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vt,console,kdb: implement atomic console enter/leave functions

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These functions allow the kernel debugger to save and restore the
state of the system console.

Signed-off-by: Jesse Barnes <[email protected]>
Signed-off-by: Jason Wessel <[email protected]>
CC: David Airlie <[email protected]>
CC: Andrew Morton <[email protected]>
This commit is contained in:
Jesse Barnes authored and Jason Wessel committed 2010-08-05 09:22:30 -05:00
1 parent 3fa43aba08
commit b45cfba4e9
2 files changed
+74
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include/linux/console.h
+13
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@@ -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)