98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/* Compute amount of lower and upper memory till the first hole. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/memory.h>
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#include <grub/i386/memory.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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/* Helper for grub_mmap_get_lower. */
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static int
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lower_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
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void *data)
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{
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grub_uint64_t *lower = data;
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if (type != GRUB_MEMORY_AVAILABLE)
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return 0;
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#ifdef GRUB_MACHINE_COREBOOT
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if (addr <= 0x1000)
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#else
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if (addr == 0)
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#endif
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*lower = size + addr;
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return 0;
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}
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grub_uint64_t
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grub_mmap_get_lower (void)
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{
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grub_uint64_t lower = 0;
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grub_mmap_iterate (lower_hook, &lower);
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if (lower > 0x100000)
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lower = 0x100000;
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return lower;
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}
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/* Helper for grub_mmap_get_upper. */
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static int
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upper_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
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void *data)
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{
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grub_uint64_t *upper = data;
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if (type != GRUB_MEMORY_AVAILABLE)
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return 0;
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if (addr <= 0x100000 && addr + size > 0x100000)
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*upper = addr + size - 0x100000;
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return 0;
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}
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grub_uint64_t
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grub_mmap_get_upper (void)
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{
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grub_uint64_t upper = 0;
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grub_mmap_iterate (upper_hook, &upper);
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return upper;
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}
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/* Helper for grub_mmap_get_post64. */
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static int
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post64_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
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void *data)
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{
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grub_uint64_t *post64 = data;
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if (type != GRUB_MEMORY_AVAILABLE)
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return 0;
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if (addr <= 0x4000000 && addr + size > 0x4000000)
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*post64 = addr + size - 0x4000000;
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return 0;
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}
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/* Count the continuous bytes after 64 MiB. */
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grub_uint64_t
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grub_mmap_get_post64 (void)
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{
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grub_uint64_t post64 = 0;
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grub_mmap_iterate (post64_hook, &post64);
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return post64;
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}
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