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https://github.com/RGBCube/serenity
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14da080dcf
Previously it would create a contiguous AVMO manually and pass it to MM. This uses supervisor pages that quickly run out as they never get returned and crash the system. Instead, use allocate_kernel_region as we're only allocating a page so it will be contiguous and will be returned when destroyed. A potentially better solution would be to use a pool of transfers to avoid all the allocations. This just prevents the system from crashing within ~5 seconds from the continuous hub polling.
51 lines
1.5 KiB
C++
51 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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RefPtr<Transfer> Transfer::try_create(Pipe& pipe, u16 len)
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{
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// Initialize data buffer for transfer
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// This will definitely need to be refactored in the future, I doubt this will scale well...
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auto data_buffer = MM.allocate_kernel_region(PAGE_SIZE, "USB Transfer Buffer", Memory::Region::Access::ReadWrite);
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if (!data_buffer)
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return {};
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return AK::try_create<Transfer>(pipe, len, data_buffer.release_nonnull());
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}
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Transfer::Transfer(Pipe& pipe, u16 len, NonnullOwnPtr<Memory::Region> data_buffer)
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: m_pipe(pipe)
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, m_data_buffer(move(data_buffer))
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, m_transfer_data_size(len)
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{
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}
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Transfer::~Transfer()
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{
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}
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void Transfer::set_setup_packet(const USBRequestData& 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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}
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