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. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)npx.h 5.3 (Berkeley) 1/18/91 38 * $FreeBSD: src/sys/i386/include/npx.h,v 1.18.2.1 2001/08/15 01:23:52 peter Exp $ 39 */ 40 41 /* 42 * 287/387 NPX Coprocessor Data Structures and Constants 43 * W. Jolitz 1/90 44 */ 45 46 #ifndef _CPU_NPX_H_ 47 #define _CPU_NPX_H_ 48 49 #ifndef _SYS_TYPES_H_ 50 #include <sys/types.h> 51 #endif 52 53 /* Environment information of floating point unit */ 54 struct env87 { 55 int32_t en_cw; /* control word (16bits) */ 56 int32_t en_sw; /* status word (16bits) */ 57 int32_t en_tw; /* tag word (16bits) */ 58 int32_t en_fip; /* floating point instruction pointer */ 59 u_short en_fcs; /* floating code segment selector */ 60 u_short en_opcode; /* opcode last executed (11 bits ) */ 61 int32_t en_foo; /* floating operand offset */ 62 int32_t en_fos; /* floating operand segment selector */ 63 }; 64 65 /* Contents of each floating point accumulator */ 66 struct fpacc87 { 67 #ifdef dontdef /* too unportable */ 68 u_int32_t fp_mantlo; /* mantissa low (31:0) */ 69 u_int32_t fp_manthi; /* mantissa high (63:32) */ 70 int fp_exp:15; /* exponent */ 71 int fp_sgn:1; /* mantissa sign */ 72 #else 73 u_char fp_bytes[10]; 74 #endif 75 }; 76 77 /* Floating point context */ 78 struct save87 { 79 struct env87 sv_env; /* floating point control/status */ 80 struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */ 81 u_int32_t sv_unused001; 82 /* 83 * Bogus padding for emulators. Emulators should use their own 84 * struct and arrange to store into this struct (ending here) 85 * before it is inspected for ptracing or for core dumps. Some 86 * emulators overwrite the whole struct. We have no good way of 87 * knowing how much padding to leave. Leave just enough for the 88 * GPL emulator's i387_union (176 bytes total). 89 */ 90 u_char sv_pad[64]; /* padding; used by emulators */ 91 }; 92 93 struct envxmm { 94 u_int16_t en_cw; /* control word (16bits) */ 95 u_int16_t en_sw; /* status word (16bits) */ 96 u_int16_t en_tw; /* tag word (16bits) */ 97 u_int16_t en_opcode; /* opcode last executed (11 bits ) */ 98 u_int32_t en_fip; /* floating point instruction pointer */ 99 u_int16_t en_fcs; /* floating code segment selector */ 100 u_int16_t en_pad0; /* padding */ 101 u_int32_t en_foo; /* floating operand offset */ 102 u_int16_t en_fos; /* floating operand segment selector */ 103 u_int16_t en_pad1; /* padding */ 104 u_int32_t en_mxcsr; /* SSE sontorol/status register */ 105 u_int32_t en_pad2; /* padding */ 106 }; 107 108 /* Contents of each SSE extended accumulator */ 109 struct xmmacc { 110 u_char xmm_bytes[16]; 111 }; 112 113 /* 114 * savexmm is a 512-byte structure 115 */ 116 struct savexmm { 117 struct envxmm sv_env; /* 32 */ 118 struct { 119 struct fpacc87 fp_acc; /* 10 */ 120 u_char fp_pad[6]; /* 6 (padding) */ 121 } sv_fp[8]; 122 struct xmmacc sv_xmm[8]; /* 128 */ 123 u_int32_t sv_unused001; 124 u_char sv_pad[220]; 125 } __attribute__((aligned(16))); 126 127 struct saveymm { 128 u_char xsavedata[832]; 129 } __attribute__((aligned(64))); 130 131 union savefpu { 132 struct save87 sv_87; 133 struct savexmm sv_xmm; 134 struct saveymm sv_ymm; 135 char sv_savearea[1024]; /* see mcontext_t */ 136 }; 137 138 /* 139 * The hardware default control word for i387's and later coprocessors is 140 * 0x37F, giving: 141 * 142 * round to nearest 143 * 64-bit precision 144 * all exceptions masked. 145 * 146 * We modify the affine mode bit and precision bits in this to give: 147 * 148 * affine mode for 287's (if they work at all) (1 in bitfield 1<<12) 149 * 53-bit precision (2 in bitfield 3<<8) 150 * 151 * 64-bit precision often gives bad results with high level languages 152 * because it makes the results of calculations depend on whether 153 * intermediate values are stored in memory or in FPU registers. 154 */ 155 #define __INITIAL_NPXCW__ 0x127F 156 157 #define __INITIAL_FPUCW__ 0x037F /* used by libm/arch/x86_64/fenv.c */ 158 #define __INITIAL_FPUCW_I386__ 0x127F 159 #define __INITIAL_MXCSR__ 0x1F80 /* used by libm/arch/x86_64/fenv.c */ 160 #define __INITIAL_MXCSR_MASK__ 0xFFBF 161 162 #ifdef _KERNEL 163 164 struct proc; 165 struct trapframe; 166 167 extern uint32_t npx_mxcsr_mask; 168 169 void npxprobemask (void); 170 void npxexit (void); 171 void npxinit (void); 172 void npxsave (union savefpu *addr); 173 #endif 174 175 #endif /* !_CPU_NPX_H_ */ 176