libc/sysdeps/linux/nds32/bits/uClibc_page.h

   1 /*
   2  * Copyright (C) 2016 Andes Technology, Inc.
   3  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   4  */
   5
   6 #ifndef _UCLIBC_PAGE_H
   7 #define _UCLIBC_PAGE_H
   8
   9 /*
  10  * Linux/NDS32 supports 4k and 8k pages (build time).
  11  *
  12  * Although uClibc determines page size dynamically from kernel's auxv
  13  * still the generic code needs a fall back
  14  *  _dl_pagesize = auxvt[AT_PAGESZ].a_un.a_val ? : PAGE_SIZE
  15  */
  16
  17 #include <features.h>
  18
  19 #if defined(__CONFIG_NDS32_PAGE_SIZE_8K__)
  20 #define PAGE_SHIFT              13
  21 #else
  22 #define PAGE_SHIFT              12
  23 #endif
  24
  25 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  26 #define PAGE_MASK       (~(PAGE_SIZE-1))
  27
  28 /* TBD: fix this with runtime value for a PAGE_SIZE agnostic uClibc */
  29 #define MMAP2_PAGE_SHIFT PAGE_SHIFT
  30
  31 #endif /* _UCLIBC_PAGE_H */