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| author | Sami Mujawar <sami.mujawar@arm.com> | 2017-05-16 11:10:45 +0100 |
|---|---|---|
| committer | Leif Lindholm <leif.lindholm@linaro.org> | 2017-05-22 15:20:04 +0100 |
| commit | 0e07733023ea26901eec5c51d17e8f38d10d0dea (patch) | |
| tree | e0170c3d693e71abf331fea1e30b32075fe517f6 /ArmPlatformPkg/PrePeiCore | |
| parent | 23d6348f924d27e72acdb3b5747ca26697e677e1 (diff) | |
| download | edk2-0e07733023ea26901eec5c51d17e8f38d10d0dea.tar.gz edk2-0e07733023ea26901eec5c51d17e8f38d10d0dea.tar.bz2 edk2-0e07733023ea26901eec5c51d17e8f38d10d0dea.zip | |
ArmPlatformPkg: Timer access for non-secure EL1/0
According to Section 2.3.6 of the "UEFI Specification 2.6 Errata A";
the primary CPU must be configured such that 'Timer access must be
provided to non-secure EL1 and EL0 by setting bits EL1PCTEN and
EL1PCEN in register CNTHCTL_EL2.'
This commit adds this missing set-up to the PrePi and PrePeiCore
modules.
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>
Diffstat (limited to 'ArmPlatformPkg/PrePeiCore')
| -rw-r--r-- | ArmPlatformPkg/PrePeiCore/AArch64/Helper.S | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/ArmPlatformPkg/PrePeiCore/AArch64/Helper.S b/ArmPlatformPkg/PrePeiCore/AArch64/Helper.S index 5f35484b12..b4f35b7ff5 100644 --- a/ArmPlatformPkg/PrePeiCore/AArch64/Helper.S +++ b/ArmPlatformPkg/PrePeiCore/AArch64/Helper.S @@ -1,5 +1,5 @@ #========================================================================================
-# Copyright (c) 2011-2013, ARM Limited. All rights reserved.
+# Copyright (c) 2011-2017, ARM Limited. All rights reserved.
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
@@ -36,6 +36,13 @@ ASM_FUNC(SetupExceptionLevel2) msr cptr_el2, xzr // Disable copro traps to EL2
+ // Enable Timer access for non-secure EL1 and EL0
+ // The cnthctl_el2 register bits are architecturally
+ // UNKNOWN on reset.
+ // Disable event stream as it is not in use at this stage
+ mov x0, #(CNTHCTL_EL2_EL1PCTEN | CNTHCTL_EL2_EL1PCEN)
+ msr cnthctl_el2, x0
+
ret
ASM_FUNCTION_REMOVE_IF_UNREFERENCED
|