Add support for OpenRISC - Fixed issues

This work is based on the old or32 port (that has been
removed back in 2005) authored by Chris Ziomkowski. The patch includes the
basic functions every port should implement like: context switch, exception
handling, OpenRISC ABI and machine definitions and configurations.

1 files changed, 43 insertions, 0 deletions

diff --git a/cpukit/score/cpu/or1k/or1k-context-initialize.c b/cpukit/score/cpu/or1k/or1k-context-initialize.c
new file mode 100644
index 0000000000..7ac2875ce7
--- /dev/null
+++ b/cpukit/score/cpu/or1k/or1k-context-initialize.c
@@ -0,0 +1,43 @@
+/*
+ * COPYRIGHT (c) 2014 Hesham ALMatary <heshamelmatary@gmail.com>
+ *
+ * COPYRIGHT (c) 1989-2006
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifdef HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <string.h>
+
+#include <rtems/score/cpu.h>
+#include <rtems/score/interr.h>
+#include <rtems/score/or1k-utility.h>
+
+void _CPU_Context_Initialize(
+  Context_Control *context,
+  void *stack_area_begin,
+  size_t stack_area_size,
+  uint32_t new_level,
+  void (*entry_point)( void ),
+  bool is_fp,
+  void *tls_area
+)
+{
+  uint32_t stack = (uint32_t) stack_area_begin;
+  uint32_t sr;
+
+  sr = _OR1K_mfspr(CPU_OR1K_SPR_SR);
+
+  memset(context, 0, sizeof(*context));
+
+  context->r1 = stack;
+  context->r2 = stack;
+  context->r9 = (uint32_t) entry_point;
+  context->sr = sr;
+}