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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 | ||
1da177e4 LT |
31 | extern void fpu_emulator_init_fpu(void); |
32 | extern void _init_fpu(void); | |
33 | extern void _save_fp(struct task_struct *); | |
34 | extern void _restore_fp(struct task_struct *); | |
35 | ||
1da177e4 LT |
36 | #define __enable_fpu() \ |
37 | do { \ | |
70342287 RB |
38 | set_c0_status(ST0_CU1); \ |
39 | enable_fpu_hazard(); \ | |
1da177e4 LT |
40 | } while (0) |
41 | ||
42 | #define __disable_fpu() \ | |
43 | do { \ | |
44 | clear_c0_status(ST0_CU1); \ | |
70342287 | 45 | disable_fpu_hazard(); \ |
1da177e4 LT |
46 | } while (0) |
47 | ||
48 | #define enable_fpu() \ | |
49 | do { \ | |
50 | if (cpu_has_fpu) \ | |
51 | __enable_fpu(); \ | |
52 | } while (0) | |
53 | ||
54 | #define disable_fpu() \ | |
55 | do { \ | |
56 | if (cpu_has_fpu) \ | |
57 | __disable_fpu(); \ | |
58 | } while (0) | |
59 | ||
60 | ||
61 | #define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU) | |
62 | ||
1d74f6bc RB |
63 | static inline int __is_fpu_owner(void) |
64 | { | |
65 | return test_thread_flag(TIF_USEDFPU); | |
66 | } | |
67 | ||
1da177e4 LT |
68 | static inline int is_fpu_owner(void) |
69 | { | |
1d74f6bc | 70 | return cpu_has_fpu && __is_fpu_owner(); |
1da177e4 LT |
71 | } |
72 | ||
53dc8028 | 73 | static inline void __own_fpu(void) |
1da177e4 | 74 | { |
53dc8028 AN |
75 | __enable_fpu(); |
76 | KSTK_STATUS(current) |= ST0_CU1; | |
77 | set_thread_flag(TIF_USEDFPU); | |
78 | } | |
79 | ||
faea6234 | 80 | static inline void own_fpu_inatomic(int restore) |
53dc8028 | 81 | { |
53dc8028 AN |
82 | if (cpu_has_fpu && !__is_fpu_owner()) { |
83 | __own_fpu(); | |
84 | if (restore) | |
85 | _restore_fp(current); | |
1da177e4 | 86 | } |
faea6234 AN |
87 | } |
88 | ||
89 | static inline void own_fpu(int restore) | |
90 | { | |
91 | preempt_disable(); | |
92 | own_fpu_inatomic(restore); | |
53dc8028 | 93 | preempt_enable(); |
1da177e4 LT |
94 | } |
95 | ||
53dc8028 | 96 | static inline void lose_fpu(int save) |
1da177e4 | 97 | { |
53dc8028 AN |
98 | preempt_disable(); |
99 | if (is_fpu_owner()) { | |
100 | if (save) | |
101 | _save_fp(current); | |
1da177e4 | 102 | KSTK_STATUS(current) &= ~ST0_CU1; |
42a3b4f2 | 103 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
104 | __disable_fpu(); |
105 | } | |
53dc8028 | 106 | preempt_enable(); |
1da177e4 LT |
107 | } |
108 | ||
109 | static inline void init_fpu(void) | |
110 | { | |
53dc8028 | 111 | preempt_disable(); |
1da177e4 | 112 | if (cpu_has_fpu) { |
53dc8028 | 113 | __own_fpu(); |
1da177e4 LT |
114 | _init_fpu(); |
115 | } else { | |
116 | fpu_emulator_init_fpu(); | |
117 | } | |
53dc8028 | 118 | preempt_enable(); |
1da177e4 LT |
119 | } |
120 | ||
121 | static inline void save_fp(struct task_struct *tsk) | |
122 | { | |
123 | if (cpu_has_fpu) | |
124 | _save_fp(tsk); | |
125 | } | |
126 | ||
127 | static inline void restore_fp(struct task_struct *tsk) | |
128 | { | |
129 | if (cpu_has_fpu) | |
130 | _restore_fp(tsk); | |
131 | } | |
132 | ||
133 | static inline fpureg_t *get_fpu_regs(struct task_struct *tsk) | |
134 | { | |
e04582b7 AN |
135 | if (tsk == current) { |
136 | preempt_disable(); | |
137 | if (is_fpu_owner()) | |
1da177e4 | 138 | _save_fp(current); |
e04582b7 | 139 | preempt_enable(); |
1da177e4 LT |
140 | } |
141 | ||
eae89076 | 142 | return tsk->thread.fpu.fpr; |
1da177e4 LT |
143 | } |
144 | ||
145 | #endif /* _ASM_FPU_H */ |