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https://github.com/RGBCube/serenity
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88d490566f
try_*() implies that it can fail (and they all return RefPtr with nullptr signalling failure.)
51 lines
1.6 KiB
C++
51 lines
1.6 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/VM/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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auto vmobject = ContiguousVMObject::try_create_with_size(PAGE_SIZE);
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if (!vmobject)
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return nullptr;
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return AK::try_create<Transfer>(pipe, len, *vmobject);
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}
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Transfer::Transfer(Pipe& pipe, u16 len, ContiguousVMObject& vmobject)
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: m_pipe(pipe)
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, m_transfer_data_size(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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m_data_buffer = MemoryManager::the().allocate_kernel_region_with_vmobject(vmobject, PAGE_SIZE, "USB Transfer Buffer", Region::Access::Read | Region::Access::Write);
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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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