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- /* MN10300 task switching definitions
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
- #ifndef _ASM_SWITCH_TO_H
- #define _ASM_SWITCH_TO_H
- #include <asm/barrier.h>
- struct task_struct;
- struct thread_struct;
- #if !defined(CONFIG_LAZY_SAVE_FPU)
- struct fpu_state_struct;
- extern asmlinkage void fpu_save(struct fpu_state_struct *);
- #define switch_fpu(prev, next) \
- do { \
- if ((prev)->thread.fpu_flags & THREAD_HAS_FPU) { \
- (prev)->thread.fpu_flags &= ~THREAD_HAS_FPU; \
- (prev)->thread.uregs->epsw &= ~EPSW_FE; \
- fpu_save(&(prev)->thread.fpu_state); \
- } \
- } while (0)
- #else
- #define switch_fpu(prev, next) do {} while (0)
- #endif
- /* context switching is now performed out-of-line in switch_to.S */
- extern asmlinkage
- struct task_struct *__switch_to(struct thread_struct *prev,
- struct thread_struct *next,
- struct task_struct *prev_task);
- #define switch_to(prev, next, last) \
- do { \
- switch_fpu(prev, next); \
- current->thread.wchan = (u_long) __builtin_return_address(0); \
- (last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \
- mb(); \
- current->thread.wchan = 0; \
- } while (0)
- #endif /* _ASM_SWITCH_TO_H */
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