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 #define __aligned(x) __attribute__((__aligned__(x))) 45 46 /* Environment information of floating point unit */ 47 struct env87 { 48 long en_cw; /* control word (16bits) */ 49 long en_sw; /* status word (16bits) */ 50 long en_tw; /* tag word (16bits) */ 51 long en_fip; /* floating point instruction pointer */ 52 u_short en_fcs; /* floating code segment selector */ 53 u_short en_opcode; /* opcode last executed (11 bits ) */ 54 long en_foo; /* floating operand offset */ 55 long en_fos; /* floating operand segment selector */ 56 }; 57 58 /* Contents of each floating point accumulator */ 59 struct fpacc87 { 60 #ifdef dontdef /* too unportable */ 61 u_long fp_mantlo; /* mantissa low (31:0) */ 62 u_long fp_manthi; /* mantissa high (63:32) */ 63 int fp_exp:15; /* exponent */ 64 int fp_sgn:1; /* mantissa sign */ 65 #else 66 u_char fp_bytes[10]; 67 #endif 68 }; 69 70 /* Floating point context */ 71 struct save87 { 72 struct env87 sv_env; /* floating point control/status */ 73 struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */ 74 u_char sv_pad0[4]; /* padding for (now unused) saved status word */ 75 /* 76 * Bogus padding for emulators. Emulators should use their own 77 * struct and arrange to store into this struct (ending here) 78 * before it is inspected for ptracing or for core dumps. Some 79 * emulators overwrite the whole struct. We have no good way of 80 * knowing how much padding to leave. Leave just enough for the 81 * GPL emulator's i387_union (176 bytes total). 82 */ 83 u_char sv_pad[64]; /* padding; used by emulators */ 84 }; 85 86 struct envxmm { 87 uint16 en_cw; /* control word (16bits) */ 88 uint16 en_sw; /* status word (16bits) */ 89 uint16 en_tw; /* tag word (16bits) */ 90 uint16 en_opcode; /* opcode last executed (11 bits ) */ 91 uint32 en_fip; /* floating point instruction pointer */ 92 uint16 en_fcs; /* floating code segment selector */ 93 uint16 en_pad0; /* padding */ 94 uint32 en_foo; /* floating operand offset */ 95 uint16 en_fos; /* floating operand segment selector */ 96 uint16 en_pad1; /* padding */ 97 uint32 en_mxcsr; /* SSE control/status register */ 98 uint32 en_mxcsr_mask; /* valid bits in mxcsr */ 99 }; 100 101 /* Contents of each SSE extended accumulator */ 102 struct xmmacc { 103 u_char xmm_bytes[16]; 104 }; 105 106 struct savexmm { 107 struct envxmm sv_env; 108 struct { 109 struct fpacc87 fp_acc; 110 u_char fp_pad[6]; /* padding */ 111 } sv_fp[8]; 112 struct xmmacc sv_xmm[8]; 113 u_char sv_pad[224]; 114 } __aligned(16); 115 116 union savefpu { 117 struct save87 sv_87; 118 struct savexmm sv_xmm; 119 }; 120 121 /* 122 * The hardware default control word for i387's and later coprocessors is 123 * 0x37F, giving: 124 * 125 * round to nearest 126 * 64-bit precision 127 * all exceptions masked. 128 * 129 * We modify the affine mode bit and precision bits in this to give: 130 * 131 * affine mode for 287's (if they work at all) (1 in bitfield 1<<12) 132 * 53-bit precision (2 in bitfield 3<<8) 133 * 134 * 64-bit precision often gives bad results with high level languages 135 * because it makes the results of calculations depend on whether 136 * intermediate values are stored in memory or in FPU registers. 137 */ 138 #define __INITIAL_NPXCW__ 0x127F 139 #define __INITIAL_MXCSR__ 0x1F80 140 141 #ifdef _KERNEL 142 143 #define IO_NPX 0x0F0 /* Numeric Coprocessor */ 144 #define IO_NPXSIZE 16 /* 80387/80487 NPX registers */ 145 146 #define IRQ_NPX 13 147 148 /* full reset on some systems, NOP on others */ 149 #define npx_full_reset() outb(IO_NPX + 1, 0) 150 151 int npxdna(void); 152 void npxdrop(void); 153 void npxexit(struct thread *td); 154 int npxformat(void); 155 int npxgetregs(struct thread *td, union savefpu *addr); 156 void npxinit(void); 157 void npxsave(union savefpu *addr); 158 void npxsetregs(struct thread *td, union savefpu *addr); 159 int npxtrap(void); 160 161 #endif 162 163 #endif /* !_MACHINE_NPX_H_ */ 164