mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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334 lines
13 KiB
C++
334 lines
13 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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#include <mesosphere/kern_k_interrupt_event.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 KProcess;
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class KThread;
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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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union EntryInfo {
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u16 linear_id;
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s16 next_free_index;
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constexpr ALWAYS_INLINE u16 GetLinearId() const { return linear_id; }
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constexpr ALWAYS_INLINE s32 GetNextFreeIndex() const { return next_free_index; }
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};
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private:
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EntryInfo m_entry_infos[MaxTableSize];
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KAutoObject *m_objects[MaxTableSize];
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s32 m_free_head_index;
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u16 m_table_size;
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u16 m_max_count;
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u16 m_next_linear_id;
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u16 m_count;
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mutable KSpinLock m_lock;
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public:
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constexpr KHandleTable() :
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m_entry_infos(), m_objects(), m_free_head_index(-1), m_table_size(0), m_max_count(0), m_next_linear_id(MinLinearId), m_count(0), m_lock()
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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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m_max_count = 0;
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m_table_size = (size <= 0) ? MaxTableSize : size;
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m_next_linear_id = MinLinearId;
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m_count = 0;
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m_free_head_index = -1;
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/* Free all entries. */
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for (s32 i = 0; i < static_cast<s32>(m_table_size); ++i) {
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m_objects[i] = nullptr;
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m_entry_infos[i].next_free_index = i - 1;
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m_free_head_index = i;
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}
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return ResultSuccess();
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}
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constexpr ALWAYS_INLINE size_t GetTableSize() const { return m_table_size; }
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constexpr ALWAYS_INLINE size_t GetCount() const { return m_count; }
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constexpr ALWAYS_INLINE size_t GetMaxCount() const { return m_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> GetObjectWithoutPseudoHandle(ams::svc::Handle handle) const {
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/* Lock and look up in table. */
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KScopedDisableDispatch dd;
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KScopedSpinLock lk(m_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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if (auto *obj = this->GetObjectImpl(handle); AMS_LIKELY(obj != nullptr)) {
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return obj->DynamicCast<T*>();
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} else {
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return nullptr;
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}
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}
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}
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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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/* Handle pseudo-handles. */
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if constexpr (std::derived_from<KProcess, T>) {
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if (handle == ams::svc::PseudoHandle::CurrentProcess) {
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auto * const cur_process = GetCurrentProcessPointer();
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AMS_ASSUME(cur_process != nullptr);
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return cur_process;
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}
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} else if constexpr (std::derived_from<KThread, T>) {
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if (handle == ams::svc::PseudoHandle::CurrentThread) {
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auto * const cur_thread = GetCurrentThreadPointer();
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AMS_ASSUME(cur_thread != nullptr);
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return cur_thread;
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}
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}
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return this->template GetObjectWithoutPseudoHandle<T>(handle);
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}
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KScopedAutoObject<KAutoObject> GetObjectForIpcWithoutPseudoHandle(ams::svc::Handle handle) const {
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/* Lock and look up in table. */
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KScopedDisableDispatch dd;
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KScopedSpinLock lk(m_lock);
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KAutoObject *obj = this->GetObjectImpl(handle);
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if (AMS_LIKELY(obj != nullptr)) {
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if (AMS_UNLIKELY(obj->DynamicCast<KInterruptEvent *>() != nullptr)) {
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return nullptr;
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}
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}
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return obj;
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}
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ALWAYS_INLINE KScopedAutoObject<KAutoObject> GetObjectForIpc(ams::svc::Handle handle, KThread *cur_thread) const {
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/* Handle pseudo-handles. */
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AMS_ASSUME(cur_thread != nullptr);
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if (handle == ams::svc::PseudoHandle::CurrentProcess) {
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auto * const cur_process = static_cast<KAutoObject *>(static_cast<void *>(cur_thread->GetOwnerProcess()));
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AMS_ASSUME(cur_process != nullptr);
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return cur_process;
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}
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if (handle == ams::svc::PseudoHandle::CurrentThread) {
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return static_cast<KAutoObject *>(cur_thread);
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}
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return GetObjectForIpcWithoutPseudoHandle(handle);
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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(m_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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NOINLINE Result Add(ams::svc::Handle *out_handle, KAutoObject *obj);
