67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
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/* 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/mm.h>
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#include <grub/misc.h>
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#include <grub/machine/memory.h>
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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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auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
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int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
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grub_uint32_t type)
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{
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if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
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return 0;
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if (addr == 0)
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lower = size;
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return 0;
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}
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grub_mmap_iterate (hook);
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if (lower > GRUB_ARCH_LOWMEMMAXSIZE)
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lower = GRUB_ARCH_LOWMEMMAXSIZE;
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return lower;
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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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auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
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int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
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grub_uint32_t type)
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{
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if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
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return 0;
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if (addr <= GRUB_ARCH_HIGHMEMPSTART && addr + size
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> GRUB_ARCH_HIGHMEMPSTART)
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upper = addr + size - GRUB_ARCH_HIGHMEMPSTART;
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return 0;
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}
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grub_mmap_iterate (hook);
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return upper;
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}
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