ladybird/Kernel/Memory/PhysicalPage.cpp
Andreas Kling 8bf248a046 Kernel: Make NNRP<PhysicalPage const> possible
This wasn't possible before as ref() and unref() were non-const.
2023-02-21 00:54:04 +01:00

44 lines
1.3 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Heap/kmalloc.h>
#include <Kernel/Memory/MemoryManager.h>
#include <Kernel/Memory/PhysicalPage.h>
namespace Kernel::Memory {
NonnullRefPtr<PhysicalPage> PhysicalPage::create(PhysicalAddress paddr, MayReturnToFreeList may_return_to_freelist)
{
auto& physical_page_entry = MM.get_physical_page_entry(paddr);
return adopt_ref(*new (&physical_page_entry.allocated.physical_page) PhysicalPage(may_return_to_freelist));
}
PhysicalPage::PhysicalPage(MayReturnToFreeList may_return_to_freelist)
: m_may_return_to_freelist(may_return_to_freelist)
{
}
PhysicalAddress PhysicalPage::paddr() const
{
return MM.get_physical_address(*this);
}
void PhysicalPage::free_this() const
{
auto paddr = MM.get_physical_address(*this);
if (m_may_return_to_freelist == MayReturnToFreeList::Yes) {
auto& this_as_freelist_entry = MM.get_physical_page_entry(paddr).freelist;
this->~PhysicalPage(); // delete in place
this_as_freelist_entry.next_index = -1;
this_as_freelist_entry.prev_index = -1;
MM.deallocate_physical_page(paddr);
} else {
this->~PhysicalPage(); // delete in place
}
}
}