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From: RayeR <glaux AT centrum DOT cz>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Bash bugs (was: djgpp/libreadline bug)
Date: Wed, 7 Apr 2010 17:11:16 -0700 (PDT)
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

> One (non-GNU) third-party app in particular won't port to DJGPP
> because it needs mmap(), which I think I was told is default in a
> newer POSIX version. Checking the newsgroup archives here shows that
> DPMI 1.0 could maybe support such emulation, but nobody has bothered
> (for the big obvious reason, it's not common)

When I ported nVClock to DOS I made this function to replace mmap
stuff
(it's needed to access MMIO registers of GPU placed in address space
beyond 1st meg)

//***************** call DPMI physical memory mapping and allocate LDT
descriptor for the memory block
void *map_physical_memory(uint32_t phys_base, uint32_t size) //
phys_base must be page aligned
{							     // size will be aligned automatically
  void *p;
  if (size == 0)		       // if zero block size, do nothing
    return(NULL);
  if ((size & 0x0FFF) != 0)	       // if size is not page-aligned
    size = (size + 4096) & (~0x0FFF);  // make it page-aligned
  if ((p = valloc(size)) == NULL)      // allocate page-aligned memory
(__djgpp_map_physical_memory required this)
    {				       // allocation failed
    printf("ERROR: cannot allocate %lu bytes for memory mapped device
\n",size);
    exit(-1);			       // exit program
    }
  if (__djgpp_map_physical_memory(p,size,phys_base))
    {				       // failed to map physmem
    printf("ERROR: failed to map physical memory range: 0x%08lX - 0x
%08lX\nDPMI 1.0 server or support of DPMI function 0508h is needed.
\nIt doesn't work under Windows, use win32 version instead.
\n",phys_base,phys_base+size-1);
    exit(-1);			       // exit program
    }
  return(p);			       // return pointer to memory block aliasing
physical memory area
}