lint

[unix-history] / usr / src / sys / i386 / include / npx.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)npx.h	5.3 (Berkeley) %G%
 */

/*
 * 287/387 NPX Coprocessor Data Structures and Constants
 * W. Jolitz 1/90
 */

#ifndef	___NPX87___
#define	___NPX87___

/* Environment information of floating point unit */
struct	env87 {
	long	en_cw;		/* control word (16bits) */
	long	en_sw;		/* status word (16bits) */
	long	en_tw;		/* tag word (16bits) */
	long	en_fip;		/* floating point instruction pointer */
	u_short	en_fcs;		/* floating code segment selector */
	u_short	en_opcode;	/* opcode last executed (11 bits ) */
	long	en_foo;		/* floating operand offset */
	long	en_fos;		/* floating operand segment selector */
};

/* Contents of each floating point accumulator */
struct	fpacc87 {
	u_long	fp_mantlo;	/* mantissa low (31:0) */
	u_long	fp_manthi;	/* mantissa high (63:32) */
	int	fp_exp:15;	/* exponent */
	int	fp_sgn:1;	/* mantissa sign */
};

/* Floating point context */
struct	save87 {
	struct	env87 sv_env;		/* floating point control/status */
	struct	fpacc87	sv_ac[8];	/* accumulator contents, 0-7 */
};

/* Cyrix EMC memory - mapped coprocessor context switch information */
struct	emcsts {
	long	em_msw;		/* memory mapped status register when swtched */
	long	em_tar;		/* memory mapped temp A register when swtched */
	long	em_dl;		/* memory mapped D low register when swtched */
};
#endif	___NPX87___