86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
// Copyright 2021 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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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_,
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std::size_t first_level_bits_,
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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_}, page_bits{page_bits_} {
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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_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)};
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if (base == MAP_FAILED) {
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base = nullptr;
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}
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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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}
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}
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template <typename BaseAddr>
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void MultiLevelPageTable<BaseAddr>::AllocateLevel(u64 level) {
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void* ptr = reinterpret_cast<char *>(base_ptr) + level * 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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#else
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void* base{mmap(ptr, first_level_chunk_size, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)};
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if (base == MAP_FAILED) {
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base = nullptr;
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}
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#endif
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ASSERT(base);
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first_level_map[level] = base;
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}
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} // namespace Common
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