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