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-rw-r--r--sys/sys/memrange.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/sys/memrange.h b/sys/sys/memrange.h
index 36e354df49c7..bd18f590b467 100644
--- a/sys/sys/memrange.h
+++ b/sys/sys/memrange.h
@@ -10,6 +10,7 @@
#define MDF_WRITETHROUGH (1<<2) /* write-through cached */
#define MDF_WRITEBACK (1<<3) /* write-back cached */
#define MDF_WRITEPROTECT (1<<4) /* read-only region */
+#define MDF_UNKNOWN (1<<5) /* any state we don't understand */
#define MDF_ATTRMASK (0x00ffffff)
#define MDF_FIXBASE (1<<24) /* fixed base */