mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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284 lines
11 KiB
C++
284 lines
11 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <mesosphere/kern_common.hpp>
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#include <mesosphere/kern_k_auto_object.hpp>
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#include <mesosphere/kern_k_spin_lock.hpp>
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#include <mesosphere/kern_k_thread.hpp>
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namespace ams::kern {
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constexpr ALWAYS_INLINE util::BitPack32 GetHandleBitPack(ams::svc::Handle handle) {
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return util::BitPack32{handle};
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}
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class KHandleTable {
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NON_COPYABLE(KHandleTable);
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NON_MOVEABLE(KHandleTable);
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public:
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static constexpr size_t MaxTableSize = 1024;
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private:
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using HandleRawValue = util::BitPack32::Field<0, BITSIZEOF(u32), u32>;
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using HandleEncoded = util::BitPack32::Field<0, BITSIZEOF(ams::svc::Handle), ams::svc::Handle>;
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using HandleIndex = util::BitPack32::Field<0, 15, u16>;
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using HandleLinearId = util::BitPack32::Field<HandleIndex::Next, 15, u16>;
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using HandleReserved = util::BitPack32::Field<HandleLinearId::Next, 2, u32>;
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static constexpr u16 MinLinearId = 1;
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static constexpr u16 MaxLinearId = util::BitPack32{std::numeric_limits<u32>::max()}.Get<HandleLinearId>();
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static constexpr ALWAYS_INLINE ams::svc::Handle EncodeHandle(u16 index, u16 linear_id) {
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util::BitPack32 pack = {0};
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pack.Set<HandleIndex>(index);
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pack.Set<HandleLinearId>(linear_id);
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pack.Set<HandleReserved>(0);
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return pack.Get<HandleEncoded>();
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}
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class Entry {
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private:
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union {
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struct {
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u16 linear_id;
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u16 type;
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} info;
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Entry *next_free_entry;
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} meta;
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KAutoObject *object;
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public:
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constexpr Entry() : meta(), object(nullptr) { /* ... */ }
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constexpr ALWAYS_INLINE void SetFree(Entry *next) {
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this->object = nullptr;
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this->meta.next_free_entry = next;
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}
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constexpr ALWAYS_INLINE void SetUsed(KAutoObject *obj, u16 linear_id, u16 type) {
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this->object = obj;
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this->meta.info = { linear_id, type };
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}
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constexpr ALWAYS_INLINE KAutoObject *GetObject() const { return this->object; }
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constexpr ALWAYS_INLINE Entry *GetNextFreeEntry() const { return this->meta.next_free_entry; }
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constexpr ALWAYS_INLINE u16 GetLinearId() const { return this->meta.info.linear_id; }
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constexpr ALWAYS_INLINE u16 GetType() const { return this->meta.info.type; }
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};
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private:
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mutable KSpinLock lock;
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Entry *table;
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Entry *free_head;
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Entry entries[MaxTableSize];
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u16 table_size;
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u16 max_count;
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u16 next_linear_id;
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u16 count;
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public:
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constexpr KHandleTable() :
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lock(), table(nullptr), free_head(nullptr), entries(), table_size(0), max_count(0), next_linear_id(MinLinearId), count(0)
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{ MESOSPHERE_ASSERT_THIS(); }
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constexpr NOINLINE Result Initialize(s32 size) {
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MESOSPHERE_ASSERT_THIS();
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R_UNLESS(size <= static_cast<s32>(MaxTableSize), svc::ResultOutOfMemory());
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/* Initialize all fields. */
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this->table = this->entries;
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this->table_size = (size <= 0) ? MaxTableSize : table_size;
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this->next_linear_id = MinLinearId;
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this->count = 0;
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this->max_count = 0;
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/* Free all entries. */
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for (size_t i = 0; i < static_cast<size_t>(this->table_size - 1); i++) {
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this->entries[i].SetFree(std::addressof(this->entries[i + 1]));
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}
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this->entries[this->table_size - 1].SetFree(nullptr);
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this->free_head = std::addressof(this->entries[0]);
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return ResultSuccess();
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}
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constexpr ALWAYS_INLINE size_t GetTableSize() const { return this->table_size; }
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constexpr ALWAYS_INLINE size_t GetCount() const { return this->count; }
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constexpr ALWAYS_INLINE size_t GetMaxCount() const { return this->max_count; }
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NOINLINE Result Finalize();
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NOINLINE bool Remove(ams::svc::Handle handle);
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template<typename T = KAutoObject>
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ALWAYS_INLINE KScopedAutoObject<T> GetObject(ams::svc::Handle handle) const {
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MESOSPHERE_ASSERT_THIS();
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KScopedDisableDispatch dd;
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KScopedSpinLock lk(this->lock);
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if constexpr (std::is_same<T, KAutoObject>::value) {
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return this->GetObjectImpl(handle);
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} else {
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return this->GetObjectImpl(handle)->DynamicCast<T*>();
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}
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}
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template<typename T = KAutoObject>
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ALWAYS_INLINE KScopedAutoObject<T> GetObjectForIpc(ams::svc::Handle handle) const {
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/* TODO: static_assert(!std::is_base_of<KInterruptEvent, T>::value); */
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KAutoObject *obj = this->GetObjectImpl(handle);
