fpu.h revision 79609
1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)npx.h 5.3 (Berkeley) 1/18/91 37 * $FreeBSD: head/sys/amd64/include/fpu.h 79609 2001-07-12 06:32:51Z peter $ 38 */ 39 40/* 41 * 287/387 NPX Coprocessor Data Structures and Constants 42 * W. Jolitz 1/90 43 */ 44 45#ifndef _MACHINE_NPX_H_ 46#define _MACHINE_NPX_H_ 47 48/* Environment information of floating point unit */ 49struct env87 { 50 long en_cw; /* control word (16bits) */ 51 long en_sw; /* status word (16bits) */ 52 long en_tw; /* tag word (16bits) */ 53 long en_fip; /* floating point instruction pointer */ 54 u_short en_fcs; /* floating code segment selector */ 55 u_short en_opcode; /* opcode last executed (11 bits ) */ 56 long en_foo; /* floating operand offset */ 57 long en_fos; /* floating operand segment selector */ 58}; 59 60/* Contents of each floating point accumulator */ 61struct fpacc87 { 62#ifdef dontdef /* too unportable */ 63 u_long fp_mantlo; /* mantissa low (31:0) */ 64 u_long fp_manthi; /* mantissa high (63:32) */ 65 int fp_exp:15; /* exponent */ 66 int fp_sgn:1; /* mantissa sign */ 67#else 68 u_char fp_bytes[10]; 69#endif 70}; 71 72/* Floating point context */ 73struct save87 { 74 struct env87 sv_env; /* floating point control/status */ 75 struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */ 76 u_long sv_ex_sw; /* status word for last exception */ 77 /* 78 * Bogus padding for emulators. Emulators should use their own 79 * struct and arrange to store into this struct (ending here) 80 * before it is inspected for ptracing or for core dumps. Some 81 * emulators overwrite the whole struct. We have no good way of 82 * knowing how much padding to leave. Leave just enough for the 83 * GPL emulator's i387_union (176 bytes total). 84 */ 85 u_char sv_pad[64]; /* padding; used by emulators */ 86}; 87 88struct envxmm { 89 u_int16_t en_cw; /* control word (16bits) */ 90 u_int16_t en_sw; /* status word (16bits) */ 91 u_int16_t en_tw; /* tag word (16bits) */ 92 u_int16_t en_opcode; /* opcode last executed (11 bits ) */ 93 u_int32_t en_fip; /* floating point instruction pointer */ 94 u_int16_t en_fcs; /* floating code segment selector */ 95 u_int16_t en_pad0; /* padding */ 96 u_int32_t en_foo; /* floating operand offset */ 97 u_int16_t en_fos; /* floating operand segment selector */ 98 u_int16_t en_pad1; /* padding */ 99 u_int32_t en_mxcsr; /* SSE sontorol/status register */ 100 u_int32_t en_pad2; /* padding */ 101}; 102 103/* Contents of each SSE extended accumulator */ 104struct xmmacc { 105 u_char xmm_bytes[16]; 106}; 107 108struct savexmm { 109 struct envxmm sv_env; 110 struct { 111 struct fpacc87 fp_acc; 112 u_char fp_pad[6]; /* padding */ 113 } sv_fp[8]; 114 struct xmmacc sv_xmm[8]; 115 u_long sv_ex_sw; /* status word for last exception */ 116 u_char sv_pad[220]; 117} __attribute__((aligned(16))); 118 119union savefpu { 120 struct save87 sv_87; 121 struct savexmm sv_xmm; 122}; 123 124/* 125 * The hardware default control word for i387's and later coprocessors is 126 * 0x37F, giving: 127 * 128 * round to nearest 129 * 64-bit precision 130 * all exceptions masked. 131 * 132 * We modify the affine mode bit and precision bits in this to give: 133 * 134 * affine mode for 287's (if they work at all) (1 in bitfield 1<<12) 135 * 53-bit precision (2 in bitfield 3<<8) 136 * 137 * 64-bit precision often gives bad results with high level languages 138 * because it makes the results of calculations depend on whether 139 * intermediate values are stored in memory or in FPU registers. 140 */ 141#define __INITIAL_NPXCW__ 0x127F 142 143#ifdef _KERNEL 144int npxdna __P((void)); 145void npxexit __P((struct proc *p)); 146void npxinit __P((int control)); 147void npxsave __P((union savefpu *addr)); 148int npxtrap __P((void)); 149#endif 150 151#endif /* !_MACHINE_NPX_H_ */ 152