diff options
| -rw-r--r-- | IntelFspWrapperPkg/Library/BaseFspApiLib/X64/DispatchExecute.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/IntelFspWrapperPkg/Library/BaseFspApiLib/X64/DispatchExecute.c b/IntelFspWrapperPkg/Library/BaseFspApiLib/X64/DispatchExecute.c index e2f4422534..360327ed08 100644 --- a/IntelFspWrapperPkg/Library/BaseFspApiLib/X64/DispatchExecute.c +++ b/IntelFspWrapperPkg/Library/BaseFspApiLib/X64/DispatchExecute.c @@ -89,6 +89,18 @@ Execute32BitCode ( IN UINT64 Param1
)
{
- return AsmExecute32BitCode (Function, Param1, 0, &mGdt);
+ EFI_STATUS Status;
+ IA32_DESCRIPTOR Idtr;
+
+ //
+ // Idtr might be changed inside of FSP. 32bit FSP only knows the <4G address.
+ // If IDTR.Base is >4G, FSP can not handle. So we need save/restore IDTR here for X64 only.
+ // Interrupt is already disabled here, so it is safety to update IDTR.
+ //
+ AsmReadIdtr (&Idtr);
+ Status = AsmExecute32BitCode (Function, Param1, 0, &mGdt);
+ AsmWriteIdtr (&Idtr);
+
+ return Status;
}
|