| 1 | /* |
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| 2 | * Done by Dietmar Hahn <dietmar.hahn@fujitsu-siemens.com |
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| 3 | * The file contains ia64 special spinlock stuff. |
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| 4 | * |
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| 5 | **************************************************************************** |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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| 7 | * of this software and associated documentation files (the "Software"), to |
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| 8 | * deal in the Software without restriction, including without limitation the |
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| 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
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| 10 | * sell copies of the Software, and to permit persons to whom the Software is |
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| 11 | * furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included in |
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| 14 | * all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 21 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 22 | * DEALINGS IN THE SOFTWARE. |
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| 23 | */ |
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| 24 | |
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| 25 | #ifndef _ARCH_SPINLOCK_H_ |
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| 26 | #define _ARCH_SPINLOCK_H_ |
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| 27 | |
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| 28 | #include "atomic.h" |
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| 29 | |
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| 30 | #define ARCH_SPIN_LOCK_UNLOCKED (spinlock_t) { 0 } |
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| 31 | |
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| 32 | #define SPIN_LOCK_UNUSED 0 |
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| 33 | #define SPIN_LOCK_USED 1 |
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| 34 | |
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| 35 | |
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| 36 | static inline void |
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| 37 | _raw_spin_lock(spinlock_t* lck) |
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| 38 | { |
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| 39 | uint32_t ret; |
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| 40 | do { |
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| 41 | ret = ia64_cmpxchg_acq_32(&(lck->slock), |
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| 42 | SPIN_LOCK_UNUSED, SPIN_LOCK_USED); |
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| 43 | } while (ret == SPIN_LOCK_USED); |
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| 44 | } |
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| 45 | |
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| 46 | static inline void |
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| 47 | _raw_spin_unlock(spinlock_t *lck) |
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| 48 | { |
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| 49 | asm volatile ("st4.rel.nta [%0] = r0\n\t" :: "r"(&(lck->slock)) |
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| 50 | : "memory" ); |
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| 51 | } |
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| 52 | |
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| 53 | static inline uint32_t |
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| 54 | _raw_spin_trylock(spinlock_t* lck) |
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| 55 | { |
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| 56 | uint32_t ret; |
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| 57 | ret = ia64_cmpxchg_acq_32(&(lck->slock), SPIN_LOCK_USED, SPIN_LOCK_USED); |
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| 58 | return (ret == SPIN_LOCK_USED); |
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| 59 | } |
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| 60 | |
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| 61 | #endif /* _ARCH_SPINLOCK_H_ */ |
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