[newlib-cygwin] Add a mmap flag (MAP_32BIT) on 64-bit platforms

[Sebastian Huber <sh at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=472476a5a71d2490d2428d7552d501089393e884

commit 472476a5a71d2490d2428d7552d501089393e884
Author: jhb <jhb@FreeBSD.org>
Date:   Mon Sep 9 18:11:59 2013 +0000

    Add a mmap flag (MAP_32BIT) on 64-bit platforms
    
    to request that a mapping use an address in the first 2GB of the
    process's address space. This flag should have the same semantics as the
    same flag on Linux.
    
    To facilitate this, add a new parameter to vm_map_find() that specifies an
    optional maximum virtual address.  While here, fix several callers of
    vm_map_find() to use a VMFS_* constant for the findspace argument instead of
    TRUE and FALSE.
    
    Reviewed by:	alc
    Approved by:	re (kib)

Diff:
---
 newlib/libc/sys/rtems/include/sys/mman.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/newlib/libc/sys/rtems/include/sys/mman.h b/newlib/libc/sys/rtems/include/sys/mman.h
index 536bfd5..6c757c8 100644
--- a/newlib/libc/sys/rtems/include/sys/mman.h
+++ b/newlib/libc/sys/rtems/include/sys/mman.h
@@ -91,6 +91,9 @@
  */
 #define	MAP_NOCORE	 0x00020000 /* dont include these pages in a coredump */
 #define	MAP_PREFAULT_READ 0x00040000 /* prefault mapping for reading */
+#ifdef __LP64__
+#define	MAP_32BIT	 0x00080000 /* map in the low 2GB of address space */
+#endif
 
 /*
  * Request specific alignment (n == log2 of the desired alignment).