1 /* MN10300 FPU definitions
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
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.
17 #include <linux/sched.h>
18 #include <asm/exceptions.h>
19 #include <asm/sigcontext.h>
23 extern asmlinkage void fpu_disabled(void);
27 #ifdef CONFIG_LAZY_SAVE_FPU
28 /* the task that currently owns the FPU state */
29 extern struct task_struct *fpu_state_owner;
32 #if (THREAD_USING_FPU & ~0xff)
33 #error THREAD_USING_FPU must be smaller than 0x100.
36 static inline void set_using_fpu(struct task_struct *tsk)
41 : "i"(THREAD_USING_FPU), "a"(&tsk->thread.fpu_flags)
45 static inline void clear_using_fpu(struct task_struct *tsk)
50 : "i"(THREAD_USING_FPU), "a"(&tsk->thread.fpu_flags)
54 #define is_using_fpu(tsk) ((tsk)->thread.fpu_flags & THREAD_USING_FPU)
56 extern asmlinkage void fpu_kill_state(struct task_struct *);
57 extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code);
58 extern asmlinkage void fpu_init_state(void);
59 extern asmlinkage void fpu_save(struct fpu_state_struct *);
60 extern int fpu_setup_sigcontext(struct fpucontext *buf);
61 extern int fpu_restore_sigcontext(struct fpucontext *buf);
63 static inline void unlazy_fpu(struct task_struct *tsk)
66 #ifndef CONFIG_LAZY_SAVE_FPU
67 if (tsk->thread.fpu_flags & THREAD_HAS_FPU) {
68 fpu_save(&tsk->thread.fpu_state);
69 tsk->thread.fpu_flags &= ~THREAD_HAS_FPU;
70 tsk->thread.uregs->epsw &= ~EPSW_FE;
73 if (fpu_state_owner == tsk)
74 fpu_save(&tsk->thread.fpu_state);
79 static inline void exit_fpu(struct task_struct *tsk)
81 #ifdef CONFIG_LAZY_SAVE_FPU
83 if (fpu_state_owner == tsk)
84 fpu_state_owner = NULL;
89 static inline void flush_fpu(void)
91 struct task_struct *tsk = current;
94 #ifndef CONFIG_LAZY_SAVE_FPU
95 if (tsk->thread.fpu_flags & THREAD_HAS_FPU) {
96 tsk->thread.fpu_flags &= ~THREAD_HAS_FPU;
97 tsk->thread.uregs->epsw &= ~EPSW_FE;
100 if (fpu_state_owner == tsk) {
101 fpu_state_owner = NULL;
102 tsk->thread.uregs->epsw &= ~EPSW_FE;
106 clear_using_fpu(tsk);
109 #else /* CONFIG_FPU */
112 void unexpected_fpu_exception(struct pt_regs *, enum exception_code);
113 #define fpu_exception unexpected_fpu_exception
116 struct fpu_state_struct;
117 static inline bool is_using_fpu(struct task_struct *tsk) { return false; }
118 static inline void set_using_fpu(struct task_struct *tsk) {}
119 static inline void clear_using_fpu(struct task_struct *tsk) {}
120 static inline void fpu_init_state(void) {}
121 static inline void fpu_save(struct fpu_state_struct *s) {}
122 static inline void fpu_kill_state(struct task_struct *tsk) {}
123 static inline void unlazy_fpu(struct task_struct *tsk) {}
124 static inline void exit_fpu(struct task_struct *tsk) {}
125 static inline void flush_fpu(void) {}
126 static inline int fpu_setup_sigcontext(struct fpucontext *buf) { return 0; }
127 static inline int fpu_restore_sigcontext(struct fpucontext *buf) { return 0; }
128 #endif /* CONFIG_FPU */
130 #endif /* __KERNEL__ */
131 #endif /* !__ASSEMBLY__ */
132 #endif /* _ASM_FPU_H */