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https://github.com/Atmosphere-NX/Atmosphere.git
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54 lines
2.5 KiB
C++
54 lines
2.5 KiB
C++
/*
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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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void KPageHeap::Initialize(KVirtualAddress address, size_t size, KVirtualAddress metadata_address, size_t metadata_size, const size_t *block_shifts, size_t num_block_shifts) {
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/* Check our assumptions. */
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MESOSPHERE_ASSERT(util::IsAligned(GetInteger(address), PageSize));
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MESOSPHERE_ASSERT(util::IsAligned(size, PageSize));
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MESOSPHERE_ASSERT(0 < num_block_shifts && num_block_shifts <= NumMemoryBlockPageShifts);
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const KVirtualAddress metadata_end = metadata_address + metadata_size;
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/* Set our members. */
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this->heap_address = address;
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this->heap_size = size;
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this->num_blocks = num_block_shifts;
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/* Setup bitmaps. */
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u64 *cur_bitmap_storage = GetPointer<u64>(metadata_address);
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for (size_t i = 0; i < num_block_shifts; i++) {
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const size_t cur_block_shift = block_shifts[i];
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const size_t next_block_shift = (i != num_block_shifts - 1) ? block_shifts[i + 1] : 0;
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cur_bitmap_storage = this->blocks[i].Initialize(this->heap_address, this->heap_size, cur_block_shift, next_block_shift, cur_bitmap_storage);
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}
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/* Ensure we didn't overextend our bounds. */
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MESOSPHERE_ABORT_UNLESS(KVirtualAddress(cur_bitmap_storage) <= metadata_end);
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}
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size_t KPageHeap::CalculateMetadataOverheadSize(size_t region_size, const size_t *block_shifts, size_t num_block_shifts) {
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size_t overhead_size = 0;
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for (size_t i = 0; i < num_block_shifts; i++) {
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const size_t cur_block_shift = block_shifts[i];
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const size_t next_block_shift = (i != num_block_shifts - 1) ? block_shifts[i + 1] : 0;
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overhead_size += KPageHeap::Block::CalculateMetadataOverheadSize(region_size, cur_block_shift, next_block_shift);
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}
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return util::AlignUp(overhead_size, PageSize);
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}
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}
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