98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/* Mmap management. */
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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/machine/memory.h>
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#include <grub/memory.h>
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#include <grub/err.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
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void *
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grub_mmap_malign_and_register (grub_uint64_t align, grub_uint64_t size,
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int *handle, int type, int flags)
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{
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grub_uint64_t highestlow = 0;
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auto int NESTED_FUNC_ATTR find_hook (grub_uint64_t, grub_uint64_t,
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grub_uint32_t);
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int NESTED_FUNC_ATTR find_hook (grub_uint64_t start, grub_uint64_t rangesize,
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grub_uint32_t memtype)
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{
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grub_uint64_t end = start + rangesize;
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if (memtype != GRUB_MACHINE_MEMORY_AVAILABLE)
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return 0;
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if (end > 0x100000)
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end = 0x100000;
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if (end > start + size
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&& highestlow < ((end - size) - ((end - size) & (align - 1))))
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highestlow = (end - size) - ((end - size) & (align - 1));
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return 0;
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}
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void *ret;
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if (flags & GRUB_MMAP_MALLOC_LOW)
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{
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/* FIXME: use low-memory mm allocation once it's available. */
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grub_mmap_iterate (find_hook);
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ret = UINT_TO_PTR (highestlow);
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}
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else
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ret = grub_memalign (align, size);
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if (! ret)
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{
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*handle = 0;
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return 0;
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}
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*handle = grub_mmap_register (PTR_TO_UINT64 (ret), size, type);
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if (! *handle)
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{
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grub_free (ret);
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return 0;
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}
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return ret;
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}
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void
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grub_mmap_free_and_unregister (int handle)
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{
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struct grub_mmap_region *cur;
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grub_uint64_t addr;
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for (cur = grub_mmap_overlays; cur; cur = cur->next)
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if (cur->handle == handle)
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break;
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if (! cur)
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return;
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addr = cur->start;
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grub_mmap_unregister (handle);
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if (addr >= 0x100000)
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grub_free (UINT_TO_PTR (addr));
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}
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#endif
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