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Linux/arch/cris/include/arch-v32/arch/atomic.h

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  1 #ifndef __ASM_CRIS_ARCH_ATOMIC__
  2 #define __ASM_CRIS_ARCH_ATOMIC__
  3 
  4 #include <linux/spinlock_types.h>
  5 
  6 extern void cris_spin_unlock(void *l, int val);
  7 extern void cris_spin_lock(void *l);
  8 extern int cris_spin_trylock(void* l);
  9 
 10 #ifndef CONFIG_SMP
 11 #define cris_atomic_save(addr, flags) local_irq_save(flags);
 12 #define cris_atomic_restore(addr, flags) local_irq_restore(flags);
 13 #else
 14 
 15 extern spinlock_t cris_atomic_locks[];
 16 #define LOCK_COUNT 128
 17 #define HASH_ADDR(a) (((int)a) & 127)
 18 
 19 #define cris_atomic_save(addr, flags) \
 20   local_irq_save(flags); \
 21   cris_spin_lock((void *)&cris_atomic_locks[HASH_ADDR(addr)].raw_lock.slock);
 22 
 23 #define cris_atomic_restore(addr, flags) \
 24   { \
 25     spinlock_t *lock = (void*)&cris_atomic_locks[HASH_ADDR(addr)]; \
 26     __asm__ volatile ("move.d %1,%0" \
 27                         : "=m" (lock->raw_lock.slock) \
 28                         : "r" (1) \
 29                         : "memory"); \
 30     local_irq_restore(flags); \
 31   }
 32 
 33 #endif
 34 
 35 #endif
 36 
 37 

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