LGPLv2.1 relicensing

[urcu.git] / arch_x86.h

diff --git a/arch_x86.h b/arch_x86.h
index 99ccd298dce87faada641ddc11e017c97c8eeced..e924913ebc235d308ed088f1fe6fd455ba591a67 100644 (file)
--- a/arch_x86.h
+++ b/arch_x86.h
@@ -1,3 +1,6 @@
+#ifndef _ARCH_X86_H
+#define _ARCH_X86_H
+
 /*
  * arch_x86.h: Definitions for the x86 architecture, derived from Linux.
  *
@@ -18,6 +21,8 @@
  * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
  */
 
+#include <compiler.h>
+
 /* Assume P4 or newer */
 #define CONFIG_HAVE_FENCE 1
 #define CONFIG_HAVE_MEM_COHERENCY
@@ -51,6 +56,28 @@
 #define rmc()  barrier()
 #define wmc()  barrier()
 
+/* Assume SMP machine, given we don't have this information */
+#define CONFIG_SMP 1
+
+#ifdef CONFIG_SMP
+#define smp_mb()       mb()
+#define smp_rmb()      rmb()
+#define smp_wmb()      wmb()
+#define smp_mc()       mc()
+#define smp_rmc()      rmc()
+#define smp_wmc()      wmc()
+#else
+#define smp_mb()       barrier()
+#define smp_rmb()      barrier()
+#define smp_wmb()      barrier()
+#define smp_mc()       barrier()
+#define smp_rmc()      barrier()
+#define smp_wmc()      barrier()
+#endif
+
+/* Nop everywhere except on alpha. */
+#define smp_read_barrier_depends()
+
 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
 static inline void rep_nop(void)
 {
@@ -135,3 +162,5 @@ static inline cycles_t get_cycles (void)
         rdtscll(ret);
         return ret;
 }
+
+#endif /* _ARCH_X86_H */