projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 6006c0d8 JH |
2 | #ifndef __ASM_METAG_CMPXCHG_LOCK1_H |
| 3 | #define __ASM_METAG_CMPXCHG_LOCK1_H | |
| 4 | ||
| 5 | #include <asm/global_lock.h> | |
| 6 | ||
| 7 | /* Use LOCK2 as these have to be atomic w.r.t. ordinary accesses. */ | |
| 8 | ||
| 9 | static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val) | |
| 10 | { | |
| 11 | unsigned long flags, retval; | |
| 12 | ||
| 13 | __global_lock2(flags); | |
| 14 | fence(); | |
| 15 | retval = *m; | |
| 16 | *m = val; | |
| 17 | __global_unlock2(flags); | |
| 18 | return retval; | |
| 19 | } | |
| 20 | ||
| 21 | static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val) | |
| 22 | { | |
| 23 | unsigned long flags, retval; | |
| 24 | ||
| 25 | __global_lock2(flags); | |
| 26 | fence(); | |
| 27 | retval = *m; | |
| 28 | *m = val & 0xff; | |
| 29 | __global_unlock2(flags); | |
| 30 | return retval; | |
| 31 | } | |
| 32 | ||
| 33 | static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old, | |
| 34 | unsigned long new) | |
| 35 | { | |
| 36 | __u32 retval; | |
| 37 | unsigned long flags; | |
| 38 | ||
| 39 | __global_lock2(flags); | |
| 40 | retval = *m; | |
| 41 | if (retval == old) { | |
| 42 | fence(); | |
| 43 | *m = new; | |
| 44 | } | |
| 45 | __global_unlock2(flags); | |
| 46 | return retval; | |
| 47 | } | |
| 48 | ||
| 49 | #endif /* __ASM_METAG_CMPXCHG_LOCK1_H */ |