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https://github.com/RGBCube/serenity
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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/PhysicalAddress.h>
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namespace Kernel {
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class MemoryDevice final : public CharacterDevice {
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AK_MAKE_ETERNAL
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friend class DeviceManagement;
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public:
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static NonnullRefPtr<MemoryDevice> must_create();
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~MemoryDevice();
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virtual ErrorOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
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private:
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MemoryDevice();
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virtual StringView class_name() const override { return "MemoryDevice"sv; }
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virtual bool can_read(const OpenFileDescription&, size_t) const override { return true; }
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virtual bool can_write(const OpenFileDescription&, size_t) const override { return false; }
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virtual bool is_seekable() const override { return true; }
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
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virtual void did_seek(OpenFileDescription&, off_t) override;
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bool is_allowed_range(PhysicalAddress, Memory::VirtualRange const&) const;
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};
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}
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