--- a/backend.c	Thu Jan 08 23:20:41 2015 -0800
+++ b/backend.c	Wed Jan 14 09:38:54 2015 -0800
@@ -72,3 +72,28 @@
 	}
 	return NULL;
 }
+
+uint32_t chunk_size(cpu_options *opts, memmap_chunk const *chunk)
+{
+	if (chunk->mask == opts->address_mask) {
+		return chunk->end - chunk->start;
+	} else {
+		return chunk->mask + 1;
+	}
+}
+
+uint32_t ram_size(cpu_options *opts)
+{
+	uint32_t size = 0;
+	for (int i = 0; i < opts->memmap_chunks; i++)
+	{
+		if ((opts->memmap[i].flags & (MMAP_WRITE | MMAP_CODE)) == (MMAP_WRITE | MMAP_CODE)) {
+			if (opts->memmap[i].mask == opts->address_mask) {
+				size += opts->memmap[i].end - opts->memmap[i].start;
+			} else {
+				size += opts->memmap[i].mask + 1;
+			}
+		}
+	}
+	return size;
+}