1 files changed, 49 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/core/idle.c b/contrib/syslinux-4.02/core/idle.c
new file mode 100644
index 0000000..3f57393
--- /dev/null
+++ b/contrib/syslinux-4.02/core/idle.c
@@ -0,0 +1,49 @@
+/* -*- fundamental -*- ---------------------------------------------------
+ *
+ *   Copyright 2008 H. Peter Anvin - All Rights Reserved
+ *   Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ *   Boston MA 02110-1301, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * idle.c:
+ *
+ * This function provided protected-mode access to the idle handling.
+ * It needs to be carefully coordinated with idle.inc, which provides
+ * idle services to real-mode code.
+ */
+
+#include "core.h"
+#include <sys/cpu.h>
+
+#define TICKS_TO_IDLE	4	/* Also in idle.inc */
+
+extern uint32_t _IdleTimer;
+extern uint16_t NoHalt;
+
+int (*idle_hook_func)(void);
+
+void reset_idle(void)
+{
+    _IdleTimer = jiffies();
+}
+
+void __idle(void)
+{
+    if (jiffies() - _IdleTimer < TICKS_TO_IDLE)
+	return;
+
+    if (idle_hook_func && idle_hook_func())
+	return;			/* Nonzero return = do not idle */
+
+    if (NoHalt)
+	cpu_relax();
+    else
+	hlt();
+}