mirror of
https://github.com/RGBCube/serenity
synced 2025-07-26 06:37:35 +00:00
Kernel: Introduce the MemoryDevice
This is a character device that is being used by the dmidecode utility. We only allow to map the BIOS ROM area to userspace with this device.
This commit is contained in:
parent
df59b80e23
commit
5ab1864497
6 changed files with 235 additions and 0 deletions
61
Kernel/Devices/MemoryDevice.h
Normal file
61
Kernel/Devices/MemoryDevice.h
Normal file
|
@ -0,0 +1,61 @@
|
|||
/*
|
||||
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright notice, this
|
||||
* list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
||||
* this list of conditions and the following disclaimer in the documentation
|
||||
* and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||||
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#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
|
||||
public:
|
||||
MemoryDevice();
|
||||
~MemoryDevice();
|
||||
|
||||
virtual KResultOr<Region*> mmap(Process&, FileDescription&, const Range&, size_t offset, int prot, bool shared) override;
|
||||
|
||||
// ^Device
|
||||
virtual mode_t required_mode() const override { return 0660; }
|
||||
virtual String device_name() const override { return "mem"; };
|
||||
|
||||
private:
|
||||
virtual const char* class_name() const override { return "MemoryDevice"; }
|
||||
virtual bool can_read(const FileDescription&, size_t) const override { return true; }
|
||||
virtual bool can_write(const FileDescription&, size_t) const override { return false; }
|
||||
virtual bool is_seekable() const { return true; }
|
||||
virtual KResultOr<size_t> read(FileDescription&, size_t, UserOrKernelBuffer&, size_t) override;
|
||||
virtual KResultOr<size_t> write(FileDescription&, size_t, const UserOrKernelBuffer&, size_t) override { return -EINVAL; }
|
||||
|
||||
virtual void did_seek(FileDescription&, off_t) override;
|
||||
|
||||
bool is_allowed_range(PhysicalAddress, const Range&) const;
|
||||
};
|
||||
|
||||
}
|
Loading…
Add table
Add a link
Reference in a new issue