mmap/i386/uppermem.c

   1 /* Compute amount of lower and upper memory till the first hole. */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2009  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/memory.h>
  21 #include <grub/mm.h>
  22 #include <grub/misc.h>
  23
  24 grub_uint64_t
  25 grub_mmap_get_lower (void)
  26 {
  27   grub_uint64_t lower = 0;
  28
  29   auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
  30   int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
  31                              grub_uint32_t type)
  32     {
  33       if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
  34         return 0;
  35       if (addr == 0)
  36         lower = size;
  37       return 0;
  38     }
  39
  40   grub_mmap_iterate (hook);
  41   if (lower > 0x100000)
  42     lower =  0x100000;
  43   return lower;
  44 }
  45
  46 grub_uint64_t
  47 grub_mmap_get_upper (void)
  48 {
  49   grub_uint64_t upper = 0;
  50
  51   auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
  52   int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
  53                              grub_uint32_t type)
  54     {
  55       if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
  56         return 0;
  57       if (addr <= 0x100000 && addr + size > 0x100000)
  58         upper = addr + size - 0x100000;
  59       return 0;
  60     }
  61
  62   grub_mmap_iterate (hook);
  63   return upper;
  64 }
  65
  66 /* Count the continuous bytes after 64 MiB. */
  67 grub_uint64_t
  68 grub_mmap_get_post64 (void)
  69 {
  70   grub_uint64_t post64 = 0;
  71
  72   auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
  73   int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
  74                              grub_uint32_t type)
  75     {
  76       if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
  77         return 0;
  78       if (addr <= 0x4000000 && addr + size > 0x4000000)
  79         post64 = addr + size - 0x4000000;
  80       return 0;
  81     }
  82
  83   grub_mmap_iterate (hook);
  84   return post64;
  85 }