diff options
Diffstat (limited to 'MdeModulePkg/Core/PiSmmCore/Smi.c')
| -rw-r--r-- | MdeModulePkg/Core/PiSmmCore/Smi.c | 164 |
1 files changed, 138 insertions, 26 deletions
diff --git a/MdeModulePkg/Core/PiSmmCore/Smi.c b/MdeModulePkg/Core/PiSmmCore/Smi.c index 2985f989c3..a84a1f48d3 100644 --- a/MdeModulePkg/Core/PiSmmCore/Smi.c +++ b/MdeModulePkg/Core/PiSmmCore/Smi.c @@ -8,6 +8,11 @@ #include "PiSmmCore.h"
+//
+// mSmiManageCallingDepth is used to track the depth of recursive calls of SmiManage.
+//
+UINTN mSmiManageCallingDepth = 0;
+
LIST_ENTRY mSmiEntryList = INITIALIZE_LIST_HEAD_VARIABLE (mSmiEntryList);
SMI_ENTRY mRootSmiEntry = {
@@ -80,6 +85,40 @@ SmmCoreFindSmiEntry ( }
/**
+ Remove SmiHandler and free the memory it used.
+ If SmiEntry is empty, remove SmiEntry and free the memory it used.
+
+ @param SmiHandler Points to SMI handler.
+ @param SmiEntry Points to SMI Entry or NULL for root SMI handlers.
+
+ @retval TRUE SmiEntry is removed.
+ @retval FALSE SmiEntry is not removed.
+**/
+BOOLEAN
+RemoveSmiHandler (
+ IN SMI_HANDLER *SmiHandler,
+ IN SMI_ENTRY *SmiEntry
+ )
+{
+ ASSERT (SmiHandler->ToRemove);
+ RemoveEntryList (&SmiHandler->Link);
+ FreePool (SmiHandler);
+
+ //
+ // Remove the SMI_ENTRY if all handlers have been removed.
+ //
+ if (SmiEntry != NULL) {
+ if (IsListEmpty (&SmiEntry->SmiHandlers)) {
+ RemoveEntryList (&SmiEntry->AllEntries);
+ FreePool (SmiEntry);
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+
+/**
Manage SMI of a particular type.
@param HandlerType Points to the handler type or NULL for root SMI handlers.
@@ -104,15 +143,17 @@ SmiManage ( {
LIST_ENTRY *Link;
LIST_ENTRY *Head;
+ LIST_ENTRY *EntryLink;
SMI_ENTRY *SmiEntry;
SMI_HANDLER *SmiHandler;
- BOOLEAN SuccessReturn;
+ EFI_STATUS ReturnStatus;
+ BOOLEAN WillReturn;
EFI_STATUS Status;
PERF_FUNCTION_BEGIN ();
-
- Status = EFI_NOT_FOUND;
- SuccessReturn = FALSE;
+ mSmiManageCallingDepth++;
+ Status = EFI_NOT_FOUND;
+ ReturnStatus = Status;
if (HandlerType == NULL) {
//
// Root SMI handler
@@ -152,7 +193,16 @@ SmiManage ( //
if (HandlerType != NULL) {
PERF_FUNCTION_END ();
- return EFI_INTERRUPT_PENDING;
+ ReturnStatus = EFI_INTERRUPT_PENDING;
+ WillReturn = TRUE;
+ } else {
+ //
+ // If any other handler's result sets ReturnStatus as EFI_SUCCESS, the return status
+ // will be EFI_SUCCESS.
+ //
+ if (ReturnStatus != EFI_SUCCESS) {
+ ReturnStatus = Status;
+ }
}
break;
@@ -165,10 +215,10 @@ SmiManage ( //
if (HandlerType != NULL) {
PERF_FUNCTION_END ();
- return EFI_SUCCESS;
+ WillReturn = TRUE;
}
- SuccessReturn = TRUE;
+ ReturnStatus = EFI_SUCCESS;
break;
case EFI_WARN_INTERRUPT_SOURCE_QUIESCED:
@@ -176,7 +226,7 @@ SmiManage ( // If at least one of the handlers returns EFI_WARN_INTERRUPT_SOURCE_QUIESCED
// then the function will return EFI_SUCCESS.
//
- SuccessReturn = TRUE;
+ ReturnStatus = EFI_SUCCESS;
break;
case EFI_WARN_INTERRUPT_SOURCE_PENDING:
@@ -184,6 +234,10 @@ SmiManage ( // If all the handlers returned EFI_WARN_INTERRUPT_SOURCE_PENDING
// then EFI_WARN_INTERRUPT_SOURCE_PENDING will be returned.
