[apple/xnu.git] / osfmk / i386 / fpu.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon 
 * the rights to redistribute these changes.
 */

/*
 */

#ifndef	_I386_FPU_H_
#define	_I386_FPU_H_

/*
 * Macro definitions for routines to manipulate the
 * floating-point processor.
 */

#include <cpus.h>
#include <i386/proc_reg.h>
#include <i386/thread.h>
#include <kern/kern_types.h>
#include <mach/i386/kern_return.h>
#include <mach/i386/thread_status.h>

/*
 * FPU instructions.
 */
#define	fninit() \
	__asm__ volatile("fninit")

#define	fnstcw(control) \
	__asm__("fnstcw %0" : "=m" (*(unsigned short *)(control)))

#define	fldcw(control) \
	__asm__ volatile("fldcw %0" : : "m" (*(unsigned short *) &(control)) )

extern unsigned short		fnstsw(void);

extern __inline__ unsigned short fnstsw(void)
{
	unsigned short status;
	__asm__ volatile("fnstsw %0" : "=ma" (status));
	return(status);
}

#define	fnclex() \
	__asm__ volatile("fnclex")

#define	fnsave(state)  \
	__asm__ volatile("fnsave %0" : "=m" (*state))

#define	frstor(state) \
	__asm__ volatile("frstor %0" : : "m" (state))

#define fwait() \
    	__asm__("fwait");

#define fxrstor(addr)           __asm("fxrstor %0" : : "m" (*(addr)))     
#define fxsave(addr)            __asm __volatile("fxsave %0" : "=m" (*(addr)))

#define FXSAFE() (fp_kind == FP_FXSR)

#define	fpu_load_context(pcb)

/*
 * Save thread`s FPU context.
 * If only one CPU, we just set the task-switched bit,
 * to keep the new thread from using the coprocessor.
 * If multiple CPUs, we save the entire state.
 * NOTE: in order to provide backwards compatible support in the kernel. When saving SSE2 state, we also save the
 * FP state in it's old location. Otherwise fpu_get_state() and fpu_set_state() will stop working
 */
#if	NCPUS > 1
#define	fpu_save_context(thread) \
    { \
	register struct i386_fpsave_state *ifps; \
	ifps = (thread)->top_act->mact.pcb->ims.ifps; \
	if (ifps != 0 && !ifps->fp_valid) { \
	    /* registers are in FPU - save to memory */ \
	    ifps->fp_valid = TRUE; \
            ifps->fp_save_flavor = FP_387; \
            if (FXSAFE()) { \
		fxsave(&ifps->fx_save_state); \
                ifps->fp_save_flavor = FP_FXSR; \
	    } \
            fnsave(&ifps->fp_save_state); \
	} \
	set_ts(); \
    }
	    
#else	/* NCPUS == 1 */
#define	fpu_save_context(thread) \
    { \
	    set_ts(); \
    }

#endif	/* NCPUS == 1 */


extern int	fp_kind;

extern void		init_fpu(void);
extern void		fpu_module_init(void);
extern void		fp_free(
				struct i386_fpsave_state	* fps);
extern kern_return_t	fpu_set_state(
				thread_act_t			thr_act,
				struct i386_float_state		* st);
extern kern_return_t	fpu_get_state(
				thread_act_t			thr_act,
				struct i386_float_state		* st);
/* extern kern_return_t	fpu_set_fxstate(
				thread_act_t			thr_act,
				struct i386_float_state		* st);
extern kern_return_t	fpu_get_fxstate(
				thread_act_t			thr_act,
				struct i386_float_state		* st); */
extern void		fpnoextflt(void);
extern void		fpextovrflt(void);
extern void		fpexterrflt(void);
extern void		fp_state_alloc(void);
extern void		fpintr(void);
extern void		fpflush(thread_act_t);

