projects / lttng-ust.git / blame
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| 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 | * | |
| 22cb38fb PMF |
9 | * This library is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public | |
| 11 | * License as published by the Free Software Foundation; either | |
| 12 | * version 2.1 of the License, or (at your option) any later version. | |
| 13 | * | |
| 14 | * This library is distributed in the hope that it will be useful, | |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 17 | * Lesser General Public License for more details. | |
| 18 | * | |
| 19 | * You should have received a copy of the GNU Lesser General Public | |
| 20 | * License along with this library; if not, write to the Free Software | |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| a72ca31a PMF |
22 | */ |
| 23 | ||
| 24 | #ifdef USE_IMMEDIATE | |
| 25 | ||
| 26 | #include <asm/immediate.h> | |
| 27 | ||
| 28 | /** | |
| 29 | * imv_set - set immediate variable (with locking) | |
| 30 | * @name: immediate value name | |
| 31 | * @i: required value | |
| 32 | * | |
| 33 | * Sets the value of @name, taking the module_mutex if required by | |
| 34 | * the architecture. | |
| 35 | */ | |
| 36 | #define imv_set(name, i) \ | |
| 37 | do { \ | |
| 38 | name##__imv = (i); \ | |
| 39 | core_imv_update(); \ | |
| 40 | module_imv_update(); \ | |
| 41 | } while (0) | |
| 42 | ||
| 43 | /* | |
| 44 | * Internal update functions. | |
| 45 | */ | |
| 46 | extern void core_imv_update(void); | |
| 47 | extern void imv_update_range(const struct __imv *begin, | |
| 48 | const struct __imv *end); | |
| 49 | extern void imv_unref_core_init(void); | |
| 50 | extern void imv_unref(struct __imv *begin, struct __imv *end, void *start, | |
| 51 | unsigned long size); | |
| 52 | ||
| 53 | #else | |
| 54 | ||
| 55 | /* | |
| 56 | * Generic immediate values: a simple, standard, memory load. | |
| 57 | */ | |
| 58 | ||
| 59 | /** | |
| 60 | * imv_read - read immediate variable | |
| 61 | * @name: immediate value name | |
| 62 | * | |
| 63 | * Reads the value of @name. | |
| 64 | */ | |
| 65 | #define imv_read(name) _imv_read(name) | |
| 66 | ||
| 67 | /** | |
| 68 | * imv_set - set immediate variable (with locking) | |
| 69 | * @name: immediate value name | |
| 70 | * @i: required value | |
| 71 | * | |
| 72 | * Sets the value of @name, taking the module_mutex if required by | |
| 73 | * the architecture. | |
| 74 | */ | |
| 75 | #define imv_set(name, i) (name##__imv = (i)) | |
| 76 | ||
| 77 | static inline void core_imv_update(void) { } | |
| 78 | static inline void imv_unref_core_init(void) { } | |
| 79 | ||
| 80 | #endif | |
| 81 | ||
| 82 | #define DECLARE_IMV(type, name) extern __typeof__(type) name##__imv | |
| 83 | #define DEFINE_IMV(type, name) __typeof__(type) name##__imv | |
| 84 | ||
| 85 | #define EXPORT_IMV_SYMBOL(name) EXPORT_SYMBOL(name##__imv) | |
| 86 | #define EXPORT_IMV_SYMBOL_GPL(name) EXPORT_SYMBOL_GPL(name##__imv) | |
| 87 | ||
| 88 | /** | |
| 89 | * _imv_read - Read immediate value with standard memory load. | |
| 90 | * @name: immediate value name | |
| 91 | * | |
| 92 | * Force a data read of the immediate value instead of the immediate value | |
| 93 | * based mechanism. Useful for __init and __exit section data read. | |
| 94 | */ | |
| 95 | #define _imv_read(name) (name##__imv) | |
| 96 | ||
| 97 | #endif |