usr/src/sys/sparc/include/fsr.h

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Lawrence Berkeley Laboratory.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 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.
 *
 *      @(#)fsr.h       8.1 (Berkeley) 6/11/93
 *
 * from: $Header: fsr.h,v 1.6 92/11/26 02:04:36 torek Exp $
 */

#ifndef _MACHINE_FSR_H_
#define _MACHINE_FSR_H_

/*
 * Bits in FSR.
 */
#define FSR_RD          0xc0000000      /* rounding direction */
#define   FSR_RD_RN     0               /* round to nearest */
#define   FSR_RD_RZ     1               /* round towards 0 */
#define   FSR_RD_RP     2               /* round towards +inf */
#define   FSR_RD_RM     3               /* round towards -inf */
#define FSR_RD_SHIFT    30
#define FSR_RD_MASK     0x03

#define FSR_RP          0x30000000      /* extended rounding precision */
#define   FSR_RP_X      0               /* extended stays extended */
#define   FSR_RP_S      1               /* extended => single */
#define   FSR_RP_D      2               /* extended => double */
#define   FSR_RP_80     3               /* extended => 80-bit */
#define FSR_RP_SHIFT    28
#define FSR_RP_MASK     0x03

#define FSR_TEM         0x0f800000      /* trap enable mask */
#define FSR_TEM_SHIFT   23
#define FSR_TEM_MASK    0x1f

#define FSR_NS          0x00400000      /* ``nonstandard mode'' */
#define FSR_AU          0x00400000      /* aka abrupt underflow mode */
#define FSR_MBZ         0x00300000      /* reserved; must be zero */

#define FSR_VER         0x000e0000      /* version bits */
#define FSR_VER_SHIFT   17
#define FSR_VER_MASK    0x07

#define FSR_FTT         0x0001c000      /* FP trap type */
#define   FSR_TT_NONE   0               /* no trap */
#define   FSR_TT_IEEE   1               /* IEEE exception */
#define   FSR_TT_UNFIN  2               /* unfinished operation */
#define   FSR_TT_UNIMP  3               /* unimplemented operation */
#define   FSR_TT_SEQ    4               /* sequence error */
#define   FSR_TT_HWERR  5               /* hardware error (unrecoverable) */
#define FSR_FTT_SHIFT   14
#define FSR_FTT_MASK    0x03

#define FSR_QNE         0x00002000      /* queue not empty */
#define FSR_PR          0x00001000      /* partial result */

#define FSR_FCC         0x00000c00      /* FP condition codes */
#define   FSR_CC_EQ     0               /* f1 = f2 */
#define   FSR_CC_LT     1               /* f1 < f2 */
#define   FSR_CC_GT     2               /* f1 > f2 */
#define   FSR_CC_UO     3               /* (f1,f2) unordered */
#define FSR_FCC_SHIFT   10
#define FSR_FCC_MASK    0x03

#define FSR_AX  0x000003e0              /* accrued exceptions */
#define   FSR_AX_SHIFT  5
#define   FSR_AX_MASK   0x1f
#define FSR_CX  0x0000001f              /* current exceptions */
#define   FSR_CX_SHIFT  0
#define   FSR_CX_MASK   0x1f

/* The following exceptions apply to TEM, AX, and CX. */
#define FSR_NV  0x10                    /* invalid operand */
#define FSR_OF  0x08                    /* overflow */
#define FSR_UF  0x04                    /* underflow */
#define FSR_DZ  0x02                    /* division by zero */
#define FSR_NX  0x01                    /* inexact result */

#endif /* _MACHINE_FSR_H_ */