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#define GET_FPA11() ((FPA11 *)(&current->thread.fpstate))
26
27/*
28 * The processes registers are always at the very top of the 8K
29 * stack+task struct.  Use the same method as 'current' uses to
30 * reach them.
31 */
32register unsigned int *user_registers asm("sl");
33
34#define GET_USERREG() (user_registers)
35
36/* Need task_struct */
37#include <linux/sched.h>
38
39/* includes */
40#include "fpsr.h"		/* FP control and status register definitions */
41#include "softfloat.h"
42
43#define		typeNone		0x00
44#define		typeSingle		0x01
45#define		typeDouble		0x02
46#define		typeExtended		0x03
47
48/*
49 * This must be no more and no less than 12 bytes.
50 */
51typedef union tagFPREG {
52   floatx80 fExtended;
53   float64  fDouble;
54   float32  fSingle;
55} FPREG;
56
57/*
58 * FPA11 device model.
59 *
60 * This structure is exported to user space.  Do not re-order.
61 * Only add new stuff to the end, and do not change the size of
62 * any element.  Elements of this structure are used by user
63 * space, and must match struct user_fp in include/asm-arm/user.h.
64 * We include the byte offsets below for documentation purposes.
65 *
66 * The size of this structure and FPREG are checked by fpmodule.c
67 * on initialisation.  If the rules have been broken, NWFPE will
68 * not initialise.
69 */
70typedef struct tagFPA11 {
71/*   0 */  FPREG fpreg[8];		/* 8 floating point registers */
72/*  96 */  FPSR fpsr;			/* floating point status register */
73/* 100 */  FPCR fpcr;			/* floating point control register */
74/* 104 */  unsigned char fType[8];	/* type of floating point value held in
75					   floating point registers.  One of none
76					   single, double or extended. */
77/* 112 */  int initflag;		/* this is special.  The kernel guarantees
78					   to set it to 0 when a thread is launched,
79					   so we can use it to detect whether this
80					   instance of the emulator needs to be
81					   initialised. */
82} FPA11;
83
84extern void resetFPA11(void);
85extern void SetRoundingMode(const unsigned int);
86extern void SetRoundingPrecision(const unsigned int);
87
88#endif
89