Xref: news2.mv.net comp.os.msdos.djgpp:3961
From: rick AT efn DOT org (Rick Bronson)
Newsgroups: comp.os.msdos.djgpp
Subject: Why does __dpmi_map_device_in_memory_block() always return 0x8025?
Date: 15 May 1996 21:26:43 GMT
Organization: Invivo Research Inc.
Lines: 42
Distribution: world
Message-ID: <RICK.96May15142643@dynip83.efn.org>
NNTP-Posting-Host: dynip83.efn.org
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

Hi,

  Could someone please help me out here?  I always seem to get
"invalid linear address" (0x8025) returned on the call to
__dpmi_map_device_in_memory_block().  Here's the code:


#define PAGE_SIZE 4096

  unsigned long addr_pg_align, rem_pg_align, size_pg_align;

  size_pg_align = 0x1000;
  meminfo.size = size_pg_align;
  meminfo.address = 0;  /* any address is acceptable */
  ret_val = __dpmi_allocate_memory(&meminfo);  /* COMMIT is 1 for DPMI 1.0 AX=0501 */
  meminfo.size = size_pg_align / PAGE_SIZE;  /* I've tried it without " / PAGE_SIZE" in */
  ret_val = __dpmi_map_device_in_memory_block (&meminfo, addr_pg_align); /* 508 */

  Here I always get -1 returned and __dpmi_error set to 0x8025.

  Any help greatly appreciated.

  If anone can point me to any examples using any of the following,
that would be greatly appreciated too.

__dpmi_physical_address_mapping();
__dpmi_allocate_memory();
__dpmi_map_device_in_memory_block();
__djgpp_map_physical_memory();


  Rick

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