| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1 | /* MN10300 FPU definitions |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * Derived from include/asm-i386/i387.h: Copyright (C) 1994 Linus Torvalds |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public Licence |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the Licence, or (at your option) any later version. |
| 11 | */ |
| 12 | #ifndef _ASM_FPU_H |
| 13 | #define _ASM_FPU_H |
| 14 | |
| 15 | #include <asm/processor.h> |
| 16 | #include <asm/sigcontext.h> |
| 17 | #include <asm/user.h> |
| 18 | |
| 19 | #ifdef __KERNEL__ |
| 20 | |
| 21 | /* the task that owns the FPU state */ |
| 22 | extern struct task_struct *fpu_state_owner; |
| 23 | |
| 24 | #define set_using_fpu(tsk) \ |
| 25 | do { \ |
| 26 | (tsk)->thread.fpu_flags |= THREAD_USING_FPU; \ |
| 27 | } while (0) |
| 28 | |
| 29 | #define clear_using_fpu(tsk) \ |
| 30 | do { \ |
| 31 | (tsk)->thread.fpu_flags &= ~THREAD_USING_FPU; \ |
| 32 | } while (0) |
| 33 | |
| 34 | #define is_using_fpu(tsk) ((tsk)->thread.fpu_flags & THREAD_USING_FPU) |
| 35 | |
| 36 | #define unlazy_fpu(tsk) \ |
| 37 | do { \ |
| 38 | preempt_disable(); \ |
| 39 | if (fpu_state_owner == (tsk)) \ |
| 40 | fpu_save(&tsk->thread.fpu_state); \ |
| 41 | preempt_enable(); \ |
| 42 | } while (0) |
| 43 | |
| 44 | #define exit_fpu() \ |
| 45 | do { \ |
| 46 | struct task_struct *__tsk = current; \ |
| 47 | preempt_disable(); \ |
| 48 | if (fpu_state_owner == __tsk) \ |
| 49 | fpu_state_owner = NULL; \ |
| 50 | preempt_enable(); \ |
| 51 | } while (0) |
| 52 | |
| 53 | #define flush_fpu() \ |
| 54 | do { \ |
| 55 | struct task_struct *__tsk = current; \ |
| 56 | preempt_disable(); \ |
| 57 | if (fpu_state_owner == __tsk) { \ |
| 58 | fpu_state_owner = NULL; \ |
| 59 | __tsk->thread.uregs->epsw &= ~EPSW_FE; \ |
| 60 | } \ |
| 61 | preempt_enable(); \ |
| 62 | clear_using_fpu(__tsk); \ |
| 63 | } while (0) |
| 64 | |
| 65 | extern asmlinkage void fpu_init_state(void); |
| 66 | extern asmlinkage void fpu_kill_state(struct task_struct *); |
| 67 | extern asmlinkage void fpu_disabled(struct pt_regs *, enum exception_code); |
| 68 | extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code); |
| 69 | |
| 70 | #ifdef CONFIG_FPU |
| 71 | extern asmlinkage void fpu_save(struct fpu_state_struct *); |
| 72 | extern asmlinkage void fpu_restore(struct fpu_state_struct *); |
| 73 | #else |
| 74 | #define fpu_save(a) |
| 75 | #define fpu_restore(a) |
| 76 | #endif /* CONFIG_FPU */ |
| 77 | |
| 78 | /* |
| 79 | * signal frame handlers |
| 80 | */ |
| 81 | extern int fpu_setup_sigcontext(struct fpucontext *buf); |
| 82 | extern int fpu_restore_sigcontext(struct fpucontext *buf); |
| 83 | |
| 84 | #endif /* __KERNEL__ */ |
| 85 | #endif /* _ASM_FPU_H */ |