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| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-08-05 09:22:30 -0500 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2010-08-05 09:22:30 -0500 |
| commit | b45cfba4e9005d64d419718e7ff7f7cab44c1994 (patch) | |
| tree | 2d454a67c9a87ffc01579d958f9d95dd5e13170e /include/linux/console.h | |
| parent | 3fa43aba08c5b5a4b407e402606fbe463239b14a (diff) | |
| download | lwn-b45cfba4e9005d64d419718e7ff7f7cab44c1994.tar.gz lwn-b45cfba4e9005d64d419718e7ff7f7cab44c1994.zip | |
vt,console,kdb: implement atomic console enter/leave functions
These functions allow the kernel debugger to save and restore the
state of the system console.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
CC: David Airlie <airlied@linux.ie>
CC: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/console.h')
| -rw-r--r-- | include/linux/console.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/console.h b/include/linux/console.h index dcca5339ceb3..f76fc297322d 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -55,6 +55,16 @@ struct consw { void (*con_invert_region)(struct vc_data *, u16 *, int); u16 *(*con_screen_pos)(struct vc_data *, int); unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *); + /* + * Prepare the console for the debugger. This includes, but is not + * limited to, unblanking the console, loading an appropriate + * palette, and allowing debugger generated output. + */ + int (*con_debug_enter)(struct vc_data *); + /* + * Restore the console to its pre-debug state as closely as possible. + */ + int (*con_debug_leave)(struct vc_data *); }; extern const struct consw *conswitchp; @@ -69,6 +79,9 @@ int register_con_driver(const struct consw *csw, int first, int last); int unregister_con_driver(const struct consw *csw); int take_over_console(const struct consw *sw, int first, int last, int deflt); void give_up_console(const struct consw *sw); +int con_debug_enter(struct vc_data *vc); +int con_debug_leave(void); + /* scroll */ #define SM_UP (1) #define SM_DOWN (2) |