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/* $OpenBSD: atomic.h,v 1.7 2014/10/12 20:39:46 miod Exp $ */
/* Public Domain */
#ifndef _MACHINE_ATOMIC_H_
#define _MACHINE_ATOMIC_H_
#if defined(_KERNEL)
typedef volatile u_int __cpu_simple_lock_t __attribute__((__aligned__(16)));
#define __SIMPLELOCK_LOCKED 0
#define __SIMPLELOCK_UNLOCKED 1
static inline void
__cpu_simple_lock_init(__cpu_simple_lock_t *l)
{
*l = __SIMPLELOCK_UNLOCKED;
}
static inline unsigned int
__cpu_simple_lock_ldcws(__cpu_simple_lock_t *l)
{
unsigned int o;
asm volatile("ldcws 0(%2), %0" : "=&r" (o), "+m" (l) : "r" (l));
return (o);
}
static inline void
__cpu_simple_lock(__cpu_simple_lock_t *l)
{
while (__cpu_simple_lock_ldcws(l) == __SIMPLELOCK_UNLOCKED)
;
}
static inline int
__cpu_simple_lock_try(__cpu_simple_lock_t *l)
{
return (__cpu_simple_lock_ldcws(l) == __SIMPLELOCK_UNLOCKED);
}
static inline void
__cpu_simple_unlock(__cpu_simple_lock_t *l)
{
*l = __SIMPLELOCK_UNLOCKED;
}
#ifdef MULTIPROCESSOR
extern __cpu_simple_lock_t atomic_lock;
#define ATOMIC_LOCK __cpu_simple_lock(&atomic_lock);
#define ATOMIC_UNLOCK __cpu_simple_unlock(&atomic_lock);
#else
#define ATOMIC_LOCK
#define ATOMIC_UNLOCK
#endif
static inline register_t
atomic_enter(void)
{
register_t eiem;
__asm volatile("mfctl %%cr15, %0": "=r" (eiem));
__asm volatile("mtctl %r0, %cr15");
ATOMIC_LOCK;
return (eiem);
}
static inline void
atomic_leave(register_t eiem)
{
ATOMIC_UNLOCK;
__asm volatile("mtctl %0, %%cr15":: "r" (eiem));
}
static inline unsigned int
_atomic_cas_uint(volatile unsigned int *uip, unsigned int o, unsigned int n)
{
register_t eiem;
unsigned int rv;
eiem = atomic_enter();
rv = *uip;
if (rv == o)
*uip = n;
atomic_leave(eiem);
return (rv);
}
#define atomic_cas_uint(_p, _o, _n) _atomic_cas_uint((_p), (_o), (_n))
static inline unsigned long
_atomic_cas_ulong(volatile unsigned long *uip, unsigned long o, unsigned long n)
{
register_t eiem;
unsigned long rv;
eiem = atomic_enter();
rv = *uip;
if (rv == o)
*uip = n;
atomic_leave(eiem);
return (rv);
}
#define atomic_cas_ulong(_p, _o, _n) _atomic_cas_ulong((_p), (_o), (_n))
static inline void *
_atomic_cas_ptr(volatile void *uip, void *o, void *n)
{
register_t eiem;
void * volatile *uipp = (void * volatile *)uip;
void *rv;
eiem = atomic_enter();
rv = *uipp;
if (rv == o)
*uipp = n;
atomic_leave(eiem);
return (rv);
}
#define atomic_cas_ptr(_p, _o, _n) _atomic_cas_ptr((_p), (_o), (_n))
static inline unsigned int
_atomic_swap_uint(volatile unsigned int *uip, unsigned int n)
{
register_t eiem;
unsigned int rv;
eiem = atomic_enter();
rv = *uip;
*uip = n;
atomic_leave(eiem);
return (rv);
}
#define atomic_swap_uint(_p, _n) _atomic_swap_uint((_p), (_n))
static inline unsigned long
_atomic_swap_ulong(volatile unsigned long *uip, unsigned long n)
{
register_t eiem;
unsigned long rv;
eiem = atomic_enter();
rv = *uip;
*uip = n;
atomic_leave(eiem);
return (rv);
}
#define atomic_swap_ulong(_p, _n) _atomic_swap_ulong((_p), (_n))
static inline void *
_atomic_swap_ptr(volatile void *uip, void *n)
{
register_t eiem;
void * volatile *uipp = (void * volatile *)uip;
void *rv;
eiem = atomic_enter();
rv = *uipp;
*uipp = n;
atomic_leave(eiem);
return (rv);
}
#define atomic_swap_ptr(_p, _n) _atomic_swap_ptr((_p), (_n))
static __inline unsigned int
_atomic_add_int_nv(volatile unsigned int *uip, unsigned int v)
{
register_t eiem;
unsigned int rv;
eiem = atomic_enter();
rv = *uip + v;
*uip = rv;
atomic_leave(eiem);
return (rv);
}
#define atomic_add_int_nv(_uip, _v) _atomic_add_int_nv((_uip), (_v))
#define atomic_sub_int_nv(_uip, _v) _atomic_add_int_nv((_uip), 0 - (_v))
static __inline unsigned long
_atomic_add_long_nv(volatile unsigned long *uip, unsigned long v)
{
register_t eiem;
unsigned long rv;
eiem = atomic_enter();
rv = *uip + v;
*uip = rv;
atomic_leave(eiem);
return (rv);
}
#define atomic_add_long_nv(_uip, _v) _atomic_add_long_nv((_uip), (_v))
#define atomic_sub_long_nv(_uip, _v) _atomic_add_long_nv((_uip), 0 - (_v))
static __inline void
atomic_setbits_int(volatile unsigned int *uip, unsigned int v)
{
register_t eiem;
eiem = atomic_enter();
*uip |= v;
atomic_leave(eiem);
}
static __inline void
atomic_clearbits_int(volatile unsigned int *uip, unsigned int v)
{
register_t eiem;
eiem = atomic_enter();
*uip &= ~v;
atomic_leave(eiem);
}
static __inline void
atomic_setbits_long(volatile unsigned long *uip, unsigned long v)
{
register_t eiem;
eiem = atomic_enter();
*uip |= v;
atomic_leave(eiem);
}
static __inline void
atomic_clearbits_long(volatile unsigned long *uip, unsigned long v)
{
register_t eiem;
eiem = atomic_enter();
*uip &= ~v;
atomic_leave(eiem);
}
/*
* Although the PA-RISC 2.0 architecture allows an implementation to
* be weakly ordered, all PA-RISC processers to date implement a
* strong memory ordering model. So all we need is a compiler
* barrier.
*/
static inline void
__insn_barrier(void)
{
__asm volatile("" : : : "memory");
}
#define membar_enter() __insn_barrier()
#define membar_exit() __insn_barrier()
#define membar_producer() __insn_barrier()
#define membar_consumer() __insn_barrier()
#define membar_sync() __insn_barrier()
#endif /* defined(_KERNEL) */
#endif /* _MACHINE_ATOMIC_H_ */
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