We need to use msr instruction to write system register. It seems the code was simply copied from ArmReadCntkCtl.
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Heyi Guo <heyi....@linaro.org> --- ArmPkg/Library/ArmLib/AArch64/AArch64ArchTimerSupport.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64ArchTimerSupport.S b/ArmPkg/Library/ArmLib/AArch64/AArch64ArchTimerSupport.S index 1ac0108..3944d8b 100644 --- a/ArmPkg/Library/ArmLib/AArch64/AArch64ArchTimerSupport.S +++ b/ArmPkg/Library/ArmLib/AArch64/AArch64ArchTimerSupport.S @@ -58,7 +58,7 @@ ASM_PFX(ArmReadCntkCtl): ASM_PFX(ArmWriteCntkCtl): - mrs x0, cntkctl_el1 // Write to CNTK_CTL (Timer PL1 Control Register) + msr cntkctl_el1, x0 // Write to CNTK_CTL (Timer PL1 Control Register) ret -- 2.1.4 ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
