1/*
 2 * Copyright IBM Corp. 1999, 2009
 3 *
 4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 5 */
 6
 7#ifndef __ASM_SWITCH_TO_H
 8#define __ASM_SWITCH_TO_H
 9
10#include <linux/thread_info.h>
11#include <asm/fpu/api.h>
12#include <asm/ptrace.h>
13
14extern struct task_struct *__switch_to(void *, void *);
15extern void update_cr_regs(struct task_struct *task);
16
17static inline void save_access_regs(unsigned int *acrs)
18{
19	typedef struct { int _[NUM_ACRS]; } acrstype;
20
21	asm volatile("stam 0,15,%0" : "=Q" (*(acrstype *)acrs));
22}
23
24static inline void restore_access_regs(unsigned int *acrs)
25{
26	typedef struct { int _[NUM_ACRS]; } acrstype;
27
28	asm volatile("lam 0,15,%0" : : "Q" (*(acrstype *)acrs));
29}
30
31#define switch_to(prev,next,last) do {					\
32	if (prev->mm) {							\
33		save_fpu_regs();					\
34		save_access_regs(&prev->thread.acrs[0]);		\
35		save_ri_cb(prev->thread.ri_cb);				\
36	}								\
37	if (next->mm) {							\
38		update_cr_regs(next);					\
39		set_cpu_flag(CIF_FPU);					\
40		restore_access_regs(&next->thread.acrs[0]);		\
41		restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb);	\
42	}								\
43	prev = __switch_to(prev,next);					\
44} while (0)
45
46#endif /* __ASM_SWITCH_TO_H */