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https://github.com/xen-project/xen.git
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Keir Fraser
ce5c899f22
This makes stubdom use the host's gcc instead of downloading/compiling binutils+gcc. That requires a bunch of changes and even uncovered a few bugs, but saves a lot of time. Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/*
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* Done by Dietmar Hahn <dietmar.hahn@fujitsu-siemens.com
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* The file contains ia64 special spinlock stuff.
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*
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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
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell 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 THE
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* 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
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _ARCH_SPINLOCK_H_
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#define _ARCH_SPINLOCK_H_
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#include "atomic.h"
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#define ARCH_SPIN_LOCK_UNLOCKED { 0 }
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#define SPIN_LOCK_UNUSED 0
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#define SPIN_LOCK_USED 1
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static inline void
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_raw_spin_lock(spinlock_t* lck)
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{
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uint32_t ret;
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do {
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ret = ia64_cmpxchg_acq_32(&(lck->slock),
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SPIN_LOCK_UNUSED, SPIN_LOCK_USED);
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} while (ret == SPIN_LOCK_USED);
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}
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static inline void
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_raw_spin_unlock(spinlock_t *lck)
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{
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asm volatile ("st4.rel.nta [%0] = r0\n\t" :: "r"(&(lck->slock))
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: "memory" );
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}
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static inline uint32_t
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_raw_spin_trylock(spinlock_t* lck)
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{
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uint32_t ret;
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ret = ia64_cmpxchg_acq_32(&(lck->slock), SPIN_LOCK_USED, SPIN_LOCK_USED);
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return (ret == SPIN_LOCK_USED);
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}
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#endif /* _ARCH_SPINLOCK_H_ */
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