#ifndef __ARCH_M68K_ATOMIC__ #define __ARCH_M68K_ATOMIC__ #include <asm/system.h> /* local_irq_XXX() */ /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. */ /* * We do not have SMP m68k systems, so we don't have to deal with that. */ typedef struct { int counter; } atomic_t; #define ATOMIC_INIT(i) { (i) } #define atomic_read(v) ((v)->counter) #define atomic_set(v, i) (((v)->counter) = i) static inline void atomic_add(int i, atomic_t *v) { __asm__ __volatile__("addl %1,%0" : "+m" (*v) : "id" (i)); } static inline void atomic_sub(int i, atomic_t *v) { __asm__ __volatile__("subl %1,%0" : "+m" (*v) : "id" (i)); } static inline void atomic_inc(atomic_t *v) { __asm__ __volatile__("addql #1,%0" : "+m" (*v)); } static inline void atomic_dec(atomic_t *v) { __asm__ __volatile__("subql #1,%0" : "+m" (*v)); } static inline int atomic_dec_and_test(atomic_t *v) { char c; __asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "+m" (*v)); return c != 0; } static inline int atomic_inc_and_test(atomic_t *v) { char c; __asm__ __volatile__("addql #1,%1; seq %0" : "=d" (c), "+m" (*v)); return c != 0; } #ifdef CONFIG_RMW_INSNS static inline int atomic_add_return(int i, atomic_t *v) { int t, tmp; __asm__ __volatile__( "1: movel %2,%1\n" " addl %3,%1\n" " casl %2,%1,%0\n" " jne 1b" : "+m" (*v), "=&d" (t), "=&d" (tmp) : "g" (i), "2" (atomic_read(v))); return t; } static inline int atomic_sub_return(int i, atomic_t *v) { int t, tmp; __asm__ __volatile__( "1: movel %2,%1\n" " subl %3,%1\n" " casl %2,%1,%0\n" " jne 1b" : "+m" (*v), "=&d" (t), "=&d" (tmp) : "g" (i), "2" (atomic_read(v))); return t; } #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) #else /* !CONFIG_RMW_INSNS */ static inline int atomic_add_return(int i, atomic_t * v) { unsigned long flags; int t; local_irq_save(flags); t = atomic_read(v); t += i; atomic_set(v, t); local_irq_restore(flags); return t; } static inline int atomic_sub_return(int i, atomic_t * v) { unsigned long flags; int t; local_irq_save(flags); t = atomic_read(v); t -= i; atomic_set(v, t); local_irq_restore(flags); return t; } static inline int atomic_cmpxchg(atomic_t *v, int old, int new) { unsigned long flags; int prev; local_irq_save(flags); prev = atomic_read(v); if (prev == old) atomic_set(v, new); local_irq_restore(flags); return prev; } static inline int atomic_xchg(atomic_t *v, int new) { unsigned long flags; int prev; local_irq_save(flags); prev = atomic_read(v); atomic_set(v, new); local_irq_restore(flags); return prev; } #endif /* !CONFIG_RMW_INSNS */ #define atomic_dec_return(v) atomic_sub_return(1, (v)) #define atomic_inc_return(v) atomic_add_return(1, (v)) static inline int atomic_sub_and_test(int i, atomic_t *v) { char c; __asm__ __volatile__("subl %2,%1; seq %0" : "=d" (c), "+m" (*v): "g" (i)); return c != 0; } static inline int atomic_add_negative(int i, atomic_t *v) { char c; __asm__ __volatile__("addl %2,%1; smi %0" : "=d" (c), "+m" (*v): "g" (i)); return c != 0; } static inline void atomic_clear_mask(unsigned long mask, unsigned long *v) { __asm__ __volatile__("andl %1,%0" : "+m" (*v) : "id" (~(mask))); } static inline void atomic_set_mask(unsigned long mask, unsigned long *v) { __asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask)); } #define atomic_add_unless(v, a, u) \ ({ \ int c, old; \ c = atomic_read(v); \ for (;;) { \ if (unlikely(c == (u))) \ break; \ old = atomic_cmpxchg((v), c, c + (a)); \ if (likely(old == c)) \ break; \ c = old; \ } \ c != (u); \ }) #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) /* Atomic operations are already serializing */ #define smp_mb__before_atomic_dec() barrier() #define smp_mb__after_atomic_dec() barrier() #define smp_mb__before_atomic_inc() barrier() #define smp_mb__after_atomic_inc() barrier() #include <asm-generic/atomic.h> #endif /* __ARCH_M68K_ATOMIC __ */