mirror of https://github.com/yuzu-emu/yuzu.git
95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
#pragma once
|
|
|
|
#include <array>
|
|
#include <vector>
|
|
|
|
#include "core/hle/kernel/k_dynamic_slab_heap.h"
|
|
#include "core/hle/kernel/k_typed_address.h"
|
|
#include "core/hle/kernel/slab_helpers.h"
|
|
|
|
namespace Kernel {
|
|
|
|
namespace impl {
|
|
|
|
class PageTablePage {
|
|
public:
|
|
// Do not initialize anything.
|
|
PageTablePage() = default;
|
|
|
|
private:
|
|
// Initializer intentionally skipped
|
|
std::array<u8, PageSize> m_buffer;
|
|
};
|
|
static_assert(sizeof(PageTablePage) == PageSize);
|
|
|
|
} // namespace impl
|
|
|
|
class KPageTableSlabHeap : public KDynamicSlabHeap<impl::PageTablePage, true> {
|
|
public:
|
|
using RefCount = u16;
|
|
static constexpr size_t PageTableSize = sizeof(impl::PageTablePage);
|
|
static_assert(PageTableSize == PageSize);
|
|
|
|
public:
|
|
KPageTableSlabHeap() = default;
|
|
|
|
static constexpr size_t CalculateReferenceCountSize(size_t size) {
|
|
return (size / PageSize) * sizeof(RefCount);
|
|
}
|
|
|
|
void Initialize(KDynamicPageManager* page_allocator, size_t object_count, RefCount* rc) {
|
|
BaseHeap::Initialize(page_allocator, object_count);
|
|
this->Initialize(rc);
|
|
}
|
|
|
|
RefCount GetRefCount(KVirtualAddress addr) {
|
|
ASSERT(this->IsInRange(addr));
|
|
return *this->GetRefCountPointer(addr);
|
|
}
|
|
|
|
void Open(KVirtualAddress addr, int count) {
|
|
ASSERT(this->IsInRange(addr));
|
|
|
|
*this->GetRefCountPointer(addr) += static_cast<RefCount>(count);
|
|
|
|
ASSERT(this->GetRefCount(addr) > 0);
|
|
}
|
|
|
|
bool Close(KVirtualAddress addr, int count) {
|
|
ASSERT(this->IsInRange(addr));
|
|
ASSERT(this->GetRefCount(addr) >= count);
|
|
|
|
*this->GetRefCountPointer(addr) -= static_cast<RefCount>(count);
|
|
return this->GetRefCount(addr) == 0;
|
|
}
|
|
|
|
bool IsInPageTableHeap(KVirtualAddress addr) const {
|
|
return this->IsInRange(addr);
|
|
}
|
|
|
|
private:
|
|
void Initialize([[maybe_unused]] RefCount* rc) {
|
|
// TODO(bunnei): Use rc once we support kernel virtual memory allocations.
|
|
const auto count = this->GetSize() / PageSize;
|
|
m_ref_counts.resize(count);
|
|
|
|
for (size_t i = 0; i < count; i++) {
|
|
m_ref_counts[i] = 0;
|
|
}
|
|
}
|
|
|
|
RefCount* GetRefCountPointer(KVirtualAddress addr) {
|
|
return m_ref_counts.data() + ((addr - this->GetAddress()) / PageSize);
|
|
}
|
|
|
|
private:
|
|
using BaseHeap = KDynamicSlabHeap<impl::PageTablePage, true>;
|
|
|
|
std::vector<RefCount> m_ref_counts;
|
|
};
|
|
|
|
} // namespace Kernel
|