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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 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/thread_info.h> | |
16 | ||
17 | #include <asm/mipsregs.h> | |
18 | #include <asm/cpu.h> | |
19 | #include <asm/cpu-features.h> | |
20 | #include <asm/bitops.h> | |
21 | #include <asm/processor.h> | |
22 | #include <asm/current.h> | |
23 | ||
24 | struct sigcontext; | |
25 | struct sigcontext32; | |
26 | ||
27 | extern asmlinkage int (*save_fp_context)(struct sigcontext *sc); | |
28 | extern asmlinkage int (*restore_fp_context)(struct sigcontext *sc); | |
29 | ||
30 | extern asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc); | |
31 | extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 *sc); | |
32 | ||
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 *); | |
37 | ||
38 | #if defined(CONFIG_CPU_SB1) | |
39 | #define __enable_fpu_hazard() \ | |
40 | do { \ | |
41 | asm(".set push \n\t" \ | |
42 | ".set mips64 \n\t" \ | |
43 | ".set noreorder \n\t" \ | |
44 | "ssnop \n\t" \ | |
45 | "bnezl $0, .+4 \n\t" \ | |
46 | "ssnop \n\t" \ | |
47 | ".set pop"); \ | |
48 | } while (0) | |
49 | #else | |
50 | #define __enable_fpu_hazard() \ | |
51 | do { \ | |
52 | asm("nop;nop;nop;nop"); /* max. hazard */ \ | |
53 | } while (0) | |
54 | #endif | |
55 | ||
56 | #define __enable_fpu() \ | |
57 | do { \ | |
58 | set_c0_status(ST0_CU1); \ | |
59 | __enable_fpu_hazard(); \ | |
60 | } while (0) | |
61 | ||
62 | #define __disable_fpu() \ | |
63 | do { \ | |
64 | clear_c0_status(ST0_CU1); \ | |
65 | /* We don't care about the c0 hazard here */ \ | |
66 | } while (0) | |
67 | ||
68 | #define enable_fpu() \ | |
69 | do { \ | |
70 | if (cpu_has_fpu) \ | |
71 | __enable_fpu(); \ | |
72 | } while (0) | |
73 | ||
74 | #define disable_fpu() \ | |
75 | do { \ | |
76 | if (cpu_has_fpu) \ | |
77 | __disable_fpu(); \ | |
78 | } while (0) | |
79 | ||
80 | ||
81 | #define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU) | |
82 | ||
1d74f6bc RB |
83 | static inline int __is_fpu_owner(void) |
84 | { | |
85 | return test_thread_flag(TIF_USEDFPU); | |
86 | } | |
87 | ||
1da177e4 LT |
88 | static inline int is_fpu_owner(void) |
89 | { | |
1d74f6bc | 90 | return cpu_has_fpu && __is_fpu_owner(); |
1da177e4 LT |
91 | } |
92 | ||
93 | static inline void own_fpu(void) | |
94 | { | |
95 | if (cpu_has_fpu) { | |
96 | __enable_fpu(); | |
97 | KSTK_STATUS(current) |= ST0_CU1; | |
42a3b4f2 | 98 | set_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
99 | } |
100 | } | |
101 | ||
102 | static inline void lose_fpu(void) | |
103 | { | |
104 | if (cpu_has_fpu) { | |
105 | KSTK_STATUS(current) &= ~ST0_CU1; | |
42a3b4f2 | 106 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
107 | __disable_fpu(); |
108 | } | |
109 | } | |
110 | ||
111 | static inline void init_fpu(void) | |
112 | { | |
113 | if (cpu_has_fpu) { | |
114 | _init_fpu(); | |
115 | } else { | |
116 | fpu_emulator_init_fpu(); | |
117 | } | |
118 | } | |
119 | ||
120 | static inline void save_fp(struct task_struct *tsk) | |
121 | { | |
122 | if (cpu_has_fpu) | |
123 | _save_fp(tsk); | |
124 | } | |
125 | ||
126 | static inline void restore_fp(struct task_struct *tsk) | |
127 | { | |
128 | if (cpu_has_fpu) | |
129 | _restore_fp(tsk); | |
130 | } | |
131 | ||
132 | static inline fpureg_t *get_fpu_regs(struct task_struct *tsk) | |
133 | { | |
134 | if (cpu_has_fpu) { | |
1d74f6bc | 135 | if ((tsk == current) && __is_fpu_owner()) |
1da177e4 LT |
136 | _save_fp(current); |
137 | return tsk->thread.fpu.hard.fpr; | |
138 | } | |
139 | ||
140 | return tsk->thread.fpu.soft.fpr; | |
141 | } | |
142 | ||
143 | #endif /* _ASM_FPU_H */ |