mirror of
https://git.eden-emu.dev/eden-emu/eden
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73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
// SPDX-FileCopyrightText: 2021 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/mman.h>
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#endif
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#include "common/assert.h"
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#include "common/multi_level_page_table.h"
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namespace Common {
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template <typename BaseAddr>
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MultiLevelPageTable<BaseAddr>::MultiLevelPageTable(std::size_t address_space_bits_, std::size_t first_level_bits_, std::size_t page_bits_)
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: address_space_bits{address_space_bits_}
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, first_level_bits{first_level_bits_}
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, page_bits{page_bits_}
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{
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if (page_bits == 0) {
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return;
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}
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first_level_shift = address_space_bits - first_level_bits;
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first_level_chunk_size = (1ULL << (first_level_shift - page_bits)) * sizeof(BaseAddr);
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alloc_size = (1ULL << (address_space_bits - page_bits)) * sizeof(BaseAddr);
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std::size_t first_level_size = 1ULL << first_level_bits;
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first_level_map.resize(first_level_size, nullptr);
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#ifdef _WIN32
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void* base{VirtualAlloc(nullptr, alloc_size, MEM_RESERVE, PAGE_READWRITE)};
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#else
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void* base{mmap(nullptr, alloc_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)};
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if (base == MAP_FAILED)
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base = nullptr;
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#endif
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ASSERT(base);
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base_ptr = reinterpret_cast<BaseAddr*>(base);
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}
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template <typename BaseAddr>
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MultiLevelPageTable<BaseAddr>::~MultiLevelPageTable() noexcept {
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if (!base_ptr) {
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return;
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}
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#ifdef _WIN32
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ASSERT(VirtualFree(base_ptr, 0, MEM_RELEASE));
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#else
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ASSERT(munmap(base_ptr, alloc_size) == 0);
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#endif
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}
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template <typename BaseAddr>
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void MultiLevelPageTable<BaseAddr>::ReserveRange(u64 start, std::size_t size) {
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const u64 new_start = start >> first_level_shift;
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const u64 new_end = (start + size) >> first_level_shift;
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for (u64 i = new_start; i <= new_end; i++)
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if (!first_level_map[i])
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AllocateLevel(i);
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}
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template <typename BaseAddr>
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void MultiLevelPageTable<BaseAddr>::AllocateLevel(u64 index) {
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void* ptr = reinterpret_cast<char *>(base_ptr) + index * first_level_chunk_size;
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#ifdef _WIN32
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void* base = VirtualAlloc(ptr, first_level_chunk_size, MEM_COMMIT, PAGE_READWRITE);
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ASSERT(base);
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#else
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void* base = ptr;
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#endif
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first_level_map[index] = base;
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}
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} // namespace Common
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