Kernel: Move all Graphics-related code into Devices/GPU directory

Like the HID, Audio and Storage subsystem, the Graphics subsystem (which
handles GPUs technically) exposes unix device files (typically in /dev).
To ensure consistency across the repository, move all related files to a
new directory under Kernel/Devices called "GPU".

Also remove the redundant "GPU" word from the VirtIO driver directory,
and the word "Graphics" from GraphicsManagement.{h,cpp} filenames.

Kernel/Devices/GPU/Bochs/GraphicsAdapter.cpp

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Atomic.h>
+#include <AK/Checked.h>
+#include <AK/Try.h>
+#if ARCH(X86_64)
+#    include <Kernel/Arch/x86_64/Hypervisor/BochsDisplayConnector.h>
+#endif
+#include <Kernel/Bus/PCI/API.h>
+#include <Kernel/Bus/PCI/IDs.h>
+#include <Kernel/Devices/GPU/Bochs/Definitions.h>
+#include <Kernel/Devices/GPU/Bochs/GraphicsAdapter.h>
+#include <Kernel/Devices/GPU/Bochs/QEMUDisplayConnector.h>
+#include <Kernel/Devices/GPU/Console/ContiguousFramebufferConsole.h>
+#include <Kernel/Devices/GPU/Management.h>
+#include <Kernel/Memory/TypedMapping.h>
+#include <Kernel/Sections.h>
+
+namespace Kernel {
+
+UNMAP_AFTER_INIT ErrorOr<bool> BochsGraphicsAdapter::probe(PCI::DeviceIdentifier const& pci_device_identifier)
+{
+    PCI::HardwareID id = pci_device_identifier.hardware_id();
+    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)));
+    MUST(adapter->initialize_adapter(pci_device_identifier));
+    return adapter;
+}
+
+UNMAP_AFTER_INIT BochsGraphicsAdapter::BochsGraphicsAdapter(PCI::DeviceIdentifier const& device_identifier)
+    : PCI::Device(const_cast<PCI::DeviceIdentifier&>(device_identifier))
+{
+}
+
+UNMAP_AFTER_INIT ErrorOr<void> BochsGraphicsAdapter::initialize_adapter(PCI::DeviceIdentifier const& pci_device_identifier)
+{
+    // Note: If we use VirtualBox graphics adapter (which is based on Bochs one), we need to use IO ports
+    // Note: Bochs (the real bochs graphics adapter in the Bochs emulator) uses revision ID of 0x0
+    // and doesn't support memory-mapped IO registers.
+
+    // Note: In non x86-builds, we should never encounter VirtualBox hardware nor Pure Bochs VBE graphics,
+    // so just assume we can use the QEMU BochsVBE-compatible graphics adapter only.
+    auto bar0_space_size = PCI::get_BAR_space_size(pci_device_identifier, PCI::HeaderType0BaseRegister::BAR0);
+#if ARCH(X86_64)
+    bool virtual_box_hardware = (pci_device_identifier.hardware_id().vendor_id == 0x80ee && pci_device_identifier.hardware_id().device_id == 0xbeef);
+    if (pci_device_identifier.revision_id().value() == 0x0 || virtual_box_hardware) {
+        m_display_connector = BochsDisplayConnector::must_create(PhysicalAddress(PCI::get_BAR0(pci_device_identifier) & PCI::bar_address_mask), bar0_space_size, virtual_box_hardware);
+    } else {
+        auto registers_mapping = TRY(Memory::map_typed_writable<BochsDisplayMMIORegisters volatile>(PhysicalAddress(PCI::get_BAR2(pci_device_identifier) & PCI::bar_address_mask)));
+        VERIFY(registers_mapping.region);
+        m_display_connector = QEMUDisplayConnector::must_create(PhysicalAddress(PCI::get_BAR0(pci_device_identifier) & PCI::bar_address_mask), bar0_space_size, move(registers_mapping));
+    }
+#else
+    auto registers_mapping = TRY(Memory::map_typed_writable<BochsDisplayMMIORegisters volatile>(PhysicalAddress(PCI::get_BAR2(pci_device_identifier) & PCI::bar_address_mask)));
+    VERIFY(registers_mapping.region);
+    m_display_connector = QEMUDisplayConnector::must_create(PhysicalAddress(PCI::get_BAR0(pci_device_identifier) & PCI::bar_address_mask), bar0_space_size, move(registers_mapping));
+#endif
+
+    // Note: According to Gerd Hoffmann - "The linux driver simply does
+    // the unblank unconditionally. With bochs-display this is not needed but
+    // it also has no bad side effect".
+    // FIXME: If the error is ENOTIMPL, ignore it for now until we implement
+    // unblank support for VBoxDisplayConnector class too.
+    auto result = m_display_connector->unblank();
+    if (result.is_error() && result.error().code() != ENOTIMPL)
+        return result;
+
+    TRY(m_display_connector->set_safe_mode_setting());
+
+    return {};
+}
+
+}