Add S390 architecture specific headers

[urcu.git] / arch_s390.h

diff --git a/arch_s390.h b/arch_s390.h
new file mode 100644 (file)
index 0000000..72af7e3
--- /dev/null
+++ b/arch_s390.h
@@ -0,0 +1,70 @@
+#ifndef _ARCH_S390_H
+#define _ARCH_S390_H
+
+/*
+ * Trivial definitions for the S390 architecture.
+ *
+ * Copyright (C) 2009 Novell, Inc.
+ * Author: Jan Blunck <jblunck@suse.de>
+ *
+ * Based on the Principles of Operation "CPU Serialization" (5-91), "BRANCH ON
+ * CONDITION" (7-25) and "STORE CLOCK" (7-169).
+ *
+ * Inspired by arch_ppc.h which is:
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free  Software Foundation.
+ */
+
+#include <compiler.h>
+#include <arch_atomic.h>
+
+#define CONFIG_HAVE_MEM_COHERENCY
+/* Assume SMP machine, given we don't have this information */
+#define CONFIG_SMP 1
+
+#ifndef BITS_PER_LONG
+#define BITS_PER_LONG  (__SIZEOF_LONG__ * 8)
+#endif
+
+#define mb()    __asm__ __volatile__("bcr 15,0" : : : "memory")
+#define rmb()   __asm__ __volatile__("bcr 15,0" : : : "memory");
+#define wmb()   __asm__ __volatile__("bcr 15,0" : : : "memory");
+#define mc()   barrier()
+#define rmc()  barrier()
+#define wmc()  barrier()
+
+#define smp_mb()       mb()
+#define smp_rmb()      rmb()
+#define smp_wmb()      wmb()
+#define smp_mc()       mc()
+#define smp_rmc()      rmc()
+#define smp_wmc()      wmc()
+
+/* Nop everywhere except on alpha. */
+#define smp_read_barrier_depends()
+
+static inline void cpu_relax(void)
+{
+       barrier();
+}
+
+static inline void sync_core()
+{
+       __asm__ __volatile__("bcr 15,0" : : : "memory");
+}
+
+typedef unsigned long long cycles_t;
+
+static inline cycles_t get_cycles (void)
+{
+       cycles_t cycles;
+
+       __asm__ __volatile__("stck %0" : "=m" (cycles) : : "cc", "memory" );
+
+       return cycles;
+}
+
+#endif /* _ARCH_S390_H */