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31 lines
866 B
31 lines
866 B
/* |
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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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