[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 <asm/mipsregs.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>
#include <asm/bitops.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 *);

#if defined(CONFIG_CPU_SB1)
#define __enable_fpu_hazard()						\
do {									\
	asm(".set	push		\n\t"				\
	    ".set	mips64		\n\t"				\
	    ".set	noreorder	\n\t"				\
	    "ssnop			\n\t"				\
	    "bnezl	$0, .+4		\n\t"				\
	    "ssnop			\n\t"				\
	    ".set pop");						\
} while (0)
#else
#define __enable_fpu_hazard()						\
do {									\
	asm("nop;nop;nop;nop");		/* max. hazard */		\
} while (0)
#endif

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

#define __disable_fpu()							\
do {									\
	clear_c0_status(ST0_CU1);					\
	/* We don't care about the c0 hazard here  */			\
} 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(int restore)
{
	preempt_disable();
	if (cpu_has_fpu && !__is_fpu_owner()) {
		__own_fpu();
		if (restore)
			_restore_fp(current);
	}
	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>
	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
53dc8028 AN	30	extern asmlinkage int (save_fp_context)(struct sigcontext __user sc);
53dc8028 AN	31	extern asmlinkage int (restore_fp_context)(struct sigcontext __user sc);
1da177e4	32
53dc8028 AN	33	extern asmlinkage int (save_fp_context32)(struct sigcontext32 __user sc);
53dc8028 AN	34	extern asmlinkage int (restore_fp_context32)(struct sigcontext32 __user sc);
1da177e4 LT	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)
1da177e4 LT	92	{
1d74f6bc	93	return cpu_has_fpu && __is_fpu_owner();
1da177e4 LT	94	}
1da177e4 LT	95
53dc8028	96	static inline void __own_fpu(void)
1da177e4	97	{
53dc8028 AN	98	__enable_fpu();
	99	KSTK_STATUS(current) \|= ST0_CU1;
	100	set_thread_flag(TIF_USEDFPU);
	101	}
	102
	103	static inline void own_fpu(int restore)
	104	{
	105	preempt_disable();
	106	if (cpu_has_fpu && !__is_fpu_owner()) {
	107	__own_fpu();
	108	if (restore)
	109	_restore_fp(current);
1da177e4	110	}
53dc8028	111	preempt_enable();
1da177e4 LT	112	}
1da177e4 LT	113
53dc8028	114	static inline void lose_fpu(int save)
1da177e4	115	{
53dc8028 AN	116	preempt_disable();
	117	if (is_fpu_owner()) {
	118	if (save)
	119	_save_fp(current);
1da177e4	120	KSTK_STATUS(current) &= ~ST0_CU1;
42a3b4f2	121	clear_thread_flag(TIF_USEDFPU);
1da177e4 LT	122	__disable_fpu();
1da177e4 LT	123	}
53dc8028	124	preempt_enable();
1da177e4 LT	125	}
	126
	127	static inline void init_fpu(void)
	128	{
53dc8028	129	preempt_disable();
1da177e4	130	if (cpu_has_fpu) {
53dc8028	131	__own_fpu();
1da177e4 LT	132	_init_fpu();
	133	} else {
	134	fpu_emulator_init_fpu();
	135	}
53dc8028	136	preempt_enable();
1da177e4 LT	137	}
	138
	139	static inline void save_fp(struct task_struct *tsk)
	140	{
	141	if (cpu_has_fpu)
	142	_save_fp(tsk);
	143	}
	144
	145	static inline void restore_fp(struct task_struct *tsk)
	146	{
	147	if (cpu_has_fpu)
	148	_restore_fp(tsk);
	149	}
	150
	151	static inline fpureg_t get_fpu_regs(struct task_struct tsk)
	152	{
e04582b7 AN	153	if (tsk == current) {
	154	preempt_disable();
	155	if (is_fpu_owner())
1da177e4	156	_save_fp(current);
e04582b7	157	preempt_enable();
1da177e4 LT	158	}
1da177e4 LT	159
eae89076	160	return tsk->thread.fpu.fpr;
1da177e4 LT	161	}
	162
	163	#endif /* _ASM_FPU_H */