74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "common/page_table.h"
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namespace Common {
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PageTable::PageTable() = default;
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PageTable::~PageTable() noexcept = default;
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bool PageTable::BeginTraversal(TraversalEntry& out_entry, TraversalContext& out_context,
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u64 address) const {
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// Setup invalid defaults.
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out_entry.phys_addr = 0;
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out_entry.block_size = page_size;
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out_context.next_page = 0;
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// Validate that we can read the actual entry.
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const auto page = address / page_size;
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if (page >= backing_addr.size()) {
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return false;
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}
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// Validate that the entry is mapped.
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const auto phys_addr = backing_addr[page];
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if (phys_addr == 0) {
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return false;
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}
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// Populate the results.
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out_entry.phys_addr = phys_addr + address;
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out_context.next_page = page + 1;
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out_context.next_offset = address + page_size;
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return true;
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}
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bool PageTable::ContinueTraversal(TraversalEntry& out_entry, TraversalContext& context) const {
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// Setup invalid defaults.
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out_entry.phys_addr = 0;
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out_entry.block_size = page_size;
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// Validate that we can read the actual entry.
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const auto page = context.next_page;
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if (page >= backing_addr.size()) {
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return false;
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}
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// Validate that the entry is mapped.
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const auto phys_addr = backing_addr[page];
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if (phys_addr == 0) {
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return false;
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}
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// Populate the results.
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out_entry.phys_addr = phys_addr + context.next_offset;
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context.next_page = page + 1;
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context.next_offset += page_size;
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return true;
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}
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void PageTable::Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits) {
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const std::size_t num_page_table_entries{1ULL
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<< (address_space_width_in_bits - page_size_in_bits)};
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pointers.resize(num_page_table_entries);
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backing_addr.resize(num_page_table_entries);
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current_address_space_width_in_bits = address_space_width_in_bits;
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page_size = 1ULL << page_size_in_bits;
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}
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} // namespace Common
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