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/*  i386.h

 *

 *  This include file contains information pertaining to the Intel

 *  i386 processor.

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: i386.h,v 1.2 2001-09-27 11:59:27 chris Exp $

 */

#ifndef __i386_h

#define __i386_h

#ifdef __cplusplus

extern "C" {

#endif

/*

 *  This section contains the information required to build

 *  RTEMS for a particular member of the Intel i386

 *  family when executing in protected mode.  It does

 *  this by setting variables to indicate which implementation

 *  dependent features are present in a particular member

 *  of the family.

 *

 *  Currently recognized:

 *    i386_fp    (i386 DX or SX w/i387)

 *    i386_nofp  (i386 DX or SX w/o i387)

 *    i486dx

 *    i486sx

 *    pentium

 *    pentiumpro

 *

 *  CPU Model Feature Flags:

 *

 *  I386_HAS_BSWAP:  Defined to "1" if the instruction for endian swapping

 *                   (bswap) should be used.  This instruction appears to

 *                   be present in all i486's and above.

 *

 *  I386_HAS_FPU:    Defined to "1" if the CPU has an FPU.

 *

 */

#if defined(rtems_multilib)

/*

 *  Figure out all CPU Model Feature Flags based upon compiler

 *  predefines.

 */

#define CPU_MODEL_NAME  "rtems_multilib"

#define I386_HAS_FPU   0

#define I386_HAS_BSWAP 0

#elif defined(i386_fp)

#define CPU_MODEL_NAME  "i386 with i387"

#define I386_HAS_BSWAP 0

#elif defined(i386_nofp)

#define CPU_MODEL_NAME  "i386 w/o i387"

#define I386_HAS_FPU   0

#define I386_HAS_BSWAP 0

#elif defined(i486dx)

#define CPU_MODEL_NAME  "i486dx"

#elif defined(i486sx)

#define CPU_MODEL_NAME  "i486sx"

#define I386_HAS_FPU 0

#elif defined(pentium)

#define CPU_MODEL_NAME  "Pentium"

#elif defined(pentiumpro)

#define CPU_MODEL_NAME  "Pentium Pro"

#else

#error "Unsupported CPU Model"

#endif

/*

 *  Set default values for CPU model feature flags

 *

 *  NOTE: These settings are chosen to reflect most of the family members.

 */

#ifndef I386_HAS_FPU

#define I386_HAS_FPU 1

#endif

#ifndef I386_HAS_BSWAP

#define I386_HAS_BSWAP 1

#endif

/*

 *  Define the name of the CPU family.

 */

#define CPU_NAME "Intel i386"

#ifndef ASM

/*

 *  The following routine swaps the endian format of an unsigned int.

 *  It must be static so it can be referenced indirectly.

 */

static inline unsigned int i386_swap_U32(

  unsigned int value

)

{

  unsigned long lout;

#if (I386_HAS_BSWAP == 0)

  asm volatile( "rorw  $8,%%ax;"

                "rorl  $16,%0;"

                "rorw  $8,%%ax" : "=a" (lout) : "0" (value) );

#else

    __asm__ volatile( "bswap %0" : "=r"  (lout) : "0"   (value));

#endif

  return( lout );

}

static inline unsigned int i386_swap_U16(

  unsigned int value

)

{

    unsigned short      sout;

    __asm__ volatile( "rorw $8,%0" : "=r"  (sout) : "0"   (value));

    return (sout);

}

/* routines */

/*

 *  i386_Logical_to_physical

 *

 *  Converts logical address to physical address.

 */

void *i386_Logical_to_physical(

  unsigned short  segment,

  void           *address

);

/*

 *  i386_Physical_to_logical

 *

 *  Converts physical address to logical address.

 */

void *i386_Physical_to_logical(

  unsigned short  segment,

  void           *address

);

/*

 *  "Simpler" names for a lot of the things defined in this file

 */

/* segment access routines */

#define get_cs()   i386_get_cs()

#define get_ds()   i386_get_ds()

#define get_es()   i386_get_es()

#define get_ss()   i386_get_ss()

#define get_fs()   i386_get_fs()

#define get_gs()   i386_get_gs()

#define CPU_swap_u32( _value )  i386_swap_U32( _value )

#define CPU_swap_u16( _value )  i386_swap_U16( _value )

/* i80x86 I/O instructions */

#define outport_byte( _port, _value ) i386_outport_byte( _port, _value )

#define outport_word( _port, _value ) i386_outport_word( _port, _value )

#define outport_long( _port, _value ) i386_outport_long( _port, _value )

#define inport_byte( _port, _value )  i386_inport_byte( _port, _value )

#define inport_word( _port, _value )  i386_inport_word( _port, _value )

#define inport_long( _port, _value )  i386_inport_long( _port, _value )

#ifdef __cplusplus

}

#endif

#endif /* !ASM */

#endif

/* end of include file */