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 */
  14 extern const void __nosave_begin, __nosave_end;
  15
  16 /*
  17  *      pfn_is_nosave - check if given pfn is in the 'nosave' section
  18  */
  19
  20 int 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 }