sys/arch/alpha/include/fpu.h

   1 /* $NetBSD: fpu.h,v 1.4 2001/04/26 03:10:46 ross Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001 Ross Harvey
   5  * All rights reserved.
   6  *
   7  * This software was written for NetBSD.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the NetBSD
  20  *      Foundation, Inc. and its contributors.
  21  * 4. Neither the name of The NetBSD Foundation nor the names of its
  22  *    contributors may be used to endorse or promote products derived
  23  *    from this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  26  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #ifndef _ALPHA_FPU_H_
  39 #define _ALPHA_FPU_H_
  40
  41 #define _FP_C_DEF(n) (1UL << (n))
  42
  43 /*
  44  * Most of these next definitions were moved from <ieeefp.h>. Apparently the
  45  * names happen to match those exported by Compaq and Linux from their fpu.h
  46  * files.
  47  */
  48
  49 #define FPCR_SUM        _FP_C_DEF(63)
  50 #define FPCR_INED       _FP_C_DEF(62)
  51 #define FPCR_UNFD       _FP_C_DEF(61)
  52 #define FPCR_UNDZ       _FP_C_DEF(60)
  53 #define FPCR_DYN(rm)    ((unsigned long)(rm) << 58)
  54 #define FPCR_IOV        _FP_C_DEF(57)
  55 #define FPCR_INE        _FP_C_DEF(56)
  56 #define FPCR_UNF        _FP_C_DEF(55)
  57 #define FPCR_OVF        _FP_C_DEF(54)
  58 #define FPCR_DZE        _FP_C_DEF(53)
  59 #define FPCR_INV        _FP_C_DEF(52)
  60 #define FPCR_OVFD       _FP_C_DEF(51)
  61 #define FPCR_DZED       _FP_C_DEF(50)
  62 #define FPCR_INVD       _FP_C_DEF(49)
  63 #define FPCR_DNZ        _FP_C_DEF(48)
  64 #define FPCR_DNOD       _FP_C_DEF(47)
  65
  66 #define FPCR_MIRRORED (FPCR_INE | FPCR_UNF | FPCR_OVF | FPCR_DZE | FPCR_INV)
  67 #define FPCR_MIR_START 52
  68
  69 /*
  70  * The AARM specifies the bit positions of the software word used for
  71  * user mode interface to the control and status of the kernel completion
  72  * routines. Although it largely just redefines the FPCR, it shuffles
  73  * the bit order. The names of the bits are defined in the AARM, and
  74  * the definition prefix can easily be determined from public domain
  75  * programs written to either the Compaq or Linux interfaces, which
  76  * appear to be identical.
  77  */
  78
  79 #define IEEE_STATUS_DNO _FP_C_DEF(22)
  80 #define IEEE_STATUS_INE _FP_C_DEF(21)
  81 #define IEEE_STATUS_UNF _FP_C_DEF(20)
  82 #define IEEE_STATUS_OVF _FP_C_DEF(19)
  83 #define IEEE_STATUS_DZE _FP_C_DEF(18)
  84 #define IEEE_STATUS_INV _FP_C_DEF(17)
  85
  86 #define IEEE_TRAP_ENABLE_DNO _FP_C_DEF(6)
  87 #define IEEE_TRAP_ENABLE_INE _FP_C_DEF(5)
  88 #define IEEE_TRAP_ENABLE_UNF _FP_C_DEF(4)
  89 #define IEEE_TRAP_ENABLE_OVF _FP_C_DEF(3)
  90 #define IEEE_TRAP_ENABLE_DZE _FP_C_DEF(2)
  91 #define IEEE_TRAP_ENABLE_INV _FP_C_DEF(1)
  92
  93 #define IEEE_INHERIT _FP_C_DEF(14)
  94 #define IEEE_MAP_UMZ _FP_C_DEF(13)
  95 #define IEEE_MAP_DMZ _FP_C_DEF(12)
  96
  97 #define FP_C_MIRRORED (IEEE_STATUS_INE | IEEE_STATUS_UNF | IEEE_STATUS_OVF\
  98                                 | IEEE_STATUS_DZE | IEEE_STATUS_INV)
  99 #define FP_C_MIR_START 17
 100
 101 #ifdef _KERNEL
 102
 103 #define FLD_MASK(len) ((1UL << (len)) - 1)
 104 #define FLD_CLEAR(obj, origin, len)     \
 105                 ((obj) & ~(FLD_MASK(len) << (origin)))
 106 #define FLD_INSERT(obj, origin, len, value)     \
 107                 (FLD_CLEAR(obj, origin, len) | (value) << origin)
 108
 109 #define FP_C_TO_NETBSD_MASK(fp_c)       ((fp_c) >> 1 & 0x3f)
 110 #define FP_C_TO_NETBSD_FLAG(fp_c)       ((fp_c) >> 17 & 0x3f)
 111 #define NETBSD_MASK_TO_FP_C(m)          (((m) & 0x3f) << 1)
 112 #define NETBSD_FLAG_TO_FP_C(s)          (((s) & 0x3f) << 17)
 113 #define CLEAR_FP_C_MASK(fp_c)           ((fp_c) & ~(0x3f << 1))
 114 #define CLEAR_FP_C_FLAG(fp_c)           ((fp_c) & ~(0x3f << 17))
 115 #define SET_FP_C_MASK(fp_c, m) (CLEAR_FP_C_MASK(fp_c) | NETBSD_MASK_TO_FP_C(m))
 116 #define SET_FP_C_FLAG(fp_c, m) (CLEAR_FP_C_FLAG(fp_c) | NETBSD_FLAG_TO_FP_C(m))
 117
 118 #endif
 119
 120 #endif