Add barrier() primitive (was present in Eb5.4), used by some currently

out-of-tree driver code.

diff --git a/src/include/compiler.h b/src/include/compiler.h
index b130f28fd692daefaef0667aa2cbaccc82703d23..2151fc6ac1a817f6fcc30e5c1e50df0451156251 100644 (file)
--- a/src/include/compiler.h
+++ b/src/include/compiler.h
@@ -311,6 +311,11 @@ extern void dbg_hex_dump_da ( unsigned long dispaddr,
  */
 #define __shared __asm__ ( "_shared_bss" )
 
+/**
+ * Optimisation barrier
+ */
+#define barrier() __asm__ __volatile__ ( "" : : : "memory" )
+
 #endif /* ASSEMBLY */
 
 #endif /* COMPILER_H */