1 files changed, 1 insertions, 0 deletions
diff --git a/cpu-all.h b/cpu-all.h
index 7876a470e6..3df0fb8a95 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -821,6 +821,7 @@ extern uint8_t *phys_ram_dirty;
    the physical address */
 #define IO_MEM_ROMD        (1)
 #define IO_MEM_SUBPAGE     (2)
+#define IO_MEM_SUBWIDTH    (4)
 
 typedef void CPUWriteMemoryFunc(void *opaque, target_phys_addr_t addr, uint32_t value);
 typedef uint32_t CPUReadMemoryFunc(void *opaque, target_phys_addr_t addr);