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Add multi-smi detection to CheckTimerSTS

This commit is contained in:
Eugene D Myers 2020-04-29 17:24:25 -04:00
parent c14928cb03
commit 218beee77d
1 changed files with 30 additions and 5 deletions
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35
Stm/StmPkg/Core/Runtime/PePciHandler.c
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@ -202,6 +202,17 @@ void StopSwTimer(void)
IoWrite32(pmbase + SMI_EN, smi_en);
}
/*
* CheckTimerSTS
* Input:
* Index - cpu number
*
* Output:
* 0 - No timer interrupt detected
* 1 - Timer interrupt detected
* 2 - Timer interrupt plus additional SMI
*/
int CheckTimerSTS(UINT32 Index)
{
UINT16 pmbase = get_pmbase();
@ -211,11 +222,25 @@ int CheckTimerSTS(UINT32 Index)
#endif
if((smi_sts & PERIODIC_STS) == PERIODIC_STS)
{
DEBUG((EFI_D_INFO,
"%ld CheckTimerSTS - Timer Interrupt Detected\n",
Index,
smi_sts));
return 1;
UINT32 smi_en = IoRead32(pmbase + SMI_EN);
UINT32 other_smi = (smi_en & smi_sts) & ~PERIODIC_STS;
if(other_smi == 0)
{
DEBUG((EFI_D_INFO,
"%ld CheckTimerSTS - Timer Interrupt Detected\n",
Index,
smi_sts));
return 1;
}
else
{
DEBUG((EFI_D_INFO,
"%ld CheckTimerSTS - Timer + other SMI found\n",
Index,
smi_sts));
return 2;
}
}
else
{