//
+ if (ReturnStatus != EFI_SUCCESS) {
+ ReturnStatus = Status;
+ }
+
break;
default:
@@ -193,14 +247,74 @@ SmiManage ( ASSERT (FALSE);
break;
}
+
+ if (WillReturn) {
+ break;
+ }
}
- if (SuccessReturn) {
- Status = EFI_SUCCESS;
+ ASSERT (mSmiManageCallingDepth > 0);
+ mSmiManageCallingDepth--;
+
+ //
+ // SmiHandlerUnRegister() calls from SMI handlers are deferred till this point.
+ // Before returned from SmiManage, delete the SmiHandler which is
+ // marked as ToRemove.
+ // Note that SmiManage can be called recursively.
+ //
+ if (mSmiManageCallingDepth == 0) {
+ //
+ // Go through all SmiHandler in root SMI handlers
+ //
+ for ( Link = GetFirstNode (&mRootSmiEntry.SmiHandlers)
+ ; !IsNull (&mRootSmiEntry.SmiHandlers, Link);
+ )
+ {
+ //
+ // SmiHandler might be removed in below, so cache the next link in Link
+ //
+ SmiHandler = CR (Link, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);
+ Link = GetNextNode (&mRootSmiEntry.SmiHandlers, Link);
+ if (SmiHandler->ToRemove) {
+ //
+ // Remove SmiHandler if the ToRemove is set.
+ //
+ RemoveSmiHandler (SmiHandler, NULL);
+ }
+ }
+
+ //
+ // Go through all SmiHandler in non-root SMI handlers
+ //
+ for ( EntryLink = GetFirstNode (&mSmiEntryList)
+ ; !IsNull (&mSmiEntryList, EntryLink);
+ )
+ {
+ //
+ // SmiEntry might be removed in below, so cache the next link in EntryLink
+ //
+ SmiEntry = CR (EntryLink, SMI_ENTRY, AllEntries, SMI_ENTRY_SIGNATURE);
+ EntryLink = GetNextNode (&mSmiEntryList, EntryLink);
+ for ( Link = GetFirstNode (&SmiEntry->SmiHandlers)
+ ; !IsNull (&SmiEntry->SmiHandlers, Link);
+ )
+ {
+ //
+ // SmiHandler might be removed in below, so cache the next link in Link
+ //
+ SmiHandler = CR (Link, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);
+ Link = GetNextNode (&SmiEntry->SmiHandlers, Link);
+ if (SmiHandler->ToRemove) {
+ if (RemoveSmiHandler (SmiHandler, SmiEntry)) {
+ break;
+ }
+ }
+ }
+ }
}
PERF_FUNCTION_END ();
- return Status;
+ return ReturnStatus;
}
/**
@@ -238,6 +352,7 @@ SmiHandlerRegister ( SmiHandler->Signature = SMI_HANDLER_SIGNATURE;
SmiHandler->Handler = Handler;
SmiHandler->CallerAddr = (UINTN)RETURN_ADDRESS (0);
+ SmiHandler->ToRemove = FALSE;
if (HandlerType == NULL) {
//
@@ -318,30 +433,27 @@ SmiHandlerUnRegister ( }
}
- if ((EFI_HANDLE)SmiHandler != DispatchHandle) {
+ if (SmiHandler == NULL) {
return EFI_INVALID_PARAMETER;
}
- SmiEntry = SmiHandler->SmiEntry;
-
- RemoveEntryList (&SmiHandler->Link);
- FreePool (SmiHandler);
+ ASSERT ((EFI_HANDLE)SmiHandler == DispatchHandle);
+ SmiHandler->ToRemove = TRUE;
- if (SmiEntry == NULL) {
+ if (mSmiManageCallingDepth > 0) {
//
- // This is root SMI handler
+ // This function is called from SmiManage()
+ // Do not delete or remove SmiHandler or SmiEntry now.
+ // SmiManage will handle it later
//
return EFI_SUCCESS;
}
- if (IsListEmpty (&SmiEntry->SmiHandlers)) {
- //
- // No handler registered for this interrupt now, remove the SMI_ENTRY
- //
- RemoveEntryList (&SmiEntry->AllEntries);
-
- FreePool (SmiEntry);
- }
+ SmiEntry = SmiHandler->SmiEntry;
+ //
+ // For root SMI handler, use NULL for SmiEntry
+ //
+ RemoveSmiHandler (SmiHandler, (SmiEntry == &mRootSmiEntry) ? NULL : SmiEntry);
return EFI_SUCCESS;
}
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