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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> | |
1977f032 | 15 | #include <linux/bitops.h> |
1da177e4 LT |
16 | |
17 | #include <asm/mipsregs.h> | |
18 | #include <asm/cpu.h> | |
19 | #include <asm/cpu-features.h> | |
0b624956 | 20 | #include <asm/hazards.h> |
1da177e4 LT |
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); | |
f028b860 DV |
38 | extern int fpu_emulator_save_context(struct sigcontext __user *sc); |
39 | extern int fpu_emulator_restore_context(struct sigcontext __user *sc); | |
1da177e4 LT |
40 | extern void _init_fpu(void); |
41 | extern void _save_fp(struct task_struct *); | |
42 | extern void _restore_fp(struct task_struct *); | |
43 | ||
1da177e4 LT |
44 | #define __enable_fpu() \ |
45 | do { \ | |
46 | set_c0_status(ST0_CU1); \ | |
0b624956 | 47 | enable_fpu_hazard(); \ |
1da177e4 LT |
48 | } while (0) |
49 | ||
50 | #define __disable_fpu() \ | |
51 | do { \ | |
52 | clear_c0_status(ST0_CU1); \ | |
0b624956 | 53 | disable_fpu_hazard(); \ |
1da177e4 LT |
54 | } while (0) |
55 | ||
56 | #define enable_fpu() \ | |
57 | do { \ | |
58 | if (cpu_has_fpu) \ | |
59 | __enable_fpu(); \ | |
60 | } while (0) | |
61 | ||
62 | #define disable_fpu() \ | |
63 | do { \ | |
64 | if (cpu_has_fpu) \ | |
65 | __disable_fpu(); \ | |
66 | } while (0) | |
67 | ||
68 | ||
69 | #define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU) | |
70 | ||
1d74f6bc RB |
71 | static inline int __is_fpu_owner(void) |
72 | { | |
73 | return test_thread_flag(TIF_USEDFPU); | |
74 | } | |
75 | ||
1da177e4 LT |
76 | static inline int is_fpu_owner(void) |
77 | { | |
1d74f6bc | 78 | return cpu_has_fpu && __is_fpu_owner(); |
1da177e4 LT |
79 | } |
80 | ||
53dc8028 | 81 | static inline void __own_fpu(void) |
1da177e4 | 82 | { |
53dc8028 AN |
83 | __enable_fpu(); |
84 | KSTK_STATUS(current) |= ST0_CU1; | |
85 | set_thread_flag(TIF_USEDFPU); | |
86 | } | |
87 | ||
faea6234 | 88 | static inline void own_fpu_inatomic(int restore) |
53dc8028 | 89 | { |
53dc8028 AN |
90 | if (cpu_has_fpu && !__is_fpu_owner()) { |
91 | __own_fpu(); | |
92 | if (restore) | |
93 | _restore_fp(current); | |
1da177e4 | 94 | } |
faea6234 AN |
95 | } |
96 | ||
97 | static inline void own_fpu(int restore) | |
98 | { | |
99 | preempt_disable(); | |
100 | own_fpu_inatomic(restore); | |
53dc8028 | 101 | preempt_enable(); |
1da177e4 LT |
102 | } |
103 | ||
53dc8028 | 104 | static inline void lose_fpu(int save) |
1da177e4 | 105 | { |
53dc8028 AN |
106 | preempt_disable(); |
107 | if (is_fpu_owner()) { | |
108 | if (save) | |
109 | _save_fp(current); | |
1da177e4 | 110 | KSTK_STATUS(current) &= ~ST0_CU1; |
42a3b4f2 | 111 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
112 | __disable_fpu(); |
113 | } | |
53dc8028 | 114 | preempt_enable(); |
1da177e4 LT |
115 | } |
116 | ||
117 | static inline void init_fpu(void) | |
118 | { | |
53dc8028 | 119 | preempt_disable(); |
1da177e4 | 120 | if (cpu_has_fpu) { |
53dc8028 | 121 | __own_fpu(); |
1da177e4 LT |
122 | _init_fpu(); |
123 | } else { | |
124 | fpu_emulator_init_fpu(); | |
125 | } | |
53dc8028 | 126 | preempt_enable(); |
1da177e4 LT |
127 | } |
128 | ||
129 | static inline void save_fp(struct task_struct *tsk) | |
130 | { | |
131 | if (cpu_has_fpu) | |
132 | _save_fp(tsk); | |
133 | } | |
134 | ||
135 | static inline void restore_fp(struct task_struct *tsk) | |
136 | { | |
137 | if (cpu_has_fpu) | |
138 | _restore_fp(tsk); | |
139 | } | |
140 | ||
141 | static inline fpureg_t *get_fpu_regs(struct task_struct *tsk) | |
142 | { | |
e04582b7 AN |
143 | if (tsk == current) { |
144 | preempt_disable(); | |
145 | if (is_fpu_owner()) | |
1da177e4 | 146 | _save_fp(current); |
e04582b7 | 147 | preempt_enable(); |
1da177e4 LT |
148 | } |
149 | ||
eae89076 | 150 | return tsk->thread.fpu.fpr; |
1da177e4 LT |
151 | } |
152 | ||
153 | #endif /* _ASM_FPU_H */ |