152 lines
4.5 KiB
C++
152 lines
4.5 KiB
C++
// SPDX-FileCopyrightText: 2021 Skyline Team and Contributors
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// SPDX-License-Identifier: GPL-3.0-or-later
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#pragma once
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#include <concepts>
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#include <functional>
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#include <mutex>
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#include <vector>
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#include "common/common_types.h"
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namespace Common {
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template <typename VaType, size_t AddressSpaceBits>
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concept AddressSpaceValid = std::is_unsigned_v<VaType> && sizeof(VaType) * 8 >=
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AddressSpaceBits;
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struct EmptyStruct {};
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/**
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* @brief FlatAddressSpaceMap provides a generic VA->PA mapping implementation using a sorted vector
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*/
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template <typename VaType, VaType UnmappedVa, typename PaType, PaType UnmappedPa,
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bool PaContigSplit, size_t AddressSpaceBits, typename ExtraBlockInfo = EmptyStruct>
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requires AddressSpaceValid<VaType, AddressSpaceBits>
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class FlatAddressSpaceMap {
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public:
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/// The maximum VA that this AS can technically reach
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static constexpr VaType VaMaximum{(1ULL << (AddressSpaceBits - 1)) +
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((1ULL << (AddressSpaceBits - 1)) - 1)};
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explicit FlatAddressSpaceMap(VaType va_limit,
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std::function<void(VaType, VaType)> unmap_callback = {});
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FlatAddressSpaceMap() = default;
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void Map(VaType virt, PaType phys, VaType size, ExtraBlockInfo extra_info = {}) {
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std::scoped_lock lock(block_mutex);
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MapLocked(virt, phys, size, extra_info);
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}
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void Unmap(VaType virt, VaType size) {
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std::scoped_lock lock(block_mutex);
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UnmapLocked(virt, size);
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}
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VaType GetVALimit() const {
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return va_limit;
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}
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protected:
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/**
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* @brief Represents a block of memory in the AS, the physical mapping is contiguous until
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* another block with a different phys address is hit
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*/
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struct Block {
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/// VA of the block
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VaType virt{UnmappedVa};
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/// PA of the block, will increase 1-1 with VA until a new block is encountered
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PaType phys{UnmappedPa};
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[[no_unique_address]] ExtraBlockInfo extra_info;
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Block() = default;
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Block(VaType virt_, PaType phys_, ExtraBlockInfo extra_info_)
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: virt(virt_), phys(phys_), extra_info(extra_info_) {}
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bool Valid() const {
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return virt != UnmappedVa;
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}
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bool Mapped() const {
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return phys != UnmappedPa;
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}
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bool Unmapped() const {
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return phys == UnmappedPa;
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}
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bool operator<(const VaType& p_virt) const {
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return virt < p_virt;
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}
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};
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/**
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* @brief Maps a PA range into the given AS region
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* @note block_mutex MUST be locked when calling this
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*/
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void MapLocked(VaType virt, PaType phys, VaType size, ExtraBlockInfo extra_info);
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/**
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* @brief Unmaps the given range and merges it with other unmapped regions
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* @note block_mutex MUST be locked when calling this
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*/
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void UnmapLocked(VaType virt, VaType size);
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std::mutex block_mutex;
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std::vector<Block> blocks{Block{}};
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/// a soft limit on the maximum VA of the AS
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VaType va_limit{VaMaximum};
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private:
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/// Callback called when the mappings in an region have changed
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std::function<void(VaType, VaType)> unmap_callback{};
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};
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/**
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* @brief FlatMemoryManager specialises FlatAddressSpaceMap to work as an allocator, with an
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* initial, fast linear pass and a subsequent slower pass that iterates until it finds a free block
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*/
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template <typename VaType, VaType UnmappedVa, size_t AddressSpaceBits>
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requires AddressSpaceValid<VaType, AddressSpaceBits>
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class FlatAllocator
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: public FlatAddressSpaceMap<VaType, UnmappedVa, bool, false, false, AddressSpaceBits> {
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private:
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using Base = FlatAddressSpaceMap<VaType, UnmappedVa, bool, false, false, AddressSpaceBits>;
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public:
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explicit FlatAllocator(VaType virt_start, VaType va_limit = Base::VaMaximum);
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/**
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* @brief Allocates a region in the AS of the given size and returns its address
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*/
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VaType Allocate(VaType size);
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/**
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* @brief Marks the given region in the AS as allocated
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*/
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void AllocateFixed(VaType virt, VaType size);
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/**
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* @brief Frees an AS region so it can be used again
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*/
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void Free(VaType virt, VaType size);
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VaType GetVAStart() const {
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return virt_start;
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}
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private:
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/// The base VA of the allocator, no allocations will be below this
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VaType virt_start;
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/**
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* The end address for the initial linear allocation pass
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* Once this reaches the AS limit the slower allocation path will be used
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*/
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VaType current_linear_alloc_end;
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};
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} // namespace Common
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