2005-04-16 16:20:36 -06:00
|
|
|
#ifndef __ARCH_S390_ATOMIC__
|
|
|
|
#define __ARCH_S390_ATOMIC__
|
|
|
|
|
|
|
|
/*
|
|
|
|
* include/asm-s390/atomic.h
|
|
|
|
*
|
|
|
|
* S390 version
|
|
|
|
* Copyright (C) 1999-2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
|
|
|
|
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
|
|
|
|
* Denis Joseph Barrow,
|
|
|
|
* Arnd Bergmann (arndb@de.ibm.com)
|
|
|
|
*
|
|
|
|
* Derived from "include/asm-i386/bitops.h"
|
|
|
|
* Copyright (C) 1992, Linus Torvalds
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Atomic operations that C can't guarantee us. Useful for
|
|
|
|
* resource counting etc..
|
|
|
|
* S390 uses 'Compare And Swap' for atomicity in SMP enviroment
|
|
|
|
*/
|
|
|
|
|
|
|
|
typedef struct {
|
|
|
|
volatile int counter;
|
|
|
|
} __attribute__ ((aligned (4))) atomic_t;
|
|
|
|
#define ATOMIC_INIT(i) { (i) }
|
|
|
|
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
|
|
|
|
#define __CS_LOOP(ptr, op_val, op_string) ({ \
|
|
|
|
typeof(ptr->counter) old_val, new_val; \
|
|
|
|
__asm__ __volatile__(" l %0,0(%3)\n" \
|
|
|
|
"0: lr %1,%0\n" \
|
|
|
|
op_string " %1,%4\n" \
|
|
|
|
" cs %0,%1,0(%3)\n" \
|
|
|
|
" jl 0b" \
|
|
|
|
: "=&d" (old_val), "=&d" (new_val), \
|
|
|
|
"=m" (((atomic_t *)(ptr))->counter) \
|
|
|
|
: "a" (ptr), "d" (op_val), \
|
|
|
|
"m" (((atomic_t *)(ptr))->counter) \
|
|
|
|
: "cc", "memory" ); \
|
|
|
|
new_val; \
|
|
|
|
})
|
|
|
|
#define atomic_read(v) ((v)->counter)
|
|
|
|
#define atomic_set(v,i) (((v)->counter) = (i))
|
|
|
|
|
|
|
|
static __inline__ void atomic_add(int i, atomic_t * v)
|
|
|
|
{
|
|
|
|
__CS_LOOP(v, i, "ar");
|
|
|
|
}
|
|
|
|
static __inline__ int atomic_add_return(int i, atomic_t * v)
|
|
|
|
{
|
|
|
|
return __CS_LOOP(v, i, "ar");
|
|
|
|
}
|
|
|
|
static __inline__ int atomic_add_negative(int i, atomic_t * v)
|
|
|
|
{
|
|
|
|
return __CS_LOOP(v, i, "ar") < 0;
|
|
|
|
}
|
|
|
|
static __inline__ void atomic_sub(int i, atomic_t * v)
|
|
|
|
{
|
|
|
|
__CS_LOOP(v, i, "sr");
|
|
|
|
}
|
|
|
|
static __inline__ int atomic_sub_return(int i, atomic_t * v)
|
|
|
|
{
|
|
|
|
return __CS_LOOP(v, i, "sr");
|
|
|
|
}
|
|
|
|
static __inline__ void atomic_inc(volatile atomic_t * v)
|
|
|
|
{
|
|
|
|
__CS_LOOP(v, 1, "ar");
|
|
|
|
}
|
|
|
|
static __inline__ int atomic_inc_return(volatile atomic_t * v)
|
|
|
|
{
|
|
|
|
return __CS_LOOP(v, 1, "ar");
|
|
|
|
}
|
|
|
|
|
|
|
|
static __inline__ int atomic_inc_and_test(volatile atomic_t * v)
|
|
|
|
{
|
|
|
|
return __CS_LOOP(v, 1, "ar") == 0;
|
|
|
|
}
|
|
|
|
static __inline__ void atomic_dec(volatile atomic_t * v)
|
|
|
|
{
|
|
|
|
__CS_LOOP(v, 1, "sr");
|
|
|
|
}
|
|
|
|
static __inline__ int atomic_dec_return(volatile atomic_t * v)
|
|
|
|
{
|
|
|
|
return __CS_LOOP(v, 1, "sr");
|
|
|
|
}
|
|
|
|
static __inline__ int atomic_dec_and_test(volatile atomic_t * v)
|
|
|
|
{
|
|
|
|
return __CS_LOOP(v, 1, "sr") == 0;
|
|
|
|
}
|
|
|
|
static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t * v)
|
|
|
|
{
|
|
|
|
__CS_LOOP(v, ~mask, "nr");
|
|
|
|
}
|
|
|
|
static __inline__ void atomic_set_mask(unsigned long mask, atomic_t * v)
|
|
|
|
{
|
|
|
|
__CS_LOOP(v, mask, "or");
|
|
|
|
}
|
|
|
|
#undef __CS_LOOP
|
|
|
|
|
|
|
|
#ifdef __s390x__
|
|
|
|
typedef struct {
|
|
|
|
volatile long long counter;
|
|
|
|
} __attribute__ ((aligned (8))) atomic64_t;
|
|
|
|
#define ATOMIC64_INIT(i) { (i) }
|
|
|
|
|
|
|
|
#define __CSG_LOOP(ptr, op_val, op_string) ({ \
|
|
|
|
typeof(ptr->counter) old_val, new_val; \
