103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef _ALPHA_LOCAL_H
|
||
|
|
#define _ALPHA_LOCAL_H
|
||
|
|
|
||
|
|
#include <linux/percpu.h>
|
||
|
|
#include <linux/atomic.h>
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
atomic_long_t a;
|
||
|
|
} local_t;
|
||
|
|
|
||
|
|
#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
|
||
|
|
#define local_read(l) atomic_long_read(&(l)->a)
|
||
|
|
#define local_set(l,i) atomic_long_set(&(l)->a, (i))
|
||
|
|
#define local_inc(l) atomic_long_inc(&(l)->a)
|
||
|
|
#define local_dec(l) atomic_long_dec(&(l)->a)
|
||
|
|
#define local_add(i,l) atomic_long_add((i),(&(l)->a))
|
||
|
|
#define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
|
||
|
|
|
||
|
|
static __inline__ long local_add_return(long i, local_t * l)
|
||
|
|
{
|
||
|
|
long temp, result;
|
||
|
|
__asm__ __volatile__(
|
||
|
|
"1: ldq_l %0,%1\n"
|
||
|
|
" addq %0,%3,%2\n"
|
||
|
|
" addq %0,%3,%0\n"
|
||
|
|
" stq_c %0,%1\n"
|
||
|
|
" beq %0,2f\n"
|
||
|
|
".subsection 2\n"
|
||
|
|
"2: br 1b\n"
|
||
|
|
".previous"
|
||
|
|
:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
|
||
|
|
:"Ir" (i), "m" (l->a.counter) : "memory");
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ long local_sub_return(long i, local_t * l)
|
||
|
|
{
|
||
|
|
long temp, result;
|
||
|
|
__asm__ __volatile__(
|
||
|
|
"1: ldq_l %0,%1\n"
|
||
|
|
" subq %0,%3,%2\n"
|
||
|
|
" subq %0,%3,%0\n"
|
||
|
|
" stq_c %0,%1\n"
|
||
|
|
" beq %0,2f\n"
|
||
|
|
".subsection 2\n"
|
||
|
|
"2: br 1b\n"
|
||
|
|
".previous"
|
||
|
|
:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
|
||
|
|
:"Ir" (i), "m" (l->a.counter) : "memory");
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define local_cmpxchg(l, o, n) \
|
||
|
|
(cmpxchg_local(&((l)->a.counter), (o), (n)))
|
||
|
|
#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* local_add_unless - add unless the number is a given value
|
||
|
|
* @l: pointer of type local_t
|
||
|
|
* @a: the amount to add to l...
|
||
|
|
* @u: ...unless l is equal to u.
|
||
|
|
*
|
||
|
|
* Atomically adds @a to @l, so long as it was not @u.
|
||
|
|
* Returns non-zero if @l was not @u, and zero otherwise.
|
||
|
|
*/
|
||
|
|
#define local_add_unless(l, a, u) \
|
||
|
|
({ \
|
||
|
|
long c, old; \
|
||
|
|
c = local_read(l); \
|
||
|
|
for (;;) { \
|
||
|
|
if (unlikely(c == (u))) \
|
||
|
|
break; \
|
||
|
|
old = local_cmpxchg((l), c, c + (a)); \
|
||
|
|
if (likely(old == c)) \
|
||
|
|
break; \
|
||
|
|
c = old; \
|
||
|
|
} \
|
||
|
|
c != (u); \
|
||
|
|
})
|
||
|
|
#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
|
||
|
|
|
||
|
|
#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
|
||
|
|
|
||
|
|
#define local_dec_return(l) local_sub_return(1,(l))
|
||
|
|
|
||
|
|
#define local_inc_return(l) local_add_return(1,(l))
|
||
|
|
|
||
|
|
#define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
|
||
|
|
|
||
|
|
#define local_inc_and_test(l) (local_add_return(1, (l)) == 0)
|
||
|
|
|
||
|
|
#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
|
||
|
|
|
||
|
|
/* Verify if faster than atomic ops */
|
||
|
|
#define __local_inc(l) ((l)->a.counter++)
|
||
|
|
#define __local_dec(l) ((l)->a.counter++)
|
||
|
|
#define __local_add(i,l) ((l)->a.counter+=(i))
|
||
|
|
#define __local_sub(i,l) ((l)->a.counter-=(i))
|
||
|
|
|
||
|
|
#endif /* _ALPHA_LOCAL_H */
|