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Subject[PATCH 1/2] Colored kernel output (run3)

Colored kernel message output (1/2)

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

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

---
drivers/char/Kconfig | 42 ++++++++++++++++++++++++++++++++++++++++++
drivers/char/vt.c | 23 +++++++++++++++++++++++
2 files changed, 65 insertions(+)

Index: linux-2.6.23/drivers/char/Kconfig
===================================================================
--- linux-2.6.23.orig/drivers/char/Kconfig
+++ linux-2.6.23/drivers/char/Kconfig
@@ -58,6 +58,48 @@ 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.
+
+ 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
Index: linux-2.6.23/drivers/char/vt.c
===================================================================
--- linux-2.6.23.orig/drivers/char/vt.c
+++ linux-2.6.23/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>
@@ -2344,6 +2345,23 @@ struct tty_driver *console_driver;

#ifdef CONFIG_VT_CONSOLE

+static unsigned int printk_color __read_mostly = CONFIG_VT_PRINTK_COLOR;
+#ifdef CONFIG_VT_CKO
+module_param(printk_color, uint, S_IRUGO | S_IWUSR);
+
+static inline 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 inline void vc_set_color(const struct vc_data *vc, unsigned char c)
+{
+}
+#endif
+
/*
* Console on virtual terminal
*
@@ -2384,12 +2402,14 @@ static void vt_console_print(struct cons
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 */
while (count--) {
c = *b++;
if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
+ vc_set_color(vc, vc->vc_def_color);
if (cnt > 0) {
if (CON_IS_VISIBLE(vc))
vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
@@ -2402,6 +2422,7 @@ static void vt_console_print(struct cons
bs(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
+ vc_set_color(vc, printk_color);
continue;
}
if (c != 13)
@@ -2409,6 +2430,7 @@ static void vt_console_print(struct cons
cr(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
+ vc_set_color(vc, printk_color);
if (c == 10 || c == 13)
continue;
}
@@ -2430,6 +2452,7 @@ static void vt_console_print(struct cons
vc->vc_need_wrap = 1;
}
}
+ vc_set_color(vc, vc->vc_def_color);
set_cursor(vc);

quit:
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