|
|
|
|
__asm__ __volatile__(" lg %0,0(%3)\n" \
|
|
|
|
"0: lgr %1,%0\n" \
|
|
|
|
op_string " %1,%4\n" \
|
|
|
|
" csg %0,%1,0(%3)\n" \
|
|
|
|
" jl 0b" \
|
|
|
|
: "=&d" (old_val), "=&d" (new_val), \
|
|
|
|
"=m" (((atomic_t *)(ptr))->counter) \
|
|
|
|
: "a" (ptr), "d" (op_val), \
|
|
|
|
"m" (((atomic_t *)(ptr))->counter) \
|
|
|
|
: "cc", "memory" ); \
|
|
|
|
new_val; \
|
|
|
|
})
|
|
|
|
#define atomic64_read(v) ((v)->counter)
|
|
|
|
#define atomic64_set(v,i) (((v)->counter) = (i))
|
|
|
|
|
2005-07-27 12:44:59 -06:00
|
|
|
static __inline__ void atomic64_add(long long i, atomic64_t * v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
__CSG_LOOP(v, i, "agr");
|
|
|
|
}
|
2005-07-27 12:44:59 -06:00
|
|
|
static __inline__ long long atomic64_add_return(long long i, atomic64_t * v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
return __CSG_LOOP(v, i, "agr");
|
|
|
|
}
|
2005-07-27 12:44:59 -06:00
|
|
|
static __inline__ long long atomic64_add_negative(long long i, atomic64_t * v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
return __CSG_LOOP(v, i, "agr") < 0;
|
|
|
|
}
|
2005-07-27 12:44:59 -06:00
|
|
|
static __inline__ void atomic64_sub(long long i, atomic64_t * v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
__CSG_LOOP(v, i, "sgr");
|
|
|
|
}
|
|
|
|
static __inline__ void atomic64_inc(volatile atomic64_t * v)
|
|
|
|
{
|
|
|
|
__CSG_LOOP(v, 1, "agr");
|
|
|
|
}
|
|
|
|
static __inline__ long long atomic64_inc_return(volatile atomic64_t * v)
|
|
|
|
{
|
|
|
|
return __CSG_LOOP(v, 1, "agr");
|
|
|
|
}
|
|
|
|
static __inline__ long long atomic64_inc_and_test(volatile atomic64_t * v)
|
|
|
|
{
|
|
|
|
return __CSG_LOOP(v, 1, "agr") == 0;
|
|
|
|
}
|
|
|
|
static __inline__ void atomic64_dec(volatile atomic64_t * v)
|
|
|
|
{
|
|
|
|
__CSG_LOOP(v, 1, "sgr");
|
|
|
|
}
|
|
|
|
static __inline__ long long atomic64_dec_return(volatile atomic64_t * v)
|
|
|
|
{
|
|
|
|
return __CSG_LOOP(v, 1, "sgr");
|
|
|
|
}
|
|
|
|
static __inline__ long long atomic64_dec_and_test(volatile atomic64_t * v)
|
|
|
|
{
|
|
|
|
return __CSG_LOOP(v, 1, "sgr") == 0;
|
|
|
|
}
|
|
|
|
static __inline__ void atomic64_clear_mask(unsigned long mask, atomic64_t * v)
|
|
|
|
{
|
|
|
|
__CSG_LOOP(v, ~mask, "ngr");
|
|
|
|
}
|
|
|
|
static __inline__ void atomic64_set_mask(unsigned long mask, atomic64_t * v)
|
|
|
|
{
|
|
|
|
__CSG_LOOP(v, mask, "ogr");
|
|
|
|
}
|
|
|
|
|
|
|
|
#undef __CSG_LOOP
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
|
|
returns 0 if expected_oldval==value in *v ( swap was successful )
|
|
|
|
returns 1 if unsuccessful.
|
|
|
|
|
|
|
|
This is non-portable, use bitops or spinlocks instead!
|
|
|
|
*/
|
|
|
|
static __inline__ int
|
|
|
|
atomic_compare_and_swap(int expected_oldval,int new_val,atomic_t *v)
|
|
|
|
{
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
__asm__ __volatile__(
|
|
|
|
" lr %0,%3\n"
|
|
|
|
" cs %0,%4,0(%2)\n"
|
|
|
|
" ipm %0\n"
|
|
|
|
" srl %0,28\n"
|
|
|
|
"0:"
|
|
|
|
: "=&d" (retval), "=m" (v->counter)
|
|
|
|
: "a" (v), "d" (expected_oldval) , "d" (new_val),
|
|
|
|
"m" (v->counter) : "cc", "memory" );
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2005-11-13 17:07:24 -07:00
|
|
|
#define atomic_cmpxchg(v, o, n) (atomic_compare_and_swap((o), (n), &((v)->counter)))
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
#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()
|
|
|
|
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __ARCH_S390_ATOMIC__ */
|