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/* $OpenBSD: atomic.h,v 1.14 2018/08/22 11:25:58 aoyama Exp $ */
/* Public Domain */
#ifndef _M88K_ATOMIC_H_
#define _M88K_ATOMIC_H_
#if defined(_KERNEL)
#ifdef MULTIPROCESSOR
/* actual implementation is hairy, see atomic.S */
void atomic_setbits_int(volatile unsigned int *, unsigned int);
void atomic_clearbits_int(volatile unsigned int *, unsigned int);
unsigned int atomic_add_int_nv_mp(volatile unsigned int *, unsigned int);
unsigned int atomic_sub_int_nv_mp(volatile unsigned int *, unsigned int);
unsigned int atomic_cas_uint_mp(unsigned int *, unsigned int, unsigned int);
unsigned int atomic_swap_uint_mp(unsigned int *, unsigned int);
#define atomic_add_int_nv atomic_add_int_nv_mp
#define atomic_sub_int_nv atomic_sub_int_nv_mp
#define atomic_cas_uint atomic_cas_uint_mp
#define atomic_swap_uint atomic_swap_uint_mp
#else
#include <machine/asm_macro.h>
#include <machine/psl.h>
static __inline void
atomic_setbits_int(volatile unsigned int *uip, unsigned int v)
{
u_int psr;
psr = get_psr();
set_psr(psr | PSR_IND);
*uip |= v;
set_psr(psr);
}
static __inline void
atomic_clearbits_int(volatile unsigned int *uip, unsigned int v)
{
u_int psr;
psr = get_psr();
set_psr(psr | PSR_IND);
*uip &= ~v;
set_psr(psr);
}
static __inline unsigned int
atomic_add_int_nv_sp(volatile unsigned int *uip, unsigned int v)
{
u_int psr;
unsigned int nv;
psr = get_psr();
set_psr(psr | PSR_IND);
*uip += v;
nv = *uip;
set_psr(psr);
return nv;
}
static __inline unsigned int
atomic_sub_int_nv_sp(volatile unsigned int *uip, unsigned int v)
{
u_int psr;
unsigned int nv;
psr = get_psr();
set_psr(psr | PSR_IND);
*uip -= v;
nv = *uip;
set_psr(psr);
return nv;
}
static inline unsigned int
atomic_cas_uint_sp(unsigned int *p, unsigned int o, unsigned int n)
{
u_int psr;
unsigned int ov;
psr = get_psr();
set_psr(psr | PSR_IND);
ov = *p;
if (ov == o)
*p = n;
set_psr(psr);
return ov;
}
static inline unsigned int
atomic_swap_uint_sp(unsigned int *p, unsigned int v)
{
u_int psr;
unsigned int ov;
psr = get_psr();
set_psr(psr | PSR_IND);
ov = *p;
*p = v;
set_psr(psr);
return ov;
}
#define atomic_add_int_nv atomic_add_int_nv_sp
#define atomic_sub_int_nv atomic_sub_int_nv_sp
#define atomic_cas_uint atomic_cas_uint_sp
#define atomic_swap_uint atomic_swap_uint_sp
#endif /* MULTIPROCESSOR */
static __inline__ unsigned int
atomic_clear_int(volatile unsigned int *uip)
{
u_int oldval;
oldval = 0;
__asm__ volatile
("xmem %0, %2, %%r0" : "+r"(oldval), "+m"(*uip) : "r"(uip));
return oldval;
}
#define atomic_add_long_nv(p,v) \
((unsigned long)atomic_add_int_nv((unsigned int *)p, (unsigned int)v))
#define atomic_sub_long_nv(p,v) \
((unsigned long)atomic_sub_int_nv((unsigned int *)p, (unsigned int)v))
#define atomic_cas_ulong(p,o,n) \
((unsigned long)atomic_cas_uint((unsigned int *)p, (unsigned int)o, \
(unsigned int)n))
#define atomic_cas_ptr(p,o,n) \
((void *)atomic_cas_uint((void *)p, (void *)o, (void *)n))
#define atomic_swap_ulong(p,o) \
((unsigned long)atomic_swap_uint((unsigned int *)p, (unsigned int)o)
#define atomic_swap_ptr(p,o) \
((void *)atomic_swap_uint((void *)p, (unsigned int)o))
static inline void
__sync_synchronize(void)
{
/* flush_pipeline(); */
__asm__ volatile ("tb1 0, %%r0, 0" ::: "memory");
}
#else /* _KERNEL */
#if !defined(__GNUC__) || (__GNUC__ < 4)
/*
* Atomic routines are not available to userland, but we need to prevent
* <sys/atomic.h> from declaring them as inline wrappers of __sync_* functions,
* which are not available with gcc 3.
*/
#define atomic_cas_uint UNIMPLEMENTED
#define atomic_cas_ulong UNIMPLEMENTED
#define atomic_cas_ptr UNIMPLEMENTED
#define atomic_swap_uint UNIMPLEMENTED
#define atomic_swap_ulong UNIMPLEMENTED
#define atomic_swap_ptr UNIMPLEMENTED
#define atomic_add_int_nv UNIMPLEMENTED
#define atomic_add_long_nv UNIMPLEMENTED
#define atomic_add_int UNIMPLEMENTED
#define atomic_add_long UNIMPLEMENTED
#define atomic_inc_int UNIMPLEMENTED
#define atomic_inc_long UNIMPLEMENTED
#define atomic_sub_int_nv UNIMPLEMENTED
#define atomic_sub_long_nv UNIMPLEMENTED
#define atomic_sub_int UNIMPLEMENTED
#define atomic_sub_long UNIMPLEMENTED
#define atomic_dec_int UNIMPLEMENTED
#define atomic_dec_long UNIMPLEMENTED
/* trap numbers below 128 would cause a privileged instruction fault */
#define __membar() do { \
__asm __volatile("tb1 0, %%r0, 128" ::: "memory"); \
} while (0)
#endif /* gcc < 4 */
#define membar_enter() __membar()
#define membar_exit() __membar()
#define membar_producer() __membar()
#define membar_consumer() __membar()
#define membar_sync() __membar()
#endif /* defined(_KERNEL) */
#endif /* _M88K_ATOMIC_H_ */
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