arch/all-pc/boot/grub2-aros/grub-core/mmap/i386/mmap.c

   1 /* Mmap management. */
   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/machine/memory.h>
  21 #include <grub/i386/memory.h>
  22 #include <grub/memory.h>
  23 #include <grub/err.h>
  24 #include <grub/misc.h>
  25 #include <grub/mm.h>
  26
  27
  28 #ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
  29
  30 void *
  31 grub_mmap_malign_and_register (grub_uint64_t align, grub_uint64_t size,
  32                                int *handle, int type, int flags)
  33 {
  34   grub_uint64_t highestlow = 0;
  35
  36   auto int NESTED_FUNC_ATTR find_hook (grub_uint64_t, grub_uint64_t,
  37                                        grub_memory_type_t);
  38   int NESTED_FUNC_ATTR find_hook (grub_uint64_t start, grub_uint64_t rangesize,
  39                                   grub_memory_type_t memtype)
  40   {
  41     grub_uint64_t end = start + rangesize;
  42     if (memtype != GRUB_MEMORY_AVAILABLE)
  43       return 0;
  44     if (end > 0x100000)
  45       end = 0x100000;
  46     if (end > start + size
  47         && highestlow < ((end - size) - ((end - size) & (align - 1))))
  48       highestlow = (end - size)  - ((end - size) & (align - 1));
  49     return 0;
  50   }
  51
  52   void *ret;
  53   if (flags & GRUB_MMAP_MALLOC_LOW)
  54     {
  55       /* FIXME: use low-memory mm allocation once it's available. */
  56       grub_mmap_iterate (find_hook);
  57       ret = (void *) (grub_addr_t) highestlow;
  58     }
  59   else
  60     ret = grub_memalign (align, size);
  61
  62   if (! ret)
  63     {
  64       *handle = 0;
  65       return 0;
  66     }
  67
  68   *handle = grub_mmap_register ((grub_addr_t) ret, size, type);
  69   if (! *handle)
  70     {
  71       grub_free (ret);
  72       return 0;
  73     }
  74
  75   return ret;
  76 }
  77
  78 void
  79 grub_mmap_free_and_unregister (int handle)
  80 {
  81   struct grub_mmap_region *cur;
  82   grub_uint64_t addr;
  83
  84   for (cur = grub_mmap_overlays; cur; cur = cur->next)
  85     if (cur->handle == handle)
  86       break;
  87
  88   if (! cur)
  89     return;
  90
  91   addr = cur->start;
  92
  93   grub_mmap_unregister (handle);
  94
  95   if (addr >= 0x100000)
  96     grub_free ((void *) (grub_addr_t) addr);
  97 }
  98
  99 #endif