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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <list>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/common_types.h"
#include "core/hle/kernel/memory_types.h"
#include "core/hle/result.h"
namespace Kernel {
class KBlockInfoManager;
class KernelCore;
class KPageGroup;
class KBlockInfo {
public:
constexpr explicit KBlockInfo() : m_next(nullptr) {}
constexpr void Initialize(KPhysicalAddress addr, size_t np) {
ASSERT(Common::IsAligned(GetInteger(addr), PageSize));
ASSERT(static_cast<u32>(np) == np);
m_page_index = static_cast<u32>(addr / PageSize);
m_num_pages = static_cast<u32>(np);
}
constexpr KPhysicalAddress GetAddress() const {
return m_page_index * PageSize;
}
constexpr size_t GetNumPages() const {
return m_num_pages;
}
constexpr size_t GetSize() const {
return this->GetNumPages() * PageSize;
}
constexpr KPhysicalAddress GetEndAddress() const {
return (m_page_index + m_num_pages) * PageSize;
}
constexpr KPhysicalAddress GetLastAddress() const {
return this->GetEndAddress() - 1;
}
constexpr KBlockInfo* GetNext() const {
return m_next;
}
constexpr bool IsEquivalentTo(const KBlockInfo& rhs) const {
return m_page_index == rhs.m_page_index && m_num_pages == rhs.m_num_pages;
}
constexpr bool operator==(const KBlockInfo& rhs) const {
return this->IsEquivalentTo(rhs);
}
constexpr bool operator!=(const KBlockInfo& rhs) const {
return !(*this == rhs);
}
constexpr bool IsStrictlyBefore(KPhysicalAddress addr) const {
const KPhysicalAddress end = this->GetEndAddress();
if (m_page_index != 0 && end == 0) {
return false;
}
return end < addr;
}
constexpr bool operator<(KPhysicalAddress addr) const {
return this->IsStrictlyBefore(addr);
}
constexpr bool TryConcatenate(KPhysicalAddress addr, size_t np) {
if (addr != 0 && addr == this->GetEndAddress()) {
m_num_pages += static_cast<u32>(np);
return true;
}
return false;
}
private:
constexpr void SetNext(KBlockInfo* next) {
m_next = next;
}
private:
friend class KPageGroup;
KBlockInfo* m_next{};
u32 m_page_index{};
u32 m_num_pages{};
};
static_assert(sizeof(KBlockInfo) <= 0x10);
class KPageGroup {
public:
class Iterator {
public:
using iterator_category = std::forward_iterator_tag;
using value_type = const KBlockInfo;
using difference_type = std::ptrdiff_t;
using pointer = value_type*;
using reference = value_type&;
constexpr explicit Iterator(pointer n) : m_node(n) {}
constexpr bool operator==(const Iterator& rhs) const {
return m_node == rhs.m_node;
}
constexpr bool operator!=(const Iterator& rhs) const {
return !(*this == rhs);
}
constexpr pointer operator->() const {
return m_node;
}
constexpr reference operator*() const {
return *m_node;
}
constexpr Iterator& operator++() {
m_node = m_node->GetNext();
return *this;
}
constexpr Iterator operator++(int) {
const Iterator it{*this};
++(*this);
return it;
}
private:
pointer m_node{};
};
explicit KPageGroup(KernelCore& kernel, KBlockInfoManager* m)
: m_kernel{kernel}, m_manager{m} {}
~KPageGroup() {
this->Finalize();
}
void CloseAndReset();
void Finalize();
Iterator begin() const {
return Iterator{m_first_block};
}
Iterator end() const {
return Iterator{nullptr};
}
bool empty() const {
return m_first_block == nullptr;
}
Result AddBlock(KPhysicalAddress addr, size_t num_pages);
void Open() const;
void OpenFirst() const;
void Close() const;
size_t GetNumPages() const;
bool IsEquivalentTo(const KPageGroup& rhs) const;
bool operator==(const KPageGroup& rhs) const {
return this->IsEquivalentTo(rhs);
}
bool operator!=(const KPageGroup& rhs) const {
return !(*this == rhs);
}
private:
KernelCore& m_kernel;
KBlockInfo* m_first_block{};
KBlockInfo* m_last_block{};
KBlockInfoManager* m_manager{};
};
class KScopedPageGroup {
public:
explicit KScopedPageGroup(const KPageGroup* gp, bool not_first = true) : m_pg(gp) {
if (m_pg) {
if (not_first) {
m_pg->Open();
} else {
m_pg->OpenFirst();
}
}
}
explicit KScopedPageGroup(const KPageGroup& gp, bool not_first = true)
: KScopedPageGroup(std::addressof(gp), not_first) {}
~KScopedPageGroup() {
if (m_pg) {
m_pg->Close();
}
}
void CancelClose() {
m_pg = nullptr;
}
private:
const KPageGroup* m_pg{};
};
} // namespace Kernel
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