#ifndef _ALPHA_ATOMIC_H
#define _ALPHA_ATOMIC_H
#include <asm/barrier.h>
#include <asm/system.h>
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc...
*
* But use these as seldom as possible since they are much slower
* than regular operations.
*/
/*
* Counter is volatile to make sure gcc doesn't try to be clever
* and move things around on us. We need to use _exactly_ the address
* the user gave us, not some alias that contains the same information.
*/
typedef struct { volatile int counter; } atomic_t;
typedef struct { volatile long counter; } atomic64_t;
#define ATOMIC_INIT(i) ( (atomic_t) { (i) } )
#define ATOMIC64_INIT(i) ( (atomic64_t) { (i) } )
#define atomic_read(v) ((v)->counter + 0)
#define atomic64_read(v) ((v)->counter + 0)
#define atomic_set(v,i) ((v)->counter = (i))
#define atomic64_set(v,i) ((v)->counter = (i))
/*
* To get proper branch prediction for the main line, we must branch
* forward to code at the end of this object's .text section, then
* branch back to restart the operation.
*/
static __inline__ void atomic_add(int i, atomic_t * v)
{
unsigned long temp;
__asm__ __volatile__(
"1: ldl_l %0,%1\n"
" addl %0,%2,%0\n"
" stl_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (temp), "=m" (v->counter)
:"Ir" (i), "m" (v->counter));
}
static __inline__ void atomic64_add(long i, atomic64_t * v)
{
unsigned long temp;
__asm__ __volatile__(
"1: ldq_l %0,%1\n"
" addq %0,%2,%0\n"
" stq_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (temp), "=m" (v->counter)
:"Ir" (i), "m" (v->counter));
}
static __inline__ void atomic_sub(int i, atomic_t * v)
{
unsigned long temp;
__asm__ __volatile__(
"1: ldl_l %0,%1\n"
" subl %0,%2,%0\n"
" stl_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (temp), "=m" (v->counter)
:"Ir" (i), "m" (v->counter));
}
static __inline__ void atomic64_sub(long i, atomic64_t * v)
{
unsigned long temp;
__asm__ __volatile__(
"1: ldq_l %0,%1\n"
" subq %0,%2,%0\n"
" stq_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (temp), "=m" (v->counter)
:"Ir" (i), "m" (v->counter));
}
/*
* Same as above, but return the result value
*/
static inline int atomic_add_return(int i, atomic_t *v)
{
long temp, result;
smp_mb();
__asm__ __volatile__(
"1: ldl_l %0,%1\n"
" addl %0,%3,%2\n"
" addl %0,%3,%0\n"
" stl_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (temp), "=m" (v->counter), "=&r" (result)
:"Ir" (i), "m" (v->counter) : "memory");
smp_mb();
return result;
}
static __inline__ long atomic64_add_return(long i, atomic64_t * v)
{
long temp, result;
smp_mb();
__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" (v->counter), "=&r" (result)
:"Ir" (i), "m" (v->counter) : "memory");
smp_mb();
return result;
}
static __inline__ long atomic_sub_return(int i, atomic_t * v)
{
long temp, result;
smp_mb();
__asm__ __volatile__(
"1: ldl_l %0,%1\n"
" subl %0,%3,%2\n"
" subl %0,%3,%0\n"
" stl_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (temp), "=m" (v->counter), "=&r" (result)
:"Ir" (i), "m" (v->counter) : "memory");
smp_mb();
return result;
}
static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
{
long temp, result;
smp_mb();
__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" (v->counter), "=&r" (result)
:"Ir" (i), "m" (v->counter) : "memory");
smp_mb();
return result;
}
#define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
* atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns non-zero if @v was not @u, and zero otherwise.
*/
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
for (;;) {
if (unlikely(c == (u)))
break;
old = atomic_cmpxchg((v), c, c + (a));
if (likely(old == c))
break;
c = old;
}
return c != (u);
}
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
/**
* atomic64_add_unless - add unless the number is a given value
* @v: pointer of type atomic64_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns non-zero if @v was not @u, and zero otherwise.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
long c, old;
c = atomic64_read(v);
for (;;) {
if (unlikely(c == (u)))
break;
old = atomic64_cmpxchg((v), c, c + (a));
if (likely(old == c))
break;
c = old;
}
return c != (u);
}
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
#define atomic_dec_return(v) atomic_sub_return(1,(v))
#define atomic64_dec_return(v) atomic64_sub_return(1,(v))
#define atomic_inc_return(v) atomic_add_return(1,(v))
#define atomic64_inc_return(v) atomic64_add_return(1,(v))
#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
#define atomic_inc(v) atomic_add(1,(v))
#define atomic64_inc(v) atomic64_add(1,(v))
#define atomic_dec(v) atomic_sub(1,(v))
#define atomic64_dec(v) atomic64_sub(1,(v))
#define smp_mb__before_atomic_dec() smp_mb()
#define smp_mb__after_atomic_dec() smp_mb()
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
#include <asm-generic/atomic.h>
#endif /* _ALPHA_ATOMIC_H */
