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Kernel/PCI: Expose PCI option ROM data from the sysfs interface

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For each exposed PCI device in sysfs, there's a new node called "rom"
and by reading it, it exposes the raw data of a PCI option ROM blob to
a user for examining the blob.
This commit is contained in:
Liav A 2022-02-10 20:35:30 +02:00 • committed by Jelle Raaijmakers
parent 1f9d3a3523
commit a7677f1d9b
6 changed files with 155 additions and 0 deletions
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32
Kernel/FileSystem/SysFS/Subsystems/Bus/PCI/DeviceExpansionROM.h Normal file
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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Vector.h>
#include <Kernel/Bus/PCI/Definitions.h>
#include <Kernel/FileSystem/SysFS/Component.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Bus/PCI/DeviceDirectory.h>
namespace Kernel {
class PCIDeviceExpansionROMSysFSComponent : public SysFSComponent {
public:
static NonnullLockRefPtr<PCIDeviceExpansionROMSysFSComponent> create(PCIDeviceSysFSDirectory const& device);
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const override;
virtual ~PCIDeviceExpansionROMSysFSComponent() {};
virtual StringView name() const override { return "rom"sv; }
protected:
ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer(size_t offset_in_rom, size_t count) const;
PCIDeviceExpansionROMSysFSComponent(PCIDeviceSysFSDirectory const& device, size_t option_rom_size);
NonnullLockRefPtr<PCIDeviceSysFSDirectory> m_device;
size_t const m_option_rom_size { 0 };
};
}