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https://github.com/RGBCube/serenity
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6a537ceef1
We don't need an entirely separate VMObject subclass to influence the location of the physical pages. Instead, we simply allocate enough physically contiguous memory first, and then pass it to the AnonymousVMObject constructor that takes a span of physical pages.
51 lines
1.8 KiB
C++
51 lines
1.8 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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#pragma once
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#include <AK/OwnPtr.h>
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#include <AK/RefPtr.h>
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#include <Kernel/Bus/USB/PacketTypes.h>
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#include <Kernel/Bus/USB/USBPipe.h>
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#include <Kernel/VM/AnonymousVMObject.h>
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#include <Kernel/VM/PhysicalPage.h>
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#include <Kernel/VM/Region.h>
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// TODO: Callback stuff in this class please!
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namespace Kernel::USB {
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class Transfer : public RefCounted<Transfer> {
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public:
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static RefPtr<Transfer> try_create(Pipe& pipe, u16 len);
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public:
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Transfer() = delete;
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Transfer(Pipe& pipe, u16 len, AnonymousVMObject&);
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~Transfer();
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void set_setup_packet(const USBRequestData& request);
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void set_complete() { m_complete = true; }
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void set_error_occurred() { m_error_occurred = true; }
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// `const` here makes sure we don't blow up by writing to a physical address
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const USBRequestData& request() const { return m_request; }
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const Pipe& pipe() const { return m_pipe; }
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Pipe& pipe() { return m_pipe; }
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VirtualAddress buffer() const { return m_data_buffer->vaddr(); }
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PhysicalAddress buffer_physical() const { return m_data_buffer->physical_page(0)->paddr(); }
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u16 transfer_data_size() const { return m_transfer_data_size; }
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bool complete() const { return m_complete; }
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bool error_occurred() const { return m_error_occurred; }
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private:
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Pipe& m_pipe; // Pipe that initiated this transfer
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USBRequestData m_request; // USB request
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OwnPtr<Region> m_data_buffer; // DMA Data buffer for transaction
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u16 m_transfer_data_size { 0 }; // Size of the transfer's data stage
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bool m_complete { false }; // Has this transfer been completed?
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bool m_error_occurred { false }; // Did an error occur during this transfer?
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};
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}
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