[CPUFREQ] Fix the p4-clockmod N60 errata workaround.
[linux-2.6/mini2440.git] / include / asm-mips / fpu.h
blob9c828b1f821875e273bdd3da8f9a6b3fcf98e27b
1 /*
2 * Copyright (C) 2002 MontaVista Software Inc.
3 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
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
13 #include <linux/config.h>
14 #include <linux/sched.h>
15 #include <linux/thread_info.h>
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>
24 struct sigcontext;
25 struct sigcontext32;
27 extern asmlinkage int (*save_fp_context)(struct sigcontext *sc);
28 extern asmlinkage int (*restore_fp_context)(struct sigcontext *sc);
30 extern asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc);
31 extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 *sc);
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 *);
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
56 #define __enable_fpu() \
57 do { \
58 set_c0_status(ST0_CU1); \
59 __enable_fpu_hazard(); \
60 } while (0)
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)
68 #define enable_fpu() \
69 do { \
70 if (cpu_has_fpu) \
71 __enable_fpu(); \
72 } while (0)
74 #define disable_fpu() \
75 do { \
76 if (cpu_has_fpu) \
77 __disable_fpu(); \
78 } while (0)
81 #define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU)
83 static inline int __is_fpu_owner(void)
85 return test_thread_flag(TIF_USEDFPU);
88 static inline int is_fpu_owner(void)
90 return cpu_has_fpu && __is_fpu_owner();
93 static inline void own_fpu(void)
95 if (cpu_has_fpu) {
96 __enable_fpu();
97 KSTK_STATUS(current) |= ST0_CU1;
98 set_thread_flag(TIF_USEDFPU);
102 static inline void lose_fpu(void)
104 if (cpu_has_fpu) {
105 KSTK_STATUS(current) &= ~ST0_CU1;
106 clear_thread_flag(TIF_USEDFPU);
107 __disable_fpu();
111 static inline void init_fpu(void)
113 if (cpu_has_fpu) {
114 _init_fpu();
115 } else {
116 fpu_emulator_init_fpu();
120 static inline void save_fp(struct task_struct *tsk)
122 if (cpu_has_fpu)
123 _save_fp(tsk);
126 static inline void restore_fp(struct task_struct *tsk)
128 if (cpu_has_fpu)
129 _restore_fp(tsk);
132 static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
134 if (cpu_has_fpu) {
135 if ((tsk == current) && __is_fpu_owner())
136 _save_fp(current);
137 return tsk->thread.fpu.hard.fpr;
140 return tsk->thread.fpu.soft.fpr;
143 #endif /* _ASM_FPU_H */