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| Rev | Author | Line No. | Line |
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| 422 | giacomo | 1 | #ifndef _LINUX_MODULE_PARAMS_H |
| 2 | #define _LINUX_MODULE_PARAMS_H |
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| 3 | /* (C) Copyright 2001, 2002 Rusty Russell IBM Corporation */ |
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| 4 | #include <linux/init.h> |
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| 5 | #include <linux/stringify.h> |
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| 6 | #include <linux/kernel.h> |
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| 7 | |||
| 8 | /* You can override this manually, but generally this should match the |
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| 9 | module name. */ |
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| 10 | #ifdef MODULE |
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| 11 | #define MODULE_PARAM_PREFIX /* empty */ |
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| 12 | #else |
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| 13 | #define MODULE_PARAM_PREFIX __stringify(KBUILD_MODNAME) "." |
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| 14 | #endif |
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| 15 | |||
| 16 | struct kernel_param; |
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| 17 | |||
| 18 | /* Returns 0, or -errno. arg is in kp->arg. */ |
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| 19 | typedef int (*param_set_fn)(const char *val, struct kernel_param *kp); |
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| 20 | /* Returns length written or -errno. Buffer is 4k (ie. be short!) */ |
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| 21 | typedef int (*param_get_fn)(char *buffer, struct kernel_param *kp); |
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| 22 | |||
| 23 | struct kernel_param { |
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| 24 | const char *name; |
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| 25 | unsigned int perm; |
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| 26 | param_set_fn set; |
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| 27 | param_get_fn get; |
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| 28 | void *arg; |
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| 29 | }; |
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| 30 | |||
| 31 | /* Special one for strings we want to copy into */ |
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| 32 | struct kparam_string { |
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| 33 | unsigned int maxlen; |
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| 34 | char *string; |
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| 35 | }; |
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| 36 | |||
| 37 | /* Special one for arrays */ |
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| 38 | struct kparam_array |
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| 39 | { |
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| 40 | unsigned int max; |
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| 41 | unsigned int *num; |
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| 42 | param_set_fn set; |
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| 43 | param_get_fn get; |
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| 44 | unsigned int elemsize; |
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| 45 | void *elem; |
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| 46 | }; |
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| 47 | |||
| 48 | /* This is the fundamental function for registering boot/module |
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| 49 | parameters. perm sets the visibility in driverfs: 000 means it's |
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| 50 | not there, read bits mean it's readable, write bits mean it's |
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| 51 | writable. */ |
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| 52 | #define __module_param_call(prefix, name, set, get, arg, perm) \ |
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| 53 | static char __param_str_##name[] __initdata = prefix #name; \ |
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| 54 | static struct kernel_param const __param_##name \ |
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| 55 | __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \ |
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| 56 | = { __param_str_##name, perm, set, get, arg } |
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| 57 | |||
| 58 | #define module_param_call(name, set, get, arg, perm) \ |
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| 59 | __module_param_call(MODULE_PARAM_PREFIX, name, set, get, arg, perm) |
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| 60 | |||
| 61 | /* Helper functions: type is byte, short, ushort, int, uint, long, |
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| 62 | ulong, charp, bool or invbool, or XXX if you define param_get_XXX, |
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| 63 | param_set_XXX and param_check_XXX. */ |
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| 64 | #define module_param_named(name, value, type, perm) \ |
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| 65 | param_check_##type(name, &(value)); \ |
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| 66 | module_param_call(name, param_set_##type, param_get_##type, &value, perm) |
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| 67 | |||
| 68 | #define module_param(name, type, perm) \ |
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| 69 | module_param_named(name, name, type, perm) |
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| 70 | |||
| 71 | /* Actually copy string: maxlen param is usually sizeof(string). */ |
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| 72 | #define module_param_string(name, string, len, perm) \ |
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| 73 | static struct kparam_string __param_string_##name __initdata \ |
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| 74 | = { len, string }; \ |
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| 75 | module_param_call(name, param_set_copystring, param_get_charp, \ |
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| 76 | &__param_string_##name, perm) |
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| 77 | |||
