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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2002 MontaVista Software Inc. | |
3 | * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net | |
4 | * | |
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. | |
9 | */ | |
10 | #ifndef _ASM_FPU_H | |
11 | #define _ASM_FPU_H | |
12 | ||
1da177e4 LT |
13 | #include <linux/sched.h> |
14 | #include <linux/thread_info.h> | |
15 | ||
16 | #include <asm/mipsregs.h> | |
17 | #include <asm/cpu.h> | |
18 | #include <asm/cpu-features.h> | |
0b624956 | 19 | #include <asm/hazards.h> |
1da177e4 LT |
20 | #include <asm/bitops.h> |
21 | #include <asm/processor.h> | |
22 | #include <asm/current.h> | |
23 | ||
f088fc84 RB |
24 | #ifdef CONFIG_MIPS_MT_FPAFF |
25 | #include <asm/mips_mt.h> | |
26 | #endif | |
27 | ||
1da177e4 LT |
28 | struct sigcontext; |
29 | struct sigcontext32; | |
30 | ||
53dc8028 AN |
31 | extern asmlinkage int (*save_fp_context)(struct sigcontext __user *sc); |
32 | extern asmlinkage int (*restore_fp_context)(struct sigcontext __user *sc); | |
1da177e4 | 33 | |
53dc8028 AN |
34 | extern asmlinkage int (*save_fp_context32)(struct sigcontext32 __user *sc); |
35 | extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 __user *sc); | |
1da177e4 LT |
36 | |
37 | extern void fpu_emulator_init_fpu(void); | |
38 | extern void _init_fpu(void); | |
39 | extern void _save_fp(struct task_struct *); | |
40 | extern void _restore_fp(struct task_struct *); | |
41 | ||
1da177e4 LT |
42 | #define __enable_fpu() \ |
43 | do { \ | |
44 | set_c0_status(ST0_CU1); \ | |
0b624956 | 45 | enable_fpu_hazard(); \ |
1da177e4 LT |
46 | } while (0) |
47 | ||
48 | #define __disable_fpu() \ | |
49 | do { \ | |
50 | clear_c0_status(ST0_CU1); \ | |
0b624956 | 51 | disable_fpu_hazard(); \ |
1da177e4 LT |
52 | } while (0) |
53 | ||
54 | #define enable_fpu() \ | |
55 | do { \ | |
56 | if (cpu_has_fpu) \ | |
57 | __enable_fpu(); \ | |
58 | } while (0) | |
59 | ||
60 | #define disable_fpu() \ | |
61 | do { \ | |
62 | if (cpu_has_fpu) \ | |
63 | __disable_fpu(); \ | |
64 | } while (0) | |
65 | ||
66 | ||
67 | #define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU) | |
68 | ||
1d74f6bc RB |
69 | static inline int __is_fpu_owner(void) |
70 | { | |
71 | return test_thread_flag(TIF_USEDFPU); | |
72 | } | |
73 | ||
1da177e4 LT |
74 | static inline int is_fpu_owner(void) |
75 | { | |
1d74f6bc | 76 | return cpu_has_fpu && __is_fpu_owner(); |
1da177e4 LT |
77 | } |
78 | ||
53dc8028 | 79 | static inline void __own_fpu(void) |
1da177e4 | 80 | { |
53dc8028 AN |
81 | __enable_fpu(); |
82 | KSTK_STATUS(current) |= ST0_CU1; | |
83 | set_thread_flag(TIF_USEDFPU); | |
84 | } | |
85 | ||
faea6234 | 86 | static inline void own_fpu_inatomic(int restore) |
53dc8028 | 87 | { |
53dc8028 AN |
88 | if (cpu_has_fpu && !__is_fpu_owner()) { |
89 | __own_fpu(); | |
90 | if (restore) | |
91 | _restore_fp(current); | |
1da177e4 | 92 | } |
faea6234 AN |
93 | } |
94 | ||
95 | static inline void own_fpu(int restore) | |
96 | { | |
97 | preempt_disable(); | |
98 | own_fpu_inatomic(restore); | |
53dc8028 | 99 | preempt_enable(); |
1da177e4 LT |
100 | } |
101 | ||
53dc8028 | 102 | static inline void lose_fpu(int save) |
1da177e4 | 103 | { |
53dc8028 AN |
104 | preempt_disable(); |
105 | if (is_fpu_owner()) { | |
106 | if (save) | |
107 | _save_fp(current); | |
1da177e4 | 108 | KSTK_STATUS(current) &= ~ST0_CU1; |
42a3b4f2 | 109 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
110 | __disable_fpu(); |
111 | } | |
53dc8028 | 112 | preempt_enable(); |
1da177e4 LT |
113 | } |
114 | ||
115 | static inline void init_fpu(void) | |
116 | { | |
53dc8028 | 117 | preempt_disable(); |
1da177e4 | 118 | if (cpu_has_fpu) { |
53dc8028 | 119 | __own_fpu(); |
1da177e4 LT |
120 | _init_fpu(); |
121 | } else { | |
122 | fpu_emulator_init_fpu(); | |
123 | } | |
53dc8028 | 124 | preempt_enable(); |
1da177e4 LT |
125 | } |
126 | ||
127 | static inline void save_fp(struct task_struct *tsk) | |
128 | { | |
129 | if (cpu_has_fpu) | |
130 | _save_fp(tsk); | |
131 | } | |
132 | ||
133 | static inline void restore_fp(struct task_struct *tsk) | |
134 | { | |
135 | if (cpu_has_fpu) | |
136 | _restore_fp(tsk); | |
137 | } | |
138 | ||
139 | static inline fpureg_t *get_fpu_regs(struct task_struct *tsk) | |
140 | { | |
e04582b7 AN |
141 | if (tsk == current) { |
142 | preempt_disable(); | |
143 | if (is_fpu_owner()) | |
1da177e4 | 144 | _save_fp(current); |
e04582b7 | 145 | preempt_enable(); |
1da177e4 LT |
146 | } |
147 | ||
eae89076 | 148 | return tsk->thread.fpu.fpr; |
1da177e4 LT |
149 | } |
150 | ||
151 | #endif /* _ASM_FPU_H */ |