2020-01-18 08:38:21 +00:00
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/*
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2021-08-06 11:49:36 +00:00
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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2020-01-18 08:38:21 +00:00
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*
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2021-04-22 08:24:48 +00:00
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* SPDX-License-Identifier: BSD-2-Clause
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2020-01-18 08:38:21 +00:00
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*/
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2019-04-03 13:13:07 +00:00
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#pragma once
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2021-07-11 15:38:28 +00:00
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#include <AK/FixedArray.h>
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2021-05-26 09:57:46 +00:00
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#include <AK/IntrusiveList.h>
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2019-08-07 16:06:17 +00:00
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#include <AK/RefPtr.h>
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2019-05-28 09:53:16 +00:00
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#include <AK/Weakable.h>
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2021-07-11 09:49:16 +00:00
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#include <Kernel/Forward.h>
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2021-08-16 20:54:25 +00:00
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#include <Kernel/Library/ListedRefCounted.h>
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2021-07-18 07:10:27 +00:00
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#include <Kernel/Locking/Mutex.h>
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2021-08-06 08:45:34 +00:00
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#include <Kernel/Memory/Region.h>
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2019-04-03 13:13:07 +00:00
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2021-08-06 11:49:36 +00:00
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namespace Kernel::Memory {
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2020-02-16 00:27:42 +00:00
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2021-08-16 20:54:25 +00:00
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class VMObject
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: public ListedRefCounted<VMObject>
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, public Weakable<VMObject> {
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friend class MemoryManager;
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2019-11-03 23:45:33 +00:00
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friend class Region;
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2019-05-28 09:53:16 +00:00
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2019-04-03 13:13:07 +00:00
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public:
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virtual ~VMObject();
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2021-08-15 09:07:59 +00:00
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virtual KResultOr<NonnullRefPtr<VMObject>> try_clone() = 0;
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virtual bool is_anonymous() const { return false; }
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virtual bool is_inode() const { return false; }
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2020-03-01 10:08:28 +00:00
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virtual bool is_shared_inode() const { return false; }
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virtual bool is_private_inode() const { return false; }
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2019-04-03 13:13:07 +00:00
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2019-08-07 18:12:50 +00:00
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size_t page_count() const { return m_physical_pages.size(); }
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2021-07-11 15:19:07 +00:00
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Span<RefPtr<PhysicalPage> const> physical_pages() const { return m_physical_pages.span(); }
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Span<RefPtr<PhysicalPage>> physical_pages() { return m_physical_pages.span(); }
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size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
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2021-07-11 15:57:52 +00:00
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virtual StringView class_name() const = 0;
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2020-02-28 19:58:57 +00:00
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2021-07-23 00:40:16 +00:00
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ALWAYS_INLINE void add_region(Region& region)
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{
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ScopedSpinlock locker(m_lock);
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m_regions.append(region);
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}
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ALWAYS_INLINE void remove_region(Region& region)
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{
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ScopedSpinlock locker(m_lock);
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m_regions.remove(region);
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}
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protected:
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explicit VMObject(size_t);
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explicit VMObject(VMObject const&);
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template<typename Callback>
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void for_each_region(Callback);
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IntrusiveListNode<VMObject> m_list_node;
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FixedArray<RefPtr<PhysicalPage>> m_physical_pages;
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2021-08-21 23:37:17 +00:00
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mutable RecursiveSpinlock m_lock;
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2020-09-05 21:52:14 +00:00
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2019-08-07 16:06:17 +00:00
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private:
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VMObject& operator=(VMObject const&) = delete;
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VMObject& operator=(VMObject&&) = delete;
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VMObject(VMObject&&) = delete;
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2021-01-02 19:03:14 +00:00
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2021-07-23 00:40:16 +00:00
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Region::ListInVMObject m_regions;
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public:
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using AllInstancesList = IntrusiveList<VMObject, RawPtr<VMObject>, &VMObject::m_list_node>;
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static SpinlockProtected<VMObject::AllInstancesList>& all_instances();
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};
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2020-02-16 00:27:42 +00:00
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2021-07-23 00:40:16 +00:00
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template<typename Callback>
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inline void VMObject::for_each_region(Callback callback)
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{
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ScopedSpinlock lock(m_lock);
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for (auto& region : m_regions) {
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callback(region);
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}
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}
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inline PhysicalPage const* Region::physical_page(size_t index) const
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{
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VERIFY(index < page_count());
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return vmobject().physical_pages()[first_page_index() + index];
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}
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inline RefPtr<PhysicalPage>& Region::physical_page_slot(size_t index)
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{
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VERIFY(index < page_count());
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return vmobject().physical_pages()[first_page_index() + index];
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}
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2020-02-16 00:27:42 +00:00
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}
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