In enter SMI, APIC timer may be initialized. After exit SMI, APIC timer
will be restore.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
---
 .../DebugAgent/SmmDebugAgent/SmmDebugAgentLib.c     | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgent/SmmDebugAgentLib.c b/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgent/SmmDebugAgentLib.c
index 11afd32..6be8c54 100644
--- a/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgent/SmmDebugAgentLib.c
+++ b/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgent/SmmDebugAgentLib.c
@@ -20,6 +20,11 @@ UINTN                       mSavedDebugRegisters[6];
 IA32_IDT_GATE_DESCRIPTOR    mIdtEntryTable[33];
 BOOLEAN                     mSkipBreakpoint = FALSE;
 BOOLEAN                     mSmmDebugIdtInitFlag = FALSE;
+BOOLEAN                     mApicTimerRestore = FALSE;
+BOOLEAN                     mPeriodicMode;
+UINT32                      mTimerCycle;
+UINTN                       mApicTimerDivisor;
+UINT8                       mVector;
 
 CHAR8 mWarningMsgIgnoreSmmEntryBreak[] = "Ignore smmentrybreak setting for SMI issued during DXE debugging!\r\n";
 
@@ -191,8 +196,6 @@ InitializeDebugAgent (
   DEBUG_AGENT_MAILBOX           *Mailbox;
   UINT64                        *MailboxLocation;
   UINT32                        DebugTimerFrequency;
-  BOOLEAN                       PeriodicMode;
-  UINTN                         TimerCycle;
 
   switch (InitFlag) {
   case DEBUG_AGENT_INIT_SMM:
@@ -289,9 +292,10 @@ InitializeDebugAgent (
     // Check if CPU APIC Timer is working, otherwise initialize it.
     //
     InitializeLocalApicSoftwareEnable (TRUE);
-    GetApicTimerState (NULL, &PeriodicMode, NULL);
-    TimerCycle = GetApicTimerInitCount ();
-    if (!PeriodicMode || TimerCycle == 0) {
+    GetApicTimerState (&mApicTimerDivisor, &mPeriodicMode, &mVector);
+    mTimerCycle = GetApicTimerInitCount ();
+    if (!mPeriodicMode || mTimerCycle == 0) {
+      mApicTimerRestore = TRUE;
       InitializeDebugTimer (NULL, FALSE);
     }
     Mailbox = GetMailboxPointer ();
@@ -327,6 +331,13 @@ InitializeDebugAgent (
     //
     mSkipBreakpoint = FALSE;
     RestoreDebugRegister ();
+    //
+    // Restore APIC Timer
+    //
+    if (mApicTimerRestore) {
+      InitializeApicTimer (mApicTimerDivisor, mTimerCycle, mPeriodicMode, mVector);
+      mApicTimerRestore = FALSE;
+    }
     break;
 
   case DEBUG_AGENT_INIT_THUNK_PEI_IA32TOX64:
-- 
2.8.0.windows.1

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Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

Thanks/Ray

> -----Original Message-----
> From: Gao, Liming
> Sent: Tuesday, October 10, 2017 6:04 PM
> To: edk2-devel@lists.01.org
> Cc: Ni, Ruiyu <ruiyu.ni@intel.com>
> Subject: [Patch] SourceLevelDebugPkg: Update SmmDebugAgentLib to
> restore APIC timer
> 
> In enter SMI, APIC timer may be initialized. After exit SMI, APIC timer will be
> restore.
> 
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Liming Gao <liming.gao@intel.com>
> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
> ---
>  .../DebugAgent/SmmDebugAgent/SmmDebugAgentLib.c     | 21
> ++++++++++++++++-----
>  1 file changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git
> a/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgent/SmmDebug
> AgentLib.c
> b/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgent/SmmDebu
> gAgentLib.c
> index 11afd32..6be8c54 100644
> ---
> a/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgent/SmmDebug
> AgentLib.c
> +++
> b/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgent/SmmDebu
> gAgent
> +++ Lib.c
> @@ -20,6 +20,11 @@ UINTN                       mSavedDebugRegisters[6];
>  IA32_IDT_GATE_DESCRIPTOR    mIdtEntryTable[33];
>  BOOLEAN                     mSkipBreakpoint = FALSE;
>  BOOLEAN                     mSmmDebugIdtInitFlag = FALSE;
> +BOOLEAN                     mApicTimerRestore = FALSE;
> +BOOLEAN                     mPeriodicMode;
> +UINT32                      mTimerCycle;
> +UINTN                       mApicTimerDivisor;
> +UINT8                       mVector;
> 
>  CHAR8 mWarningMsgIgnoreSmmEntryBreak[] = "Ignore smmentrybreak
> setting for SMI issued during DXE debugging!\r\n";
> 
> @@ -191,8 +196,6 @@ InitializeDebugAgent (
>    DEBUG_AGENT_MAILBOX           *Mailbox;
>    UINT64                        *MailboxLocation;
>    UINT32                        DebugTimerFrequency;
> -  BOOLEAN                       PeriodicMode;
> -  UINTN                         TimerCycle;
> 
>    switch (InitFlag) {
>    case DEBUG_AGENT_INIT_SMM:
> @@ -289,9 +292,10 @@ InitializeDebugAgent (
>      // Check if CPU APIC Timer is working, otherwise initialize it.
>      //
>      InitializeLocalApicSoftwareEnable (TRUE);
> -    GetApicTimerState (NULL, &PeriodicMode, NULL);
> -    TimerCycle = GetApicTimerInitCount ();
> -    if (!PeriodicMode || TimerCycle == 0) {
> +    GetApicTimerState (&mApicTimerDivisor, &mPeriodicMode, &mVector);
> +    mTimerCycle = GetApicTimerInitCount ();
> +    if (!mPeriodicMode || mTimerCycle == 0) {
> +      mApicTimerRestore = TRUE;
>        InitializeDebugTimer (NULL, FALSE);
>      }
>      Mailbox = GetMailboxPointer ();
> @@ -327,6 +331,13 @@ InitializeDebugAgent (
>      //
>      mSkipBreakpoint = FALSE;
>      RestoreDebugRegister ();
> +    //
> +    // Restore APIC Timer
> +    //
> +    if (mApicTimerRestore) {
> +      InitializeApicTimer (mApicTimerDivisor, mTimerCycle, mPeriodicMode,
> mVector);
> +      mApicTimerRestore = FALSE;
> +    }
>      break;
> 
>    case DEBUG_AGENT_INIT_THUNK_PEI_IA32TOX64:
> --
> 2.8.0.windows.1

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