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Diffstat (limited to 'kernel/arch/arm/nwfpe/fpa11.h')
| -rw-r--r-- | kernel/arch/arm/nwfpe/fpa11.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/kernel/arch/arm/nwfpe/fpa11.h b/kernel/arch/arm/nwfpe/fpa11.h new file mode 100644 index 000000000..d3a6f9298 --- /dev/null +++ b/kernel/arch/arm/nwfpe/fpa11.h @@ -0,0 +1,121 @@ +/* + 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. + */ +#define GET_USERREG() ((struct pt_regs *)(THREAD_START_SP + (unsigned long)current_thread_info()) - 1) + +#include <linux/thread_info.h> + +/* includes */ +#include "fpsr.h" /* FP control and status register definitions */ +#include "milieu.h" + +struct roundingData { + int8 mode; + int8 precision; + signed char exception; +}; + +#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 + u32 padding[3]; +#endif +} __attribute__ ((packed,aligned(4))) 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 <asm/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. */ +} __attribute__ ((packed,aligned(4))) FPA11; + +extern int8 SetRoundingMode(const unsigned int); +extern int8 SetRoundingPrecision(const unsigned int); +extern void nwfpe_init_fpa(union fp_state *fp); + +extern unsigned int EmulateAll(unsigned int opcode); + +extern unsigned int EmulateCPDT(const unsigned int opcode); +extern unsigned int EmulateCPDO(const unsigned int opcode); +extern unsigned int EmulateCPRT(const unsigned int opcode); + +/* fpa11_cpdt.c */ +extern unsigned int PerformLDF(const unsigned int opcode); +extern unsigned int PerformSTF(const unsigned int opcode); +extern unsigned int PerformLFM(const unsigned int opcode); +extern unsigned int PerformSFM(const unsigned int opcode); + +/* single_cpdo.c */ + +extern unsigned int SingleCPDO(struct roundingData *roundData, + const unsigned int opcode, FPREG * rFd); +/* double_cpdo.c */ +extern unsigned int DoubleCPDO(struct roundingData *roundData, + const unsigned int opcode, FPREG * rFd); + +/* extneded_cpdo.c */ +extern unsigned int ExtendedCPDO(struct roundingData *roundData, + const unsigned int opcode, FPREG * rFd); + +#endif |