linux_dsm_epyc7002/arch/arc/include/asm/switch_to.h
Noam Camus 5b2189ab6e ARC: [plat-eznps] handle extra aux regs #1: save/restore on context switch
save EFLAGS, and GPA1 auxiliary registers during context switch,
since they may be changed by the new task in kernel mode, while using atomic
ops e.g. cmpxchg.

Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2017-08-28 15:17:36 -07:00

51 lines
1.2 KiB
C

/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ASM_ARC_SWITCH_TO_H
#define _ASM_ARC_SWITCH_TO_H
#ifndef __ASSEMBLY__
#include <linux/sched.h>
#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
#define ARC_FPU_PREV(p, n) fpu_save_restore(p, n)
#define ARC_FPU_NEXT(t)
#else
#define ARC_FPU_PREV(p, n)
#define ARC_FPU_NEXT(n)
#endif /* !CONFIG_ARC_FPU_SAVE_RESTORE */
#ifdef CONFIG_ARC_PLAT_EZNPS
extern void dp_save_restore(struct task_struct *p, struct task_struct *n);
#define ARC_EZNPS_DP_PREV(p, n) dp_save_restore(p, n)
#else
#define ARC_EZNPS_DP_PREV(p, n)
#endif /* !CONFIG_ARC_PLAT_EZNPS */
struct task_struct *__switch_to(struct task_struct *p, struct task_struct *n);
#define switch_to(prev, next, last) \
do { \
ARC_EZNPS_DP_PREV(prev, next); \
ARC_FPU_PREV(prev, next); \
last = __switch_to(prev, next);\
ARC_FPU_NEXT(next); \
mb(); \
} while (0)
#endif
#endif