[linux-2.6-block.git] / include / asm-mips / fpu.h

/*
 * Copyright (C) 2002 MontaVista Software Inc.
 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#ifndef _ASM_FPU_H
#define _ASM_FPU_H

#include <linux/sched.h>
#include <linux/thread_info.h>
#include <linux/bitops.h>

#include <asm/mipsregs.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>
#include <asm/hazards.h>
#include <asm/processor.h>
#include <asm/current.h>

#ifdef CONFIG_MIPS_MT_FPAFF
#include <asm/mips_mt.h>
#endif

struct sigcontext;
struct sigcontext32;

extern asmlinkage int (*save_fp_context)(struct sigcontext __user *sc);
extern asmlinkage int (*restore_fp_context)(struct sigcontext __user *sc);

extern asmlinkage int (*save_fp_context32)(struct sigcontext32 __user *sc);
extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 __user *sc);

extern void fpu_emulator_init_fpu(void);
extern void _init_fpu(void);
extern void _save_fp(struct task_struct *);
extern void _restore_fp(struct task_struct *);

#define __enable_fpu()							\
do {									\
        set_c0_status(ST0_CU1);						\
        enable_fpu_hazard();						\
} while (0)

#define __disable_fpu()							\
do {									\
	clear_c0_status(ST0_CU1);					\
        disable_fpu_hazard();						\
} while (0)

#define enable_fpu()							\
do {									\
	if (cpu_has_fpu)						\
		__enable_fpu();						\
} while (0)

#define disable_fpu()							\
do {									\
	if (cpu_has_fpu)						\
		__disable_fpu();					\
} while (0)


#define clear_fpu_owner()	clear_thread_flag(TIF_USEDFPU)

static inline int __is_fpu_owner(void)
{
	return test_thread_flag(TIF_USEDFPU);
}

static inline int is_fpu_owner(void)
{
	return cpu_has_fpu && __is_fpu_owner();
}

static inline void __own_fpu(void)
{
	__enable_fpu();
	KSTK_STATUS(current) |= ST0_CU1;
	set_thread_flag(TIF_USEDFPU);
}

static inline void own_fpu_inatomic(int restore)
{
	if (cpu_has_fpu && !__is_fpu_owner()) {
		__own_fpu();
		if (restore)
			_restore_fp(current);
	}
}

static inline void own_fpu(int restore)
{
	preempt_disable();
	own_fpu_inatomic(restore);
	preempt_enable();
}

static inline void lose_fpu(int save)
{
	preempt_disable();
	if (is_fpu_owner()) {
		if (save)
			_save_fp(current);
		KSTK_STATUS(current) &= ~ST0_CU1;
		clear_thread_flag(TIF_USEDFPU);
		__disable_fpu();
	}
	preempt_enable();
}

static inline void init_fpu(void)
{
	preempt_disable();
	if (cpu_has_fpu) {
		__own_fpu();
		_init_fpu();
	} else {
		fpu_emulator_init_fpu();
	}
	preempt_enable();
}

static inline void save_fp(struct task_struct *tsk)
{
	if (cpu_has_fpu)
		_save_fp(tsk);
}

static inline void restore_fp(struct task_struct *tsk)
{
	if (cpu_has_fpu)
		_restore_fp(tsk);
}

static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
{
	if (tsk == current) {
		preempt_disable();
		if (is_fpu_owner())
			_save_fp(current);
		preempt_enable();
	}

