Headers: move arch_*.h to urcu/arch/*.h

[urcu.git] / urcu / arch / generic.h

diff --git a/urcu/arch/generic.h b/urcu/arch/generic.h
new file mode 100644 (file)
index 0000000..100d3c6
--- /dev/null
+++ b/urcu/arch/generic.h
@@ -0,0 +1,128 @@
+#ifndef _URCU_ARCH_GENERIC_H
+#define _URCU_ARCH_GENERIC_H
+
+/*
+ * arch_generic.h: common definitions for multiple architectures.
+ *
+ * Copyright (c) 2010 Paolo Bonzini <pbonzini@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <urcu/compiler.h>
+#include <urcu/config.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef CAA_CACHE_LINE_SIZE
+#define CAA_CACHE_LINE_SIZE    64
+#endif
+
+#if !defined(cmm_mc) && !defined(cmm_rmc) && !defined(cmm_wmc)
+#define CONFIG_HAVE_MEM_COHERENCY
+/*
+ * Architectures with cache coherency must _not_ define cmm_mc/cmm_rmc/cmm_wmc.
+ *
+ * For them, cmm_mc/cmm_rmc/cmm_wmc are implemented with a * simple compiler barrier;
+ * in addition, we provide defaults for cmm_mb (using GCC builtins) as well as
+ * cmm_rmb and cmm_wmb (defaulting to cmm_mb).
+ */
+
+#ifndef cmm_mb
+#define cmm_mb()    __sync_synchronize()
+#endif
+
+#ifndef cmm_rmb
+#define cmm_rmb()      cmm_mb()
+#endif
+
+#ifndef cmm_wmb
+#define cmm_wmb()      cmm_mb()
+#endif
+
+#define cmm_mc()       cmm_barrier()
+#define cmm_rmc()      cmm_barrier()
+#define cmm_wmc()      cmm_barrier()
+#else
+/*
+ * Architectures without cache coherency need something like the following:
+ *
+ * #define cmm_mc()            arch_cache_flush() 
+ * #define cmm_rmc()   arch_cache_flush_read()
+ * #define cmm_wmc()   arch_cache_flush_write()
+ *
+ * Of these, only cmm_mc is mandatory.  cmm_rmc and cmm_wmc default to cmm_mc.  
+ * cmm_mb/cmm_rmb/cmm_wmb use these definitions by default:
+ *
+ * #define cmm_mb()            cmm_mc()
+ * #define cmm_rmb()   cmm_rmc()
+ * #define cmm_wmb()   cmm_wmc()
+ */
+
+#ifndef cmm_mb
+#define cmm_mb()       cmm_mc()
+#endif
+
+#ifndef cmm_rmb
+#define cmm_rmb()      cmm_rmc()
+#endif
+
+#ifndef cmm_wmb
+#define cmm_wmb()      cmm_wmc()
+#endif
+
+#ifndef cmm_rmc
+#define cmm_rmc()      cmm_mc()
+#endif
+
+#ifndef cmm_wmc
+#define cmm_wmc()      cmm_mc()
+#endif
+#endif
+
+/* Nop everywhere except on alpha. */
+#ifndef cmm_read_barrier_depends
+#define cmm_read_barrier_depends()
+#endif
+
+#ifdef CONFIG_RCU_SMP
+#define cmm_smp_mb()   cmm_mb()
+#define cmm_smp_rmb()  cmm_rmb()
+#define cmm_smp_wmb()  cmm_wmb()
+#define cmm_smp_mc()   cmm_mc()
+#define cmm_smp_rmc()  cmm_rmc()
+#define cmm_smp_wmc()  cmm_wmc()
+#define cmm_smp_read_barrier_depends() cmm_read_barrier_depends()
+#else
+#define cmm_smp_mb()   cmm_barrier()
+#define cmm_smp_rmb()  cmm_barrier()
+#define cmm_smp_wmb()  cmm_barrier()
+#define cmm_smp_mc()   cmm_barrier()
+#define cmm_smp_rmc()  cmm_barrier()
+#define cmm_smp_wmc()  cmm_barrier()
+#define cmm_smp_read_barrier_depends()
+#endif
+
+#ifndef caa_cpu_relax
+#define caa_cpu_relax()                cmm_barrier()
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _URCU_ARCH_GENERIC_H */