/* Compute amount of lower and upper memory till the first hole. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/memory.h>
#include <grub/i386/memory.h>
#include <grub/mm.h>
#include <grub/misc.h>
grub_uint64_t
grub_mmap_get_lower (void)
{
grub_uint64_t lower = 0;
auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t,
grub_memory_type_t);
int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
grub_memory_type_t type)
{
if (type != GRUB_MEMORY_AVAILABLE)
return 0;
if (addr == 0)
lower = size;
return 0;
}
grub_mmap_iterate (hook);
if (lower > 0x100000)
lower = 0x100000;
return lower;
}
grub_uint64_t
grub_mmap_get_upper (void)
{
grub_uint64_t upper = 0;
auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t,
grub_memory_type_t);
int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
grub_memory_type_t type)
{
if (type != GRUB_MEMORY_AVAILABLE)
return 0;
if (addr <= 0x100000 && addr + size > 0x100000)
upper = addr + size - 0x100000;
return 0;
}
grub_mmap_iterate (hook);
return upper;
}
/* Count the continuous bytes after 64 MiB. */
grub_uint64_t
grub_mmap_get_post64 (void)
{
grub_uint64_t post64 = 0;
auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t,
grub_memory_type_t);
int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
grub_memory_type_t type)
{
if (type != GRUB_MEMORY_AVAILABLE)
return 0;
if (addr <= 0x4000000 && addr + size > 0x4000000)
post64 = addr + size - 0x4000000;
return 0;
}
grub_mmap_iterate (hook);
return post64;
}