Changeset b52da8d7 in mainline for arch/ia32/include/barrier.h

Timestamp:

2005-08-29T11:57:26Z (20 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

c245372b

Parents:

229d5fc1

Message:

Add some comments to IA-32 src/boot/boot.S and src/smp.S.

Make the boot stack start on page boundary.
This is required by get_stack_base().

Define 'THE' macro.

Implement preemption_disable() and preemption_enable().

Add memory barrier macros.
IA-32 macros need support for older processors.
Non IA-32 macros are dummy.

Reduction of many #include paths.

File:

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

arch/ia32/include/barrier.h

@@ -44 +44 @@
 #define CS_LEAVE_BARRIER()      __asm__ volatile ("" ::: "memory")
 
+#define memory_barrier()        __asm__ volatile ("mfence\n" ::: "memory")
+#define read_barrier()          __asm__ volatile ("sfence\n" ::: "memory")
+#define write_barrier()         __asm__ volatile ("lfence\n" ::: "memory")
+
 #endif