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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/FixedArray.h>
#include <AK/IntrusiveList.h>
#include <AK/RefPtr.h>
#include <AK/Weakable.h>
#include <Kernel/Forward.h>
#include <Kernel/Library/ListedRefCounted.h>
#include <Kernel/Locking/Mutex.h>
#include <Kernel/Memory/Region.h>
namespace Kernel::Memory {
class VMObject
: public ListedRefCounted<VMObject, LockType::Spinlock>
, public Weakable<VMObject> {
friend class MemoryManager;
friend class Region;
public:
virtual ~VMObject();
virtual ErrorOr<NonnullRefPtr<VMObject>> try_clone() = 0;
virtual bool is_anonymous() const { return false; }
virtual bool is_inode() const { return false; }
virtual bool is_shared_inode() const { return false; }
virtual bool is_private_inode() const { return false; }
size_t page_count() const { return m_physical_pages.size(); }
Span<RefPtr<PhysicalPage> const> physical_pages() const { return m_physical_pages.span(); }
Span<RefPtr<PhysicalPage>> physical_pages() { return m_physical_pages.span(); }
size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
virtual StringView class_name() const = 0;
ALWAYS_INLINE void add_region(Region& region)
{
SpinlockLocker locker(m_lock);
m_regions.append(region);
}
ALWAYS_INLINE void remove_region(Region& region)
{
SpinlockLocker locker(m_lock);
m_regions.remove(region);
}
protected:
static ErrorOr<FixedArray<RefPtr<PhysicalPage>>> try_create_physical_pages(size_t);
ErrorOr<FixedArray<RefPtr<PhysicalPage>>> try_clone_physical_pages() const;
explicit VMObject(FixedArray<RefPtr<PhysicalPage>>&&);
template<typename Callback>
void for_each_region(Callback);
IntrusiveListNode<VMObject> m_list_node;
FixedArray<RefPtr<PhysicalPage>> m_physical_pages;
mutable RecursiveSpinlock m_lock;
private:
VMObject& operator=(VMObject const&) = delete;
VMObject& operator=(VMObject&&) = delete;
VMObject(VMObject&&) = delete;
Region::ListInVMObject m_regions;
public:
using AllInstancesList = IntrusiveList<&VMObject::m_list_node>;
static SpinlockProtected<VMObject::AllInstancesList>& all_instances();
};
template<typename Callback>
inline void VMObject::for_each_region(Callback callback)
{
SpinlockLocker lock(m_lock);
for (auto& region : m_regions) {
callback(region);
}
}
inline PhysicalPage const* Region::physical_page(size_t index) const
{
VERIFY(index < page_count());
return vmobject().physical_pages()[first_page_index() + index];
}
inline RefPtr<PhysicalPage>& Region::physical_page_slot(size_t index)
{
VERIFY(index < page_count());
return vmobject().physical_pages()[first_page_index() + index];
}
}
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