mirror of
https://github.com/RGBCube/serenity
synced 2025-05-30 17:58:11 +00:00
06f1edb516
These are the actual structures that allow USB to work (i.e the ones actually defined in the specification). This should provide us enough of a baseline implementation that we can build on to support different types of USB device.
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
/*
|
|
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/Devices/USB/USBTransfer.h>
|
|
#include <Kernel/VM/MemoryManager.h>
|
|
|
|
namespace Kernel::USB {
|
|
|
|
RefPtr<Transfer> Transfer::try_create(Pipe& pipe, u16 len)
|
|
{
|
|
auto vmobject = ContiguousVMObject::create_with_size(PAGE_SIZE);
|
|
if (!vmobject)
|
|
return nullptr;
|
|
|
|
return adopt_ref_if_nonnull(new Transfer(pipe, len, *vmobject));
|
|
}
|
|
|
|
Transfer::Transfer(Pipe& pipe, u16 len, ContiguousVMObject& vmobject)
|
|
: m_pipe(pipe)
|
|
, m_transfer_data_size(len)
|
|
{
|
|
// Initialize data buffer for transfer
|
|
// This will definitely need to be refactored in the future, I doubt this will scale well...
|
|
m_data_buffer = MemoryManager::the().allocate_kernel_region_with_vmobject(vmobject, PAGE_SIZE, "USB Transfer Buffer", Region::Access::Read | Region::Access::Write);
|
|
}
|
|
|
|
Transfer::~Transfer()
|
|
{
|
|
}
|
|
|
|
void Transfer::set_setup_packet(const USBRequestData& request)
|
|
{
|
|
// Kind of a nasty hack... Because the kernel isn't in the business
|
|
// of handing out physical pointers that we can directly write to,
|
|
// we set the address of the setup packet to be the first 8 bytes of
|
|
// the data buffer, which we then set to the physical address.
|
|
auto* request_data = reinterpret_cast<USBRequestData*>(buffer().as_ptr());
|
|
|
|
request_data->request_type = request.request_type;
|
|
request_data->request = request.request;
|
|
request_data->value = request.value;
|
|
request_data->index = request.index;
|
|
request_data->length = request.length;
|
|
|
|
m_request = request;
|
|
}
|
|
|
|
}
|