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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
Notes: sideshowbarker 2024-07-17 00:37:23 +09:00 
Author: https://github.com/Panky-codes 🔰
Commit: https://github.com/SerenityOS/serenity/commit/83b87a5ade
Pull-request: https://github.com/SerenityOS/serenity/pull/18484
Reviewed-by: https://github.com/gmta ✅
8 changed files with 14 additions and 15 deletions
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4
Kernel/Bus/PCI/API.cpp
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@ -227,7 +227,7 @@ size_t get_BAR_space_size(DeviceIdentifier const& identifier, HeaderType0BaseReg
write32_offsetted(identifier, field, 0xFFFFFFFF);
u32 space_size = read32_offsetted(identifier, field);
write32_offsetted(identifier, field, bar_reserved);
space_size &= 0xfffffff0;
space_size &= bar_address_mask;
space_size = (~space_size) + 1;
return space_size;
}
@ -240,7 +240,7 @@ size_t get_expansion_rom_space_size(DeviceIdentifier const& identifier)
write32_offsetted(identifier, field, 0xFFFFFFFF);
u32 space_size = read32_offsetted(identifier, field);
write32_offsetted(identifier, field, bar_reserved);
space_size &= 0xfffffff0;
space_size &= bar_address_mask;
space_size = (~space_size) + 1;
return space_size;
}

1
Kernel/Bus/PCI/Definitions.h
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@ -78,6 +78,7 @@ static constexpr u16 value_port = 0xcfc;
static constexpr size_t mmio_device_space_size = 4096;
static constexpr u16 none_value = 0xffff;
static constexpr size_t memory_range_per_bus = mmio_device_space_size * to_underlying(Limits::MaxFunctionsPerDevice) * to_underlying(Limits::MaxDevicesPerBus);
static constexpr u32 bar_address_mask = 0xfffffff0;
// Taken from https://pcisig.com/sites/default/files/files/PCI_Code-ID_r_1_11__v24_Jan_2019.pdf
enum class ClassID {

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

4
Kernel/Graphics/Intel/NativeGraphicsAdapter.cpp
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@ -47,8 +47,8 @@ ErrorOr<void> IntelNativeGraphicsAdapter::initialize_adapter()
dmesgln_pci(*this, "framebuffer @ {}", PhysicalAddress(PCI::get_BAR2(device_identifier())));
using MMIORegion = IntelDisplayConnectorGroup::MMIORegion;
MMIORegion first_region { MMIORegion::BARAssigned::BAR0, PhysicalAddress(PCI::get_BAR0(device_identifier()) & 0xfffffff0), bar0_space_size };
MMIORegion second_region { MMIORegion::BARAssigned::BAR2, PhysicalAddress(PCI::get_BAR2(device_identifier()) & 0xfffffff0), bar2_space_size };
MMIORegion first_region { MMIORegion::BARAssigned::BAR0, PhysicalAddress(PCI::get_BAR0(device_identifier()) & PCI::bar_address_mask), bar0_space_size };
MMIORegion second_region { MMIORegion::BARAssigned::BAR2, PhysicalAddress(PCI::get_BAR2(device_identifier()) & PCI::bar_address_mask), bar2_space_size };
PCI::enable_bus_mastering(device_identifier());
PCI::enable_io_space(device_identifier());

4
Kernel/Graphics/VMWare/GraphicsAdapter.cpp
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@ -69,7 +69,7 @@ UNMAP_AFTER_INIT ErrorOr<void> VMWareGraphicsAdapter::initialize_fifo_registers(
{
auto framebuffer_size = read_io_register(VMWareDisplayRegistersOffset::FB_SIZE);
auto fifo_size = read_io_register(VMWareDisplayRegistersOffset::MEM_SIZE);
auto fifo_physical_address = PhysicalAddress(PCI::get_BAR2(device_identifier()) & 0xfffffff0);
auto fifo_physical_address = PhysicalAddress(PCI::get_BAR2(device_identifier()) & PCI::bar_address_mask);
dbgln("VMWare SVGA @ {}: framebuffer size {} bytes, FIFO size {} bytes @ {}", device_identifier().address(), framebuffer_size, fifo_size, fifo_physical_address);
if (framebuffer_size < 0x100000 || fifo_size < 0x10000) {
@ -185,7 +185,7 @@ UNMAP_AFTER_INIT ErrorOr<void> VMWareGraphicsAdapter::initialize_adapter()
auto bar1_space_size = PCI::get_BAR_space_size(device_identifier(), PCI::HeaderType0BaseRegister::BAR1);
m_display_connector = VMWareDisplayConnector::must_create(*this, PhysicalAddress(PCI::get_BAR1(device_identifier()) & 0xfffffff0), bar1_space_size);
m_display_connector = VMWareDisplayConnector::must_create(*this, PhysicalAddress(PCI::get_BAR1(device_identifier()) & PCI::bar_address_mask), bar1_space_size);
TRY(m_display_connector->set_safe_mode_setting());
return {};
}

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))));
}

2
Kernel/Storage/NVMe/NVMeController.cpp
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@ -40,7 +40,7 @@ UNMAP_AFTER_INIT ErrorOr<void> NVMeController::initialize(bool is_queue_polled)
PCI::enable_memory_space(device_identifier());
PCI::enable_bus_mastering(device_identifier());
m_bar = PCI::get_BAR0(device_identifier()) & BAR_ADDR_MASK;
m_bar = PCI::get_BAR0(device_identifier()) & PCI::bar_address_mask;
static_assert(sizeof(ControllerRegister) == REG_SQ0TDBL_START);
static_assert(sizeof(NVMeSubmission) == (1 << SQ_WIDTH));

2
Kernel/Storage/NVMe/NVMeDefinitions.h
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@ -34,8 +34,6 @@ struct IdentifyNamespace {
u64 rsvd3[488];
};
// BAR
static constexpr u32 BAR_ADDR_MASK = 0xFFFFFFF0;
// DOORBELL
static constexpr u32 REG_SQ0TDBL_START = 0x1000;
static constexpr u32 REG_SQ0TDBL_END = 0x1003;