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Atmosphere/libraries/libmesosphere/include/mesosphere/kern_slab_helpers.hpp

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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <mesosphere/kern_common.hpp>
#include <mesosphere/kern_k_auto_object.hpp>
#include <mesosphere/kern_k_slab_heap.hpp>
#include <mesosphere/kern_k_auto_object_container.hpp>
#include <mesosphere/kern_k_unused_slab_memory.hpp>
namespace ams::kern {
template<class Derived, bool SupportDynamicExpansion = false>
class KSlabAllocated {
private:
static constinit inline KSlabHeap<Derived, SupportDynamicExpansion> s_slab_heap;
public:
constexpr KSlabAllocated() = default;
size_t GetSlabIndex() const {
return s_slab_heap.GetIndex(static_cast<const Derived *>(this));
}
public:
static void InitializeSlabHeap(void *memory, size_t memory_size) {
s_slab_heap.Initialize(memory, memory_size);
}
static Derived *Allocate() {
return s_slab_heap.Allocate();
}
static void Free(Derived *obj) {
s_slab_heap.Free(obj);
}
template<bool Enable = SupportDynamicExpansion, typename = typename std::enable_if<Enable>::type>
static Derived *AllocateFromUnusedSlabMemory() {
static_assert(Enable == SupportDynamicExpansion);
Derived * const obj = GetPointer<Derived>(AllocateUnusedSlabMemory(sizeof(Derived), alignof(Derived)));
if (AMS_LIKELY(obj != nullptr)) {
std::construct_at(obj);
}
return obj;
}
static size_t GetObjectSize() { return s_slab_heap.GetObjectSize(); }
static size_t GetSlabHeapSize() { return s_slab_heap.GetSlabHeapSize(); }
static size_t GetPeakIndex() { return s_slab_heap.GetPeakIndex(); }
static uintptr_t GetSlabHeapAddress() { return s_slab_heap.GetSlabHeapAddress(); }
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static size_t GetNumRemaining() { return s_slab_heap.GetNumRemaining(); }
};
template<typename Derived, typename Base, bool SupportDynamicExpansion> requires std::derived_from<Base, KAutoObject>
class KAutoObjectWithSlabHeapBase : public Base {
private:
template<typename, typename, bool> friend class KAutoObjectWithSlabHeap;
template<typename, typename, bool> friend class KAutoObjectWithSlabHeapAndContainer;
private:
static constinit inline KSlabHeap<Derived, SupportDynamicExpansion> s_slab_heap;
private:
static ALWAYS_INLINE Derived *Allocate() {
return s_slab_heap.Allocate();
}
static ALWAYS_INLINE void Free(Derived *obj) {
s_slab_heap.Free(obj);
}
private:
static ALWAYS_INLINE bool IsInitialized(const Derived *obj) {
if constexpr (requires { { obj->IsInitialized() } -> std::same_as<bool>; }) {
return obj->IsInitialized();
} else {
return true;
}
}
static ALWAYS_INLINE uintptr_t GetPostDestroyArgument(const Derived *obj) {
if constexpr (requires { { obj->GetPostDestroyArgument() } -> std::same_as<uintptr_t>; }) {
return obj->GetPostDestroyArgument();
} else {
return 0;
}
}
public:
constexpr explicit KAutoObjectWithSlabHeapBase(util::ConstantInitializeTag) : Base(util::ConstantInitialize) { /* ... */ }
explicit KAutoObjectWithSlabHeapBase() { /* ... */ }
/* NOTE: IsInitialized() and GetPostDestroyArgument() are virtual functions declared in this class, */
/* in Nintendo's kernel. We fully devirtualize them, as Destroy() is the only user of them. */
/* We also devirtualize KAutoObject::Finalize(), which is only used by this function in Nintendo's kernel. */
virtual void Destroy() override final {
Derived * const derived = static_cast<Derived *>(this);
