| 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 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 |
| 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 |