[edk2-devel] [PATCH 5/9] ArmPkg: add ArmHasSecurityExtensions () helper function

[Leif Lindholm]

Create a helper function to eliminate direct feature register reading.

Returns BOOLEAN True if the CPU implements the Security extensions,
otherwise returns BOOL False.

This function is only implemented for ARM, not AArch64.

Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
Signed-off-by: Leif Lindholm <leif at nuviainc.com>
---
 ArmPkg/Include/Library/ArmLib.h      | 17 +++++++++++++++++
 ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c | 15 +++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index 8a364f2ca96f..c2ed72112b73 100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -733,4 +733,21 @@ ArmHasGicSystemRegisters (
   VOID
   );
 
+#ifdef MDE_CPU_ARM
+///
+/// AArch32-only ID Register Helper functions
+///
+/**
+  Check whether the CPU supports the Security extensions
+
+  @return   Whether the Security extensions are implemented
+
+**/
+BOOLEAN
+EFIAPI
+ArmHasSecurityExtensions (
+  VOID
+  );
+#endif // MDE_CPU_ARM
+
 #endif // __ARM_LIB__
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
index 3faada3a6539..9f81a7223732 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
+++ b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
@@ -87,3 +87,18 @@ ArmHasGicSystemRegisters (
 {
   return ((ArmReadIdPfr1 () & ARM_PFR1_GIC) != 0);
 }
+
+/**
+  Check whether the CPU supports the Security extensions
+
+  @return   Whether the Security extensions are implemented
+
+**/
+BOOLEAN
+EFIAPI
+ArmHasSecurityExtensions (
+  VOID
+  )
+{
+  return ((ArmReadIdPfr1 () & ARM_PFR1_SEC) != 0);
+}
-- 
2.20.1



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