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