2020-01-18 11:38:21 +03:00
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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2021-04-22 11:24:48 +03:00
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* SPDX-License-Identifier: BSD-2-Clause
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2020-01-18 11:38:21 +03:00
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*/
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2020-03-08 14:33:14 +03:00
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#include <AK/Memory.h>
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2021-09-11 09:19:20 +03:00
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#include <Kernel/Devices/DeviceManagement.h>
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2021-06-22 18:40:16 +03:00
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#include <Kernel/Devices/ZeroDevice.h>
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#include <Kernel/Sections.h>
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2018-10-14 03:59:22 +03:00
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2020-02-16 03:27:42 +03:00
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namespace Kernel {
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2021-06-18 11:37:26 +03:00
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UNMAP_AFTER_INIT NonnullRefPtr<ZeroDevice> ZeroDevice::must_create()
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{
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2021-09-11 09:19:20 +03:00
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auto zero_device_or_error = DeviceManagement::try_create_device<ZeroDevice>();
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2021-09-10 14:44:46 +03:00
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// FIXME: Find a way to propagate errors
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VERIFY(!zero_device_or_error.is_error());
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return zero_device_or_error.release_value();
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2021-06-18 11:37:26 +03:00
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}
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2021-02-19 20:41:50 +03:00
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UNMAP_AFTER_INIT ZeroDevice::ZeroDevice()
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2018-10-30 15:59:29 +03:00
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: CharacterDevice(1, 5)
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2018-10-14 03:59:22 +03:00
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{
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}
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2021-02-19 20:41:50 +03:00
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UNMAP_AFTER_INIT ZeroDevice::~ZeroDevice()
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2018-10-14 03:59:22 +03:00
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{
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}
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2022-01-25 21:17:49 +03:00
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bool ZeroDevice::can_read(const OpenFileDescription&, u64) const
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2018-10-25 14:07:59 +03:00
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{
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return true;
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}
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2021-11-08 02:51:39 +03:00
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ErrorOr<size_t> ZeroDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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2018-10-14 03:59:22 +03:00
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{
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2021-09-07 13:09:52 +03:00
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TRY(buffer.memset(0, size));
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2021-05-27 10:13:49 +03:00
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return size;
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2018-10-14 03:59:22 +03:00
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}
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2021-11-08 02:51:39 +03:00
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ErrorOr<size_t> ZeroDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t size)
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2018-10-14 03:59:22 +03:00
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{
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2021-05-27 10:13:49 +03:00
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return size;
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2018-10-14 03:59:22 +03:00
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}
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2020-02-16 03:27:42 +03:00
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}
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