PcAtChipsetPkg/PcRtc: Handle NULL table entry in RSDT/XSDT

The ACPI code may reserve the first entry for a certain table
(might be FACS) to help with OS compatible issues.
We need to skip the NULL table entry in RSDT/XSDT.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>

diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
index 2bb41e7e81a45d1e64ae9124068ca51778a8d093..35e34b74b3a251f1e37f775dcc33156734729679 100644 (file)
--- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
+++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
@@ -1230,6 +1230,11 @@ ScanTableInSDT (
     //\r
     Table = 0;\r
     CopyMem (&Table, (VOID *) (EntryBase + Index * TablePointerSize), TablePointerSize);\r
+\r
+    if (Table == NULL) {\r
+      continue;\r
+    }\r\r
+\r
     if (Table->Signature == Signature) {\r
       return Table;\r
     }\r