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if (false /* TODO: obj->DynamicCast<KInterruptEvent *>() != nullptr */) {
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return nullptr;
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}
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if constexpr (std::is_same<T, KAutoObject>::value) {
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return obj;
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} else {
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return obj->DynamicCast<T*>();
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}
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}
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ALWAYS_INLINE KScopedAutoObject<KAutoObject> GetObjectByIndex(ams::svc::Handle *out_handle, size_t index) const {
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MESOSPHERE_ASSERT_THIS();
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KScopedDisableDispatch dd;
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KScopedSpinLock lk(this->lock);
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return this->GetObjectByIndexImpl(out_handle, index);
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}
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NOINLINE Result Reserve(ams::svc::Handle *out_handle);
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NOINLINE void Unreserve(ams::svc::Handle handle);
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template<typename T>
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ALWAYS_INLINE Result Add(ams::svc::Handle *out_handle, T *obj) {
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static_assert(std::is_base_of<KAutoObject, T>::value);
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return this->Add(out_handle, obj, obj->GetTypeObj().GetClassToken());
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}
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template<typename T>
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ALWAYS_INLINE void Register(ams::svc::Handle handle, T *obj) {
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static_assert(std::is_base_of<KAutoObject, T>::value);
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return this->Add(handle, obj, obj->GetTypeObj().GetClassToken());
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}
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private:
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NOINLINE Result Add(ams::svc::Handle *out_handle, KAutoObject *obj, u16 type);
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NOINLINE void Register(ams::svc::Handle handle, KAutoObject *obj, u16 type);
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constexpr ALWAYS_INLINE Entry *AllocateEntry() {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(this->count < this->table_size);
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Entry *entry = this->free_head;
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this->free_head = entry->GetNextFreeEntry();
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this->count++;
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this->max_count = std::max(this->max_count, this->count);
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return entry;
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}
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constexpr ALWAYS_INLINE void FreeEntry(Entry *entry) {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(this->count > 0);
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entry->SetFree(this->free_head);
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this->free_head = entry;
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this->count--;
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}
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constexpr ALWAYS_INLINE u16 AllocateLinearId() {
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const u16 id = this->next_linear_id++;
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if (this->next_linear_id > MaxLinearId) {
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this->next_linear_id = MinLinearId;
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}
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return id;
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}
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constexpr ALWAYS_INLINE size_t GetEntryIndex(Entry *entry) {
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const size_t index = entry - this->table;
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MESOSPHERE_ASSERT(index < this->table_size);
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return index;
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}
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constexpr ALWAYS_INLINE Entry *FindEntry(ams::svc::Handle handle) const {
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MESOSPHERE_ASSERT_THIS();
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/* Unpack the handle. */
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const auto handle_pack = GetHandleBitPack(handle);
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const auto raw_value = handle_pack.Get<HandleRawValue>();
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const auto index = handle_pack.Get<HandleIndex>();
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const auto linear_id = handle_pack.Get<HandleLinearId>();
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const auto reserved = handle_pack.Get<HandleReserved>();
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MESOSPHERE_ASSERT(reserved == 0);
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/* Validate our indexing information. */
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if (raw_value == 0) {
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return nullptr;
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}
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if (linear_id == 0) {
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return nullptr;
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}
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if (index >= this->table_size) {
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return nullptr;
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}
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/* Get the entry, and ensure our serial id is correct. */
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Entry *entry = std::addressof(this->table[index]);
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if (entry->GetObject() == nullptr) {
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return nullptr;
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}
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if (entry->GetLinearId() != linear_id) {
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return nullptr;
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}
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return entry;
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}
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constexpr NOINLINE KAutoObject *GetObjectImpl(ams::svc::Handle handle) const {
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MESOSPHERE_ASSERT_THIS();
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/* Handles must not have reserved bits set. */
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if (GetHandleBitPack(handle).Get<HandleReserved>() != 0) {
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return nullptr;
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}
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if (Entry *entry = this->FindEntry(handle); entry != nullptr) {
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return entry->GetObject();
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} else {
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return nullptr;
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}
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}
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constexpr NOINLINE KAutoObject *GetObjectByIndexImpl(ams::svc::Handle *out_handle, size_t index) const {
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MESOSPHERE_ASSERT_THIS();
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/* Index must be in bounds. */
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if (index >= this->table_size || this->table == nullptr) {
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return nullptr;
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}
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/* Ensure entry has an object. */
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Entry *entry = std::addressof(this->table[index]);
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if (entry->GetObject() == nullptr) {
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return nullptr;
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}
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*out_handle = EncodeHandle(index, entry->GetLinearId());
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return entry->GetObject();
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}
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};
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}
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