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NOINLINE void Register(ams::svc::Handle handle, KAutoObject *obj);
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template<typename T>
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ALWAYS_INLINE bool GetMultipleObjects(T **out, const ams::svc::Handle *handles, size_t num_handles) const {
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/* Try to convert and open all the handles. */
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size_t num_opened;
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{
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/* Lock the table. */
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KScopedDisableDispatch dd;
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KScopedSpinLock lk(m_lock);
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for (num_opened = 0; num_opened < num_handles; num_opened++) {
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/* Get the current handle. */
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const auto cur_handle = handles[num_opened];
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/* Get the object for the current handle. */
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KAutoObject *cur_object = this->GetObjectImpl(cur_handle);
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if (AMS_UNLIKELY(cur_object == nullptr)) {
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break;
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}
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/* Cast the current object to the desired type. */
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T *cur_t = cur_object->DynamicCast<T*>();
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if (AMS_UNLIKELY(cur_t == nullptr)) {
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break;
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}
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/* Open a reference to the current object. */
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cur_t->Open();
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out[num_opened] = cur_t;
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}
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}
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/* If we converted every object, succeed. */
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if (AMS_LIKELY(num_opened == num_handles)) {
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return true;
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}
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/* If we didn't convert entry object, close the ones we opened. */
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for (size_t i = 0; i < num_opened; i++) {
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out[i]->Close();
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}
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return false;
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}
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private:
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constexpr ALWAYS_INLINE s32 AllocateEntry() {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(m_count < m_table_size);
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const auto index = m_free_head_index;
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m_free_head_index = m_entry_infos[index].GetNextFreeIndex();
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m_max_count = std::max(m_max_count, ++m_count);
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return index;
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}
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constexpr ALWAYS_INLINE void FreeEntry(s32 index) {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(m_count > 0);
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m_objects[index] = nullptr;
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m_entry_infos[index].next_free_index = m_free_head_index;
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m_free_head_index = index;
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--m_count;
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}
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constexpr ALWAYS_INLINE u16 AllocateLinearId() {
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const u16 id = m_next_linear_id++;
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if (m_next_linear_id > MaxLinearId) {
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m_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 bool IsValidHandle(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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MESOSPHERE_UNUSED(reserved);
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/* Validate our indexing information. */
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if (AMS_UNLIKELY(raw_value == 0)) {
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return false;
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}
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if (AMS_UNLIKELY(linear_id == 0)) {
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return false;
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}
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if (AMS_UNLIKELY(index >= m_table_size)) {
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return false;
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}
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/* Check that there's an object, and our serial id is correct. */
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if (AMS_UNLIKELY(m_objects[index] == nullptr)) {
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return false;
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}
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if (AMS_UNLIKELY(m_entry_infos[index].GetLinearId() != linear_id)) {
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return false;
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}
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return true;
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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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const auto handle_pack = GetHandleBitPack(handle);
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if (AMS_UNLIKELY(handle_pack.Get<HandleReserved>() != 0)) {
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return nullptr;
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}
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if (AMS_LIKELY(this->IsValidHandle(handle))) {
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return m_objects[handle_pack.Get<HandleIndex>()];
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} else {
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return nullptr;
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}
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}
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constexpr ALWAYS_INLINE 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 (AMS_UNLIKELY(index >= m_table_size)) {
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return nullptr;
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}
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/* Ensure entry has an object. */
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if (KAutoObject *obj = m_objects[index]; obj != nullptr) {
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*out_handle = EncodeHandle(index, m_entry_infos[index].GetLinearId());
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return obj;
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} else {
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return nullptr;
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}
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}
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};
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}
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