Revert "Remove unused define"

[fio.git] / arch / arch-ppc.h

#ifndef ARCH_PPC_H
#define ARCH_PPH_H

#define ARCH	(arch_ppc)

#ifndef __NR_ioprio_set
#define __NR_ioprio_set		273
#define __NR_ioprio_get		274
#endif

#ifndef __NR_fadvise64
#define __NR_fadvise64		233
#endif

#ifndef __NR_sys_splice
#define __NR_sys_splice		283
#define __NR_sys_tee		284
#define __NR_sys_vmsplice	285
#endif

#define nop	do { } while (0)

#ifdef __powerpc64__
#define read_barrier()	__asm__ __volatile__ ("lwsync" : : : "memory")
#else
#define read_barrier()	__asm__ __volatile__ ("sync" : : : "memory")
#endif

#define write_barrier()	__asm__ __volatile__ ("sync" : : : "memory")

static inline int __ilog2(unsigned long bitmask)
{
	int lz;

	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (bitmask));
	return 31 - lz;
}

static inline int arch_ffz(unsigned long bitmask)
{
	if ((bitmask = ~bitmask) == 0)
		return 32;
	return  __ilog2(bitmask & -bitmask);
}
#define ARCH_HAVE_FFZ

typedef struct {
	volatile unsigned int lock;
} spinlock_t;

static inline void spin_trylock(spinlock_t *lock)
{
	unsigned long tmp;

	__asm__ __volatile__(
		"1:     lwarx           %0,0,%2\n\
		cmpwi           0,%0,0\n\
		bne-            2f\n\
		stwcx.          1,0,%2\n\
		bne-            1b\n\
		isync\n\
		2:"     : "=&r" (tmp)
		: (&lock->lock)
		: "cr0", "memory");

	return tmp;
}

static inline void spin_lock(spinlock_t *lock)
{
	while (spin_trylock(lock))
		;
}

static inline void spin_unlock(spinlock_t *lock)
{
	read_barrier();
	lock->lock = 0;
}

#endif