mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 11:28:12 +00:00
d1f265e851
This commit moves the allocation of the resources required for VMObject from its constructors to the constructors of its child classes. We're making this change to give the child classes the chance to expose the fallibility of the allocation.
104 lines
3 KiB
C++
104 lines
3 KiB
C++
/*
|
|
* 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);
|
|
static FixedArray<RefPtr<PhysicalPage>> must_create_physical_pages_but_fixme_should_propagate_errors(size_t);
|
|
ErrorOr<FixedArray<RefPtr<PhysicalPage>>> try_clone_physical_pages() const;
|
|
FixedArray<RefPtr<PhysicalPage>> must_clone_physical_pages_but_fixme_should_propagate_errors() 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];
|
|
}
|
|
|
|
}
|