[edk2-devel] [PATCH v5 09/23] 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>
Reviewed-by: Sami Mujawar <sami.mujawar at arm.com>
---
 ArmPkg/Include/Library/ArmLib.h            | 11 +++++++++++
 ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c | 17 +++++++++++++++++
 ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c       | 17 +++++++++++++++++
 3 files changed, 45 insertions(+)

diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index fd4f06d24274..70b9d816b74c 100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -725,6 +725,17 @@ ArmHasGicSystemRegisters (
   VOID
   );
 
+/** Checks if CCIDX is implemented.
+
+   @retval TRUE  CCIDX is implemented.
+   @retval FALSE CCIDX is not implemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasCcidx (
+  VOID
+  );
+
 #ifdef MDE_CPU_ARM
 ///
 /// AArch32-only ID Register Helper functions
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
index 53e593bc994b..f0bf897da2a6 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
@@ -87,3 +87,20 @@ ArmHasGicSystemRegisters (
 {
   return ((ArmReadIdAA64Pfr0 () & AARCH64_PFR0_GIC) != 0);
 }
+
+/** Checks if CCIDX is implemented.
+
+   @retval TRUE  CCIDX is implemented.
+   @retval FALSE CCIDX is not implemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasCcidx (
+  VOID
+  )
+{
+  UINTN Mmfr2;
+
+  Mmfr2 = ArmReadIdAA64Mmfr2 ();
+  return (((Mmfr2 >> 20) & 0xF) == 1) ? TRUE : FALSE;
+}
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
index 9f81a7223732..f5f1939c8fa4 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
+++ b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
@@ -102,3 +102,20 @@ ArmHasSecurityExtensions (
 {
   return ((ArmReadIdPfr1 () & ARM_PFR1_SEC) != 0);
 }
+
+/** Checks if CCIDX is implemented.
+
+   @retval TRUE  CCIDX is implemented.
+   @retval FALSE CCIDX is not implemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasCcidx (
+  VOID
+  )
+{
+  UINTN Mmfr4;
+
+  Mmfr4 = ArmReadIdMmfr4 ();
+  return (((Mmfr4 >> 24) & 0xF) == 1) ? TRUE : FALSE;
+}
-- 
2.26.2



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