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// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/page_table.h"
#include "common/scope_exit.h"
namespace Common {
PageTable::PageTable() = default;
PageTable::~PageTable() noexcept = default;
bool PageTable::BeginTraversal(TraversalEntry* out_entry, TraversalContext* out_context,
Common::ProcessAddress address) const {
out_context->next_offset = GetInteger(address);
out_context->next_page = address / page_size;
return this->ContinueTraversal(out_entry, out_context);
}
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.
if (auto const page = context->next_page; page < entries.size()) {
// Validate that the entry is mapped.
if (auto const paddr = entries[page].addr; paddr != 0) {
// Populate the results.
out_entry->phys_addr = paddr + context->next_offset;
context->next_page += 1;
context->next_offset += page_size;
return true;
}
}
context->next_page += 1;
context->next_offset += page_size;
return false;
}
void PageTable::Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits) {
auto const num_page_table_entries = 1ULL << (address_space_width_in_bits - page_size_in_bits);
entries.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
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