From 13e0bc720bc9baadf0adc007f0035c180888b1f1 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Thu, 17 Apr 2014 07:04:05 -0400
Subject: [PATCH] Add support for hppa/PA-RISC architecture

Add the missing architecture specific functions to provide support for
the hppa/PA-RISC architecture:
- the processor internal time stamp counter (Control Register CR16) is
  used to get high-performance/low-latency cycle counts
- gcc provides the necessary built-in atomic functions on hppa (which in
  turn uses the light-weigth atomic locking syscall-interface of the
  Linux kernel)

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 configure.ac        |  1 +
 urcu/arch/hppa.h    | 30 ++++++++++++++++++++++++++++++
 urcu/uatomic/hppa.h | 10 ++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 urcu/arch/hppa.h
 create mode 100644 urcu/uatomic/hppa.h

diff --git a/configure.ac b/configure.ac
index 86f0e2b..008336c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,6 +82,7 @@ AS_CASE([$host_cpu],
 	[aarch64], [ARCHTYPE="gcc"],
 	[mips*], [ARCHTYPE="mips"],
 	[tile*], [ARCHTYPE="gcc"],
+	[hppa*], [ARCHTYPE="hppa"],
 	[ARCHTYPE="unknown"]
 )
 
diff --git a/urcu/arch/hppa.h b/urcu/arch/hppa.h
new file mode 100644
index 0000000..b9b9494
--- /dev/null
+++ b/urcu/arch/hppa.h
@@ -0,0 +1,30 @@
+#ifndef _URCU_ARCH_HPPA_H
+#define _URCU_ARCH_HPPA_H
+
+#include <urcu/compiler.h>
+#include <urcu/config.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+#include <sys/time.h>
+
+typedef unsigned long cycles_t;
+
+static inline cycles_t caa_get_cycles(void)
+{
+	cycles_t cycles;
+
+	asm volatile("mfctl 16, %0" : "=r" (cycles));
+	return cycles;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <urcu/arch/generic.h>
+
+#endif /* _URCU_ARCH_HPPA_H */
diff --git a/urcu/uatomic/hppa.h b/urcu/uatomic/hppa.h
new file mode 100644
index 0000000..2102153
--- /dev/null
+++ b/urcu/uatomic/hppa.h
@@ -0,0 +1,10 @@
+#ifndef _URCU_ARCH_UATOMIC_HPPA_H
+#define _URCU_ARCH_UATOMIC_HPPA_H
+
+#include <urcu/compiler.h>
+#include <urcu/system.h>
+
+#define UATOMIC_HAS_ATOMIC_SHORT
+#include <urcu/uatomic/generic.h>
+
+#endif /* _URCU_ARCH_UATOMIC_HPPA_H */
-- 
2.34.1