/*---------------------------------------------------------------------------+
 |  fpu_system.h                                                             |
 |  $Id: fpu_system.h,v 1.8 2003-04-16 18:38:52 sshwarts Exp $
 |                                                                           |
 | Copyright (C) 1992,1994,1997                                              |
 |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
 |                       Australia.  E-mail   billm@suburbia.net             |
 |                                                                           |
 +---------------------------------------------------------------------------*/

#ifndef _FPU_SYSTEM_H
#define _FPU_SYSTEM_H

/* Get data sizes from config.h generated from simulator's
 * configure script
 */
#include "config.h"
typedef Bit8u  u8; /* for FPU only */
typedef Bit8s  s8;
typedef Bit16u u16;
typedef Bit16s s16;
typedef Bit32u u32;
typedef Bit32s s32;
typedef Bit64u u64;
typedef Bit64s s64;

/* -----------------------------------------------------------
 * Slimmed down version used to compile against a CPU simulator
 * rather than a kernel (ported by Kevin Lawton)
 * ------------------------------------------------------------ */

#include <cpu/i387.h>

/* bbd: include ported linux headers after config.h for GCC_ATTRIBUTE macro */
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/types.h>

#ifndef WORDS_BIGENDIAN
#error "WORDS_BIGENDIAN not defined in config.h"
#elif WORDS_BIGENDIAN == 1
#define EMU_BIG_ENDIAN 1
#else
/* Nothing needed.  Lack of defining EMU_BIG_ENDIAN means
 * small endian
 */
#endif


extern unsigned fpu_get_user(void *ptr, unsigned len) BX_CPP_AttrRegparmN(2);
extern void fpu_put_user(unsigned val, void *ptr, unsigned len) BX_CPP_AttrRegparmN(2);

extern void fpu_verify_area(unsigned what, void *ptr, unsigned n) BX_CPP_AttrRegparmN(3);
extern void math_emulate_init(void);
extern unsigned fpu_get_ds(void);
extern void fpu_set_ax(u16);

#ifndef __ASSEMBLY__

struct info {
#ifdef BX_NO_EMPTY_STRUCTS
  unsigned char donotindexme;
#endif
  };

#define FPU_info ((struct info *) NULL)

#endif

#define SIGSEGV  11

extern struct i387_t *current_i387;

#define i387     (*current_i387)

#define SET_AX(val16)           fpu_set_ax(val16);

#define no_ip_update            (*(u_char *)&(i387.no_update))
#define FPU_rm                  (*(u_char *)&(i387.rm))

#define partial_status          (i387.swd)
#define control_word            (i387.cwd)
#define fpu_tag_word            (i387.twd)
#define registers               (i387.st_space)
#define top                     (i387.tos)

#define instruction_address     (*(struct address *)&i387.fip)
#define operand_address         (*(struct address *)&i387.foo)

#define FPU_verify_area(x,y,z)	fpu_verify_area((x),(y),(z))
#define FPU_get_user(x,y)       ((x) = fpu_get_user((y), sizeof(*(y))))
#define FPU_put_user(val,ptr)   fpu_put_user((val),(ptr),sizeof(*(ptr)))

#define FPU_DS  (fpu_get_ds())

// bbd: Change a pointer to an int, with type conversions that make it legal.
// First make it a void pointer, then convert to an integer of the same
// size as the pointer.  Otherwise, on machines with 64-bit pointers, 
// compilers complain when you typecast a 64-bit pointer into a 32-bit integer.
#define PTR2INT(x) ((bx_ptr_equiv_t)(void *)(x))

// bbd: Change an int to a pointer, with type conversions that make it legal.
// Same strategy as PTR2INT: change to bx_ptr_equiv_t which is an integer
// type of the same size as FPU_REG*.  Then the conversion to pointer
// is legal.
#define REGNO2PTR(x)		((FPU_REG*)((bx_ptr_equiv_t)(x)))

#endif