#include <Protocol/Variable.h>\r
#include <Protocol/SmmCommunication.h>\r
#include <Protocol/SmmVariable.h>\r
+#include <Protocol/VariableLock.h>\r
\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/UefiRuntimeServicesTableLib.h>\r
UINTN mVariableBufferSize;\r
UINTN mVariableBufferPayloadSize;\r
EFI_LOCK mVariableServicesLock;\r
+EDKII_VARIABLE_LOCK_PROTOCOL mVariableLock;\r
\r
/**\r
Acquires lock only at boot time. Simply returns at runtime.\r
return SmmVariableFunctionHeader->ReturnStatus;\r
}\r
\r
+/**\r
+ Mark a variable that will become read-only after leaving the DXE phase of execution.\r
+\r
+ @param[in] This The VARIABLE_LOCK_PROTOCOL instance.\r
+ @param[in] VariableName A pointer to the variable name that will be made read-only subsequently.\r
+ @param[in] VendorGuid A pointer to the vendor GUID that will be made read-only subsequently.\r
+\r
+ @retval EFI_SUCCESS The variable specified by the VariableName and the VendorGuid was marked\r
+ as pending to be read-only.\r
+ @retval EFI_INVALID_PARAMETER VariableName or VendorGuid is NULL.\r
+ Or VariableName is an empty string.\r
+ @retval EFI_ACCESS_DENIED EFI_END_OF_DXE_EVENT_GROUP_GUID or EFI_EVENT_GROUP_READY_TO_BOOT has\r
+ already been signaled.\r
+ @retval EFI_OUT_OF_RESOURCES There is not enough resource to hold the lock request.\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VariableLockRequestToLock (\r
+ IN CONST EDKII_VARIABLE_LOCK_PROTOCOL *This,\r
+ IN CHAR16 *VariableName,\r
+ IN EFI_GUID *VendorGuid\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ UINTN PayloadSize;\r
+ SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE *VariableToLock;\r
+\r
+ if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r
+\r
+ //\r
+ // Init the communicate buffer. The buffer data size is:\r
+ // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r
+ //\r
+ PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE, Name) + StrSize (VariableName);\r
+ Status = InitCommunicateBuffer ((VOID **) &VariableToLock, PayloadSize, SMM_VARIABLE_FUNCTION_LOCK_VARIABLE);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+ ASSERT (VariableToLock != NULL);\r
+\r
+ CopyGuid (&VariableToLock->Guid, VendorGuid);\r
+ VariableToLock->NameSize = StrSize (VariableName);\r
+ CopyMem (VariableToLock->Name, VariableName, VariableToLock->NameSize);\r
+\r
+ //\r
+ // Send data to SMM.\r
+ //\r
+ Status = SendCommunicateBuffer (PayloadSize);\r
+\r
+Done:\r
+ ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r
+ return Status;\r
+}\r
\r
/**\r
This code finds variable in storage blocks (Volatile or Non-Volatile).\r
IN EFI_SYSTEM_TABLE *SystemTable\r
)\r
{\r
+ EFI_STATUS Status;\r
VOID *SmmVariableRegistration;\r
VOID *SmmVariableWriteRegistration;\r
EFI_EVENT OnReadyToBootEvent;\r
\r
EfiInitializeLock (&mVariableServicesLock, TPL_NOTIFY);\r
\r
+ mVariableLock.RequestToLock = VariableLockRequestToLock;\r
+ Status = gBS->InstallMultipleProtocolInterfaces (\r
+ &mHandle,\r
+ &gEdkiiVariableLockProtocolGuid,\r
+ &mVariableLock,\r
+ NULL\r
+ );\r
+ ASSERT_EFI_ERROR (Status);\r
+\r
//\r
// Smm variable service is ready\r
//\r