2 * Copyright (C) 2002 MontaVista Software Inc.
3 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
13 #include <linux/sched.h>
14 #include <linux/thread_info.h>
15 #include <linux/bitops.h>
17 #include <asm/mipsregs.h>
19 #include <asm/cpu-features.h>
20 #include <asm/hazards.h>
21 #include <asm/processor.h>
22 #include <asm/current.h>
24 #ifdef CONFIG_MIPS_MT_FPAFF
25 #include <asm/mips_mt.h>
31 extern asmlinkage
int (*save_fp_context
)(struct sigcontext __user
*sc
);
32 extern asmlinkage
int (*restore_fp_context
)(struct sigcontext __user
*sc
);
34 extern asmlinkage
int (*save_fp_context32
)(struct sigcontext32 __user
*sc
);
35 extern asmlinkage
int (*restore_fp_context32
)(struct sigcontext32 __user
*sc
);
37 extern void fpu_emulator_init_fpu(void);
38 extern int fpu_emulator_save_context(struct sigcontext __user
*sc
);
39 extern int fpu_emulator_restore_context(struct sigcontext __user
*sc
);
40 extern void _init_fpu(void);
41 extern void _save_fp(struct task_struct
*);
42 extern void _restore_fp(struct task_struct
*);
44 #define __enable_fpu() \
46 set_c0_status(ST0_CU1); \
47 enable_fpu_hazard(); \
50 #define __disable_fpu() \
52 clear_c0_status(ST0_CU1); \
53 disable_fpu_hazard(); \
56 #define enable_fpu() \
62 #define disable_fpu() \
69 #define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU)
71 static inline int __is_fpu_owner(void)
73 return test_thread_flag(TIF_USEDFPU
);
76 static inline int is_fpu_owner(void)
78 return cpu_has_fpu
&& __is_fpu_owner();
81 static inline void __own_fpu(void)
84 KSTK_STATUS(current
) |= ST0_CU1
;
85 set_thread_flag(TIF_USEDFPU
);
88 static inline void own_fpu_inatomic(int restore
)
90 if (cpu_has_fpu
&& !__is_fpu_owner()) {
97 static inline void own_fpu(int restore
)
100 own_fpu_inatomic(restore
);
104 static inline void lose_fpu(int save
)
107 if (is_fpu_owner()) {
110 KSTK_STATUS(current
) &= ~ST0_CU1
;
111 clear_thread_flag(TIF_USEDFPU
);
117 static inline void init_fpu(void)
124 fpu_emulator_init_fpu();
129 static inline void save_fp(struct task_struct
*tsk
)
135 static inline void restore_fp(struct task_struct
*tsk
)
141 static inline fpureg_t
*get_fpu_regs(struct task_struct
*tsk
)
143 if (tsk
== current
) {
150 return tsk
->thread
.fpu
.fpr
;
153 #endif /* _ASM_FPU_H */
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