ChibiOS 2.6.8, until I can figure out where to get it from git.

firmware/chibios/os/ports/GCC/ARM/AT91SAM7/wfi.h

@@ -0,0 +1,43 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+                 2011,2012,2013 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT 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; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+                                      ---
+
+    A special exception to the GPL can be applied should you wish to distribute
+    a combined work that includes ChibiOS/RT, without being obliged to provide
+    the source code for any proprietary components. See the file exception.txt
+    for full details of how and when the exception can be applied.
+*/
+
+#ifndef _WFI_H_
+#define _WFI_H_
+
+#include "board.h"
+
+#ifndef port_wait_for_interrupt
+#if ENABLE_WFI_IDLE != 0
+#define port_wait_for_interrupt() {                                     \
+  AT91C_BASE_SYS->PMC_SCDR = AT91C_PMC_PCK;                             \
+}
+#else
+#define port_wait_for_interrupt()
+#endif
+#endif
+
+#endif /* _WFI_H_ */