fpa11.h
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上传日期:2013-04-10
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- /*
- 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.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 int *user_registers asm("sl");
- #define GET_USERREG() (user_registers)
- /* Need task_struct */
- #include <linux/sched.h>
- /* includes */
- #include "fpsr.h" /* FP control and status register definitions */
- #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 {
- floatx80 fExtended;
- float64 fDouble;
- float32 fSingle;
- } 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 resetFPA11(void);
- extern void SetRoundingMode(const unsigned int);
- extern void SetRoundingPrecision(const unsigned int);
- #endif