forked from mirrors/linux
5b2189ab6e
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>
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_ARC_SWITCH_TO_H
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#define _ASM_ARC_SWITCH_TO_H
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#ifndef __ASSEMBLY__
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#include <linux/sched.h>
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#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
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extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
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#define ARC_FPU_PREV(p, n) fpu_save_restore(p, n)
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#define ARC_FPU_NEXT(t)
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#else
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#define ARC_FPU_PREV(p, n)
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#define ARC_FPU_NEXT(n)
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#endif /* !CONFIG_ARC_FPU_SAVE_RESTORE */
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#ifdef CONFIG_ARC_PLAT_EZNPS
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extern void dp_save_restore(struct task_struct *p, struct task_struct *n);
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#define ARC_EZNPS_DP_PREV(p, n) dp_save_restore(p, n)
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#else
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#define ARC_EZNPS_DP_PREV(p, n)
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#endif /* !CONFIG_ARC_PLAT_EZNPS */
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struct task_struct *__switch_to(struct task_struct *p, struct task_struct *n);
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#define switch_to(prev, next, last) \
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do { \
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ARC_EZNPS_DP_PREV(prev, next); \
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ARC_FPU_PREV(prev, next); \
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last = __switch_to(prev, next);\
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ARC_FPU_NEXT(next); \
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mb(); \
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} while (0)
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#endif
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#endif
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