LXR linux/arch/powerpc/kernel/suspend.c

   1/*
   2 * Suspend support specific for power.
   3 *
   4 * Distribute under GPLv2
   5 *
   6 * Copyright (c) 2002 Pavel Machek <pavel@ucw.cz>
   7 * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
   8 */
   9
  10#include <linux/mm.h>
  11#include <asm/page.h>
  12
  13/* References to section boundaries */
  14extern const void __nosave_begin, __nosave_end;
  15
  16/*
  17 *      pfn_is_nosave - check if given pfn is in the 'nosave' section
  18 */
  19
  20int pfn_is_nosave(unsigned long pfn)
  21{
  22        unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
  23        unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
  24        return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
  25}
  26