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authorJesse Barnes <jbarnes@virtuousgeek.org>2010-08-05 18:22:30 +0400
committerJason Wessel <jason.wessel@windriver.com>2010-08-05 18:22:30 +0400
commitb45cfba4e9005d64d419718e7ff7f7cab44c1994 (patch)
tree2d454a67c9a87ffc01579d958f9d95dd5e13170e /include/linux/console.h
parent3fa43aba08c5b5a4b407e402606fbe463239b14a (diff)
downloadlinux-b45cfba4e9005d64d419718e7ff7f7cab44c1994.tar.xz
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.h13
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)