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4a9c18afb9
Dr. POSIX really calls these "open file description", not just "file description", so let's call them exactly that. :^)
96 lines
3.8 KiB
C++
96 lines
3.8 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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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/PCI/API.h>
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#include <Kernel/Bus/PCI/Access.h>
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#include <Kernel/Bus/PCI/SysFSPCI.h>
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#include <Kernel/Debug.h>
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#include <Kernel/IO.h>
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#include <Kernel/Sections.h>
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namespace Kernel::PCI {
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UNMAP_AFTER_INIT NonnullRefPtr<PCIDeviceSysFSDirectory> PCIDeviceSysFSDirectory::create(const SysFSDirectory& parent_directory, Address address)
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{
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return adopt_ref(*new (nothrow) PCIDeviceSysFSDirectory(parent_directory, address));
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}
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UNMAP_AFTER_INIT PCIDeviceSysFSDirectory::PCIDeviceSysFSDirectory(const SysFSDirectory& parent_directory, Address address)
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: SysFSDirectory(String::formatted("{:04x}:{:02x}:{:02x}.{}", address.domain(), address.bus(), address.device(), address.function()), parent_directory)
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, m_address(address)
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{
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m_components.append(PCIDeviceAttributeSysFSComponent::create("vendor", *this, PCI_VENDOR_ID, 2));
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m_components.append(PCIDeviceAttributeSysFSComponent::create("device_id", *this, PCI_DEVICE_ID, 2));
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m_components.append(PCIDeviceAttributeSysFSComponent::create("class", *this, PCI_CLASS, 1));
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m_components.append(PCIDeviceAttributeSysFSComponent::create("subclass", *this, PCI_SUBCLASS, 1));
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m_components.append(PCIDeviceAttributeSysFSComponent::create("revision", *this, PCI_REVISION_ID, 1));
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m_components.append(PCIDeviceAttributeSysFSComponent::create("progif", *this, PCI_PROG_IF, 1));
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m_components.append(PCIDeviceAttributeSysFSComponent::create("subsystem_vendor", *this, PCI_SUBSYSTEM_VENDOR_ID, 2));
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m_components.append(PCIDeviceAttributeSysFSComponent::create("subsystem_id", *this, PCI_SUBSYSTEM_ID, 2));
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}
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UNMAP_AFTER_INIT void PCIBusSysFSDirectory::initialize()
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{
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auto pci_directory = adopt_ref(*new (nothrow) PCIBusSysFSDirectory());
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SysFSComponentRegistry::the().register_new_component(pci_directory);
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}
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UNMAP_AFTER_INIT PCIBusSysFSDirectory::PCIBusSysFSDirectory()
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: SysFSDirectory("pci", SysFSComponentRegistry::the().root_directory())
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{
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PCI::enumerate([&](const Address& address, ID) {
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auto pci_device = PCI::PCIDeviceSysFSDirectory::create(*this, address);
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m_components.append(pci_device);
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});
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}
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NonnullRefPtr<PCIDeviceAttributeSysFSComponent> PCIDeviceAttributeSysFSComponent::create(String name, const PCIDeviceSysFSDirectory& device, size_t offset, size_t field_bytes_width)
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{
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return adopt_ref(*new (nothrow) PCIDeviceAttributeSysFSComponent(name, device, offset, field_bytes_width));
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}
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PCIDeviceAttributeSysFSComponent::PCIDeviceAttributeSysFSComponent(String name, const PCIDeviceSysFSDirectory& device, size_t offset, size_t field_bytes_width)
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: SysFSComponent(name)
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, m_device(device)
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, m_offset(offset)
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, m_field_bytes_width(field_bytes_width)
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{
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}
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KResultOr<size_t> PCIDeviceAttributeSysFSComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
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{
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auto blob = try_to_generate_buffer();
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if (!blob)
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return KResult(EFAULT);
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if ((size_t)offset >= blob->size())
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return KSuccess;
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ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count));
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TRY(buffer.write(blob->data() + offset, nread));
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return nread;
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}
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OwnPtr<KBuffer> PCIDeviceAttributeSysFSComponent::try_to_generate_buffer() const
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{
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String value;
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switch (m_field_bytes_width) {
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case 1:
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value = String::formatted("{:#x}", PCI::read8(m_device->address(), m_offset));
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break;
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case 2:
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value = String::formatted("{:#x}", PCI::read16(m_device->address(), m_offset));
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break;
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case 4:
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value = String::formatted("{:#x}", PCI::read32(m_device->address(), m_offset));
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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return KBuffer::try_create_with_bytes(value.substring_view(0).bytes());
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}
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}
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