projects / lttng-ust.git / blame
| Commit | Line | Data |
|---|---|---|
| a72ca31a PMF |
1 | #ifndef _LINUX_IMMEDIATE_H |
| 2 | #define _LINUX_IMMEDIATE_H | |
| 3 | ||
| 4 | /* | |
| 5 | * Immediate values, can be updated at runtime and save cache lines. | |
| 6 | * | |
| 7 | * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
| 8 | * | |
| 9 | * This file is released under the GPLv2. | |
| 10 | * See the file COPYING for more details. | |
| 11 | */ | |
| 12 | ||
| 13 | #ifdef USE_IMMEDIATE | |
| 14 | ||
| 15 | #include <asm/immediate.h> | |
| 16 | ||
| 17 | /** | |
| 18 | * imv_set - set immediate variable (with locking) | |
| 19 | * @name: immediate value name | |
| 20 | * @i: required value | |
| 21 | * | |
| 22 | * Sets the value of @name, taking the module_mutex if required by | |
| 23 | * the architecture. | |
| 24 | */ | |
| 25 | #define imv_set(name, i) \ | |
| 26 | do { \ | |
| 27 | name##__imv = (i); \ | |
| 28 | core_imv_update(); \ | |
| 29 | module_imv_update(); \ | |
| 30 | } while (0) | |
| 31 | ||
| 32 | /* | |
| 33 | * Internal update functions. | |
| 34 | */ | |
| 35 | extern void core_imv_update(void); | |
| 36 | extern void imv_update_range(const struct __imv *begin, | |
| 37 | const struct __imv *end); | |
| 38 | extern void imv_unref_core_init(void); | |
| 39 | extern void imv_unref(struct __imv *begin, struct __imv *end, void *start, | |
| 40 | unsigned long size); | |
| 41 | ||
| 42 | #else | |
| 43 | ||
| 44 | /* | |
| 45 | * Generic immediate values: a simple, standard, memory load. | |
| 46 | */ | |
| 47 | ||
| 48 | /** | |
| 49 | * imv_read - read immediate variable | |
| 50 | * @name: immediate value name | |
| 51 | * | |
| 52 | * Reads the value of @name. | |
| 53 | */ | |
| 54 | #define imv_read(name) _imv_read(name) | |
| 55 | ||
| 56 | /** | |
| 57 | * imv_set - set immediate variable (with locking) | |
| 58 | * @name: immediate value name | |
| 59 | * @i: required value | |
| 60 | * | |
| 61 | * Sets the value of @name, taking the module_mutex if required by | |
| 62 | * the architecture. | |
| 63 | */ | |
| 64 | #define imv_set(name, i) (name##__imv = (i)) | |
| 65 | ||
| 66 | static inline void core_imv_update(void) { } | |
| 67 | static inline void imv_unref_core_init(void) { } | |
| 68 | ||
| 69 | #endif | |
| 70 | ||
| 71 | #define DECLARE_IMV(type, name) extern __typeof__(type) name##__imv | |
| 72 | #define DEFINE_IMV(type, name) __typeof__(type) name##__imv | |
| 73 | ||
| 74 | #define EXPORT_IMV_SYMBOL(name) EXPORT_SYMBOL(name##__imv) | |
| 75 | #define EXPORT_IMV_SYMBOL_GPL(name) EXPORT_SYMBOL_GPL(name##__imv) | |
| 76 | ||
| 77 | /** | |
| 78 | * _imv_read - Read immediate value with standard memory load. | |
| 79 | * @name: immediate value name | |
| 80 | * | |
| 81 | * Force a data read of the immediate value instead of the immediate value | |
| 82 | * based mechanism. Useful for __init and __exit section data read. | |
| 83 | */ | |
| 84 | #define _imv_read(name) (name##__imv) | |
| 85 | ||
| 86 | #endif |