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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _ARCH_I386_LOCAL_H |
| 2 | #define _ARCH_I386_LOCAL_H |
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| 3 | |||
| 4 | #include <linux/percpu.h> |
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| 5 | |||
| 6 | typedef struct |
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| 7 | { |
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| 8 | volatile unsigned long counter; |
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| 9 | } local_t; |
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| 10 | |||
| 11 | #define LOCAL_INIT(i) { (i) } |
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| 12 | |||
| 13 | #define local_read(v) ((v)->counter) |
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| 14 | #define local_set(v,i) (((v)->counter) = (i)) |
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| 15 | |||
| 16 | static __inline__ void local_inc(local_t *v) |
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| 17 | { |
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| 18 | __asm__ __volatile__( |
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| 19 | "incl %0" |
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| 20 | :"=m" (v->counter) |
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| 21 | :"m" (v->counter)); |
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| 22 | } |
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| 23 | |||
| 24 | static __inline__ void local_dec(local_t *v) |
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| 25 | { |
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| 26 | __asm__ __volatile__( |
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| 27 | "decl %0" |
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| 28 | :"=m" (v->counter) |
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| 29 | :"m" (v->counter)); |
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| 30 | } |
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| 31 | |||
| 32 | static __inline__ void local_add(unsigned long i, local_t *v) |
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| 33 | { |
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| 34 | __asm__ __volatile__( |
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| 35 | "addl %1,%0" |
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| 36 | :"=m" (v->counter) |
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| 37 | :"ir" (i), "m" (v->counter)); |
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| 38 | } |
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| 39 | |||
| 40 | static __inline__ void local_sub(unsigned long i, local_t *v) |
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| 41 | { |
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| 42 | __asm__ __volatile__( |
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| 43 | "subl %1,%0" |
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| 44 | :"=m" (v->counter) |
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| 45 | :"ir" (i), "m" (v->counter)); |
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| 46 | } |
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| 47 | |||
| 48 | /* On x86, these are no better than the atomic variants. */ |
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| 49 | #define __local_inc(l) local_inc(l) |
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| 50 | #define __local_dec(l) local_dec(l) |
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| 51 | #define __local_add(i,l) local_add((i),(l)) |
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| 52 | #define __local_sub(i,l) local_sub((i),(l)) |
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| 53 | |||
| 54 | /* Use these for per-cpu local_t variables: on some archs they are |
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| 55 | * much more efficient than these naive implementations. Note they take |
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| 56 | * a variable, not an address. |
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| 57 | */ |
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| 58 | #define cpu_local_read(v) local_read(&__get_cpu_var(v)) |
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| 59 | #define cpu_local_set(v, i) local_set(&__get_cpu_var(v), (i)) |
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| 60 | #define cpu_local_inc(v) local_inc(&__get_cpu_var(v)) |
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| 61 | #define cpu_local_dec(v) local_dec(&__get_cpu_var(v)) |
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| 62 | #define cpu_local_add(i, v) local_add((i), &__get_cpu_var(v)) |
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| 63 | #define cpu_local_sub(i, v) local_sub((i), &__get_cpu_var(v)) |
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| 64 | |||
| 65 | #define __cpu_local_inc(v) cpu_local_inc(v) |
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| 66 | #define __cpu_local_dec(v) cpu_local_dec(v) |
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| 67 | #define __cpu_local_add(i, v) cpu_local_add((i), (v)) |
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| 68 | #define __cpu_local_sub(i, v) cpu_local_sub((i), (v)) |
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| 69 | |||
| 70 | #endif /* _ARCH_I386_LOCAL_H */ |