/*   SCCS Id: @(#)portio.h   3.3     95/08/05                       */
/*   Copyright (c) NetHack PC Development Team 1995                 */
/*   NetHack may be freely redistributed.  See license for details. */
/*                                                                  */
/*
 * portio.h - PC port I/O Hardware support definitions and other
 *            low-level definitions.
 *                                                  
 */

#ifndef PORTIO_H
#define PORTIO_H

# if defined(__GO32__) || defined(__DJGPP__)
#define __far
#include <go32.h>
#include <dpmi.h>
#include <sys/farptr.h>
#endif

# if defined(_MSC_VER)
#define outportb _outp
#define outportw _outpw
#define inportb _inp
# endif
# if defined(__BORLANDC__)
#define outportw outport
/* #define inportb inport */
# endif

# ifndef MK_PTR
/*
 * Depending on environment, this is a macro to construct either:
 *
 *     -  a djgpp long 32 bit pointer from segment & offset values
 *     -  a far pointer from segment and offset values
 *
 */
#  if defined(_MSC_VER) || defined(__BORLANDC__)
#define MK_PTR(seg, offset) (void __far *)(((unsigned long)seg << 16) \
     + (unsigned long)(unsigned)offset)
#define READ_ABSOLUTE(x) *(x)
#define READ_ABSOLUTE_WORD(x) *(x)
#define WRITE_ABSOLUTE(x,y) *(x) = (y)
#define WRITE_ABSOLUTE_WORD(x,y) *(x) = (y)
#  endif

#  if defined(__GO32__) || defined(__DJGPP__)
#define MK_PTR(seg, offset) (void *)(((unsigned)seg << 4) + (unsigned)offset)
#define READ_ABSOLUTE(x) \
	(_farpeekb(_go32_conventional_mem_selector(), (unsigned)x))
#define READ_ABSOLUTE_WORD(x) \
	(_farpeekw(_go32_conventional_mem_selector(), (unsigned)x))
#define WRITE_ABSOLUTE(x,y) \
	_farpokeb(_go32_conventional_mem_selector(), (unsigned)x, (y))
#define WRITE_ABSOLUTE_WORD(x,y) \
	_farpokew(_go32_conventional_mem_selector(), (unsigned)x, (y))
#  endif

#  ifdef OBSOLETE   /* old djgpp V1.x way of mapping 1st MB */
#define MK_PTR(seg, offset) (void *)(0xE0000000+((((unsigned)seg << 4) \
     + (unsigned)offset)))
#define READ_ABSOLUTE(x) *(x)
#define READ_ABSOLUTE_WORD(x) *(x)
#define WRITE_ABSOLUTE(x,y) *(x) = (y)
#define WRITE_ABSOLUTE_WORD(x,y) *(x) = (y)
#  endif
# endif /* MK_PTR */

#endif /* PORTIO_H  */
/* portio.h */
