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