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/* MN10300 FPU definitions
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
* Derived from include/asm-i386/i387.h: Copyright (C) 1994 Linus Torvalds
*
* 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_FPU_H
#define _ASM_FPU_H
#include <asm/processor.h>
#include <asm/sigcontext.h>
#include <asm/user.h>
#ifdef __KERNEL__
/* the task that owns the FPU state */
extern struct task_struct *fpu_state_owner;
#define set_using_fpu(tsk) \
do { \
(tsk)->thread.fpu_flags |= THREAD_USING_FPU; \
} while (0)
#define clear_using_fpu(tsk) \
do { \
(tsk)->thread.fpu_flags &= ~THREAD_USING_FPU; \
} while (0)
#define is_using_fpu(tsk) ((tsk)->thread.fpu_flags & THREAD_USING_FPU)
#define unlazy_fpu(tsk) \
do { \
preempt_disable(); \
if (fpu_state_owner == (tsk)) \
fpu_save(&tsk->thread.fpu_state); \
preempt_enable(); \
} while (0)
#define exit_fpu() \
do { \
struct task_struct *__tsk = current; \
preempt_disable(); \
if (fpu_state_owner == __tsk) \
fpu_state_owner = NULL; \
preempt_enable(); \
} while (0)
#define flush_fpu() \
do { \
struct task_struct *__tsk = current; \
preempt_disable(); \
if (fpu_state_owner == __tsk) { \
fpu_state_owner = NULL; \
__tsk->thread.uregs->epsw &= ~EPSW_FE; \
} \
preempt_enable(); \
clear_using_fpu(__tsk); \
} while (0)
extern asmlinkage void fpu_init_state(void);
extern asmlinkage void fpu_kill_state(struct task_struct *);
extern asmlinkage void fpu_disabled(struct pt_regs *, enum exception_code);
extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code);
#ifdef CONFIG_FPU
extern asmlinkage void fpu_save(struct fpu_state_struct *);
extern asmlinkage void fpu_restore(struct fpu_state_struct *);
#else
#define fpu_save(a)
#define fpu_restore(a)
#endif /* CONFIG_FPU */
/*
* signal frame handlers
*/
extern int fpu_setup_sigcontext(struct fpucontext *buf);
extern int fpu_restore_sigcontext(struct fpucontext *buf);
#endif /* __KERNEL__ */
#endif /* _ASM_FPU_H */
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