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29f9a38f76
Instead, try to create the device objects in separate static methods, and if we fail for some odd reason to allocate memory for such devices, just panic with that reason.
43 lines
1.4 KiB
C++
43 lines
1.4 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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public:
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static NonnullRefPtr<MemoryDevice> must_create();
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~MemoryDevice();
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virtual KResultOr<Region*> mmap(Process&, FileDescription&, const Range&, u64 offset, int prot, bool shared) override;
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// ^Device
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virtual mode_t required_mode() const override { return 0660; }
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virtual String device_name() const override { return "mem"; };
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private:
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MemoryDevice();
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virtual const char* class_name() const override { return "MemoryDevice"; }
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virtual bool can_read(const FileDescription&, size_t) const override { return true; }
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virtual bool can_write(const FileDescription&, size_t) const override { return false; }
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virtual bool is_seekable() const { return true; }
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virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return -EINVAL; }
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virtual void did_seek(FileDescription&, off_t) override;
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bool is_allowed_range(PhysicalAddress, const Range&) const;
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};
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}
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