Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6] / include / asm-mn10300 / fpu.h
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 */