70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
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/*
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* Copyright (c) 2011 Aeroflex Gaisler
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*
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* BSD license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef _INCLUDE_LEONSPINLOCK_h
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#define _INCLUDE_LEONSPINLOCK_h
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typedef struct
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{
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unsigned char lock;
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} raw_spinlock_t;
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#define __RAW_SPIN_LOCK_UNLOCKED { 0 }
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typedef struct
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{
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volatile unsigned int lock;
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} raw_rwlock_t;
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#define __RAW_RW_LOCK_UNLOCKED { 0 }
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static inline void
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__raw_spin_lock (raw_spinlock_t * lock)
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{
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__asm__ __volatile__ ("\n1:\n\t" "ldstuba [%0]1, %%g2\n\t" /* ASI_LEON23_DCACHE_MISS */
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"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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:"r" (lock):"g2", "memory", "cc");
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}
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static inline int
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__raw_spin_trylock (raw_spinlock_t * lock)
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{
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unsigned int result;
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__asm__ __volatile__ ("ldstuba [%1]1, %0" /* ASI_LEON23_DCACHE_MISS */
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:"=r" (result):"r" (lock):"memory");
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return (result == 0);
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}
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static inline void
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__raw_spin_unlock (raw_spinlock_t * lock)
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{
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__asm__ __volatile__ ("stb %%g0, [%0]"::"r" (lock):"memory");
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}
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#endif /* _INCLUDE_LEONSPINLOCK_h */
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/* end of include file */
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