mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-05 07:49:09 +00:00
192 lines
6.1 KiB
C++
192 lines
6.1 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_typed_address.hpp>
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namespace ams::kern {
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namespace impl {
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class KSlabHeapImpl {
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NON_COPYABLE(KSlabHeapImpl);
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NON_MOVEABLE(KSlabHeapImpl);
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public:
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struct Node {
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Node *next;
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};
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private:
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std::atomic<Node *> head;
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size_t obj_size;
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public:
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constexpr KSlabHeapImpl() : head(nullptr), obj_size(0) { MESOSPHERE_ASSERT_THIS(); }
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void Initialize(size_t size) {
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MESOSPHERE_INIT_ABORT_UNLESS(this->head == nullptr);
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this->obj_size = size;
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}
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Node *GetHead() const {
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return this->head;
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}
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size_t GetObjectSize() const {
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return this->obj_size;
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}
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void *Allocate() {
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MESOSPHERE_ASSERT_THIS();
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Node *ret = this->head.load();
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do {
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if (AMS_UNLIKELY(ret == nullptr)) {
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break;
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}
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} while (!this->head.compare_exchange_weak(ret, ret->next));
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return ret;
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}
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void Free(void *obj) {
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MESOSPHERE_ASSERT_THIS();
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Node *node = reinterpret_cast<Node *>(obj);
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Node *cur_head = this->head.load();
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do {
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node->next = cur_head;
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} while (!this->head.compare_exchange_weak(cur_head, node));
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}
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};
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}
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class KSlabHeapBase {
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NON_COPYABLE(KSlabHeapBase);
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NON_MOVEABLE(KSlabHeapBase);
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private:
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using Impl = impl::KSlabHeapImpl;
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private:
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Impl impl;
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uintptr_t peak;
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uintptr_t start;
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uintptr_t end;
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private:
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ALWAYS_INLINE Impl *GetImpl() {
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return std::addressof(this->impl);
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}
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ALWAYS_INLINE const Impl *GetImpl() const {
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return std::addressof(this->impl);
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}
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public:
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constexpr KSlabHeapBase() : impl(), peak(0), start(0), end(0) { MESOSPHERE_ASSERT_THIS(); }
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ALWAYS_INLINE bool Contains(uintptr_t address) const {
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return this->start <= address && address < this->end;
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}
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void InitializeImpl(size_t obj_size, void *memory, size_t memory_size) {
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MESOSPHERE_ASSERT_THIS();
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/* Ensure we don't initialize a slab using null memory. */
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MESOSPHERE_ABORT_UNLESS(memory != nullptr);
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/* Initialize the base allocator. */
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this->GetImpl()->Initialize(obj_size);
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/* Set our tracking variables. */
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const size_t num_obj = (memory_size / obj_size);
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this->start = reinterpret_cast<uintptr_t>(memory);
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this->end = this->start + num_obj * obj_size;
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this->peak = this->start;
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/* Free the objects. */
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u8 *cur = reinterpret_cast<u8 *>(this->end);
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for (size_t i = 0; i < num_obj; i++) {
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cur -= obj_size;
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this->GetImpl()->Free(cur);
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}
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}
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size_t GetSlabHeapSize() const {
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return (this->end - this->start) / this->GetObjectSize();
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}
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size_t GetObjectSize() const {
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return this->GetImpl()->GetObjectSize();
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}
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void *AllocateImpl() {
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MESOSPHERE_ASSERT_THIS();
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void *obj = this->GetImpl()->Allocate();
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/* TODO: under some debug define, track the peak for statistics, as N does? */
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return obj;
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}
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void FreeImpl(void *obj) {
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MESOSPHERE_ASSERT_THIS();
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/* Don't allow freeing an object that wasn't allocated from this heap. */
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MESOSPHERE_ABORT_UNLESS(this->Contains(reinterpret_cast<uintptr_t>(obj)));
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this->GetImpl()->Free(obj);
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}
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size_t GetObjectIndexImpl(const void *obj) const {
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return (reinterpret_cast<uintptr_t>(obj) - this->start) / this->GetObjectSize();
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}
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size_t GetPeakIndex() const {
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return this->GetObjectIndexImpl(reinterpret_cast<const void *>(this->peak));
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}
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uintptr_t GetSlabHeapAddress() const {
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return this->start;
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}
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};
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template<typename T>
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class KSlabHeap : public KSlabHeapBase {
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public:
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constexpr KSlabHeap() : KSlabHeapBase() { /* ... */ }
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void Initialize(void *memory, size_t memory_size) {
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this->InitializeImpl(sizeof(T), memory, memory_size);
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}
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T *Allocate() {
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T *obj = reinterpret_cast<T *>(this->AllocateImpl());
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if (AMS_LIKELY(obj != nullptr)) {
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new (obj) T();
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}
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return obj;
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}
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void Free(T *obj) {
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this->FreeImpl(obj);
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}
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size_t GetObjectIndex(const T *obj) const {
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return this->GetObjectIndexImpl(obj);
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}
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};
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}
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