Cc: alexey_ishchuk@ru.ibm.com
Subject: DAPL support for Linux on System z

s390: Add support for Linux on System z

This patch adds the required code to support Linux on System z.


---
 dapl/udapl/linux/dapl_osd.h |   35 ++++++++++++++++++++++++++++++++++-
 dat/common/dat_strerror.c   |    4 ++++
 2 files changed, 38 insertions(+), 1 deletion(-)

Index: dapl-2.0.39/dapl/udapl/linux/dapl_osd.h
===================================================================
--- dapl-2.0.39.orig/dapl/udapl/linux/dapl_osd.h	2013-10-02 00:42:16.000000000 +0200
+++ dapl-2.0.39/dapl/udapl/linux/dapl_osd.h	2014-01-21 18:07:26.226177293 +0100
@@ -49,7 +49,7 @@
 #error UNDEFINED OS TYPE
 #endif /* __linux__ */
 
-#if !defined (__i386__) && !defined (__ia64__) && !defined(__x86_64__) && !defined(__PPC__) && !defined(__PPC64__)
+#if !defined (__i386__) && !defined (__ia64__) && !defined(__x86_64__) && !defined(__PPC__) && !defined(__PPC64__) && !defined(__s390x__)
 #error UNDEFINED ARCH
 #endif
 
@@ -156,6 +156,22 @@ int dapl_os_get_env_val (
 
 
 /* atomic functions */
+#ifdef __s390x__
+#define DAPL_CS_ADD(ptr, op_val) ({		\
+	int old_val, new_val;				\
+	__asm__ __volatile__(				\
+		"	l	%0,%2\n"		\
+		"0:	lr	%1,%0\n"		\
+		"	ar	%1,%3\n"		\
+		"	cs	%0,%1,%2\n"		\
+		"	jl	0b"			\
+		: "=&d" (old_val), "=&d" (new_val),	\
+		  "=Q" (*ptr)				\
+		: "d" (op_val), "Q" (*ptr)		\
+		: "cc", "memory");			\
+	new_val;					\
+})
+#endif
 
 /* dapl_os_atomic_inc
  *
@@ -179,6 +195,11 @@ dapl_os_atomic_inc (
 #else
 	IA64_FETCHADD(old_value,v,1,4);
 #endif
+#elif defined(__s390x__)
+	DAT_COUNT	tmp;
+	DAT_COUNT	delta = 1;
+
+	tmp = DAPL_CS_ADD(v, delta);
 #elif defined(__PPC__) || defined(__PPC64__)
 	int tmp;
 
@@ -218,6 +239,11 @@ dapl_os_atomic_dec (
 #else
 	IA64_FETCHADD(old_value,v,-1,4);
 #endif
+#elif defined(__s390x__)
+	DAT_COUNT	tmp;
+	DAT_COUNT	delta = -1;
+
+	tmp = DAPL_CS_ADD(v, delta);
 #elif defined (__PPC__) || defined(__PPC64__)
 	int tmp;
 
@@ -273,6 +299,13 @@ dapl_os_atomic_assign (
 #else
     current_value = ia64_cmpxchg(acq,v,match_value,new_value,4);
 #endif /* __ia64__ */
+#elif defined(__s390x__)
+	__asm__ __volatile__(
+		"	cs	%0,%2,%1\n"
+		: "+d" (match_value), "=Q" (*v)
+		: "d" (new_value), "Q" (*v)
+		: "cc", "memory");
+	current_value = match_value;
 #elif defined(__PPC__) || defined(__PPC64__)
         __asm__ __volatile__ (
 "       lwsync\n\
Index: dapl-2.0.39/dat/common/dat_strerror.c
===================================================================
--- dapl-2.0.39.orig/dat/common/dat_strerror.c	2014-01-21 18:07:26.206177756 +0100
+++ dapl-2.0.39/dat/common/dat_strerror.c	2014-01-21 18:07:26.226177293 +0100
@@ -47,6 +47,10 @@
 #include <dat2/udat.h>
 #endif				/* __UDAPL__ */
 
+#ifndef NULL
+#define NULL ((void *) 0)
+#endif
+
 /*********************************************************************
  *                                                                   *
  * Internal Function Declarations                                    *