1 files changed, 1 insertions, 0 deletions
diff --git a/backend.h b/backend.h
index 97e2ae4..a228d13 100644
--- a/backend.h
+++ b/backend.h
@@ -79,6 +79,7 @@ typedef struct {
 #define MMAP_ONLY_ODD  0x10
 #define MMAP_ONLY_EVEN 0x20
 #define MMAP_FUNC_NULL 0x40
+#define MMAP_CUSTOM    0x80
 
 typedef uint16_t (*read_16_fun)(uint32_t address, void * context);
 typedef uint8_t (*read_8_fun)(uint32_t address, void * context);