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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <list>
#include "common/assert.h"
#include "common/common_types.h"
#include "core/hle/kernel/memory_types.h"
#include "core/hle/result.h"
namespace Kernel {
class KPageGroup final {
public:
class Node final {
public:
constexpr Node(u64 addr_, std::size_t num_pages_) : addr{addr_}, num_pages{num_pages_} {}
constexpr u64 GetAddress() const {
return addr;
}
constexpr std::size_t GetNumPages() const {
return num_pages;
}
constexpr std::size_t GetSize() const {
return GetNumPages() * PageSize;
}
private:
u64 addr{};
std::size_t num_pages{};
};
public:
KPageGroup() = default;
KPageGroup(u64 address, u64 num_pages) {
ASSERT(AddBlock(address, num_pages).IsSuccess());
}
constexpr std::list<Node>& Nodes() {
return nodes;
}
constexpr const std::list<Node>& Nodes() const {
return nodes;
}
std::size_t GetNumPages() const {
std::size_t num_pages = 0;
for (const Node& node : nodes) {
num_pages += node.GetNumPages();
}
return num_pages;
}
bool IsEqual(KPageGroup& other) const {
auto this_node = nodes.begin();
auto other_node = other.nodes.begin();
while (this_node != nodes.end() && other_node != other.nodes.end()) {
if (this_node->GetAddress() != other_node->GetAddress() ||
this_node->GetNumPages() != other_node->GetNumPages()) {
return false;
}
this_node = std::next(this_node);
other_node = std::next(other_node);
}
return this_node == nodes.end() && other_node == other.nodes.end();
}
Result AddBlock(u64 address, u64 num_pages) {
if (!num_pages) {
return ResultSuccess;
}
if (!nodes.empty()) {
const auto node = nodes.back();
if (node.GetAddress() + node.GetNumPages() * PageSize == address) {
address = node.GetAddress();
num_pages += node.GetNumPages();
nodes.pop_back();
}
}
nodes.push_back({address, num_pages});
return ResultSuccess;
}
bool Empty() const {
return nodes.empty();
}
private:
std::list<Node> nodes;
};
} // namespace Kernel
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