b1a154dbf9
Disintegrate asm/system.h for CRIS. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> cc: linux-cris-kernel@axis.com
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
#ifndef __ASM_CRIS_CMPXCHG__
|
|
#define __ASM_CRIS_CMPXCHG__
|
|
|
|
#include <linux/irqflags.h>
|
|
|
|
static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
|
|
{
|
|
/* since Etrax doesn't have any atomic xchg instructions, we need to disable
|
|
irq's (if enabled) and do it with move.d's */
|
|
unsigned long flags,temp;
|
|
local_irq_save(flags); /* save flags, including irq enable bit and shut off irqs */
|
|
switch (size) {
|
|
case 1:
|
|
*((unsigned char *)&temp) = x;
|
|
x = *(unsigned char *)ptr;
|
|
*(unsigned char *)ptr = *((unsigned char *)&temp);
|
|
break;
|
|
case 2:
|
|
*((unsigned short *)&temp) = x;
|
|
x = *(unsigned short *)ptr;
|
|
*(unsigned short *)ptr = *((unsigned short *)&temp);
|
|
break;
|
|
case 4:
|
|
temp = x;
|
|
x = *(unsigned long *)ptr;
|
|
*(unsigned long *)ptr = temp;
|
|
break;
|
|
}
|
|
local_irq_restore(flags); /* restore irq enable bit */
|
|
return x;
|
|
}
|
|
|
|
#define xchg(ptr,x) \
|
|
((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
|
|
|
|
#define tas(ptr) (xchg((ptr),1))
|
|
|
|
#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
|
|
|
|
#endif /* __ASM_CRIS_CMPXCHG__ */
|