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- /*
- * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <Kernel/Bus/PCI/API.h>
- #include <Kernel/Bus/PCI/Access.h>
- #include <Kernel/Bus/PCI/SysFSPCI.h>
- #include <Kernel/Debug.h>
- #include <Kernel/Sections.h>
- namespace Kernel::PCI {
- UNMAP_AFTER_INIT NonnullRefPtr<PCIDeviceSysFSDirectory> PCIDeviceSysFSDirectory::create(const SysFSDirectory& parent_directory, Address address)
- {
- return adopt_ref(*new (nothrow) PCIDeviceSysFSDirectory(parent_directory, address));
- }
- UNMAP_AFTER_INIT PCIDeviceSysFSDirectory::PCIDeviceSysFSDirectory(const SysFSDirectory& parent_directory, Address address)
- : SysFSDirectory(String::formatted("{:04x}:{:02x}:{:02x}.{}", address.domain(), address.bus(), address.device(), address.function()), parent_directory)
- , m_address(address)
- {
- m_components.append(PCIDeviceAttributeSysFSComponent::create("vendor", *this, PCI::RegisterOffset::VENDOR_ID, 2));
- m_components.append(PCIDeviceAttributeSysFSComponent::create("device_id", *this, PCI::RegisterOffset::DEVICE_ID, 2));
- m_components.append(PCIDeviceAttributeSysFSComponent::create("class", *this, PCI::RegisterOffset::CLASS, 1));
- m_components.append(PCIDeviceAttributeSysFSComponent::create("subclass", *this, PCI::RegisterOffset::SUBCLASS, 1));
- m_components.append(PCIDeviceAttributeSysFSComponent::create("revision", *this, PCI::RegisterOffset::REVISION_ID, 1));
- m_components.append(PCIDeviceAttributeSysFSComponent::create("progif", *this, PCI::RegisterOffset::PROG_IF, 1));
- m_components.append(PCIDeviceAttributeSysFSComponent::create("subsystem_vendor", *this, PCI::RegisterOffset::SUBSYSTEM_VENDOR_ID, 2));
- m_components.append(PCIDeviceAttributeSysFSComponent::create("subsystem_id", *this, PCI::RegisterOffset::SUBSYSTEM_ID, 2));
- }
- UNMAP_AFTER_INIT void PCIBusSysFSDirectory::initialize()
- {
- auto pci_directory = adopt_ref(*new (nothrow) PCIBusSysFSDirectory());
- SysFSComponentRegistry::the().register_new_bus_directory(pci_directory);
- }
- UNMAP_AFTER_INIT PCIBusSysFSDirectory::PCIBusSysFSDirectory()
- : SysFSDirectory("pci", SysFSComponentRegistry::the().buses_directory())
- {
- PCI::enumerate([&](DeviceIdentifier const& device_identifier) {
- auto pci_device = PCI::PCIDeviceSysFSDirectory::create(*this, device_identifier.address());
- m_components.append(pci_device);
- });
- }
- NonnullRefPtr<PCIDeviceAttributeSysFSComponent> PCIDeviceAttributeSysFSComponent::create(String name, const PCIDeviceSysFSDirectory& device, PCI::RegisterOffset offset, size_t field_bytes_width)
- {
- return adopt_ref(*new (nothrow) PCIDeviceAttributeSysFSComponent(name, device, offset, field_bytes_width));
- }
- PCIDeviceAttributeSysFSComponent::PCIDeviceAttributeSysFSComponent(String name, const PCIDeviceSysFSDirectory& device, PCI::RegisterOffset offset, size_t field_bytes_width)
- : SysFSComponent(name)
- , m_device(device)
- , m_offset(offset)
- , m_field_bytes_width(field_bytes_width)
- {
- }
- KResultOr<size_t> PCIDeviceAttributeSysFSComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
- {
- auto blob = TRY(try_to_generate_buffer());
- if ((size_t)offset >= blob->size())
- return KSuccess;
- ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count));
- TRY(buffer.write(blob->data() + offset, nread));
- return nread;
- }
- KResultOr<NonnullOwnPtr<KBuffer>> PCIDeviceAttributeSysFSComponent::try_to_generate_buffer() const
- {
- String value;
- switch (m_field_bytes_width) {
- case 1:
- value = String::formatted("{:#x}", PCI::read8(m_device->address(), m_offset));
- break;
- case 2:
- value = String::formatted("{:#x}", PCI::read16(m_device->address(), m_offset));
- break;
- case 4:
- value = String::formatted("{:#x}", PCI::read32(m_device->address(), m_offset));
- break;
- default:
- VERIFY_NOT_REACHED();
- }
- return KBuffer::try_create_with_bytes(value.substring_view(0).bytes());
- }
- }
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