mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
ffbf670f5c
add atomic_xchg() to all the architectures. Needed by the new mutex code. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@infradead.org>
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
#ifndef __ARCH_M68KNOMMU_ATOMIC__
|
|
#define __ARCH_M68KNOMMU_ATOMIC__
|
|
|
|
#include <asm/system.h> /* local_irq_XXX() */
|
|
|
|
/*
|
|
* Atomic operations that C can't guarantee us. Useful for
|
|
* resource counting etc..
|
|
*/
|
|
|
|
/*
|
|
* We do not have SMP m68k systems, so we don't have to deal with that.
|
|
*/
|
|
|
|
typedef struct { int counter; } atomic_t;
|
|
#define ATOMIC_INIT(i) { (i) }
|
|
|
|
#define atomic_read(v) ((v)->counter)
|
|
#define atomic_set(v, i) (((v)->counter) = i)
|
|
|
|
static __inline__ void atomic_add(int i, atomic_t *v)
|
|
{
|
|
#ifdef CONFIG_COLDFIRE
|
|
__asm__ __volatile__("addl %1,%0" : "+m" (*v) : "d" (i));
|
|
#else
|
|
__asm__ __volatile__("addl %1,%0" : "+m" (*v) : "di" (i));
|
|
#endif
|
|
}
|
|
|
|
static __inline__ void atomic_sub(int i, atomic_t *v)
|
|
{
|
|
#ifdef CONFIG_COLDFIRE
|
|
__asm__ __volatile__("subl %1,%0" : "+m" (*v) : "d" (i));
|
|
#else
|
|
__asm__ __volatile__("subl %1,%0" : "+m" (*v) : "di" (i));
|
|
#endif
|
|
}
|
|
|
|
static __inline__ int atomic_sub_and_test(int i, atomic_t * v)
|
|
{
|
|
char c;
|
|
#ifdef CONFIG_COLDFIRE
|
|
__asm__ __volatile__("subl %2,%1; seq %0"
|
|
: "=d" (c), "+m" (*v)
|
|
: "d" (i));
|
|
#else
|
|
__asm__ __volatile__("subl %2,%1; seq %0"
|
|
: "=d" (c), "+m" (*v)
|
|
: "di" (i));
|
|
#endif
|
|
return c != 0;
|
|
}
|
|
|
|
static __inline__ void atomic_inc(volatile atomic_t *v)
|
|
{
|
|
__asm__ __volatile__("addql #1,%0" : "+m" (*v));
|
|
}
|
|
|
|
/*
|
|
* atomic_inc_and_test - increment and test
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically increments @v by 1
|
|
* and returns true if the result is zero, or false for all
|
|
* other cases.
|
|
*/
|
|
|
|
static __inline__ int atomic_inc_and_test(volatile atomic_t *v)
|
|
{
|
|
char c;
|
|
__asm__ __volatile__("addql #1,%1; seq %0" : "=d" (c), "+m" (*v));
|
|
return c != 0;
|
|
}
|
|
|
|
static __inline__ void atomic_dec(volatile atomic_t *v)
|
|
{
|
|
__asm__ __volatile__("subql #1,%0" : "+m" (*v));
|
|
}
|
|
|
|
static __inline__ int atomic_dec_and_test(volatile atomic_t *v)
|
|
{
|
|
char c;
|
|
__asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "+m" (*v));
|
|
return c != 0;
|
|
}
|
|
|
|
static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
|
|
{
|
|
__asm__ __volatile__("andl %1,%0" : "+m" (*v) : "id" (~(mask)));
|
|
}
|
|
|
|
static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
|
|
{
|
|
__asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask));
|
|
}
|
|
|
|
/* Atomic operations are already serializing */
|
|
#define smp_mb__before_atomic_dec() barrier()
|
|
#define smp_mb__after_atomic_dec() barrier()
|
|
#define smp_mb__before_atomic_inc() barrier()
|
|
#define smp_mb__after_atomic_inc() barrier()
|
|
|
|
static inline int atomic_add_return(int i, atomic_t * v)
|
|
{
|
|
unsigned long temp, flags;
|
|
|
|
local_irq_save(flags);
|
|
temp = *(long *)v;
|
|
temp += i;
|
|
*(long *)v = temp;
|
|
local_irq_restore(flags);
|
|
|
|
return temp;
|
|
}
|
|
|
|
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
|
|
|
|
static inline int atomic_sub_return(int i, atomic_t * v)
|
|
{
|
|
unsigned long temp, flags;
|
|
|
|
local_irq_save(flags);
|
|
temp = *(long *)v;
|
|
temp -= i;
|
|
*(long *)v = temp;
|
|
local_irq_restore(flags);
|
|
|
|
return temp;
|
|
}
|
|
|
|
#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
|
|
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
|
|
|
|
#define atomic_add_unless(v, a, u) \
|
|
({ \
|
|
int c, old; \
|
|
c = atomic_read(v); \
|
|
while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
|
|
c = old; \
|
|
c != (u); \
|
|
})
|
|
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
|
|
|
|
#define atomic_dec_return(v) atomic_sub_return(1,(v))
|
|
#define atomic_inc_return(v) atomic_add_return(1,(v))
|
|
|
|
#include <asm-generic/atomic.h>
|
|
#endif /* __ARCH_M68KNOMMU_ATOMIC __ */
|