jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#pragma once
8
9#include <AK/Types.h>
10#include <Kernel/Devices/CharacterDevice.h>
11#include <Kernel/PhysicalAddress.h>
12
13namespace Kernel {
14
15class MemoryDevice final : public CharacterDevice {
16 friend class DeviceManagement;
17
18public:
19 static NonnullLockRefPtr<MemoryDevice> must_create();
20 ~MemoryDevice();
21
22 virtual ErrorOr<NonnullLockRefPtr<Memory::VMObject>> vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64& offset, bool shared) override;
23
24private:
25 MemoryDevice();
26
27 virtual StringView class_name() const override { return "MemoryDevice"sv; }
28 virtual bool can_read(OpenFileDescription const&, u64) const override { return true; }
29 virtual bool can_write(OpenFileDescription const&, u64) const override { return false; }
30 virtual bool is_seekable() const override { return true; }
31 virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
32 virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override { return EINVAL; }
33};
34
35}