| 78 | /* Called on module insert or kernel boot */ |
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| 79 | extern int parse_args(const char *name, |
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| 80 | char *args, |
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| 81 | struct kernel_param *params, |
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| 82 | unsigned num, |
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| 83 | int (*unknown)(char *param, char *val)); |
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| 84 | |||
| 85 | /* All the helper functions */ |
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| 86 | /* The macros to do compile-time type checking stolen from Jakub |
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| 87 | Jelinek, who IIRC came up with this idea for the 2.4 module init code. */ |
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| 88 | #define __param_check(name, p, type) \ |
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| 89 | static inline type *__check_##name(void) { return(p); } |
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| 90 | |||
| 91 | extern int param_set_short(const char *val, struct kernel_param *kp); |
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| 92 | extern int param_get_short(char *buffer, struct kernel_param *kp); |
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| 93 | #define param_check_short(name, p) __param_check(name, p, short) |
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| 94 | |||
| 95 | extern int param_set_ushort(const char *val, struct kernel_param *kp); |
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| 96 | extern int param_get_ushort(char *buffer, struct kernel_param *kp); |
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| 97 | #define param_check_ushort(name, p) __param_check(name, p, unsigned short) |
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| 98 | |||
| 99 | extern int param_set_int(const char *val, struct kernel_param *kp); |
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| 100 | extern int param_get_int(char *buffer, struct kernel_param *kp); |
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| 101 | #define param_check_int(name, p) __param_check(name, p, int) |
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| 102 | |||
| 103 | extern int param_set_uint(const char *val, struct kernel_param *kp); |
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| 104 | extern int param_get_uint(char *buffer, struct kernel_param *kp); |
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| 105 | #define param_check_uint(name, p) __param_check(name, p, unsigned int) |
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| 106 | |||
| 107 | extern int param_set_long(const char *val, struct kernel_param *kp); |
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| 108 | extern int param_get_long(char *buffer, struct kernel_param *kp); |
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| 109 | #define param_check_long(name, p) __param_check(name, p, long) |
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| 110 | |||
| 111 | extern int param_set_ulong(const char *val, struct kernel_param *kp); |
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| 112 | extern int param_get_ulong(char *buffer, struct kernel_param *kp); |
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| 113 | #define param_check_ulong(name, p) __param_check(name, p, unsigned long) |
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| 114 | |||
| 115 | extern int param_set_charp(const char *val, struct kernel_param *kp); |
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| 116 | extern int param_get_charp(char *buffer, struct kernel_param *kp); |
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| 117 | #define param_check_charp(name, p) __param_check(name, p, char *) |
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| 118 | |||
| 119 | extern int param_set_bool(const char *val, struct kernel_param *kp); |
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| 120 | extern int param_get_bool(char *buffer, struct kernel_param *kp); |
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| 121 | #define param_check_bool(name, p) __param_check(name, p, int) |
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| 122 | |||
| 123 | extern int param_set_invbool(const char *val, struct kernel_param *kp); |
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| 124 | extern int param_get_invbool(char *buffer, struct kernel_param *kp); |
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| 125 | #define param_check_invbool(name, p) __param_check(name, p, int) |
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| 126 | |||
| 127 | /* Comma-separated array: num is set to number they actually specified. */ |
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| 128 | #define module_param_array(name, type, num, perm) \ |
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| 129 | static struct kparam_array __param_arr_##name \ |
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| 130 | = { ARRAY_SIZE(name), &num, param_set_##type, param_get_##type, \ |
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| 131 | sizeof(name[0]), name }; \ |
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| 132 | module_param_call(name, param_array_set, param_array_get, \ |
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| 133 | &__param_arr_##name, perm) |
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| 134 | |||
| 135 | extern int param_array_set(const char *val, struct kernel_param *kp); |
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| 136 | extern int param_array_get(char *buffer, struct kernel_param *kp); |
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| 137 | |||
| 138 | extern int param_set_copystring(const char *val, struct kernel_param *kp); |
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| 139 | |||
| 140 | int param_array(const char *name, |
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| 141 | const char *val, |
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| 142 | unsigned int min, unsigned int max, |
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| 143 | void *elem, int elemsize, |
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| 144 | int (*set)(const char *, struct kernel_param *kp), |
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| 145 | int *num); |
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| 146 | #endif /* _LINUX_MODULE_PARAM_TYPES_H */ |