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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/sched.h>
14#include <linux/thread_info.h>
15#include <linux/bitops.h>
16
17#include <asm/mipsregs.h>
18#include <asm/cpu.h>
19#include <asm/cpu-features.h>
20#include <asm/hazards.h>
21#include <asm/processor.h>
22#include <asm/current.h>
23
24#ifdef CONFIG_MIPS_MT_FPAFF
25#include <asm/mips_mt.h>
26#endif
27
28struct sigcontext;
29struct sigcontext32;
30
31extern void fpu_emulator_init_fpu(void);
32extern void _init_fpu(void);
33extern void _save_fp(struct task_struct *);
34extern void _restore_fp(struct task_struct *);
35
36#define __enable_fpu() \
37do { \
38 set_c0_status(ST0_CU1); \
39 enable_fpu_hazard(); \
40} while (0)
41
42#define __disable_fpu() \
43do { \
44 clear_c0_status(ST0_CU1); \
45 disable_fpu_hazard(); \
46} while (0)
47
48#define enable_fpu() \
49do { \
50 if (cpu_has_fpu) \
51 __enable_fpu(); \
52} while (0)
53
54#define disable_fpu() \
55do { \
56 if (cpu_has_fpu) \
57 __disable_fpu(); \
58} while (0)
59
60
61#define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU)
62
63static inline int __is_fpu_owner(void)
64{
65 return test_thread_flag(TIF_USEDFPU);
66}
67
68static inline int is_fpu_owner(void)
69{
70 return cpu_has_fpu && __is_fpu_owner();
71}
72
73static inline void __own_fpu(void)
74{
75 __enable_fpu();
76 KSTK_STATUS(current) |= ST0_CU1;
77 set_thread_flag(TIF_USEDFPU);
78}
79
80static inline void own_fpu_inatomic(int restore)
81{
82 if (cpu_has_fpu && !__is_fpu_owner()) {
83 __own_fpu();
84 if (restore)
85 _restore_fp(current);
86 }
87}
88
89static inline void own_fpu(int restore)
90{
91 preempt_disable();
92 own_fpu_inatomic(restore);
93 preempt_enable();
94}
95
96static inline void lose_fpu(int save)
97{
98 preempt_disable();
99 if (is_fpu_owner()) {
100 if (save)
101 _save_fp(current);
102 KSTK_STATUS(current) &= ~ST0_CU1;
103 clear_thread_flag(TIF_USEDFPU);
104 __disable_fpu();
105 }
106 preempt_enable();
107}
108
109static inline void init_fpu(void)
110{
111 preempt_disable();
112 if (cpu_has_fpu) {
113 __own_fpu();
114 _init_fpu();
115 } else {
116 fpu_emulator_init_fpu();
117 }
118 preempt_enable();
119}
120
121static inline void save_fp(struct task_struct *tsk)
122{
123 if (cpu_has_fpu)
124 _save_fp(tsk);
125}
126
127static inline void restore_fp(struct task_struct *tsk)
128{
129 if (cpu_has_fpu)
130 _restore_fp(tsk);
131}
132
133static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
134{
135 if (tsk == current) {
136 preempt_disable();
137 if (is_fpu_owner())
138 _save_fp(current);
139 preempt_enable();
140 }
141
142 return tsk->thread.fpu.fpr;
143}
144
145#endif /* _ASM_FPU_H */
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/sched.h>
14#include <linux/thread_info.h>
15#include <linux/bitops.h>
16
17#include <asm/mipsregs.h>
18#include <asm/cpu.h>
19#include <asm/cpu-features.h>
20#include <asm/hazards.h>
21#include <asm/processor.h>
22#include <asm/current.h>
23
24#ifdef CONFIG_MIPS_MT_FPAFF
25#include <asm/mips_mt.h>
26#endif
27
28struct sigcontext;
29struct sigcontext32;
30
31extern void fpu_emulator_init_fpu(void);
32extern void _init_fpu(void);
33extern void _save_fp(struct task_struct *);
34extern void _restore_fp(struct task_struct *);
35
36#define __enable_fpu() \
37do { \
38 set_c0_status(ST0_CU1); \
39 enable_fpu_hazard(); \
40} while (0)
41
42#define __disable_fpu() \
43do { \
44 clear_c0_status(ST0_CU1); \
45 disable_fpu_hazard(); \
46} while (0)
47
48#define enable_fpu() \
49do { \
50 if (cpu_has_fpu) \
51 __enable_fpu(); \
52} while (0)
53
54#define disable_fpu() \
55do { \
56 if (cpu_has_fpu) \
57 __disable_fpu(); \
58} while (0)
59
60
61#define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU)
62
63static inline int __is_fpu_owner(void)
64{
65 return test_thread_flag(TIF_USEDFPU);
66}
67
68static inline int is_fpu_owner(void)
69{
70 return cpu_has_fpu && __is_fpu_owner();
71}
72
73static inline void __own_fpu(void)
74{
75 __enable_fpu();
76 KSTK_STATUS(current) |= ST0_CU1;
77 set_thread_flag(TIF_USEDFPU);
78}
79
80static inline void own_fpu_inatomic(int restore)
81{
82 if (cpu_has_fpu && !__is_fpu_owner()) {
83 __own_fpu();
84 if (restore)
85 _restore_fp(current);
86 }
87}
88
89static inline void own_fpu(int restore)
90{
91 preempt_disable();
92 own_fpu_inatomic(restore);
93 preempt_enable();
94}
95
96static inline void lose_fpu(int save)
97{
98 preempt_disable();
99 if (is_fpu_owner()) {
100 if (save)
101 _save_fp(current);
102 KSTK_STATUS(current) &= ~ST0_CU1;
103 clear_thread_flag(TIF_USEDFPU);
104 __disable_fpu();
105 }
106 preempt_enable();
107}
108
109static inline void init_fpu(void)
110{
111 preempt_disable();
112 if (cpu_has_fpu) {
113 __own_fpu();
114 _init_fpu();
115 } else {
116 fpu_emulator_init_fpu();
117 }
118 preempt_enable();
119}
120
121static inline void save_fp(struct task_struct *tsk)
122{
123 if (cpu_has_fpu)
124 _save_fp(tsk);
125}
126
127static inline void restore_fp(struct task_struct *tsk)
128{
129 if (cpu_has_fpu)
130 _restore_fp(tsk);
131}
132
133static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
134{
135 if (tsk == current) {
136 preempt_disable();
137 if (is_fpu_owner())
138 _save_fp(current);
139 preempt_enable();
140 }
141
142 return tsk->thread.fpu.fpr;
143}
144
145#endif /* _ASM_FPU_H */