mirror of
https://github.com/RGBCube/serenity
synced 2025-07-13 13:47:36 +00:00
5e00bb0b9f
This was previously hardcoded this to be the physical memory range, since we identity mapped the memory, however we now run the kernel at a high virtual memory address. Also changes PageDirectory.h to store up-to 512 pages, as the code now needs access to more than 4 pages.
77 lines
2 KiB
C++
77 lines
2 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/AtomicRefCounted.h>
|
|
#include <AK/Badge.h>
|
|
#include <AK/HashMap.h>
|
|
#include <AK/IntrusiveRedBlackTree.h>
|
|
#include <AK/RefPtr.h>
|
|
#include <Kernel/Forward.h>
|
|
#include <Kernel/Locking/Spinlock.h>
|
|
#include <Kernel/Memory/PhysicalPage.h>
|
|
|
|
namespace Kernel::Memory {
|
|
|
|
class PageDirectory final : public AtomicRefCounted<PageDirectory> {
|
|
friend class MemoryManager;
|
|
|
|
public:
|
|
static ErrorOr<NonnullLockRefPtr<PageDirectory>> try_create_for_userspace();
|
|
static NonnullLockRefPtr<PageDirectory> must_create_kernel_page_directory();
|
|
static LockRefPtr<PageDirectory> find_current();
|
|
|
|
~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
|
|
}
|
|
|
|
bool is_cr3_initialized() const
|
|
{
|
|
#if ARCH(X86_64)
|
|
return m_pml4t;
|
|
#else
|
|
return m_directory_table;
|
|
#endif
|
|
}
|
|
|
|
AddressSpace* address_space() { return m_space; }
|
|
AddressSpace const* address_space() const { return m_space; }
|
|
|
|
void set_space(Badge<AddressSpace>, AddressSpace& space) { m_space = &space; }
|
|
|
|
RecursiveSpinlock<LockRank::None>& get_lock() { return m_lock; }
|
|
|
|
// This has to be public to let the global singleton access the member pointer
|
|
IntrusiveRedBlackTreeNode<FlatPtr, PageDirectory, RawPtr<PageDirectory>> m_tree_node;
|
|
|
|
private:
|
|
PageDirectory();
|
|
static void register_page_directory(PageDirectory* directory);
|
|
static void deregister_page_directory(PageDirectory* directory);
|
|
|
|
AddressSpace* m_space { nullptr };
|
|
#if ARCH(X86_64)
|
|
RefPtr<PhysicalPage> m_pml4t;
|
|
#endif
|
|
RefPtr<PhysicalPage> m_directory_table;
|
|
RefPtr<PhysicalPage> m_directory_pages[512];
|
|
RecursiveSpinlock<LockRank::None> m_lock {};
|
|
};
|
|
|
|
void activate_kernel_page_directory(PageDirectory const& pgd);
|
|
void activate_page_directory(PageDirectory const& pgd, Thread* current_thread);
|
|
|
|
}
|