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/*
* Copyright (c) 2014, STMicroelectronics International N.V.
* Copyright (c) 2016, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef KERNEL_SPINLOCK_H
#define KERNEL_SPINLOCK_H
#define SPINLOCK_LOCK 1
#define SPINLOCK_UNLOCK 0
#ifndef ASM
#include <assert.h>
#include <compiler.h>
#include <stdbool.h>
#include <kernel/thread.h>
#ifdef CFG_TEE_CORE_DEBUG
void spinlock_count_incr(void);
void spinlock_count_decr(void);
bool have_spinlock(void);
static inline void assert_have_no_spinlock(void)
{
assert(!have_spinlock());
}
#else
static inline void spinlock_count_incr(void) { }
static inline void spinlock_count_decr(void) { }
static inline void assert_have_no_spinlock(void) { }
#endif
void __cpu_spin_lock(unsigned int *lock);
void __cpu_spin_unlock(unsigned int *lock);
/* returns 0 on locking success, non zero on failure */
unsigned int __cpu_spin_trylock(unsigned int *lock);
static inline void cpu_spin_lock(unsigned int *lock)
{
assert(thread_foreign_intr_disabled());
__cpu_spin_lock(lock);
spinlock_count_incr();
}
static inline bool cpu_spin_trylock(unsigned int *lock)
{
unsigned int rc;
assert(thread_foreign_intr_disabled());
rc = __cpu_spin_trylock(lock);
if (!rc)
spinlock_count_incr();
return !rc;
}
static inline void cpu_spin_unlock(unsigned int *lock)
{
assert(thread_foreign_intr_disabled());
__cpu_spin_unlock(lock);
spinlock_count_decr();
}
#endif /* ASM */
#endif /* KERNEL_SPINLOCK_H */
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