/* i386.h
*
* This include file contains information pertaining to the Intel
* i386 processor.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* 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.
*
* $Id$
*/
#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
*
* 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(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"
#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 */
