1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/String.h>
#include <AK/Types.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/PhysicalAddress.h>
namespace Kernel {
class MemoryDevice final : public CharacterDevice {
AK_MAKE_ETERNAL
friend class DeviceManagement;
public:
static NonnullRefPtr<MemoryDevice> must_create();
~MemoryDevice();
virtual KResultOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
private:
MemoryDevice();
virtual StringView class_name() const override { return "MemoryDevice"; }
virtual bool can_read(const OpenFileDescription&, size_t) const override { return true; }
virtual bool can_write(const OpenFileDescription&, size_t) const override { return false; }
virtual bool is_seekable() const override { return true; }
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual void did_seek(OpenFileDescription&, off_t) override;
bool is_allowed_range(PhysicalAddress, Memory::VirtualRange const&) const;
};
}
|
