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Kernel: Add bar_address_mask to mask the last 4 bits of a BAR address

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Create a bar_address_mask constant to mask the last 4 bits of a BAR
address instead of hand coding the mask all over the kernel.
This commit is contained in:
Pankaj Raghav 2023-04-24 12:32:12 +02:00 • committed by Jelle Raaijmakers
parent 20d517f1da
commit 83b87a5ade
8 changed files with 14 additions and 15 deletions
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10
Kernel/Graphics/Bochs/GraphicsAdapter.cpp
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@ -56,16 +56,16 @@ UNMAP_AFTER_INIT ErrorOr<void> BochsGraphicsAdapter::initialize_adapter(PCI::Dev
#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) & 0xfffffff0), bar0_space_size, 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) & 0xfffffff0)));
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) & 0xfffffff0), bar0_space_size, move(registers_mapping));
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) & 0xfffffff0)));
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) & 0xfffffff0), bar0_space_size, move(registers_mapping));
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