mirror of
https://github.com/RGBCube/serenity
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187723776a
This reverts commit 4e0f85432a as the
ramdisk code is useful for the bring-up of the aarch64 port. Once the
kernel supports better ram-based filesystems, this code will be removed
again.
60 lines
2 KiB
C++
60 lines
2 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Memory.h>
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#include <AK/StringView.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Storage/Ramdisk/Controller.h>
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#include <Kernel/Storage/Ramdisk/Device.h>
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namespace Kernel {
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NonnullLockRefPtr<RamdiskDevice> RamdiskDevice::create(RamdiskController const& controller, NonnullOwnPtr<Memory::Region>&& region, int major, int minor)
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{
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auto device_or_error = DeviceManagement::try_create_device<RamdiskDevice>(controller, move(region), major, minor);
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// FIXME: Find a way to propagate errors
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VERIFY(!device_or_error.is_error());
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return device_or_error.release_value();
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}
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RamdiskDevice::RamdiskDevice(RamdiskController const& controller, NonnullOwnPtr<Memory::Region>&& region, int major, int minor)
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: StorageDevice({}, LUNAddress { controller.controller_id(), 0, 0 }, 0, major, minor, 512, region->size() / 512)
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, m_region(move(region))
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{
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dmesgln("Ramdisk: Device #{} @ {}, Capacity={}", minor, m_region->vaddr(), max_addressable_block() * 512);
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}
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RamdiskDevice::~RamdiskDevice() = default;
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StringView RamdiskDevice::class_name() const
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{
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return "RamdiskDevice"sv;
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}
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void RamdiskDevice::start_request(AsyncBlockDeviceRequest& request)
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{
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MutexLocker locker(m_lock);
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u8* base = m_region->vaddr().as_ptr();
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size_t size = m_region->size();
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u8* offset = base + request.block_index() * request.block_size();
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size_t length = request.buffer_size();
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if ((offset + length > base + size) || (offset + length < base)) {
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request.complete(AsyncDeviceRequest::Failure);
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} else {
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ErrorOr<void> result;
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if (request.request_type() == AsyncBlockDeviceRequest::Read) {
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result = request.buffer().write(offset, length);
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} else {
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result = request.buffer().read(offset, length);
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}
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request.complete(!result.is_error() ? AsyncDeviceRequest::Success : AsyncDeviceRequest::MemoryFault);
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}
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}
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}
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