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/* 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/mm.h>
#include <grub/misc.h>
#include <grub/cpu/memory.h>
/* Helper for grub_mmap_get_lower. */
static int
lower_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
void *data)
{
grub_uint64_t *lower = data;
if (type != GRUB_MEMORY_AVAILABLE)
return 0;
if (addr == 0)
*lower = size;
return 0;
}
grub_uint64_t
grub_mmap_get_lower (void)
{
grub_uint64_t lower = 0;
grub_mmap_iterate (lower_hook, &lower);
if (lower > GRUB_ARCH_LOWMEMMAXSIZE)
lower = GRUB_ARCH_LOWMEMMAXSIZE;
return lower;
}
/* Helper for grub_mmap_get_upper. */
static int
upper_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
void *data)
{
grub_uint64_t *upper = data;
if (type != GRUB_MEMORY_AVAILABLE)
return 0;
if (addr <= GRUB_ARCH_HIGHMEMPSTART && addr + size
> GRUB_ARCH_HIGHMEMPSTART)
*upper = addr + size - GRUB_ARCH_HIGHMEMPSTART;
return 0;
}
grub_uint64_t
grub_mmap_get_upper (void)
{
grub_uint64_t upper = 0;
grub_mmap_iterate (upper_hook, &upper);
return upper;
}
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