/*-
* 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_ */