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Diffstat (limited to 'core/arch/arm/include/kernel/spinlock.h')
-rw-r--r-- | core/arch/arm/include/kernel/spinlock.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/core/arch/arm/include/kernel/spinlock.h b/core/arch/arm/include/kernel/spinlock.h new file mode 100644 index 0000000..c248673 --- /dev/null +++ b/core/arch/arm/include/kernel/spinlock.h @@ -0,0 +1,86 @@ +/* + * 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_irq_disabled()); + __cpu_spin_lock(lock); + spinlock_count_incr(); +} + +static inline bool cpu_spin_trylock(unsigned int *lock) +{ + unsigned int rc; + + assert(thread_irq_disabled()); + rc = __cpu_spin_trylock(lock); + if (!rc) + spinlock_count_incr(); + return !rc; +} + +static inline void cpu_spin_unlock(unsigned int *lock) +{ + assert(thread_irq_disabled()); + __cpu_spin_unlock(lock); + spinlock_count_decr(); +} +#endif /* ASM */ + +#endif /* KERNEL_SPINLOCK_H */ |