diff --git a/src/soc/intel/cannonlake/memmap.c b/src/soc/intel/cannonlake/memmap.c
index c14ccd712f..8cf74c5585 100644
--- a/src/soc/intel/cannonlake/memmap.c
+++ b/src/soc/intel/cannonlake/memmap.c
@@ -256,6 +256,21 @@ static uintptr_t calculate_dram_base(size_t *reserved_mem_size)
 	return dram_base;
 }
 
+/*
+ * SoC implementation
+ *
+ * SoC call to summarize all Intel Reserve MMIO size and report to SA
+ */
+size_t soc_reserved_mmio_size(void)
+{
+	size_t chipset_mem_size;
+
+	calculate_dram_base(&chipset_mem_size);
+
+	/* Get Intel Reserved Memory Range Size */
+	return chipset_mem_size;
+}
+
 /* Fill up memory layout information */
 void fill_soc_memmap_ebda(struct ebda_config *cfg)
 {