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/* $OpenBSD: atomic.h,v 1.17 2017/05/12 08:53:46 mpi Exp $ */
/* Public Domain */
#ifndef _ARM_ATOMIC_H_
#define _ARM_ATOMIC_H_
/*
* Compare and set:
* ret = *ptr
* if (ret == expect)
* *ptr = new
* return (ret)
*/
#define _def_atomic_cas(_f, _t) \
static inline _t \
_f(volatile _t *p, _t e, _t n) \
{ \
_t ret, modified; \
\
__asm volatile ( \
"1: ldrex %0, [%4] \n\t" \
" cmp %0, %3 \n\t" \
" bne 2f \n\t" \
" strex %1, %2, [%4] \n\t" \
" cmp %1, #0 \n\t" \
" bne 1b \n\t" \
" b 3f \n\t" \
"2: clrex \n\t" \
"3: \n\t" \
: "=&r" (ret), "=&r" (modified) \
: "r" (n), "r" (e), "r" (p) \
: "memory", "cc" \
); \
return (ret); \
}
_def_atomic_cas(_atomic_cas_uint, unsigned int)
_def_atomic_cas(_atomic_cas_ulong, unsigned long)
#undef _def_atomic_cas
#define atomic_cas_uint(_p, _e, _n) _atomic_cas_uint((_p), (_e), (_n))
#define atomic_cas_ulong(_p, _e, _n) _atomic_cas_ulong((_p), (_e), (_n))
static inline void *
_atomic_cas_ptr(volatile void *p, void *e, void *n)
{
void *ret;
uint32_t modified;
__asm volatile (
"1: ldrex %0, [%4] \n\t"
" cmp %0, %3 \n\t"
" bne 2f \n\t"
" strex %1, %2, [%4] \n\t"
" cmp %1, #0 \n\t"
" bne 1b \n\t"
" b 3f \n\t"
"2: clrex \n\t"
"3: \n\t"
: "=&r" (ret), "=&r" (modified)
: "r" (n), "r" (e), "r" (p)
: "memory", "cc"
);
return (ret);
}
#define atomic_cas_ptr(_p, _e, _n) _atomic_cas_ptr((_p), (_e), (_n))
/*
* Swap:
* ret = *p
* *p = val
* return (ret)
*/
#define _def_atomic_swap(_f, _t) \
static inline _t \
_f(volatile _t *p, _t v) \
{ \
_t ret, modified; \
\
__asm volatile ( \
"1: ldrex %0, [%3] \n\t" \
" strex %1, %2, [%3] \n\t" \
" cmp %1, #0 \n\t" \
" bne 1b \n\t" \
: "=&r" (ret), "=&r" (modified) \
: "r" (v), "r" (p) \
: "memory", "cc" \
); \
return (ret); \
}
_def_atomic_swap(_atomic_swap_uint, unsigned int)
_def_atomic_swap(_atomic_swap_ulong, unsigned long)
#undef _def_atomic_swap
#define atomic_swap_uint(_p, _v) _atomic_swap_uint((_p), (_v))
#define atomic_swap_ulong(_p, _v) _atomic_swap_ulong((_p), (_v))
static inline void *
_atomic_swap_ptr(volatile void *p, void *v)
{
void *ret;
uint32_t modified;
__asm volatile (
"1: ldrex %0, [%3] \n\t"
" strex %1, %2, [%3] \n\t"
" cmp %1, #0 \n\t"
" bne 1b \n\t"
: "=&r" (ret), "=&r" (modified)
: "r" (v), "r" (p)
: "memory", "cc"
);
return (ret);
}
#define atomic_swap_ptr(_p, _v) _atomic_swap_ptr((_p), (_v))
/*
* Increment returning the new value
* *p += 1
* return (*p)
*/
#define _def_atomic_inc_nv(_f, _t) \
static inline _t \
_f(volatile _t *p) \
{ \
_t ret, modified; \
\
__asm volatile ( \
"1: ldrex %0, [%2] \n\t" \
" add %0, %0, #1 \n\t" \
" strex %1, %0, [%2] \n\t" \
" cmp %1, #0 \n\t" \
" bne 1b \n\t" \
: "=&r" (ret), "=&r" (modified) \
: "r" (p) \
: "memory", "cc" \
); \
return (ret); \
}
_def_atomic_inc_nv(_atomic_inc_int_nv, unsigned int)
_def_atomic_inc_nv(_atomic_inc_long_nv, unsigned long)
#undef _def_atomic_inc_nv
#define atomic_inc_int_nv(_p) _atomic_inc_int_nv((_p))
#define atomic_inc_long_nv(_p) _atomic_inc_long_nv((_p))
/*
* Decrement returning the new value
* *p -= 1
* return (*p)
*/
#define _def_atomic_dec_nv(_f, _t) \
static inline _t \
_f(volatile _t *p) \
{ \
