1#include <errno.h>
 2#include "syscall.h"
 3#include "atomic.h"
 4
 5#ifdef SYS_cacheflush
 6int _flush_cache(void *addr, int len, int op)
 7{
 8	return syscall(SYS_cacheflush, addr, len, op);
 9}
10weak_alias(_flush_cache, cacheflush);
11#endif
12
13#ifdef SYS_cachectl
14int __cachectl(void *addr, int len, int op)
15{
16	return syscall(SYS_cachectl, addr, len, op);
17}
18weak_alias(__cachectl, cachectl);
19#endif
20
21#ifdef SYS_riscv_flush_icache
22
23#define VDSO_FLUSH_ICACHE_SYM "__vdso_flush_icache"
24#define VDSO_FLUSH_ICACHE_VER "LINUX_4.15"
25
26static void *volatile vdso_func;
27
28static int flush_icache_init(void *start, void *end, unsigned long int flags)
29{
30	void *p = __vdsosym(VDSO_FLUSH_ICACHE_VER, VDSO_FLUSH_ICACHE_SYM);
31	int (*f)(void *, void *, unsigned long int) =
32		(int (*)(void *, void *, unsigned long int))p;
33	a_cas_p(&vdso_func, (void *)flush_icache_init, p);
34	return f ? f(start, end, flags) : -ENOSYS;
35}
36
37static void *volatile vdso_func = (void *)flush_icache_init;
38
39int __riscv_flush_icache(void *start, void *end, unsigned long int flags) 
40{
41	int (*f)(void *, void *, unsigned long int) =
42		(int (*)(void *, void *, unsigned long int))vdso_func;
43	if (f) {
44		int r = f(start, end, flags);
45		if (!r) return r;
46		if (r != -ENOSYS) return __syscall_ret(r);
47	}
48	return syscall(SYS_riscv_flush_icache, start, end, flags);
49}
50weak_alias(__riscv_flush_icache, riscv_flush_icache);
51#endif