| /* 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; |
| } |