/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1992 NeXT Computer, Inc. * * Intel386 Family: Floating Point unit. * * HISTORY * * 5 October 1992 David E. Bohman at NeXT * Added names to previously unamed fields in the mantissa. * * 5 April 1992 David E. Bohman at NeXT * Created. */ /* * Data register. */ typedef struct fp_data_reg { unsigned short mant; unsigned short mant1 :16, mant2 :16, mant3 :16; unsigned short exp :15, sign :1; } fp_data_reg_t; /* * Data register stack. */ typedef struct fp_stack { fp_data_reg_t ST[8]; } fp_stack_t; /* * Register stack tag word. */ typedef struct fp_tag { unsigned short tag0 :2, tag1 :2, tag2 :2, tag3 :2, tag4 :2, tag5 :2, tag6 :2, tag7 :2; #define FP_TAG_VALID 0 #define FP_TAG_ZERO 1 #define FP_TAG_SPEC 2 #define FP_TAG_EMPTY 3 } fp_tag_t; /* * Status word. */ typedef struct fp_status { unsigned short invalid :1, denorm :1, zdiv :1, ovrfl :1, undfl :1, precis :1, stkflt :1, errsumm :1, c0 :1, c1 :1, c2 :1, tos :3, c3 :1, busy :1; } fp_status_t; /* * Control word. */ typedef struct fp_control { unsigned short invalid :1, denorm :1, zdiv :1, ovrfl :1, undfl :1, precis :1, :2, pc :2, #define FP_PREC_24B 0 #define FP_PREC_53B 2 #define FP_PREC_64B 3 rc :2, #define FP_RND_NEAR 0 #define FP_RND_DOWN 1 #define FP_RND_UP 2 #define FP_CHOP 3 /*inf*/ :1, :3; } fp_control_t; #import <architecture/i386/sel.h> /* * Floating point 'environment' * used by FSTENV/FLDENV instructions. */ typedef struct fp_env { fp_control_t control; unsigned short :16; fp_status_t status; unsigned short :16; fp_tag_t tag; unsigned short :16; unsigned int ip; sel_t cs; unsigned short opcode; unsigned int dp; sel_t ds; unsigned short :16; } fp_env_t; /* * Floating point state * used by FSAVE/FRSTOR instructions. */ typedef struct fp_state { fp_env_t environ; fp_stack_t stack; } fp_state_t;