71995e4d00
This patch adds support for thread creation and context switching. Signed-off-by: Ley Foon Tan <lftan@altera.com>
31 lines
866 B
C
31 lines
866 B
C
/*
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* Copyright (C) 2004 Microtronix Datacom Ltd.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_NIOS2_SWITCH_TO_H
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#define _ASM_NIOS2_SWITCH_TO_H
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/*
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* switch_to(n) should switch tasks to task ptr, first checking that
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* ptr isn't the current task, in which case it does nothing. This
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* also clears the TS-flag if the task we switched to has used the
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* math co-processor latest.
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*/
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#define switch_to(prev, next, last) \
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{ \
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void *_last; \
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__asm__ __volatile__ ( \
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"mov r4, %1\n" \
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"mov r5, %2\n" \
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"call resume\n" \
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"mov %0,r4\n" \
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: "=r" (_last) \
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: "r" (prev), "r" (next) \
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: "r4", "r5", "r7", "r8", "ra"); \
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(last) = _last; \
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}
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#endif /* _ASM_NIOS2_SWITCH_TO_H */
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