	return tsk->thread.fpu.fpr;
}

#endif /* _ASM_FPU_H */
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>
1da177e4 LT	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
53dc8028 AN	31	extern asmlinkage int (save_fp_context)(struct sigcontext __user sc);
53dc8028 AN	32	extern asmlinkage int (restore_fp_context)(struct sigcontext __user sc);
1da177e4	33
53dc8028 AN	34	extern asmlinkage int (save_fp_context32)(struct sigcontext32 __user sc);
53dc8028 AN	35	extern asmlinkage int (restore_fp_context32)(struct sigcontext32 __user sc);
1da177e4 LT	36
	37	extern void fpu_emulator_init_fpu(void);
	38	extern void _init_fpu(void);
	39	extern void _save_fp(struct task_struct *);
	40	extern void _restore_fp(struct task_struct *);
	41
1da177e4 LT	42	#define __enable_fpu() \
	43	do { \
	44	set_c0_status(ST0_CU1); \
0b624956	45	enable_fpu_hazard(); \
1da177e4 LT	46	} while (0)
	47
	48	#define __disable_fpu() \
	49	do { \
	50	clear_c0_status(ST0_CU1); \
0b624956	51	disable_fpu_hazard(); \
1da177e4 LT	52	} while (0)
	53
	54	#define enable_fpu() \
	55	do { \
	56	if (cpu_has_fpu) \
	57	__enable_fpu(); \
	58	} while (0)
	59
	60	#define disable_fpu() \
	61	do { \
	62	if (cpu_has_fpu) \
	63	__disable_fpu(); \
	64	} while (0)
	65
	66
	67	#define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU)
	68
1d74f6bc RB	69	static inline int __is_fpu_owner(void)
	70	{
	71	return test_thread_flag(TIF_USEDFPU);
	72	}
	73
1da177e4 LT	74	static inline int is_fpu_owner(void)
1da177e4 LT	75	{
1d74f6bc	76	return cpu_has_fpu && __is_fpu_owner();
1da177e4 LT	77	}
1da177e4 LT	78
53dc8028	79	static inline void __own_fpu(void)
1da177e4	80	{
53dc8028 AN	81	__enable_fpu();
	82	KSTK_STATUS(current) \|= ST0_CU1;
	83	set_thread_flag(TIF_USEDFPU);
	84	}
	85
faea6234	86	static inline void own_fpu_inatomic(int restore)
53dc8028	87	{
53dc8028 AN	88	if (cpu_has_fpu && !__is_fpu_owner()) {
	89	__own_fpu();
	90	if (restore)
	91	_restore_fp(current);
1da177e4	92	}
faea6234 AN	93	}
	94
	95	static inline void own_fpu(int restore)
	96	{
	97	preempt_disable();
	98	own_fpu_inatomic(restore);
53dc8028	99	preempt_enable();
1da177e4 LT	100	}
1da177e4 LT	101
53dc8028	102	static inline void lose_fpu(int save)
1da177e4	103	{
53dc8028 AN	104	preempt_disable();
	105	if (is_fpu_owner()) {
	106	if (save)
	107	_save_fp(current);
1da177e4	108	KSTK_STATUS(current) &= ~ST0_CU1;
42a3b4f2	109	clear_thread_flag(TIF_USEDFPU);
1da177e4 LT	110	__disable_fpu();
1da177e4 LT	111	}
53dc8028	112	preempt_enable();
1da177e4 LT	113	}
	114
	115	static inline void init_fpu(void)
	116	{
53dc8028	117	preempt_disable();
1da177e4	118	if (cpu_has_fpu) {
53dc8028	119	__own_fpu();
1da177e4 LT	120	_init_fpu();
	121	} else {
	122	fpu_emulator_init_fpu();
	123	}
53dc8028	124	preempt_enable();
1da177e4 LT	125	}
	126
	127	static inline void save_fp(struct task_struct *tsk)
	128	{
	129	if (cpu_has_fpu)
	130	_save_fp(tsk);
	131	}
	132
	133	static inline void restore_fp(struct task_struct *tsk)
	134	{
	135	if (cpu_has_fpu)
	136	_restore_fp(tsk);
	137	}
	138
	139	static inline fpureg_t get_fpu_regs(struct task_struct tsk)
	140	{
e04582b7 AN	141	if (tsk == current) {
	142	preempt_disable();
	143	if (is_fpu_owner())
1da177e4	144	_save_fp(current);
e04582b7	145	preempt_enable();
1da177e4 LT	146	}
1da177e4 LT	147
eae89076	148	return tsk->thread.fpu.fpr;
1da177e4 LT	149	}
	150
	151	#endif /* _ASM_FPU_H */