src/include/smp_sync.h


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#ifndef SMP_SYNC_INCLUDED
#define SMP_SYNC_INCLUDED

static inline void lock(uint8_t *lock) {
  asm("mov al, 1\n"
      "spinlock:\n"
      "lock xchgb [%0], al\n"
      "test al, al\n"
      "jnz spinlock\n"
      ::"r"(lock):"al");
} 

static inline void unlock(uint8_t *lock) {
  asm("lock andb [%0], 0"::"r"(lock));
}

#endif