Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _ARCH_X8664_LOCAL_H |
| 2 | #define _ARCH_X8664_LOCAL_H |
| 3 | |
| 4 | #include <linux/percpu.h> |
| 5 | |
| 6 | typedef struct |
| 7 | { |
| 8 | volatile unsigned int counter; |
| 9 | } local_t; |
| 10 | |
| 11 | #define LOCAL_INIT(i) { (i) } |
| 12 | |
| 13 | #define local_read(v) ((v)->counter) |
| 14 | #define local_set(v,i) (((v)->counter) = (i)) |
| 15 | |
| 16 | static __inline__ void local_inc(local_t *v) |
| 17 | { |
| 18 | __asm__ __volatile__( |
| 19 | "incl %0" |
| 20 | :"=m" (v->counter) |
| 21 | :"m" (v->counter)); |
| 22 | } |
| 23 | |
| 24 | static __inline__ void local_dec(local_t *v) |
| 25 | { |
| 26 | __asm__ __volatile__( |
| 27 | "decl %0" |
| 28 | :"=m" (v->counter) |
| 29 | :"m" (v->counter)); |
| 30 | } |
| 31 | |
Andi Kleen | 2ade814 | 2005-09-12 18:49:25 +0200 | [diff] [blame^] | 32 | static __inline__ void local_add(unsigned int i, local_t *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | { |
| 34 | __asm__ __volatile__( |
| 35 | "addl %1,%0" |
| 36 | :"=m" (v->counter) |
| 37 | :"ir" (i), "m" (v->counter)); |
| 38 | } |
| 39 | |
Andi Kleen | 2ade814 | 2005-09-12 18:49:25 +0200 | [diff] [blame^] | 40 | static __inline__ void local_sub(unsigned int i, local_t *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
| 42 | __asm__ __volatile__( |
| 43 | "subl %1,%0" |
| 44 | :"=m" (v->counter) |
| 45 | :"ir" (i), "m" (v->counter)); |
| 46 | } |
| 47 | |
Andi Kleen | 1c17340 | 2005-04-16 15:25:08 -0700 | [diff] [blame] | 48 | /* On x86-64 these are better than the atomic variants on SMP kernels |
| 49 | because they dont use a lock prefix. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)) |
| 54 | |
| 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. |
| 58 | * |
| 59 | * This could be done better if we moved the per cpu data directly |
| 60 | * after GS. |
| 61 | */ |
| 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)) |
| 68 | |
| 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)) |
| 73 | |
| 74 | #endif /* _ARCH_I386_LOCAL_H */ |