151 lines
5.3 KiB
C
151 lines
5.3 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)npx.h 5.3 (Berkeley) 1/18/91
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* 287/387 NPX Coprocessor Data Structures and Constants
|
|
* W. Jolitz 1/90
|
|
*/
|
|
|
|
#ifndef _MACHINE_NPX_H_
|
|
#define _MACHINE_NPX_H_
|
|
|
|
#include <machine/globals.h>
|
|
|
|
/* 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 {
|
|
#ifdef dontdef /* too unportable */
|
|
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 */
|
|
#else
|
|
u_char fp_bytes[10];
|
|
#endif
|
|
};
|
|
|
|
/* Floating point context */
|
|
struct save87 {
|
|
struct env87 sv_env; /* floating point control/status */
|
|
struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
|
|
u_long sv_ex_sw; /* status word for last exception */
|
|
/*
|
|
* Bogus padding for emulators. Emulators should use their own
|
|
* struct and arrange to store into this struct (ending here)
|
|
* before it is inspected for ptracing or for core dumps. Some
|
|
* emulators overwrite the whole struct. We have no good way of
|
|
* knowing how much padding to leave. Leave just enough for the
|
|
* GPL emulator's i387_union (176 bytes total).
|
|
*/
|
|
u_char sv_pad[64]; /* padding; used by emulators */
|
|
};
|
|
|
|
/* Intel prefers long real (53 bit) precision */
|
|
#define __iBCS_NPXCW__ 0x262
|
|
/* wfj prefers temporary real (64 bit) precision */
|
|
#define __386BSD_NPXCW__ 0x362
|
|
/*
|
|
* bde prefers 53 bit precision and all exceptions masked.
|
|
*
|
|
* The standard control word from finit is 0x37F, giving:
|
|
*
|
|
* round to nearest
|
|
* 64-bit precision
|
|
* all exceptions masked.
|
|
*
|
|
* Now I want:
|
|
*
|
|
* affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
|
|
* 53-bit precision (2 in bitfield 3<<8)
|
|
* overflow exception unmasked (0 in bitfield 1<<3)
|
|
* zero divide exception unmasked (0 in bitfield 1<<2)
|
|
* invalid-operand exception unmasked (0 in bitfield 1<<0).
|
|
*
|
|
* 64-bit precision often gives bad results with high level languages
|
|
* because it makes the results of calculations depend on whether
|
|
* intermediate values are stored in memory or in FPU registers.
|
|
*
|
|
* The "Intel" and wfj control words have:
|
|
*
|
|
* underflow exception unmasked (0 in bitfield 1<<4)
|
|
*
|
|
* but that causes an unexpected exception in the test program 'paranoia'
|
|
* and makes denormals useless (DBL_MIN / 2 underflows). It doesn't make
|
|
* a lot of sense to trap underflow without trapping denormals.
|
|
*
|
|
* Later I will want the IEEE default of all exceptions masked. See the
|
|
* 0.0 math manpage for why this is better. The 0.1 math manpage is empty.
|
|
*/
|
|
#define __BDE_NPXCW__ 0x1272
|
|
#define __BETTER_BDE_NPXCW__ 0x127f
|
|
|
|
#ifdef __BROKEN_NPXCW__
|
|
#ifdef __FreeBSD__
|
|
#define __INITIAL_NPXCW__ __386BSD_NPXCW__
|
|
#else
|
|
#define __INITIAL_NPXCW__ __iBCS_NPXCW__
|
|
#endif
|
|
#else
|
|
#define __INITIAL_NPXCW__ __BDE_NPXCW__
|
|
#endif
|
|
|
|
#ifdef KERNEL
|
|
#ifndef npxproc
|
|
extern struct proc *npxproc;
|
|
#endif
|
|
|
|
int npxdna __P((void));
|
|
void npxexit __P((struct proc *p));
|
|
void npxinit __P((int control));
|
|
void npxsave __P((struct save87 *addr));
|
|
#endif
|
|
|
|
#endif /* !_MACHINE_NPX_H_ */
|