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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_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 <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
 */
#define	fpu_save_context(thread) \
    { \
	register struct i386_fpsave_state *ifps; \
	ifps = (thread)->machine.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(); \
    }
	    

extern int	fp_kind;

extern void		init_fpu(void);
extern void		fpu_module_init(void);
extern void		fpu_free(
				struct i386_fpsave_state	* fps);
extern kern_return_t	fpu_set_state(
				thread_t			thr_act,
				struct i386_float_state		* st);
extern kern_return_t	fpu_get_state(
				thread_t			thr_act,
				struct i386_float_state		* st);
extern kern_return_t	fpu_set_fxstate(
				thread_t			thr_act,
				struct i386_float_state		* st);
extern kern_return_t	fpu_get_fxstate(
				thread_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_t);

#endif	/* _I386_FPU_H_ */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* @OSF_COPYRIGHT@
	30	*/
	31	/*
	32	* Mach Operating System
	33	* Copyright (c) 1991 Carnegie Mellon University
	34	* All Rights Reserved.
	35	*
	36	* Permission to use, copy, modify and distribute this software and its
	37	* documentation is hereby granted, provided that both the copyright
	38	* notice and this permission notice appear in all copies of the
	39	* software, derivative works or modified versions, and any portions
	40	* thereof, and that both notices appear in supporting documentation.
	41	*
	42	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	43	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	44	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	45	*
	46	* Carnegie Mellon requests users of this software to return to
	47	*
	48	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	49	* School of Computer Science
	50	* Carnegie Mellon University
	51	* Pittsburgh PA 15213-3890
	52	*
	53	* any improvements or extensions that they make and grant Carnegie Mellon
	54	* the rights to redistribute these changes.
	55	*/
	56
	57	/*
	58	*/
	59
	60	#ifndef _I386_FPU_H_
	61	#define _I386_FPU_H_
	62
	63	/*
	64	* Macro definitions for routines to manipulate the
	65	* floating-point processor.
	66	*/
8f6c56a5 A	67
8f6c56a5 A	68	#include <i386/proc_reg.h>
1c79356b A	69	#include <i386/thread.h>
	70	#include <kern/kern_types.h>
	71	#include <mach/i386/kern_return.h>
	72	#include <mach/i386/thread_status.h>
	73
	74	/*
	75	* FPU instructions.
	76	*/
	77	#define fninit() \
	78	__asm__ volatile("fninit")
	79
	80	#define fnstcw(control) \
	81	__asm__("fnstcw %0" : "=m" ((unsigned short )(control)))
	82
	83	#define fldcw(control) \
	84	__asm__ volatile("fldcw %0" : : "m" ((unsigned short ) &(control)) )
	85
	86	extern unsigned short fnstsw(void);
	87
	88	extern __inline__ unsigned short fnstsw(void)
	89	{
	90	unsigned short status;
	91	__asm__ volatile("fnstsw %0" : "=ma" (status));
	92	return(status);
	93	}
	94
	95	#define fnclex() \
	96	__asm__ volatile("fnclex")
	97
55e303ae	98	#define fnsave(state) \
1c79356b A	99	__asm__ volatile("fnsave %0" : "=m" (*state))
	100
	101	#define frstor(state) \
	102	__asm__ volatile("frstor %0" : : "m" (state))
	103
	104	#define fwait() \
	105	__asm__("fwait");
	106
55e303ae A	107	#define fxrstor(addr) __asm("fxrstor %0" : : "m" (*(addr)))
	108	#define fxsave(addr) __asm __volatile("fxsave %0" : "=m" (*(addr)))
	109
	110	#define FXSAFE() (fp_kind == FP_FXSR)
1c79356b	111
8f6c56a5	112	#define fpu_load_context(pcb)
1c79356b A	113
	114	/*
	115	* Save thread`s FPU context.
8f6c56a5 A	116	* If only one CPU, we just set the task-switched bit,
	117	* to keep the new thread from using the coprocessor.
	118	* If multiple CPUs, we save the entire state.
	119	* NOTE: in order to provide backwards compatible support in the kernel. When saving SSE2 state, we also save the
	120	* FP state in it's old location. Otherwise fpu_get_state() and fpu_set_state() will stop working
1c79356b	121	*/
8f6c56a5 A	122	#define fpu_save_context(thread) \
	123	{ \
	124	register struct i386_fpsave_state *ifps; \
	125	ifps = (thread)->machine.pcb->ims.ifps; \
	126	if (ifps != 0 && !ifps->fp_valid) { \
	127	/* registers are in FPU - save to memory */ \
	128	ifps->fp_valid = TRUE; \
	129	ifps->fp_save_flavor = FP_387; \
	130	if (FXSAFE()) { \
	131	fxsave(&ifps->fx_save_state); \
	132	ifps->fp_save_flavor = FP_FXSR; \
	133	} \
	134	fnsave(&ifps->fp_save_state); \
	135	} \
	136	set_ts(); \
	137	}
	138
	139
	140
	141	extern int fp_kind;
1c79356b	142
8f6c56a5 A	143	extern void init_fpu(void);
	144	extern void fpu_module_init(void);
	145	extern void fpu_free(
	146	struct i386_fpsave_state * fps);
	147	extern kern_return_t fpu_set_state(
	148	thread_t thr_act,
	149	struct i386_float_state * st);
	150	extern kern_return_t fpu_get_state(
	151	thread_t thr_act,
	152	struct i386_float_state * st);
	153	extern kern_return_t fpu_set_fxstate(
	154	thread_t thr_act,
	155	struct i386_float_state * st);
	156	extern kern_return_t fpu_get_fxstate(
	157	thread_t thr_act,
	158	struct i386_float_state * st);
	159	extern void fpnoextflt(void);
	160	extern void fpextovrflt(void);
	161	extern void fpexterrflt(void);
	162	extern void fp_state_alloc(void);
	163	extern void fpintr(void);
	164	extern void fpflush(thread_t);
1c79356b A	165
1c79356b A	166	#endif /* _I386_FPU_H_ */