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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)npx.h 5.3 (Berkeley) 1/18/91 37 * $FreeBSD$ 38 */ 39 40 /* 41 * 287/387 NPX Coprocessor Data Structures and Constants 42 * W. Jolitz 1/90 43 */ 44 45 #ifndef _MACHINE_NPX_H_ 46 #define _MACHINE_NPX_H_ 47 48 /* Contents of each x87 floating point accumulator */ 49 struct fpacc87 { 50 u_char fp_bytes[10]; 51 }; 52 53 /* Contents of each SSE extended accumulator */ 54 struct xmmacc { 55 u_char xmm_bytes[16]; 56 }; 57 58 struct envxmm { 59 u_int16_t en_cw; /* control word (16bits) */ 60 u_int16_t en_sw; /* status word (16bits) */ 61 u_int8_t en_tw; /* tag word (8bits) */ 62 u_int8_t en_zero; 63 u_int16_t en_opcode; /* opcode last executed (11 bits ) */ 64 u_int64_t en_rip; /* floating point instruction pointer */ 65 u_int64_t en_rdp; /* floating operand pointer */ 66 u_int32_t en_mxcsr; /* SSE sontorol/status register */ 67 u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */ 68 }; 69 70 struct savefpu { 71 struct envxmm sv_env; 72 struct { 73 struct fpacc87 fp_acc; 74 u_char fp_pad[6]; /* padding */ 75 } sv_fp[8]; 76 struct xmmacc sv_xmm[16]; 77 u_char sv_pad[96]; 78 } __aligned(16); 79 80 /* 81 * The hardware default control word for i387's and later coprocessors is 82 * 0x37F, giving: 83 * 84 * round to nearest 85 * 64-bit precision 86 * all exceptions masked. 87 * 88 * FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc 89 * because of the difference between memory and fpu register stack arguments. 90 * If its using an intermediate fpu register, it has 80/64 bits to work 91 * with. If it uses memory, it has 64/53 bits to work with. However, 92 * gcc is aware of this and goes to a fair bit of trouble to make the 93 * best use of it. 94 * 95 * This is mostly academic for AMD64, because the ABI prefers the use 96 * SSE2 based math. For FreeBSD/amd64, we go with the default settings. 97 */ 98 #define __INITIAL_NPXCW__ 0x037F 99 #define __INITIAL_MXCSR__ 0x1F80 100 #define __INITIAL_MXCSR_MASK__ 0xFFBF 101 102 #ifdef _KERNEL 103 int npxdna(void); 104 void npxdrop(void); 105 void npxexit(struct thread *td); 106 int npxformat(void); 107 int npxgetregs(struct thread *td, struct savefpu *addr); 108 void npxinit(u_short control); 109 void npxsave(struct savefpu *addr); 110 void npxsetregs(struct thread *td, struct savefpu *addr); 111 int npxtrap(void); 112 #endif 113 114 #endif /* !_MACHINE_NPX_H_ */ 115