/* 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 */