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 #include <linux/config.h> 15 16 struct pt_regs; 17 struct tty_struct; 18 19 /* Possible values of bitmask for enabling sysrq functions */ 20 /* 0x0001 is reserved for enable everything */ 21 #define SYSRQ_ENABLE_LOG 0x0002 22 #define SYSRQ_ENABLE_KEYBOARD 0x0004 23 #define SYSRQ_ENABLE_DUMP 0x0008 24 #define SYSRQ_ENABLE_SYNC 0x0010 25 #define SYSRQ_ENABLE_REMOUNT 0x0020 26 #define SYSRQ_ENABLE_SIGNAL 0x0040 27 #define SYSRQ_ENABLE_BOOT 0x0080 28 #define SYSRQ_ENABLE_RTNICE 0x0100 29 30 struct sysrq_key_op { 31 void (*handler)(int, struct pt_regs *, struct tty_struct *); 32 char *help_msg; 33 char *action_msg; 34 int enable_mask; 35 }; 36 37 #ifdef CONFIG_MAGIC_SYSRQ 38 39 /* Generic SysRq interface -- you may call it from any device driver, supplying 40 * ASCII code of the key, pointer to registers and kbd/tty structs (if they 41 * are available -- else NULL's). 42 */ 43 44 void handle_sysrq(int, struct pt_regs *, struct tty_struct *); 45 void __handle_sysrq(int, struct pt_regs *, struct tty_struct *, int check_mask); 46 int register_sysrq_key(int, struct sysrq_key_op *); 47 int unregister_sysrq_key(int, struct sysrq_key_op *); 48 struct sysrq_key_op *__sysrq_get_key_op(int key); 49 50 #else 51 52 static inline int __reterr(void) 53 { 54 return -EINVAL; 55 } 56 57 #define register_sysrq_key(ig,nore) __reterr() 58 #define unregister_sysrq_key(ig,nore) __reterr() 59 60 #endif 61