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/*
* Done by Dietmar Hahn <dietmar.hahn@fujitsu-siemens.com
* The file contains ia64 special spinlock stuff.
*
****************************************************************************
* 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 _ARCH_SPINLOCK_H_
#define _ARCH_SPINLOCK_H_
#include "atomic.h"
#define ARCH_SPIN_LOCK_UNLOCKED { 0 }
#define SPIN_LOCK_UNUSED 0
#define SPIN_LOCK_USED 1
static inline void
_raw_spin_lock(spinlock_t* lck)
{
uint32_t ret;
do {
ret = ia64_cmpxchg_acq_32(&(lck->slock),
SPIN_LOCK_UNUSED, SPIN_LOCK_USED);
} while (ret == SPIN_LOCK_USED);
}
static inline void
_raw_spin_unlock(spinlock_t *lck)
{
asm volatile ("st4.rel.nta [%0] = r0\n\t" :: "r"(&(lck->slock))
: "memory" );
}
static inline uint32_t
_raw_spin_trylock(spinlock_t* lck)
{
uint32_t ret;
ret = ia64_cmpxchg_acq_32(&(lck->slock), SPIN_LOCK_USED, SPIN_LOCK_USED);
return (ret == SPIN_LOCK_USED);
}
#endif /* _ARCH_SPINLOCK_H_ */
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