[edk2-devel] [PATCH v4 06/11] ArmPkg: Add helper to read CCIDX status

[Rebecca Cran]

Add a helper function to determine CCIDX support.

Signed-off-by: Rebecca Cran <rebecca at nuviainc.com>
---
 ArmPkg/Include/Library/ArmLib.h            |  6 ++++++
 ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c | 12 ++++++++++++
 ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c       | 12 ++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index 5a27b7c2fc27..87c3a6f1ecac 100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -132,6 +132,12 @@ ArmIsArchTimerImplemented (
   VOID
   );
 
+BOOLEAN
+EFIAPI
+ArmIsCcidxImplemented (
+  VOID
+  );
+
 UINTN
 EFIAPI
 ArmReadIdPfr0 (
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
index 3fbd591192e2..915c2cacdd99 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
@@ -71,3 +71,15 @@ ArmCleanDataCache (
   ArmDataSynchronizationBarrier ();
   AArch64DataCacheOperation (ArmCleanDataCacheEntryBySetWay);
 }
+
+BOOLEAN
+EFIAPI
+ArmIsCcidxImplemented (
+  VOID
+  )
+{
+  UINTN Mmfr2;
+
+  Mmfr2 = ArmReadIdMmfr2 ();
+  return (((Mmfr2 >> 20) & 0xF) == 1) ? TRUE : FALSE;
+}
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
index 2c4a23e1a1b2..7331b1c678f3 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
+++ b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
@@ -71,3 +71,15 @@ ArmCleanDataCache (
   ArmDataSynchronizationBarrier ();
   ArmV7DataCacheOperation (ArmCleanDataCacheEntryBySetWay);
 }
+
+BOOLEAN
+EFIAPI
+ArmIsCcidxImplemented (
+  VOID
+  )
+{
+  UINTN Mmfr4;
+
+  Mmfr4 = ArmReadIdMmfr4 ();
+  return (((Mmfr4 >> 24) & 0xF) == 1) ? TRUE : FALSE;
+}
-- 
2.26.2



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