| 1 | /*␊ |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * This file contains Original Code and/or Modifications of Original Code␊ |
| 7 | * as defined in and that are subject to the Apple Public Source License␊ |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in␊ |
| 9 | * compliance with the License. Please obtain a copy of the License at␊ |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this␊ |
| 11 | * file.␊ |
| 12 | * ␊ |
| 13 | * The Original Code and all software distributed under the License are␊ |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
| 18 | * Please see the License for the specific language governing rights and␊ |
| 19 | * limitations under the License.␊ |
| 20 | * ␊ |
| 21 | * @APPLE_LICENSE_HEADER_END@␊ |
| 22 | */␊ |
| 23 | /*␊ |
| 24 | * Copyright (c) 1992 NeXT Computer, Inc.␊ |
| 25 | *␊ |
| 26 | * Intel386 Family:␉Floating Point unit.␊ |
| 27 | *␊ |
| 28 | * HISTORY␊ |
| 29 | *␊ |
| 30 | * 5 October 1992 ? at NeXT␊ |
| 31 | *␉Added names to previously unamed fields in the mantissa.␊ |
| 32 | *␊ |
| 33 | * 5 April 1992 ? at NeXT␊ |
| 34 | *␉Created.␊ |
| 35 | */␊ |
| 36 | ␊ |
| 37 | #ifndef _ARCH_I386_FPU_H_␊ |
| 38 | #define _ARCH_I386_FPU_H_␊ |
| 39 | ␊ |
| 40 | /*␊ |
| 41 | * Data register.␊ |
| 42 | */␊ |
| 43 | ␊ |
| 44 | typedef struct fp_data_reg {␊ |
| 45 | unsigned short␉␉mant;␊ |
| 46 | unsigned short␉␉mant1␉:16,␊ |
| 47 | ␉␉␉␉mant2␉:16,␊ |
| 48 | ␉␉␉␉mant3␉:16;␊ |
| 49 | unsigned short␉␉exp␉:15,␊ |
| 50 | ␉␉␉ ␉sign␉:1;␊ |
| 51 | } fp_data_reg_t;␊ |
| 52 | ␊ |
| 53 | /*␊ |
| 54 | * Data register stack.␊ |
| 55 | */␊ |
| 56 | ␊ |
| 57 | typedef struct fp_stack {␊ |
| 58 | fp_data_reg_t␉␉ST[8];␊ |
| 59 | } fp_stack_t;␊ |
| 60 | ␊ |
| 61 | /*␊ |
| 62 | * Register stack tag word.␊ |
| 63 | */␊ |
| 64 | ␊ |
| 65 | typedef struct fp_tag {␊ |
| 66 | unsigned short␉␉tag0␉:2,␊ |
| 67 | ␉␉␉␉tag1␉:2,␊ |
| 68 | ␉␉␉␉tag2␉:2,␊ |
| 69 | ␉␉␉␉tag3␉:2,␊ |
| 70 | ␉␉␉␉tag4␉:2,␊ |
| 71 | ␉␉␉␉tag5␉:2,␊ |
| 72 | ␉␉␉␉tag6␉:2,␊ |
| 73 | ␉␉␉␉tag7␉:2;␊ |
| 74 | #define FP_TAG_VALID␉␉0␊ |
| 75 | #define FP_TAG_ZERO␉␉1␊ |
| 76 | #define FP_TAG_SPEC␉␉2␊ |
| 77 | #define FP_TAG_EMPTY␉␉3␊ |
| 78 | } fp_tag_t;␊ |
| 79 | ␊ |
| 80 | /*␊ |
| 81 | * Status word.␊ |
| 82 | */␊ |
| 83 | ␊ |
| 84 | typedef struct fp_status {␊ |
| 85 | unsigned short␉␉invalid␉:1,␊ |
| 86 | ␉␉␉␉denorm␉:1,␊ |
| 87 | ␉␉␉␉zdiv␉:1,␊ |
