134 строки
3.2 KiB
C
134 строки
3.2 KiB
C
/*
|
|
* Copyright 2004-2011 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#ifndef __ARCH_BLACKFIN_CMPXCHG__
|
|
#define __ARCH_BLACKFIN_CMPXCHG__
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
asmlinkage unsigned long __raw_xchg_1_asm(volatile void *ptr, unsigned long value);
|
|
asmlinkage unsigned long __raw_xchg_2_asm(volatile void *ptr, unsigned long value);
|
|
asmlinkage unsigned long __raw_xchg_4_asm(volatile void *ptr, unsigned long value);
|
|
asmlinkage unsigned long __raw_cmpxchg_1_asm(volatile void *ptr,
|
|
unsigned long new, unsigned long old);
|
|
asmlinkage unsigned long __raw_cmpxchg_2_asm(volatile void *ptr,
|
|
unsigned long new, unsigned long old);
|
|
asmlinkage unsigned long __raw_cmpxchg_4_asm(volatile void *ptr,
|
|
unsigned long new, unsigned long old);
|
|
|
|
static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
|
|
int size)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
tmp = __raw_xchg_1_asm(ptr, x);
|
|
break;
|
|
case 2:
|
|
tmp = __raw_xchg_2_asm(ptr, x);
|
|
break;
|
|
case 4:
|
|
tmp = __raw_xchg_4_asm(ptr, x);
|
|
break;
|
|
}
|
|
|
|
return tmp;
|
|
}
|
|
|
|
/*
|
|
* Atomic compare and exchange. Compare OLD with MEM, if identical,
|
|
* store NEW in MEM. Return the initial value in MEM. Success is
|
|
* indicated by comparing RETURN with OLD.
|
|
*/
|
|
static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
|
|
unsigned long new, int size)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
tmp = __raw_cmpxchg_1_asm(ptr, new, old);
|
|
break;
|
|
case 2:
|
|
tmp = __raw_cmpxchg_2_asm(ptr, new, old);
|
|
break;
|
|
case 4:
|
|
tmp = __raw_cmpxchg_4_asm(ptr, new, old);
|
|
break;
|
|
}
|
|
|
|
return tmp;
|
|
}
|
|
#define cmpxchg(ptr, o, n) \
|
|
((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
|
|
(unsigned long)(n), sizeof(*(ptr))))
|
|
|
|
#else /* !CONFIG_SMP */
|
|
|
|
#include <mach/blackfin.h>
|
|
#include <asm/irqflags.h>
|
|
|
|
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 = 0;
|
|
unsigned long flags;
|
|
|
|
flags = hard_local_irq_save();
|
|
|
|
switch (size) {
|
|
case 1:
|
|
__asm__ __volatile__
|
|
("%0 = b%2 (z);\n\t"
|
|
"b%2 = %1;\n\t"
|
|
: "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
|
|
break;
|
|
case 2:
|
|
__asm__ __volatile__
|
|
("%0 = w%2 (z);\n\t"
|
|
"w%2 = %1;\n\t"
|
|
: "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
|
|
break;
|
|
case 4:
|
|
__asm__ __volatile__
|
|
("%0 = %2;\n\t"
|
|
"%2 = %1;\n\t"
|
|
: "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
|
|
break;
|
|
}
|
|
hard_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))
|
|
|
|
#define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n))
|
|
#define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n))
|
|
|
|
#endif /* !CONFIG_SMP */
|
|
|
|
#define xchg(ptr, x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
|
|
#define tas(ptr) ((void)xchg((ptr), 1))
|
|
|
|
#endif /* __ARCH_BLACKFIN_CMPXCHG__ */
|