mirror of
https://github.com/Atmosphere-NX/Atmosphere
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130 lines
6.5 KiB
C++
130 lines
6.5 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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#pragma once
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#include <mesosphere/kern_common.hpp>
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namespace ams::kern {
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class KPageHeap {
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private:
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static constexpr inline size_t MemoryBlockPageShifts[] = { 0xC, 0x10, 0x15, 0x16, 0x19, 0x1D, 0x1E };
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static constexpr size_t NumMemoryBlockPageShifts = util::size(MemoryBlockPageShifts);
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private:
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class Block {
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private:
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class Bitmap {
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public:
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static constexpr size_t MaxDepth = 4;
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private:
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u64 *bit_storages[MaxDepth];
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size_t num_bits;
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size_t depth;
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public:
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constexpr Bitmap() : bit_storages(), num_bits(), depth() { /* ... */ }
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u64 *Initialize(u64 *storage, size_t size) {
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/* Initially, everything is un-set. */
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this->num_bits = 0;
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/* Calculate the needed bitmap depth. */
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this->depth = static_cast<size_t>(GetRequiredDepth(size));
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MESOSPHERE_ASSERT(this->depth <= MaxDepth);
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/* Set the bitmap pointers. */
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for (s32 d = static_cast<s32>(this->depth) - 1; d >= 0; d--) {
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this->bit_storages[d] = storage;
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size = util::AlignUp(size, BITSIZEOF(u64)) / BITSIZEOF(u64);
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storage += size;
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}
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return storage;
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}
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private:
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static constexpr s32 GetRequiredDepth(size_t region_size) {
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s32 depth = 0;
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while (true) {
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region_size /= BITSIZEOF(u64);
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depth++;
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if (region_size == 0) {
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return depth;
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}
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}
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}
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public:
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static constexpr size_t CalculateMetadataOverheadSize(size_t region_size) {
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size_t overhead_bits = 0;
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for (s32 depth = GetRequiredDepth(region_size) - 1; depth >= 0; depth--) {
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region_size = util::AlignUp(region_size, BITSIZEOF(u64)) / BITSIZEOF(u64);
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overhead_bits += region_size;
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}
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return overhead_bits * sizeof(u64);
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}
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};
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private:
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Bitmap bitmap;
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KVirtualAddress heap_address;
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uintptr_t end_offset;
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size_t block_shift;
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size_t next_block_shift;
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public:
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constexpr Block() : bitmap(), heap_address(), end_offset(), block_shift(), next_block_shift() { /* ... */ }
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u64 *Initialize(KVirtualAddress addr, size_t size, size_t bs, size_t nbs, u64 *bit_storage) {
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/* Set shifts. */
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this->block_shift = bs;
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this->next_block_shift = nbs;
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/* Align up the address. */
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KVirtualAddress end = addr + size;
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const size_t align = (this->next_block_shift != 0) ? (1ul << this->next_block_shift) : (this->block_shift);
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addr = util::AlignDown(GetInteger(addr), align);
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end = util::AlignUp(GetInteger(end), align);
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this->heap_address = addr;
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this->end_offset = (end - addr) / (1ul << this->block_shift);
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return this->bitmap.Initialize(bit_storage, this->end_offset);
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}
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public:
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static constexpr size_t CalculateMetadataOverheadSize(size_t region_size, size_t cur_block_shift, size_t next_block_shift) {
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const size_t cur_block_size = (1ul << cur_block_shift);
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const size_t next_block_size = (1ul << next_block_shift);
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const size_t align = (next_block_shift != 0) ? next_block_size : cur_block_size;
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return Bitmap::CalculateMetadataOverheadSize((align * 2 + util::AlignUp(region_size, align)) / cur_block_size);
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}
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};
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private:
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KVirtualAddress heap_address;
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size_t heap_size;
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size_t used_size;
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size_t num_blocks;
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Block blocks[NumMemoryBlockPageShifts];
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private:
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void Initialize(KVirtualAddress heap_address, size_t heap_size, KVirtualAddress metadata_address, size_t metadata_size, const size_t *block_shifts, size_t num_block_shifts);
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public:
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constexpr KPageHeap() : heap_address(), heap_size(), used_size(), num_blocks(), blocks() { /* ... */ }
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void Initialize(KVirtualAddress heap_address, size_t heap_size, KVirtualAddress metadata_address, size_t metadata_size) {
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return Initialize(heap_address, heap_size, metadata_address, metadata_size, MemoryBlockPageShifts, NumMemoryBlockPageShifts);
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}
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private:
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static size_t CalculateMetadataOverheadSize(size_t region_size, const size_t *block_shifts, size_t num_block_shifts);
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public:
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static size_t CalculateMetadataOverheadSize(size_t region_size) {
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return CalculateMetadataOverheadSize(region_size, MemoryBlockPageShifts, NumMemoryBlockPageShifts);
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}
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};
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}
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