Source to osfmk/mach/i386/fp_reg.h

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/*
 * 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@
 */
/*
 * HISTORY
 * 
 * Revision 1.1.1.1  1998/09/22 21:05:31  wsanchez
 * Import of Mac OS X kernel (~semeria)
 *
 * Revision 1.1.1.1  1998/03/07 02:25:47  wsanchez
 * Import of OSF Mach kernel (~mburg)
 *
 * Revision 1.2.6.1  1994/09/23  02:37:03  ezf
 * 	change marker to not FREE
 * 	[1994/09/22  21:39:57  ezf]
 *
 * Revision 1.2.2.2  1993/06/09  02:40:30  gm
 * 	Added to OSF/1 R1.3 from NMK15.0.
 * 	[1993/06/02  21:16:11  jeffc]
 * 
 * Revision 1.2  1993/04/19  16:33:51  devrcs
 * 	ansi C conformance changes
 * 	[1993/02/02  18:56:01  david]
 * 
 * Revision 1.1  1992/09/30  02:30:43  robert
 * 	Initial revision
 * 
 * $EndLog$
 */
/* CMU_HIST */
/*
 * Revision 2.1.1.1.2.1  92/03/03  16:21:23  jeffreyh
 * 	Merged up to Trunk
 * 	[92/02/26            jeffreyh]
 * 
 * Revision 2.4  92/02/26  13:10:29  elf
 * 	Added stupid alaises to make i386/fpu.c compile. RVB will fix.
 * 	 
 * 	[92/02/26            elf]
 * 
 * Revision 2.3  92/02/26  12:47:46  elf
 * 	Installed from i386 directory.
 * 	[92/02/26            danner]
 * 
 * 
 * Revision 2.2  92/01/03  20:19:47  dbg
 * 	Move this file to mach/i386.  Add FP_NO..FP_387 codes for
 * 	floating-point processor status.  Error bits in control
 * 	register are masks, not enables.
 * 	[91/10/19            dbg]
 * 
 */
/* CMU_ENDHIST */
/* 
 * Mach Operating System
 * Copyright (c) 1992-1989 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  [email protected]
 *  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_FP_SAVE_H_
#define	_I386_FP_SAVE_H_
/*
 *	Floating point registers and status, as saved
 *	and restored by FP save/restore instructions.
 */
struct i386_fp_save	{
	unsigned short	fp_control;	/* control */
	unsigned short	fp_unused_1;
	unsigned short	fp_status;	/* status */
	unsigned short	fp_unused_2;
	unsigned short	fp_tag;		/* register tags */
	unsigned short	fp_unused_3;
	unsigned int	fp_eip;		/* eip at failed instruction */
	unsigned short	fp_cs;		/* cs at failed instruction */
	unsigned short	fp_opcode;	/* opcode of failed instruction */
	unsigned int	fp_dp;		/* data address */
	unsigned short	fp_ds;		/* data segment */
	unsigned short	fp_unused_4;
};

struct i386_fp_regs {
	unsigned short	fp_reg_word[5][8];
					/* space for 8 80-bit FP registers */
};

/*
 * Control register
 */
#define	FPC_IE		0x0001		/* enable invalid operation
					   exception */
#define FPC_IM		FPC_IE
#define	FPC_DE		0x0002		/* enable denormalized operation
					   exception */
#define FPC_DM		FPC_DE
#define	FPC_ZE		0x0004		/* enable zero-divide exception */
#define FPC_ZM		FPC_ZE
#define	FPC_OE		0x0008		/* enable overflow exception */
#define FPC_OM		FPC_OE
#define	FPC_UE		0x0010		/* enable underflow exception */
#define	FPC_PE		0x0020		/* enable precision exception */
#define	FPC_PC		0x0300		/* precision control: */
#define	FPC_PC_24	0x0000			/* 24 bits */
#define	FPC_PC_53	0x0200			/* 53 bits */
#define	FPC_PC_64	0x0300			/* 64 bits */
#define	FPC_RC		0x0c00		/* rounding control: */
#define	FPC_RC_RN	0x0000			/* round to nearest or even */
#define	FPC_RC_RD	0x0400			/* round down */
#define	FPC_RC_RU	0x0800			/* round up */
#define	FPC_RC_CHOP	0x0c00			/* chop */
#define	FPC_IC		0x1000		/* infinity control (obsolete) */
#define	FPC_IC_PROJ	0x0000			/* projective infinity */
#define	FPC_IC_AFF	0x1000			/* affine infinity (std) */

/*
 * Status register
 */
#define	FPS_IE		0x0001		/* invalid operation */
#define	FPS_DE		0x0002		/* denormalized operand */
#define	FPS_ZE		0x0004		/* divide by zero */
#define	FPS_OE		0x0008		/* overflow */
#define	FPS_UE		0x0010		/* underflow */
#define	FPS_PE		0x0020		/* precision */
#define	FPS_SF		0x0040		/* stack flag */
#define	FPS_ES		0x0080		/* error summary */
#define	FPS_C0		0x0100		/* condition code bit 0 */
#define	FPS_C1		0x0200		/* condition code bit 1 */
#define	FPS_C2		0x0400		/* condition code bit 2 */
#define	FPS_TOS		0x3800		/* top-of-stack pointer */
#define	FPS_TOS_SHIFT	11
#define	FPS_C3		0x4000		/* condition code bit 3 */
#define	FPS_BUSY	0x8000		/* FPU busy */

/*
 * Kind of floating-point support provided by kernel.
 */
#define	FP_NO		0		/* no floating point */
#define	FP_SOFT		1		/* software FP emulator */
#define	FP_287		2		/* 80287 */
#define	FP_387		3		/* 80387 or 80486 */

#endif	/* _I386_FP_SAVE_H_ */