src/linux/cache.c

   1 #include <errno.h>
   2 #include "syscall.h"
   3 #include "atomic.h"
   4
   5 #ifdef SYS_cacheflush
   6 int _flush_cache(void *addr, int len, int op)
   7 {
   8         return syscall(SYS_cacheflush, addr, len, op);
   9 }
  10 weak_alias(_flush_cache, cacheflush);
  11 #endif
  12
  13 #ifdef SYS_cachectl
  14 int __cachectl(void *addr, int len, int op)
  15 {
  16         return syscall(SYS_cachectl, addr, len, op);
  17 }
  18 weak_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_4.5"
  25
  26 static void *volatile vdso_func;
  27
  28 static 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
  37 static void *volatile vdso_func = (void *)flush_icache_init;
  38
  39 int __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 }
  49 weak_alias(__riscv_flush_icache, riscv_flush_icache);
  50 #endif