94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
|
/*
|
||
|
|
NetWinder Floating Point Emulator
|
||
|
|
(c) Rebel.com, 1998-1999
|
||
|
|
|
||
|
|
Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
|
||
|
|
|
||
|
|
This program is free software; you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 2 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
This program is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program; if not, write to the Free Software
|
||
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __FPA11_H__
|
||
|
|
#define __FPA11_H__
|
||
|
|
|
||
|
|
#define GET_FPA11() ((FPA11 *)(¤t_thread_info()->fpstate))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The processes registers are always at the very top of the 8K
|
||
|
|
* stack+task struct. Use the same method as 'current' uses to
|
||
|
|
* reach them.
|
||
|
|
*/
|
||
|
|
register unsigned long *user_registers asm("sl");
|
||
|
|
|
||
|
|
#define GET_USERREG() (user_registers)
|
||
|
|
|
||
|
|
#include <linux/config.h>
|
||
|
|
#include <linux/thread_info.h>
|
||
|
|
|
||
|
|
/* includes */
|
||
|
|
#include "fpsr.h" /* FP control and status register definitions */
|
||
|
|
#include "milieu.h"
|
||
|
|
#include "softfloat.h"
|
||
|
|
|
||
|
|
#define typeNone 0x00
|
||
|
|
#define typeSingle 0x01
|
||
|
|
#define typeDouble 0x02
|
||
|
|
#define typeExtended 0x03
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This must be no more and no less than 12 bytes.
|
||
|
|
*/
|
||
|
|
typedef union tagFPREG {
|
||
|
|
float32 fSingle;
|
||
|
|
float64 fDouble;
|
||
|
|
#ifdef CONFIG_FPE_NWFPE_XP
|
||
|
|
floatx80 fExtended;
|
||
|
|
#else
|
||
|
|
int padding[3];
|
||
|
|
#endif
|
||
|
|
} FPREG;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* FPA11 device model.
|
||
|
|
*
|
||
|
|
* This structure is exported to user space. Do not re-order.
|
||
|
|
* Only add new stuff to the end, and do not change the size of
|
||
|
|
* any element. Elements of this structure are used by user
|
||
|
|
* space, and must match struct user_fp in include/asm-arm/user.h.
|
||
|
|
* We include the byte offsets below for documentation purposes.
|
||
|
|
*
|
||
|
|
* The size of this structure and FPREG are checked by fpmodule.c
|
||
|
|
* on initialisation. If the rules have been broken, NWFPE will
|
||
|
|
* not initialise.
|
||
|
|
*/
|
||
|
|
typedef struct tagFPA11 {
|
||
|
|
/* 0 */ FPREG fpreg[8]; /* 8 floating point registers */
|
||
|
|
/* 96 */ FPSR fpsr; /* floating point status register */
|
||
|
|
/* 100 */ FPCR fpcr; /* floating point control register */
|
||
|
|
/* 104 */ unsigned char fType[8]; /* type of floating point value held in
|
||
|
|
floating point registers. One of
|
||
|
|
none, single, double or extended. */
|
||
|
|
/* 112 */ int initflag; /* this is special. The kernel guarantees
|
||
|
|
to set it to 0 when a thread is launched,
|
||
|
|
so we can use it to detect whether this
|
||
|
|
instance of the emulator needs to be
|
||
|
|
initialised. */
|
||
|
|
} FPA11;
|
||
|
|
|
||
|
|
extern void SetRoundingMode(const unsigned int);
|
||
|
|
extern void SetRoundingPrecision(const unsigned int);
|
||
|
|
extern void nwfpe_init_fpa(union fp_state *fp);
|
||
|
|
|
||
|
|
#endif
|