projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 4bd1c0bf WN |
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 | * %sccs.include.noredist.c% | |
| 9 | * | |
| 10 | * @(#)npx.h 5.1 (Berkeley) %G% | |
| 11 | */ | |
| 12 | ||
| fd04f4ca BJ |
13 | /* |
| 14 | * 287/387 Floating Point Data Structures and Constants | |
| 15 | * W. Jolitz 1/90 | |
| 16 | */ | |
| 17 | ||
| 18 | #ifndef ___FPU87___ | |
| 19 | #define ___FPU87___ | |
| 20 | ||
| 21 | /* Environment information of floating point unit */ | |
| 22 | struct env87 { | |
| 23 | long en_cw; /* control word (16bits) */ | |
| 24 | long en_sw; /* status word (16bits) */ | |
| 25 | long en_tw; /* tag word (16bits) */ | |
| 26 | long en_fip; /* floating point instruction pointer */ | |
| 27 | u_short en_fcs; /* floating code segment selector */ | |
| 28 | u_short en_opcode; /* opcode last executed (11 bits ) */ | |
| 29 | long en_foo; /* floating operand offset */ | |
| 30 | long en_fos; /* floating operand segment selector */ | |
| 31 | }; | |
| 32 | ||
| 33 | /* Contents of each floating point accumulator */ | |
| 34 | struct fpacc87 { | |
| 35 | u_long fp_mantlo; /* mantissa low (31:0) */ | |
| 36 | u_long fp_manthi; /* mantissa high (63:32) */ | |
| 37 | int fp_exp:15; /* exponent */ | |
| 38 | int fp_sgn:1; /* mantissa sign */ | |
| 39 | }; | |
| 40 | ||
| 41 | /* Floating point context */ | |
| 42 | struct save87 { | |
| 43 | struct env87 sv_env; /* floating point control/status */ | |
| 44 | struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */ | |
| 45 | }; | |
| 46 | ||
| 47 | #endif ___FPU87___ |