Changeset e2ec980f in mainline for arch/ia32/include/barrier.h

Timestamp:

2005-11-09T01:21:46Z (20 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

b183865e

Parents:

0b5ac364

Message:

ia64 work.
Big cleanup of IA-64 interrupt processing.
Merge of interrupt.c and interrupt_handler.c.
Rewrite of ivt.S and interrupt.c.
Higher level interrupt handlers are now passed a vector number and a pointer to stack structure.

ia32 work.
ia32 has ordered writes. Until it deploys weaker memory ordering model, write_barrier() can be empty statement.

File:

• arch/ia32/include/barrier.h (modified) (1 diff)

arch/ia32/include/barrier.h

@@ -56 +56 @@
 
 #ifdef CONFIG_FENCES_P4
-#       define memory_barrier() __asm__ volatile ("mfence\n" ::: "memory")
+#       define memory_barrier()         __asm__ volatile ("mfence\n" ::: "memory")
 #       define read_barrier()           __asm__ volatile ("lfence\n" ::: "memory")
-#       define write_barrier()          __asm__ volatile ("sfence\n" ::: "memory")
+#       ifdef CONFIG_WEAK_MEMORY
+#               define write_barrier()  __asm__ volatile ("sfence\n" ::: "memory")
+#       else
+#               define write_barrier()
+#       endif
 #elif CONFIG_FENCES_P3
 #       define memory_barrier()         cpuid_serialization()
 #       define read_barrier()           cpuid_serialization()
-#       define write_barrier()          __asm__ volatile ("sfence\n" ::: "memory")
+#       ifdef CONFIG_WEAK_MEMORY
+#               define write_barrier()  __asm__ volatile ("sfence\n" ::: "memory")
+#       else
+#               define write_barrier()
+#       endif
 #else
 #       define memory_barrier()         cpuid_serialization()
 #       define read_barrier()           cpuid_serialization()
-#       define write_barrier()          cpuid_serialization()
+#       ifdef CONFIG_WEAK_MEMORY
+#               define write_barrier()  cpuid_serialization()
+#       else
+#               define write_barrier()
+#       endif
 #endif