/*- * 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 * $Id: npx.h,v 1.7 1995/01/03 03:57:46 bde Exp $ */ /* * 287/387 NPX Coprocessor Data Structures and Constants * W. Jolitz 1/90 */ #ifndef _MACHINE_NPX_H_ #define _MACHINE_NPX_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 #include #include struct proc; int npxdna __P((void)); void npxexit __P((struct proc *p)); void npxinit __P((int control)); void npxintr __P((struct intrframe frame)); void npxsave __P((struct save87 *addr)); #endif #endif /* !_MACHINE_NPX_H_ */