jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/Heap/kmalloc.h>
8#include <Kernel/Memory/MemoryManager.h>
9#include <Kernel/Memory/PhysicalPage.h>
10
11namespace Kernel::Memory {
12
13NonnullRefPtr<PhysicalPage> PhysicalPage::create(PhysicalAddress paddr, MayReturnToFreeList may_return_to_freelist)
14{
15 auto& physical_page_entry = MM.get_physical_page_entry(paddr);
16 return adopt_ref(*new (&physical_page_entry.allocated.physical_page) PhysicalPage(may_return_to_freelist));
17}
18
19PhysicalPage::PhysicalPage(MayReturnToFreeList may_return_to_freelist)
20 : m_may_return_to_freelist(may_return_to_freelist)
21{
22}
23
24PhysicalAddress PhysicalPage::paddr() const
25{
26 return MM.get_physical_address(*this);
27}
28
29void PhysicalPage::free_this() const
30{
31 auto paddr = MM.get_physical_address(*this);
32 if (m_may_return_to_freelist == MayReturnToFreeList::Yes) {
33 auto& this_as_freelist_entry = MM.get_physical_page_entry(paddr).freelist;
34 this->~PhysicalPage(); // delete in place
35 this_as_freelist_entry.next_index = -1;
36 this_as_freelist_entry.prev_index = -1;
37 MM.deallocate_physical_page(paddr);
38 } else {
39 this->~PhysicalPage(); // delete in place
40 }
41}
42
43}