![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to npx.h CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Net/2] / Net2 / arch / i386 / include|
Return to npx.h CVS log | Up to [Net/2] / Net2 / arch / i386 / include |
1.1 root 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: *
1.1.1.3 ! root 36: * from: @(#)npx.h 5.3 (Berkeley) 1/18/91
! 37: * npx.h,v 1.3 1993/05/22 08:00:23 cgd Exp
1.1 root 38: */
39:
40: /*
41: * 287/387 NPX Coprocessor Data Structures and Constants
42: * W. Jolitz 1/90
43: */
44:
45: #ifndef ___NPX87___
46: #define ___NPX87___
47:
48: /* Environment information of floating point unit */
49: struct env87 {
50: long en_cw; /* control word (16bits) */
51: long en_sw; /* status word (16bits) */
52: long en_tw; /* tag word (16bits) */
53: long en_fip; /* floating point instruction pointer */
54: u_short en_fcs; /* floating code segment selector */
55: u_short en_opcode; /* opcode last executed (11 bits ) */
56: long en_foo; /* floating operand offset */
57: long en_fos; /* floating operand segment selector */
58: };
59:
60: /* Contents of each floating point accumulator */
61: struct fpacc87 {
1.1.1.3 ! root 62: #ifdef dontdef /* too unportable */
1.1 root 63: u_long fp_mantlo; /* mantissa low (31:0) */
64: u_long fp_manthi; /* mantissa high (63:32) */
65: int fp_exp:15; /* exponent */
66: int fp_sgn:1; /* mantissa sign */
1.1.1.3 ! root 67: #else
! 68: u_char fp_bytes[10];
! 69: #endif
1.1 root 70: };
71:
72: /* Floating point context */
73: struct save87 {
74: struct env87 sv_env; /* floating point control/status */
75: struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
1.1.1.3 ! root 76: #ifndef dontdef
! 77: u_long sv_ex_sw; /* status word for last exception (was pad) */
! 78: u_long sv_ex_tw; /* tag word for last exception (was pad) */
! 79: u_char sv_pad[8 * 2 - 2 * 4]; /* bogus historical padding */
! 80: #endif
1.1 root 81: };
82:
83: /* Cyrix EMC memory - mapped coprocessor context switch information */
84: struct emcsts {
85: long em_msw; /* memory mapped status register when swtched */
86: long em_tar; /* memory mapped temp A register when swtched */
87: long em_dl; /* memory mapped D low register when swtched */
88: };
1.1.1.2 root 89:
1.1.1.3 ! root 90: /* Intel prefers long real (53 bit) precision */
1.1.1.2 root 91: #define __iBCS_NPXCW__ 0x262
1.1.1.3 ! root 92: /* wfj prefers temporary real (64 bit) precision */
1.1.1.2 root 93: #define __386BSD_NPXCW__ 0x362
1.1.1.3 ! root 94: /*
! 95: * bde prefers 53 bit precision and all exceptions masked.
! 96: *
! 97: * The standard control word from finit is 0x37F, giving:
! 98: *
! 99: * round to nearest
! 100: * 64-bit precision
! 101: * all exceptions masked.
! 102: *
! 103: * Now I want:
! 104: *
! 105: * affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
! 106: * 53-bit precision (2 in bitfield 3<<8)
! 107: * overflow exception unmasked (0 in bitfield 1<<3)
! 108: * zero divide exception unmasked (0 in bitfield 1<<2)
! 109: * invalid-operand exception unmasked (0 in bitfield 1<<0).
! 110: *
! 111: * 64-bit precision often gives bad results with high level languages
! 112: * because it makes the results of calculations depend on whether
! 113: * intermediate values are stored in memory or in FPU registers.
! 114: *
! 115: * The "Intel" and wfj control words have:
! 116: *
! 117: * underflow exception unmasked (0 in bitfield 1<<4)
! 118: *
! 119: * but that causes an unexpected exception in the test program 'paranoia'
! 120: * and makes denormals useless (DBL_MIN / 2 underflows). It doesn't make
! 121: * a lot of sense to trap underflow without trapping denormals.
! 122: *
! 123: * Later I will want the IEEE default of all exceptions masked. See the
! 124: * 0.0 math manpage for why this is better. The 0.1 math manpage is empty.
! 125: */
! 126: #define __BDE_NPXCW__ 0x1272
! 127: #define __BETTER_BDE_NPXCW__ 0x127f
1.1.1.2 root 128:
1.1.1.3 ! root 129: #ifdef __BROKEN_NPXCW__
1.1.1.2 root 130: #ifdef __386BSD__
131: #define __INITIAL_NPXCW__ __386BSD_NPXCW__
132: #else
133: #define __INITIAL_NPXCW__ __iBCS_NPXCW__
134: #endif
1.1.1.3 ! root 135: #else
! 136: #define __INITIAL_NPXCW__ __BDE_NPXCW__
! 137: #endif
1.1.1.2 root 138:
1.1 root 139: #endif ___NPX87___
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.