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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Russell Kingb66da4a2005-07-17 10:54:50 +010032#define GET_USERREG() ((struct pt_regs *)(THREAD_START_SP + (unsigned long)current_thread_info()) - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/thread_info.h>
35
36/* includes */
37#include "fpsr.h" /* FP control and status register definitions */
38#include "milieu.h"
Richard Purdief148af22005-08-03 19:49:17 +010039
40struct roundingData {
41 int8 mode;
42 int8 precision;
43 signed char exception;
44};
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include "softfloat.h"
47
48#define typeNone 0x00
49#define typeSingle 0x01
50#define typeDouble 0x02
51#define typeExtended 0x03
52
53/*
54 * This must be no more and no less than 12 bytes.
55 */
56typedef union tagFPREG {
57 float32 fSingle;
58 float64 fDouble;
59#ifdef CONFIG_FPE_NWFPE_XP
60 floatx80 fExtended;
61#else
Lennert Buytenhekbedf1422005-11-07 21:12:08 +000062 u32 padding[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#endif
Nicolas Pitre8993a442006-01-14 16:36:50 +000064} __attribute__ ((packed,aligned(4))) FPREG;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66/*
67 * FPA11 device model.
68 *
69 * This structure is exported to user space. Do not re-order.
70 * Only add new stuff to the end, and do not change the size of
71 * any element. Elements of this structure are used by user
72 * space, and must match struct user_fp in include/asm-arm/user.h.
73 * We include the byte offsets below for documentation purposes.
74 *
75 * The size of this structure and FPREG are checked by fpmodule.c
76 * on initialisation. If the rules have been broken, NWFPE will
77 * not initialise.
78 */
79typedef struct tagFPA11 {
80/* 0 */ FPREG fpreg[8]; /* 8 floating point registers */
81/* 96 */ FPSR fpsr; /* floating point status register */
82/* 100 */ FPCR fpcr; /* floating point control register */
83/* 104 */ unsigned char fType[8]; /* type of floating point value held in
84 floating point registers. One of
85 none, single, double or extended. */
86/* 112 */ int initflag; /* this is special. The kernel guarantees
87 to set it to 0 when a thread is launched,
88 so we can use it to detect whether this
89 instance of the emulator needs to be
90 initialised. */
Nicolas Pitre8993a442006-01-14 16:36:50 +000091} __attribute__ ((packed,aligned(4))) FPA11;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Richard Purdief148af22005-08-03 19:49:17 +010093extern int8 SetRoundingMode(const unsigned int);
94extern int8 SetRoundingPrecision(const unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095extern void nwfpe_init_fpa(union fp_state *fp);
96
Ben Dooks6ec5e7f2005-10-12 19:58:10 +010097extern unsigned int EmulateAll(unsigned int opcode);
98
99extern unsigned int EmulateCPDT(const unsigned int opcode);
100extern unsigned int EmulateCPDO(const unsigned int opcode);
101extern unsigned int EmulateCPRT(const unsigned int opcode);
102
103/* fpa11_cpdt.c */
104extern unsigned int PerformLDF(const unsigned int opcode);
105extern unsigned int PerformSTF(const unsigned int opcode);
106extern unsigned int PerformLFM(const unsigned int opcode);
107extern unsigned int PerformSFM(const unsigned int opcode);
108
109/* single_cpdo.c */
110
111extern unsigned int SingleCPDO(struct roundingData *roundData,
112 const unsigned int opcode, FPREG * rFd);
113/* double_cpdo.c */
114extern unsigned int DoubleCPDO(struct roundingData *roundData,
115 const unsigned int opcode, FPREG * rFd);
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#endif