According to UEFI spec 2.7, PciIo->GetBarAttributes should return host address (CPU view ddress) rather than device address (PCI view address), and device address = host address + address translation offset, so we subtract translation from device address before returning.
Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Heyi Guo <[email protected]> Cc: Ruiyu Ni <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Star Zeng <[email protected]> Cc: Eric Dong <[email protected]> Cc: Laszlo Ersek <[email protected]> Cc: Michael D Kinney <[email protected]> --- MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c index fef3eceb7f62..62179eb44bbd 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c @@ -1972,6 +1972,10 @@ PciIoGetBarAttributes ( return EFI_UNSUPPORTED; } } + + // According to UEFI spec 2.7, we need return host address for + // PciIo->GetBarAttributes, and host address = device address - translation. + Descriptor->AddrRangeMin -= Descriptor->AddrTranslationOffset; } return EFI_SUCCESS; -- 2.7.4 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
