mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-01 17:10:11 +00:00
95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
/*
|
|
* PowerPC atomic operations
|
|
*/
|
|
|
|
#ifndef _ASM_PPC_ATOMIC_H_
|
|
#define _ASM_PPC_ATOMIC_H_
|
|
|
|
#include <linux/config.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
typedef struct { volatile int counter; } atomic_t;
|
|
#else
|
|
typedef struct { int counter; } atomic_t;
|
|
#endif
|
|
|
|
#define ATOMIC_INIT(i) { (i) }
|
|
|
|
#define atomic_read(v) ((v)->counter)
|
|
#define atomic_set(v,i) (((v)->counter) = (i))
|
|
|
|
extern void atomic_clear_mask(unsigned long mask, unsigned long *addr);
|
|
extern void atomic_set_mask(unsigned long mask, unsigned long *addr);
|
|
|
|
extern __inline__ int atomic_add_return(int a, atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__("\n\
|
|
1: lwarx %0,0,%3\n\
|
|
add %0,%2,%0\n\
|
|
stwcx. %0,0,%3\n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (*v)
|
|
: "r" (a), "r" (v), "m" (*v)
|
|
: "cc");
|
|
|
|
return t;
|
|
}
|
|
|
|
extern __inline__ int atomic_sub_return(int a, atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__("\n\
|
|
1: lwarx %0,0,%3\n\
|
|
subf %0,%2,%0\n\
|
|
stwcx. %0,0,%3\n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (*v)
|
|
: "r" (a), "r" (v), "m" (*v)
|
|
: "cc");
|
|
|
|
return t;
|
|
}
|
|
|
|
extern __inline__ int atomic_inc_return(atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__("\n\
|
|
1: lwarx %0,0,%2\n\
|
|
addic %0,%0,1\n\
|
|
stwcx. %0,0,%2\n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (*v)
|
|
: "r" (v), "m" (*v)
|
|
: "cc");
|
|
|
|
return t;
|
|
}
|
|
|
|
extern __inline__ int atomic_dec_return(atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__("\n\
|
|
1: lwarx %0,0,%2\n\
|
|
addic %0,%0,-1\n\
|
|
stwcx. %0,0,%2\n\
|
|
bne 1b"
|
|
: "=&r" (t), "=m" (*v)
|
|
: "r" (v), "m" (*v)
|
|
: "cc");
|
|
|
|
return t;
|
|
}
|
|
|
|
#define atomic_add(a, v) ((void) atomic_add_return((a), (v)))
|
|
#define atomic_sub(a, v) ((void) atomic_sub_return((a), (v)))
|
|
#define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
|
|
#define atomic_inc(v) ((void) atomic_inc_return((v)))
|
|
#define atomic_dec(v) ((void) atomic_dec_return((v)))
|
|
#define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)
|
|
|
|
#endif /* _ASM_PPC_ATOMIC_H_ */
|