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/******************************************************************************
* keyhandler.h
*
* We keep an array of 'handlers' for each key code between 0 and 255;
* this is intended to allow very simple debugging routines (toggle
* debug flag, dump registers, reboot, etc) to be hooked in in a slightly
* nicer fashion than just editing the serial/keyboard drivers.
*/
#ifndef __XEN_KEYHANDLER_H__
#define __XEN_KEYHANDLER_H__
typedef void keyhandler_fn_t(
unsigned char key);
typedef void irq_keyhandler_fn_t(
unsigned char key, struct cpu_user_regs *regs);
struct keyhandler {
/*
* If TRUE then u.irq_fn is called in hardirq context with interrupts
* disabled. The @regs callback parameter points at the interrupted
* register context.
* If FALSE then u.fn is called in softirq context with no locks held and
* interrupts enabled.
*/
bool_t irq_callback;
/*
* If TRUE then the keyhandler will be included in the "dump everything"
* keyhandler, so must not have any side-effects.
*/
bool_t diagnostic;
union {
keyhandler_fn_t *fn;
irq_keyhandler_fn_t *irq_fn;
} u;
/* The string is not copied by register_keyhandler(), so must persist. */
char *desc;
};
/* Initialize keytable with default handlers */
extern void initialize_keytable(void);
/*
* Register a callback handler for key @key. The keyhandler structure is not
* copied, so must persist.
*/
extern void register_keyhandler(unsigned char key, struct keyhandler *handler);
/* Inject a keypress into the key-handling subsystem. */
extern void handle_keypress(unsigned char key, struct cpu_user_regs *regs);
/* Scratch space is available for use of any keyhandler. */
extern char keyhandler_scratch[1024];
#endif /* __XEN_KEYHANDLER_H__ */
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