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AArch64: support hardware atomic

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Support aarch64 rt_hw_atomic_* api.
Add atomic implemente by rt_atomic api:
    rt_atomic_dec_and_test
    rt_atomic_fetch_add_unless
    rt_atomic_add_unless
    rt_atomic_inc_not_zero

Signed-off-by: GuEe-GUI <GuEe-GUI@github.com>
This commit is contained in:
wusongjie
2023-07-05 13:38:29 +08:00
parent 179157f4e1
commit 3b7e46de7e
2 changed files with 139 additions and 0 deletions
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31
include/rtatomic.h
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@@ -11,6 +11,8 @@
#ifndef __RT_ATOMIC_H__
#define __RT_ATOMIC_H__
#include <rthw.h>
#if !defined(__cplusplus)
rt_atomic_t rt_hw_atomic_load(volatile rt_atomic_t *ptr);
@@ -206,6 +208,35 @@ rt_inline rt_atomic_t rt_soft_atomic_compare_exchange_strong(volatile rt_atomic_
}
#endif /* RT_USING_STDC_ATOMIC */
rt_inline rt_bool_t rt_atomic_dec_and_test(volatile rt_atomic_t *ptr)
{
return rt_atomic_sub(ptr, 1) == 0;
}
rt_inline rt_atomic_t rt_atomic_fetch_add_unless(volatile rt_atomic_t *ptr, rt_atomic_t a, rt_atomic_t u)
{
rt_atomic_t c = rt_atomic_load(ptr);
do {
if (c == u)
{
break;
}
} while (!rt_atomic_compare_exchange_strong(ptr, &c, c + a));
return c;
}
rt_inline rt_bool_t rt_atomic_add_unless(volatile rt_atomic_t *ptr, rt_atomic_t a, rt_atomic_t u)
{
return rt_atomic_fetch_add_unless(ptr, a, u) != u;
}
rt_inline rt_bool_t rt_atomic_inc_not_zero(volatile rt_atomic_t *ptr)
{
return rt_atomic_add_unless(ptr, 1, 0);
}
#endif /* __cplusplus */
#endif /* __RT_ATOMIC_H__ */