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Kernel/Graphics: Introduce a new mechanism to initialize a PCI device
Instead of using a clunky switch-case paradigm, we now have all drivers being declaring two methods for their adapter class - create and probe. These methods are linked in each PCIGraphicsDriverInitializer structure, in a new s_initializers static list of them. Then, when we probe for a PCI device, we use each probe method and if there's a match, then the corresponding create method is called. As a result of this change, it's much more easy to add more drivers and the initialization code is more readable.
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12 changed files with 85 additions and 71 deletions
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@ -26,13 +26,15 @@ static bool is_supported_model(u16 device_id)
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return false;
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}
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LockRefPtr<IntelNativeGraphicsAdapter> IntelNativeGraphicsAdapter::initialize(PCI::DeviceIdentifier const& pci_device_identifier)
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ErrorOr<bool> IntelNativeGraphicsAdapter::probe(PCI::DeviceIdentifier const& pci_device_identifier)
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{
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VERIFY(pci_device_identifier.hardware_id().vendor_id == 0x8086);
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if (!is_supported_model(pci_device_identifier.hardware_id().device_id))
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return {};
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auto adapter = adopt_lock_ref(*new IntelNativeGraphicsAdapter(pci_device_identifier.address()));
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MUST(adapter->initialize_adapter());
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return is_supported_model(pci_device_identifier.hardware_id().device_id);
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}
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ErrorOr<NonnullLockRefPtr<GenericGraphicsAdapter>> IntelNativeGraphicsAdapter::create(PCI::DeviceIdentifier const& pci_device_identifier)
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{
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auto adapter = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) IntelNativeGraphicsAdapter(pci_device_identifier.address())));
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TRY(adapter->initialize_adapter());
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return adapter;
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}
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@ -47,7 +49,7 @@ ErrorOr<void> IntelNativeGraphicsAdapter::initialize_adapter()
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dmesgln_pci(*this, "framebuffer @ {}", PhysicalAddress(PCI::get_BAR2(address)));
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PCI::enable_bus_mastering(address);
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m_display_connector = IntelNativeDisplayConnector::must_create(PhysicalAddress(PCI::get_BAR2(address) & 0xfffffff0), bar2_space_size, PhysicalAddress(PCI::get_BAR0(address) & 0xfffffff0), bar0_space_size);
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m_display_connector = TRY(IntelNativeDisplayConnector::try_create(PhysicalAddress(PCI::get_BAR2(address) & 0xfffffff0), bar2_space_size, PhysicalAddress(PCI::get_BAR0(address) & 0xfffffff0), bar0_space_size));
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return {};
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}
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