1 files changed, 84 insertions, 0 deletions
diff --git a/libgloss/sparc_leon/kernel_sched.c b/libgloss/sparc_leon/kernel_sched.c
new file mode 100644
index 000000000..2b485c0fe
--- /dev/null
+++ b/libgloss/sparc_leon/kernel_sched.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2011 Aeroflex Gaisler
+ *
+ * BSD license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+#include <asm-leon/contextswitch.h>
+#include <asm-leon/leonbare_kernel.h>
+#include <asm-leon/leonbare_debug.h>
+#include <asm-leon/stack.h>
+#include <asm-leon/leonstack.h>
+#include <asm-leon/irq.h>
+
+unsigned int
+reschedule ()
+{
+  leonbare_sched_update ();
+  return leonbare_sched ();
+}
+
+unsigned int
+leonbare_sched ()
+{
+  unsigned int ret = 0;
+  volatile leonbare_thread_t old = LEONBARE_KR_CURRENT, new =
+    LEONBARE_KR_NEXT;
+  LBDEBUG_FNCALL;
+  LBDEBUG_HEADER_PRINTF (LBDEBUG_SCHED_NR, "switch %s[%x]->%s[%x]\n",
+			 LEONBARE_TH_NAME_DBG (old), old,
+			 LEONBARE_TH_NAME_DBG (new), new);
+
+  LBPASSERT ((old != new),
+	     "leonbare_sched should only be called with reschedule work to do",
+	     0);
+
+  LEONBARE_KR_CURRENT = new;
+
+  /* to be able to programm symetrically on kernel level each thread
+     saves it's spinlock on mutexes and kernel and irq flags in its
+     own save region. On a kernel switch they are released until the
+     thread is reawakened. Then the locks will be reaquired (and finally
+     released when the codeblock exits). The locking can be recursive. */
+  if (old->th_prot.krp_k_depth)
+    {
+      LEONBARE_SMP_SPINLOCK_RELEASE (LEONBARE_KR_LOCK);
+    }
+  if (old->th_prot.krp_m_depth)
+    {
+      LEONBARE_SMP_SPINLOCK_RELEASE (old->th_prot.krp_m);
+    }
+
+  ret = _leonbare_kernel_switchto (old, new);
+  optbarrier ();
+
+  if (new->th_prot.krp_m_depth)
+    {
+      LEONBARE_SMP_SPINLOCK_AQUIRE (new->th_prot.krp_m);
+    }
+  if (old->th_prot.krp_k_depth)
+    {
+      LEONBARE_SMP_SPINLOCK_AQUIRE (LEONBARE_KR_LOCK);
+    }
+
+  return ret;
+}