diff --git a/source/memory_mapping.cpp b/source/memory_mapping.cpp
index 4c2aadf..efab512 100644
--- a/source/memory_mapping.cpp
+++ b/source/memory_mapping.cpp
@@ -433,6 +433,25 @@ void MemoryMapping_free(void *ptr) {
     }
 }
 
+uint32_t MemoryMapping_MEMGetAllocatableSize() {
+    return MemoryMapping_MEMGetAllocatableSizeEx(4);
+}
+
+uint32_t MemoryMapping_MEMGetAllocatableSizeEx(uint32_t align) {
+    uint32_t res = 0;
+    for (int32_t i = 0; /* waiting for a break */; i++) {
+        if (mem_mapping[i].physical_addresses == NULL) {
+            break;
+        }
+        uint32_t curRes = MEMGetAllocatableSizeForExpHeapEx((MEMHeapHandle) mem_mapping[i].effective_start_address, align);
+        DEBUG_FUNCTION_LINE("heap at %08X MEMGetAllocatableSizeForExpHeapEx: %d KiB", mem_mapping[i].effective_start_address, curRes / 1024);
+        if (curRes > res) {
+            res = curRes;
+        }
+    }
+    return res;
+}
+
 uint32_t MemoryMapping_GetFreeSpace() {
     uint32_t res = 0;
     for (int32_t i = 0; /* waiting for a break */; i++) {
diff --git a/source/memory_mapping.h b/source/memory_mapping.h
index c5172f5..72d8b15 100644
--- a/source/memory_mapping.h
+++ b/source/memory_mapping.h
@@ -160,10 +160,14 @@ const memory_values_t mem_vals_heap[] = {
         // overridden.
         // {0x28000000 + 0x00000000, 0x28000000 + 0x0A000000},              //
 
-        {0,                       0}
+        {0, 0}
 };
 
 
+uint32_t MemoryMapping_MEMGetAllocatableSize();
+
+uint32_t MemoryMapping_MEMGetAllocatableSizeEx(uint32_t align);
+
 bool MemoryMapping_isMemoryMapped();
 
 void MemoryMapping_setupMemoryMapping();