SourceLevelDebugPkg/DxeDebugAgent: Initialize Local APIC Timer

Now Debug Agent library uses Local APIC Timer to implement time-out mechanism.
For AP, its local APIC timer may not work. This fix is to initialize Local
APIC timer if it doesn't work as expected when debugging AP function.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17604 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 10 insertions, 0 deletions

diff --git a/SourceLevelDebugPkg/Library/DebugAgent/DxeDebugAgent/DxeDebugAgentLib.c b/SourceLevelDebugPkg/Library/DebugAgent/DxeDebugAgent/DxeDebugAgentLib.c
index 56a5e1a170..f7fbb3ccfa 100644
--- a/SourceLevelDebugPkg/Library/DebugAgent/DxeDebugAgent/DxeDebugAgentLib.c
+++ b/SourceLevelDebugPkg/Library/DebugAgent/DxeDebugAgent/DxeDebugAgentLib.c
@@ -365,9 +365,19 @@ InitializeDebugAgent (
   IA32_DESCRIPTOR              IdtDescriptor;

   IA32_DESCRIPTOR              *Ia32Idtr;

   IA32_IDT_ENTRY               *Ia32IdtEntry;

+  BOOLEAN                      PeriodicMode;

+  UINTN                        TimerCycle;

 

   if (InitFlag == DEBUG_AGENT_INIT_DXE_AP) {

     //

+    // Check if CPU APIC Timer is working, otherwise initialize it.

+    //

+    GetApicTimerState (NULL, &PeriodicMode, NULL);

+    TimerCycle = GetApicTimerInitCount ();

+    if (!PeriodicMode || TimerCycle == 0) {

+      InitializeDebugTimer (NULL, FALSE);

+    }

+    //

     // Invoked by AP, enable interrupt to let AP could receive IPI from other processors

     //

     EnableInterrupts ();