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https://github.com/Atmosphere-NX/Atmosphere.git
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35 lines
1.4 KiB
C++
35 lines
1.4 KiB
C++
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/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mesosphere.hpp>
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namespace ams::kern {
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namespace {
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constexpr size_t g_memory_block_page_shifts[] = { 0xC, 0x10, 0x15, 0x16, 0x19, 0x1D, 0x1E };
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constexpr size_t NumMemoryBlockPageShifts = util::size(g_memory_block_page_shifts);
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}
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size_t KMemoryManager::Impl::CalculateMetadataOverheadSize(size_t region_size) {
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const size_t ref_count_size = (region_size / PageSize) * sizeof(u16);
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const size_t bitmap_size = (util::AlignUp((region_size / PageSize), BITSIZEOF(u64)) / BITSIZEOF(u64)) * sizeof(u64);
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const size_t page_heap_size = KPageHeap::CalculateMetadataOverheadSize(region_size, g_memory_block_page_shifts, NumMemoryBlockPageShifts);
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return util::AlignUp(page_heap_size + bitmap_size + ref_count_size, PageSize);
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}
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}
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