74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
#ifndef _ARCH_X8664_LOCAL_H
|
|
#define _ARCH_X8664_LOCAL_H
|
|
|
|
#include <linux/percpu.h>
|
|
|
|
typedef struct
|
|
{
|
|
volatile unsigned int counter;
|
|
} local_t;
|
|
|
|
#define LOCAL_INIT(i) { (i) }
|
|
|
|
#define local_read(v) ((v)->counter)
|
|
#define local_set(v,i) (((v)->counter) = (i))
|
|
|
|
static __inline__ void local_inc(local_t *v)
|
|
{
|
|
__asm__ __volatile__(
|
|
"incl %0"
|
|
:"=m" (v->counter)
|
|
:"m" (v->counter));
|
|
}
|
|
|
|
static __inline__ void local_dec(local_t *v)
|
|
{
|
|
__asm__ __volatile__(
|
|
"decl %0"
|
|
:"=m" (v->counter)
|
|
:"m" (v->counter));
|
|
}
|
|
|
|
static __inline__ void local_add(unsigned int i, local_t *v)
|
|
{
|
|
__asm__ __volatile__(
|
|
"addl %1,%0"
|
|
:"=m" (v->counter)
|
|
:"ir" (i), "m" (v->counter));
|
|
}
|
|
|
|
static __inline__ void local_sub(unsigned int i, local_t *v)
|
|
{
|
|
__asm__ __volatile__(
|
|
"subl %1,%0"
|
|
:"=m" (v->counter)
|
|
:"ir" (i), "m" (v->counter));
|
|
}
|
|
|
|
/* On x86-64 these are better than the atomic variants on SMP kernels
|
|
because they dont use a lock prefix. */
|
|
#define __local_inc(l) local_inc(l)
|
|
#define __local_dec(l) local_dec(l)
|
|
#define __local_add(i,l) local_add((i),(l))
|
|
#define __local_sub(i,l) local_sub((i),(l))
|
|
|
|
/* Use these for per-cpu local_t variables: on some archs they are
|
|
* much more efficient than these naive implementations. Note they take
|
|
* a variable, not an address.
|
|
*
|
|
* This could be done better if we moved the per cpu data directly
|
|
* after GS.
|
|
*/
|
|
#define cpu_local_read(v) local_read(&__get_cpu_var(v))
|
|
#define cpu_local_set(v, i) local_set(&__get_cpu_var(v), (i))
|
|
#define cpu_local_inc(v) local_inc(&__get_cpu_var(v))
|
|
#define cpu_local_dec(v) local_dec(&__get_cpu_var(v))
|
|
#define cpu_local_add(i, v) local_add((i), &__get_cpu_var(v))
|
|
#define cpu_local_sub(i, v) local_sub((i), &__get_cpu_var(v))
|
|
|
|
#define __cpu_local_inc(v) cpu_local_inc(v)
|
|
#define __cpu_local_dec(v) cpu_local_dec(v)
|
|
#define __cpu_local_add(i, v) cpu_local_add((i), (v))
|
|
#define __cpu_local_sub(i, v) cpu_local_sub((i), (v))
|
|
|
|
#endif /* _ARCH_I386_LOCAL_H */
|