if (KAutoObjectWithSlabHeapBase<Derived, Base, SupportDynamicExpansion>::IsInitialized(derived)) {
Derived::PreFinalize(derived);
const uintptr_t arg = KAutoObjectWithSlabHeapBase<Derived, Base, SupportDynamicExpansion>::GetPostDestroyArgument(derived);
derived->Finalize();
KAutoObjectWithSlabHeapBase<Derived, Base, SupportDynamicExpansion>::Free(derived);
Derived::PostDestroy(arg);
} else {
KAutoObjectWithSlabHeapBase<Derived, Base, SupportDynamicExpansion>::Free(derived);
}
}
size_t GetSlabIndex() const {
return s_slab_heap.GetObjectIndex(static_cast<const Derived *>(this));
}
public:
static void InitializeSlabHeap(void *memory, size_t memory_size) {
s_slab_heap.Initialize(memory, memory_size);
}
static Derived *Create() {
Derived *obj = Allocate();
if (AMS_LIKELY(obj != nullptr)) {
KAutoObject::Create<Derived>(obj);
}
return obj;
}
template<bool Enable = SupportDynamicExpansion, typename = typename std::enable_if<Enable>::type>
static Derived *CreateFromUnusedSlabMemory() {
static_assert(Enable == SupportDynamicExpansion);
Derived * const obj = GetPointer<Derived>(AllocateUnusedSlabMemory(sizeof(Derived), alignof(Derived)));
if (AMS_LIKELY(obj != nullptr)) {
std::construct_at(obj);
KAutoObject::Create<Derived>(obj);
}
return obj;
}
static size_t GetObjectSize() { return s_slab_heap.GetObjectSize(); }
static size_t GetSlabHeapSize() { return s_slab_heap.GetSlabHeapSize(); }
static size_t GetPeakIndex() { return s_slab_heap.GetPeakIndex(); }
static uintptr_t GetSlabHeapAddress() { return s_slab_heap.GetSlabHeapAddress(); }
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static size_t GetNumRemaining() { return s_slab_heap.GetNumRemaining(); }
};
template<typename Derived, typename Base, bool SupportDynamicExpansion = false>
class KAutoObjectWithSlabHeap : public KAutoObjectWithSlabHeapBase<Derived, Base, SupportDynamicExpansion> {
public:
constexpr explicit KAutoObjectWithSlabHeap(util::ConstantInitializeTag) : KAutoObjectWithSlabHeapBase<Derived, Base, SupportDynamicExpansion>(util::ConstantInitialize) { /* ... */ }
explicit KAutoObjectWithSlabHeap() { /* ... */ }
static ALWAYS_INLINE void PreFinalize(Derived *) { /* ... */ }
};
template<typename Derived, typename Base, bool SupportDynamicExpansion = false> requires std::derived_from<Base, KAutoObjectWithList>
class KAutoObjectWithSlabHeapAndContainer : public KAutoObjectWithSlabHeapBase<Derived, Base, SupportDynamicExpansion> {
private:
static constinit inline KAutoObjectWithListContainer<Derived> s_container;
public:
class ListAccessor : public KAutoObjectWithListContainer<Derived>::ListAccessor {
public:
ALWAYS_INLINE ListAccessor() : KAutoObjectWithListContainer<Derived>::ListAccessor(s_container) { /* ... */ }
ALWAYS_INLINE ~ListAccessor() { /* ... */ }
};
public:
constexpr explicit KAutoObjectWithSlabHeapAndContainer(util::ConstantInitializeTag) : KAutoObjectWithSlabHeapBase<Derived, Base, SupportDynamicExpansion>(util::ConstantInitialize) { /* ... */ }
explicit KAutoObjectWithSlabHeapAndContainer() { /* ... */ }
public:
static void InitializeSlabHeap(void *memory, size_t memory_size) {
KAutoObjectWithSlabHeapBase<Derived, Base, SupportDynamicExpansion>::InitializeSlabHeap(memory, memory_size);
s_container.Initialize();
}
static void Register(Derived *obj) {
return s_container.Register(obj);
}
static ALWAYS_INLINE void PreFinalize(Derived *obj) { s_container.Unregister(obj); }
};
}