arch/all-pc/boot/grub2-aros/grub-core/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/i386/memory.h>
  22 #include <grub/mm.h>
  23 #include <grub/misc.h>
  24
  25 /* Helper for grub_mmap_get_lower.  */
  26 static int
  27 lower_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
  28             void *data)
  29 {
  30   grub_uint64_t *lower = data;
  31
  32   if (type != GRUB_MEMORY_AVAILABLE)
  33     return 0;
  34 #ifdef GRUB_MACHINE_COREBOOT
  35   if (addr <= 0x1000)
  36 #else
  37   if (addr == 0)
  38 #endif
  39     *lower = size + addr;
  40   return 0;
  41 }
  42
  43 grub_uint64_t
  44 grub_mmap_get_lower (void)
  45 {
  46   grub_uint64_t lower = 0;
  47
  48   grub_mmap_iterate (lower_hook, &lower);
  49   if (lower > 0x100000)
  50     lower =  0x100000;
  51   return lower;
  52 }
  53
  54 /* Helper for grub_mmap_get_upper.  */
  55 static int
  56 upper_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
  57             void *data)
  58 {
  59   grub_uint64_t *upper = data;
  60
  61   if (type != GRUB_MEMORY_AVAILABLE)
  62     return 0;
  63   if (addr <= 0x100000 && addr + size > 0x100000)
  64     *upper = addr + size - 0x100000;
  65   return 0;
  66 }
  67
  68 grub_uint64_t
  69 grub_mmap_get_upper (void)
  70 {
  71   grub_uint64_t upper = 0;
  72
  73   grub_mmap_iterate (upper_hook, &upper);
  74   return upper;
  75 }
  76
  77 /* Helper for grub_mmap_get_post64.  */
  78 static int
  79 post64_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
  80              void *data)
  81 {
  82   grub_uint64_t *post64 = data;
  83   if (type != GRUB_MEMORY_AVAILABLE)
  84     return 0;
  85   if (addr <= 0x4000000 && addr + size > 0x4000000)
  86     *post64 = addr + size - 0x4000000;
  87   return 0;
  88 }
  89
  90 /* Count the continuous bytes after 64 MiB. */
  91 grub_uint64_t
  92 grub_mmap_get_post64 (void)
  93 {
  94   grub_uint64_t post64 = 0;
  95
  96   grub_mmap_iterate (post64_hook, &post64);
  97   return post64;
  98 }