mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 10:48:11 +00:00
6cd3695761
You're still required to disable interrupts though, as the mappings are per-CPU. This exposed the fact that our CR3 lookup map is insufficiently protected (but we'll address that in a separate commit.)
54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
/*
|
|
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
|
|
* Copyright (c) 2018-2022, James Mintram <me@jamesrm.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Singleton.h>
|
|
|
|
#include <Kernel/Arch/InterruptDisabler.h>
|
|
#include <Kernel/Memory/PageDirectory.h>
|
|
#include <Kernel/Thread.h>
|
|
|
|
namespace Kernel::Memory {
|
|
|
|
// FIXME: This needs real locking:
|
|
static Singleton<IntrusiveRedBlackTree<&PageDirectory::m_tree_node>> s_cr3_map;
|
|
|
|
static IntrusiveRedBlackTree<&PageDirectory::m_tree_node>& cr3_map()
|
|
{
|
|
VERIFY_INTERRUPTS_DISABLED();
|
|
return *s_cr3_map;
|
|
}
|
|
|
|
void PageDirectory::register_page_directory(PageDirectory* directory)
|
|
{
|
|
InterruptDisabler disabler;
|
|
cr3_map().insert(directory->cr3(), *directory);
|
|
}
|
|
|
|
void PageDirectory::deregister_page_directory(PageDirectory* directory)
|
|
{
|
|
InterruptDisabler disabler;
|
|
cr3_map().remove(directory->cr3());
|
|
}
|
|
|
|
LockRefPtr<PageDirectory> PageDirectory::find_current()
|
|
{
|
|
SpinlockLocker lock(s_mm_lock);
|
|
return cr3_map().find(read_cr3());
|
|
}
|
|
|
|
void activate_kernel_page_directory(PageDirectory const& pgd)
|
|
{
|
|
write_cr3(pgd.cr3());
|
|
}
|
|
|
|
void activate_page_directory(PageDirectory const& pgd, Thread* current_thread)
|
|
{
|
|
current_thread->regs().cr3 = pgd.cr3();
|
|
write_cr3(pgd.cr3());
|
|
}
|
|
|
|
}
|