86 строки
2.3 KiB
C
86 строки
2.3 KiB
C
/* MN10300 FPU definitions
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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* Derived from include/asm-i386/i387.h: Copyright (C) 1994 Linus Torvalds
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_FPU_H
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#define _ASM_FPU_H
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#include <asm/processor.h>
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#include <asm/sigcontext.h>
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#include <asm/user.h>
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#ifdef __KERNEL__
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/* the task that owns the FPU state */
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extern struct task_struct *fpu_state_owner;
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#define set_using_fpu(tsk) \
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do { \
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(tsk)->thread.fpu_flags |= THREAD_USING_FPU; \
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} while (0)
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#define clear_using_fpu(tsk) \
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do { \
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(tsk)->thread.fpu_flags &= ~THREAD_USING_FPU; \
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} while (0)
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#define is_using_fpu(tsk) ((tsk)->thread.fpu_flags & THREAD_USING_FPU)
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#define unlazy_fpu(tsk) \
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do { \
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preempt_disable(); \
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if (fpu_state_owner == (tsk)) \
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fpu_save(&tsk->thread.fpu_state); \
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preempt_enable(); \
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} while (0)
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#define exit_fpu() \
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do { \
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struct task_struct *__tsk = current; \
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preempt_disable(); \
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if (fpu_state_owner == __tsk) \
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fpu_state_owner = NULL; \
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preempt_enable(); \
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} while (0)
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#define flush_fpu() \
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do { \
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struct task_struct *__tsk = current; \
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preempt_disable(); \
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if (fpu_state_owner == __tsk) { \
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fpu_state_owner = NULL; \
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__tsk->thread.uregs->epsw &= ~EPSW_FE; \
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} \
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preempt_enable(); \
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clear_using_fpu(__tsk); \
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} while (0)
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extern asmlinkage void fpu_init_state(void);
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extern asmlinkage void fpu_kill_state(struct task_struct *);
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extern asmlinkage void fpu_disabled(struct pt_regs *, enum exception_code);
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extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code);
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#ifdef CONFIG_FPU
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extern asmlinkage void fpu_save(struct fpu_state_struct *);
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extern asmlinkage void fpu_restore(struct fpu_state_struct *);
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#else
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#define fpu_save(a)
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#define fpu_restore(a)
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#endif /* CONFIG_FPU */
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/*
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* signal frame handlers
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*/
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extern int fpu_setup_sigcontext(struct fpucontext *buf);
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extern int fpu_restore_sigcontext(struct fpucontext *buf);
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#endif /* __KERNEL__ */
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#endif /* _ASM_FPU_H */
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