67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef __ARCH_H8300_CMPXCHG__
|
||
|
|
#define __ARCH_H8300_CMPXCHG__
|
||
|
|
|
||
|
|
#include <linux/irqflags.h>
|
||
|
|
|
||
|
|
#define xchg(ptr, x) \
|
||
|
|
((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \
|
||
|
|
sizeof(*(ptr))))
|
||
|
|
|
||
|
|
struct __xchg_dummy { unsigned long a[100]; };
|
||
|
|
#define __xg(x) ((volatile struct __xchg_dummy *)(x))
|
||
|
|
|
||
|
|
static inline unsigned long __xchg(unsigned long x,
|
||
|
|
volatile void *ptr, int size)
|
||
|
|
{
|
||
|
|
unsigned long tmp, flags;
|
||
|
|
|
||
|
|
local_irq_save(flags);
|
||
|
|
|
||
|
|
switch (size) {
|
||
|
|
case 1:
|
||
|
|
__asm__ __volatile__
|
||
|
|
("mov.b %2,%0\n\t"
|
||
|
|
"mov.b %1,%2"
|
||
|
|
: "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
__asm__ __volatile__
|
||
|
|
("mov.w %2,%0\n\t"
|
||
|
|
"mov.w %1,%2"
|
||
|
|
: "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
__asm__ __volatile__
|
||
|
|
("mov.l %2,%0\n\t"
|
||
|
|
"mov.l %1,%2"
|
||
|
|
: "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
tmp = 0;
|
||
|
|
}
|
||
|
|
local_irq_restore(flags);
|
||
|
|
return tmp;
|
||
|
|
}
|
||
|
|
|
||
|
|
#include <asm-generic/cmpxchg-local.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
|
||
|
|
* them available.
|
||
|
|
*/
|
||
|
|
#define cmpxchg_local(ptr, o, n) \
|
||
|
|
((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \
|
||
|
|
(unsigned long)(o), \
|
||
|
|
(unsigned long)(n), \
|
||
|
|
sizeof(*(ptr))))
|
||
|
|
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
|
||
|
|
|
||
|
|
#ifndef CONFIG_SMP
|
||
|
|
#include <asm-generic/cmpxchg.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
|
||
|
|
|
||
|
|
#endif /* __ARCH_H8300_CMPXCHG__ */
|