1 /* 2 * Copyright (C) 2004 Microtronix Datacom Ltd. 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 */ 8 #ifndef _ASM_NIOS2_SWITCH_TO_H 9 #define _ASM_NIOS2_SWITCH_TO_H 10 11 /* 12 * switch_to(n) should switch tasks to task ptr, first checking that 13 * ptr isn't the current task, in which case it does nothing. This 14 * also clears the TS-flag if the task we switched to has used the 15 * math co-processor latest. 16 */ 17 #define switch_to(prev, next, last) \ 18 { \ 19 void *_last; \ 20 __asm__ __volatile__ ( \ 21 "mov r4, %1\n" \ 22 "mov r5, %2\n" \ 23 "call resume\n" \ 24 "mov %0,r4\n" \ 25 : "=r" (_last) \ 26 : "r" (prev), "r" (next) \ 27 : "r4", "r5", "r7", "r8", "ra"); \ 28 (last) = _last; \ 29 } 30 31 #endif /* _ASM_NIOS2_SWITCH_TO_H */ 32