[linux-2.6-block.git] / arch / s390 / include / asm / switch_to.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright IBM Corp. 1999, 2009
 *
 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 */

#ifndef __ASM_SWITCH_TO_H
#define __ASM_SWITCH_TO_H

#include <linux/thread_info.h>
#include <asm/fpu/api.h>
#include <asm/ptrace.h>
#include <asm/guarded_storage.h>

extern struct task_struct *__switch_to(void *, void *);
extern void update_cr_regs(struct task_struct *task);

static inline void save_access_regs(unsigned int *acrs)
{
	typedef struct { int _[NUM_ACRS]; } acrstype;

	asm volatile("stam 0,15,%0" : "=Q" (*(acrstype *)acrs));
}

static inline void restore_access_regs(unsigned int *acrs)
{
	typedef struct { int _[NUM_ACRS]; } acrstype;

	asm volatile("lam 0,15,%0" : : "Q" (*(acrstype *)acrs));
}

#define switch_to(prev,next,last) do {					\
	if (prev->mm) {							\
		save_fpu_regs();					\
		save_access_regs(&prev->thread.acrs[0]);		\
		save_ri_cb(prev->thread.ri_cb);				\
		save_gs_cb(prev->thread.gs_cb);				\
	}								\
	if (next->mm) {							\
		update_cr_regs(next);					\
		set_cpu_flag(CIF_FPU);					\
		restore_access_regs(&next->thread.acrs[0]);		\
		restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb);	\
		restore_gs_cb(next->thread.gs_cb);			\
	}								\
	prev = __switch_to(prev,next);					\
} while (0)

#endif /* __ASM_SWITCH_TO_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
a0616cde DH	2	/*
	3	* Copyright IBM Corp. 1999, 2009
	4	*
	5	* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
	6	*/
	7
	8	#ifndef __ASM_SWITCH_TO_H
	9	#define __ASM_SWITCH_TO_H
	10
	11	#include <linux/thread_info.h>
b0753902	12	#include <asm/fpu/api.h>
bee5c286	13	#include <asm/ptrace.h>
916cda1a	14	#include <asm/guarded_storage.h>
a0616cde DH	15
a0616cde DH	16	extern struct task_struct __switch_to(void , void *);
64597f9d	17	extern void update_cr_regs(struct task_struct *task);
a0616cde	18
a0616cde DH	19	static inline void save_access_regs(unsigned int *acrs)
a0616cde DH	20	{
bee5c286 HC	21	typedef struct { int _[NUM_ACRS]; } acrstype;
	22
	23	asm volatile("stam 0,15,%0" : "=Q" ((acrstype )acrs));
a0616cde DH	24	}
	25
	26	static inline void restore_access_regs(unsigned int *acrs)
	27	{
bee5c286 HC	28	typedef struct { int _[NUM_ACRS]; } acrstype;
	29
	30	asm volatile("lam 0,15,%0" : : "Q" ((acrstype )acrs));
a0616cde DH	31	}
	32
	33	#define switch_to(prev,next,last) do { \
	34	if (prev->mm) { \
d0164ee2	35	save_fpu_regs(); \
a0616cde	36	save_access_regs(&prev->thread.acrs[0]); \
e4b8b3f3	37	save_ri_cb(prev->thread.ri_cb); \
916cda1a	38	save_gs_cb(prev->thread.gs_cb); \
a0616cde DH	39	} \
a0616cde DH	40	if (next->mm) { \
80703617	41	update_cr_regs(next); \
9977e886	42	set_cpu_flag(CIF_FPU); \
a0616cde	43	restore_access_regs(&next->thread.acrs[0]); \
e4b8b3f3	44	restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
916cda1a	45	restore_gs_cb(next->thread.gs_cb); \
a0616cde DH	46	} \
	47	prev = __switch_to(prev,next); \
	48	} while (0)
	49
a0616cde	50	#endif /* __ASM_SWITCH_TO_H */