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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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2
Kernel/IOWindow.cpp
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@ -101,7 +101,7 @@ ErrorOr<NonnullOwnPtr<IOWindow>> IOWindow::create_for_pci_device_bar(PCI::Device
return Error::from_errno(EOVERFLOW);
if (pci_bar_space_type == PCI::BARSpaceType::Memory64BitSpace && Checked<u64>::addition_would_overflow(pci_bar_value, space_length))
return Error::from_errno(EOVERFLOW);
auto memory_mapped_range = TRY(Memory::adopt_new_nonnull_own_typed_mapping<u8 volatile>(PhysicalAddress(pci_bar_value & 0xfffffff0), space_length, Memory::Region::Access::ReadWrite));
auto memory_mapped_range = TRY(Memory::adopt_new_nonnull_own_typed_mapping<u8 volatile>(PhysicalAddress(pci_bar_value & PCI::bar_address_mask), space_length, Memory::Region::Access::ReadWrite));
return TRY(adopt_nonnull_own_or_enomem(new (nothrow) IOWindow(move(memory_mapped_range))));
}