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locsysio.h

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/*******************************************************************
 * Lots of files in emcmot need the functions inb/outb  
 * the normal way thes are defined is by including either asm/io.h or
 * sys/io.h.
 * However lots of things can go wrong in trying to include these
 * depending on compiler/kernel/libc version etc so instead of including
 * them directly include this LOCal SYS/IO.H file that tries to fix
 * some of these problems.
 *******************************************************************/

#ifndef LOCSYSIO_H
#define LOCSYSIO_H

/*
  Compiling this for LINUX (not RTLINUX) means linking this into a Linux
  process, running non-real-time in user space. This is useful for debugging.
  If this is done, then the following stuff needs to be done to access the
  IO space.
  */

#ifdef DEFINE_EXTERN_BEFORE_IO
/*
  Because of a limitation in gcc (present at least in 2.7.2.1 and below), you
  _have to_ compile any source code that uses these routines with optimisation
  turned on (gcc -O1 or higher), or alternatively #define extern to be
  empty before #including <asm/io.h>.

  Otherwise, you'll get errors at link time like:

  stg.c:475: undefined reference to `__inbc'
 */
#define extern
#endif

/*
  Need to access ports in range 0x200-0x21F and 0x600-0x61F, for default
  STG base address. ioperm() only enables up to 0x3FF, so we need to use
  iopl() to grant full access to IO space.
  */
#include <sys/types.h>
#include <unistd.h>             /* iopl() */


#if defined(__KERNEL__) && defined(linux)
#include <linux/kernel.h>
#if !defined(rtai)
/* P.C.  These two headers cause a bunch of compiler errors on
   a RH7.1 system using 2.4.9-rtai
   */
#include <linux/types.h>
#include <linux/fs.h>
#endif
#endif

#if defined(linux) || defined(rtlinux) || defined(rtai)
#include <sys/io.h>             /* ioperm() */
#endif


/* Linux or RT-Linux use io ports */
#ifndef LINUX_VERSION_CODE
#include <linux/version.h>
#endif

#ifndef __GLIBC__
#include <features.h>           /* __GLIBC__  */
#endif

// Pre 2.2 kernels don't seem to have the KERNEL_VERSION macro.
#ifndef KERNEL_VERSION
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#endif

/* Only include this for systems with an old version of glibc or an
 old version of the linux kernel.  Othewise it is not needed and results
 in a bunch of redefined symbol warnings/errors.
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,2,0) || !defined(__GLIBC__) || __GLIBC__ < 2
#include <asm/io.h>             /* outw, inw */
#endif

#endif
// LOCSYSIO_H

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