1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * Copyright (c) 2008 The DragonFly Project. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)npx.h 5.3 (Berkeley) 1/18/91 34 * $FreeBSD: src/sys/i386/include/npx.h,v 1.18.2.1 2001/08/15 01:23:52 peter Exp $ 35 */ 36 37 /* 38 * 287/387 NPX Coprocessor Data Structures and Constants 39 * W. Jolitz 1/90 40 */ 41 42 #ifndef _CPU_NPX_H_ 43 #define _CPU_NPX_H_ 44 45 #ifndef _SYS_TYPES_H_ 46 #include <sys/types.h> 47 #endif 48 49 /* Environment information of floating point unit */ 50 struct env87 { 51 int32_t en_cw; /* control word (16bits) */ 52 int32_t en_sw; /* status word (16bits) */ 53 int32_t en_tw; /* tag word (16bits) */ 54 int32_t en_fip; /* floating point instruction pointer */ 55 u_short en_fcs; /* floating code segment selector */ 56 u_short en_opcode; /* opcode last executed (11 bits ) */ 57 int32_t en_foo; /* floating operand offset */ 58 int32_t en_fos; /* floating operand segment selector */ 59 }; 60 61 /* Contents of each floating point accumulator */ 62 struct fpacc87 { 63 #ifdef dontdef /* too unportable */ 64 u_int32_t fp_mantlo; /* mantissa low (31:0) */ 65 u_int32_t fp_manthi; /* mantissa high (63:32) */ 66 int fp_exp:15; /* exponent */ 67 int fp_sgn:1; /* mantissa sign */ 68 #else 69 u_char fp_bytes[10]; 70 #endif 71 }; 72 73 /* Floating point context */ 74 struct save87 { 75 struct env87 sv_env; /* floating point control/status */ 76 struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */ 77 u_int32_t sv_unused001; 78 /* 79 * Bogus padding for emulators. Emulators should use their own 80 * struct and arrange to store into this struct (ending here) 81 * before it is inspected for ptracing or for core dumps. Some 82 * emulators overwrite the whole struct. We have no good way of 83 * knowing how much padding to leave. Leave just enough for the 84 * GPL emulator's i387_union (176 bytes total). 85 */ 86 u_char sv_pad[64]; /* padding; used by emulators */ 87 }; 88 89 struct envxmm { 90 u_int16_t en_cw; /* control word (16bits) */ 91 u_int16_t en_sw; /* status word (16bits) */ 92 u_int16_t en_tw; /* tag word (16bits) */ 93 u_int16_t en_opcode; /* opcode last executed (11 bits ) */ 94 u_int32_t en_fip; /* floating point instruction pointer */ 95 u_int16_t en_fcs; /* floating code segment selector */ 96 u_int16_t en_pad0; /* padding */ 97 u_int32_t en_foo; /* floating operand offset */ 98 u_int16_t en_fos; /* floating operand segment selector */ 99 u_int16_t en_pad1; /* padding */ 100 u_int32_t en_mxcsr; /* SSE sontorol/status register */ 101 u_int32_t en_pad2; /* padding */ 102 }; 103 104 /* Contents of each SSE extended accumulator */ 105 struct xmmacc { 106 u_char xmm_bytes[16]; 107 }; 108 109 /* 110 * savexmm is a 512-byte structure 111 */ 112 struct savexmm { 113 struct envxmm sv_env; /* 32 */ 114 struct { 115 struct fpacc87 fp_acc; /* 10 */ 116 u_char fp_pad[6]; /* 6 (padding) */ 117 } sv_fp[8]; 118 struct xmmacc sv_xmm[8]; /* 128 */ 119 u_int32_t sv_unused001; 120 u_char sv_pad[220]; 121 } __attribute__((aligned(16))); 122 123 struct saveymm { 124 u_char xsavedata[832]; 125 } __attribute__((aligned(64))); 126 127 union savefpu { 128 struct save87 sv_87; 129 struct savexmm sv_xmm; 130 struct saveymm sv_ymm; 131 char sv_savearea[1024]; /* see mcontext_t */ 132 }; 133 134 /* 135 * The hardware default control word for i387's and later coprocessors is 136 * 0x37F, giving: 137 * 138 * round to nearest 139 * 64-bit precision 140 * all exceptions masked. 141 * 142 * We modify the affine mode bit and precision bits in this to give: 143 * 144 * affine mode for 287's (if they work at all) (1 in bitfield 1<<12) 145 * 53-bit precision (2 in bitfield 3<<8) 146 * 147 * 64-bit precision often gives bad results with high level languages 148 * because it makes the results of calculations depend on whether 149 * intermediate values are stored in memory or in FPU registers. 150 */ 151 #define __INITIAL_NPXCW__ 0x127F 152 153 #define __INITIAL_FPUCW__ 0x037F /* used by libm/arch/x86_64/fenv.c */ 154 #define __INITIAL_FPUCW_I386__ 0x127F 155 #define __INITIAL_MXCSR__ 0x1F80 /* used by libm/arch/x86_64/fenv.c */ 156 #define __INITIAL_MXCSR_MASK__ 0xFFBF 157 158 #ifdef _KERNEL 159 160 struct proc; 161 struct trapframe; 162 163 extern uint32_t npx_mxcsr_mask; 164 165 void npxprobemask (void); 166 void npxexit (void); 167 void npxinit (void); 168 void npxsave (union savefpu *addr); 169 #endif 170 171 #endif /* !_CPU_NPX_H_ */ 172