projects / mirror_ubuntu-artful-kernel.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> | |
| 15 | ||
| 16 | #include <asm/mipsregs.h> | |
| 17 | #include <asm/cpu.h> | |
| 18 | #include <asm/cpu-features.h> | |
| 19 | #include <asm/bitops.h> | |
| 20 | #include <asm/processor.h> | |
| 21 | #include <asm/current.h> | |
| 22 | ||
| f088fc84 RB |
23 | #ifdef CONFIG_MIPS_MT_FPAFF |
| 24 | #include <asm/mips_mt.h> | |
| 25 | #endif | |
| 26 | ||
| 1da177e4 LT |
27 | struct sigcontext; |
| 28 | struct sigcontext32; | |
| 29 | ||
| 30 | extern asmlinkage int (*save_fp_context)(struct sigcontext *sc); | |
| 31 | extern asmlinkage int (*restore_fp_context)(struct sigcontext *sc); | |
| 32 | ||
| 33 | extern asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc); | |
| 34 | extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 *sc); | |
| 35 | ||
| 36 | extern void fpu_emulator_init_fpu(void); | |
| 37 | extern void _init_fpu(void); | |
| 38 | extern void _save_fp(struct task_struct *); | |
| 39 | extern void _restore_fp(struct task_struct *); | |
| 40 | ||
| 41 | #if defined(CONFIG_CPU_SB1) | |
| 42 | #define __enable_fpu_hazard() \ | |
| 43 | do { \ | |
| 44 | asm(".set push \n\t" \ | |
| 45 | ".set mips64 \n\t" \ | |
| 46 | ".set noreorder \n\t" \ | |
| 47 | "ssnop \n\t" \ | |
| 48 | "bnezl $0, .+4 \n\t" \ | |
| 49 | "ssnop \n\t" \ | |
| 50 | ".set pop"); \ | |
| 51 | } while (0) | |
| 52 | #else | |
| 53 | #define __enable_fpu_hazard() \ | |
| 54 | do { \ | |
| 55 | asm("nop;nop;nop;nop"); /* max. hazard */ \ | |
| 56 | } while (0) | |
| 57 | #endif | |
| 58 | ||
| 59 | #define __enable_fpu() \ | |
| 60 | do { \ | |
| 61 | set_c0_status(ST0_CU1); \ | |
| 62 | __enable_fpu_hazard(); \ | |
| 63 | } while (0) | |
| 64 | ||
| 65 | #define __disable_fpu() \ | |
| 66 | do { \ | |
| 67 | clear_c0_status(ST0_CU1); \ | |
| 68 | /* We don't care about the c0 hazard here */ \ | |
| 69 | } while (0) | |
| 70 | ||
| 71 | #define enable_fpu() \ | |
| 72 | do { \ | |
| 73 | if (cpu_has_fpu) \ | |
| 74 | __enable_fpu(); \ | |
| 75 | } while (0) | |
| 76 | ||
| 77 | #define disable_fpu() \ | |
| 78 | do { \ | |
| 79 | if (cpu_has_fpu) \ | |
| 80 | __disable_fpu(); \ | |
| 81 | } while (0) | |
| 82 | ||
| 83 | ||
| 84 | #define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU) | |
| 85 | ||
| 1d74f6bc RB |
86 | static inline int __is_fpu_owner(void) |
| 87 | { | |
| 88 | return test_thread_flag(TIF_USEDFPU); | |
| 89 | } | |
| 90 | ||
| 1da177e4 LT |
91 | static inline int is_fpu_owner(void) |
| 92 | { | |
| 1d74f6bc | 93 | return cpu_has_fpu && __is_fpu_owner(); |
| 1da177e4 LT |
94 | } |
| 95 | ||
| 96 | static inline void own_fpu(void) | |
| 97 | { | |
| 98 | if (cpu_has_fpu) { | |
| 99 | __enable_fpu(); | |
| 100 | KSTK_STATUS(current) |= ST0_CU1; | |
| 42a3b4f2 | 101 | set_thread_flag(TIF_USEDFPU); |
| 1da177e4 LT |
102 | } |
| 103 | } | |
| 104 | ||
| 105 | static inline void lose_fpu(void) | |
| 106 | { | |
| 107 | if (cpu_has_fpu) { | |
| 108 | KSTK_STATUS(current) &= ~ST0_CU1; | |
| 42a3b4f2 | 109 | clear_thread_flag(TIF_USEDFPU); |
| 1da177e4 LT |
110 | __disable_fpu(); |
| 111 | } | |
| 112 | } | |
| 113 | ||
| 114 | static inline void init_fpu(void) | |
| 115 | { | |
| 116 | if (cpu_has_fpu) { | |
| 117 | _init_fpu(); | |
| 118 | } else { | |
| 119 | fpu_emulator_init_fpu(); | |
| 120 | } | |
| 121 | } | |
| 122 | ||
| 123 | static inline void save_fp(struct task_struct *tsk) | |
| 124 | { | |
| 125 | if (cpu_has_fpu) | |
| 126 | _save_fp(tsk); | |
| 127 | } | |
| 128 | ||
| 129 | static inline void restore_fp(struct task_struct *tsk) | |
| 130 | { | |
| 131 | if (cpu_has_fpu) | |
| 132 | _restore_fp(tsk); | |
| 133 | } | |
| 134 | ||
| 135 | static inline fpureg_t *get_fpu_regs(struct task_struct *tsk) | |
| 136 | { | |
| 137 | if (cpu_has_fpu) { | |
| 1d74f6bc | 138 | if ((tsk == current) && __is_fpu_owner()) |
| 1da177e4 | 139 | _save_fp(current); |
| 1da177e4 LT |
140 | } |
| 141 | ||
| eae89076 | 142 | return tsk->thread.fpu.fpr; |
| 1da177e4 LT |
143 | } |
| 144 | ||
| 145 | #endif /* _ASM_FPU_H */ |