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Add the implementation of atomic_swap_32().

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This commit is contained in:
Ruslan Bukin 2016-02-17 14:32:03 +00:00
parent f936aa4a3a
commit 5fe191b01e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=295701
1 changed files with 13 additions and 0 deletions
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13
sys/riscv/include/atomic.h
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@ -310,6 +310,19 @@ atomic_readandclear_64(volatile uint64_t *p)
return (ret);
}
static __inline uint32_t
atomic_swap_32(volatile uint32_t *p, uint32_t val)
{
uint32_t old;
__asm __volatile("amoswap.w %0, %2, %1"
: "=&r"(old), "+A" (*p)
: "r" (val)
: "memory");
return (old);
}
static __inline uint64_t
atomic_swap_64(volatile uint64_t *p, uint64_t val)
{