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/config.h>
14 #include <linux/sched.h>
15 #include <linux/thread_info.h>
17 #include <asm/mipsregs.h>
19 #include <asm/cpu-features.h>
20 #include <asm/bitops.h>
21 #include <asm/processor.h>
22 #include <asm/current.h>
27 extern asmlinkage
int (*save_fp_context
)(struct sigcontext
*sc
);
28 extern asmlinkage
int (*restore_fp_context
)(struct sigcontext
*sc
);
30 extern asmlinkage
int (*save_fp_context32
)(struct sigcontext32
*sc
);
31 extern asmlinkage
int (*restore_fp_context32
)(struct sigcontext32
*sc
);
33 extern void fpu_emulator_init_fpu(void);
34 extern void _init_fpu(void);
35 extern void _save_fp(struct task_struct
*);
36 extern void _restore_fp(struct task_struct
*);
38 #if defined(CONFIG_CPU_SB1)
39 #define __enable_fpu_hazard() \
41 asm(".set push \n\t" \
43 ".set noreorder \n\t" \
45 "bnezl $0, .+4 \n\t" \
50 #define __enable_fpu_hazard() \
52 asm("nop;nop;nop;nop"); /* max. hazard */ \
56 #define __enable_fpu() \
58 set_c0_status(ST0_CU1); \
59 __enable_fpu_hazard(); \
62 #define __disable_fpu() \
64 clear_c0_status(ST0_CU1); \
65 /* We don't care about the c0 hazard here */ \
68 #define enable_fpu() \
74 #define disable_fpu() \
81 #define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU)
83 static inline int __is_fpu_owner(void)
85 return test_thread_flag(TIF_USEDFPU
);
88 static inline int is_fpu_owner(void)
90 return cpu_has_fpu
&& __is_fpu_owner();
93 static inline void own_fpu(void)
97 KSTK_STATUS(current
) |= ST0_CU1
;
98 set_thread_flag(TIF_USEDFPU
);
102 static inline void lose_fpu(void)
105 KSTK_STATUS(current
) &= ~ST0_CU1
;
106 clear_thread_flag(TIF_USEDFPU
);
111 static inline void init_fpu(void)
116 fpu_emulator_init_fpu();
120 static inline void save_fp(struct task_struct
*tsk
)
126 static inline void restore_fp(struct task_struct
*tsk
)
132 static inline fpureg_t
*get_fpu_regs(struct task_struct
*tsk
)
135 if ((tsk
== current
) && __is_fpu_owner())
137 return tsk
->thread
.fpu
.hard
.fpr
;
140 return tsk
->thread
.fpu
.soft
.fpr
;
143 #endif /* _ASM_FPU_H */