yuzu/src/common/page_table.cpp
Morph 99ceb03a1c general: Convert source file copyright comments over to SPDX
This formats all copyright comments according to SPDX formatting guidelines.
Additionally, this resolves the remaining GPLv2 only licensed files by relicensing them to GPLv2.0-or-later.
2022-04-23 05:55:32 -04:00

73 lines
2.1 KiB
C++

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