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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 */