| #ifndef __ARCH_M68K_ATOMIC__ |
| #define __ARCH_M68K_ATOMIC__ |
| |
| /* |
| * 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), "0" (*v)); |
| } |
| |
| static __inline__ void atomic_sub(int i, atomic_t *v) |
| { |
| __asm__ __volatile__("subl %1,%0" : "=m" (*v) : "id" (i), "0" (*v)); |
| } |
| |
| static __inline__ void atomic_inc(volatile atomic_t *v) |
| { |
| __asm__ __volatile__("addql #1,%0" : "=m" (*v): "0" (*v)); |
| } |
| |
| static __inline__ void atomic_dec(volatile atomic_t *v) |
| { |
| __asm__ __volatile__("subql #1,%0" : "=m" (*v): "0" (*v)); |
| } |
| |
| static __inline__ int atomic_dec_and_test(volatile atomic_t *v) |
| { |
| char c; |
| __asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "=m" (*v): "1" (*v)); |
| return c != 0; |
| } |
| |
| #define atomic_clear_mask(mask, v) \ |
| __asm__ __volatile__("andl %1,%0" : "=m" (*v) : "id" (~(mask)),"0"(*v)) |
| |
| #define atomic_set_mask(mask, v) \ |
| __asm__ __volatile__("orl %1,%0" : "=m" (*v) : "id" (mask),"0"(*v)) |
| |
| /* 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() |
| |
| #endif /* __ARCH_M68K_ATOMIC __ */ |