1 /* -*- linux-c -*- 2 * 3 * $Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj Exp $ 4 * 5 * Linux Magic System Request Key Hacks 6 * 7 * (c) 1997 Martin Mares <[email protected]> 8 * 9 * (c) 2000 Crutcher Dunnavant <[email protected]> 10 * overhauled to use key registration 11 * based upon discusions in irc://irc.openprojects.net/#kernelnewbies 12 */ 13 14 15 struct pt_regs; 16 struct tty_struct; 17 18 /* Possible values of bitmask for enabling sysrq functions */ 19 /* 0x0001 is reserved for enable everything */ 20 #define SYSRQ_ENABLE_LOG 0x0002 21 #define SYSRQ_ENABLE_KEYBOARD 0x0004 22 #define SYSRQ_ENABLE_DUMP 0x0008 23 #define SYSRQ_ENABLE_SYNC 0x0010 24 #define SYSRQ_ENABLE_REMOUNT 0x0020 25 #define SYSRQ_ENABLE_SIGNAL 0x0040 26 #define SYSRQ_ENABLE_BOOT 0x0080 27 #define SYSRQ_ENABLE_RTNICE 0x0100 28 29 struct sysrq_key_op { 30 void (*handler)(int, struct pt_regs *, struct tty_struct *); 31 char *help_msg; 32 char *action_msg; 33 int enable_mask; 34 }; 35 36 #ifdef CONFIG_MAGIC_SYSRQ 37 38 /* Generic SysRq interface -- you may call it from any device driver, supplying 39 * ASCII code of the key, pointer to registers and kbd/tty structs (if they 40 * are available -- else NULL's). 41 */ 42 43 void handle_sysrq(int, struct pt_regs *, struct tty_struct *); 44 void __handle_sysrq(int, struct pt_regs *, struct tty_struct *, int check_mask); 45 int register_sysrq_key(int, struct sysrq_key_op *); 46 int unregister_sysrq_key(int, struct sysrq_key_op *); 47 struct sysrq_key_op *__sysrq_get_key_op(int key); 48 49 #else 50 51 static inline int __reterr(void) 52 { 53 return -EINVAL; 54 } 55 56 #define register_sysrq_key(ig,nore) __reterr() 57 #define unregister_sysrq_key(ig,nore) __reterr() 58 59 #endif 60