UefiCpuPkg/BaseRiscV64CpuTimerLib: Add constructor to initialize mTimeBase

mTimeBase is currently initialized only when timer functions are invoked
during boot. This requires reading data from a HOB, but accessing HOBs
during runtime EFI calls can trigger a kernel panic because the virtual
address change event for HOB addresses is not implemented.

To address this, a constructor function is added so that mTimeBase is
initialized before the kernel boots, avoiding any runtime access to
HOB data.

Fixes: #11747

Signed-off-by: Chao Liu <chao.liu.riscv@isrc.iscas.ac.cn>
Signed-off-by: Tuan Phan <tuan.phan@oss.qualcomm.com>

UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf

@@ -16,6 +16,7 @@
   VERSION_STRING                 = 1.0
   LIBRARY_CLASS                  = TimerLib
   MODULE_UNI_FILE                = BaseRisV64CpuTimerLib.uni
+  CONSTRUCTOR                    = BaseRiscV64CpuTimerLibConstructor
 
 [Sources]
   CpuTimerLib.c

UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/CpuTimerLib.c

@@ -262,3 +262,24 @@ GetTimeInNanoSecond (
 
   return NanoSeconds;
 }
+
+/**
+  Constructor function for the Timer Library.
+
+  This constructor function is called early during booting to ensure that
+  GetPerformanceCounterProperties() is invoked and mTimeBase is initialized
+  before any code that depends on it.
+
+  @retval EFI_SUCCESS   The constructor always returns success.
+
+**/
+EFI_STATUS
+EFIAPI
+BaseRiscV64CpuTimerLibConstructor (
+  VOID
+  )
+{
+  GetPerformanceCounterProperties (NULL, NULL);
+
+  return EFI_SUCCESS;
+}