From: Michael Brown <mcb30@etherboot.org>
Date: Sat, 18 Aug 2007 17:04:50 +0000 (+0100)
Subject: Add barrier() primitive (was present in Eb5.4), used by some currently
X-Git-Tag: v0.9.3~71^2~84
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=800c8b014b53b220144e77e43080128c3e00ef16;p=thirdparty%2Fipxe.git

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 b130f28fd..2151fc6ac 100644
--- 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 */