summaryrefslogtreecommitdiff
path: root/arch/riscv64/atomic_arch.h
blob: c976534284aa765d1ba32bf615d7e30da09bb5f4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
#define a_barrier a_barrier
static inline void a_barrier()
{
	__asm__ __volatile__ ("fence rw,rw" : : : "memory");
}

#define a_cas a_cas
static inline int a_cas(volatile int *p, int t, int s)
{
	int old, tmp;
	__asm__ __volatile__ (
		"\n1:	lr.w.aqrl %0, (%2)\n"
		"	bne %0, %3, 1f\n"
		"	sc.w.aqrl %1, %4, (%2)\n"
		"	bnez %1, 1b\n"
		"1:"
		: "=&r"(old), "=r"(tmp)
		: "r"(p), "r"(t), "r"(s)
		: "memory");
	return old;
}

#define a_cas_p a_cas_p
static inline void *a_cas_p(volatile void *p, void *t, void *s)
{
	void *old;
	int tmp;
	__asm__ __volatile__ (
		"\n1:	lr.d.aqrl %0, (%2)\n"
		"	bne %0, %3, 1f\n"
		"	sc.d.aqrl %1, %4, (%2)\n"
		"	bnez %1, 1b\n"
		"1:"
		: "=&r"(old), "=r"(tmp)
		: "r"(p), "r"(t), "r"(s)
		: "memory");
	return old;
}