Add in a simple API for memory barriers to machine/bus.h:

- barrier_read() enforces a memory read barrier
- barrier_write() enforces a memory write barrier
- barrier_rw() enforces a memory read/write barrier

1 files changed, 22 insertions, 0 deletions

diff --git a/sys/ia64/include/bus.h b/sys/ia64/include/bus.h
index c054193..9bb2f76 100644
--- a/sys/ia64/include/bus.h
+++ b/sys/ia64/include/bus.h
@@ -1023,6 +1023,28 @@ bus_space_barrier(bus_space_tag_t tag, bus_space_handle_t bsh,
 	ia64_mf();
 }
 
+/*
+ * Generic memory barrier functions.
+ */
+static __inline void
+barrier_read(void)
+{
+	bus_space_barrier(IA64_BUS_SPACE_MEM, 0, 0, ~0, BUS_SPACE_BARRIER_READ);
+}
+
+static __inline void
+barrier_write(void)
+{
+	bus_space_barrier(IA64_BUS_SPACE_MEM, 0, 0, ~0,
+	    BUS_SPACE_BARRIER_WRITE);
+}
+
+static __inline void
+barrier_rw(void)
+{
+	bus_space_barrier(IA64_BUS_SPACE_MEM, 0, 0, ~0,
+	    BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
+}
 
 /*
  * Flags used in various bus DMA methods.