| 88 | ␉␉␉␉ovrfl␉:1,␊ |
| 89 | ␉␉␉␉undfl␉:1,␊ |
| 90 | ␉␉␉␉precis␉:1,␊ |
| 91 | ␉␉␉␉stkflt␉:1,␊ |
| 92 | ␉␉␉␉errsumm␉:1,␊ |
| 93 | ␉␉␉␉c0␉:1,␊ |
| 94 | ␉␉␉␉c1␉:1,␊ |
| 95 | ␉␉␉␉c2␉:1,␊ |
| 96 | ␉␉␉␉tos␉:3,␊ |
| 97 | ␉␉␉␉c3␉:1,␊ |
| 98 | ␉␉␉␉busy␉:1;␊ |
| 99 | } fp_status_t;␊ |
| 100 | ␊ |
| 101 | /*␊ |
| 102 | * Control word.␊ |
| 103 | */␊ |
| 104 | ␊ |
| 105 | typedef struct fp_control {␊ |
| 106 | unsigned short␉␉invalid␉:1,␊ |
| 107 | ␉␉␉␉denorm␉:1,␊ |
| 108 | ␉␉␉␉zdiv␉:1,␊ |
| 109 | ␉␉␉␉ovrfl␉:1,␊ |
| 110 | ␉␉␉␉undfl␉:1,␊ |
| 111 | ␉␉␉␉precis␉:1,␊ |
| 112 | ␉␉␉␉␉:2,␊ |
| 113 | ␉␉␉␉pc␉:2,␊ |
| 114 | #define FP_PREC_24B␉␉0␊ |
| 115 | #define␉FP_PREC_53B␉␉2␊ |
| 116 | #define FP_PREC_64B␉␉3␊ |
| 117 | ␉␉␉␉rc␉:2,␊ |
| 118 | #define FP_RND_NEAR␉␉0␊ |
| 119 | #define FP_RND_DOWN␉␉1␊ |
| 120 | #define FP_RND_UP␉␉2␊ |
| 121 | #define FP_CHOP␉␉␉3␊ |
| 122 | ␉␉␉␉/*inf*/␉:1,␊ |
| 123 | ␉␉␉␉␉:3;␊ |
| 124 | } fp_control_t;␊ |
| 125 | ␊ |
| 126 | #include <architecture/i386/sel.h>␊ |
| 127 | ␊ |
| 128 | /*␊ |
| 129 | * Floating point 'environment'␊ |
| 130 | * used by FSTENV/FLDENV instructions.␊ |
| 131 | */␊ |
| 132 | ␊ |
| 133 | typedef struct fp_env {␊ |
| 134 | fp_control_t␉␉control;␊ |
| 135 | unsigned short␉␉␉:16;␊ |
| 136 | fp_status_t␉␉␉status;␊ |
| 137 | unsigned short␉␉␉:16;␊ |
| 138 | fp_tag_t␉␉␉tag;␊ |
| 139 | unsigned short␉␉␉:16;␊ |
| 140 | unsigned int␉␉ip;␊ |
| 141 | sel_t␉␉␉cs;␊ |
| 142 | unsigned short␉␉opcode;␊ |
| 143 | unsigned int␉␉dp;␊ |
| 144 | sel_t␉␉␉ds;␊ |
| 145 | unsigned short␉␉␉:16;␊ |
| 146 | } fp_env_t;␊ |
| 147 | ␊ |
| 148 | /*␊ |
| 149 | * Floating point state␊ |
| 150 | * used by FSAVE/FRSTOR instructions.␊ |
| 151 | */␊ |
| 152 | ␊ |
| 153 | /*␊ |
| 154 | * To allow the the common idiom of:␊ |
| 155 | * #define environ (*_NSGetEnviron())␊ |
| 156 | * to be used these fields were renamed. Old code that that does␊ |
| 157 | * not use this idiom can use the old field names by defining␊ |
| 158 | * _ARCHITECTURE_I386_FPU_FPSTATE_LEGACY_FIELD_NAMES_ .␊ |
| 159 | */␊ |
| 160 | typedef struct fp_state {␊ |
| 161 | #if _ARCHITECTURE_I386_FPU_FPSTATE_LEGACY_FIELD_NAMES_␊ |
| 162 | fp_env_t␉␉␉environ;␊ |
| 163 | fp_stack_t␉␉␉stack;␊ |
| 164 | #else␊ |
| 165 | fp_env_t␉␉␉fp_environ;␊ |
| 166 | fp_stack_t␉␉␉fp_stack;␊ |
| 167 | #endif␊ |
| 168 | } fp_state_t;␊ |
| 169 | ␊ |
| 170 | #endif␉/* _ARCH_I386_FPU_H_ */␊ |
| 171 | |