_t ret, modified; \
\
__asm volatile ( \
"1: ldrex %0, [%2] \n\t" \
" sub %0, %0, #1 \n\t" \
" strex %1, %0, [%2] \n\t" \
" cmp %1, #0 \n\t" \
" bne 1b \n\t" \
: "=&r" (ret), "=&r" (modified) \
: "r" (p) \
: "memory", "cc" \
); \
return (ret); \
}
_def_atomic_dec_nv(_atomic_dec_int_nv, unsigned int)
_def_atomic_dec_nv(_atomic_dec_long_nv, unsigned long)
#undef _def_atomic_dec_nv
#define atomic_dec_int_nv(_p) _atomic_dec_int_nv((_p))
#define atomic_dec_long_nv(_p) _atomic_dec_long_nv((_p))
/*
* Addition returning the new value
* *p += v
* return (*p)
*/
#define _def_atomic_add_nv(_f, _t) \
static inline _t \
_f(volatile _t *p, _t v) \
{ \
_t ret, modified; \
\
__asm volatile ( \
"1: ldrex %0, [%2] \n\t" \
" add %0, %0, %3 \n\t" \
" strex %1, %0, [%2] \n\t" \
" cmp %1, #0 \n\t" \
" bne 1b \n\t" \
: "=&r" (ret), "=&r" (modified) \
: "r" (p), "r" (v) \
: "memory", "cc" \
); \
return (ret); \
}
_def_atomic_add_nv(_atomic_add_int_nv, unsigned int)
_def_atomic_add_nv(_atomic_add_long_nv, unsigned long)
#undef _def_atomic_add_nv
#define atomic_add_int_nv(_p, _v) _atomic_add_int_nv((_p), (_v))
#define atomic_add_long_nv(_p, _v) _atomic_add_long_nv((_p), (_v))
/*
* Subtraction returning the new value
* *p -= v
* return (*p)
*/
#define _def_atomic_sub_nv(_f, _t) \
static inline _t \
_f(volatile _t *p, _t v) \
{ \
_t ret, modified; \
\
__asm volatile ( \
"1: ldrex %0, [%2] \n\t" \
" sub %0, %0, %3 \n\t" \
" strex %1, %0, [%2] \n\t" \
" cmp %1, #0 \n\t" \
" bne 1b \n\t" \
: "=&r" (ret), "=&r" (modified) \
: "r" (p), "r" (v) \
: "memory", "cc" \
); \
return (ret); \
}
_def_atomic_sub_nv(_atomic_sub_int_nv, unsigned int)
_def_atomic_sub_nv(_atomic_sub_long_nv, unsigned long)
#undef _def_atomic_sub_nv
#define atomic_sub_int_nv(_p, _v) _atomic_sub_int_nv((_p), (_v))
#define atomic_sub_long_nv(_p, _v) _atomic_sub_long_nv((_p), (_v))
#define __membar(_f) do { __asm __volatile(_f ::: "memory"); } while (0)
#define membar_enter() __membar("dmb sy")
#define membar_exit() __membar("dmb sy")
#define membar_producer() __membar("dmb st")
#define membar_consumer() __membar("dmb sy")
#define membar_sync() __membar("dmb sy")
#if defined(_KERNEL)
/* virtio needs MP membars even on SP kernels */
#define virtio_membar_producer() __membar("dmb st")
#define virtio_membar_consumer() __membar("dmb sy")
#define virtio_membar_sync() __membar("dmb sy")
/*
* Set bits
* *p = *p | v
*/
static inline void
atomic_setbits_int(volatile unsigned int *p, unsigned int v)
{
unsigned int modified, tmp;
__asm volatile (
"1: ldrex %0, [%3] \n\t"
" orr %0, %0, %2 \n\t"
" strex %1, %0, [%3] \n\t"
" cmp %1, #0 \n\t"
" bne 1b \n\t"
: "=&r" (tmp), "=&r" (modified)
: "r" (v), "r" (p)
: "memory", "cc"
);
}
/*
* Clear bits
* *p = *p & (~v)
*/
static inline void
atomic_clearbits_int(volatile unsigned int *p, unsigned int v)
{
unsigned int modified, tmp;
__asm volatile (
"1: ldrex %0, [%3] \n\t"
" bic %0, %0, %2 \n\t"
" strex %1, %0, [%3] \n\t"
" cmp %1, #0 \n\t"
" bne 1b \n\t"
: "=&r" (tmp), "=&r" (modified)
: "r" (v), "r" (p)
: "memory", "cc"
);
}
#endif /* defined(_KERNEL) */
#endif /* _ARM_ATOMIC_H_ */
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