typedef struct _RTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME_EXTENDED
{
    ULONG Size;
    ULONG Format;
    RTL_ACTIVATION_CONTEXT_STACK_FRAME Frame;
    PVOID Extra1;
    PVOID Extra2;
    PVOID Extra3;
    PVOID Extra4;
} RTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME_EXTENDED,
  *PRTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME_EXTENDED;

typedef RTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME_EXTENDED *PRTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME

NTSYSAPI
VOID
FASTCALL
RtlActivateActivationContextUnsafeFast(
    IN PRTL_CALLER_ALLOCATED_ACTIVATION_CONTEXT_STACK_FRAME Frame,
    IN PVOID ActivationContext
    );

thanks you