forked from Minki/linux
71995e4d00
This patch adds support for thread creation and context switching. Signed-off-by: Ley Foon Tan <lftan@altera.com>
32 lines
866 B
C
32 lines
866 B
C
/*
|
|
* 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 */
|