mirror of
https://github.com/RGBCube/serenity
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4c081e0479
This can be accessed from multiple CPUs at the same time, so relying on the interrupt flag is clearly insufficient.
52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2018-2022, James Mintram <me@jamesrm.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Singleton.h>
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#include <Kernel/Memory/PageDirectory.h>
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#include <Kernel/Thread.h>
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namespace Kernel::Memory {
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struct CR3Map {
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SpinlockProtected<IntrusiveRedBlackTree<&PageDirectory::m_tree_node>> map { LockRank::None };
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};
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static Singleton<CR3Map> s_cr3_map;
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void PageDirectory::register_page_directory(PageDirectory* directory)
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{
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s_cr3_map->map.with([&](auto& map) {
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map.insert(directory->cr3(), *directory);
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});
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}
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void PageDirectory::deregister_page_directory(PageDirectory* directory)
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{
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s_cr3_map->map.with([&](auto& map) {
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map.remove(directory->cr3());
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});
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}
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LockRefPtr<PageDirectory> PageDirectory::find_current()
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{
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return s_cr3_map->map.with([&](auto& map) {
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return map.find(read_cr3());
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});
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}
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void activate_kernel_page_directory(PageDirectory const& pgd)
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{
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write_cr3(pgd.cr3());
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}
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void activate_page_directory(PageDirectory const& pgd, Thread* current_thread)
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{
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current_thread->regs().cr3 = pgd.cr3();
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write_cr3(pgd.cr3());
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}
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}
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