67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/*
|
|
* Port on Texas Instruments TMS320C6x architecture
|
|
*
|
|
* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
|
|
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef _ASM_C6X_CMPXCHG_H
|
|
#define _ASM_C6X_CMPXCHG_H
|
|
|
|
#include <linux/irqflags.h>
|
|
|
|
/*
|
|
* Misc. functions
|
|
*/
|
|
static inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size)
|
|
{
|
|
unsigned int tmp;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
|
|
switch (size) {
|
|
case 1:
|
|
tmp = 0;
|
|
tmp = *((unsigned char *) ptr);
|
|
*((unsigned char *) ptr) = (unsigned char) x;
|
|
break;
|
|
case 2:
|
|
tmp = 0;
|
|
tmp = *((unsigned short *) ptr);
|
|
*((unsigned short *) ptr) = x;
|
|
break;
|
|
case 4:
|
|
tmp = 0;
|
|
tmp = *((unsigned int *) ptr);
|
|
*((unsigned int *) ptr) = x;
|
|
break;
|
|
}
|
|
local_irq_restore(flags);
|
|
return tmp;
|
|
}
|
|
|
|
#define xchg(ptr, x) \
|
|
((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \
|
|
sizeof(*(ptr))))
|
|
|
|
#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))
|
|
|
|
#include <asm-generic/cmpxchg.h>
|
|
|
|
#endif /* _ASM_C6X_CMPXCHG_H */
|