[PATCH 4/16] vt-printk-color.diff

Jan Engelhardt
2007-04-01T18:14:38Z

Colored kernel message output

Gives kernel messages on the console an OpenBSD-esque color to distinguish
them from regular tty (as long as that's not colored too) text.

Inspired by cko (iirc http://freshmeat.net/p/cko/), but better
implementation done by myself (handles newlines correctly).

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>

Kconfig | 28 ++++++++++++++++++++++++++++
vt.c | 22 ++++++++++++++++++++++
2 files changed, 50 insertions(+)

Index: linux-2.6.21-rc5/drivers/char/Kconfig
===================================================================
--- linux-2.6.21-rc5.orig/drivers/char/Kconfig
+++ linux-2.6.21-rc5/drivers/char/Kconfig
@@ -57,6 +57,34 @@ config VT_CONSOLE

If unsure, say Y.

+config VT_CKO
+ hex "Colored kernel message output"
+ range 0x00 0xFF
+ depends on VT_CONSOLE
+ default 0x17
+ ---help---
+ This option will give you ability to change the color of
+ kernel messages.
+
+ The value you need to enter here is the ASCII color value
+ composed (OR'ed) by one foreground color, one background
+ color and any number of attributes as follows:
+
+ Foreground: Background: Attributes:
+ 0x01 blue 0x10 blue 0x08 highlight foreground
+ 0x02 green 0x20 green 0x80 blinking foreground
+ 0x03 cyan 0x30 cyan
+ 0x04 red 0x40 red
+ 0x05 magenta 0x50 red
+ 0x06 brown 0x60 brown
+ 0x07 gray 0x70 gray
+
+ Thus, 0x17 will yield gray-on-blue like you can see in
+ OpenBSD, 0x02 the green-on-black like on NetBSD.
+ Using "highlight foreground" does not work when you use
+ VGA Console and fonts with 512 glyphs.
+ VGA Framebuffer is not affected.
+
config HW_CONSOLE
bool
depends on VT && !S390 && !UML
Index: linux-2.6.21-rc5/drivers/char/vt.c
===================================================================
--- linux-2.6.21-rc5.orig/drivers/char/vt.c
+++ linux-2.6.21-rc5/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>
@@ -2234,6 +2235,17 @@ struct tty_driver *console_driver;

#ifdef CONFIG_VT_CONSOLE

+static unsigned int cko_color = CONFIG_VT_CKO;
+
+static __init int set_cko(char *str)
+{
+ cko_color = simple_strtoul(str, NULL, 0);
+ return 1;
+}
+
+__setup("cko=", set_cko);
+module_param(cko_color, uint, S_IRUGO | S_IWUSR);
+
/*
* Console on virtual terminal
*
@@ -2274,12 +2286,16 @@ static void vt_console_print(struct cons
hide_cursor(vc);

start = (ushort *)vc->vc_pos;
+ vc->vc_color = cko_color;
+ update_attr(vc);

/* Contrived structure to try to emulate original need_wrap behaviour
* Problems caused when we have need_wrap set on '\n' character */
while (count--) {
c = *b++;
if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
+ vc->vc_color = vc->vc_def_color;
+ update_attr(vc);
if (cnt > 0) {
if (CON_IS_VISIBLE(vc))
vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
@@ -2292,6 +2308,8 @@ static void vt_console_print(struct cons
bs(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
+ vc->vc_color = cko_color;
+ update_attr(vc);
continue;
}
if (c != 13)
@@ -2299,6 +2317,8 @@ static void vt_console_print(struct cons
cr(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
+ vc->vc_color = cko_color;
+ update_attr(vc);
if (c == 10 || c == 13)
continue;
}
@@ -2320,6 +2340,8 @@ static void vt_console_print(struct cons
vc->vc_need_wrap = 1;
}
}
+ vc->vc_color = vc->vc_def_color;
+ update_attr(vc);
set_cursor(vc);

quit:
#<EOF>