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#ifndef __CR_ATOMIC_H__
#define __CR_ATOMIC_H__
#include <linux/types.h>
#include "common/compiler.h"
#include "common/arch/mips/asm/utils.h"
#include "common/arch/mips/asm/cmpxchg.h"
/*
* atomic_read - read atomic variable
* @v: pointer of type atomic_t
*
* Atomically reads the value of @v.
*/
#define atomic_read(v) (*(volatile int *)&(v)->counter)
/*
* atomic_set - set atomic variable
* @v: pointer of type atomic_t
* @i: required value
*
* Atomically sets the value of @v to @i.
*/
#define atomic_set(v, i) ((v)->counter = (i))
/*
* atomic_add - add integer to atomic variable
* @i: integer value to add
* @v: pointer of type atomic_t
*
* Atomically adds @i to @v.
*/
static __inline__ void atomic_add(int i, atomic_t *v)
{
int temp;
do {
__asm__ __volatile__(" .set mips3 \n"
" ll %0, %1 # atomic_add \n"
" addu %0, %2 \n"
" sc %0, %1 \n"
" .set mips0 \n"
: "=&r"(temp), "+m"(v->counter)
: "Ir"(i));
} while (unlikely(!temp));
}
/*
* atomic_sub - subtract the atomic variable
* @i: integer value to subtract
* @v: pointer of type atomic_t
*
* Atomically subtracts @i from @v.
*/
static __inline__ void atomic_sub(int i, atomic_t *v)
{
int temp;
do {
__asm__ __volatile__(" .set mips3 \n"
" ll %0, %1 # atomic_sub \n"
" subu %0, %2 \n"
" sc %0, %1 \n"
" .set mips0 \n"
: "=&r"(temp), "+m"(v->counter)
: "Ir"(i));
} while (unlikely(!temp));
}
/*
* Same as above, but return the result value
*/
static __inline__ int atomic_add_return(int i, atomic_t *v)
{
int result;
smp_mb__before_llsc();
int temp;
do {
__asm__ __volatile__(" .set mips3 \n"
" ll %1, %2 # atomic_add_return \n"
" addu %0, %1, %3 \n"
" sc %0, %2 \n"
" .set mips0 \n"
: "=&r"(result), "=&r"(temp), "+m"(v->counter)
: "Ir"(i));
} while (unlikely(!result));
result = temp + i;
smp_llsc_mb();
return result;
}
static __inline__ int atomic_sub_return(int i, atomic_t *v)
{
int result;
smp_mb__before_llsc();
int temp;
do {
__asm__ __volatile__(" .set mips3 \n"
" ll %1, %2 # atomic_sub_return \n"
" subu %0, %1, %3 \n"
" sc %0, %2 \n"
" .set mips0 \n"
: "=&r"(result), "=&r"(temp), "+m"(v->counter)
: "Ir"(i));
} while (unlikely(!result));
result = temp - i;
smp_llsc_mb();
return result;
}
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
#define atomic_dec_return(v) atomic_sub_return(1, (v))
#define atomic_inc_return(v) atomic_add_return(1, (v))
/*
* atomic_inc - increment atomic variable
* @v: pointer of type atomic_t
*
* Atomically increments @v by 1.
*/
#define atomic_inc(v) atomic_add(1, (v))
/*
* atomic_dec - decrement and test
* @v: pointer of type atomic_t
*
* Atomically decrements @v by 1.
*/
#define atomic_dec(v) atomic_sub(1, (v))
#endif /* __CR_ATOMIC_H__ */
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