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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)npx.h 5.3 (Berkeley) 1/18/91 33 * $FreeBSD$ 34 */ 35 36 /* 37 * 287/387 NPX Coprocessor Data Structures and Constants 38 * W. Jolitz 1/90 39 */ 40 41 #ifndef _MACHINE_NPX_H_ 42 #define _MACHINE_NPX_H_ 43 44 /* Environment information of floating point unit */ 45 struct env87 { 46 long en_cw; /* control word (16bits) */ 47 long en_sw; /* status word (16bits) */ 48 long en_tw; /* tag word (16bits) */ 49 long en_fip; /* floating point instruction pointer */ 50 u_short en_fcs; /* floating code segment selector */ 51 u_short en_opcode; /* opcode last executed (11 bits ) */ 52 long en_foo; /* floating operand offset */ 53 long en_fos; /* floating operand segment selector */ 54 }; 55 56 /* Contents of each floating point accumulator */ 57 struct fpacc87 { 58 #ifdef dontdef /* too unportable */ 59 u_long fp_mantlo; /* mantissa low (31:0) */ 60 u_long fp_manthi; /* mantissa high (63:32) */ 61 int fp_exp:15; /* exponent */ 62 int fp_sgn:1; /* mantissa sign */ 63 #else 64 u_char fp_bytes[10]; 65 #endif 66 }; 67 68 /* Floating point context */ 69 struct save87 { 70 struct env87 sv_env; /* floating point control/status */ 71 struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */ 72 u_char sv_pad0[4]; /* padding for (now unused) saved status word */ 73 /* 74 * Bogus padding for emulators. Emulators should use their own 75 * struct and arrange to store into this struct (ending here) 76 * before it is inspected for ptracing or for core dumps. Some 77 * emulators overwrite the whole struct. We have no good way of 78 * knowing how much padding to leave. Leave just enough for the 79 * GPL emulator's i387_union (176 bytes total). 80 */ 81 u_char sv_pad[64]; /* padding; used by emulators */ 82 }; 83 84 struct envxmm { 85 u_int16_t en_cw; /* control word (16bits) */ 86 u_int16_t en_sw; /* status word (16bits) */ 87 u_int16_t en_tw; /* tag word (16bits) */ 88 u_int16_t en_opcode; /* opcode last executed (11 bits ) */ 89 u_int32_t en_fip; /* floating point instruction pointer */ 90 u_int16_t en_fcs; /* floating code segment selector */ 91 u_int16_t en_pad0; /* padding */ 92 u_int32_t en_foo; /* floating operand offset */ 93 u_int16_t en_fos; /* floating operand segment selector */ 94 u_int16_t en_pad1; /* padding */ 95 u_int32_t en_mxcsr; /* SSE control/status register */ 96 u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */ 97 }; 98 99 /* Contents of each SSE extended accumulator */ 100 struct xmmacc { 101 u_char xmm_bytes[16]; 102 }; 103 104 struct savexmm { 105 struct envxmm sv_env; 106 struct { 107 struct fpacc87 fp_acc; 108 u_char fp_pad[6]; /* padding */ 109 } sv_fp[8]; 110 struct xmmacc sv_xmm[8]; 111 u_char sv_pad[224]; 112 } __aligned(16); 113 114 union savefpu { 115 struct save87 sv_87; 116 struct savexmm sv_xmm; 117 }; 118 119 /* 120 * The hardware default control word for i387's and later coprocessors is 121 * 0x37F, giving: 122 * 123 * round to nearest 124 * 64-bit precision 125 * all exceptions masked. 126 * 127 * We modify the affine mode bit and precision bits in this to give: 128 * 129 * affine mode for 287's (if they work at all) (1 in bitfield 1<<12) 130 * 53-bit precision (2 in bitfield 3<<8) 131 * 132 * 64-bit precision often gives bad results with high level languages 133 * because it makes the results of calculations depend on whether 134 * intermediate values are stored in memory or in FPU registers. 135 */ 136 #define __INITIAL_NPXCW__ 0x127F 137 #define __INITIAL_MXCSR__ 0x1F80 138 139 #ifdef _KERNEL 140 141 #define IO_NPX 0x0F0 /* Numeric Coprocessor */ 142 #define IO_NPXSIZE 16 /* 80387/80487 NPX registers */ 143 144 #define IRQ_NPX 13 145 146 /* full reset on some systems, NOP on others */ 147 #define npx_full_reset() outb(IO_NPX + 1, 0) 148 149 int npxdna(void); 150 void npxdrop(void); 151 void npxexit(struct thread *td); 152 int npxformat(void); 153 int npxgetregs(struct thread *td, union savefpu *addr); 154 void npxinit(u_short control); 155 void npxsave(union savefpu *addr); 156 void npxsetregs(struct thread *td, union savefpu *addr); 157 int npxtrap(void); 158 159 #endif 160 161 #endif /* !_MACHINE_NPX_H_ */ 162