kernel/power/tuxonice_pageflags.h

   1 /*
   2  * kernel/power/tuxonice_pageflags.h
   3  *
   4  * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
   5  *
   6  * This file is released under the GPLv2.
   7  *
   8  * TuxOnIce needs a few pageflags while working that aren't otherwise
   9  * used. To save the struct page pageflags, we dynamically allocate
  10  * a bitmap and use that. These are the only non order-0 allocations
  11  * we do.
  12  *
  13  * NOTE!!!
  14  * We assume that PAGE_SIZE - sizeof(void *) is a multiple of
  15  * sizeof(unsigned long). Is this ever false?
  16  */
  17
  18 #include <linux/dyn_pageflags.h>
  19 #include <linux/suspend.h>
  20
  21 extern dyn_pageflags_t pageset1_map;
  22 extern dyn_pageflags_t pageset1_copy_map;
  23 extern dyn_pageflags_t pageset2_map;
  24 extern dyn_pageflags_t page_resave_map;
  25 extern dyn_pageflags_t io_map;
  26 extern dyn_pageflags_t nosave_map;
  27 extern dyn_pageflags_t free_map;
  28
  29 #define PagePageset1(page) (test_dynpageflag(&pageset1_map, page))
  30 #define SetPagePageset1(page) (set_dynpageflag(&pageset1_map, page))
  31 #define ClearPagePageset1(page) (clear_dynpageflag(&pageset1_map, page))
  32
  33 #define PagePageset1Copy(page) (test_dynpageflag(&pageset1_copy_map, page))
  34 #define SetPagePageset1Copy(page) (set_dynpageflag(&pageset1_copy_map, page))
  35 #define ClearPagePageset1Copy(page) (clear_dynpageflag(&pageset1_copy_map, page))
  36
  37 #define PagePageset2(page) (test_dynpageflag(&pageset2_map, page))
  38 #define SetPagePageset2(page) (set_dynpageflag(&pageset2_map, page))
  39 #define ClearPagePageset2(page) (clear_dynpageflag(&pageset2_map, page))
  40
  41 #define PageWasRW(page) (test_dynpageflag(&pageset2_map, page))
  42 #define SetPageWasRW(page) (set_dynpageflag(&pageset2_map, page))
  43 #define ClearPageWasRW(page) (clear_dynpageflag(&pageset2_map, page))
  44
  45 #define PageResave(page) (page_resave_map ? test_dynpageflag(&page_resave_map, page) : 0)
  46 #define SetPageResave(page) (set_dynpageflag(&page_resave_map, page))
  47 #define ClearPageResave(page) (clear_dynpageflag(&page_resave_map, page))
  48
  49 #define PageNosave(page) (nosave_map ? test_dynpageflag(&nosave_map, page) : 0)
  50 #define SetPageNosave(page) (set_dynpageflag(&nosave_map, page))
  51 #define ClearPageNosave(page) (clear_dynpageflag(&nosave_map, page))
  52
  53 #define PageNosaveFree(page) (free_map ? test_dynpageflag(&free_map, page) : 0)
  54 #define SetPageNosaveFree(page) (set_dynpageflag(&free_map, page))
  55 #define ClearPageNosaveFree(page) (clear_dynpageflag(&free_map, page))
  56
  57 extern void save_dyn_pageflags(dyn_pageflags_t pagemap);
  58 extern int load_dyn_pageflags(dyn_pageflags_t pagemap);
  59 extern int toi_pageflags_space_needed(void);