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https://github.com/RGBCube/serenity
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143339767b
Currently when allocating buffers for USB transfers, it is done once for every transfer rather than once upon creation of the USB device. This commit changes that by moving allocation of buffers to the USB Pipe class where they can be reused.
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Bus/USB/USBTransfer.h>
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#include <Kernel/Memory/MemoryManager.h>
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namespace Kernel::USB {
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ErrorOr<NonnullRefPtr<Transfer>> Transfer::try_create(Pipe& pipe, u16 length, Memory::Region& dma_buffer)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) Transfer(pipe, length, dma_buffer));
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}
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Transfer::Transfer(Pipe& pipe, u16 len, Memory::Region& dma_buffer)
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: m_pipe(pipe)
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, m_dma_buffer(dma_buffer)
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, m_transfer_data_size(len)
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{
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}
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Transfer::~Transfer() = default;
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void Transfer::set_setup_packet(USBRequestData const& request)
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{
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// Kind of a nasty hack... Because the kernel isn't in the business
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// of handing out physical pointers that we can directly write to,
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// we set the address of the setup packet to be the first 8 bytes of
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// the data buffer, which we then set to the physical address.
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auto* request_data = reinterpret_cast<USBRequestData*>(buffer().as_ptr());
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request_data->request_type = request.request_type;
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request_data->request = request.request;
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request_data->value = request.value;
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request_data->index = request.index;
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request_data->length = request.length;
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m_request = request;
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}
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ErrorOr<void> Transfer::write_buffer(u16 len, void* data)
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{
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VERIFY(len <= m_dma_buffer.size());
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m_transfer_data_size = len;
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memcpy(buffer().as_ptr(), data, len);
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return {};
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}
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}
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