arm: Add initial memory barrier functions
* These likely need reviewed by someone better at arm assembly. (#10537)
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/*
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* Copyright 2014, Paweł Dziepak, pdziepak@quarnos.org.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Alexander von Gluck IV <kallisti5@unixzen.com>
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*/
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#ifndef _KERNEL_ARCH_ARM_ATOMIC_H
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#define _KERNEL_ARCH_ARM_ATOMIC_H
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static inline void
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memory_read_barrier_inline(void)
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{
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// TODO Only ArmV7+?
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asm volatile("dsb sy" : : : "memory");
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}
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static inline void
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memory_write_barrier_inline(void)
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{
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// TODO Only ArmV7+?
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asm volatile("dsb sy" : : : "memory");
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}
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static inline void
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memory_full_barrier_inline(void)
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{
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// TODO Only ArmV7+?
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asm volatile("dsb sy" : : : "memory");
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}
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#define memory_read_barrier memory_read_barrier_inline
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#define memory_write_barrier memory_write_barrier_inline
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#define memory_full_barrier memory_full_barrier_inline
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static inline void
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atomic_set_inline(int32* value, int32 newValue)
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{
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memory_write_barrier();
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*(volatile int32*)value = newValue;
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}
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static inline int32
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atomic_get_and_set_inline(int32* value, int32 newValue)
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{
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// BIG TODO: ARM Atomic get and set
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// asm volatile("xchgl %0, (%1)"
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// : "+r" (newValue)
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// : "r" (value)
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// : "memory");
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return newValue;
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}
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static inline int32
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atomic_test_and_set_inline(int32* value, int32 newValue, int32 testAgainst)
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{
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// BIG TODO: ARM Atomic test and set inline
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// asm volatile("lock; cmpxchgl %2, (%3)"
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// : "=a" (newValue)
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// : "0" (testAgainst), "r" (newValue), "r" (value)
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// : "memory");
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return newValue;
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}
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static inline int32
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atomic_add_inline(int32* value, int32 newValue)
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{
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// BIG TODO: ARM Atomic add inline
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// asm volatile("lock; xaddl %0, (%1)"
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// : "+r" (newValue)
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// : "r" (value)
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// : "memory");
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return newValue;
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}
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static inline int32
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atomic_get_inline(int32* value)
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{
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int32 newValue = *(volatile int32*)value;
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memory_read_barrier();
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return newValue;
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}
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#define atomic_set atomic_set_inline
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#define atomic_get_and_set atomic_get_and_set_inline
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#ifndef atomic_test_and_set
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# define atomic_test_and_set atomic_test_and_set_inline
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#endif
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#ifndef atomic_add
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# define atomic_add atomic_add_inline
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#endif
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#define atomic_get atomic_get_inline
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#endif // _KERNEL_ARCH_ARM_ATOMIC_H
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