From: Sami Mujawar <sami.muja...@arm.com>
Added helper functions for reading and writing the
CNTHCTL_EL2 register.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Sami Mujawar <sami.muja...@arm.com>
Signed-off-by: Evan Lloyd <evan.ll...@arm.com>
---
ArmPkg/Include/Chipset/AArch64.h | 12 +++++++++++-
ArmPkg/Library/ArmLib/AArch64/AArch64Support.S | 10 ++++++++++
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/ArmPkg/Include/Chipset/AArch64.h b/ArmPkg/Include/Chipset/AArch64.h
index
cebfc5da426a44bb97505ed9c1da3b2b2e35a0cc..76c2cc735ef3196273b28c7a804048d8e1f6d123
100644
--- a/ArmPkg/Include/Chipset/AArch64.h
+++ b/ArmPkg/Include/Chipset/AArch64.h
@@ -1,7 +1,7 @@
/** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
- Copyright (c) 2011 - 2015, ARM Ltd. All rights reserved.<BR>
+ Copyright (c) 2011 - 2017, ARM Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD
License
@@ -235,4 +235,14 @@ ArmWriteCptr (
IN UINT64 Cptr
);
+UINT32
+ArmReadCntHctl (
+ VOID
+ );
+
+VOID
+ArmWriteCntHctl (
+ IN UINT32 CntHctl
+ );
+
#endif // __AARCH64_H__
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
b/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
index
6e8074a4868979d2fa3b850e1e588862179f829a..dde6a756528f3abf1bd5a142448e42122a9bd8fa
100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
@@ -480,4 +480,14 @@ ASM_FUNC(ArmReadCurrentEL)
mrs x0, CurrentEL
ret
+// UINT32 ArmReadCntHctl(VOID)
+ASM_FUNC(ArmReadCntHctl)
+ mrs x0, cnthctl_el2
+ ret
+
+// VOID ArmWriteCntHctl(UINT32 CntHctl)
+ASM_FUNC(ArmWriteCntHctl)
+ msr cnthctl_el2, x0
+ ret
+
ASM_FUNCTION_REMOVE_IF_UNREFERENCED
--
Guid("CE165669-3EF3-493F-B85D-6190EE5B9759")
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