#endif	/* _I386_FPU_H_ */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
e5568f75 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
e5568f75 A	12	* This Original Code and all software distributed under the License are
e5568f75 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
e5568f75 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* @OSF_COPYRIGHT@
	24	*/
	25	/*
	26	* Mach Operating System
	27	* Copyright (c) 1991 Carnegie Mellon University
	28	* All Rights Reserved.
	29	*
	30	* Permission to use, copy, modify and distribute this software and its
	31	* documentation is hereby granted, provided that both the copyright
	32	* notice and this permission notice appear in all copies of the
	33	* software, derivative works or modified versions, and any portions
	34	* thereof, and that both notices appear in supporting documentation.
	35	*
	36	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	37	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	38	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	39	*
	40	* Carnegie Mellon requests users of this software to return to
	41	*
	42	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	43	* School of Computer Science
	44	* Carnegie Mellon University
	45	* Pittsburgh PA 15213-3890
	46	*
	47	* any improvements or extensions that they make and grant Carnegie Mellon
	48	* the rights to redistribute these changes.
	49	*/
	50
	51	/*
	52	*/
	53
	54	#ifndef _I386_FPU_H_
	55	#define _I386_FPU_H_
	56
	57	/*
	58	* Macro definitions for routines to manipulate the
	59	* floating-point processor.
	60	*/
	61
	62	#include <cpus.h>
	63	#include <i386/proc_reg.h>
	64	#include <i386/thread.h>
	65	#include <kern/kern_types.h>
	66	#include <mach/i386/kern_return.h>
	67	#include <mach/i386/thread_status.h>
	68
	69	/*
	70	* FPU instructions.
	71	*/
	72	#define fninit() \
	73	__asm__ volatile("fninit")
	74
	75	#define fnstcw(control) \
	76	__asm__("fnstcw %0" : "=m" ((unsigned short )(control)))
	77
	78	#define fldcw(control) \
	79	__asm__ volatile("fldcw %0" : : "m" ((unsigned short ) &(control)) )
	80
	81	extern unsigned short fnstsw(void);
	82
83	extern __inline__ unsigned short fnstsw(void)
84	{
85	unsigned short status;
86	__asm__ volatile("fnstsw %0" : "=ma" (status));
87	return(status);
88	}
89
90	#define fnclex() \
91	__asm__ volatile("fnclex")
92
55e303ae	93	#define fnsave(state) \
1c79356b A	94	__asm__ volatile("fnsave %0" : "=m" (*state))
	95
	96	#define frstor(state) \
	97	__asm__ volatile("frstor %0" : : "m" (state))
	98
	99	#define fwait() \
	100	__asm__("fwait");
	101
55e303ae A	102	#define fxrstor(addr) __asm("fxrstor %0" : : "m" (*(addr)))
	103	#define fxsave(addr) __asm __volatile("fxsave %0" : "=m" (*(addr)))
	104
	105	#define FXSAFE() (fp_kind == FP_FXSR)
1c79356b A	106
	107	#define fpu_load_context(pcb)
	108
	109	/*
	110	* Save thread`s FPU context.
	111	* If only one CPU, we just set the task-switched bit,
	112	* to keep the new thread from using the coprocessor.
	113	* If multiple CPUs, we save the entire state.
55e303ae A	114	* NOTE: in order to provide backwards compatible support in the kernel. When saving SSE2 state, we also save the
55e303ae A	115	* FP state in it's old location. Otherwise fpu_get_state() and fpu_set_state() will stop working
1c79356b A	116	*/
	117	#if NCPUS > 1
	118	#define fpu_save_context(thread) \
	119	{ \
	120	register struct i386_fpsave_state *ifps; \
	121	ifps = (thread)->top_act->mact.pcb->ims.ifps; \
	122	if (ifps != 0 && !ifps->fp_valid) { \
	123	/* registers are in FPU - save to memory */ \
	124	ifps->fp_valid = TRUE; \
55e303ae A	125	ifps->fp_save_flavor = FP_387; \
	126	if (FXSAFE()) { \
	127	fxsave(&ifps->fx_save_state); \
	128	ifps->fp_save_flavor = FP_FXSR; \
	129	} \
	130	fnsave(&ifps->fp_save_state); \
1c79356b A	131	} \
	132	set_ts(); \
	133	}
	134
	135	#else /* NCPUS == 1 */
	136	#define fpu_save_context(thread) \
	137	{ \
	138	set_ts(); \
	139	}
	140
	141	#endif /* NCPUS == 1 */
	142
	143
	144	extern int fp_kind;
	145
	146	extern void init_fpu(void);
	147	extern void fpu_module_init(void);
	148	extern void fp_free(
	149	struct i386_fpsave_state * fps);
	150	extern kern_return_t fpu_set_state(
	151	thread_act_t thr_act,
	152	struct i386_float_state * st);
	153	extern kern_return_t fpu_get_state(
	154	thread_act_t thr_act,
	155	struct i386_float_state * st);
55e303ae A	156	/* extern kern_return_t fpu_set_fxstate(
	157	thread_act_t thr_act,
	158	struct i386_float_state * st);
	159	extern kern_return_t fpu_get_fxstate(
	160	thread_act_t thr_act,
	161	struct i386_float_state * st); */
1c79356b A	162	extern void fpnoextflt(void);
	163	extern void fpextovrflt(void);
	164	extern void fpexterrflt(void);
	165	extern void fp_state_alloc(void);
	166	extern void fpintr(void);
	167	extern void fpflush(thread_act_t);
	168
	169	#endif /* _I386_FPU_H_ */