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: v0.9.3~116^2~1
X-Git-Url: http://git.etherboot.org/people/andreif/gpxe.git/commitdiff_plain/a895fd0c15ed6213e6a2ef43e5bf1b1a3c335514?ds=sidebyside

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 b130f28f..2151fc6a 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 */