mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 20:02:44 +00:00
ac7ce12123
This was a premature optimization from the early days of SerenityOS. The eternal heap was a simple bump pointer allocator over a static byte array. My original idea was to avoid heap fragmentation and improve data locality, but both ideas were rooted in cargo culting, not data. We would reserve 4 MiB at boot and only ended up using ~256 KiB, wasting the rest. This patch replaces all kmalloc_eternal() usage by regular kmalloc().
31 lines
893 B
C++
31 lines
893 B
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/Devices/CharacterDevice.h>
|
|
|
|
namespace Kernel {
|
|
|
|
class ZeroDevice final : public CharacterDevice {
|
|
friend class DeviceManagement;
|
|
|
|
public:
|
|
static NonnullRefPtr<ZeroDevice> must_create();
|
|
virtual ~ZeroDevice() override;
|
|
|
|
private:
|
|
ZeroDevice();
|
|
|
|
// ^CharacterDevice
|
|
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
|
|
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
|
|
virtual bool can_read(const OpenFileDescription&, size_t) const override;
|
|
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
|
|
virtual StringView class_name() const override { return "ZeroDevice"sv; }
|
|
};
|
|
|
|
}
|