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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* -*- linux-c -*- |
| 2 | * |
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| 3 | * $Id: sysrq.h,v 1.1 2004-01-28 15:26:47 giacomo Exp $ |
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| 4 | * |
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| 5 | * Linux Magic System Request Key Hacks |
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| 6 | * |
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| 7 | * (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
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| 8 | * |
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| 9 | * (c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
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| 10 | * overhauled to use key registration |
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| 11 | * based upon discusions in irc://irc.openprojects.net/#kernelnewbies |
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| 12 | */ |
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| 13 | |||
| 14 | #include <linux/config.h> |
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| 15 | |||
| 16 | struct pt_regs; |
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| 17 | struct tty_struct; |
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| 18 | |||
| 19 | struct sysrq_key_op { |
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| 20 | void (*handler)(int, struct pt_regs *, struct tty_struct *); |
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| 21 | char *help_msg; |
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| 22 | char *action_msg; |
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| 23 | }; |
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| 24 | |||
| 25 | #ifdef CONFIG_MAGIC_SYSRQ |
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| 26 | |||
| 27 | /* Generic SysRq interface -- you may call it from any device driver, supplying |
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| 28 | * ASCII code of the key, pointer to registers and kbd/tty structs (if they |
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| 29 | * are available -- else NULL's). |
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| 30 | */ |
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| 31 | |||
| 32 | void handle_sysrq(int, struct pt_regs *, struct tty_struct *); |
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| 33 | |||
| 34 | /* |
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| 35 | * Nonlocking version of handle sysrq, used by sysrq handlers that need to |
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| 36 | * call sysrq handlers |
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| 37 | */ |
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| 38 | |||
| 39 | void __handle_sysrq_nolock(int, struct pt_regs *, struct tty_struct *); |
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| 40 | |||
| 41 | /* |
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| 42 | * Sysrq registration manipulation functions |
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| 43 | */ |
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| 44 | |||
| 45 | void __sysrq_lock_table (void); |
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| 46 | void __sysrq_unlock_table (void); |
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| 47 | struct sysrq_key_op *__sysrq_get_key_op (int key); |
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| 48 | void __sysrq_put_key_op (int key, struct sysrq_key_op *op_p); |
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| 49 | |||
| 50 | extern __inline__ int |
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| 51 | __sysrq_swap_key_ops_nolock(int key, struct sysrq_key_op *insert_op_p, |
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| 52 | struct sysrq_key_op *remove_op_p) |
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| 53 | { |
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| 54 | int retval; |
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| 55 | if (__sysrq_get_key_op(key) == remove_op_p) { |
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| 56 | __sysrq_put_key_op(key, insert_op_p); |
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| 57 | retval = 0; |
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| 58 | } else { |
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| 59 | retval = -1; |
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| 60 | } |
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| 61 | return retval; |
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| 62 | } |
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| 63 | |||
| 64 | extern __inline__ int |
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| 65 | __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p, |
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| 66 | struct sysrq_key_op *remove_op_p) { |
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| 67 | int retval; |
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| 68 | __sysrq_lock_table(); |
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| 69 | retval = __sysrq_swap_key_ops_nolock(key, insert_op_p, remove_op_p); |
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| 70 | __sysrq_unlock_table(); |
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| 71 | return retval; |
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| 72 | } |
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| 73 | |||
| 74 | static inline int register_sysrq_key(int key, struct sysrq_key_op *op_p) |
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| 75 | { |
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| 76 | return __sysrq_swap_key_ops(key, op_p, NULL); |
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| 77 | } |
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| 78 | |||
| 79 | static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op_p) |
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| 80 | { |
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| 81 | return __sysrq_swap_key_ops(key, NULL, op_p); |
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| 82 | } |
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| 83 | |||
| 84 | #else |
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| 85 | |||
| 86 | static inline int __reterr(void) |
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| 87 | { |
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| 88 | return -EINVAL; |
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| 89 | } |
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| 90 | |||
| 91 | #define register_sysrq_key(ig,nore) __reterr() |
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| 92 | #define unregister_sysrq_key(ig,nore) __reterr() |
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| 93 | |||
| 94 | #endif |