cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

fpa11.h (3350B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3    NetWinder Floating Point Emulator
      4    (c) Rebel.com, 1998-1999
      5    
      6    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
      7
      8*/
      9
     10#ifndef __FPA11_H__
     11#define __FPA11_H__
     12
     13#define GET_FPA11() ((FPA11 *)(&current_thread_info()->fpstate))
     14
     15/*
     16 * The processes registers are always at the very top of the 8K
     17 * stack+task struct.  Use the same method as 'current' uses to
     18 * reach them.
     19 */
     20#define GET_USERREG() ((struct pt_regs *)(THREAD_START_SP + (unsigned long)current_thread_info()) - 1)
     21
     22#include <linux/thread_info.h>
     23
     24/* includes */
     25#include "fpsr.h"		/* FP control and status register definitions */
     26#include "milieu.h"
     27
     28struct roundingData {
     29    int8 mode;
     30    int8 precision;
     31    signed char exception;
     32};
     33
     34#include "softfloat.h"
     35
     36#define		typeNone		0x00
     37#define		typeSingle		0x01
     38#define		typeDouble		0x02
     39#define		typeExtended		0x03
     40
     41/*
     42 * This must be no more and no less than 12 bytes.
     43 */
     44typedef union tagFPREG {
     45	float32 fSingle;
     46	float64 fDouble;
     47#ifdef CONFIG_FPE_NWFPE_XP
     48	floatx80 fExtended;
     49#else
     50	u32 padding[3];
     51#endif
     52} __attribute__ ((packed,aligned(4))) FPREG;
     53
     54/*
     55 * FPA11 device model.
     56 *
     57 * This structure is exported to user space.  Do not re-order.
     58 * Only add new stuff to the end, and do not change the size of
     59 * any element.  Elements of this structure are used by user
     60 * space, and must match struct user_fp in <asm/user.h>.
     61 * We include the byte offsets below for documentation purposes.
     62 *
     63 * The size of this structure and FPREG are checked by fpmodule.c
     64 * on initialisation.  If the rules have been broken, NWFPE will
     65 * not initialise.
     66 */
     67typedef struct tagFPA11 {
     68/*   0 */ FPREG fpreg[8];	/* 8 floating point registers */
     69/*  96 */ FPSR fpsr;		/* floating point status register */
     70/* 100 */ FPCR fpcr;		/* floating point control register */
     71/* 104 */ unsigned char fType[8];	/* type of floating point value held in
     72					   floating point registers.  One of
     73					   none, single, double or extended. */
     74/* 112 */ int initflag;		/* this is special.  The kernel guarantees
     75				   to set it to 0 when a thread is launched,
     76				   so we can use it to detect whether this
     77				   instance of the emulator needs to be
     78				   initialised. */
     79} __attribute__ ((packed,aligned(4))) FPA11;
     80
     81extern int8 SetRoundingMode(const unsigned int);
     82extern int8 SetRoundingPrecision(const unsigned int);
     83extern void nwfpe_init_fpa(union fp_state *fp);
     84
     85extern unsigned int EmulateAll(unsigned int opcode);
     86
     87extern unsigned int EmulateCPDT(const unsigned int opcode);
     88extern unsigned int EmulateCPDO(const unsigned int opcode);
     89extern unsigned int EmulateCPRT(const unsigned int opcode);
     90
     91/* fpa11_cpdt.c */
     92extern unsigned int PerformLDF(const unsigned int opcode);
     93extern unsigned int PerformSTF(const unsigned int opcode);
     94extern unsigned int PerformLFM(const unsigned int opcode);
     95extern unsigned int PerformSFM(const unsigned int opcode);
     96
     97/* single_cpdo.c */
     98
     99extern unsigned int SingleCPDO(struct roundingData *roundData,
    100			       const unsigned int opcode, FPREG * rFd);
    101/* double_cpdo.c */
    102extern unsigned int DoubleCPDO(struct roundingData *roundData,
    103			       const unsigned int opcode, FPREG * rFd);
    104
    105/* extneded_cpdo.c */
    106extern unsigned int ExtendedCPDO(struct roundingData *roundData,
    107				 const unsigned int opcode, FPREG * rFd);
    108
    109#endif