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Kernel/Graphics: Introduce a new mechanism to initialize a PCI device

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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.
This commit is contained in:
Liav A 2022-12-17 21:15:31 +02:00 • committed by Andrew Kaster
parent 7625f7db73
commit 72b144e9e9
12 changed files with 85 additions and 71 deletions
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18
Kernel/Graphics/Bochs/GraphicsAdapter.cpp
View file

@ -22,17 +22,25 @@
namespace Kernel {
UNMAP_AFTER_INIT NonnullLockRefPtr<BochsGraphicsAdapter> BochsGraphicsAdapter::initialize(PCI::DeviceIdentifier const& pci_device_identifier)
UNMAP_AFTER_INIT ErrorOr<bool> BochsGraphicsAdapter::probe(PCI::DeviceIdentifier const& pci_device_identifier)
{
PCI::HardwareID id = pci_device_identifier.hardware_id();
VERIFY((id.vendor_id == PCI::VendorID::QEMUOld && id.device_id == 0x1111) || (id.vendor_id == PCI::VendorID::VirtualBox && id.device_id == 0xbeef));
auto adapter = adopt_lock_ref(*new BochsGraphicsAdapter(pci_device_identifier));
if (id.vendor_id == PCI::VendorID::QEMUOld && id.device_id == 0x1111)
return true;
if (id.vendor_id == PCI::VendorID::VirtualBox && id.device_id == 0xbeef)
return true;
return false;
}
UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<GenericGraphicsAdapter>> BochsGraphicsAdapter::create(PCI::DeviceIdentifier const& pci_device_identifier)
{
auto adapter = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) BochsGraphicsAdapter(pci_device_identifier.address())));
MUST(adapter->initialize_adapter(pci_device_identifier));
return adapter;
}
UNMAP_AFTER_INIT BochsGraphicsAdapter::BochsGraphicsAdapter(PCI::DeviceIdentifier const& pci_device_identifier)
: PCI::Device(pci_device_identifier.address())
UNMAP_AFTER_INIT BochsGraphicsAdapter::BochsGraphicsAdapter(PCI::Address const& address)
: PCI::Device(address)
{
}