| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 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 */ |