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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Memory.h>
#include <AK/StringView.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/Storage/RamdiskController.h>
#include <Kernel/Storage/RamdiskDevice.h>
namespace Kernel {
NonnullRefPtr<RamdiskDevice> RamdiskDevice::create(const RamdiskController& controller, NonnullOwnPtr<Memory::Region>&& region, int major, int minor)
{
// FIXME: Try to not hardcode a maximum of 16 partitions per drive!
size_t drive_index = minor / 16;
auto device_name = MUST(KString::formatted("ramdisk{}", drive_index));
auto device_or_error = DeviceManagement::try_create_device<RamdiskDevice>(controller, move(region), major, minor, move(device_name));
// FIXME: Find a way to propagate errors
VERIFY(!device_or_error.is_error());
return device_or_error.release_value();
}
RamdiskDevice::RamdiskDevice(const RamdiskController&, NonnullOwnPtr<Memory::Region>&& region, int major, int minor, NonnullOwnPtr<KString> device_name)
: StorageDevice(major, minor, 512, region->size() / 512, move(device_name))
, m_region(move(region))
{
dmesgln("Ramdisk: Device #{} @ {}, Capacity={}", minor, m_region->vaddr(), max_addressable_block() * 512);
}
RamdiskDevice::~RamdiskDevice()
{
}
StringView RamdiskDevice::class_name() const
{
return "RamdiskDevice"sv;
}
void RamdiskDevice::start_request(AsyncBlockDeviceRequest& request)
{
MutexLocker locker(m_lock);
u8* base = m_region->vaddr().as_ptr();
size_t size = m_region->size();
u8* offset = base + request.block_index() * 512;
size_t length = request.block_count() * 512;
if ((offset + length > base + size) || (offset + length < base)) {
request.complete(AsyncDeviceRequest::Failure);
} else {
ErrorOr<void> result;
if (request.request_type() == AsyncBlockDeviceRequest::Read) {
result = request.buffer().write(offset, length);
} else {
result = request.buffer().read(offset, length);
}
request.complete(!result.is_error() ? AsyncDeviceRequest::Success : AsyncDeviceRequest::MemoryFault);
}
}
}
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