projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 { \ | |
| 38 | set_c0_status(ST0_CU1); \ | |
| 0b624956 | 39 | enable_fpu_hazard(); \ |
| 1da177e4 LT |
40 | } while (0) |
| 41 | ||
| 42 | #define __disable_fpu() \ | |
| 43 | do { \ | |
| 44 | clear_c0_status(ST0_CU1); \ | |
| 0b624956 | 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 */ |