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