CorebootPayloadPkg/PciHostBridgeLib: clear aperture vars for (re)init

Use ZeroMem() to initialize (or re-initialize) all fields in temporary
PCI_ROOT_BRIDGE_APERTURE variables to zero. This is not mandatory but
helpful for future extension: when we add new fields to
PCI_ROOT_BRIDGE_APERTURE and the default value of these fields can
safely be zero, this code will not suffer from an additional change.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
Signed-off-by: Yi Li <phoenix.liyi@huawei.com>
Reviewed-by: Ni Ruiyu <ruiyu.ni@intel.com>
Reviewed-by: Benjamin You <benjamin.you@intel.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/CorebootPayloadPkg/Library/PciHostBridgeLib/PciHostBridgeSupport.c b/CorebootPayloadPkg/Library/PciHostBridgeLib/PciHostBridgeSupport.c
index 6d94ff72c9..18dcbafdf0 100644
--- a/CorebootPayloadPkg/Library/PciHostBridgeLib/PciHostBridgeSupport.c
+++ b/CorebootPayloadPkg/Library/PciHostBridgeLib/PciHostBridgeSupport.c
@@ -328,8 +328,13 @@ ScanForRootBridges (
   for (PrimaryBus = 0; PrimaryBus <= PCI_MAX_BUS; PrimaryBus = SubBus + 1) {

     SubBus = PrimaryBus;

     Attributes = 0;

+

+    ZeroMem (&Io, sizeof (Io));

+    ZeroMem (&Mem, sizeof (Mem));

+    ZeroMem (&MemAbove4G, sizeof (MemAbove4G));

+    ZeroMem (&PMem, sizeof (PMem));

+    ZeroMem (&PMemAbove4G, sizeof (PMemAbove4G));

     Io.Base = Mem.Base = MemAbove4G.Base = PMem.Base = PMemAbove4G.Base = MAX_UINT64;

-    Io.Limit = Mem.Limit = MemAbove4G.Limit = PMem.Limit = PMemAbove4G.Limit = 0;

     //

     // Scan all the PCI devices on the primary bus of the PCI root bridge

     //