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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Devices/ZeroDevice.h>
#include <Kernel/Sections.h>
namespace Kernel {
UNMAP_AFTER_INIT NonnullLockRefPtr<ZeroDevice> ZeroDevice::must_create()
{
auto zero_device_or_error = DeviceManagement::try_create_device<ZeroDevice>();
// FIXME: Find a way to propagate errors
VERIFY(!zero_device_or_error.is_error());
return zero_device_or_error.release_value();
}
UNMAP_AFTER_INIT ZeroDevice::ZeroDevice()
: CharacterDevice(1, 5)
{
}
UNMAP_AFTER_INIT ZeroDevice::~ZeroDevice() = default;
bool ZeroDevice::can_read(OpenFileDescription const&, u64) const
{
return true;
}
ErrorOr<size_t> ZeroDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
{
TRY(buffer.memset(0, size));
return size;
}
ErrorOr<size_t> ZeroDevice::write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t size)
{
return size;
}
}
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