memory: add memory_region_is_rom()

Signed-off-by: NAvi Kivity <avi@redhat.com>

memory.c

@@ -1074,6 +1074,11 @@ bool memory_region_is_ram(MemoryRegion *mr)
     return mr->ram;
 }
 
+bool memory_region_is_rom(MemoryRegion *mr)
+{
+    return mr->ram && mr->readonly;
+}
+
 void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset)
 {
     mr->offset = offset;

memory.h

@@ -276,6 +276,15 @@ uint64_t memory_region_size(MemoryRegion *mr);
  */
 bool memory_region_is_ram(MemoryRegion *mr);
 
+/**
+ * memory_region_is_rom: check whether a memory region is ROM
+ *
+ * Returns %true is a memory region is read-only memory.
+ *
+ * @mr: the memory region being queried
+ */
+bool memory_region_is_rom(MemoryRegion *mr);
+
 /**
  * memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
  *