1 #ifndef ARCH_AARCH64_H 2 #define ARCH_AARCH64_H 3 4 #include <unistd.h> 5 #include <stdlib.h> 6 #include <sys/types.h> 7 #include <sys/wait.h> 8 9 #define FIO_ARCH (arch_aarch64) 10 11 #ifndef __NR_ioprio_set 12 #define __NR_ioprio_set 30 13 #define __NR_ioprio_get 31 14 #endif 15 16 #define nop do { __asm__ __volatile__ ("yield"); } while (0) 17 #define read_barrier() do { __sync_synchronize(); } while (0) 18 #define write_barrier() do { __sync_synchronize(); } while (0) 19 20 static inline int arch_ffz(unsigned long bitmask) 21 { 22 unsigned long count, reversed_bits; 23 if (~bitmask == 0) /* ffz() in lib/ffz.h does this. */ 24 return 63; 25 26 __asm__ __volatile__ ("rbit %1, %2\n" 27 "clz %0, %1\n" : 28 "=r"(count), "=&r"(reversed_bits) : 29 "r"(~bitmask)); 30 return count; 31 } 32 33 #define ARCH_HAVE_FFZ 34 35 #endif 36
