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Diffstat (limited to 'arch/arm/nwfpe/fpa11.h')
-rw-r--r--arch/arm/nwfpe/fpa11.h93
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/fpa11.h b/arch/arm/nwfpe/fpa11.h
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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_info()->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 long *user_registers asm("sl");
33
34#define GET_USERREG() (user_registers)
35
36#include <linux/config.h>
37#include <linux/thread_info.h>
38
39/* includes */
40#include "fpsr.h" /* FP control and status register definitions */
41#include "milieu.h"
42#include "softfloat.h"
43
44#define typeNone 0x00
45#define typeSingle 0x01
46#define typeDouble 0x02
47#define typeExtended 0x03
48
49/*
50 * This must be no more and no less than 12 bytes.
51 */
52typedef union tagFPREG {
53 float32 fSingle;
54 float64 fDouble;
55#ifdef CONFIG_FPE_NWFPE_XP
56 floatx80 fExtended;
57#else
58 int padding[3];
59#endif
60} FPREG;
61
62/*
63 * FPA11 device model.
64 *
65 * This structure is exported to user space. Do not re-order.
66 * Only add new stuff to the end, and do not change the size of
67 * any element. Elements of this structure are used by user
68 * space, and must match struct user_fp in include/asm-arm/user.h.
69 * We include the byte offsets below for documentation purposes.
70 *
71 * The size of this structure and FPREG are checked by fpmodule.c
72 * on initialisation. If the rules have been broken, NWFPE will
73 * not initialise.
74 */
75typedef struct tagFPA11 {
76/* 0 */ FPREG fpreg[8]; /* 8 floating point registers */
77/* 96 */ FPSR fpsr; /* floating point status register */
78/* 100 */ FPCR fpcr; /* floating point control register */
79/* 104 */ unsigned char fType[8]; /* type of floating point value held in
80 floating point registers. One of
81 none, single, double or extended. */
82/* 112 */ int initflag; /* this is special. The kernel guarantees
83 to set it to 0 when a thread is launched,
84 so we can use it to detect whether this
85 instance of the emulator needs to be
86 initialised. */
87} FPA11;
88
89extern void SetRoundingMode(const unsigned int);
90extern void SetRoundingPrecision(const unsigned int);
91extern void nwfpe_init_fpa(union fp_state *fp);
92
93#endif