[CONNECTOR]: Update documentation to match reality.
[linux-2.6/verdex.git] / include / asm-x86_64 / local.h
blob3e72c41727c53af2f7ea75666aab6da56be79a5f
1 #ifndef _ARCH_X8664_LOCAL_H
2 #define _ARCH_X8664_LOCAL_H
4 #include <linux/percpu.h>
6 typedef struct
8 volatile unsigned int counter;
9 } local_t;
11 #define LOCAL_INIT(i) { (i) }
13 #define local_read(v) ((v)->counter)
14 #define local_set(v,i) (((v)->counter) = (i))
16 static __inline__ void local_inc(local_t *v)
18 __asm__ __volatile__(
19 "incl %0"
20 :"=m" (v->counter)
21 :"m" (v->counter));
24 static __inline__ void local_dec(local_t *v)
26 __asm__ __volatile__(
27 "decl %0"
28 :"=m" (v->counter)
29 :"m" (v->counter));
32 static __inline__ void local_add(unsigned int i, local_t *v)
34 __asm__ __volatile__(
35 "addl %1,%0"
36 :"=m" (v->counter)
37 :"ir" (i), "m" (v->counter));
40 static __inline__ void local_sub(unsigned int i, local_t *v)
42 __asm__ __volatile__(
43 "subl %1,%0"
44 :"=m" (v->counter)
45 :"ir" (i), "m" (v->counter));
48 /* On x86-64 these are better than the atomic variants on SMP kernels
49 because they dont use a lock prefix. */
50 #define __local_inc(l) local_inc(l)
51 #define __local_dec(l) local_dec(l)
52 #define __local_add(i,l) local_add((i),(l))
53 #define __local_sub(i,l) local_sub((i),(l))
55 /* Use these for per-cpu local_t variables: on some archs they are
56 * much more efficient than these naive implementations. Note they take
57 * a variable, not an address.
59 * This could be done better if we moved the per cpu data directly
60 * after GS.
62 #define cpu_local_read(v) local_read(&__get_cpu_var(v))
63 #define cpu_local_set(v, i) local_set(&__get_cpu_var(v), (i))
64 #define cpu_local_inc(v) local_inc(&__get_cpu_var(v))
65 #define cpu_local_dec(v) local_dec(&__get_cpu_var(v))
66 #define cpu_local_add(i, v) local_add((i), &__get_cpu_var(v))
67 #define cpu_local_sub(i, v) local_sub((i), &__get_cpu_var(v))
69 #define __cpu_local_inc(v) cpu_local_inc(v)
70 #define __cpu_local_dec(v) cpu_local_dec(v)
71 #define __cpu_local_add(i, v) cpu_local_add((i), (v))
72 #define __cpu_local_sub(i, v) cpu_local_sub((i), (v))
74 #endif /* _ARCH_I386_LOCAL_H */