From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Wed, 13 May 2009 18:03:52 +0000 (-0400)
Subject: add sync_core primitive
X-Git-Tag: v0.1~226
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=ebb22fff4a06b0661b55726ad332c4c53f6603fe;p=userspace-rcu.git

add sync_core primitive

Add sync_core() to serialize instruction execution on a core.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---

diff --git a/arch_ppc.h b/arch_ppc.h
index c68790f..9c4ec91 100644
--- a/arch_ppc.h
+++ b/arch_ppc.h
@@ -78,6 +78,14 @@ static inline void cpu_relax(void)
 	barrier();
 }
 
+/*
+ * Serialize core instruction execution. Also acts as a compiler barrier.
+ */
+static inline void sync_core()
+{
+	asm volatile("isync" : : : "memory");
+}
+
 #define mftbl()						\
 	({ 						\
 		unsigned long rval;			\
diff --git a/arch_x86.h b/arch_x86.h
index 4a2573e..e7d945e 100644
--- a/arch_x86.h
+++ b/arch_x86.h
@@ -94,6 +94,14 @@ static inline void cpu_relax(void)
 	rep_nop();
 }
 
+/*
+ * Serialize core instruction execution. Also acts as a compiler barrier.
+ */
+static inline void sync_core(void)
+{
+	asm volatile("cpuid" : : : "memory", "eax", "ebx", "ecx", "edx");
+}
+
 #define rdtscll(val)							  \
 	do {						  		  \
 	     unsigned int __a, __d;					  \