auxiliary/os: add wrappers for mmap/munmap

The use of mmap() in winsys requires large file support.  Not all OSes
have LFS so a wrapper should be used.  In particular, os_mmap() should
call __mmap2() on Android.

src/gallium/auxiliary/os/os_mman.h

@@ -0,0 +1,87 @@
+/**************************************************************************
+ *
+ * Copyright 2011 LunarG, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * OS independent memory mapping (with large file support).
+ *
+ * @author Chia-I Wu <olvaffe@gmail.com>
+ */
+
+#ifndef _OS_MMAN_H_
+#define _OS_MMAN_H_
+
+
+#include "pipe/p_config.h"
+#include "pipe/p_compiler.h"
+
+#if defined(PIPE_OS_UNIX)
+#  ifndef _FILE_OFFSET_BITS
+#    error _FILE_OFFSET_BITS must be defined to 64
+#  endif
+#  include <sys/mman.h>
+#else
+#  error Unsupported OS
+#endif
+
+#if defined(PIPE_OS_ANDROID)
+#  include <errno.h> /* for EINVAL */
+#endif
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+
+#if defined(PIPE_OS_ANDROID)
+
+extern void *__mmap2(void *, size_t, int, int, int, size_t);
+
+static INLINE void *os_mmap(void *addr, size_t length, int prot, int flags, int fd, loff_t offset)
+{
+   /* offset must be aligned to 4096 (not necessarily the page size) */
+   if (unlikely(offset & 4095)) {
+      errno = EINVAL;
+      return MAP_FAILED;
+   }
+
+   return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
+}
+
+#else
+/* assume large file support exists */
+#  define os_mmap(addr, length, prot, flags, fd, offset) mmap(addr, length, prot, flags, fd, offset)
+#endif
+
+#define os_munmap(addr, length) munmap(addr, length)
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _OS_MMAN_H_ */