[PATCH v2 4/8] ArmPkg: skip empty system registers in ArmCpuInfo

["Marcin Juszkiewicz" <marcin.juszkiewicz@linaro.org>]

If system register is empty (value == 0) then do not display information
from it.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
---
 ArmPkg/Application/ArmCpuInfo/ArmCpuInfo.c | 35 +++++++++++++++-------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/ArmPkg/Application/ArmCpuInfo/ArmCpuInfo.c b/ArmPkg/Application/ArmCpuInfo/ArmCpuInfo.c
index 982714ef6ca0..9d0d164774ff 100644
--- a/ArmPkg/Application/ArmCpuInfo/ArmCpuInfo.c
+++ b/ArmPkg/Application/ArmCpuInfo/ArmCpuInfo.c
@@ -2407,23 +2407,38 @@ UefiMain (
 
   HandleAa64Mmfr0 (Aa64Mmfr0);
   PrintSpacer ();
-  HandleAa64Mmfr1 (Aa64Mmfr1, Aa64Pfr0);
-  PrintSpacer ();
-  HandleAa64Mmfr2 (Aa64Mmfr2);
 
-  PrintSpacer ();
+  if (Aa64Mmfr1) {
+    HandleAa64Mmfr1 (Aa64Mmfr1, Aa64Pfr0);
+    PrintSpacer ();
+  }
+
+  if (Aa64Mmfr2) {
+    HandleAa64Mmfr2 (Aa64Mmfr2);
+    PrintSpacer ();
+  }
+
   HandleAa64Pfr0 (Aa64Pfr0, Aa64Pfr1);
   PrintSpacer ();
-  HandleAa64Pfr1 (Aa64Pfr1);
 
-  PrintSpacer ();
+  if (Aa64Pfr1) {
+    HandleAa64Pfr1 (Aa64Pfr1);
+    PrintSpacer ();
+  }
+
   HandleAa64Isar0 (Aa64Isar0);
   PrintSpacer ();
-  HandleAa64Isar1 (Aa64Isar1);
-  PrintSpacer ();
-  HandleAa64Isar2 (Aa64Isar2);
 
-  PrintSpacer ();
+  if (Aa64Isar1) {
+    HandleAa64Isar1 (Aa64Isar1);
+    PrintSpacer ();
+  }
+
+  if (Aa64Isar2) {
+    HandleAa64Isar2 (Aa64Isar2);
+    PrintSpacer ();
+  }
+
   HandleAa64Dfr0 (Aa64Dfr0);
 
   return EFI_SUCCESS;
-- 
2.40.1