/*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)npx.h 5.3 (Berkeley) 1/18/91 * $FreeBSD: src/sys/i386/include/npx.h,v 1.29.2.1 2006/07/01 00:57:55 davidxu Exp $ */ /* * 287/387 NPX Coprocessor Data Structures and Constants * W. Jolitz 1/90 */ #ifndef _MACHINE_NPX_H_ #define _MACHINE_NPX_H_ /* Environment information of floating point unit */ struct env87 { long en_cw; /* control word (16bits) */ long en_sw; /* status word (16bits) */ long en_tw; /* tag word (16bits) */ long en_fip; /* floating point instruction pointer */ u_short en_fcs; /* floating code segment selector */ u_short en_opcode; /* opcode last executed (11 bits ) */ long en_foo; /* floating operand offset */ long en_fos; /* floating operand segment selector */ }; /* Contents of each floating point accumulator */ struct fpacc87 { #ifdef dontdef /* too unportable */ u_long fp_mantlo; /* mantissa low (31:0) */ u_long fp_manthi; /* mantissa high (63:32) */ int fp_exp:15; /* exponent */ int fp_sgn:1; /* mantissa sign */ #else u_char fp_bytes[10]; #endif }; /* Floating point context */ struct save87 { struct env87 sv_env; /* floating point control/status */ struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */ u_char sv_pad0[4]; /* padding for (now unused) saved status word */ /* * Bogus padding for emulators. Emulators should use their own * struct and arrange to store into this struct (ending here) * before it is inspected for ptracing or for core dumps. Some * emulators overwrite the whole struct. We have no good way of * knowing how much padding to leave. Leave just enough for the * GPL emulator's i387_union (176 bytes total). */ u_char sv_pad[64]; /* padding; used by emulators */ }; struct envxmm { u_int16_t en_cw; /* control word (16bits) */ u_int16_t en_sw; /* status word (16bits) */ u_int16_t en_tw; /* tag word (16bits) */ u_int16_t en_opcode; /* opcode last executed (11 bits ) */ u_int32_t en_fip; /* floating point instruction pointer */ u_int16_t en_fcs; /* floating code segment selector */ u_int16_t en_pad0; /* padding */ u_int32_t en_foo; /* floating operand offset */ u_int16_t en_fos; /* floating operand segment selector */ u_int16_t en_pad1; /* padding */ u_int32_t en_mxcsr; /* SSE sontorol/status register */ u_int32_t en_mxcsr_mask; /* valid bits in mxcsr */ }; /* Contents of each SSE extended accumulator */ struct xmmacc { u_char xmm_bytes[16]; }; struct savexmm { struct envxmm sv_env; struct { struct fpacc87 fp_acc; u_char fp_pad[6]; /* padding */ } sv_fp[8]; struct xmmacc sv_xmm[8]; u_char sv_pad[224]; } __aligned(16); union savefpu { struct save87 sv_87; struct savexmm sv_xmm; }; /* * The hardware default control word for i387's and later coprocessors is * 0x37F, giving: * * round to nearest * 64-bit precision * all exceptions masked. * * We modify the affine mode bit and precision bits in this to give: * * affine mode for 287's (if they work at all) (1 in bitfield 1<<12) * 53-bit precision (2 in bitfield 3<<8) * * 64-bit precision often gives bad results with high level languages * because it makes the results of calculations depend on whether * intermediate values are stored in memory or in FPU registers. */ #define __INITIAL_NPXCW__ 0x127F #define __INITIAL_MXCSR__ 0x1F80 #ifdef _KERNEL #define IO_NPX 0x0F0 /* Numeric Coprocessor */ #define IO_NPXSIZE 16 /* 80387/80487 NPX registers */ #define IRQ_NPX 13 /* full reset on some systems, NOP on others */ #define npx_full_reset() outb(IO_NPX + 1, 0) int npxdna(void); void npxdrop(void); void npxexit(struct thread *td); int npxformat(void); int npxgetregs(struct thread *td, union savefpu *addr); void npxinit(u_short control); void npxsave(union savefpu *addr); void npxsetregs(struct thread *td, union savefpu *addr); int npxtrap(void); #endif #endif /* !_MACHINE_NPX_H_ */