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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/HashMap.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <Kernel/Forward.h>
#include <Kernel/VM/PhysicalPage.h>
#include <Kernel/VM/RangeAllocator.h>
namespace Kernel {
class PageDirectory : public RefCounted<PageDirectory> {
friend class MemoryManager;
public:
static RefPtr<PageDirectory> create_for_userspace(const RangeAllocator* parent_range_allocator = nullptr)
{
auto page_directory = adopt_ref(*new PageDirectory(parent_range_allocator));
if (!page_directory->is_valid())
return {};
return page_directory;
}
static NonnullRefPtr<PageDirectory> create_kernel_page_directory() { return adopt_ref(*new PageDirectory); }
static RefPtr<PageDirectory> find_by_cr3(FlatPtr);
~PageDirectory();
void allocate_kernel_directory();
FlatPtr cr3() const
{
#if ARCH(X86_64)
return m_pml4t->paddr().get();
#else
return m_directory_table->paddr().get();
#endif
}
RangeAllocator& range_allocator() { return m_range_allocator; }
const RangeAllocator& range_allocator() const { return m_range_allocator; }
RangeAllocator& identity_range_allocator() { return m_identity_range_allocator; }
bool is_valid() const { return m_valid; }
Space* space() { return m_space; }
const Space* space() const { return m_space; }
void set_space(Badge<Space>, Space& space) { m_space = &space; }
RecursiveSpinLock& get_lock() { return m_lock; }
private:
explicit PageDirectory(const RangeAllocator* parent_range_allocator);
PageDirectory();
Space* m_space { nullptr };
RangeAllocator m_range_allocator;
RangeAllocator m_identity_range_allocator;
#if ARCH(X86_64)
RefPtr<PhysicalPage> m_pml4t;
#endif
RefPtr<PhysicalPage> m_directory_table;
RefPtr<PhysicalPage> m_directory_pages[4];
HashMap<u32, RefPtr<PhysicalPage>> m_page_tables;
RecursiveSpinLock m_lock;
bool m_valid { false };
};
}
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