[444] | 1 | /* |
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| 2 | * Copyright (c) 2011 Aeroflex Gaisler |
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| 3 | * |
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| 4 | * BSD license: |
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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 deal |
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| 8 | * in the Software without restriction, including without limitation the rights |
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| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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| 10 | * 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 |
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| 19 | * THE 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 FROM, |
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| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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| 22 | * THE SOFTWARE. |
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| 23 | */ |
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| 24 | |
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| 25 | |
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| 26 | #ifndef _INCLUDE_LEONSPINLOCK_h |
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| 27 | #define _INCLUDE_LEONSPINLOCK_h |
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| 28 | |
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| 29 | typedef struct |
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| 30 | { |
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| 31 | unsigned char lock; |
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| 32 | } raw_spinlock_t; |
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| 33 | |
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| 34 | #define __RAW_SPIN_LOCK_UNLOCKED { 0 } |
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| 35 | |
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| 36 | typedef struct |
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| 37 | { |
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| 38 | volatile unsigned int lock; |
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| 39 | } raw_rwlock_t; |
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| 40 | |
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| 41 | #define __RAW_RW_LOCK_UNLOCKED { 0 } |
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| 42 | |
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| 43 | static inline void |
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| 44 | __raw_spin_lock (raw_spinlock_t * lock) |
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| 45 | { |
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| 46 | __asm__ __volatile__ ("\n1:\n\t" "ldstuba [%0]1, %%g2\n\t" /* ASI_LEON23_DCACHE_MISS */ |
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| 47 | "orcc %%g2, 0x0, %%g0\n\t" "bne,a 2f\n\t" " ldub [%0], %%g2\n\t" ".subsection 2\n" "2:\n\t" "orcc %%g2, 0x0, %%g0\n\t" "bne,a 2b\n\t" " ldub [%0], %%g2\n\t" "b,a 1b\n\t" ".previous\n": /* no outputs */ |
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| 48 | :"r" (lock):"g2", "memory", "cc"); |
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| 49 | } |
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| 50 | |
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| 51 | static inline int |
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| 52 | __raw_spin_trylock (raw_spinlock_t * lock) |
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| 53 | { |
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| 54 | unsigned int result; |
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| 55 | __asm__ __volatile__ ("ldstuba [%1]1, %0" /* ASI_LEON23_DCACHE_MISS */ |
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| 56 | :"=r" (result):"r" (lock):"memory"); |
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| 57 | return (result == 0); |
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| 58 | } |
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| 59 | |
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| 60 | static inline void |
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| 61 | __raw_spin_unlock (raw_spinlock_t * lock) |
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| 62 | { |
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| 63 | __asm__ __volatile__ ("stb %%g0, [%0]"::"r" (lock):"memory"); |
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| 64 | } |
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| 65 | |
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| 66 | |
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| 67 | |
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| 68 | #endif /* _INCLUDE_LEONSPINLOCK_h */ |
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| 69 | /* end of include file */ |
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