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>
16 #include <asm/mipsregs.h>
18 #include <asm/cpu-features.h>
19 #include <asm/bitops.h>
20 #include <asm/processor.h>
21 #include <asm/current.h>
23 #ifdef CONFIG_MIPS_MT_FPAFF
24 #include <asm/mips_mt.h>
30 extern asmlinkage int (*save_fp_context)(struct sigcontext *sc);
31 extern asmlinkage int (*restore_fp_context)(struct sigcontext *sc);
33 extern asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc);
34 extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 *sc);
36 extern void fpu_emulator_init_fpu(void);
37 extern void _init_fpu(void);
38 extern void _save_fp(struct task_struct *);
39 extern void _restore_fp(struct task_struct *);
41 #if defined(CONFIG_CPU_SB1)
42 #define __enable_fpu_hazard() \
44 asm(".set push \n\t" \
46 ".set noreorder \n\t" \
48 "bnezl $0, .+4 \n\t" \
53 #define __enable_fpu_hazard() \
55 asm("nop;nop;nop;nop"); /* max. hazard */ \
59 #define __enable_fpu() \
61 set_c0_status(ST0_CU1); \
62 __enable_fpu_hazard(); \
65 #define __disable_fpu() \
67 clear_c0_status(ST0_CU1); \
68 /* We don't care about the c0 hazard here */ \
71 #define enable_fpu() \
77 #define disable_fpu() \
84 #define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU)
86 static inline int __is_fpu_owner(void)
88 return test_thread_flag(TIF_USEDFPU);
91 static inline int is_fpu_owner(void)
93 return cpu_has_fpu && __is_fpu_owner();
96 static inline void own_fpu(void)
100 KSTK_STATUS(current) |= ST0_CU1;
101 set_thread_flag(TIF_USEDFPU);
105 static inline void lose_fpu(void)
108 KSTK_STATUS(current) &= ~ST0_CU1;
109 clear_thread_flag(TIF_USEDFPU);
114 static inline void init_fpu(void)
119 fpu_emulator_init_fpu();
123 static inline void save_fp(struct task_struct *tsk)
129 static inline void restore_fp(struct task_struct *tsk)
135 static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
138 if ((tsk == current) && __is_fpu_owner())
142 return tsk->thread.fpu.fpr;
145 #endif /* _ASM_FPU_H */