3 * $Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj Exp $
5 * Linux Magic System Request Key Hacks
7 * (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
9 * (c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
10 * overhauled to use key registration
11 * based upon discusions in irc://irc.openprojects.net/#kernelnewbies
14 #include <linux/config.h>
20 void (*handler)(int, struct pt_regs *, struct tty_struct *);
25 #ifdef CONFIG_MAGIC_SYSRQ
27 /* Generic SysRq interface -- you may call it from any device driver, supplying
28 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
29 * are available -- else NULL's).
32 void handle_sysrq(int, struct pt_regs *, struct tty_struct *);
35 * Nonlocking version of handle sysrq, used by sysrq handlers that need to
39 void __handle_sysrq_nolock(int, struct pt_regs *, struct tty_struct *);
42 * Sysrq registration manipulation functions
45 void __sysrq_lock_table (void);
46 void __sysrq_unlock_table (void);
47 struct sysrq_key_op *__sysrq_get_key_op (int key);
48 void __sysrq_put_key_op (int key, struct sysrq_key_op *op_p);
51 __sysrq_swap_key_ops_nolock(int key, struct sysrq_key_op *insert_op_p,
52 struct sysrq_key_op *remove_op_p)
55 if (__sysrq_get_key_op(key) == remove_op_p) {
56 __sysrq_put_key_op(key, insert_op_p);
65 __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
66 struct sysrq_key_op *remove_op_p) {
69 retval = __sysrq_swap_key_ops_nolock(key, insert_op_p, remove_op_p);
70 __sysrq_unlock_table();
74 static inline int register_sysrq_key(int key, struct sysrq_key_op *op_p)
76 return __sysrq_swap_key_ops(key, op_p, NULL);
79 static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
81 return __sysrq_swap_key_ops(key, NULL, op_p);
86 static inline int __reterr(void)
91 #define register_sysrq_key(ig,nore) __reterr()
92 #define unregister_sysrq_key(ig,nore) __reterr()