[net-next-2.6.git] / arch / sparc / include / asm / backoff.h

#ifndef _SPARC64_BACKOFF_H
#define _SPARC64_BACKOFF_H

#define BACKOFF_LIMIT	(4 * 1024)

#ifdef CONFIG_SMP

#define BACKOFF_SETUP(reg)	\
	mov	1, reg

#define BACKOFF_LABEL(spin_label, continue_label) \
	spin_label

#define BACKOFF_SPIN(reg, tmp, label)	\
	mov	reg, tmp; \
88:	brnz,pt	tmp, 88b; \
	 sub	tmp, 1, tmp; \
	set	BACKOFF_LIMIT, tmp; \
	cmp	reg, tmp; \
	bg,pn	%xcc, label; \
	 nop; \
	ba,pt	%xcc, label; \
	 sllx	reg, 1, reg;

#else

#define BACKOFF_SETUP(reg)

#define BACKOFF_LABEL(spin_label, continue_label) \
	continue_label

#define BACKOFF_SPIN(reg, tmp, label)

#endif

#endif /* _SPARC64_BACKOFF_H */
Commit	Line	Data
a00736e9 SR	1	#ifndef _SPARC64_BACKOFF_H
	2	#define _SPARC64_BACKOFF_H
	3
	4	#define BACKOFF_LIMIT (4 * 1024)
	5
	6	#ifdef CONFIG_SMP
	7
	8	#define BACKOFF_SETUP(reg) \
	9	mov 1, reg
	10
0f58189d DM	11	#define BACKOFF_LABEL(spin_label, continue_label) \
	12	spin_label
	13
a00736e9 SR	14	#define BACKOFF_SPIN(reg, tmp, label) \
	15	mov reg, tmp; \
	16	88: brnz,pt tmp, 88b; \
	17	sub tmp, 1, tmp; \
	18	set BACKOFF_LIMIT, tmp; \
	19	cmp reg, tmp; \
	20	bg,pn %xcc, label; \
	21	nop; \
	22	ba,pt %xcc, label; \
	23	sllx reg, 1, reg;
	24
	25	#else
	26
	27	#define BACKOFF_SETUP(reg)
0f58189d DM	28
	29	#define BACKOFF_LABEL(spin_label, continue_label) \
	30	continue_label
	31
	32	#define BACKOFF_SPIN(reg, tmp, label)
a00736e9 SR	33
	34	#endif
	35
	36	#endif /* _SPARC64_BACKOFF_H */