97da0d62d4
This patch introduces a few nios2-specific header files. Signed-off-by: Ley Foon Tan <lftan@altera.com>
61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
/*
|
|
* Copyright (C) 2004 Microtronix Datacom Ltd.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#ifndef _ASM_NIOS2_CMPXCHG_H
|
|
#define _ASM_NIOS2_CMPXCHG_H
|
|
|
|
#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__(
|
|
"ldb %0, %2\n"
|
|
"stb %1, %2\n"
|
|
: "=&r" (tmp)
|
|
: "r" (x), "m" (*__xg(ptr))
|
|
: "memory");
|
|
break;
|
|
case 2:
|
|
__asm__ __volatile__(
|
|
"ldh %0, %2\n"
|
|
"sth %1, %2\n"
|
|
: "=&r" (tmp)
|
|
: "r" (x), "m" (*__xg(ptr))
|
|
: "memory");
|
|
break;
|
|
case 4:
|
|
__asm__ __volatile__(
|
|
"ldw %0, %2\n"
|
|
"stw %1, %2\n"
|
|
: "=&r" (tmp)
|
|
: "r" (x), "m" (*__xg(ptr))
|
|
: "memory");
|
|
break;
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
return tmp;
|
|
}
|
|
|
|
#include <asm-generic/cmpxchg.h>
|
|
#include <asm-generic/cmpxchg-local.h>
|
|
|
|
#endif /* _ASM_NIOS2_CMPXCHG_H */
|