arch/arch-alpha.h

   1 #ifndef ARCH_ALPHA_H
   2 #define ARCH_ALPHA_H
   3
   4 #define ARCH    (arch_alpha)
   5
   6 #ifndef __NR_ioprio_set
   7 #define __NR_ioprio_set         442
   8 #define __NR_ioprio_get         443
   9 #endif
  10
  11 #ifndef __NR_fadvise64
  12 #define __NR_fadvise64          413
  13 #endif
  14
  15 #ifndef __NR_sys_splice
  16 #define __NR_sys_splice         468
  17 #define __NR_sys_tee            470
  18 #define __NR_sys_vmsplice       471
  19 #endif
  20
  21 #define nop                     do { } while (0)
  22 #define read_barrier()          __asm__ __volatile__("mb": : :"memory")
  23 #define writer_barrier()        __asm__ __volatile__("wmb": : :"memory")
  24
  25 typedef struct {
  26         volatile unsigned int lock;
  27 } spinlock_t;
  28
  29 static inline void spin_lock(spinlock_t *lock)
  30 {
  31         long tmp;
  32
  33         __asm__ __volatile__("1:     ldl_l   %0,%1\n"
  34                         "       bne     %0,2f\n"
  35                         "       lda     %0,1\n"
  36                         "       stl_c   %0,%1\n"
  37                         "       beq     %0,2f\n"
  38                         "       mb\n"
  39                         ".subsection 2\n"
  40                         "2:     ldl     %0,%1\n"
  41                         "       bne     %0,2b\n"
  42                         "       br      1b\n"
  43                         ".previous"
  44                         : "=&r" (tmp), "=m" (lock->lock)
  45                         : "m"(lock->lock) : "memory");
  46 }
  47
  48 static inline void spin_unlock(spinlock_t *lock)
  49 {
  50         read_barrier();
  51         lock->lock = 0;
  52 }
  53
  54 #define __SPIN_LOCK_UNLOCKED    { 0 }
  55
  56 #endif