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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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