arch/all-pc/boot/grub2-aros/grub-core/mmap/mips/yeeloong/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 #include <grub/machine/memory.h>
  24
  25 grub_uint64_t
  26 grub_mmap_get_lower (void)
  27 {
  28   grub_uint64_t lower = 0;
  29
  30   auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t,
  31                                   grub_memory_type_t);
  32   int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
  33                              grub_memory_type_t type)
  34     {
  35       if (type != GRUB_MEMORY_AVAILABLE)
  36         return 0;
  37       if (addr == 0)
  38         lower = size;
  39       return 0;
  40     }
  41
  42   grub_mmap_iterate (hook);
  43   if (lower > GRUB_ARCH_LOWMEMMAXSIZE)
  44     lower = GRUB_ARCH_LOWMEMMAXSIZE;
  45   return lower;
  46 }
  47
  48 grub_uint64_t
  49 grub_mmap_get_upper (void)
  50 {
  51   grub_uint64_t upper = 0;
  52
  53   auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t,
  54                                   grub_memory_type_t);
  55   int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
  56                              grub_memory_type_t type)
  57     {
  58       if (type != GRUB_MEMORY_AVAILABLE)
  59         return 0;
  60       if (addr <= GRUB_ARCH_HIGHMEMPSTART && addr + size
  61           > GRUB_ARCH_HIGHMEMPSTART)
  62         upper = addr + size - GRUB_ARCH_HIGHMEMPSTART;
  63       return 0;
  64     }
  65
  66   grub_mmap_iterate (hook);
  67   return upper;
  68 }