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Subject[1/3] Re: Colored Kernel Output for 2.6.25
commit 15e3809bd3b6596158263301a344c1fdf281e11d
Author: Jan Engelhardt <jengelh@computergmbh.de>
Date: Sun Apr 27 03:17:51 2008 +0200

Colored kernel message output (1/3)

This patch makes it possible to give kernel messages a selectable
color. It can be chosen at compile time, overridden at boot time,
and changed at run time.

References:
http://lkml.org/lkml/2007/4/1/162
http://lkml.org/lkml/2007/10/5/199
http://lkml.org/lkml/2007/10/6/88
http://lkml.org/lkml/2007/10/6/89

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
---
drivers/char/Kconfig | 43 ++++++++++++++++++++++++++++++++++++++++++
drivers/char/vt.c | 21 ++++++++++++++++++++
2 files changed, 64 insertions(+), 0 deletions(-)

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 47c6be8..a55a1c9 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -58,6 +58,49 @@ config VT_CONSOLE

If unsure, say Y.

+config VT_CKO
+ bool "Colored kernel message output"
+ depends on VT_CONSOLE
+ ---help---
+ This option enables kernel messages to be emitted in
+ colors other than the default.
+ This option enlarges your kernel by approximately 1/2 KB.
+
+ If unsure, say N.
+
+config VT_PRINTK_COLOR
+ hex "Colored kernel message output"
+ range 0x00 0xFF
+ depends on VT_CKO
+ default 0x07
+ ---help---
+ This option defines with which color kernel messages will be
+ printed to the console.
+
+ The value you need to enter here is the value is composed
+ (OR-ed) of a foreground and a background color.
+
+ Foreground:
+ 0x00 = black, 0x08 = dark gray,
+ 0x01 = red, 0x09 = light red,
+ 0x02 = green, 0x0A = light green,
+ 0x03 = brown, 0x0B = yellow,
+ 0x04 = blue, 0x0C = light blue,
+ 0x05 = magenta, 0x0D = light magenta,
+ 0x06 = cyan, 0x0E = light cyan,
+ 0x07 = gray, 0x0F = white,
+
+ (Foreground colors 0x08 to 0x0F do not work when a VGA
+ console font with 512 glyphs is used.)
+
+ Background:
+ 0x00 = black, 0x40 = blue,
+ 0x10 = red, 0x50 = magenta,
+ 0x20 = green, 0x60 = cyan,
+ 0x30 = brown, 0x70 = gray,
+
+ For example, 0x1F would yield white on red.
+
config HW_CONSOLE
bool
depends on VT && !S390 && !UML
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 159c9e2..cf61236 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -73,6 +73,7 @@
*/

#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/tty.h>
@@ -2392,6 +2393,24 @@ struct tty_driver *console_driver;

#ifdef CONFIG_VT_CONSOLE

+#ifdef CONFIG_VT_CKO
+static unsigned int printk_color __read_mostly = CONFIG_VT_PRINTK_COLOR;
+module_param(printk_color, uint, S_IRUGO | S_IWUSR);
+
+static void vc_set_color(struct vc_data *vc, unsigned char color)
+{
+ vc->vc_color = color_table[color & 0xF] |
+ (color_table[(color >> 4) & 0x7] << 4) |
+ (color & 0x80);
+ update_attr(vc);
+}
+#else
+static const unsigned int printk_color;
+static inline void vc_set_color(const struct vc_data *vc, unsigned char c)
+{
+}
+#endif
+
/*
* Console on virtual terminal
*
@@ -2434,6 +2453,7 @@ static void vt_console_print(struct console *co, const char *b, unsigned count)
hide_cursor(vc);

start = (ushort *)vc->vc_pos;
+ vc_set_color(vc, printk_color);

/* Contrived structure to try to emulate original need_wrap behaviour
* Problems caused when we have need_wrap set on '\n' character */
@@ -2482,6 +2502,7 @@ static void vt_console_print(struct console *co, const char *b, unsigned count)
}
}
set_cursor(vc);
+ vc_set_color(vc, vc->vc_def_color);
notify_update(vc);

quit:

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