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ArmPkg: Add CNTHCTL_EL2 support functions 

Added helper functions for reading and writing the
CNTHCTL_EL2 register.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Sami Mujawar 2017-05-16 11:10:44 +01:00 committed by Leif Lindholm
parent 7320b8ed18
commit 23d6348f92
2 changed files with 21 additions and 1 deletions
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12
ArmPkg/Include/Chipset/AArch64.h
View File

@ -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__

10
ArmPkg/Library/ArmLib/AArch64/AArch64Support.S
View File

@ -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