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 * Floating Point Data Structures and Constants 38 * W. Jolitz 1/90 39 */ 40 41 #ifndef _MACHINE_FPU_H_ 42 #define _MACHINE_FPU_H_ 43 44 /* Contents of each x87 floating point accumulator */ 45 struct fpacc87 { 46 u_char fp_bytes[10]; 47 }; 48 49 /* Contents of each SSE extended accumulator */ 50 struct xmmacc { 51 u_char xmm_bytes[16]; 52 }; 53 54 struct envxmm { 55 u_int16_t en_cw; /* control word (16bits) */ 56 u_int16_t en_sw; /* status word (16bits) */ 57 u_int8_t en_tw; /* tag word (8bits) */ 58 u_int8_t en_zero; 59 u_int16_t en_opcode; /* opcode last executed (11 bits ) */ 60 u_int64_t en_rip; /* floating point instruction pointer */ 61 u_int64_t en_rdp; /* floating operand pointer */ 62 u_int32_t en_mxcsr; /* SSE sontorol/status register */ 63 u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */ 64 }; 65 66 struct savefpu { 67 struct envxmm sv_env; 68 struct { 69 struct fpacc87 fp_acc; 70 u_char fp_pad[6]; /* padding */ 71 } sv_fp[8]; 72 struct xmmacc sv_xmm[16]; 73 u_char sv_pad[96]; 74 } __aligned(16); 75 76 /* 77 * The hardware default control word for i387's and later coprocessors is 78 * 0x37F, giving: 79 * 80 * round to nearest 81 * 64-bit precision 82 * all exceptions masked. 83 * 84 * FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc 85 * because of the difference between memory and fpu register stack arguments. 86 * If its using an intermediate fpu register, it has 80/64 bits to work 87 * with. If it uses memory, it has 64/53 bits to work with. However, 88 * gcc is aware of this and goes to a fair bit of trouble to make the 89 * best use of it. 90 * 91 * This is mostly academic for AMD64, because the ABI prefers the use 92 * SSE2 based math. For FreeBSD/amd64, we go with the default settings. 93 */ 94 #define __INITIAL_FPUCW__ 0x037F 95 #define __INITIAL_MXCSR__ 0x1F80 96 #define __INITIAL_MXCSR_MASK__ 0xFFBF 97 98 #ifdef _KERNEL 99 int fpudna(void); 100 void fpudrop(void); 101 void fpuexit(struct thread *td); 102 int fpuformat(void); 103 int fpugetregs(struct thread *td, struct savefpu *addr); 104 void fpuinit(void); 105 void fpusetregs(struct thread *td, struct savefpu *addr); 106 int fputrap(void); 107 #endif 108 109 #endif /* !_MACHINE_FPU_H_ */ 110