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/Devices/DeviceManagement.h>
8#include <Kernel/Devices/ZeroDevice.h>
9#include <Kernel/Sections.h>
10
11namespace Kernel {
12
13UNMAP_AFTER_INIT NonnullLockRefPtr<ZeroDevice> ZeroDevice::must_create()
14{
15 auto zero_device_or_error = DeviceManagement::try_create_device<ZeroDevice>();
16 // FIXME: Find a way to propagate errors
17 VERIFY(!zero_device_or_error.is_error());
18 return zero_device_or_error.release_value();
19}
20
21UNMAP_AFTER_INIT ZeroDevice::ZeroDevice()
22 : CharacterDevice(1, 5)
23{
24}
25
26UNMAP_AFTER_INIT ZeroDevice::~ZeroDevice() = default;
27
28bool ZeroDevice::can_read(OpenFileDescription const&, u64) const
29{
30 return true;
31}
32
33ErrorOr<size_t> ZeroDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
34{
35 TRY(buffer.memset(0, size));
36 return size;
37}
38
39ErrorOr<size_t> ZeroDevice::write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t size)
40{
41 return size;
42}
43
44}