
 	}
 
 	error = input_register_handler(&kbd_handler);

drivers/char/sysrq.c

@@ -108,12 +108,12 @@ static void sysrq_handle_unraw(int key, struct tty_struct *tty)
 	struct kbd_struct *kbd = &kbd_table[fg_console];
 
 	if (kbd)
-		kbd->kbdmode = VC_XLATE;
+		kbd->kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
 }
 static struct sysrq_key_op sysrq_unraw_op = {
 	.handler	= sysrq_handle_unraw,
 	.help_msg	= "unRaw",
-	.action_msg	= "Keyboard mode set to XLATE",
+	.action_msg	= "Keyboard mode set to system default",
 	.enable_mask	= SYSRQ_ENABLE_KEYBOARD,
 };
 #else

drivers/char/vt.c

@@ -158,7 +158,11 @@ static void blank_screen_t(unsigned long dummy);
 static void set_palette(struct vc_data *vc);
 
 static int printable;		/* Is console ready for printing? */
-static int default_utf8;
+#ifdef CONFIG_VT_UNICODE
+int default_utf8 = 1;
+#else
+int default_utf8;
+#endif
 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 
 /*

drivers/char/vt_ioctl.c

@@ -1125,7 +1125,7 @@ int vt_waitactive(int vt)
 void reset_vc(struct vc_data *vc)
 {
 	vc->vc_mode = KD_TEXT;
-	kbd_table[vc->vc_num].kbdmode = VC_XLATE;
+	kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
 	vc->vt_mode.mode = VT_AUTO;
 	vc->vt_mode.waitv = 0;
 	vc->vt_mode.relsig = 0;

include/linux/vt_kern.h

@@ -87,6 +87,7 @@ extern int unbind_con_driver(const struct consw *csw, int first, int last,
 extern char con_buf[CON_BUF_SIZE];
 extern struct mutex con_buf_mtx;
 extern char vt_dont_switch;
+extern int default_utf8;
 
 struct vt_spawn_console {
 	spinlock_t lock;