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[PATCH v2 02/45] Add a mmap flag (MAP_32BIT) on 64-bit platforms
- From: Sebastian Huber <sebastian dot huber at embedded-brains dot de>
- To: newlib at sourceware dot org
- Date: Fri, 10 Aug 2018 07:53:57 +0200
- Subject: [PATCH v2 02/45] Add a mmap flag (MAP_32BIT) on 64-bit platforms
- References: <20180810055440.22127-1-sebastian.huber@embedded-brains.de>
From: jhb <jhb@FreeBSD.org>
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)
---
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 536bfd562..6c757c8ba 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).
--
2.13.7