File: /usr/src/linux/arch/arm/nwfpe/fpa11.h
1 /*
2 NetWinder Floating Point Emulator
3 (c) Rebel.com, 1998-1999
4
5 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #ifndef __FPA11_H__
23 #define __FPA11_H__
24
25 /* includes */
26 #include "fpsr.h" /* FP control and status register definitions */
27 #include "softfloat.h"
28
29 /* Need task_struct */
30 #include <linux/sched.h>
31
32 #define typeNone 0x00
33 #define typeSingle 0x01
34 #define typeDouble 0x02
35 #define typeExtended 0x03
36
37 typedef union tagFPREG {
38 float32 fSingle;
39 float64 fDouble;
40 floatx80 fExtended;
41 } FPREG;
42
43 /* FPA11 device model */
44 typedef struct tagFPA11 {
45 unsigned int *userRegisters;
46 FPREG fpreg[8]; /* 8 floating point registers */
47 FPSR fpsr; /* floating point status register */
48 FPCR fpcr; /* floating point control register */
49 unsigned char fType[8]; /* type of floating point value held in
50 floating point registers. One of none
51 single, double or extended. */
52 int initflag; /* this is special. The kernel guarantees
53 to set it to 0 when a thread is launched,
54 so we can use it to detect whether this
55 instance of the emulator needs to be
56 initialised. */
57 } FPA11;
58
59 extern void resetFPA11(void);
60 extern void SetRoundingMode(const unsigned int);
61 extern void SetRoundingPrecision(const unsigned int);
62
63 #define GET_FPA11() ((FPA11 *)(¤t->thread.fpstate))
64 #define GET_USERREG() (GET_FPA11()->userRegisters)
65
66 #endif
67